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Education Sampler 1992 [NeXTSTEP]
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cc-61.0.1
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sdbout.c
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1991-05-05
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/* Output sdb-format symbol table information from GNU compiler.
Copyright (C) 1988-1990 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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 1, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#ifdef SDB_DEBUGGING_INFO
#include "tree.h"
#include "rtl.h"
#include <stdio.h>
#include "regs.h"
#ifdef USG
#include <syms.h>
#else
#include "syms.h"
#endif
/* Use T_INT if we don't have T_VOID. */
#if !defined(T_VOID) && !defined(__GNU_SYMS__)
#define T_VOID T_INT
#endif
/* #include <storclass.h> used to be this instead of syms.h. */
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#define MAX(x, y) ((x) > (y) ? (x) : (y))
/* 1 if PARM is passed to this function in memory. */
#define PARM_PASSED_IN_MEMORY(PARM) \
(GET_CODE (DECL_INCOMING_RTL (PARM)) == MEM)
/* A C expression for the integer offset value of an automatic variable
(C_AUTO) having address X (an RTX). */
#ifndef DEBUGGER_AUTO_OFFSET
#define DEBUGGER_AUTO_OFFSET(X) \
(GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0)
#endif
/* A C expression for the integer offset value of an argument (C_ARG)
having address X (an RTX). The nominal offset is OFFSET. */
#ifndef DEBUGGER_ARG_OFFSET
#define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET)
#endif
/* Line number of beginning of current function, minus one.
Negative means not in a function or not using sdb. */
int sdb_begin_function_line = -1;
/* Counter to generate unique "names" for nameless struct members. */
static int unnamed_struct_number = 0;
extern FILE *asm_out_file;
extern tree current_function_decl;
void sdbout_init ();
void sdbout_symbol ();
void sdbout_tags();
void sdbout_types();
static void sdbout_syms ();
static void sdbout_one_type ();
static void sdbout_queue_anonymous_type ();
static void sdbout_dequeue_anonymous_type ();
static int plain_type_1 ();
/* Define the default sizes for various types. */
#ifndef CHAR_TYPE_SIZE
#define CHAR_TYPE_SIZE BITS_PER_UNIT
#endif
#ifndef SHORT_TYPE_SIZE
#define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
#endif
#ifndef INT_TYPE_SIZE
#define INT_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef LONG_TYPE_SIZE
#define LONG_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef LONG_LONG_TYPE_SIZE
#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
#endif
#ifndef FLOAT_TYPE_SIZE
#define FLOAT_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef DOUBLE_TYPE_SIZE
#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
#endif
#ifndef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
#endif
/* Random macros describing parts of SDB data. */
/* Put something here if lines get too long */
#define CONTIN
/* Default value of delimiter is ";". */
#ifndef SDB_DELIM
#define SDB_DELIM ";"
#endif
/* Maximum number of dimensions the assembler will allow. */
#ifndef SDB_MAX_DIM
#define SDB_MAX_DIM 4
#endif
#ifndef PUT_SDB_SCL
#define PUT_SDB_SCL(a) fprintf(asm_out_file, "\t.scl\t%d%s", (a), SDB_DELIM)
#endif
#ifndef PUT_SDB_INT_VAL
#define PUT_SDB_INT_VAL(a) fprintf (asm_out_file, "\t.val\t%d%s", (a), SDB_DELIM)
#endif
#ifndef PUT_SDB_VAL
#define PUT_SDB_VAL(a) \
( fputs ("\t.val\t", asm_out_file), \
output_addr_const (asm_out_file, (a)), \
fprintf (asm_out_file, SDB_DELIM))
#endif
#ifndef PUT_SDB_DEF
#define PUT_SDB_DEF(a) \
do { fprintf (asm_out_file, "\t.def\t"); \
ASM_OUTPUT_LABELREF (asm_out_file, a); \
fprintf (asm_out_file, SDB_DELIM); } while (0)
#endif
#ifndef PUT_SDB_PLAIN_DEF
#define PUT_SDB_PLAIN_DEF(a) fprintf(asm_out_file,"\t.def\t.%s%s",a, SDB_DELIM)
#endif
#ifndef PUT_SDB_ENDEF
#define PUT_SDB_ENDEF fputs("\t.endef\n", asm_out_file)
#endif
#ifndef PUT_SDB_TYPE
#define PUT_SDB_TYPE(a) fprintf(asm_out_file, "\t.type\t0%o%s", a, SDB_DELIM)
