Games of Daze/Infomagic - Games of Daze (Summer 1995) (Disc 1 of 2).iso/djgpp/src/binutils.252/gas/ecoff.c

C/C++ Source or Header | 1994-10-22 | 144.8 KB | 5,221 lines

/* ECOFF debugging support.
   Copyright (C) 1993 Free Software Foundation, Inc.
   Contributed by Cygnus Support.
   This file was put together by Ian Lance Taylor <[e-mail]>.  A
   good deal of it comes directly from mips-tfile.c, by Michael
   Meissner <[e-mail]>.

   This file is part of GAS.

   GAS is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GAS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GAS; see the file COPYING.  If not, write to
   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "as.h"

/* This file is compiled conditionally for those targets which use
   ECOFF debugging information (e.g., MIPS ECOFF, MIPS ELF, Alpha
   ECOFF).  */

#ifdef ECOFF_DEBUGGING

#include "coff/internal.h"
#include "coff/symconst.h"
#include "ecoff.h"
#include "aout/stab_gnu.h"

#include <ctype.h>

/* Why isn't this in coff/sym.h?  */
#define ST_RFDESCAPE 0xfff

/* This file constructs the information used by the ECOFF debugging
   format.  It just builds a large block of data.

   We support both ECOFF style debugging and stabs debugging (the
   stabs symbols are encapsulated in ECOFF symbols).  This should let
   us handle anything the compiler might throw at us.  */

/* Here is a brief description of the MIPS ECOFF symbol table, by
   Michael Meissner.  The MIPS symbol table has the following pieces:

    Symbolic Header
        |
        +--    Auxiliary Symbols
        |
        +--    Dense number table
        |
        +--    Optimizer Symbols
        |
        +--    External Strings
        |
        +--    External Symbols
        |
        +--    Relative file descriptors
        |
        +--    File table
            |
            +--    Procedure table
            |
            +--    Line number table
            |
            +--    Local Strings
            |
            +--    Local Symbols

   The symbolic header points to each of the other tables, and also
   contains the number of entries.  It also contains a magic number
   and MIPS compiler version number, such as 2.0.

   The auxiliary table is a series of 32 bit integers, that are
   referenced as needed from the local symbol table.  Unlike standard
   COFF, the aux.  information does not follow the symbol that uses
   it, but rather is a separate table.  In theory, this would allow
   the MIPS compilers to collapse duplicate aux. entries, but I've not
   noticed this happening with the 1.31 compiler suite.  The different
   types of aux. entries are:

    1)    dnLow: Low bound on array dimension.

    2)    dnHigh: High bound on array dimension.

    3)    isym: Index to the local symbol which is the start of the
    function for the end of function first aux. entry.

    4)    width: Width of structures and bitfields.

    5)    count: Count of ranges for variant part.

    6)    rndx: A relative index into the symbol table.  The relative
    index field has two parts: rfd which is a pointer into the
    relative file index table or ST_RFDESCAPE which says the next
    aux. entry is the file number, and index: which is the pointer
    into the local symbol within a given file table.  This is for
    things like references to types defined in another file.

    7)    Type information: This is like the COFF type bits, except it
    is 32 bits instead of 16; they still have room to add new
    basic types; and they can handle more than 6 levels of array,
    pointer, function, etc.  Each type information field contains
    the following structure members:

        a)    fBitfield: a bit that says this is a bitfield, and the
        size in bits follows as the next aux. entry.

        b)    continued: a bit that says the next aux. entry is a
        continuation of the current type information (in case
        there are more than 6 levels of array/ptr/function).

        c)    bt: an integer containing the base type before adding
        array, pointer, function, etc. qualifiers.  The
        current base types that I have documentation for are:

            btNil        -- undefined
            btAdr        -- address - integer same size as ptr
            btChar        -- character
            btUChar        -- unsigned character
            btShort        -- short
            btUShort    -- unsigned short
            btInt        -- int
            btUInt        -- unsigned int
            btLong        -- long
            btULong        -- unsigned long
            btFloat        -- float (real)
            btDouble    -- Double (real)
            btStruct    -- Structure (Record)
            btUnion        -- Union (variant)
            btEnum        -- Enumerated
            btTypedef    -- defined via a typedef isymRef
            btRange        -- subrange of int
            btSet        -- pascal sets
            btComplex    -- fortran complex
            btDComplex    -- fortran double complex
            btIndirect    -- forward or unnamed typedef
            btFixedDec    -- Fixed Decimal
            btFloatDec    -- Float Decimal
            btString    -- Varying Length Character String
            btBit        -- Aligned Bit String
            btPicture    -- Picture
            btVoid        -- Void (MIPS cc revision >= 2.00)

        d)    tq0 - tq5: type qualifier fields as needed.  The
        current type qualifier fields I have documentation for
        are:

            tqNil        -- no more qualifiers
            tqPtr        -- pointer
            tqProc        -- procedure
            tqArray        -- array
            tqFar        -- 8086 far pointers
            tqVol        -- volatile


   The dense number table is used in the front ends, and disappears by
   the time the .o is created.

   With the 1.31 compiler suite, the optimization symbols don't seem
   to be used as far as I can tell.

   The linker is the first entity that creates the relative file
   descriptor table, and I believe it is used so that the individual
   file table pointers don't have to be rewritten when the objects are
   merged together into the program file.

   Unlike COFF, the basic symbol & string tables are split into
   external and local symbols/strings.  The relocation information
   only goes off of the external symbol table, and the debug
   information only goes off of the internal symbol table.  The
   external symbols can have links to an appropriate file index and
   symbol within the file to give it the appropriate type information.
   Because of this, the external symbols are actually larger than the
   internal symbols (to contain the link information), and contain the
   local symbol structure as a member, though this member is not the
   first member of the external symbol structure (!).  I suspect this
   split is to make strip easier to deal with.

   Each file table has offsets for where the line numbers, local
   strings, local symbols, and procedure table starts from within the
   global tables, and the indexs are reset to 0 for each of those
   tables for the file.

   The procedure table contains the binary equivalents of the .ent
   (start of the function address), .frame (what register is the
   virtual frame pointer, constant offset from the register to obtain
   the VFP, and what register holds the return address), .mask/.fmask
   (bitmask of saved registers, and where the first register is stored
   relative to the VFP) assembler directives.  It also contains the
   low and high bounds of the line numbers if debugging is turned on.

   The line number table is a compressed form of the normal COFF line
   table.  Each line number entry is either 1 or 3 bytes long, and
   contains a signed delta from the previous line, and an unsigned
   count of the number of instructions this statement takes.

   The local symbol table contains the following fields:

    1)    iss: index to the local string table giving the name of the
    symbol.

    2)    value: value of the symbol (address, register number, etc.).

    3)    st: symbol type.  The current symbol types are:

        stNil      -- Nuthin' special
        stGlobal      -- external symbol
        stStatic      -- static
        stParam      -- procedure argument
        stLocal      -- local variable
        stLabel      -- label
        stProc      -- External Procedure
        stBlock      -- beginning of block
        stEnd      -- end (of anything)
        stMember      -- member (of anything)
        stTypedef      -- type definition
        stFile      -- file name
        stRegReloc      -- register relocation
        stForward      -- forwarding address
        stStaticProc  -- Static procedure
        stConstant      -- const

    4)    sc: storage class.  The current storage classes are:

        scText      -- text symbol
        scData      -- initialized data symbol
        scBss      -- un-initialized data symbol
        scRegister      -- value of symbol is register number
        scAbs      -- value of symbol is absolute
        scUndefined   -- who knows?
        scCdbLocal      -- variable's value is IN se->va.??
        scBits      -- this is a bit field
        scCdbSystem      -- value is IN debugger's address space
        scRegImage      -- register value saved on stack
        scInfo      -- symbol contains debugger information
        scUserStruct  -- addr in struct user for current process
        scSData      -- load time only small data
        scSBss      -- load time only small common
        scRData      -- load time only read only data
        scVar      -- Var parameter (fortranpascal)
        scCommon      -- common variable
        scSCommon      -- small common
        scVarRegister -- Var parameter in a register
        scVariant      -- Variant record
        scSUndefined  -- small undefined(external) data
        scInit      -- .init section symbol

    5)    index: pointer to a local symbol or aux. entry.



   For the following program:

    #include <stdio.h>

    main(){
        printf("Hello World!\n");
        return 0;
    }

   Mips-tdump produces the following information:

   Global file header:
       magic number             0x162
       # sections               2
       timestamp                645311799, Wed Jun 13 17:16:39 1990
       symbolic header offset   284
       symbolic header size     96
       optional header          56
       flags                    0x0

   Symbolic header, magic number = 0x7009, vstamp = 1.31:

       Info                      Offset      Number       Bytes
       ====                      ======      ======      =====

       Line numbers                 380           4           4 [13]
       Dense numbers                  0           0           0
       Procedures Tables            384           1          52
       Local Symbols                436          16         192
       Optimization Symbols           0           0           0
       Auxiliary Symbols            628          39         156
       Local Strings                784          80          80
       External Strings             864         144         144
       File Tables                 1008           2         144
       Relative Files                 0           0           0
       External Symbols            1152          20         320

   File #0, "hello2.c"

       Name index  = 1          Readin      = No
       Merge       = No         Endian      = LITTLE
       Debug level = G2         Language    = C
       Adr         = 0x00000000

       Info                       Start      Number        Size      Offset
       ====                       =====      ======        ====      ======
       Local strings                  0          15          15         784
       Local symbols                  0           6          72         436
       Line numbers                   0          13          13         380
       Optimization symbols           0           0           0           0
       Procedures                     0           1          52         384
       Auxiliary symbols              0          14          56         628
       Relative Files                 0           0           0           0

    There are 6 local symbols, starting at 436

    Symbol# 0: "hello2.c"
        End+1 symbol  = 6
        String index  = 1
        Storage class = Text        Index  = 6
        Symbol type   = File        Value  = 0

    Symbol# 1: "main"
        End+1 symbol  = 5
        Type          = int
        String index  = 10
        Storage class = Text        Index  = 12
        Symbol type   = Proc        Value  = 0

    Symbol# 2: ""
        End+1 symbol  = 4
        String index  = 0
        Storage class = Text        Index  = 4
        Symbol type   = Block       Value  = 8

    Symbol# 3: ""
        First symbol  = 2
        String index  = 0
        Storage class = Text        Index  = 2
        Symbol type   = End         Value  = 28

    Symbol# 4: "main"
        First symbol  = 1
        String index  = 10
        Storage class = Text        Index  = 1
        Symbol type   = End         Value  = 52

    Symbol# 5: "hello2.c"
        First symbol  = 0
        String index  = 1
        Storage class = Text        Index  = 0
        Symbol type   = End         Value  = 0

    There are 14 auxiliary table entries, starting at 628.

    * #0               0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #1              24, [  24/      0], [ 6 0:0 0:0:0:0:0:0]
    * #2               8, [   8/      0], [ 2 0:0 0:0:0:0:0:0]
    * #3              16, [  16/      0], [ 4 0:0 0:0:0:0:0:0]
    * #4              24, [  24/      0], [ 6 0:0 0:0:0:0:0:0]
    * #5              32, [  32/      0], [ 8 0:0 0:0:0:0:0:0]
    * #6              40, [  40/      0], [10 0:0 0:0:0:0:0:0]
    * #7              44, [  44/      0], [11 0:0 0:0:0:0:0:0]
    * #8              12, [  12/      0], [ 3 0:0 0:0:0:0:0:0]
    * #9              20, [  20/      0], [ 5 0:0 0:0:0:0:0:0]
    * #10             28, [  28/      0], [ 7 0:0 0:0:0:0:0:0]
    * #11             36, [  36/      0], [ 9 0:0 0:0:0:0:0:0]
      #12              5, [   5/      0], [ 1 1:0 0:0:0:0:0:0]
      #13             24, [  24/      0], [ 6 0:0 0:0:0:0:0:0]

    There are 1 procedure descriptor entries, starting at 0.

    Procedure descriptor 0:
        Name index   = 10          Name          = "main"
        .mask 0x80000000,-4        .fmask 0x00000000,0
        .frame $29,24,$31
        Opt. start   = -1          Symbols start = 1
        First line # = 3           Last line #   = 6
        Line Offset  = 0           Address       = 0x00000000

    There are 4 bytes holding line numbers, starting at 380.
        Line           3,   delta     0,   count  2
        Line           4,   delta     1,   count  3
        Line           5,   delta     1,   count  2
        Line           6,   delta     1,   count  6

   File #1, "/usr/include/stdio.h"

    Name index  = 1          Readin      = No
    Merge       = Yes        Endian      = LITTLE
    Debug level = G2         Language    = C
    Adr         = 0x00000000

    Info                       Start      Number        Size      Offset
    ====                       =====      ======        ====      ======
    Local strings                 15          65          65         799
    Local symbols                  6          10         120         508
    Line numbers                   0           0           0         380
    Optimization symbols           0           0           0           0
    Procedures                     1           0           0         436
    Auxiliary symbols             14          25         100         684
    Relative Files                 0           0           0           0

    There are 10 local symbols, starting at 442

    Symbol# 0: "/usr/include/stdio.h"
        End+1 symbol  = 10
        String index  = 1
        Storage class = Text        Index  = 10
        Symbol type   = File        Value  = 0

    Symbol# 1: "_iobuf"
        End+1 symbol  = 9
        String index  = 22
        Storage class = Info        Index  = 9
        Symbol type   = Block       Value  = 20

    Symbol# 2: "_cnt"
        Type          = int
        String index  = 29
        Storage class = Info        Index  = 4
        Symbol type   = Member      Value  = 0

    Symbol# 3: "_ptr"
        Type          = ptr to char
        String index  = 34
        Storage class = Info        Index  = 15
        Symbol type   = Member      Value  = 32

    Symbol# 4: "_base"
        Type          = ptr to char
        String index  = 39
        Storage class = Info        Index  = 16
        Symbol type   = Member      Value  = 64

    Symbol# 5: "_bufsiz"
        Type          = int
        String index  = 45
        Storage class = Info        Index  = 4
        Symbol type   = Member      Value  = 96

    Symbol# 6: "_flag"
        Type          = short
        String index  = 53
        Storage class = Info        Index  = 3
        Symbol type   = Member      Value  = 128

    Symbol# 7: "_file"
        Type          = char
        String index  = 59
        Storage class = Info        Index  = 2
        Symbol type   = Member      Value  = 144

    Symbol# 8: ""
        First symbol  = 1
        String index  = 0
        Storage class = Info        Index  = 1
        Symbol type   = End         Value  = 0

    Symbol# 9: "/usr/include/stdio.h"
        First symbol  = 0
        String index  = 1
        Storage class = Text        Index  = 0
        Symbol type   = End         Value  = 0

    There are 25 auxiliary table entries, starting at 642.

    * #14             -1, [4095/1048575], [63 1:1 f:f:f:f:f:f]
      #15          65544, [   8/     16], [ 2 0:0 1:0:0:0:0:0]
      #16          65544, [   8/     16], [ 2 0:0 1:0:0:0:0:0]
    * #17         196656, [  48/     48], [12 0:0 3:0:0:0:0:0]
    * #18           8191, [4095/      1], [63 1:1 0:0:0:0:f:1]
    * #19              1, [   1/      0], [ 0 1:0 0:0:0:0:0:0]
    * #20          20479, [4095/      4], [63 1:1 0:0:0:0:f:4]
    * #21              1, [   1/      0], [ 0 1:0 0:0:0:0:0:0]
    * #22              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #23              2, [   2/      0], [ 0 0:1 0:0:0:0:0:0]
    * #24            160, [ 160/      0], [40 0:0 0:0:0:0:0:0]
    * #25              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #26              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #27              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #28              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #29              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #30              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #31              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #32              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #33              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #34              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #35              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #36              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #37              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]
    * #38              0, [   0/      0], [ 0 0:0 0:0:0:0:0:0]

    There are 0 procedure descriptor entries, starting at 1.

   There are 20 external symbols, starting at 1152

    Symbol# 0: "_iob"
        Type          = array [3 {160}] of struct _iobuf { ifd = 1, index = 1 }
        String index  = 0           Ifd    = 1
        Storage class = Nil         Index  = 17
        Symbol type   = Global      Value  = 60

    Symbol# 1: "fopen"
        String index  = 5           Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 2: "fdopen"
        String index  = 11          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 3: "freopen"
        String index  = 18          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 4: "popen"
        String index  = 26          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 5: "tmpfile"
        String index  = 32          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 6: "ftell"
        String index  = 40          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 7: "rewind"
        String index  = 46          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 8: "setbuf"
        String index  = 53          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 9: "setbuffer"
        String index  = 60          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 10: "setlinebuf"
        String index  = 70          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 11: "fgets"
        String index  = 81          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 12: "gets"
        String index  = 87          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 13: "ctermid"
        String index  = 92          Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 14: "cuserid"
        String index  = 100         Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 15: "tempnam"
        String index  = 108         Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 16: "tmpnam"
        String index  = 116         Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 17: "sprintf"
        String index  = 123         Ifd    = 1
        Storage class = Nil         Index  = 1048575
        Symbol type   = Proc        Value  = 0

    Symbol# 18: "main"
        Type          = int
        String index  = 131         Ifd    = 0
        Storage class = Text        Index  = 1
        Symbol type   = Proc        Value  = 0

    Symbol# 19: "printf"
        String index  = 136         Ifd    = 0
        Storage class = Undefined   Index  = 1048575
        Symbol type   = Proc        Value  = 0

   The following auxiliary table entries were unused:

    #0               0  0x00000000  void
    #2               8  0x00000008  char
    #3              16  0x00000010  short
    #4              24  0x00000018  int
    #5              32  0x00000020  long
    #6              40  0x00000028  float
    #7              44  0x0000002c  double
    #8              12  0x0000000c  unsigned char
    #9              20  0x00000014  unsigned short
    #10             28  0x0000001c  unsigned int
    #11             36  0x00000024  unsigned long
    #14              0  0x00000000  void
    #15             24  0x00000018  int
    #19             32  0x00000020  long
    #20             40  0x00000028  float
    #21             44  0x0000002c  double
    #22             12  0x0000000c  unsigned char
    #23             20  0x00000014  unsigned short
    #24             28  0x0000001c  unsigned int
    #25             36  0x00000024  unsigned long
    #26             48  0x00000030  struct no name { ifd = -1, index = 1048575 }
*/

/* Redefinition of of storage classes as an enumeration for better
   debugging.  */

typedef enum sc {
  sc_Nil     = scNil,      /* no storage class */
  sc_Text     = scText,      /* text symbol */
  sc_Data     = scData,      /* initialized data symbol */
  sc_Bss     = scBss,      /* un-initialized data symbol */
  sc_Register     = scRegister,      /* value of symbol is register number */
  sc_Abs     = scAbs,      /* value of symbol is absolute */
  sc_Undefined     = scUndefined,      /* who knows? */
  sc_CdbLocal     = scCdbLocal,      /* variable's value is IN se->va.?? */
  sc_Bits     = scBits,      /* this is a bit field */
  sc_CdbSystem     = scCdbSystem,      /* value is IN CDB's address space */
  sc_RegImage     = scRegImage,      /* register value saved on stack */
  sc_Info     = scInfo,      /* symbol contains debugger information */
  sc_UserStruct     = scUserStruct,  /* addr in struct user for current process */
  sc_SData     = scSData,      /* load time only small data */
  sc_SBss     = scSBss,      /* load time only small common */
  sc_RData     = scRData,      /* load time only read only data */
  sc_Var     = scVar,      /* Var parameter (fortran,pascal) */
  sc_Common     = scCommon,      /* common variable */
  sc_SCommon     = scSCommon,      /* small common */
  sc_VarRegister = scVarRegister, /* Var parameter in a register */
  sc_Variant     = scVariant,      /* Variant record */
  sc_SUndefined     = scSUndefined,  /* small undefined(external) data */
  sc_Init     = scInit,      /* .init section symbol */
  sc_Max     = scMax      /* Max storage class+1 */
} sc_t;

