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C/C++ Source or Header | 1994-02-08 | 15.8 KB | 463 lines

/* I C R S S . H header file for icmake run time support system.. generic functions are declared here structure of the binary file: version e.g., "1.00", without ascii-z offset of the string constant-area (long) offset of the variable area (long) offset of the filenames area (long) (end of BIN_HEADER_) offset of first instr. to execute (long) code (first byte is first instruction) ascii-z string constant area variables filenames '\n' terminated strings If a logical expression is compiled, it is evaluated using true- and false-lists to determine its result as quickly as possible. Then, if the expression is not returned to an if- or while- condition, the true-list backpatches to the current code position, where a push_1_jmp_end instruction is written. Then the falselist is backpatched to the current code position and a push_0 opcode is written. If a logical is expresion is returned to an if- or while-condition, the code of the if/while statement is placed beyond the truelist (possibly followed by the code of the 'else' part of an if-stmnt). The runtime stack contains elements of type VAR_. When a element is popped, the type of the value and its descriptor are therefor available. push instructions must make sure that type and descriptors are pushed Opcodes: op_jmp int-displacement op_jmp_false int-displacement (implicit pop) op_jmp_true int-displacement (implicit pop) op_push_1_jmp_end jumps 1 byte (beyond push_0) op_push_0 op_push_imm imm-value op_push_strconst string-index op_push_var var # (var is an int or a list, info in var[#].type) op_push_reg push return register (set by function) op_pop_var var # (var is an int or a list, info in var[#].type) op_umin unary opcode, negating the stack[sp] value op_atoi string -> int (type casting) op_itoa int -> string op_atol string -> 1-element list binary opcodes pop two operands from the stack, perform operation and push result: arithmetic opcodes: op_mul op_div op_mod op_add op_sub bitwise: op_band op_bor op_bnot op_xor op_shl op_shr logical opcodes, resulting value is always immediate 1 or 0 op_eq == op_neq != op_sm < op_gr > op_smeq <= op_greq >= op_younger younger op_older older op_call funnr funnr is a byte (see enum FUNNR_) op_asp #args #args is a byte (asp: add stack pointer, clean stack) ( NOTE on function execute: see below ) op_exit terminate command list processing, return stack[sp].intval to operating system (auto generated as the last instruction) op_copy_var varnr stackinfo of formerly popped stackelement to var varnr op_inc increment int variable, varnr is INT16 argument op_dec decrement int variable, varnr is INT16 argument op_call INT16 call function at offset op_frame INT8 ... make function frame, for INT8 variables For each variable a byte follows, denoting the type of the local variable. The first byte refers to the first local variable following the position to where BP points (see the info about stackframes). op_ret break frame and return op_pop_reg pop into return register op_hlt not generated instruction, used for internal testing. Type casts ---------- --------------|---------------------------------- | cast result |---------------------------------- | (int) (string) (list) --------------|---------------------------------- cast operand: | --------------| int | ok itoa error | string| atoi ok atol | --------------|---------------------------------- Operand matrix: --------------- ------|---------------------------------- | int string list ------|---------------------------------- | int | all | | string| == != > | < <= >= | + += = | older | younger list | == != | + - | += -= = ------|---------------------------------- Stackframes ----------- Variable numbers less than 0x8000 refer to global variables. Local variables are numbered relative to the value 0xc000, indicating [BP]. Thus, the following addressing scheme is followed: -------------------------------------------------------------- Frame: Variable numbers: -------------------------------------------------------------- arg2 0xc003 arg1 0xc002 ra (0xc001, not used) old bp <-bp (0xc000, not used) loc1 0xbfff loc2 0xbffe -------------------------------------------------------------- The op_frame instruction needed for the previous example, assuming loc1 of type int, and loc2 of type string, is: op_frame 2, e_int, e_str (opcode and three INT8's) Functions printf, fprintf ------------------------- The variable number of arguments which are allowed for these functions are passed to the executor of icmake in the following manner: Starting with ICMAKE version 4.00 the mode flag is no longer interpreted. The modeflag is therefore ignored. A hidden argument, specifying the number of arguments, is pushed as a hidden parameter. So, the following statement results in the following code: printf("hello world\n") push string constant "hello world\n" // the string itself push 1 // the number of arguments call funnr #x // call printf add sp, 2 // clear two arguments Functions chdir, system, putenv ------------------------------- Starting with version 4.00, the mode flag is no longer needed. The functions now expect only one string argument. For reasons of compatibility with previous versions, a first integer