#endif
#ifndef PUT_SDB_SIZE
#define PUT_SDB_SIZE(a) fprintf(asm_out_file, "\t.size\t%d%s", a, SDB_DELIM)
#endif
#ifndef PUT_SDB_START_DIM
#define PUT_SDB_START_DIM fprintf(asm_out_file, "\t.dim\t")
#endif
#ifndef PUT_SDB_NEXT_DIM
#define PUT_SDB_NEXT_DIM(a) fprintf(asm_out_file, "%d,", a)
#endif
#ifndef PUT_SDB_LAST_DIM
#define PUT_SDB_LAST_DIM(a) fprintf(asm_out_file, "%d%s", a, SDB_DELIM)
#endif
#ifndef PUT_SDB_TAG
#define PUT_SDB_TAG(a) \
do { fprintf (asm_out_file, "\t.tag\t"); \
ASM_OUTPUT_LABELREF (asm_out_file, a); \
fprintf (asm_out_file, SDB_DELIM); } while (0)
#endif
#ifndef PUT_SDB_BLOCK_START
#define PUT_SDB_BLOCK_START(LINE) \
fprintf (asm_out_file, \
"\t.def\t.bb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \
SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
#endif
#ifndef PUT_SDB_BLOCK_END
#define PUT_SDB_BLOCK_END(LINE) \
fprintf (asm_out_file, \
"\t.def\t.eb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \
SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
#endif
#ifndef PUT_SDB_FUNCTION_START
#define PUT_SDB_FUNCTION_START(LINE) \
fprintf (asm_out_file, \
"\t.def\t.bf%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \
SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
#endif
#ifndef PUT_SDB_FUNCTION_END
#define PUT_SDB_FUNCTION_END(LINE) \
fprintf (asm_out_file, \
"\t.def\t.ef%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \
SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM)
#endif
#ifndef PUT_SDB_EPILOGUE_END
#define PUT_SDB_EPILOGUE_END(NAME) \
do { fprintf (asm_out_file, "\t.def\t"); \
ASM_OUTPUT_LABELREF (asm_out_file, NAME); \
fprintf (asm_out_file, \
"%s\t.val\t.%s\t.scl\t-1%s\t.endef\n", \
SDB_DELIM, SDB_DELIM, SDB_DELIM); } while (0)
#endif
#ifndef SDB_GENERATE_FAKE
#define SDB_GENERATE_FAKE(BUFFER, NUMBER) \
sprintf ((BUFFER), ".%dfake", (NUMBER));
#endif
/* Return the sdb tag identifier string for TYPE
if TYPE has already been defined; otherwise return a null pointer. */
#define KNOWN_TYPE_TAG(type) (char *)(TYPE_SYMTAB_ADDRESS (type))
/* Set the sdb tag identifier string for TYPE to NAME. */
#define SET_KNOWN_TYPE_TAG(TYPE, NAME) \
(TYPE_SYMTAB_ADDRESS (TYPE) = (int)(NAME))
/* Return the name (a string) of the struct, union or enum tag
described by the TREE_LIST node LINK. This is 0 for an anonymous one. */
#define TAG_NAME(link) \
(((link) && TREE_PURPOSE ((link)) \
&& IDENTIFIER_POINTER (TREE_PURPOSE ((link)))) \
? IDENTIFIER_POINTER (TREE_PURPOSE ((link))) : (char *) 0)
/* Ensure we don't output a negative line number. */
#define MAKE_LINE_SAFE(line) \
if (line <= sdb_begin_function_line) line = sdb_begin_function_line + 1
/* Set up for SDB output at the start of compilation. */
void
sdbout_init ()
{
/* Output all the initial permanent types. */
sdbout_types (nreverse (get_permanent_types ()));
}
#if 0
/* return the tag identifier for type
*/
{
char *
tag_of_ru_type (type,link)
tree type,link;
{
if (TYPE_SYMTAB_ADDRESS (type))
return (char *)TYPE_SYMTAB_ADDRESS (type);
if (link && TREE_PURPOSE (link)
&& IDENTIFIER_POINTER (TREE_PURPOSE (link)))
TYPE_SYMTAB_ADDRESS (type)
= (int)IDENTIFIER_POINTER (TREE_PURPOSE (link));
else
return (char *) TYPE_SYMTAB_ADDRESS (type);
}
#endif
/* Return a unique string to name an anonymous type. */
static char *
gen_fake_label ()
{
char label[10];
char *labelstr;
SDB_GENERATE_FAKE (label, unnamed_struct_number);
unnamed_struct_number++;
labelstr = (char *) permalloc (strlen (label) + 1);
strcpy (labelstr, label);
return labelstr;
}
/* Return the number which describes TYPE for SDB.
For pointers, etc., this function is recursive.
Each record, union or enumeral type must already have had a
tag number output. */
/* The number is given by d6d5d4d3d2d1bbbb
where bbbb is 4 bit basic type, and di indicate one of notype,ptr,fn,array.
Thus, char *foo () has bbbb=T_CHAR
d1=D_FCN
d2=D_PTR
N_BTMASK= 017 1111 basic type field.
N_TSHIFT= 2 derived type shift
N_BTSHFT= 4 Basic type shift */
/* Produce the number that describes a pointer, function or array type.