/* Redefinition of symbol type.  */

typedef enum st {
  st_Nil    = stNil,    /* Nuthin' special */
  st_Global    = stGlobal,    /* external symbol */
  st_Static    = stStatic,    /* static */
  st_Param    = stParam,    /* procedure argument */
  st_Local    = stLocal,    /* local variable */
  st_Label    = stLabel,    /* label */
  st_Proc    = stProc,    /*     "      "     Procedure */
  st_Block    = stBlock,    /* beginning of block */
  st_End    = stEnd,    /* end (of anything) */
  st_Member    = stMember,    /* member (of anything    - struct/union/enum */
  st_Typedef    = stTypedef,    /* type definition */
  st_File    = stFile,    /* file name */
  st_RegReloc    = stRegReloc,    /* register relocation */
  st_Forward    = stForward,    /* forwarding address */
  st_StaticProc    = stStaticProc,    /* load time only static procs */
  st_Constant    = stConstant,    /* const */
  st_Str    = stStr,    /* string */
  st_Number    = stNumber,    /* pure number (ie. 4 NOR 2+2) */
  st_Expr    = stExpr,    /* 2+2 vs. 4 */
  st_Type    = stType,    /* post-coercion SER */
  st_Max    = stMax        /* max type+1 */
} st_t;

/* Redefinition of type qualifiers.  */

typedef enum tq {
  tq_Nil    = tqNil,    /* bt is what you see */
  tq_Ptr    = tqPtr,    /* pointer */
  tq_Proc    = tqProc,    /* procedure */
  tq_Array    = tqArray,    /* duh */
  tq_Far    = tqFar,    /* longer addressing - 8086/8 land */
  tq_Vol    = tqVol,    /* volatile */
  tq_Max    = tqMax        /* Max type qualifier+1 */
} tq_t;

/* Redefinition of basic types.  */

typedef enum bt {
  bt_Nil    = btNil,    /* undefined */
  bt_Adr    = btAdr,    /* address - integer same size as pointer */
  bt_Char    = btChar,    /* character */
  bt_UChar    = btUChar,    /* unsigned character */
  bt_Short    = btShort,    /* short */
  bt_UShort    = btUShort,    /* unsigned short */
  bt_Int    = btInt,    /* int */
  bt_UInt    = btUInt,    /* unsigned int */
  bt_Long    = btLong,    /* long */
  bt_ULong    = btULong,    /* unsigned long */
  bt_Float    = btFloat,    /* float (real) */
  bt_Double    = btDouble,    /* Double (real) */
  bt_Struct    = btStruct,    /* Structure (Record) */
  bt_Union    = btUnion,    /* Union (variant) */
  bt_Enum    = btEnum,    /* Enumerated */
  bt_Typedef    = btTypedef,    /* defined via a typedef, isymRef points */
  bt_Range    = btRange,    /* subrange of int */
  bt_Set    = btSet,    /* pascal sets */
  bt_Complex    = btComplex,    /* fortran complex */
  bt_DComplex    = btDComplex,    /* fortran double complex */
  bt_Indirect    = btIndirect,    /* forward or unnamed typedef */
  bt_FixedDec    = btFixedDec,    /* Fixed Decimal */
  bt_FloatDec    = btFloatDec,    /* Float Decimal */
  bt_String    = btString,    /* Varying Length Character String */
  bt_Bit    = btBit,    /* Aligned Bit String */
  bt_Picture    = btPicture,    /* Picture */
  bt_Void    = btVoid,    /* Void */
  bt_Max    = btMax        /* Max basic type+1 */
} bt_t;

#define N_TQ itqMax

/* States for whether to hash type or not.  */
typedef enum hash_state {
  hash_no    = 0,        /* don't hash type */
  hash_yes    = 1,        /* ok to hash type, or use previous hash */
  hash_record    = 2        /* ok to record hash, but don't use prev. */
} hash_state_t;

/* Types of different sized allocation requests.  */
enum alloc_type {
  alloc_type_none,        /* dummy value */
  alloc_type_scope,        /* nested scopes linked list */
  alloc_type_vlinks,        /* glue linking pages in varray */
  alloc_type_shash,        /* string hash element */
  alloc_type_thash,        /* type hash element */
  alloc_type_tag,        /* struct/union/tag element */
  alloc_type_forward,        /* element to hold unknown tag */
  alloc_type_thead,        /* head of type hash list */
  alloc_type_varray,        /* general varray allocation */
  alloc_type_lineno,        /* line number list */
  alloc_type_last        /* last+1 element for array bounds */
};

/* Types of auxiliary type information.  */
enum aux_type {
  aux_tir,            /* TIR type information */
  aux_rndx,            /* relative index into symbol table */
  aux_dnLow,            /* low dimension */
  aux_dnHigh,            /* high dimension */
  aux_isym,            /* symbol table index (end of proc) */
  aux_iss,            /* index into string space (not used) */
  aux_width,            /* width for non-default sized struc fields */
  aux_count            /* count of ranges for variant arm */
};

/* Structures to provide n-number of virtual arrays, each of which can
   grow linearly, and which are written in the object file as
   sequential pages.  On systems with a BSD malloc, the
   MAX_CLUSTER_PAGES should be 1 less than a power of two, since
   malloc adds it's overhead, and rounds up to the next power of 2.
   Pages are linked together via a linked list.

   If PAGE_SIZE is > 4096, the string length in the shash_t structure
   can't be represented (assuming there are strings > 4096 bytes).  */

#ifndef PAGE_SIZE
#define PAGE_SIZE 4096        /* size of varray pages */
#endif

#define PAGE_USIZE ((unsigned long) PAGE_SIZE)


#ifndef MAX_CLUSTER_PAGES    /* # pages to get from system */
#define MAX_CLUSTER_PAGES 63
#endif

/* Linked list connecting separate page allocations.  */
typedef struct vlinks {
  struct vlinks    *prev;        /* previous set of pages */
  struct vlinks *next;        /* next set of pages */
  union  page   *datum;        /* start of page */
  unsigned long     start_index;    /* starting index # of page */
} vlinks_t;


/* Virtual array header.  */
typedef struct varray {
  vlinks_t    *first;            /* first page link */
  vlinks_t    *last;            /* last page link */
  unsigned long     num_allocated;        /* # objects allocated */
  unsigned short object_size;        /* size in bytes of each object */
  unsigned short objects_per_page;    /* # objects that can fit on a page */
  unsigned short objects_last_page;    /* # objects allocated on last page */
} varray_t;

#ifndef MALLOC_CHECK
#define OBJECTS_PER_PAGE(type) (PAGE_SIZE / sizeof (type))
#else
#define OBJECTS_PER_PAGE(type) ((sizeof (type) > 1) ? 1 : PAGE_SIZE)
#endif

#define INIT_VARRAY(type) {    /* macro to initialize a varray */    \
  (vlinks_t *)0,        /* first */                \
  (vlinks_t *)0,        /* last */                \
  0,                /* num_allocated */            \
  sizeof (type),        /* object_size */            \
  OBJECTS_PER_PAGE (type),    /* objects_per_page */            \
  OBJECTS_PER_PAGE (type),    /* objects_last_page */            \
}


/* Master type for indexes within the symbol table. */
typedef unsigned long symint_t;


/* Linked list support for nested scopes (file, block, structure, etc.).  */
typedef struct scope {
  struct scope    *prev;        /* previous scope level */
  struct scope    *free;        /* free list pointer */
  struct localsym *lsym;    /* pointer to local symbol node */
  st_t         type;        /* type of the node */
} scope_t;


/* For a local symbol we store a gas symbol as well as the debugging
   information we generate.  The gas symbol will be NULL if this is
   only a debugging symbol.  */
typedef struct localsym {
  const char *name;        /* symbol name */
  symbolS *as_sym;        /* symbol as seen by gas */
  struct efdr *file_ptr;    /* file pointer */
  struct ecoff_proc *proc_ptr;    /* proc pointer */
  struct localsym *begin_ptr;    /* symbol at start of block */
  struct ecoff_aux *index_ptr;    /* index value to be filled in */
  struct forward *forward_ref;    /* forward references to this symbol */
  long sym_index;        /* final symbol index */
  EXTR ecoff_sym;        /* ECOFF debugging symbol */
} localsym_t;


/* For aux information we keep the type and the data.  */
typedef struct ecoff_aux {
  enum aux_type type;        /* aux type */
  AUXU data;            /* aux data */
} aux_t;

/* For a procedure we store the gas symbol as well as the PDR
   debugging information.  */
typedef struct ecoff_proc {
  localsym_t *sym;        /* associated symbol */
  PDR pdr;            /* ECOFF debugging info */
} proc_t;

/* Number of proc_t structures allocated.  */
static unsigned long proc_cnt;


/* Forward reference list for tags referenced, but not yet defined.  */
typedef struct forward {
  struct forward *next;        /* next forward reference */
  struct forward *free;        /* free list pointer */
  aux_t         *ifd_ptr;    /* pointer to store file index */
  aux_t         *index_ptr;    /* pointer to store symbol index */
} forward_t;


/* Linked list support for tags.  The first tag in the list is always
   the current tag for that block.  */
typedef struct tag {
  struct tag     *free;        /* free list pointer */
  struct shash     *hash_ptr;    /* pointer to the hash table head */
  struct tag     *same_name;    /* tag with same name in outer scope */
  struct tag     *same_block;    /* next tag defined in the same block.  */
  struct forward *forward_ref;    /* list of forward references */
  bt_t          basic_type;    /* bt_Struct, bt_Union, or bt_Enum */
  symint_t      ifd;        /* file # tag defined in */
  localsym_t     *sym;        /* file's local symbols */
} tag_t;


/* Head of a block's linked list of tags.  */
typedef struct thead {
  struct thead    *prev;        /* previous block */
  struct thead    *free;        /* free list pointer */
  struct tag    *first_tag;    /* first tag in block defined */
} thead_t;


/* Union containing pointers to each the small structures which are freed up.  */
typedef union small_free {
  scope_t    *f_scope;    /* scope structure */
  thead_t    *f_thead;    /* tag head structure */
  tag_t        *f_tag;        /* tag element structure */
  forward_t    *f_forward;    /* forward tag reference */
} small_free_t;


/* String hash table entry.  */

typedef struct shash {
  char        *string;    /* string we are hashing */
  symint_t     indx;        /* index within string table */
  EXTR        *esym_ptr;    /* global symbol pointer */
  localsym_t    *sym_ptr;    /* local symbol pointer */
  localsym_t    *end_ptr;    /* symbol pointer to end block */
  tag_t        *tag_ptr;    /* tag pointer */
  proc_t    *proc_ptr;    /* procedure descriptor pointer */
} shash_t;


/* Type hash table support.  The size of the hash table must fit
   within a page with the other extended file descriptor information.
   Because unique types which are hashed are fewer in number than
   strings, we use a smaller hash value.  */

#define HASHBITS 30

#ifndef THASH_SIZE
#define THASH_SIZE 113
#endif

typedef struct thash {
  struct thash    *next;        /* next hash value */
  AUXU         type;        /* type we are hashing */
  symint_t     indx;        /* index within string table */
} thash_t;


/* Extended file descriptor that contains all of the support necessary
   to add things to each file separately.  */
typedef struct efdr {
  FDR         fdr;        /* File header to be written out */
  FDR        *orig_fdr;    /* original file header */
  char        *name;        /* filename */
  symint_t     void_type;    /* aux. pointer to 'void' type */
  symint_t     int_type;    /* aux. pointer to 'int' type */
  scope_t    *cur_scope;    /* current nested scopes */
  symint_t     file_index;    /* current file number */
  int         nested_scopes;    /* # nested scopes */
  varray_t     strings;    /* local strings */
  varray_t     symbols;    /* local symbols */
  varray_t     procs;        /* procedures */
  varray_t     aux_syms;    /* auxiliary symbols */
  struct efdr    *next_file;    /* next file descriptor */
                /* string/type hash tables */
  struct hash_control *str_hash;    /* string hash table */
  thash_t    *thash_head[THASH_SIZE];
} efdr_t;

/* Pre-initialized extended file structure.  */
static const efdr_t init_file =
{
  {            /* FDR structure */
    0,            /* adr:        memory address of beginning of file */
    0,            /* rss:        file name (of source, if known) */
    0,            /* issBase:    file's string space */
    0,            /* cbSs:    number of bytes in the ss */
    0,            /* isymBase:    beginning of symbols */
    0,            /* csym:    count file's of symbols */
    0,            /* ilineBase:    file's line symbols */
    0,            /* cline:    count of file's line symbols */
    0,            /* ioptBase:    file's optimization entries */
    0,            /* copt:    count of file's optimization entries */
    0,            /* ipdFirst:    start of procedures for this file */
    0,            /* cpd:        count of procedures for this file */
    0,            /* iauxBase:    file's auxiliary entries */
    0,            /* caux:    count of file's auxiliary entries */
    0,            /* rfdBase:    index into the file indirect table */
    0,            /* crfd:    count file indirect entries */
    langC,        /* lang:    language for this file */
    0,            /* fMerge:    whether this file can be merged */
    0,            /* fReadin:    true if read in (not just created) */
#ifdef TARGET_BYTES_BIG_ENDIAN
    1,            /* fBigendian:    if 1, compiled on big endian machine */
#else
    0,            /* fBigendian:    if 1, compiled on big endian machine */
#endif
    GLEVEL_2,        /* glevel:    level this file was compiled with */
    0,            /* reserved:    reserved for future use */
    0,            /* cbLineOffset: byte offset from header for this file ln's */
    0,            /* cbLine:    size of lines for this file */
  },

  (FDR *)0,        /* orig_fdr:    original file header pointer */
  (char *)0,        /* name:    pointer to filename */
  0,            /* void_type:    ptr to aux node for void type */
  0,            /* int_type:    ptr to aux node for int type */
  (scope_t *)0,        /* cur_scope:    current scope being processed */
  0,            /* file_index:    current file # */
  0,            /* nested_scopes: # nested scopes */
  INIT_VARRAY (char),    /* strings:    local string varray */
  INIT_VARRAY (localsym_t),    /* symbols:    local symbols varray */
  INIT_VARRAY (proc_t),    /* procs:    procedure varray */
  INIT_VARRAY (aux_t),    /* aux_syms:    auxiliary symbols varray */

  (struct efdr *)0,    /* next_file:    next file structure */

  (struct hash_control *)0,    /* str_hash:    string hash table */
  { 0 },        /* thash_head:    type hash table */
};


static efdr_t *first_file;            /* first file descriptor */
static efdr_t **last_file_ptr = &first_file;    /* file descriptor tail */


/* Line number information is kept in a list until the assembly is
   finished.  */
typedef struct lineno_list {
  struct lineno_list *next;    /* next element in list */
  efdr_t *file;            /* file this line is in */
  proc_t *proc;            /* procedure this line is in */
  fragS *frag;            /* fragment this line number is in */
  unsigned long paddr;        /* offset within fragment */
  long lineno;            /* actual line number */
} lineno_list_t;

static lineno_list_t *first_lineno;
static lineno_list_t **last_lineno_ptr = &first_lineno;

/* Sometimes there will be some .loc statements before a .ent.  We
   keep them in this list so that we can fill in the procedure pointer
   after we see the .ent.  */
static lineno_list_t *noproc_lineno;

/* Union of various things that are held in pages.  */
typedef union page {
  char        byte    [ PAGE_SIZE ];
  unsigned char    ubyte    [ PAGE_SIZE ];
  efdr_t    file    [ PAGE_SIZE / sizeof (efdr_t)         ];
  FDR        ofile    [ PAGE_SIZE / sizeof (FDR)         ];
  proc_t    proc    [ PAGE_SIZE / sizeof (proc_t)         ];
  localsym_t    sym    [ PAGE_SIZE / sizeof (localsym_t)    ];
  aux_t        aux    [ PAGE_SIZE / sizeof (aux_t)         ];
  DNR        dense    [ PAGE_SIZE / sizeof (DNR)         ];
  scope_t    scope    [ PAGE_SIZE / sizeof (scope_t)         ];
  vlinks_t    vlinks    [ PAGE_SIZE / sizeof (vlinks_t)         ];
  shash_t    shash    [ PAGE_SIZE / sizeof (shash_t)         ];
  thash_t    thash    [ PAGE_SIZE / sizeof (thash_t)         ];
  tag_t        tag    [ PAGE_SIZE / sizeof (tag_t)         ];
  forward_t    forward    [ PAGE_SIZE / sizeof (forward_t)     ];
  thead_t    thead    [ PAGE_SIZE / sizeof (thead_t)         ];
  lineno_list_t    lineno    [ PAGE_SIZE / sizeof (lineno_list_t) ];
} page_t;


/* Structure holding allocation information for small sized structures.  */
typedef struct alloc_info {
  char        *alloc_name;    /* name of this allocation type (must be first) */
  page_t    *cur_page;    /* current page being allocated from */
  small_free_t     free_list;    /* current free list if any */
  int         unallocated;    /* number of elements unallocated on page */
  int         total_alloc;    /* total number of allocations */
  int         total_free;    /* total number of frees */
  int         total_pages;    /* total number of pages allocated */
} alloc_info_t;


/* Type information collected together.  */
typedef struct type_info {
  bt_t          basic_type;        /* basic type */
  int          orig_type;        /* original COFF-based type */
  int          num_tq;            /* # type qualifiers */
  int          num_dims;            /* # dimensions */
  int          num_sizes;        /* # sizes */
  int          extra_sizes;        /* # extra sizes not tied with dims */
  tag_t *     tag_ptr;            /* tag pointer */
  int          bitfield;            /* symbol is a bitfield */
  tq_t          type_qualifiers[N_TQ];    /* type qualifiers (ptr, func, array)*/
  symint_t    dimensions     [N_TQ];    /* dimensions for each array */
  symint_t    sizes         [N_TQ+2];    /* sizes of each array slice + size of
                       struct/union/enum + bitfield size */
} type_info_t;

/* Pre-initialized type_info struct.  */
static const type_info_t type_info_init = {
  bt_Nil,                /* basic type */
  T_NULL,                /* original COFF-based type */
  0,                    /* # type qualifiers */
  0,                    /* # dimensions */
  0,                    /* # sizes */
  0,                    /* sizes not tied with dims */
  NULL,                    /* ptr to tag */
  0,                    /* bitfield */
  {                    /* type qualifiers */
    tq_Nil,
    tq_Nil,
    tq_Nil,
    tq_Nil,
    tq_Nil,
    tq_Nil,
  },
  {                    /* dimensions */
    0,
    0,
    0,
    0,
    0,
    0
  },
  {                    /* sizes */
    0,
    0,
    0,
    0,
    0,
    0,
    0,
    0,
  },
};

/* Global hash table for the tags table and global table for file
   descriptors.  */

static varray_t file_desc    = INIT_VARRAY (efdr_t);

static struct hash_control *tag_hash;

/* Static types for int and void.  Also, remember the last function's
   type (which is set up when we encounter the declaration for the
   function, and used when the end block for the function is emitted.  */

static type_info_t int_type_info;
static type_info_t void_type_info;
static type_info_t last_func_type_info;
static symbolS *last_func_sym_value;


/* Convert COFF basic type to ECOFF basic type.  The T_NULL type
   really should use bt_Void, but this causes the current ecoff GDB to
   issue unsupported type messages, and the Ultrix 4.00 dbx (aka MIPS
   2.0) doesn't understand it, even though the compiler generates it.
   Maybe this will be fixed in 2.10 or 2.20 of the MIPS compiler
   suite, but for now go with what works.