argument is ignored if present. Functions exec, execute ----------------------- Starting with version 4.00, the mode flag no longer specifies delayed or immediate processing. The mode flag however still defines whether error checking should or should not occur. The argument handling is, apart from the required first mode flag, similar to that of the functions printf and fprintf. */ #include "../icm.h" #include <stdio.h> /* The compiler uses E_TYPE 0 to indicate the void type. */ typedef enum { /* rss + compiler: */ e_int = (1 << 0), /* int-type expression */ e_str = (1 << 1), /* string-type expression */ e_list = (1 << 2), /* list-type expression */ /* compiler only: */ e_bool = (1 << 3), /* bool-type expression */ e_const = (1 << 4), /* immediate value */ e_var = (1 << 5), /* variable */ e_reg = (1 << 6), /* register */ e_code = (1 << 7), /* code */ e_pre_inc_dec = (1 << 8), /* pre-inc or pre-dec */ e_post_inc_dec = (1 << 9), /* post-inc or post-dec */ } E_TYPE_; typedef enum /* names of rss-functions */ { f_arg_head, f_arg_tail, f_ascii_int, /* return int */ f_ascii_str, /* return str */ f_c_base, f_chdir, f_c_ext, f_cmd_head, f_cmd_tail, f_c_path, f_echo, f_element, f_exec, f_execute, /* only used by the compiler */ f_exists, f_fields, f_fgets, f_fprintf, f_g_base, f_getch, f_gets, f_g_ext, f_g_path, f_makelist, f_printf, f_putenv, f_sizeoflist, f_stat, f_str_el, f_strlwr, /* only used by the compiler */ f_strupr, /* only used by the compiler */ f_system, /* reserved rss function opcodes for subreleases */ f_strlen, /* NEW: only for the compiler */ f_substr, /* IDEM */ f_getpid, /* used by several programs */ f_hlt = f_system + 10, /* dummy marker for non-existing */ } FUNNR_; typedef enum { /* hexnr: */ op_jmp, /* 00 */ op_jmp_false, /* 01 */ op_jmp_true, /* 02 */ op_push_1_jmp_end, /* 03 */ op_push_0, /* 04 */ op_push_imm, /* 05 */ op_push_strconst, /* 06 */ op_push_var, /* 07 */ op_push_reg, /* 08 */ op_pop_var, /* 09 */ op_umin, /* 0a */ op_atoi, /* 0b */ op_itoa, /* 0c */ op_atol, /* 0d */ op_mul, /* 0e */ op_div, /* 0f */ op_mod, /* 10 */ op_add, /* 11 */ op_sub, /* 12 */ op_eq, /* 13 */ op_neq, /* 14 */ op_sm, /* 15 */ op_gr, /* 16 */ op_younger, /* 17 */ op_older, /* 18 */ op_smeq, /* 19 */ op_greq, /* 1a */ op_call_rss, /* 1b */ op_asp, /* 1c */ op_exit, /* 1d */ op_copy_var, /* 1e */ op_inc, /* 1f */ op_dec, /* 20 */ op_call, /* 21 */ op_frame, /* 22 */ op_ret, /* 23 */ op_pop_reg, /* 24 */ op_band, /* 25 */ op_bor, /* 26 */ op_bnot, /* 27 */ op_xor, /* 28 */ op_shl, /* 29 */ op_shr, /* 2a */ op_hlt = op_shr + 10/* .. */ } OPCODE_; typedef struct { char version[4]; INT32 offset[4]; } BIN_HEADER_; /* see header structure at BOF */ typedef struct { UNS16 size; char **element; /* used as (char *) by icmcomp */ } LIST_; typedef union { char *str; /* address of allocated string */ LIST_ list; /* list info of a list */ } LS_UNION_; typedef struct { UNS16 count; /* allocation count */ LS_UNION_ ls; } INTER_; typedef union { INT16 intval; /* value of an int */ INTER_ *i; /* intermediate alloc. structure */ } VAR_UNION_; typedef struct /* defined variable */ { E_TYPE_ type; /* maybe stringconst, int, list */ VAR_UNION_ vu; /* value of the element */ } VAR_; #ifndef MSDOS struct _find_t /* abbreviated variant */ { char name[_MAX_PATH]; unsigned attrib; /* returned attribute */ }; #endif typedef struct { unsigned attrib; /* requested attribute */ struct _find_t find; /* _dos_find...()'s struct */ } ICMAKE_FIND_; BIN_HEADER_ *readheader (FILE *, unsigned); extern ICMAKE_FIND_ ifs; /* in: ./rss/findnext.c */ /* replacement functions for non-dos systems */ #ifndef MSDOS void _makepath(char *, const char *, const char *, const char *, const char *); void _splitpath(const char *, char *, char *, char *, char *); unsigned _dos_findfirst(char *, unsigned, struct _find_t *); unsigned _dos_findnext(struct _find_t *); /* ICCE getopt functions */ int ic_getoptindex(void); int ic_getopt(int *, char **); char *ic_getoptval(int *, char **); /* and their mappings */ #define getoptindex ic_getoptindex #define getopt ic_getopt #define getoptval ic_getoptval int _spawnlp(int, const char *, const char *, ...); /* ok */ int _spawnvp(int, const char *, const char **); /* ok */ void copyright(char *, char *, char *, int); /* ok */ char *program_name(char *); /* ok */ unsigned redirect_start(unsigned, unsigned); /* ok */ char *_strlwr(char *); /* ok */ #define _heapmin() char *stresc(char *); /* ok */ int chesc(char *, int *); /* ok */ char *fgetz (char *, unsigned, FILE *); /* ok */ #endif /* MSDOS */ char *change_ext (char *, char *); char *change_base (char *, char *); char *change_path (char *, char *); char *filefound(); /* test attrib/pattern */ char *findfirst(char *, unsigned); /* first entry matching pattern */ char *findnext(); /* remaining matching entries */ char *get_ext (char*); char *get_base (char*); char *get_path (char*); char *getstring (FILE *, INT32, UNS16); char *hexstring (UNS16, UNS16); char *xstrdup (char *); char *xstrcat (char *, char *); void error (char *, ...); void spawn_err (char *); void *xrealloc (void *, int); int exists (char *); int older (char *, char *); int younger (char *, char *); INT16 getint16 (FILE *); OPCODE_ getopcode (FILE *); UNS16 getvar (FILE *, BIN_HEADER_ *, VAR_ **); VAR_ initvar (VAR_);