PREV is the number describing the target, value or element type.
DT_type describes how to transform that type. */
#define PUSH_DERIVED_LEVEL(DT_type,PREV) \
((((PREV)&~N_BTMASK)<<N_TSHIFT)|(DT_type<<N_BTSHFT)|(PREV&N_BTMASK))
/* Number of elements used in sdb_dims. */
static int sdb_n_dims = 0;
/* Table of array dimensions of current type. */
static int sdb_dims[SDB_MAX_DIM];
/* Size of outermost array currently being processed. */
static int sdb_type_size = -1;
static int
plain_type (type)
tree type;
{
int val = plain_type_1 (type);
/* If we have already saved up some array dimensions, print them now. */
if (sdb_n_dims > 0)
{
int i;
PUT_SDB_START_DIM;
for (i = sdb_n_dims - 1; i > 0; i--)
PUT_SDB_NEXT_DIM (sdb_dims[i]);
PUT_SDB_LAST_DIM (sdb_dims[0]);
sdb_n_dims = 0;
sdb_type_size = int_size_in_bytes (type);
/* Don't kill sdb if type is not laid out or has variable size. */
if (sdb_type_size < 0)
sdb_type_size = 0;
}
/* If we have computed the size of an array containing this type,
print it now. */
if (sdb_type_size >= 0)
{
PUT_SDB_SIZE (sdb_type_size);
sdb_type_size = -1;
}
return val;
}
static void
sdbout_record_type_name (type)
tree type;
{
char *name = 0;
int no_name;
if (KNOWN_TYPE_TAG (type))
return;
if (TYPE_NAME (type) != 0)
{
tree t = 0;
/* Find the IDENTIFIER_NODE for the type name. */
if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
{
t = TYPE_NAME (type);
}
#if 0 /* Don't use typedef names. */
else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL)
{
t = DECL_NAME (TYPE_NAME (type));
}
#endif
/* Now get the name as a string, or invent one. */
if (t != 0)
name = IDENTIFIER_POINTER (t);
}
no_name = (name == 0 || *name == 0);
if (no_name)
name = gen_fake_label ();
SET_KNOWN_TYPE_TAG (type, name);
#ifdef SDB_ALLOW_FORWARD_REFERENCES
if (no_name)
sdbout_queue_anonymous_type (type);
#endif
}
static int
plain_type_1 (type)
tree type;
{
if (type == 0)
type = void_type_node;
if (type == error_mark_node)
type = integer_type_node;
type = TYPE_MAIN_VARIANT (type);
switch (TREE_CODE (type))
{
case VOID_TYPE:
return T_VOID;
case INTEGER_TYPE:
{
int size = int_size_in_bytes (type) * BITS_PER_UNIT;
if (size == CHAR_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? T_UCHAR : T_CHAR);
if (size == SHORT_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? T_USHORT : T_SHORT);
if (size == INT_TYPE_SIZE)
return (TREE_UNSIGNED (type) ? T_UINT : T_INT);
return 0;
}
case REAL_TYPE:
{
int size = int_size_in_bytes (type) * BITS_PER_UNIT;
if (size == FLOAT_TYPE_SIZE)
return T_FLOAT;
if (size == DOUBLE_TYPE_SIZE)
return T_DOUBLE;
return 0;
}
case ARRAY_TYPE:
{
int m;
m = plain_type_1 (TREE_TYPE (type));
if (sdb_n_dims < SDB_MAX_DIM)
sdb_dims[sdb_n_dims++]
= (TYPE_DOMAIN (type)
? TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) + 1
: 0);
return PUSH_DERIVED_LEVEL (DT_ARY, m);
}
case RECORD_TYPE:
case UNION_TYPE:
case ENUMERAL_TYPE:
{
char *tag;
#ifdef SDB_ALLOW_FORWARD_REFERENCES
sdbout_record_type_name (type);
#endif
if ((TREE_ASM_WRITTEN (type) && KNOWN_TYPE_TAG (type) != 0)
#ifdef SDB_ALLOW_FORWARD_REFERENCES
|| TYPE_MODE (type) != VOIDmode
#endif
)
{
/* Output the referenced structure tag name
only if the .def has already been finished.
At least on 386, the Unix assembler
cannot handle forward references to tags. */
/* But the 88100, it requires them, sigh... */
tag = KNOWN_TYPE_TAG (type);
PUT_SDB_TAG (tag);
}
sdb_type_size = int_size_in_bytes (type);
if (sdb_type_size < 0)
sdb_type_size = 0;
return ((TREE_CODE (type) == RECORD_TYPE) ? T_STRUCT
: (TREE_CODE (type) == UNION_TYPE) ? T_UNION
: T_ENUM);
}
case POINTER_TYPE:
case REFERENCE_TYPE:
{
int m = plain_type_1 (TREE_TYPE (type));
return PUSH_DERIVED_LEVEL (DT_PTR, m);
}
case FUNCTION_TYPE:
case METHOD_TYPE:
{
int m = plain_type_1 (TREE_TYPE (type));
return PUSH_DERIVED_LEVEL (DT_FCN, m);
}
default:
return 0;
}
}
/* Output the symbols defined in block number DO_BLOCK.