   It would make sense for the .type and .scl directives to use the
   ECOFF numbers directly, rather than using the COFF numbers and
   mapping them.  Unfortunately, this is historically what mips-tfile
   expects, and changing gcc now would be a considerable pain (the
   native compiler generates debugging information internally, rather
   than via the assembler, so it will never use .type or .scl).  */

static const bt_t map_coff_types[] = {
  bt_Nil,            /* T_NULL */
  bt_Nil,            /* T_ARG */
  bt_Char,            /* T_CHAR */
  bt_Short,            /* T_SHORT */
  bt_Int,            /* T_INT */
  bt_Long,            /* T_LONG */
  bt_Float,            /* T_FLOAT */
  bt_Double,            /* T_DOUBLE */
  bt_Struct,            /* T_STRUCT */
  bt_Union,            /* T_UNION */
  bt_Enum,            /* T_ENUM */
  bt_Enum,            /* T_MOE */
  bt_UChar,            /* T_UCHAR */
  bt_UShort,            /* T_USHORT */
  bt_UInt,            /* T_UINT */
  bt_ULong            /* T_ULONG */
};

/* Convert COFF storage class to ECOFF storage class.  */
static const sc_t map_coff_storage[] = {
  sc_Nil,            /*   0: C_NULL */
  sc_Abs,            /*   1: C_AUTO      auto var */
  sc_Undefined,            /*   2: C_EXT      external */
  sc_Data,            /*   3: C_STAT      static */
  sc_Register,            /*   4: C_REG      register */
  sc_Undefined,            /*   5: C_EXTDEF  ??? */
  sc_Text,            /*   6: C_LABEL      label */
  sc_Text,            /*   7: C_ULABEL  user label */
  sc_Info,            /*   8: C_MOS      member of struct */
  sc_Abs,            /*   9: C_ARG      argument */
  sc_Info,            /*  10: C_STRTAG  struct tag */
  sc_Info,            /*  11: C_MOU      member of union */
  sc_Info,            /*  12: C_UNTAG   union tag */
  sc_Info,            /*  13: C_TPDEF      typedef */
  sc_Data,            /*  14: C_USTATIC ??? */
  sc_Info,            /*  15: C_ENTAG      enum tag */
  sc_Info,            /*  16: C_MOE      member of enum */
  sc_Register,            /*  17: C_REGPARM register parameter */
  sc_Bits,            /*  18; C_FIELD      bitfield */
  sc_Nil,            /*  19 */
  sc_Nil,            /*  20 */
  sc_Nil,            /*  21 */
  sc_Nil,            /*  22 */
  sc_Nil,            /*  23 */
  sc_Nil,            /*  24 */
  sc_Nil,            /*  25 */
  sc_Nil,            /*  26 */
  sc_Nil,            /*  27 */
  sc_Nil,            /*  28 */
  sc_Nil,            /*  29 */
  sc_Nil,            /*  30 */
  sc_Nil,            /*  31 */
  sc_Nil,            /*  32 */
  sc_Nil,            /*  33 */
  sc_Nil,            /*  34 */
  sc_Nil,            /*  35 */
  sc_Nil,            /*  36 */
  sc_Nil,            /*  37 */
  sc_Nil,            /*  38 */
  sc_Nil,            /*  39 */
  sc_Nil,            /*  40 */
  sc_Nil,            /*  41 */
  sc_Nil,            /*  42 */
  sc_Nil,            /*  43 */
  sc_Nil,            /*  44 */
  sc_Nil,            /*  45 */
  sc_Nil,            /*  46 */
  sc_Nil,            /*  47 */
  sc_Nil,            /*  48 */
  sc_Nil,            /*  49 */
  sc_Nil,            /*  50 */
  sc_Nil,            /*  51 */
  sc_Nil,            /*  52 */
  sc_Nil,            /*  53 */
  sc_Nil,            /*  54 */
  sc_Nil,            /*  55 */
  sc_Nil,            /*  56 */
  sc_Nil,            /*  57 */
  sc_Nil,            /*  58 */
  sc_Nil,            /*  59 */
  sc_Nil,            /*  60 */
  sc_Nil,            /*  61 */
  sc_Nil,            /*  62 */
  sc_Nil,            /*  63 */
  sc_Nil,            /*  64 */
  sc_Nil,            /*  65 */
  sc_Nil,            /*  66 */
  sc_Nil,            /*  67 */
  sc_Nil,            /*  68 */
  sc_Nil,            /*  69 */
  sc_Nil,            /*  70 */
  sc_Nil,            /*  71 */
  sc_Nil,            /*  72 */
  sc_Nil,            /*  73 */
  sc_Nil,            /*  74 */
  sc_Nil,            /*  75 */
  sc_Nil,            /*  76 */
  sc_Nil,            /*  77 */
  sc_Nil,            /*  78 */
  sc_Nil,            /*  79 */
  sc_Nil,            /*  80 */
  sc_Nil,            /*  81 */
  sc_Nil,            /*  82 */
  sc_Nil,            /*  83 */
  sc_Nil,            /*  84 */
  sc_Nil,            /*  85 */
  sc_Nil,            /*  86 */
  sc_Nil,            /*  87 */
  sc_Nil,            /*  88 */
  sc_Nil,            /*  89 */
  sc_Nil,            /*  90 */
  sc_Nil,            /*  91 */
  sc_Nil,            /*  92 */
  sc_Nil,            /*  93 */
  sc_Nil,            /*  94 */
  sc_Nil,            /*  95 */
  sc_Nil,            /*  96 */
  sc_Nil,            /*  97 */
  sc_Nil,            /*  98 */
  sc_Nil,            /*  99 */
  sc_Text,            /* 100: C_BLOCK  block start/end */
  sc_Text,            /* 101: C_FCN     function start/end */
  sc_Info,            /* 102: C_EOS     end of struct/union/enum */
  sc_Nil,            /* 103: C_FILE     file start */
  sc_Nil,            /* 104: C_LINE     line number */
  sc_Nil,            /* 105: C_ALIAS     combined type info */
  sc_Nil,            /* 106: C_HIDDEN ??? */
};

/* Convert COFF storage class to ECOFF symbol type.  */
static const st_t map_coff_sym_type[] = {
  st_Nil,            /*   0: C_NULL */
  st_Local,            /*   1: C_AUTO      auto var */
  st_Global,            /*   2: C_EXT      external */
  st_Static,            /*   3: C_STAT      static */
  st_Local,            /*   4: C_REG      register */
  st_Global,            /*   5: C_EXTDEF  ??? */
  st_Label,            /*   6: C_LABEL      label */
  st_Label,            /*   7: C_ULABEL  user label */
  st_Member,            /*   8: C_MOS      member of struct */
  st_Param,            /*   9: C_ARG      argument */
  st_Block,            /*  10: C_STRTAG  struct tag */
  st_Member,            /*  11: C_MOU      member of union */
  st_Block,            /*  12: C_UNTAG   union tag */
  st_Typedef,            /*  13: C_TPDEF      typedef */
  st_Static,            /*  14: C_USTATIC ??? */
  st_Block,            /*  15: C_ENTAG      enum tag */
  st_Member,            /*  16: C_MOE      member of enum */
  st_Param,            /*  17: C_REGPARM register parameter */
  st_Member,            /*  18; C_FIELD      bitfield */
  st_Nil,            /*  19 */
  st_Nil,            /*  20 */
  st_Nil,            /*  21 */
  st_Nil,            /*  22 */
  st_Nil,            /*  23 */
  st_Nil,            /*  24 */
  st_Nil,            /*  25 */
  st_Nil,            /*  26 */
  st_Nil,            /*  27 */
  st_Nil,            /*  28 */
  st_Nil,            /*  29 */
  st_Nil,            /*  30 */
  st_Nil,            /*  31 */
  st_Nil,            /*  32 */
  st_Nil,            /*  33 */
  st_Nil,            /*  34 */
  st_Nil,            /*  35 */
  st_Nil,            /*  36 */
  st_Nil,            /*  37 */
  st_Nil,            /*  38 */
  st_Nil,            /*  39 */
  st_Nil,            /*  40 */
  st_Nil,            /*  41 */
  st_Nil,            /*  42 */
  st_Nil,            /*  43 */
  st_Nil,            /*  44 */
  st_Nil,            /*  45 */
  st_Nil,            /*  46 */
  st_Nil,            /*  47 */
  st_Nil,            /*  48 */
  st_Nil,            /*  49 */
  st_Nil,            /*  50 */
  st_Nil,            /*  51 */
  st_Nil,            /*  52 */
  st_Nil,            /*  53 */
  st_Nil,            /*  54 */
  st_Nil,            /*  55 */
  st_Nil,            /*  56 */
  st_Nil,            /*  57 */
  st_Nil,            /*  58 */
  st_Nil,            /*  59 */
  st_Nil,            /*  60 */
  st_Nil,            /*  61 */
  st_Nil,            /*  62 */
  st_Nil,            /*  63 */
  st_Nil,            /*  64 */
  st_Nil,            /*  65 */
  st_Nil,            /*  66 */
  st_Nil,            /*  67 */
  st_Nil,            /*  68 */
  st_Nil,            /*  69 */
  st_Nil,            /*  70 */
  st_Nil,            /*  71 */
  st_Nil,            /*  72 */
  st_Nil,            /*  73 */
  st_Nil,            /*  74 */
  st_Nil,            /*  75 */
  st_Nil,            /*  76 */
  st_Nil,            /*  77 */
  st_Nil,            /*  78 */
  st_Nil,            /*  79 */
  st_Nil,            /*  80 */
  st_Nil,            /*  81 */
  st_Nil,            /*  82 */
  st_Nil,            /*  83 */
  st_Nil,            /*  84 */
  st_Nil,            /*  85 */
  st_Nil,            /*  86 */
  st_Nil,            /*  87 */
  st_Nil,            /*  88 */
  st_Nil,            /*  89 */
  st_Nil,            /*  90 */
  st_Nil,            /*  91 */
  st_Nil,            /*  92 */
  st_Nil,            /*  93 */
  st_Nil,            /*  94 */
  st_Nil,            /*  95 */
  st_Nil,            /*  96 */
  st_Nil,            /*  97 */
  st_Nil,            /*  98 */
  st_Nil,            /*  99 */
  st_Block,            /* 100: C_BLOCK  block start/end */
  st_Proc,            /* 101: C_FCN     function start/end */
  st_End,            /* 102: C_EOS     end of struct/union/enum */
  st_File,            /* 103: C_FILE     file start */
  st_Nil,            /* 104: C_LINE     line number */
  st_Nil,            /* 105: C_ALIAS     combined type info */
  st_Nil,            /* 106: C_HIDDEN ??? */
};


/* Keep track of different sized allocation requests.  */
static alloc_info_t alloc_counts[ (int)alloc_type_last ];

/* Various statics.  */
static efdr_t  *cur_file_ptr    = (efdr_t *) 0;    /* current file desc. header */
static proc_t  *cur_proc_ptr    = (proc_t *) 0;    /* current procedure header */
static proc_t  *first_proc_ptr  = (proc_t *) 0; /* first procedure header */
static thead_t *top_tag_head    = (thead_t *) 0; /* top level tag head */
static thead_t *cur_tag_head    = (thead_t *) 0; /* current tag head */
#ifdef ECOFF_DEBUG
static int    debug        = 0;         /* trace functions */
#endif
static int    stabs_seen    = 0;        /* != 0 if stabs have been seen */

static int current_file_idx;
static const char *current_stabs_filename;

/* Pseudo symbol to use when putting stabs into the symbol table.  */
#ifndef STABS_SYMBOL
#define STABS_SYMBOL "@stabs"
#endif

static char stabs_symbol[] = STABS_SYMBOL;

/* Prototypes for functions defined in this file.  */

static void add_varray_page PARAMS ((varray_t *vp));
static symint_t add_string PARAMS ((varray_t *vp,
                    struct hash_control *hash_tbl,
                    const char *str,
                    shash_t **ret_hash));
static localsym_t *add_ecoff_symbol PARAMS ((const char *str, st_t type,
                         sc_t storage, symbolS *sym,
                         symint_t value,
                         symint_t indx));
static symint_t add_aux_sym_symint PARAMS ((symint_t aux_word));
static symint_t add_aux_sym_rndx PARAMS ((int file_index,
                      symint_t sym_index));
static symint_t add_aux_sym_tir PARAMS ((type_info_t *t,
                     hash_state_t state,
                     thash_t **hash_tbl));
static tag_t *get_tag PARAMS ((const char *tag, localsym_t *sym,
                   bt_t basic_type));
static void add_unknown_tag PARAMS ((tag_t *ptag));
static void add_procedure PARAMS ((char *func));
static void add_file PARAMS ((const char *file_name, int indx));
#ifdef ECOFF_DEBUG
static char *sc_to_string PARAMS ((sc_t storage_class));
static char *st_to_string PARAMS ((st_t symbol_type));
#endif
static void mark_stabs PARAMS ((int));
static char *ecoff_add_bytes PARAMS ((char **buf, char **bufend,
                      char *bufptr, unsigned long need));
static unsigned long ecoff_padding_adjust
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset, char **bufptrptr));
static unsigned long ecoff_build_lineno
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset, long *linecntptr));
static unsigned long ecoff_build_symbols
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset));
static unsigned long ecoff_build_procs
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset));
static unsigned long ecoff_build_aux
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset));
static unsigned long ecoff_build_strings PARAMS ((char **buf, char **bufend,
                          unsigned long offset,
                          varray_t *vp));
static unsigned long ecoff_build_ss
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset));
static unsigned long ecoff_build_fdr
  PARAMS ((const struct ecoff_debug_swap *backend, char **buf, char **bufend,
       unsigned long offset));
static void ecoff_setup_ext PARAMS ((void));
static page_t *allocate_cluster PARAMS ((unsigned long npages));
static page_t *allocate_page PARAMS ((void));
static scope_t *allocate_scope PARAMS ((void));
static void free_scope PARAMS ((scope_t *ptr));
static vlinks_t *allocate_vlinks PARAMS ((void));
static shash_t *allocate_shash PARAMS ((void));
static thash_t *allocate_thash PARAMS ((void));
static tag_t *allocate_tag PARAMS ((void));
static void free_tag PARAMS ((tag_t *ptr));
static forward_t *allocate_forward PARAMS ((void));
static thead_t *allocate_thead PARAMS ((void));
static void free_thead PARAMS ((thead_t *ptr));
static lineno_list_t *allocate_lineno_list PARAMS ((void));
static void generate_ecoff_stab PARAMS ((int, const char *, int, int, int));

/* This function should be called when the assembler starts up.  */

void
ecoff_read_begin_hook ()
{
  tag_hash = hash_new ();
  top_tag_head = allocate_thead ();
  top_tag_head->first_tag = (tag_t *) NULL;
  top_tag_head->free = (thead_t *) NULL;
  top_tag_head->prev = cur_tag_head;
  cur_tag_head = top_tag_head;
}

/* This function should be called when a symbol is created.  */

void
ecoff_symbol_new_hook (symbolP)
     symbolS *symbolP;
{
  /* Make sure that we have a file pointer, but only if we have seen a
     file.  If we haven't seen a file, then this is a probably special
     symbol created by md_begin which may required special handling at
     some point.  Creating a dummy file with a dummy name is certainly
     wrong.  */
  if (cur_file_ptr == (efdr_t *) NULL
      && seen_at_least_1_file ())
    add_file ((const char *) NULL, 0);
  symbolP->ecoff_file = cur_file_ptr;
  symbolP->ecoff_symbol = NULL;
  symbolP->ecoff_extern_size = 0;
}

/* Add a page to a varray object.  */

static void
add_varray_page (vp)
     varray_t *vp;                /* varray to add page to */
{
  vlinks_t *new_links = allocate_vlinks ();

#ifdef MALLOC_CHECK
  if (vp->object_size > 1)
    new_links->datum = (page_t *) xcalloc (1, vp->object_size);
  else
#endif
    new_links->datum = allocate_page ();

  alloc_counts[(int)alloc_type_varray].total_alloc++;
  alloc_counts[(int)alloc_type_varray].total_pages++;

  new_links->start_index = vp->num_allocated;
  vp->objects_last_page = 0;

  if (vp->first == (vlinks_t *) NULL)        /* first allocation? */
    vp->first = vp->last = new_links;
  else
    {                        /* 2nd or greater allocation */
      new_links->prev = vp->last;
      vp->last->next = new_links;
      vp->last = new_links;
    }
}

/* Add a string (and null pad) to one of the string tables.  */

static symint_t
add_string (vp, hash_tbl, str, ret_hash)
     varray_t *vp;            /* string obstack */
     struct hash_control *hash_tbl;    /* ptr to hash table */
     const char *str;            /* string */
     shash_t **ret_hash;        /* return hash pointer */
{
  register unsigned long len = strlen (str);
  register shash_t *hash_ptr;

  if (len >= PAGE_USIZE)
    as_fatal ("String too big (%lu bytes)", len);

  hash_ptr = (shash_t *) hash_find (hash_tbl, str);
  if (hash_ptr == (shash_t *) NULL)
    {
      register const char *err;

      if (vp->objects_last_page + len >= PAGE_USIZE)
        {
          vp->num_allocated =
            ((vp->num_allocated + PAGE_USIZE - 1) / PAGE_USIZE) * PAGE_USIZE;
          add_varray_page (vp);
        }

      hash_ptr = allocate_shash ();
      hash_ptr->indx = vp->num_allocated;

      hash_ptr->string = &vp->last->datum->byte[vp->objects_last_page];

      vp->objects_last_page += len + 1;
      vp->num_allocated += len + 1;

      strcpy (hash_ptr->string, str);

      err = hash_insert (hash_tbl, str, (char *) hash_ptr);
      if (err)
    as_fatal ("Inserting \"%s\" into string hash table: %s",
          str, err);
    }

  if (ret_hash != (shash_t **) NULL)
    *ret_hash = hash_ptr;

  return hash_ptr->indx;
}

/* Add debugging information for a symbol.  */

static localsym_t *
add_ecoff_symbol (str, type, storage, sym_value, value, indx)
     const char *str;            /* symbol name */
     st_t type;                /* symbol type */
     sc_t storage;            /* storage class */
     symbolS *sym_value;        /* associated symbol.  */
     symint_t value;            /* value of symbol */
     symint_t indx;            /* index to local/aux. syms */
{
  localsym_t *psym;
  register scope_t *pscope;
  register thead_t *ptag_head;
  register tag_t *ptag;
  register tag_t *ptag_next;
  register varray_t *vp;
  register int scope_delta = 0;
  shash_t *hash_ptr = (shash_t *) NULL;

  if (cur_file_ptr == (efdr_t *) NULL)
    as_fatal ("no current file pointer");

  vp = &cur_file_ptr->symbols;

 if (vp->objects_last_page == vp->objects_per_page)
    add_varray_page (vp);

  psym = &vp->last->datum->sym[ vp->objects_last_page++ ];

  if (str == (const char *) NULL && sym_value != (symbolS *) NULL)
    psym->name = S_GET_NAME (sym_value);
  else
    psym->name = str;
  psym->as_sym = sym_value;
  if (sym_value != (symbolS *) NULL)
    sym_value->ecoff_symbol = psym;
  psym->file_ptr = cur_file_ptr;
  psym->proc_ptr = cur_proc_ptr;
  psym->begin_ptr = (localsym_t *) NULL;
  psym->index_ptr = (aux_t *) NULL;
  psym->forward_ref = (forward_t *) NULL;
  psym->sym_index = -1;
  memset (&psym->ecoff_sym, 0, sizeof (EXTR));
  psym->ecoff_sym.asym.value = value;
  psym->ecoff_sym.asym.st = (unsigned) type;
  psym->ecoff_sym.asym.sc = (unsigned) storage;
  psym->ecoff_sym.asym.index = indx;

  /* If there is an associated symbol, we wait until the end of the
     assembly before deciding where to put the name (it may be just an
     external symbol).  Otherwise, this is just a debugging symbol and
     the name should go with the current file.  */
  if (sym_value == (symbolS *) NULL)
    psym->ecoff_sym.asym.iss = ((str == (const char *) NULL)
                ? 0
                : add_string (&cur_file_ptr->strings,
                          cur_file_ptr->str_hash,
                          str,
                          &hash_ptr));

  ++vp->num_allocated;

  if (ECOFF_IS_STAB (&psym->ecoff_sym.asym))
    return psym;

  /* Save the symbol within the hash table if this is a static
     item, and it has a name.  */
  if (hash_ptr != (shash_t *) NULL
      && (type == st_Global || type == st_Static || type == st_Label
      || type == st_Proc || type == st_StaticProc))
    hash_ptr->sym_ptr = psym;

  /* push or pop a scope if appropriate.  */
  switch (type)
    {
    default:
      break;

    case st_File:            /* beginning of file */
    case st_Proc:            /* procedure */
    case st_StaticProc:            /* static procedure */
    case st_Block:            /* begin scope */
      pscope = allocate_scope ();
      pscope->prev = cur_file_ptr->cur_scope;
      pscope->lsym = psym;
      pscope->type = type;
      cur_file_ptr->cur_scope = pscope;

      if (type != st_File)
    scope_delta = 1;