Set NEXT_BLOCK_NUMBER to 0 before calling.
This function works by walking the tree structure of blocks,
counting blocks until it finds the desired block. */
static int do_block = 0;
static int next_block_number;
static void
sdbout_block (block)
register tree block;
{
while (block)
{
/* Ignore blocks never expanded or otherwise marked as real. */
if (TREE_USED (block))
{
/* When we reach the specified block, output its symbols. */
if (next_block_number == do_block)
{
sdbout_tags (BLOCK_TYPE_TAGS (block));
sdbout_syms (BLOCK_VARS (block));
}
/* If we are past the specified block, stop the scan. */
if (next_block_number > do_block)
return;
next_block_number++;
/* Scan the blocks within this block. */
sdbout_block (BLOCK_SUBBLOCKS (block));
}
block = BLOCK_CHAIN (block);
}
}
/* Call sdbout_symbol on each decl in the chain SYMS. */
static void
sdbout_syms (syms)
tree syms;
{
while (syms)
{
sdbout_symbol (syms, 1);
syms = TREE_CHAIN (syms);
}
}
/* Output SDB information for a symbol described by DECL.
LOCAL is nonzero if the symbol is not file-scope. */
void
sdbout_symbol (decl, local)
tree decl;
int local;
{
int letter = 0;
tree type = TREE_TYPE (decl);
rtx value;
int regno = -1;
char *name;
/* If global, first output all types and all
struct, enum and union tags that have been created
and not yet output. */
if (local == 0)
{
sdbout_tags (gettags ());
sdbout_types (nreverse (get_permanent_types ()));
}
sdbout_one_type (type);
switch (TREE_CODE (decl))
{
case CONST_DECL:
/* Enum values are defined by defining the enum type. */
return;
case FUNCTION_DECL:
if (TREE_EXTERNAL (decl))
return;
if (GET_CODE (DECL_RTL (decl)) != MEM
|| GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF)
return;
PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl)));
PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
PUT_SDB_SCL (TREE_PUBLIC (decl) ? C_EXT : C_STAT);
break;
case TYPE_DECL:
/* Output typedef name. */
PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl)));
PUT_SDB_SCL (C_TPDEF);
break;
case PARM_DECL:
/* Parm decls go in their own separate chains
and are output by sdbout_reg_parms and sdbout_parms. */
abort ();
case VAR_DECL:
/* Don't mention a variable that is external.
Let the file that defines it describe it. */
if (TREE_EXTERNAL (decl))
return;
/* If there was an error in the declaration, don't dump core
if there is no RTL associated with the variable doesn't
exist. */
if (DECL_RTL (decl) == 0)
return;
value = DECL_RTL (decl);
/* Don't mention a variable at all
if it was completely optimized into nothingness.
If DECL was from an inline function, then its rtl
is not identically the rtl that was used in this
particular compilation. */
if (GET_CODE (value) == REG)
{
regno = REGNO (DECL_RTL (decl));
if (regno >= FIRST_PSEUDO_REGISTER)
regno = reg_renumber[REGNO (DECL_RTL (decl))];
if (regno < 0)
return;
}
else if (GET_CODE (DECL_RTL (decl)) == SUBREG)
{
int offset = 0;
while (GET_CODE (value) == SUBREG)
{
offset += SUBREG_WORD (value);
value = SUBREG_REG (value);
}
if (GET_CODE (value) == REG)
{
regno = REGNO (value);
if (regno >= FIRST_PSEUDO_REGISTER)
regno = reg_renumber[REGNO (value)];
if (regno >= 0)
regno += offset;
}
}
/* Emit any structure, union, or enum type that has not been output.
This occurs for tag-less structs (et al) used to declare variables
within functions. */
if (TREE_CODE (type) == ENUMERAL_TYPE
|| TREE_CODE (type) == RECORD_TYPE
|| TREE_CODE (type) == UNION_TYPE)
{
if (TYPE_SIZE (type) != 0 /* not a forward reference */
&& KNOWN_TYPE_TAG (type) == 0) /* not yet declared */
sdbout_one_type (type);
}
/* Defer SDB information for top-level initialized variables! */
if (! local
&& GET_CODE (value) == MEM
&& DECL_INITIAL (decl))
return;
/* Record the name for, starting a symtab entry. */
name = IDENTIFIER_POINTER (DECL_NAME (decl));
if (GET_CODE (value) == MEM
&& GET_CODE (XEXP (value, 0)) == SYMBOL_REF)
{
PUT_SDB_DEF (name);
if (TREE_PUBLIC (decl))
{
PUT_SDB_VAL (XEXP (value, 0));
PUT_SDB_SCL (C_EXT);
}
else
{
PUT_SDB_VAL (XEXP (value, 0));
PUT_SDB_SCL (C_STAT);
}
}
else if (regno >= 0)
{
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (regno));
PUT_SDB_SCL (C_REG);
}
else if (GET_CODE (value) == MEM
&& (GET_CODE (XEXP (value, 0)) == MEM
|| (GET_CODE (XEXP (value, 0)) == REG
&& REGNO (XEXP (value, 0)) != FRAME_POINTER_REGNUM)))
/* If the value is indirect by memory or by a register
that isn't the frame pointer
then it means the object is variable-sized and address through
that register or stack slot. COFF has no way to represent this
so all we can do is output the variable as a pointer. */
{
PUT_SDB_DEF (name);
if (GET_CODE (XEXP (value, 0)) == REG)
{
PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (XEXP (value, 0))));
PUT_SDB_SCL (C_REG);
}
else
{
/* DECL_RTL looks like (MEM (MEM (PLUS (REG...)
(CONST_INT...)))).
We want the value of that CONST_INT. */
/* Encore compiler hates a newline in a macro arg, it seems. */
PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET
(XEXP (XEXP (value, 0), 0)));
PUT_SDB_SCL (C_AUTO);
}
type = build_pointer_type (TREE_TYPE (decl));
}
else if (GET_CODE (value) == MEM
&& GET_CODE (XEXP (value, 0)) == PLUS
&& GET_CODE (XEXP (XEXP (value, 0), 0)) == REG
&& GET_CODE (XEXP (XEXP (value, 0), 1)) == CONST_INT)
{
/* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))).
We want the value of that CONST_INT. */
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET (XEXP (value, 0)));
PUT_SDB_SCL (C_AUTO);
}
else
{
/* It is something we don't know how to represent for SDB. */
return;
}
break;
}
PUT_SDB_TYPE (plain_type (type));
PUT_SDB_ENDEF;
}
/* Output SDB information for a top-level initialized variable
that has been delayed. */
void
sdbout_toplevel_data (decl)
tree decl;
{
tree type = TREE_TYPE (decl);
if (! (TREE_CODE (decl) == VAR_DECL
&& GET_CODE (DECL_RTL (decl)) == MEM
&& DECL_INITIAL (decl)))
abort ();
PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl)));
PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0));
if (TREE_PUBLIC (decl))
{
PUT_SDB_SCL (C_EXT);
}
else
{
PUT_SDB_SCL (C_STAT);
}
PUT_SDB_TYPE (plain_type (type));
PUT_SDB_ENDEF;
}
#ifdef SDB_ALLOW_FORWARD_REFERENCES
/* Machinery to record and output anonymous types. */
static tree anonymous_types;
static void
sdbout_queue_anonymous_type (type)
tree type;
{
anonymous_types = saveable_tree_cons (NULL_TREE, type, anonymous_types);
}
static void
sdbout_dequeue_anonymous_types ()
{
register tree types, link;
while (anonymous_types)
{
types = nreverse (anonymous_types);
anonymous_types = NULL_TREE;
for (link = types; link; link = TREE_CHAIN (link))
{
register tree type = TREE_VALUE (link);
if (! TREE_ASM_WRITTEN (type))
sdbout_one_type (type);
}
}
}
#endif
/* Given a list of TREE_LIST nodes that point at types,
output those types for SDB.
We must check to include those that have been mentioned already with
only a cross-reference. */
void
sdbout_tags (tags)
tree tags;
{
register tree link;
register tree head;
/*
* In at least one instance, the tags are in reverse order. No doubt
* this is like the names (getdecls). I couldn't find the right place
* to do the nreverse, so the idea is to swich it back after we're done.
*
* The problem is deeper than this. The tags must be in order encountered
* with inner scopes first. Reversing doesn't cut it, but helps. Putting
* enum's first helps more.
*/
head = nreverse (tags);
for (link = head; link; link = TREE_CHAIN (link))
{
register tree type = TREE_VALUE (link);
if (TREE_PURPOSE (link) != 0
&& TYPE_SIZE (type) != 0
&& TREE_CODE (type) == ENUMERAL_TYPE)
sdbout_one_type (type);
}
for (link = head; link; link = TREE_CHAIN (link))
{
register tree type = TREE_VALUE (link);
if (TREE_PURPOSE (link) != 0
&& TYPE_SIZE (type) != 0
&& TREE_CODE (type) != ENUMERAL_TYPE)
sdbout_one_type (type);
}
nreverse (head);
#ifdef SDB_ALLOW_FORWARD_REFERENCES
sdbout_dequeue_anonymous_types ();
#endif
}
/* Given a chain of ..._TYPE nodes, all of which have names,
output definitions of those names, as typedefs. */
void
sdbout_types (types)
register tree types;
{
register tree link;
for (link = types; link; link = TREE_CHAIN (link))
sdbout_one_type (link);
#ifdef SDB_ALLOW_FORWARD_REFERENCES
sdbout_dequeue_anonymous_types ();
#endif
}
static void
sdbout_type (type)
tree type;
{
register tree tem;
if (type == error_mark_node)
type = integer_type_node;
PUT_SDB_TYPE (plain_type (type));
}
/* Output types of the fields of type TYPE, if they are structs.