      /* For every block type except file, struct, union, or
     enumeration blocks, push a level on the tag stack.  We omit
     file types, so that tags can span file boundaries.  */
      if (type != st_File && storage != sc_Info)
    {
      ptag_head = allocate_thead ();
      ptag_head->first_tag = 0;
      ptag_head->prev = cur_tag_head;
      cur_tag_head = ptag_head;
    }
      break;

    case st_End:
      pscope = cur_file_ptr->cur_scope;
      if (pscope == (scope_t *) NULL)
    as_fatal ("too many st_End's");
      else
    {
      st_t begin_type = (st_t) pscope->lsym->ecoff_sym.asym.st;

      psym->begin_ptr = pscope->lsym;

      if (begin_type != st_File)
        scope_delta = -1;

      /* Except for file, structure, union, or enumeration end
         blocks remove all tags created within this scope.  */
      if (begin_type != st_File && storage != sc_Info)
        {
          ptag_head = cur_tag_head;
          cur_tag_head = ptag_head->prev;

          for (ptag = ptag_head->first_tag;
           ptag != (tag_t *) NULL;
           ptag = ptag_next)
        {
          if (ptag->forward_ref != (forward_t *) NULL)
            add_unknown_tag (ptag);

          ptag_next = ptag->same_block;
          ptag->hash_ptr->tag_ptr = ptag->same_name;
          free_tag (ptag);
        }

          free_thead (ptag_head);
        }

      cur_file_ptr->cur_scope = pscope->prev;

      /* block begin gets next sym #.  This is set when we know
         the symbol index value.  */

      /* Functions push two or more aux words as follows:
         1st word: index+1 of the end symbol (filled in later).
         2nd word: type of the function (plus any aux words needed).
         Also, tie the external pointer back to the function begin symbol.  */
      if (begin_type != st_File && begin_type != st_Block)
        {
          symint_t ty;
          varray_t *svp = &cur_file_ptr->aux_syms;

          pscope->lsym->ecoff_sym.asym.index = add_aux_sym_symint (0);
          pscope->lsym->index_ptr =
        &svp->last->datum->aux[svp->objects_last_page - 1];
          ty = add_aux_sym_tir (&last_func_type_info,
                    hash_no,
                    &cur_file_ptr->thash_head[0]);

/* This seems to be unnecessary.  I'm not even sure what it is
 * intended to do.  It's from mips-tfile.
 *          if (last_func_sym_value != (symbolS *) NULL)
 *        {
 *          last_func_sym_value->ifd = cur_file_ptr->file_index;
 *          last_func_sym_value->index = ty;
 *        }
 */
        }

      free_scope (pscope);
    }
    }

  cur_file_ptr->nested_scopes += scope_delta;

#ifdef ECOFF_DEBUG
  if (debug && type != st_File
      && (debug > 2 || type == st_Block || type == st_End
      || type == st_Proc || type == st_StaticProc))
    {
      char *sc_str = sc_to_string (storage);
      char *st_str = st_to_string (type);
      int depth = cur_file_ptr->nested_scopes + (scope_delta < 0);

      fprintf (stderr,
           "\tlsym\tv= %10ld, depth= %2d, sc= %-12s",
           value, depth, sc_str);

      if (str_start && str_end_p1 - str_start > 0)
    fprintf (stderr, " st= %-11s name= %.*s\n", st_str, str_end_p1 - str_start, str_start);
      else
    {
      unsigned long len = strlen (st_str);
      fprintf (stderr, " st= %.*s\n", len-1, st_str);
    }
    }
#endif

  return psym;
}

/* Add an auxiliary symbol (passing a symint).  This is actually used
   for integral aux types, not just symints.  */

static symint_t
add_aux_sym_symint (aux_word)
     symint_t aux_word;        /* auxiliary information word */
{
  register varray_t *vp;
  register aux_t *aux_ptr;

  if (cur_file_ptr == (efdr_t *) NULL)
    as_fatal ("no current file pointer");

  vp = &cur_file_ptr->aux_syms;

  if (vp->objects_last_page == vp->objects_per_page)
    add_varray_page (vp);

  aux_ptr = &vp->last->datum->aux[vp->objects_last_page++];
  aux_ptr->type = aux_isym;
  aux_ptr->data.isym = aux_word;

  return vp->num_allocated++;
}


/* Add an auxiliary symbol (passing a file/symbol index combo).  */

static symint_t
add_aux_sym_rndx (file_index, sym_index)
     int file_index;
     symint_t sym_index;
{
  register varray_t *vp;
  register aux_t *aux_ptr;

  if (cur_file_ptr == (efdr_t *) NULL)
    as_fatal ("no current file pointer");

  vp = &cur_file_ptr->aux_syms;

  if (vp->objects_last_page == vp->objects_per_page)
    add_varray_page (vp);

  aux_ptr = &vp->last->datum->aux[vp->objects_last_page++];
  aux_ptr->type = aux_rndx;
  aux_ptr->data.rndx.rfd   = file_index;
  aux_ptr->data.rndx.index = sym_index;

  return vp->num_allocated++;
}

/* Add an auxiliary symbol (passing the basic type and possibly
   type qualifiers).  */

static symint_t
add_aux_sym_tir (t, state, hash_tbl)
     type_info_t *t;        /* current type information */
     hash_state_t state;    /* whether to hash type or not */
     thash_t **hash_tbl;    /* pointer to hash table to use */
{
  register varray_t *vp;
  register aux_t *aux_ptr;
  static AUXU init_aux;
  symint_t ret;
  int i;
  AUXU aux;

  if (cur_file_ptr == (efdr_t *) NULL)
    as_fatal ("no current file pointer");

  vp = &cur_file_ptr->aux_syms;

  aux = init_aux;
  aux.ti.bt = (int) t->basic_type;
  aux.ti.continued = 0;
  aux.ti.fBitfield = t->bitfield;

  aux.ti.tq0 = (int) t->type_qualifiers[0];
  aux.ti.tq1 = (int) t->type_qualifiers[1];
  aux.ti.tq2 = (int) t->type_qualifiers[2];
  aux.ti.tq3 = (int) t->type_qualifiers[3];
  aux.ti.tq4 = (int) t->type_qualifiers[4];
  aux.ti.tq5 = (int) t->type_qualifiers[5];


  /* For anything that adds additional information, we must not hash,
     so check here, and reset our state. */

  if (state != hash_no
      && (t->type_qualifiers[0] == tq_Array
      || t->type_qualifiers[1] == tq_Array
      || t->type_qualifiers[2] == tq_Array
      || t->type_qualifiers[3] == tq_Array
      || t->type_qualifiers[4] == tq_Array
      || t->type_qualifiers[5] == tq_Array
      || t->basic_type == bt_Struct
      || t->basic_type == bt_Union
      || t->basic_type == bt_Enum
      || t->bitfield
      || t->num_dims > 0))
    state = hash_no;

  /* See if we can hash this type, and save some space, but some types
     can't be hashed (because they contain arrays or continuations),
     and others can be put into the hash list, but cannot use existing
     types because other aux entries precede this one.  */

  if (state != hash_no)
    {
      register thash_t *hash_ptr;
      register symint_t hi;

      hi = aux.isym & ((1 << HASHBITS) - 1);
      hi %= THASH_SIZE;

      for (hash_ptr = hash_tbl[hi];
       hash_ptr != (thash_t *)0;
       hash_ptr = hash_ptr->next)
    {
      if (aux.isym == hash_ptr->type.isym)
        break;
    }

      if (hash_ptr != (thash_t *) NULL && state == hash_yes)
    return hash_ptr->indx;

      if (hash_ptr == (thash_t *) NULL)
    {
      hash_ptr = allocate_thash ();
      hash_ptr->next = hash_tbl[hi];
      hash_ptr->type = aux;
      hash_ptr->indx = vp->num_allocated;
      hash_tbl[hi] = hash_ptr;
    }
    }

  /* Everything is set up, add the aux symbol. */
  if (vp->objects_last_page == vp->objects_per_page)
    add_varray_page (vp);

  aux_ptr = &vp->last->datum->aux[ vp->objects_last_page++ ];
  aux_ptr->type = aux_tir;
  aux_ptr->data = aux;

  ret = vp->num_allocated++;

  /* Add bitfield length if it exists.

     NOTE:  Mips documentation claims bitfield goes at the end of the
     AUX record, but the DECstation compiler emits it here.
     (This would only make a difference for enum bitfields.)

     Also note:  We use the last size given since gcc may emit 2
     for an enum bitfield.  */

  if (t->bitfield)
    (void) add_aux_sym_symint ((symint_t)t->sizes[t->num_sizes-1]);


  /* Add tag information if needed.  Structure, union, and enum
     references add 2 aux symbols: a [file index, symbol index]
     pointer to the structure type, and the current file index.  */

  if (t->basic_type == bt_Struct
      || t->basic_type == bt_Union
      || t->basic_type == bt_Enum)
    {
      register symint_t file_index = t->tag_ptr->ifd;
      register localsym_t *sym  = t->tag_ptr->sym;
      register forward_t *forward_ref = allocate_forward ();

      if (sym != (localsym_t *) NULL)
    {
      forward_ref->next = sym->forward_ref;
      sym->forward_ref = forward_ref;
    }
      else
    {
      forward_ref->next = t->tag_ptr->forward_ref;
      t->tag_ptr->forward_ref = forward_ref;
    }

      (void) add_aux_sym_rndx (ST_RFDESCAPE, indexNil);
      forward_ref->index_ptr
    = &vp->last->datum->aux[ vp->objects_last_page - 1];

      (void) add_aux_sym_symint (file_index);
      forward_ref->ifd_ptr
    = &vp->last->datum->aux[ vp->objects_last_page - 1];
    }

  /* Add information about array bounds if they exist.  */
  for (i = 0; i < t->num_dims; i++)
    {
      (void) add_aux_sym_rndx (ST_RFDESCAPE,
                   cur_file_ptr->int_type);

      (void) add_aux_sym_symint (cur_file_ptr->file_index);    /* file index*/
      (void) add_aux_sym_symint ((symint_t) 0);            /* low bound */
      (void) add_aux_sym_symint (t->dimensions[i] - 1);        /* high bound*/
      (void) add_aux_sym_symint ((t->dimensions[i] == 0)    /* stride */
                 ? 0
                 : (t->sizes[i] * 8) / t->dimensions[i]);
    };

  /* NOTE:  Mips documentation claims that the bitfield width goes here.
     But it needs to be emitted earlier. */

  return ret;
}

/* Add a tag to the tag table (unless it already exists).  */

static tag_t *
get_tag (tag, sym, basic_type)
     const char *tag;            /* tag name */
     localsym_t *sym;            /* tag start block */
     bt_t basic_type;            /* bt_Struct, bt_Union, or bt_Enum */
{
  shash_t *hash_ptr;
  const char *err;
  tag_t *tag_ptr;

  if (cur_file_ptr == (efdr_t *) NULL)
    as_fatal ("no current file pointer");

  hash_ptr = (shash_t *) hash_find (tag_hash, tag);

  if (hash_ptr != (shash_t *) NULL
      && hash_ptr->tag_ptr != (tag_t *) NULL)
  {
    tag_ptr = hash_ptr->tag_ptr;
    if (sym != (localsym_t *) NULL)
      {
    tag_ptr->basic_type = basic_type;
    tag_ptr->ifd        = cur_file_ptr->file_index;
    tag_ptr->sym        = sym;
      }
    return tag_ptr;
  }

  if (hash_ptr == (shash_t *) NULL)
    {
      char *perm;

      perm = xmalloc ((unsigned long) (strlen (tag) + 1));
      strcpy (perm, tag);
      hash_ptr = allocate_shash ();
      err = hash_insert (tag_hash, perm, (char *) hash_ptr);
      if (err)
    as_fatal ("Inserting \"%s\" into tag hash table: %s",
          tag, err);
      hash_ptr->string = perm;
    }

  tag_ptr = allocate_tag ();
  tag_ptr->forward_ref    = (forward_t *) NULL;
  tag_ptr->hash_ptr    = hash_ptr;
  tag_ptr->same_name    = hash_ptr->tag_ptr;
  tag_ptr->basic_type    = basic_type;
  tag_ptr->sym        = sym;
  tag_ptr->ifd        = ((sym == (localsym_t *) NULL)
               ? (symint_t) -1
               : cur_file_ptr->file_index);
  tag_ptr->same_block    = cur_tag_head->first_tag;

  cur_tag_head->first_tag = tag_ptr;
  hash_ptr->tag_ptr      = tag_ptr;

  return tag_ptr;
}

/* Add an unknown {struct, union, enum} tag.  */

static void
add_unknown_tag (ptag)
     tag_t    *ptag;        /* pointer to tag information */
{
  shash_t *hash_ptr    = ptag->hash_ptr;
  char *name        = hash_ptr->string;
  localsym_t *sym;
  forward_t **pf;

#ifdef ECOFF_DEBUG
  if (debug > 1)
    {
      char *agg_type    = "{unknown aggregate type}";
      switch (ptag->basic_type)
    {
    case bt_Struct:    agg_type = "struct";    break;
    case bt_Union:    agg_type = "union";    break;
    case bt_Enum:    agg_type = "enum";    break;
    default:                break;
    }

      fprintf (stderr, "unknown %s %.*s found\n", agg_type,
           hash_ptr->len, name_start);
    }
#endif

  sym = add_ecoff_symbol (name,
              st_Block,
              sc_Info,
              (symbolS *) NULL,
              (symint_t) 0,
              (symint_t) 0);

  (void) add_ecoff_symbol (name,
               st_End,
               sc_Info,
               (symbolS *) NULL,
               (symint_t) 0,
               (symint_t) 0);

  for (pf = &sym->forward_ref; *pf != (forward_t *) NULL; pf = &(*pf)->next)
    ;
  *pf = ptag->forward_ref;
}

/* Add a procedure to the current file's list of procedures, and record
   this is the current procedure.  */

static void
add_procedure (func)
     char *func;            /* func name */
{
  register varray_t *vp;
  register proc_t *new_proc_ptr;

#ifdef ECOFF_DEBUG
  if (debug)
    fputc ('\n', stderr);
#endif

  if (cur_file_ptr == (efdr_t *) NULL)
    as_fatal ("no current file pointer");

  vp = &cur_file_ptr->procs;

  if (vp->objects_last_page == vp->objects_per_page)
    add_varray_page (vp);

  cur_proc_ptr = new_proc_ptr = &vp->last->datum->proc[vp->objects_last_page++];

  if (first_proc_ptr == (proc_t *) NULL)
    first_proc_ptr = new_proc_ptr;

  vp->num_allocated++;

  new_proc_ptr->pdr.isym = -1;
  new_proc_ptr->pdr.iline = -1;
  new_proc_ptr->pdr.lnLow = -1;
  new_proc_ptr->pdr.lnHigh = -1;

  /* Push the start of the function.  */
  new_proc_ptr->sym = add_ecoff_symbol ((const char *) NULL, st_Proc, sc_Text,
                    symbol_find_or_make (func),
                    (symint_t) 0, (symint_t) 0);

  ++proc_cnt;

  /* Fill in the linenos preceding the .ent, if any.  */
  if (noproc_lineno != (lineno_list_t *) NULL)
    {
      lineno_list_t *l;

      for (l = noproc_lineno; l != (lineno_list_t *) NULL; l = l->next)
    l->proc = new_proc_ptr;
      *last_lineno_ptr = noproc_lineno;
      while (*last_lineno_ptr != NULL)
    last_lineno_ptr = &(*last_lineno_ptr)->next;
      noproc_lineno = (lineno_list_t *) NULL;
    }
}

/* Add a new filename, and set up all of the file relative
   virtual arrays (strings, symbols, aux syms, etc.).  Record
   where the current file structure lives.  */

static void
add_file (file_name, indx)
     const char *file_name;        /* file name */
     int indx;
{
  register int first_ch;
  register efdr_t *fil_ptr;

#ifdef ECOFF_DEBUG
  if (debug)
    fprintf (stderr, "\tfile\t%.*s\n", len, file_start);
#endif

  /* If the file name is NULL, then no .file symbol appeared, and we
     want to use the actual file name.  */
  if (file_name == (const char *) NULL)
    {
      char *file;

      if (first_file != (efdr_t *) NULL)
    as_fatal ("fake .file after real one");
      as_where (&file, (unsigned int *) NULL);
      file_name = (const char *) file;

      if (! symbol_table_frozen)
    generate_asm_lineno = 1;
    }
  else
      generate_asm_lineno = 0;

#ifndef NO_LISTING
  if (listing)
    listing_source_file (file_name);
#endif

  current_stabs_filename = file_name;

  /* If we're creating stabs, then we don't actually make a new FDR.
     Instead, we just create a stabs symbol.  */
  if (stabs_seen)
    {
      (void) add_ecoff_symbol (file_name, st_Nil, sc_Nil,
                   symbol_new ("L0\001", now_seg,
                       (valueT) frag_now_fix (),
                       frag_now),
                   0, ECOFF_MARK_STAB (N_SOL));
      return;
    }

  first_ch = *file_name;

  /* See if the file has already been created.  */
  for (fil_ptr = first_file;
       fil_ptr != (efdr_t *) NULL;
       fil_ptr = fil_ptr->next_file)
    {
      if (first_ch == fil_ptr->name[0]
      && strcmp (file_name, fil_ptr->name) == 0)
    {
      cur_file_ptr = fil_ptr;
      break;
    }
    }

  /* If this is a new file, create it. */
  if (fil_ptr == (efdr_t *) NULL)
    {
      if (file_desc.objects_last_page == file_desc.objects_per_page)
    add_varray_page (&file_desc);

      fil_ptr = cur_file_ptr =
    &file_desc.last->datum->file[file_desc.objects_last_page++];
      *fil_ptr = init_file;

      fil_ptr->file_index = current_file_idx++;
      ++file_desc.num_allocated;

      /* Allocate the string hash table.  */
      fil_ptr->str_hash = hash_new ();

      /* Make sure 0 byte in string table is null  */
      add_string (&fil_ptr->strings,
          fil_ptr->str_hash,
          "",
          (shash_t **)0);

      if (strlen (file_name) > PAGE_USIZE - 2)
    as_fatal ("Filename goes over one page boundary.");

      /* Push the start of the filename. We assume that the filename
         will be stored at string offset 1.  */
      (void) add_ecoff_symbol (file_name, st_File, sc_Text,
                   (symbolS *) NULL,
                   (symint_t) 0, (symint_t) 0);
      fil_ptr->fdr.rss = 1;
      fil_ptr->name = &fil_ptr->strings.last->datum->byte[1];

      /* Update the linked list of file descriptors.  */
      *last_file_ptr = fil_ptr;
      last_file_ptr = &fil_ptr->next_file;

      /* Add void & int types to the file (void should be first to catch
     errant 0's within the index fields).  */
      fil_ptr->void_type = add_aux_sym_tir (&void_type_info,
                        hash_yes,
                        &cur_file_ptr->thash_head[0]);

      fil_ptr->int_type = add_aux_sym_tir (&int_type_info,
                       hash_yes,
                       &cur_file_ptr->thash_head[0]);
      /* gas used to have a bug that if the file does not have any
     symbol, it either will abort or will not build the file,
     the following is to get around that problem. ---kung*/
#if 0
      if (generate_asm_lineno)
    {
      mark_stabs (0);
          (void) add_ecoff_symbol (file_name, st_Nil, sc_Nil,
                   symbol_new ("L0\001", now_seg,
                           (valueT) frag_now_fix (),
                           frag_now),
                   0, ECOFF_MARK_STAB (N_SO));
          (void) add_ecoff_symbol ("void:t1=1", st_Nil, sc_Nil,
                   (symbolS *) NULL, 0,
                   ECOFF_MARK_STAB (N_LSYM));
    }
#endif
    }
}