Formerly did not chase through pointer types, since that could be circular.
They must come before TYPE, since forward refs are not allowed.
Now james@bigtex.cactus.org says to try them. */
static void
sdbout_field_types (type)
tree type;
{
tree tail;
for (tail = TYPE_FIELDS (type); tail; tail = TREE_CHAIN (tail))
if (TREE_CODE (TREE_TYPE (tail)) == POINTER_TYPE)
sdbout_one_type (TREE_TYPE (TREE_TYPE (tail)));
else
sdbout_one_type (TREE_TYPE (tail));
}
/* Use this to put out the top level defined record and union types
for later reference. If this is a struct with a name, then put that
name out. Other unnamed structs will have .xxfake labels generated so
that they may be referred to later.
The label will be stored in the KNOWN_TYPE_TAG slot of a type.
It may NOT be called recursively. */
static void
sdbout_one_type (type)
tree type;
{
text_section ();
switch (TREE_CODE (type))
{
case RECORD_TYPE:
case UNION_TYPE:
case ENUMERAL_TYPE:
type = TYPE_MAIN_VARIANT (type);
/* Don't output a type twice. */
if (TREE_ASM_WRITTEN (type))
/* James said test TREE_ASM_BEING_WRITTEN here. */
return;
/* Output nothing if type is not yet defined. */
if (TYPE_SIZE (type) == 0)
return;
TREE_ASM_WRITTEN (type) = 1;
#if 1
/* This is reputed to cause trouble with the following case,
but perhaps checking TYPE_SIZE above will fix it.
/* Here is a test case:
struct foo {
struct badstr *bbb;
} forwardref;
typedef struct intermediate {
int aaaa;
} intermediate_ref;
typedef struct badstr {
int ccccc;
} badtype; */
#if 0
TREE_ASM_BEING_WRITTEN (type) = 1;
#endif
/* This change, which ought to make better output,
used to make the COFF assembler unhappy.
Changes involving KNOWN_TYPE_TAG may fix the problem. */
/* Before really doing anything, output types we want to refer to. */
/* Note that in version 1 the following two lines
are not used if forward references are in use. */
if (TREE_CODE (type) != ENUMERAL_TYPE)
sdbout_field_types (type);
#if 0
TREE_ASM_WRITTEN (type) = 1;
#endif
#endif
/* Output a structure type. */
{
int size = int_size_in_bytes (type);
int member_scl;
tree tem;
/* Record the type tag, but not in its permanent place just yet. */
sdbout_record_type_name (type);
PUT_SDB_DEF (KNOWN_TYPE_TAG (type));
switch (TREE_CODE (type))
{
case UNION_TYPE:
PUT_SDB_SCL (C_UNTAG);
PUT_SDB_TYPE (T_UNION);
member_scl = C_MOU;
break;
case RECORD_TYPE:
PUT_SDB_SCL (C_STRTAG);
PUT_SDB_TYPE (T_STRUCT);
member_scl = C_MOS;
break;
case ENUMERAL_TYPE:
PUT_SDB_SCL (C_ENTAG);
PUT_SDB_TYPE (T_ENUM);
member_scl = C_MOE;
break;
}
PUT_SDB_SIZE (size);
PUT_SDB_ENDEF;
/* output the individual fields */
if (TREE_CODE (type) == ENUMERAL_TYPE)
for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
{
PUT_SDB_DEF (IDENTIFIER_POINTER (TREE_PURPOSE (tem)));
PUT_SDB_INT_VAL (TREE_INT_CST_LOW (TREE_VALUE (tem)));
PUT_SDB_SCL (C_MOE);
PUT_SDB_TYPE (T_MOE);
PUT_SDB_ENDEF;
}
else /* record or union type */
for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem))
/* Output the name, type, position (in bits), size (in bits)
of each field. */
/* Omit here the nameless fields that are used to skip bits.
Also omit fields with variable size or position.
Also omit non FIELD_DECL nodes that GNU C++ may put here. */
if (TREE_CODE (tem) == FIELD_DECL
&& DECL_NAME (tem) != 0
&& TREE_CODE (DECL_SIZE (tem)) == INTEGER_CST
&& TREE_CODE (DECL_FIELD_BITPOS (tem)) == INTEGER_CST)
{
CONTIN;
PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (tem)));
if (DECL_BIT_FIELD_TYPE (tem))
{
PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)));
PUT_SDB_SCL (C_FIELD);
sdbout_type (DECL_BIT_FIELD_TYPE (tem));
PUT_SDB_SIZE (TREE_INT_CST_LOW (DECL_SIZE (tem)));
}
else
{
PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem))
/ BITS_PER_UNIT);
PUT_SDB_SCL (member_scl);
sdbout_type (TREE_TYPE (tem));
}
PUT_SDB_ENDEF;
}
/* output end of a structure,union, or enumeral definition */
PUT_SDB_PLAIN_DEF ("eos");
PUT_SDB_INT_VAL (size);
PUT_SDB_SCL (C_EOS);
PUT_SDB_TAG (KNOWN_TYPE_TAG (type));
PUT_SDB_SIZE (size);
PUT_SDB_ENDEF;
break;
}
}
}
/* The following two functions output definitions of function parameters.
Each parameter gets a definition locating it in the parameter list.
Each parameter that is a register variable gets a second definition
locating it in the register.
Printing or argument lists in gdb uses the definitions that
locate in the parameter list. But reference to the variable in
expressions uses preferentially the definition as a register. */
/* Output definitions, referring to storage in the parmlist,
of all the parms in PARMS, which is a chain of PARM_DECL nodes. */
static void
sdbout_parms (parms)
tree parms;
{
for (; parms; parms = TREE_CHAIN (parms))
if (DECL_NAME (parms))
{
int current_sym_value = 0;
char *name = IDENTIFIER_POINTER (DECL_NAME (parms));
if (name == 0 || *name == 0)
name = gen_fake_label ();
if (PARM_PASSED_IN_MEMORY (parms))
{
rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0);
tree type;
/* ??? Here we assume that the parm address is indexed
off the frame pointer or arg pointer.
If that is not true, we produce meaningless results,
but do not crash. */
if (GET_CODE (addr) == PLUS
&& GET_CODE (XEXP (addr, 1)) == CONST_INT)
current_sym_value = INTVAL (XEXP (addr, 1));
else
current_sym_value = 0;
if (GET_CODE (DECL_RTL (parms)) == REG
&& REGNO (DECL_RTL (parms)) >= 0
&& REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
type = DECL_ARG_TYPE (parms);
else
{
int original_sym_value = current_sym_value;
/* This is the case where the parm is passed as an int or
double and it is converted to a char, short or float
and stored back in the parmlist. In this case, describe
the parm with the variable's declared type, and adjust
the address if the least significant bytes (which we are
using) are not the first ones. */
#if BYTES_BIG_ENDIAN
if (TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
current_sym_value +=
(GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
- GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
#endif
if (GET_CODE (DECL_RTL (parms)) == MEM
&& GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
&& (GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1))
== CONST_INT)
&& (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1))
== current_sym_value))
type = TREE_TYPE (parms);
else
{
current_sym_value = original_sym_value;
type = DECL_ARG_TYPE (parms);
}
}
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, addr));
PUT_SDB_SCL (C_ARG);
PUT_SDB_TYPE (plain_type (type));
PUT_SDB_ENDEF;
}
else if (GET_CODE (DECL_RTL (parms)) == REG
&& REGNO (DECL_RTL (parms)) >= 0
&& REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER)
{
/* Parm was passed in registers and lives in registers.
Output a "regparm" symbol for the register it lives in. */
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms))));
PUT_SDB_SCL (C_REGPARM);
PUT_SDB_TYPE (plain_type (TREE_TYPE (parms), 0));
PUT_SDB_ENDEF;
}
else if (GET_CODE (DECL_RTL (parms)) == MEM
&& XEXP (DECL_RTL (parms), 0) != const0_rtx)
{
/* Parm was passed in registers but lives on the stack. */
/* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))),
in which case we want the value of that CONST_INT, or
(MEM (REG ...)), in which case we use a value of zero. */
if (GET_CODE (XEXP (DECL_RTL (parms), 0)) == REG)
current_sym_value = 0;
else
current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1));
/* Again, this assumes the offset is based on the arg pointer. */
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value,
XEXP (DECL_RTL (parms), 0)));
PUT_SDB_SCL (C_ARG);
PUT_SDB_TYPE (plain_type (TREE_TYPE (parms), 0));
PUT_SDB_ENDEF;
}
}
}
/* Output definitions for the places where parms live during the function,
when different from where they were passed, when the parms were passed
in memory.
It is not useful to do this for parms passed in registers
that live during the function in different registers, because it is
impossible to look in the passed register for the passed value,
so we use the within-the-function register to begin with.