#ifdef ECOFF_DEBUG

/* Convert storage class to string.  */

static char *
sc_to_string(storage_class)
     sc_t storage_class;
{
  switch(storage_class)
    {
    case sc_Nil:     return "Nil,";
    case sc_Text:     return "Text,";
    case sc_Data:     return "Data,";
    case sc_Bss:     return "Bss,";
    case sc_Register:     return "Register,";
    case sc_Abs:     return "Abs,";
    case sc_Undefined:     return "Undefined,";
    case sc_CdbLocal:     return "CdbLocal,";
    case sc_Bits:     return "Bits,";
    case sc_CdbSystem:     return "CdbSystem,";
    case sc_RegImage:     return "RegImage,";
    case sc_Info:     return "Info,";
    case sc_UserStruct:     return "UserStruct,";
    case sc_SData:     return "SData,";
    case sc_SBss:     return "SBss,";
    case sc_RData:     return "RData,";
    case sc_Var:     return "Var,";
    case sc_Common:     return "Common,";
    case sc_SCommon:     return "SCommon,";
    case sc_VarRegister: return "VarRegister,";
    case sc_Variant:     return "Variant,";
    case sc_SUndefined:     return "SUndefined,";
    case sc_Init:     return "Init,";
    case sc_Max:     return "Max,";
    }

  return "???,";
}

#endif /* DEBUG */

#ifdef ECOFF_DEBUG

/* Convert symbol type to string.  */

static char *
st_to_string(symbol_type)
     st_t symbol_type;
{
  switch(symbol_type)
    {
    case st_Nil:    return "Nil,";
    case st_Global:    return "Global,";
    case st_Static:    return "Static,";
    case st_Param:    return "Param,";
    case st_Local:    return "Local,";
    case st_Label:    return "Label,";
    case st_Proc:    return "Proc,";
    case st_Block:    return "Block,";
    case st_End:    return "End,";
    case st_Member:    return "Member,";
    case st_Typedef:    return "Typedef,";
    case st_File:    return "File,";
    case st_RegReloc:    return "RegReloc,";
    case st_Forward:    return "Forward,";
    case st_StaticProc:    return "StaticProc,";
    case st_Constant:    return "Constant,";
    case st_Str:    return "String,";
    case st_Number:    return "Number,";
    case st_Expr:    return "Expr,";
    case st_Type:    return "Type,";
    case st_Max:    return "Max,";
    }

  return "???,";
}

#endif /* DEBUG */

/* Parse .begin directives which have a label as the first argument
   which gives the location of the start of the block.  */

void
ecoff_directive_begin (ignore)
     int ignore;
{
  char *name;
  char name_end;

  if (cur_file_ptr == (efdr_t *) NULL)
    {
      as_warn (".begin directive without a preceding .file directive");
      demand_empty_rest_of_line ();
      return;
    }

  if (cur_proc_ptr == (proc_t *) NULL)
    {
      as_warn (".begin directive without a preceding .ent directive");
      demand_empty_rest_of_line ();
      return;
    }

  name = input_line_pointer;
  name_end = get_symbol_end ();

  (void) add_ecoff_symbol ((const char *) NULL, st_Block, sc_Text,
               symbol_find_or_make (name),
               (symint_t) 0, (symint_t) 0);

  *input_line_pointer = name_end;

  /* The line number follows, but we don't use it.  */
  (void) get_absolute_expression ();
  demand_empty_rest_of_line ();
}

/* Parse .bend directives which have a label as the first argument
   which gives the location of the end of the block.  */

void
ecoff_directive_bend (ignore)
     int ignore;
{
  char *name;
  char name_end;
  symbolS *endsym;

  if (cur_file_ptr == (efdr_t *) NULL)
    {
      as_warn (".bend directive without a preceding .file directive");
      demand_empty_rest_of_line ();
      return;
    }

  if (cur_proc_ptr == (proc_t *) NULL)
    {
      as_warn (".bend directive without a preceding .ent directive");
      demand_empty_rest_of_line ();
      return;
    }

  name = input_line_pointer;
  name_end = get_symbol_end ();

  /* The value is the distance between the .bend directive and the
     corresponding symbol.  We fill in the offset when we write out
     the symbol.  */
  endsym = symbol_find (name);
  if (endsym == (symbolS *) NULL)
    as_warn (".bend directive names unknown symbol");
  else
    (void) add_ecoff_symbol ((const char *) NULL, st_End, sc_Text, endsym,
                 (symint_t) 0, (symint_t) 0);

  *input_line_pointer = name_end;

  /* The line number follows, but we don't use it.  */
  (void) get_absolute_expression ();
  demand_empty_rest_of_line ();
}

/* COFF debugging information is provided as a series of directives
   (.def, .scl, etc.).  We build up information as we read the
   directives in the following static variables, and file it away when
   we reach the .endef directive.  */
static char *coff_sym_name;
static type_info_t coff_type;
static sc_t coff_storage_class;
static st_t coff_symbol_typ;
static int coff_is_function;
static char *coff_tag;
static valueT coff_value;
symbolS *coff_sym_value;
static int coff_inside_enumeration;

/* Handle a .def directive: start defining a symbol.  */

void
ecoff_directive_def (ignore)
     int ignore;
{
  char *name;
  char name_end;

  SKIP_WHITESPACE ();

  name = input_line_pointer;
  name_end = get_symbol_end ();

  if (coff_sym_name != (char *) NULL)
    as_warn (".def pseudo-op used inside of .def/.endef; ignored");
  else if (*name == '\0')
    as_warn ("Empty symbol name in .def; ignored");
  else
    {
      if (coff_sym_name != (char *) NULL)
    free (coff_sym_name);
      if (coff_tag != (char *) NULL)
    free (coff_tag);
      coff_sym_name = (char *) xmalloc ((unsigned long) (strlen (name) + 1));
      strcpy (coff_sym_name, name);
      coff_type = type_info_init;
      coff_storage_class = sc_Nil;
      coff_symbol_typ = st_Nil;
      coff_is_function = 0;
      coff_tag = (char *) NULL;
      coff_value = 0;
      coff_sym_value = (symbolS *) NULL;
    }

  *input_line_pointer = name_end;

  demand_empty_rest_of_line ();
}

/* Handle a .dim directive, used to give dimensions for an array.  The
   arguments are comma separated numbers.  mips-tfile assumes that
   there will not be more than 6 dimensions, and gdb won't read any
   more than that anyhow, so I will also make that assumption.  */

void
ecoff_directive_dim (ignore)
     int ignore;
{
  int dimens[N_TQ];
  int i;

  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".dim pseudo-op used outside of .def/.endef; ignored");
      demand_empty_rest_of_line ();
      return;
    }

  for (i = 0; i < N_TQ; i++)
    {
      SKIP_WHITESPACE ();
      dimens[i] = get_absolute_expression ();
      if (*input_line_pointer == ',')
    ++input_line_pointer;
      else
    {
      if (*input_line_pointer != '\n'
          && *input_line_pointer != ';')
        as_warn ("Badly formed .dim directive");
      break;
    }
    }

  if (i == N_TQ)
    --i;

  /* The dimensions are stored away in reverse order.  */
  for (; i >= 0; i--)
    {
      if (coff_type.num_dims >= N_TQ)
    {
      as_warn ("Too many .dim entries");
      break;
    }
      coff_type.dimensions[coff_type.num_dims] = dimens[i];
      ++coff_type.num_dims;
    }

  demand_empty_rest_of_line ();
}

/* Handle a .scl directive, which sets the COFF storage class of the
   symbol.  */

void
ecoff_directive_scl (ignore)
     int ignore;
{
  long val;

  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".scl pseudo-op used outside of .def/.endef; ignored");
      demand_empty_rest_of_line ();
      return;
    }

  val = get_absolute_expression ();

  coff_symbol_typ = map_coff_sym_type[val];
  coff_storage_class = map_coff_storage[val];

  demand_empty_rest_of_line ();
}

/* Handle a .size directive.  For some reason mips-tfile.c thinks that
   .size can have multiple arguments.  We humor it, although gcc will
   never generate more than one argument.  */

void
ecoff_directive_size (ignore)
     int ignore;
{
  int sizes[N_TQ];
  int i;

  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".size pseudo-op used outside of .def/.endef; ignored");
      demand_empty_rest_of_line ();
      return;
    }

  for (i = 0; i < N_TQ; i++)
    {
      SKIP_WHITESPACE ();
      sizes[i] = get_absolute_expression ();
      if (*input_line_pointer == ',')
    ++input_line_pointer;
      else
    {
      if (*input_line_pointer != '\n'
          && *input_line_pointer != ';')
        as_warn ("Badly formed .size directive");
      break;
    }
    }

  if (i == N_TQ)
    --i;

  /* The sizes are stored away in reverse order.  */
  for (; i >= 0; i--)
    {
      if (coff_type.num_sizes >= N_TQ)
    {
      as_warn ("Too many .size entries");
      break;
    }
      coff_type.sizes[coff_type.num_sizes] = sizes[i];
      ++coff_type.num_sizes;
    }

  demand_empty_rest_of_line ();
}

/* Handle the .type directive, which gives the COFF type of the
   symbol.  */

void
ecoff_directive_type (ignore)
     int ignore;
{
  long val;
  tq_t *tq_ptr;
  tq_t *tq_shft;

  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".type pseudo-op used outside of .def/.endef; ignored");
      demand_empty_rest_of_line ();
      return;
    }

  val = get_absolute_expression ();

  coff_type.orig_type = BTYPE (val);
  coff_type.basic_type = map_coff_types[coff_type.orig_type];

  tq_ptr = &coff_type.type_qualifiers[N_TQ];
  while (val &~ N_BTMASK)
    {
      if (tq_ptr == &coff_type.type_qualifiers[0])
    {
      as_warn ("Too derived values in .type argument");
      break;
    }
      if (ISPTR (val))
    *--tq_ptr = tq_Ptr;
      else if (ISFCN (val))
    *--tq_ptr = tq_Proc;
      else if (ISARY (val))
    *--tq_ptr = tq_Array;
      else
    as_fatal ("Unrecognized .type argument");

      val = DECREF (val);
    }

  tq_shft = &coff_type.type_qualifiers[0];
  while (tq_ptr != &coff_type.type_qualifiers[N_TQ])
    *tq_shft++ = *tq_ptr++;

  if (tq_shft != &coff_type.type_qualifiers[0] && tq_shft[-1] == tq_Proc)
    {
      /* If this is a function, ignore it, so that we don't get two
     entries (one from the .ent, and one for the .def that
     precedes it).  Save the type information so that the end
     block can properly add it after the begin block index.  For
     MIPS knows what reason, we must strip off the function type
     at this point.  */
      coff_is_function = 1;
      tq_shft[-1] = tq_Nil;
    }

  while (tq_shft != &coff_type.type_qualifiers[N_TQ])
    *tq_shft++ = tq_Nil;

  demand_empty_rest_of_line ();
}

/* Handle the .tag directive, which gives the name of a structure,
   union or enum.  */

void
ecoff_directive_tag (ignore)
     int ignore;
{
  char *name;
  char name_end;

  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".tag pseudo-op used outside of .def/.endef; ignored");
      demand_empty_rest_of_line ();
      return;
    }

  name = input_line_pointer;
  name_end = get_symbol_end ();

  coff_tag = (char *) xmalloc ((unsigned long) (strlen (name) + 1));
  strcpy (coff_tag, name);

  *input_line_pointer = name_end;

  demand_empty_rest_of_line ();
}

/* Handle the .val directive, which gives the value of the symbol.  It
   may be the name of a static or global symbol.  */

void
ecoff_directive_val (ignore)
     int ignore;
{
  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".val pseudo-op used outside of .def/.endef; ignored");
      demand_empty_rest_of_line ();
      return;
    }

  if (! is_name_beginner ((unsigned char) *input_line_pointer))
    coff_value = get_absolute_expression ();
  else
    {
      char *name;
      char name_end;

      name = input_line_pointer;
      name_end = get_symbol_end ();

      if (strcmp (name, ".") == 0)
    as_warn ("`.val .' not supported");
      else
    coff_sym_value = symbol_find_or_make (name);

      *input_line_pointer = name_end;

      /* FIXME: gcc can generate address expressions here in unusual
     cases (search for "obscure" in sdbout.c), although this is
     very unlikely for a MIPS chip.  */
    }

  demand_empty_rest_of_line ();
}

/* Handle the .endef directive, which terminates processing of COFF
   debugging information for a symbol.  */

void
ecoff_directive_endef (ignore)
     int ignore;
{
  char *name;
  symint_t indx;
  localsym_t *sym;

  demand_empty_rest_of_line ();

  if (coff_sym_name == (char *) NULL)
    {
      as_warn (".endef pseudo-op used before .def; ignored");
      return;
    }

  name = coff_sym_name;
  coff_sym_name = (char *) NULL;

  /* If the symbol is a static or external, we have already gotten the
     appropriate type and class, so make sure we don't override those
     values.  This is needed because there are some type and classes
     that are not in COFF, such as short data, etc.  */
  if (coff_sym_value != (symbolS *) NULL)
    {
      coff_symbol_typ = st_Nil;
      coff_storage_class = sc_Nil;
    }

  coff_type.extra_sizes = coff_tag != (char *) NULL;
  if (coff_type.num_dims > 0)
    {
      int diff = coff_type.num_dims - coff_type.num_sizes;
      int i = coff_type.num_dims - 1;
      int j;

      if (coff_type.num_sizes != 1 || diff < 0)
    {
      as_warn ("Bad COFF debugging info");
      return;
    }

      /* If this is an array, make sure the same number of dimensions
     and sizes were passed, creating extra sizes for multiply
     dimensioned arrays if not passed.  */
      coff_type.extra_sizes = 0;
      if (diff)
    {
      j = (sizeof (coff_type.sizes) / sizeof (coff_type.sizes[0])) - 1;
      while (j >= 0)
        {
          coff_type.sizes[j] = (((j - diff) >= 0)
                    ? coff_type.sizes[j - diff]
                    : 0);
          j--;
        }

      coff_type.num_sizes = i + 1;
      for (i--; i >= 0; i--)
        coff_type.sizes[i] = (coff_type.sizes[i + 1]
                  / coff_type.dimensions[i + 1]);
    }
    }
  else if (coff_symbol_typ == st_Member
       && coff_type.num_sizes - coff_type.extra_sizes == 1)
    {
      /* Is this a bitfield?  This is indicated by a structure memeber
     having a size field that isn't an array.  */
      coff_type.bitfield = 1;
    }

  /* Except for enumeration members & begin/ending of scopes, put the
     type word in the aux. symbol table.  */
  if (coff_symbol_typ == st_Block || coff_symbol_typ == st_End)
    indx = 0;
  else if (coff_inside_enumeration)
    indx = cur_file_ptr->void_type;
  else
    {
      if (coff_type.basic_type == bt_Struct
      || coff_type.basic_type == bt_Union
      || coff_type.basic_type == bt_Enum)
    {
      if (coff_tag == (char *) NULL)
        {
          as_warn ("No tag specified for %s", name);
          return;
        }

      coff_type.tag_ptr = get_tag (coff_tag, (localsym_t *) NULL,
                       coff_type.basic_type);
    }

      if (coff_is_function)
    {
      last_func_type_info = coff_type;
      last_func_sym_value = coff_sym_value;
      return;
    }

      indx = add_aux_sym_tir (&coff_type,
                  hash_yes,
                  &cur_file_ptr->thash_head[0]);
    }

  /* Do any last minute adjustments that are necessary.  */
  switch (coff_symbol_typ)
    {
    default:
      break;

      /* For the beginning of structs, unions, and enumerations, the
     size info needs to be passed in the value field.  */
    case st_Block:
      if (coff_type.num_sizes - coff_type.num_dims - coff_type.extra_sizes
      != 1)
    {
      as_warn ("Bad COFF debugging information");
      return;
    }
      else
    coff_value = coff_type.sizes[0];

      coff_inside_enumeration = (coff_type.orig_type == T_ENUM);
      break;

      /* For the end of structs, unions, and enumerations, omit the
     name which is always ".eos".  This needs to be done last, so
     that any error reporting above gives the correct name.  */
    case st_End:
      free (name);
      name = (char *) NULL;
      coff_value = 0;
      coff_inside_enumeration = 0;
      break;

      /* Members of structures and unions that aren't bitfields, need
     to adjust the value from a byte offset to a bit offset.
     Members of enumerations do not have the value adjusted, and
     can be distinguished by indx == indexNil.  For enumerations,
     update the maximum enumeration value.  */
    case st_Member:
      if (! coff_type.bitfield && ! coff_inside_enumeration)
    coff_value *= 8;

      break;
    }

  /* Add the symbol.  */
  sym = add_ecoff_symbol (name,
              coff_symbol_typ,
              coff_storage_class,
              coff_sym_value,
              (symint_t) coff_value,
              indx);

  /* deal with struct, union, and enum tags.  */
  if (coff_symbol_typ == st_Block)
    {
      /* Create or update the tag information.  */
      tag_t *tag_ptr = get_tag (name,
                sym,
                coff_type.basic_type);
      forward_t **pf;

      /* Remember any forward references.  */
      for (pf = &sym->forward_ref;
       *pf != (forward_t *) NULL;
       pf = &(*pf)->next)
    ;
      *pf = tag_ptr->forward_ref;
      tag_ptr->forward_ref = (forward_t *) NULL;
    }
}

/* Parse .end directives.  */

void
ecoff_directive_end (ignore)
     int ignore;
{
  char *name;
  char name_end;
  register int ch;
  symbolS *ent;

  if (cur_file_ptr == (efdr_t *) NULL)
    {
      as_warn (".end directive without a preceding .file directive");
      demand_empty_rest_of_line ();
      return;
    }

  if (cur_proc_ptr == (proc_t *) NULL)
    {
      as_warn (".end directive without a preceding .ent directive");
      demand_empty_rest_of_line ();
      return;
    }

  name = input_line_pointer;
  name_end = get_symbol_end ();

  ch = *name;
  if (! is_name_beginner (ch))
    {
      as_warn (".end directive has no name");
      *input_line_pointer = name_end;
      demand_empty_rest_of_line ();
      return;
    }

  /* The value is the distance between the .end directive and the
     corresponding symbol.  We create a fake symbol to hold the
     current location, and put in the offset when we write out the
     symbol.  */
  ent = symbol_find (name);
  if (ent == (symbolS *) NULL)
    as_warn (".end directive names unknown symbol");
  else
    {
      (void) add_ecoff_symbol ((const char *) NULL, st_End, sc_Text,
                 symbol_new ("L0\001", now_seg,
                     (valueT) frag_now_fix (),
                     frag_now),
                 (symint_t) 0, (symint_t) 0);

      if (stabs_seen && generate_asm_lineno)
    {
    char *n;

      n = xmalloc (strlen (name) + 4);
      strcpy (n, name);
      strcat (n, ":F1");
      (void) add_ecoff_symbol ((const char *) n, stGlobal, scText,
                ent, 0, ECOFF_MARK_STAB (N_FUN));
    }
    }

  cur_proc_ptr = (proc_t *) NULL;

  *input_line_pointer = name_end;
  demand_empty_rest_of_line ();
}

/* Parse .ent directives.  */

void
ecoff_directive_ent (ignore)
     int ignore;
{
  char *name;
  char name_end;
  register int ch;

  if (cur_file_ptr == (efdr_t *) NULL)
    add_file ((const char *) NULL, 0);

  if (cur_proc_ptr != (proc_t *) NULL)
    {
      as_warn ("second .ent directive found before .end directive");
      demand_empty_rest_of_line ();
      return;
    }

  name = input_line_pointer;
  name_end = get_symbol_end ();

  ch = *name;
  if (! is_name_beginner (ch))
    {
      as_warn (".ent directive has no name");
      *input_line_pointer = name_end;
      demand_empty_rest_of_line ();
      return;
    }

  add_procedure (name);

  *input_line_pointer = name_end;

  /* The .ent directive is sometimes followed by a number.  I'm not
     really sure what the number means.  I don't see any way to store
     the information in the PDR.  The Irix 4 assembler seems to ignore
     the information.  */
  SKIP_WHITESPACE ();
  if (*input_line_pointer == ',')
    {
      ++input_line_pointer;
      SKIP_WHITESPACE ();
    }
  if (isdigit (*input_line_pointer) || *input_line_pointer == '-')
    (void) get_absolute_expression ();

  demand_empty_rest_of_line ();
}

/* Parse .file directives.  */

void
ecoff_directive_file (ignore)
     int ignore;
{
  int indx;
  char *name;
  int len;

  if (cur_proc_ptr != (proc_t *) NULL)
    {
      as_warn ("No way to handle .file within .ent/.end section");
      demand_empty_rest_of_line ();
      return;
    }

  indx = (int) get_absolute_expression ();

  /* FIXME: we don't have to save the name here.  */
  name = demand_copy_C_string (&len);

  add_file (name, indx - 1);

  demand_empty_rest_of_line ();
}

/* Parse .fmask directives.  */

void
ecoff_directive_fmask (ignore)
     int ignore;
{
  long val;

  if (cur_proc_ptr == (proc_t *) NULL)
    {
      as_warn (".fmask outside of .ent");
      demand_empty_rest_of_line ();
      return;
    }

  if (get_absolute_expression_and_terminator (&val) != ',')
    {
      as_warn ("Bad .fmask directive");
      --input_line_pointer;
      demand_empty_rest_of_line ();
      return;
    }

  cur_proc_ptr->pdr.fregmask = val;
  cur_proc_ptr->pdr.fregoffset = get_absolute_expression ();

  demand_empty_rest_of_line ();
}

/* Parse .frame directives.  */

void
ecoff_directive_frame (ignore)
     int ignore;
{
  long val;

  if (cur_proc_ptr == (proc_t *) NULL)
    {
      as_warn (".frame outside of .ent");
      demand_empty_rest_of_line ();
      return;
    }

  cur_proc_ptr->pdr.framereg = tc_get_register (1);

  SKIP_WHITESPACE ();
  if (*input_line_pointer++ != ','
      || get_absolute_expression_and_terminator (&val) != ',')
    {
      as_warn ("Bad .frame directive");
      --input_line_pointer;
      demand_empty_rest_of_line ();
      return;
    }

  cur_proc_ptr->pdr.frameoffset = val;

  cur_proc_ptr->pdr.pcreg = tc_get_register (0);

#if 0 /* Alpha-OSF1 adds "the offset of saved $a0 from $sp", according
     to Sandro.  I don't yet know where this value should be stored, if
     anywhere.  */
  demand_empty_rest_of_line ();
#else
  s_ignore (42);
#endif
}

/* Parse .mask directives.  */

void
ecoff_directive_mask (ignore)
     int ignore;
{
  long val;

  if (cur_proc_ptr == (proc_t *) NULL)
    {
      as_warn (".mask outside of .ent");
      demand_empty_rest_of_line ();
      return;
    }

  if (get_absolute_expression_and_terminator (&val) != ',')
    {
      as_warn ("Bad .mask directive");
      --input_line_pointer;
      demand_empty_rest_of_line ();
      return;
    }

  cur_proc_ptr->pdr.regmask = val;
  cur_proc_ptr->pdr.regoffset = get_absolute_expression ();

  demand_empty_rest_of_line ();
}

/* Parse .loc directives.  */

void
ecoff_directive_loc (ignore)
     int ignore;
{
  lineno_list_t *list;
  symint_t lineno;

  if (cur_file_ptr == (efdr_t *) NULL)
    {
      as_warn (".loc before .file");
      demand_empty_rest_of_line ();
      return;
    }

  if (now_seg != text_section)
    {
      as_warn (".loc outside of .text");
      demand_empty_rest_of_line ();
      return;
    }

  /* Skip the file number.  */
  SKIP_WHITESPACE ();
  get_absolute_expression ();
  SKIP_WHITESPACE ();

  lineno = get_absolute_expression ();

#ifndef NO_LISTING
  if (listing)
    listing_source_line (lineno);
#endif

  /* If we're building stabs, then output a special label rather than
     ECOFF line number info.  */
  if (stabs_seen)
    {
      (void) add_ecoff_symbol ((char *) NULL, st_Label, sc_Text,
                   symbol_new ("L0\001", now_seg,
                       (valueT) frag_now_fix (),
                       frag_now),
                   0, lineno);
      return;
    }

  list = allocate_lineno_list ();

  list->next = (lineno_list_t *) NULL;
  list->file = cur_file_ptr;
  list->proc = cur_proc_ptr;
  list->frag = frag_now;
  list->paddr = frag_now_fix ();
  list->lineno = lineno;

  /* A .loc directive will sometimes appear before a .ent directive,
     which means that cur_proc_ptr will be NULL here.  Arrange to
     patch this up.  */
  if (cur_proc_ptr == (proc_t *) NULL)
    {
      lineno_list_t **pl;

      pl = &noproc_lineno;
      while (*pl != (lineno_list_t *) NULL)
    pl = &(*pl)->next;
      *pl = list;
    }
  else
    {
      *last_lineno_ptr = list;
      last_lineno_ptr = &list->next;
    }
}

/* Make sure the @stabs symbol is emitted.  */

static void
mark_stabs (ignore)
     int ignore;
{
  if (! stabs_seen)
    {
      /* Add a dummy @stabs dymbol. */
      stabs_seen = 1;
      (void) add_ecoff_symbol (stabs_symbol, stNil, scInfo,
                   (symbolS *) NULL,
                   (symint_t) -1, ECOFF_MARK_STAB (0));
    }
}

/* Handle .stabs directives.  The actual parsing routine is done by a
   generic routine.  This routine is called via OBJ_PROCESS_STAB.
   When this is called, input_line_pointer will be pointing at the
   value field of the stab.

   .stabs directives have five fields:
    "string"    a string, encoding the type information.
    code        a numeric code, defined in <stab.h>
    0        a zero
    desc        a zero or line number
    value        a numeric value or an address.

    If the value is relocatable, we transform this into:
    iss        points as an index into string space
    value        value from lookup of the name
    st        st from lookup of the name
    sc        sc from lookup of the name
    index        code|CODE_MASK

    If the value is not relocatable, we transform this into:
    iss        points as an index into string space
    value        value
    st        st_Nil
    sc        sc_Nil
    index        code|CODE_MASK

    .stabn directives have four fields (string is null):
    code        a numeric code, defined in <stab.h>
    0        a zero
    desc        a zero or a line number
    value        a numeric value or an address.  */

void
ecoff_stab (what, string, type, other, desc)
     int what;
     const char *string;
     int type;
     int other;
     int desc;
{
  efdr_t *save_file_ptr = cur_file_ptr;
  symbolS *sym;
  symint_t value;
  st_t st;
  sc_t sc;
  symint_t indx;
  localsym_t *hold = NULL;

  /* We don't handle .stabd.  */
  if (what != 's' && what != 'n')
    {
      as_bad (".stab%c is not supported", what);
      return;
    }

  /* A .stabn uses a null name, not an empty string.  */
  if (what == 'n')
    string = NULL;

  /* We ignore the other field.  */
  if (other != 0)
    as_warn (".stab%c: ignoring non-zero other field", what);

  /* Make sure we have a current file.  */
  if (cur_file_ptr == (efdr_t *) NULL)
    {
      add_file ((const char *) NULL, 0);
      save_file_ptr = cur_file_ptr;
    }

  /* For stabs in ECOFF, the first symbol must be @stabs.  This is a
     signal to gdb.  */
  if (stabs_seen == 0)
    mark_stabs (0);

  /* Line number stabs are handled differently, since they have two
     values, the line number and the address of the label.  We use the
     index field (aka desc) to hold the line number, and the value
     field to hold the address.  The symbol type is st_Label, which
     should be different from the other stabs, so that gdb can
     recognize it.  */
  if (type == N_SLINE)
    {
      SYMR dummy_symr;
      char *name;
      char name_end;

#ifndef NO_LISTING
      if (listing)
    listing_source_line ((unsigned int) desc);
#endif

      dummy_symr.index = desc;
      if (dummy_symr.index != desc)
    {
      as_warn ("Line number (%d) for .stab%c directive cannot fit in index field (20 bits)",
           desc, what);
      return;
    }

      name = input_line_pointer;
      name_end = get_symbol_end ();

      sym = symbol_find_or_make (name);
      *input_line_pointer = name_end;

      value = 0;
      st = st_Label;
      sc = sc_Text;
      indx = desc;
    }
  else
    {
#ifndef NO_LISTING
      if (listing && (type == N_SO || type == N_SOL))
    listing_source_file (string);
#endif

      if (isdigit (*input_line_pointer)
      || *input_line_pointer == '-'
      || *input_line_pointer == '+')
    {
      st = st_Nil;
      sc = sc_Nil;
      sym = (symbolS *) NULL;
      value = get_absolute_expression ();
    }
      else if (! is_name_beginner ((unsigned char) *input_line_pointer))
    {
      as_warn ("Illegal .stab%c directive, bad character", what);
      return;
    }
      else
    {
      char *name;
      char name_end;

      name = input_line_pointer;
      name_end = get_symbol_end ();

      sym = symbol_find_or_make (name);

      sc = sc_Nil;
      st = st_Nil;
      value = 0;

      *input_line_pointer = name_end;
      if (name_end == '+' || name_end == '-')
        {
          ++input_line_pointer;
          value = get_absolute_expression ();
          if (name_end == '-')
        value = - value;
        }
    }

      indx = ECOFF_MARK_STAB (type);
    }

  /* Don't store the stabs symbol we are creating as the type of the
     ECOFF symbol.  We want to compute the type of the ECOFF symbol
     independently.  */
  if (sym != (symbolS *) NULL)
    hold = sym->ecoff_symbol;

  (void) add_ecoff_symbol (string, st, sc, sym, value, indx);

  if (sym != (symbolS *) NULL)
    sym->ecoff_symbol = hold;

  /* Restore normal file type.  */
  cur_file_ptr = save_file_ptr;
}

/* Frob an ECOFF symbol.  Small common symbols go into a special
   .scommon section rather than bfd_com_section.  */

void
ecoff_frob_symbol (sym)
     symbolS *sym;
{
  if (S_IS_COMMON (sym)
       && S_GET_VALUE (sym) > 0
       && S_GET_VALUE (sym) <= bfd_get_gp_size (stdoutput))
    {
      static asection scom_section;
      static asymbol scom_symbol;

      /* We must construct a fake section similar to bfd_com_section
     but with the name .scommon.  */
      if (scom_section.name == NULL)
    {
      scom_section = bfd_com_section;
      scom_section.name = ".scommon";
      scom_section.output_section = &scom_section;
      scom_section.symbol = &scom_symbol;
      scom_section.symbol_ptr_ptr = &scom_section.symbol;
      scom_symbol = *bfd_com_section.symbol;
      scom_symbol.name = ".scommon";
      scom_symbol.section = &scom_section;
    }
      S_SET_SEGMENT (sym, &scom_section);
    }
}

/* Add bytes to the symbolic information buffer.  */

static char *
ecoff_add_bytes (buf, bufend, bufptr, need)
     char **buf;
     char **bufend;
     char *bufptr;
     unsigned long need;
{
  unsigned long at;
  unsigned long want;

  at = bufptr - *buf;
  need -= *bufend - bufptr;
  if (need < PAGE_SIZE)
    need = PAGE_SIZE;
  want = (*bufend - *buf) + need;
  *buf = xrealloc (*buf, want);
  *bufend = *buf + want;
  return *buf + at;
}

/* Adjust the symbolic information buffer to the alignment required
   for the ECOFF target debugging information.  */

static unsigned long
ecoff_padding_adjust (backend, buf, bufend, offset, bufptrptr)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
     char **bufptrptr;
{
  bfd_size_type align;

  align = backend->debug_align;
  if ((offset & (align - 1)) != 0)
    {
      unsigned long add;

      add = align - (offset & (align - 1));
      if (*bufend - (*buf + offset) < add)
    (void) ecoff_add_bytes (buf, bufend, *buf + offset, add);
      memset (*buf + offset, 0, add);
      offset += add;
      if (bufptrptr != (char **) NULL)
    *bufptrptr = *buf + offset;
    }

  return offset;
}

/* Build the line number information.  */

static unsigned long
ecoff_build_lineno (backend, buf, bufend, offset, linecntptr)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
     long *linecntptr;
{
  char *bufptr;
  register lineno_list_t *l;
  lineno_list_t *last;
  efdr_t *file;
  proc_t *proc;
  unsigned long c;
  long iline;
  long totcount;
  lineno_list_t first;

  if (linecntptr != (long *) NULL)
    *linecntptr = 0;

  bufptr = *buf + offset;

  file = (efdr_t *) NULL;
  proc = (proc_t *) NULL;
  last = (lineno_list_t *) NULL;
  c = offset;
  iline = 0;
  totcount = 0;

  /* For some reason the address of the first procedure is ignored
     when reading line numbers.  This doesn't matter if the address of
     the first procedure is 0, but when gcc is generating MIPS
     embedded PIC code, it will put strings in the .text section
     before the first procedure.  We cope by inserting a dummy line if
     the address of the first procedure is not 0.  Hopefully this
     won't screw things up too badly.  */
  if (first_proc_ptr != (proc_t *) NULL
      && first_lineno != (lineno_list_t *) NULL
      && ((S_GET_VALUE (first_proc_ptr->sym->as_sym)
       + bfd_get_section_vma (stdoutput,
                  S_GET_SEGMENT (first_proc_ptr->sym->as_sym)))
      != 0))
    {
      first.file = first_lineno->file;
      first.proc = first_lineno->proc;
      first.frag = &zero_address_frag;
      first.paddr = 0;
      first.lineno = 0;

      first.next = first_lineno;
      first_lineno = &first;
    }

  for (l = first_lineno; l != (lineno_list_t *) NULL; l = l->next)
    {
      long count;
      long delta;

      /* Get the offset to the memory address of the next line number
     (in words).  Do this first, so that we can skip ahead to the
     next useful line number entry.  */
      if (l->next == (lineno_list_t *) NULL)
    {
      /* We want a count of zero, but it will be decremented
         before it is used.  */
      count = 1;
    }
      else
    {
      count = ((l->next->frag->fr_address + l->next->paddr
            - (l->frag->fr_address + l->paddr))
           >> 2);
      if (count <= 0)
        {
          /* Don't change last, so we still get the right delta.  */
          continue;
        }
    }

      if (l->file != file || l->proc != proc)
    {
      if (l->proc != proc && proc != (proc_t *) NULL)
        proc->pdr.lnHigh = last->lineno;
      if (l->file != file && file != (efdr_t *) NULL)
        {
          file->fdr.cbLine = c - file->fdr.cbLineOffset;
          /* The cline field is ill-documented.  This is a guess
         at the right value.  */
          file->fdr.cline = totcount + count;
          if (linecntptr != (long *) NULL)
        *linecntptr += totcount + count;
          totcount = 0;
        }

      if (l->file != file)
        {
          file = l->file;
          file->fdr.ilineBase = iline;
          file->fdr.cbLineOffset = c;
        }
      if (l->proc != proc)
        {
          proc = l->proc;
          if (proc != (proc_t *) NULL)
        {
          proc->pdr.lnLow = l->lineno;
          proc->pdr.cbLineOffset = c - file->fdr.cbLineOffset;
          /* The iline field is ill-documented.  This is a
             guess at the right value.  */
          proc->pdr.iline = totcount;
        }
        }

      last = (lineno_list_t *) NULL;
    }

      totcount += count;

      /* Get the offset to this line number.  */
      if (last == (lineno_list_t *) NULL)
    delta = 0;
      else
    delta = l->lineno - last->lineno;

      /* Put in the offset to this line number.  */
      while (delta != 0)
    {
      int setcount;

      /* 1 is added to each count read.  */
      --count;
      /* We can only adjust the word count by up to 15 words at a
         time.  */
      if (count <= 0x0f)
        {
          setcount = count;
          count = 0;
        }
      else
        {
          setcount = 0x0f;
          count -= 0x0f;
        }
      if (delta >= -7 && delta <= 7)
        {
          if (bufptr >= *bufend)
        bufptr = ecoff_add_bytes (buf, bufend, bufptr, (long) 1);
          *bufptr++ = setcount + (delta << 4);
          delta = 0;
          ++c;
        }
      else
        {
          int set;

          if (*bufend - bufptr < 3)
        bufptr = ecoff_add_bytes (buf, bufend, bufptr, (long) 3);
          *bufptr++ = setcount + (8 << 4);
          if (delta < -0x8000)
        {
          set = -0x8000;
          delta += 0x8000;
        }
          else if (delta > 0x7fff)
        {
          set = 0x7fff;
          delta -= 0x7fff;
        }
          else
        {
          set = delta;
          delta = 0;
        }
          *bufptr++ = set >> 8;
          *bufptr++ = set & 0xffff;
          c += 3;
        }
    }

      /* Finish adjusting the count.  */
      while (count > 0)
    {
      if (bufptr >= *bufend)
        bufptr = ecoff_add_bytes (buf, bufend, bufptr, (long) 1);
      /* 1 is added to each count read.  */
      --count;
      if (count > 0x0f)
        {
          *bufptr++ = 0x0f;
          count -= 0x0f;
        }
      else
        {
          *bufptr++ = count;
          count = 0;
        }
      ++c;
    }

      ++iline;
      last = l;
    }

  if (proc != (proc_t *) NULL)
    proc->pdr.lnHigh = last->lineno;
  if (file != (efdr_t *) NULL)
    {
      file->fdr.cbLine = c - file->fdr.cbLineOffset;
      file->fdr.cline = totcount;
    }

  if (linecntptr != (long *) NULL)
    *linecntptr += totcount;

  c = ecoff_padding_adjust (backend, buf, bufend, c, &bufptr);

  return c;
}

/* Build and swap out the symbols.  */

static unsigned long
ecoff_build_symbols (backend, buf, bufend, offset)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
{
  const bfd_size_type external_sym_size = backend->external_sym_size;
  void (* const swap_sym_out) PARAMS ((bfd *, const SYMR *, PTR))
    = backend->swap_sym_out;
  char *sym_out;
  long isym;
  vlinks_t *file_link;

  sym_out = *buf + offset;

  isym = 0;

  /* The symbols are stored by file.  */
  for (file_link = file_desc.first;
       file_link != (vlinks_t *) NULL;
       file_link = file_link->next)
    {
      int ifilesym;
      int fil_cnt;
      efdr_t *fil_ptr;
      efdr_t *fil_end;

      if (file_link->next == (vlinks_t *) NULL)
    fil_cnt = file_desc.objects_last_page;
      else
    fil_cnt = file_desc.objects_per_page;
      fil_ptr = file_link->datum->file;
      fil_end = fil_ptr + fil_cnt;
      for (; fil_ptr < fil_end; fil_ptr++)
    {
      vlinks_t *sym_link;

      fil_ptr->fdr.isymBase = isym;
      ifilesym = isym;
      for (sym_link = fil_ptr->symbols.first;
           sym_link != (vlinks_t *) NULL;
           sym_link = sym_link->next)
        {
          int sym_cnt;
          localsym_t *sym_ptr;
          localsym_t *sym_end;

          if (sym_link->next == (vlinks_t *) NULL)
        sym_cnt = fil_ptr->symbols.objects_last_page;
          else
        sym_cnt = fil_ptr->symbols.objects_per_page;
          sym_ptr = sym_link->datum->sym;
          sym_end = sym_ptr + sym_cnt;
          for (; sym_ptr < sym_end; sym_ptr++)
        {
          int local;
          symbolS *as_sym;
          forward_t *f;

          know (sym_ptr->file_ptr == fil_ptr);

          /* If there is no associated gas symbol, then this
             is a pure debugging symbol.  We have already
             added the name (if any) to fil_ptr->strings.
             Otherwise we must decide whether this is an
             external or a local symbol (actually, it may be
             both if the local provides additional debugging
             information for the external).  */
          local = 1;
          as_sym = sym_ptr->as_sym;
          if (as_sym != (symbolS *) NULL)
            {
              symint_t indx;