PARMS is a chain of PARM_DECL nodes. */
static void
sdbout_reg_parms (parms)
tree parms;
{
for (; parms; parms = TREE_CHAIN (parms))
if (DECL_NAME (parms))
{
char *name = IDENTIFIER_POINTER (DECL_NAME (parms));
/* Report parms that live in registers during the function
but were passed in memory. */
if (GET_CODE (DECL_RTL (parms)) == REG
&& REGNO (DECL_RTL (parms)) >= 0
&& REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER
&& PARM_PASSED_IN_MEMORY (parms))
{
if (name == 0 || *name == 0)
name = gen_fake_label ();
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms))));
PUT_SDB_SCL (C_REG);
PUT_SDB_TYPE (plain_type (TREE_TYPE (parms), 0));
PUT_SDB_ENDEF;
}
/* Report parms that live in memory but not where they were passed. */
else if (GET_CODE (DECL_RTL (parms)) == MEM
&& GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS
&& GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT
&& PARM_PASSED_IN_MEMORY (parms)
&& ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms)))
{
#if 0 /* ??? It is not clear yet what should replace this. */
int offset = DECL_OFFSET (parms) / BITS_PER_UNIT;
/* A parm declared char is really passed as an int,
so it occupies the least significant bytes.
On a big-endian machine those are not the low-numbered ones. */
#if BYTES_BIG_ENDIAN
if (offset != -1 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms))
offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms)))
- GET_MODE_SIZE (GET_MODE (DECL_RTL (parms))));
#endif
if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...}
#endif
{
if (name == 0 || *name == 0)
name = gen_fake_label ();
PUT_SDB_DEF (name);
PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET
(XEXP (DECL_RTL (parms), 0)));
PUT_SDB_SCL (C_AUTO);
PUT_SDB_TYPE (plain_type (TREE_TYPE (parms)));
PUT_SDB_ENDEF;
}
}
}
}
/* Describe the beginning of an internal block within a function.
Also output descriptions of variables defined in this block.
N is the number of the block, by order of beginning, counting from 1,
and not counting the outermost (function top-level) block.
The blocks match the BLOCKs in DECL_INITIAL (current_function_decl),
if the count starts at 0 for the outermost one. */
void
sdbout_begin_block (file, line, n)
FILE *file;
int line;
int n;
{
tree decl = current_function_decl;
MAKE_LINE_SAFE (line);
PUT_SDB_BLOCK_START (line - sdb_begin_function_line);
if (n == 1)
{
/* Include the outermost BLOCK's variables in block 1. */
next_block_number = 0;
do_block = 0;
sdbout_block (DECL_INITIAL (decl));
}
next_block_number = 0;
do_block = n;
sdbout_block (DECL_INITIAL (decl));
#ifdef SDB_ALLOW_FORWARD_REFERENCES
sdbout_dequeue_anonymous_types ();
#endif
}
/* Describe the end line-number of an internal block within a function. */
void
sdbout_end_block (file, line)
FILE *file;
int line;
{
MAKE_LINE_SAFE (line);
PUT_SDB_BLOCK_END (line - sdb_begin_function_line);
}
/* Output sdb info for the current function name.
Called from assemble_function. */
void
sdbout_mark_begin_function ()
{
sdbout_symbol (current_function_decl, 0);
}
/* Called at beginning of function body (after prologue).
Record the function's starting line number, so we can output
relative line numbers for the other lines.
Describe beginning of outermost block.
Also describe the parameter list. */
void
sdbout_begin_function (line)
int line;
{
sdb_begin_function_line = line - 1;
PUT_SDB_FUNCTION_START (line);
sdbout_parms (DECL_ARGUMENTS (current_function_decl));
sdbout_reg_parms (DECL_ARGUMENTS (current_function_decl));
}
/* Called at end of function (before epilogue).
Describe end of outermost block. */
void
sdbout_end_function (line)
int line;
{
#ifdef SDB_ALLOW_FORWARD_REFERENCES
sdbout_dequeue_anonymous_types ();
#endif
MAKE_LINE_SAFE (line);
PUT_SDB_FUNCTION_END (line - sdb_begin_function_line);
/* Indicate we are between functions, for line-number output. */
sdb_begin_function_line = -1;
}
/* Output sdb info for the absolute end of a function.
Called after the epilogue is output. */
void
sdbout_end_epilogue ()
{
char *name = IDENTIFIER_POINTER (DECL_NAME (current_function_decl));
PUT_SDB_EPILOGUE_END (name);
}
/* Output sdb info for the given label. Called only if LABEL_NAME (insn)
is present. */
void
sdbout_label (insn)
register rtx insn;
{
PUT_SDB_DEF (LABEL_NAME (insn));
PUT_SDB_VAL (insn);
PUT_SDB_SCL (C_LABEL);
PUT_SDB_TYPE (T_NULL);
PUT_SDB_ENDEF;
}
#endif /* SDB_DEBUGGING_INFO */