              /* The value of a block start symbol is the
             offset from the start of the procedure.  For
             other symbols we just use the gas value (but
             we must offset it by the vma of the section,
             just as BFD does, because BFD will not see
             this value).  */
              if (sym_ptr->ecoff_sym.asym.st == (int) st_Block
              && sym_ptr->ecoff_sym.asym.sc == (int) sc_Text)
            {
              symbolS *begin_sym;

              know (sym_ptr->proc_ptr != (proc_t *) NULL);
              begin_sym = sym_ptr->proc_ptr->sym->as_sym;
              if (S_GET_SEGMENT (as_sym)
                  != S_GET_SEGMENT (begin_sym))
                as_warn (".begin/.bend in different segments");
              sym_ptr->ecoff_sym.asym.value =
                S_GET_VALUE (as_sym) - S_GET_VALUE (begin_sym);
            }
              else
            sym_ptr->ecoff_sym.asym.value =
              (S_GET_VALUE (as_sym)
               + bfd_get_section_vma (stdoutput,
                          S_GET_SEGMENT (as_sym)));

              /* Set st_Proc to st_StaticProc for local
             functions.  */
              if (sym_ptr->ecoff_sym.asym.st == st_Proc
              && S_IS_DEFINED (as_sym)
              && ! S_IS_EXTERNAL (as_sym))
            sym_ptr->ecoff_sym.asym.st = st_StaticProc;

              /* Get the type and storage class based on where
             the symbol actually wound up.  Traditionally,
             N_LBRAC and N_RBRAC are *not* relocated. */
              indx = sym_ptr->ecoff_sym.asym.index;
              if (sym_ptr->ecoff_sym.asym.st == st_Nil
              && sym_ptr->ecoff_sym.asym.sc == sc_Nil
              && (! ECOFF_IS_STAB (&sym_ptr->ecoff_sym.asym)
                  || ((ECOFF_UNMARK_STAB (indx) != N_LBRAC)
                  && (ECOFF_UNMARK_STAB (indx) != N_RBRAC))))
            {
              segT seg;
              const char *segname;
              st_t st;
              sc_t sc;

              seg = S_GET_SEGMENT (as_sym);
              segname = segment_name (seg);

              if (! ECOFF_IS_STAB (&sym_ptr->ecoff_sym.asym)
                  && (S_IS_EXTERNAL (as_sym)
                  || ! S_IS_DEFINED (as_sym)))
                {
                  if ((as_sym->bsym->flags & BSF_FUNCTION) != 0)
                st = st_Proc;
                  else
                st = st_Global;
                }
              else if (seg == text_section)
                st = st_Label;
              else
                st = st_Static;

              if (! S_IS_DEFINED (as_sym))
                {
                  if (as_sym->ecoff_extern_size == 0
                  || (as_sym->ecoff_extern_size
                      > bfd_get_gp_size (stdoutput)))
                sc = sc_Undefined;
                  else
                {
                  sc = sc_SUndefined;
                  sym_ptr->ecoff_sym.asym.value =
                    as_sym->ecoff_extern_size;
                }
                }
              else if (S_IS_COMMON (as_sym))
                {
                  if (S_GET_VALUE (as_sym) > 0
                  && (S_GET_VALUE (as_sym)
                      <= bfd_get_gp_size (stdoutput)))
                sc = sc_SCommon;
                  else
                sc = sc_Common;
                }
              else if (seg == text_section)
                sc = sc_Text;
              else if (seg == data_section)
                sc = sc_Data;
              else if (strcmp (segname, ".rdata") == 0
                   || strcmp (segname, ".rodata") == 0)
                sc = sc_RData;
              else if (strcmp (segname, ".sdata") == 0)
                sc = sc_SData;
              else if (seg == bss_section)
                sc = sc_Bss;
              else if (strcmp (segname, ".sbss") == 0)
                sc = sc_SBss;
              else if (seg == &bfd_abs_section)
                sc = sc_Abs;
              else
                {
                  /* This must be a user named section.
                                 This is not possible in ECOFF, but it
                                 is in ELF.  */
                  sc = sc_Data;
                }

              sym_ptr->ecoff_sym.asym.st = (int) st;
              sym_ptr->ecoff_sym.asym.sc = (int) sc;
            }

              /* This is just an external symbol if it is
             outside a procedure and it has a type.
             FIXME: g++ will generate symbols which have
             different names in the debugging information
             than the actual symbol.  Should we handle
             them here?  */
              if ((S_IS_EXTERNAL (as_sym)
               || ! S_IS_DEFINED (as_sym))
              && sym_ptr->proc_ptr == (proc_t *) NULL
              && sym_ptr->ecoff_sym.asym.st != (int) st_Nil
              && ! ECOFF_IS_STAB (&sym_ptr->ecoff_sym.asym))
            local = 0;

              /* If an st_end symbol has an associated gas
             symbol, then it is a local label created for
             a .bend or .end directive.  Stabs line
             numbers will have \001 in the names.  */
              if (local
              && sym_ptr->ecoff_sym.asym.st != st_End
              && strchr (sym_ptr->name, '\001') == 0)
            sym_ptr->ecoff_sym.asym.iss =
              add_string (&fil_ptr->strings,
                      fil_ptr->str_hash,
                      sym_ptr->name,
                      (shash_t **) NULL);
            }

          /* We now know the index of this symbol; fill in
             locations that have been waiting for that
             information.  */
          if (sym_ptr->begin_ptr != (localsym_t *) NULL)
            {
              localsym_t *begin_ptr;
              st_t begin_type;

              know (local);
              begin_ptr = sym_ptr->begin_ptr;
              know (begin_ptr->sym_index != -1);
              sym_ptr->ecoff_sym.asym.index = begin_ptr->sym_index;
              if (sym_ptr->ecoff_sym.asym.sc != (int) sc_Info)
            sym_ptr->ecoff_sym.asym.iss =
              begin_ptr->ecoff_sym.asym.iss;

              begin_type = begin_ptr->ecoff_sym.asym.st;
              if (begin_type == st_File
              || begin_type == st_Block)
            {
              begin_ptr->ecoff_sym.asym.index =
                isym - ifilesym + 1;
              (*swap_sym_out) (stdoutput,
                       &begin_ptr->ecoff_sym.asym,
                       (*buf
                        + offset
                        + (begin_ptr->sym_index
                           * external_sym_size)));
            }
              else
            {
              know (begin_ptr->index_ptr != (aux_t *) NULL);
              begin_ptr->index_ptr->data.isym =
                isym - ifilesym + 1;
            }

              /* The value of the symbol marking the end of a
             procedure is the size of the procedure.  The
             value of the symbol marking the end of a
             block is the offset from the start of the
             procedure to the block.  */
              if (begin_type == st_Proc
              || begin_type == st_StaticProc)
            {
              know (as_sym != (symbolS *) NULL);
              know (begin_ptr->as_sym != (symbolS *) NULL);
              if (S_GET_SEGMENT (as_sym)
                  != S_GET_SEGMENT (begin_ptr->as_sym))
                as_warn (".begin/.bend in different segments");
              sym_ptr->ecoff_sym.asym.value =
                (S_GET_VALUE (as_sym)
                 - S_GET_VALUE (begin_ptr->as_sym));
            }
              else if (begin_type == st_Block
                   && sym_ptr->ecoff_sym.asym.sc != (int) sc_Info)
            {
              symbolS *begin_sym;

              know (as_sym != (symbolS *) NULL);
              know (sym_ptr->proc_ptr != (proc_t *) NULL);
              begin_sym = sym_ptr->proc_ptr->sym->as_sym;
              if (S_GET_SEGMENT (as_sym)
                  != S_GET_SEGMENT (begin_sym))
                as_warn (".begin/.bend in different segments");
              sym_ptr->ecoff_sym.asym.value =
                S_GET_VALUE (as_sym) - S_GET_VALUE (begin_sym);
            }
            }

          for (f = sym_ptr->forward_ref;
               f != (forward_t *) NULL;
               f = f->next)
            {
              know (local);
              f->ifd_ptr->data.isym = fil_ptr->file_index;
              f->index_ptr->data.rndx.index = isym - ifilesym;
            }

          if (local)
            {
              if (*bufend - sym_out < external_sym_size)
            sym_out = ecoff_add_bytes (buf, bufend,
                           sym_out,
                           external_sym_size);
              (*swap_sym_out) (stdoutput, &sym_ptr->ecoff_sym.asym,
                       sym_out);
              sym_out += external_sym_size;

              sym_ptr->sym_index = isym;

              if (sym_ptr->proc_ptr != (proc_t *) NULL
              && sym_ptr->proc_ptr->sym == sym_ptr)
            sym_ptr->proc_ptr->pdr.isym = isym - ifilesym;

              ++isym;
            }

          /* Record the local symbol index and file number in
             case this is an external symbol.  Note that this
             destroys the asym.index field.  */
          if (as_sym != (symbolS *) NULL
              && as_sym->ecoff_symbol == sym_ptr)
            {
              if ((sym_ptr->ecoff_sym.asym.st == st_Proc
               || sym_ptr->ecoff_sym.asym.st == st_StaticProc)
              && local)
            sym_ptr->ecoff_sym.asym.index = isym - ifilesym - 1;
              sym_ptr->ecoff_sym.ifd = fil_ptr->file_index;
            }
        }
        }
      fil_ptr->fdr.csym = isym - fil_ptr->fdr.isymBase;
    }
    }

  return offset + isym * external_sym_size;
}

/* Swap out the procedure information.  */

static unsigned long
ecoff_build_procs (backend, buf, bufend, offset)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
{
  const bfd_size_type external_pdr_size = backend->external_pdr_size;
  void (* const swap_pdr_out) PARAMS ((bfd *, const PDR *, PTR))
    = backend->swap_pdr_out;
  char *pdr_out;
  long iproc;
  vlinks_t *file_link;

  pdr_out = *buf + offset;

  iproc = 0;

  /* The procedures are stored by file.  */
  for (file_link = file_desc.first;
       file_link != (vlinks_t *) NULL;
       file_link = file_link->next)
    {
      int fil_cnt;
      efdr_t *fil_ptr;
      efdr_t *fil_end;

      if (file_link->next == (vlinks_t *) NULL)
    fil_cnt = file_desc.objects_last_page;
      else
    fil_cnt = file_desc.objects_per_page;
      fil_ptr = file_link->datum->file;
      fil_end = fil_ptr + fil_cnt;
      for (; fil_ptr < fil_end; fil_ptr++)
    {
      vlinks_t *proc_link;
      int first;

      fil_ptr->fdr.ipdFirst = iproc;
      first = 1;
      for (proc_link = fil_ptr->procs.first;
           proc_link != (vlinks_t *) NULL;
           proc_link = proc_link->next)
        {
          int prc_cnt;
          proc_t *proc_ptr;
          proc_t *proc_end;

          if (proc_link->next == (vlinks_t *) NULL)
        prc_cnt = fil_ptr->procs.objects_last_page;
          else
        prc_cnt = fil_ptr->procs.objects_per_page;
          proc_ptr = proc_link->datum->proc;
          proc_end = proc_ptr + prc_cnt;
          for (; proc_ptr < proc_end; proc_ptr++)
        {
          symbolS *adr_sym;
          unsigned long adr;

          adr_sym = proc_ptr->sym->as_sym;
          adr = (S_GET_VALUE (adr_sym)
             + bfd_get_section_vma (stdoutput,
                        S_GET_SEGMENT (adr_sym)));
          if (first)
            {
              /* This code used to force the adr of the very
                         first fdr to be 0.  However, the native tools
                         don't do that, and I can't remember why it
                         used to work that way, so I took it out.  */
              fil_ptr->fdr.adr = adr;
              first = 0;
            }
          proc_ptr->pdr.adr = adr - fil_ptr->fdr.adr;
          if (*bufend - pdr_out < external_pdr_size)
            pdr_out = ecoff_add_bytes (buf, bufend,
                           pdr_out,
                           external_pdr_size);
          (*swap_pdr_out) (stdoutput, &proc_ptr->pdr, pdr_out);
          pdr_out += external_pdr_size;
          ++iproc;
        }
        }
      fil_ptr->fdr.cpd = iproc - fil_ptr->fdr.ipdFirst;
    }
    }

  return offset + iproc * external_pdr_size;
}

/* Swap out the aux information.  */

static unsigned long
ecoff_build_aux (backend, buf, bufend, offset)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
{
  int bigendian;
  union aux_ext *aux_out;
  long iaux;
  vlinks_t *file_link;

  bigendian = stdoutput->xvec->header_byteorder_big_p;

  aux_out = (union aux_ext *) (*buf + offset);

  iaux = 0;

  /* The aux entries are stored by file.  */
  for (file_link = file_desc.first;
       file_link != (vlinks_t *) NULL;
       file_link = file_link->next)
    {
      int fil_cnt;
      efdr_t *fil_ptr;
      efdr_t *fil_end;

      if (file_link->next == (vlinks_t *) NULL)
    fil_cnt = file_desc.objects_last_page;
      else
    fil_cnt = file_desc.objects_per_page;
      fil_ptr = file_link->datum->file;
      fil_end = fil_ptr + fil_cnt;
      for (; fil_ptr < fil_end; fil_ptr++)
    {
      vlinks_t *aux_link;

      fil_ptr->fdr.fBigendian = bigendian;
      fil_ptr->fdr.iauxBase = iaux;
      for (aux_link = fil_ptr->aux_syms.first;
           aux_link != (vlinks_t *) NULL;
           aux_link = aux_link->next)
        {
          int aux_cnt;
          aux_t *aux_ptr;
          aux_t *aux_end;

          if (aux_link->next == (vlinks_t *) NULL)
        aux_cnt = fil_ptr->aux_syms.objects_last_page;
          else
        aux_cnt = fil_ptr->aux_syms.objects_per_page;
          aux_ptr = aux_link->datum->aux;
          aux_end = aux_ptr + aux_cnt;
          for (; aux_ptr < aux_end; aux_ptr++)
        {
          if (*bufend - (char *) aux_out < sizeof (union aux_ext))
            aux_out = ((union aux_ext *)
                   ecoff_add_bytes (buf, bufend,
                        (char *) aux_out,
                        sizeof (union aux_ext)));
          switch (aux_ptr->type)
            {
            case aux_tir:
              (*backend->swap_tir_out) (bigendian,
                        &aux_ptr->data.ti,
                        &aux_out->a_ti);
              break;
            case aux_rndx:
              (*backend->swap_rndx_out) (bigendian,
                         &aux_ptr->data.rndx,
                         &aux_out->a_rndx);
              break;
            case aux_dnLow:
              AUX_PUT_DNLOW (bigendian, aux_ptr->data.dnLow,
                     aux_out);
              break;
            case aux_dnHigh:
              AUX_PUT_DNHIGH (bigendian, aux_ptr->data.dnHigh,
                      aux_out);
              break;
            case aux_isym:
              AUX_PUT_ISYM (bigendian, aux_ptr->data.isym,
                    aux_out);
              break;
            case aux_iss:
              AUX_PUT_ISS (bigendian, aux_ptr->data.iss,
                   aux_out);
              break;
            case aux_width:
              AUX_PUT_WIDTH (bigendian, aux_ptr->data.width,
                     aux_out);
              break;
            case aux_count:
              AUX_PUT_COUNT (bigendian, aux_ptr->data.count,
                     aux_out);
              break;
            }

          ++aux_out;
          ++iaux;
        }
        }
      fil_ptr->fdr.caux = iaux - fil_ptr->fdr.iauxBase;
    }
    }

  return ecoff_padding_adjust (backend, buf, bufend,
                   offset + iaux * sizeof (union aux_ext),
                   (char **) NULL);
}

/* Copy out the strings from a varray_t.  This returns the number of
   bytes copied, rather than the new offset.  */

static unsigned long
ecoff_build_strings (buf, bufend, offset, vp)
     char **buf;
     char **bufend;
     unsigned long offset;
     varray_t *vp;
{
  unsigned long istr;
  char *str_out;
  vlinks_t *str_link;

  str_out = *buf + offset;

  istr = 0;

  for (str_link = vp->first;
       str_link != (vlinks_t *) NULL;
       str_link = str_link->next)
    {
      unsigned long str_cnt;

      if (str_link->next == (vlinks_t *) NULL)
    str_cnt = vp->objects_last_page;
      else
    str_cnt = vp->objects_per_page;

      if (*bufend - str_out < str_cnt)
    str_out = ecoff_add_bytes (buf, bufend, str_out, str_cnt);

      memcpy (str_out, str_link->datum->byte, str_cnt);
      str_out += str_cnt;
      istr += str_cnt;
    }

  return istr;
}

/* Dump out the local strings.  */

static unsigned long
ecoff_build_ss (backend, buf, bufend, offset)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
{
  long iss;
  vlinks_t *file_link;

  iss = 0;

  for (file_link = file_desc.first;
       file_link != (vlinks_t *) NULL;
       file_link = file_link->next)
    {
      int fil_cnt;
      efdr_t *fil_ptr;
      efdr_t *fil_end;

      if (file_link->next == (vlinks_t *) NULL)
    fil_cnt = file_desc.objects_last_page;
      else
    fil_cnt = file_desc.objects_per_page;
      fil_ptr = file_link->datum->file;
      fil_end = fil_ptr + fil_cnt;
      for (; fil_ptr < fil_end; fil_ptr++)
    {
      long ss_cnt;

      fil_ptr->fdr.issBase = iss;
      ss_cnt = ecoff_build_strings (buf, bufend, offset + iss,
                    &fil_ptr->strings);
      fil_ptr->fdr.cbSs = ss_cnt;
      iss += ss_cnt;
    }
    }

  return ecoff_padding_adjust (backend, buf, bufend, offset + iss,
                   (char **) NULL);
}

/* Swap out the file descriptors.  */

static unsigned long
ecoff_build_fdr (backend, buf, bufend, offset)
     const struct ecoff_debug_swap *backend;
     char **buf;
     char **bufend;
     unsigned long offset;
{
  const bfd_size_type external_fdr_size = backend->external_fdr_size;
  void (* const swap_fdr_out) PARAMS ((bfd *, const FDR *, PTR))
    = backend->swap_fdr_out;
  long ifile;
  char *fdr_out;
  vlinks_t *file_link;

  ifile = 0;

  fdr_out = *buf + offset;

  for (file_link = file_desc.first;
       file_link != (vlinks_t *) NULL;
       file_link = file_link->next)
    {
      int fil_cnt;
      efdr_t *fil_ptr;
      efdr_t *fil_end;

      if (file_link->next == (vlinks_t *) NULL)
    fil_cnt = file_desc.objects_last_page;
      else
    fil_cnt = file_desc.objects_per_page;
      fil_ptr = file_link->datum->file;
      fil_end = fil_ptr + fil_cnt;
      for (; fil_ptr < fil_end; fil_ptr++)
    {
      if (*bufend - fdr_out < external_fdr_size)
        fdr_out = ecoff_add_bytes (buf, bufend, fdr_out,
                       external_fdr_size);
      (*swap_fdr_out) (stdoutput, &fil_ptr->fdr, fdr_out);
      fdr_out += external_fdr_size;
      ++ifile;
    }
    }

  return offset + ifile * external_fdr_size;
}

/* Set up the external symbols.  These are supposed to be handled by
   the backend.  This routine just gets the right information and
   calls a backend function to deal with it.  */

static void
ecoff_setup_ext ()
{
  register symbolS *sym;

  for (sym = symbol_rootP; sym != (symbolS *) NULL; sym = symbol_next (sym))
    {
      if (sym->ecoff_symbol == NULL)
    continue;

      /* If this is a local symbol, then force the fields to zero.  */
      if (! S_IS_EXTERNAL (sym)
      && S_IS_DEFINED (sym))
    {
      sym->ecoff_symbol->ecoff_sym.asym.value = 0;
      sym->ecoff_symbol->ecoff_sym.asym.st = (int) st_Nil;
      sym->ecoff_symbol->ecoff_sym.asym.sc = (int) sc_Nil;
      sym->ecoff_symbol->ecoff_sym.asym.index = indexNil;
    }

      obj_ecoff_set_ext (sym, &sym->ecoff_symbol->ecoff_sym);
    }
}

/* Build the ECOFF dbeugging information.  */

unsigned long
ecoff_build_debug (hdr, bufp, backend)
     HDRR *hdr;
     char **bufp;
     const struct ecoff_debug_swap *backend;
{
  const bfd_size_type external_pdr_size = backend->external_pdr_size;
  tag_t *ptag;
  tag_t *ptag_next;
  efdr_t *fil_ptr;
  int end_warning;
  efdr_t *hold_file_ptr;
  proc_t * hold_proc_ptr;
  symbolS *sym;
  char *buf;
  char *bufend;
  unsigned long offset;

  /* Make sure we have a file.  */
  if (first_file == (efdr_t *) NULL)
    add_file ((const char *) NULL, 0);

  /* Handle any top level tags.  */
  for (ptag = top_tag_head->first_tag;
       ptag != (tag_t *) NULL;
       ptag = ptag_next)
    {
      if (ptag->forward_ref != (forward_t *) NULL)
    add_unknown_tag (ptag);

      ptag_next = ptag->same_block;
      ptag->hash_ptr->tag_ptr = ptag->same_name;
      free_tag (ptag);
    }

  free_thead (top_tag_head);

  /* Look through the symbols.  Add debugging information for each
     symbol that has not already received it.  */
  hold_file_ptr = cur_file_ptr;
  hold_proc_ptr = cur_proc_ptr;
  cur_proc_ptr = (proc_t *) NULL;
  for (sym = symbol_rootP; sym != (symbolS *) NULL; sym = symbol_next (sym))
    {
      if (sym->ecoff_symbol != NULL
      || sym->ecoff_file == (efdr_t *) NULL
      || (sym->bsym->flags & BSF_SECTION_SYM) != 0)
    continue;

      cur_file_ptr = sym->ecoff_file;
      add_ecoff_symbol ((const char *) NULL, st_Nil, sc_Nil, sym,
            S_GET_VALUE (sym), indexNil);
    }
  cur_proc_ptr = hold_proc_ptr;
  cur_file_ptr = hold_file_ptr;

  /* Output an ending symbol for all the files.  We have to do this
     here for the last file, so we may as well do it for all of the
     files.  */
  end_warning = 0;
  for (fil_ptr = first_file;
       fil_ptr != (efdr_t *) NULL;
       fil_ptr = fil_ptr->next_file)
    {
      cur_file_ptr = fil_ptr;
      while (cur_file_ptr->cur_scope->prev != (scope_t *) NULL)
    {
      cur_file_ptr->cur_scope = cur_file_ptr->cur_scope->prev;
      if (! end_warning)
        {
          as_warn ("Missing .end or .bend at end of file");
          end_warning = 1;
        }
    }
      (void) add_ecoff_symbol ((const char *) NULL,
                   st_End, sc_Text,
                   (symbolS *) NULL,
                   (symint_t) 0,
                   (symint_t) 0);
    }

  /* Build the symbolic information.  */
  offset = 0;
  buf = xmalloc (PAGE_SIZE);
  bufend = buf + PAGE_SIZE;

  /* Build the line number information.  */
  hdr->cbLineOffset = offset;
  offset = ecoff_build_lineno (backend, &buf, &bufend, offset,
                   &hdr->ilineMax);
  hdr->cbLine = offset - hdr->cbLineOffset;

  /* We don't use dense numbers at all.  */
  hdr->idnMax = 0;
  hdr->cbDnOffset = 0;

  /* We can't build the PDR table until we have built the symbols,
     because a PDR contains a symbol index.  However, we set aside
     space at this point.  */
  hdr->ipdMax = proc_cnt;
  hdr->cbPdOffset = offset;
  if (bufend - (buf + offset) < proc_cnt * external_pdr_size)
    (void) ecoff_add_bytes (&buf, &bufend, buf + offset,
                proc_cnt * external_pdr_size);
  offset += proc_cnt * external_pdr_size;

  /* Build the local symbols.  */
  hdr->cbSymOffset = offset;
  offset = ecoff_build_symbols (backend, &buf, &bufend, offset);
  hdr->isymMax = (offset - hdr->cbSymOffset) / backend->external_sym_size;

  /* Building the symbols initializes the symbol index in the PDR's.
     Now we can swap out the PDR's.  */
  (void) ecoff_build_procs (backend, &buf, &bufend, hdr->cbPdOffset);

  /* We don't use optimization symbols.  */
  hdr->ioptMax = 0;
  hdr->cbOptOffset = 0;

  /* Swap out the auxiliary type information.  */
  hdr->cbAuxOffset = offset;
  offset = ecoff_build_aux (backend, &buf, &bufend, offset);
  hdr->iauxMax = (offset - hdr->cbAuxOffset) / sizeof (union aux_ext);

  /* Copy out the local strings.  */
  hdr->cbSsOffset = offset;
  offset = ecoff_build_ss (backend, &buf, &bufend, offset);
  hdr->issMax = offset - hdr->cbSsOffset;

  /* We don't use relative file descriptors.  */
  hdr->crfd = 0;
  hdr->cbRfdOffset = 0;

  /* Swap out the file descriptors.  */
  hdr->cbFdOffset = offset;
  offset = ecoff_build_fdr (backend, &buf, &bufend, offset);
  hdr->ifdMax = (offset - hdr->cbFdOffset) / backend->external_fdr_size;

  /* Set up the external symbols, which are handled by the BFD back
     end.  */
  hdr->issExtMax = 0;
  hdr->cbSsExtOffset = 0;
  hdr->iextMax = 0;
  hdr->cbExtOffset = 0;
  ecoff_setup_ext ();

  know ((offset & (backend->debug_align - 1)) == 0);

  /* FIXME: This value should be determined from the .verstamp directive,
     with reasonable defaults in config files.  */
#ifdef TC_ALPHA
  hdr->vstamp = 0x030b;
#else
  hdr->vstamp = 0x020b;
#endif

  *bufp = buf;
  return offset;
}

/* Allocate a cluster of pages.  */

#ifndef MALLOC_CHECK

static page_t *
allocate_cluster (npages)
     unsigned long npages;
{
  register page_t *value = (page_t *) xmalloc (npages * PAGE_USIZE);

#ifdef ECOFF_DEBUG
  if (debug > 3)
    fprintf (stderr, "\talloc\tnpages = %d, value = 0x%.8x\n", npages, value);
#endif

  memset (value, 0, npages * PAGE_USIZE);

  return value;
}


static page_t *cluster_ptr = NULL;
static unsigned long pages_left = 0;

#endif /* MALLOC_CHECK */

/* Allocate one page (which is initialized to 0).  */

static page_t *
allocate_page ()
{
#ifndef MALLOC_CHECK

  if (pages_left == 0)
    {
      pages_left = MAX_CLUSTER_PAGES;
      cluster_ptr = allocate_cluster (pages_left);
    }

  pages_left--;
  return cluster_ptr++;

#else    /* MALLOC_CHECK */

  page_t *ptr;

  ptr = xmalloc (PAGE_USIZE);
  memset (ptr, 0, PAGE_USIZE);
  return ptr;

#endif    /* MALLOC_CHECK */
}

/* Allocate scoping information.  */

static scope_t *
allocate_scope ()
{
  register scope_t *ptr;
  static scope_t initial_scope;

#ifndef MALLOC_CHECK

  ptr = alloc_counts[(int)alloc_type_scope].free_list.f_scope;
  if (ptr != (scope_t *) NULL)
    alloc_counts[ (int)alloc_type_scope ].free_list.f_scope = ptr->free;
  else
    {
      register int unallocated    = alloc_counts[(int)alloc_type_scope].unallocated;
      register page_t *cur_page    = alloc_counts[(int)alloc_type_scope].cur_page;

      if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (scope_t);
      alloc_counts[(int)alloc_type_scope].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_scope].total_pages++;
    }

      ptr = &cur_page->scope[--unallocated];
      alloc_counts[(int)alloc_type_scope].unallocated = unallocated;
    }

#else

  ptr = (scope_t *) xmalloc (sizeof (scope_t));

#endif

  alloc_counts[(int)alloc_type_scope].total_alloc++;
  *ptr = initial_scope;
  return ptr;
}

/* Free scoping information.  */

static void
free_scope (ptr)
     scope_t *ptr;
{
  alloc_counts[(int)alloc_type_scope].total_free++;

#ifndef MALLOC_CHECK
  ptr->free = alloc_counts[(int)alloc_type_scope].free_list.f_scope;
  alloc_counts[(int)alloc_type_scope].free_list.f_scope = ptr;
#else
  free ((PTR) ptr);
#endif
}

/* Allocate links for pages in a virtual array.  */

static vlinks_t *
allocate_vlinks ()
{
  register vlinks_t *ptr;
  static vlinks_t initial_vlinks;

#ifndef MALLOC_CHECK

  register int unallocated = alloc_counts[(int)alloc_type_vlinks].unallocated;
  register page_t *cur_page = alloc_counts[(int)alloc_type_vlinks].cur_page;

  if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (vlinks_t);
      alloc_counts[(int)alloc_type_vlinks].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_vlinks].total_pages++;
    }

  ptr = &cur_page->vlinks[--unallocated];
  alloc_counts[(int)alloc_type_vlinks].unallocated = unallocated;

#else

  ptr = (vlinks_t *) xmalloc (sizeof (vlinks_t));

#endif

  alloc_counts[(int)alloc_type_vlinks].total_alloc++;
  *ptr = initial_vlinks;
  return ptr;
}

/* Allocate string hash buckets.  */

static shash_t *
allocate_shash ()
{
  register shash_t *ptr;
  static shash_t initial_shash;

#ifndef MALLOC_CHECK

  register int unallocated = alloc_counts[(int)alloc_type_shash].unallocated;
  register page_t *cur_page = alloc_counts[(int)alloc_type_shash].cur_page;

  if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (shash_t);
      alloc_counts[(int)alloc_type_shash].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_shash].total_pages++;
    }

  ptr = &cur_page->shash[--unallocated];
  alloc_counts[(int)alloc_type_shash].unallocated = unallocated;

#else

  ptr = (shash_t *) xmalloc (sizeof (shash_t));

#endif

  alloc_counts[(int)alloc_type_shash].total_alloc++;
  *ptr = initial_shash;
  return ptr;
}

/* Allocate type hash buckets.  */

static thash_t *
allocate_thash ()
{
  register thash_t *ptr;
  static thash_t initial_thash;

#ifndef MALLOC_CHECK

  register int unallocated = alloc_counts[(int)alloc_type_thash].unallocated;
  register page_t *cur_page = alloc_counts[(int)alloc_type_thash].cur_page;

  if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (thash_t);
      alloc_counts[(int)alloc_type_thash].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_thash].total_pages++;
    }

  ptr = &cur_page->thash[--unallocated];
  alloc_counts[(int)alloc_type_thash].unallocated = unallocated;

#else

  ptr = (thash_t *) xmalloc (sizeof (thash_t));

#endif

  alloc_counts[(int)alloc_type_thash].total_alloc++;
  *ptr = initial_thash;
  return ptr;
}

/* Allocate structure, union, or enum tag information.  */

static tag_t *
allocate_tag ()
{
  register tag_t *ptr;
  static tag_t initial_tag;

#ifndef MALLOC_CHECK

  ptr = alloc_counts[(int)alloc_type_tag].free_list.f_tag;
  if (ptr != (tag_t *) NULL)
    alloc_counts[(int)alloc_type_tag].free_list.f_tag = ptr->free;
  else
    {
      register int unallocated = alloc_counts[(int)alloc_type_tag].unallocated;
      register page_t *cur_page = alloc_counts[(int)alloc_type_tag].cur_page;

      if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (tag_t);
      alloc_counts[(int)alloc_type_tag].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_tag].total_pages++;
    }

      ptr = &cur_page->tag[--unallocated];
      alloc_counts[(int)alloc_type_tag].unallocated = unallocated;
    }

#else

  ptr = (tag_t *) xmalloc (sizeof (tag_t));

#endif

  alloc_counts[(int)alloc_type_tag].total_alloc++;
  *ptr = initial_tag;
  return ptr;
}

/* Free scoping information.  */

static void
free_tag (ptr)
     tag_t *ptr;
{
  alloc_counts[(int)alloc_type_tag].total_free++;

#ifndef MALLOC_CHECK
  ptr->free = alloc_counts[(int)alloc_type_tag].free_list.f_tag;
  alloc_counts[(int)alloc_type_tag].free_list.f_tag = ptr;
#else
  free ((PTR_T) ptr);
#endif
}

/* Allocate forward reference to a yet unknown tag.  */

static forward_t *
allocate_forward ()
{
  register forward_t *ptr;
  static forward_t initial_forward;

#ifndef MALLOC_CHECK

  register int unallocated = alloc_counts[(int)alloc_type_forward].unallocated;
  register page_t *cur_page = alloc_counts[(int)alloc_type_forward].cur_page;

  if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (forward_t);
      alloc_counts[(int)alloc_type_forward].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_forward].total_pages++;
    }

  ptr = &cur_page->forward[--unallocated];
  alloc_counts[(int)alloc_type_forward].unallocated = unallocated;

#else

  ptr = (forward_t *) xmalloc (sizeof (forward_t));

#endif

  alloc_counts[(int)alloc_type_forward].total_alloc++;
  *ptr = initial_forward;
  return ptr;
}

/* Allocate head of type hash list.  */

static thead_t *
allocate_thead ()
{
  register thead_t *ptr;
  static thead_t initial_thead;

#ifndef MALLOC_CHECK

  ptr = alloc_counts[(int)alloc_type_thead].free_list.f_thead;
  if (ptr != (thead_t *) NULL)
    alloc_counts[ (int)alloc_type_thead ].free_list.f_thead = ptr->free;
  else
    {
      register int unallocated = alloc_counts[(int)alloc_type_thead].unallocated;
      register page_t *cur_page = alloc_counts[(int)alloc_type_thead].cur_page;

      if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (thead_t);
      alloc_counts[(int)alloc_type_thead].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_thead].total_pages++;
    }

      ptr = &cur_page->thead[--unallocated];
      alloc_counts[(int)alloc_type_thead].unallocated = unallocated;
    }

#else

  ptr = (thead_t *) xmalloc (sizeof (thead_t));

#endif

  alloc_counts[(int)alloc_type_thead].total_alloc++;
  *ptr = initial_thead;
  return ptr;
}

/* Free scoping information.  */

static void
free_thead (ptr)
     thead_t *ptr;
{
  alloc_counts[(int)alloc_type_thead].total_free++;

#ifndef MALLOC_CHECK
  ptr->free = (thead_t *) alloc_counts[(int)alloc_type_thead].free_list.f_thead;
  alloc_counts[(int)alloc_type_thead].free_list.f_thead = ptr;
#else
  free ((PTR_T) ptr);
#endif
}

static lineno_list_t *
allocate_lineno_list ()
{
  register lineno_list_t *ptr;
  static lineno_list_t initial_lineno_list;

#ifndef MALLOC_CHECK

  register int unallocated = alloc_counts[(int)alloc_type_lineno].unallocated;
  register page_t *cur_page = alloc_counts[(int)alloc_type_lineno].cur_page;

  if (unallocated == 0)
    {
      unallocated = PAGE_SIZE / sizeof (lineno_list_t);
      alloc_counts[(int)alloc_type_lineno].cur_page = cur_page = allocate_page ();
      alloc_counts[(int)alloc_type_lineno].total_pages++;
    }

  ptr = &cur_page->lineno[--unallocated];
  alloc_counts[(int)alloc_type_lineno].unallocated = unallocated;

#else

  ptr = (lineno_list_t *) xmalloc (sizeof (lineno_list_t));

#endif

  alloc_counts[(int)alloc_type_lineno].total_alloc++;
  *ptr = initial_lineno_list;
  return ptr;
}

void
ecoff_set_gp_prolog_size (sz)
     int sz;
{
  if (cur_proc_ptr == 0)
    abort ();

  cur_proc_ptr->pdr.gp_prologue = sz;
  if (cur_proc_ptr->pdr.gp_prologue != sz)
    {
      as_warn ("GP prologue size exceeds field size, using 0 instead");
      cur_proc_ptr->pdr.gp_prologue = 0;
    }

  cur_proc_ptr->pdr.gp_used = 1;
}

static void
generate_ecoff_stab (what, string, type, other, desc)
     int what;
     const char *string;
     int type;
     int other;
     int desc;
{
  efdr_t *save_file_ptr = cur_file_ptr;
  symbolS *sym;
  symint_t value;
  st_t st;
  sc_t sc;
  symint_t indx;
  localsym_t *hold = NULL;

  /* We don't handle .stabd.  */
  if (what != 's' && what != 'n')
    {
      as_bad (".stab%c is not supported", what);
      return;
    }

  /* We ignore the other field.  */
  if (other != 0)
    as_warn (".stab%c: ignoring non-zero other field", what);

  /* Make sure we have a current file.  */
  if (cur_file_ptr == (efdr_t *) NULL)
    {
      add_file ((const char *) NULL, 0);
      save_file_ptr = cur_file_ptr;
    }

  /* For stabs in ECOFF, the first symbol must be @stabs.  This is a
     signal to gdb.  */
  if (stabs_seen == 0)
    mark_stabs (0);

  /* Line number stabs are handled differently, since they have two
     values, the line number and the address of the label.  We use the
     index field (aka desc) to hold the line number, and the value
     field to hold the address.  The symbol type is st_Label, which
     should be different from the other stabs, so that gdb can
     recognize it.  */
  if (type == N_SLINE)
    {
      SYMR dummy_symr;

#ifndef NO_LISTING
      if (listing)
    listing_source_line ((unsigned int) desc);
#endif

      dummy_symr.index = desc;
      if (dummy_symr.index != desc)
    {
      as_warn ("Line number (%d) for .stab%c directive cannot fit in index field (20 bits)",
           desc, what);
      return;
    }

      sym = symbol_find_or_make ((char *)string);
      value = 0;
      st = st_Label;
      sc = sc_Text;
      indx = desc;
    }
  else
    {
#ifndef NO_LISTING
      if (listing && (type == N_SO || type == N_SOL))
    listing_source_file (string);
#endif

      sym = symbol_find_or_make ((char *)string);
      sc = sc_Nil;
      st = st_Nil;
      value = 0;
      indx = ECOFF_MARK_STAB (type);
    }

  /* Don't store the stabs symbol we are creating as the type of the
     ECOFF symbol.  We want to compute the type of the ECOFF symbol
     independently.  */
  if (sym != (symbolS *) NULL)
    hold = sym->ecoff_symbol;

  (void) add_ecoff_symbol (string, st, sc, sym, value, indx);

  if (sym != (symbolS *) NULL)
    sym->ecoff_symbol = hold;

  /* Restore normal file type.  */
  cur_file_ptr = save_file_ptr;
}

int
ecoff_no_current_file ()
{
  return cur_file_ptr == (efdr_t *) NULL;
}

void
ecoff_generate_asm_lineno (filename, lineno)
    char *filename;
    int lineno;
{
  lineno_list_t *list;

  /* this potential can cause problem, when we start to see stab half the
     way thru the file */
/*
  if (stabs_seen)
    ecoff_generate_asm_line_stab(filename, lineno);
*/

  if (current_stabs_filename == (char *)NULL || strcmp (current_stabs_filename, filename))
    {
      add_file (filename, 0);
      generate_asm_lineno = 1;
    }

  list = allocate_lineno_list ();

  list->next = (lineno_list_t *) NULL;
  list->file = cur_file_ptr;
  list->proc = cur_proc_ptr;
  list->frag = frag_now;
  list->paddr = frag_now_fix ();
  list->lineno = lineno;

  /* A .loc directive will sometimes appear before a .ent directive,
     which means that cur_proc_ptr will be NULL here.  Arrange to
     patch this up.  */
  if (cur_proc_ptr == (proc_t *) NULL)
    {
      lineno_list_t **pl;

      pl = &noproc_lineno;
      while (*pl != (lineno_list_t *) NULL)
        pl = &(*pl)->next;
      *pl = list;
    }
  else
    {
      *last_lineno_ptr = list;
      last_lineno_ptr = &list->next;
    }
}

static int line_label_cnt = 0;
void
ecoff_generate_asm_line_stab (filename, lineno)
    char *filename;
    int lineno;
{
  char *ll;

  if (strcmp (current_stabs_filename, filename))
    {
      add_file (filename, 0);
      generate_asm_lineno = 1;
    }

  line_label_cnt++;
  /* generate local label $LMnn */
  ll = xmalloc(10);
  sprintf(ll, "$LM%d", line_label_cnt);
  colon (ll);

  /* generate stab for the line */
  generate_ecoff_stab ('n', ll, N_SLINE, 0, lineno);

}

#endif /* ECOFF_DEBUGGING */