mirrors/tinycc
1
0
Fork 0
mirror of https://github.com/frida/tinycc synced 2024-11-28 10:33:07 +03:00
Code Issues Packages Projects Releases Wiki Activity
8523baf61d
tinycc/tcc.c
bellard 8523baf61d better external allocs handling
2001-12-05 00:45:08 +00:00

3804 lines
101 KiB
C
Raw Blame History

/*
* TCC - Tiny C Compiler
*
* Copyright (c) 2001 Fabrice Bellard
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <tcclib.h>
//#define DEBUG
/* preprocessor debug */
//#define PP_DEBUG
/* these sizes are dummy for unix, because malloc() does not use
memory when the pages are not used */
#define TEXT_SIZE (4*1024*1024)
#define DATA_SIZE (4*1024*1024)
#define INCLUDE_STACK_SIZE 32
#define IFDEF_STACK_SIZE 64
#define VSTACK_SIZE 64
#define STRING_MAX_SIZE 1024
#define INCLUDE_PATHS_MAX 32
#define TOK_HASH_SIZE 521
#define TOK_ALLOC_INCR 256 /* must be a power of two */
#define SYM_HASH_SIZE 263
/* number of available temporary registers */
#define NB_REGS 3
/* return register for functions */
#define FUNC_RET_REG 0
/* defined if function parameters must be evaluated in reverse order */
#define INVERT_FUNC_PARAMS
/* defined if structures are passed as pointers. Otherwise structures
are directly pushed on stack. */
//#define FUNC_STRUCT_PARAM_AS_PTR
/* token symbol management */
typedef struct TokenSym {
struct TokenSym *hash_next;
int tok; /* token number */
int len;
char str[1];
} TokenSym;
/* symbol management */
typedef struct Sym {
int v; /* symbol token */
int t; /* associated type */
int c; /* associated number */
struct Sym *next; /* next related symbol */
struct Sym *prev; /* prev symbol in stack */
struct Sym *hash_next; /* next symbol in hash table */
} Sym;
typedef struct SymStack {
struct Sym *top;
struct Sym *hash[SYM_HASH_SIZE];
} SymStack;
/* relocation entry (currently only used for functions or variables */
typedef struct Reloc {
int type; /* type of relocation */
int addr; /* address of relocation */
struct Reloc *next; /* next relocation */
} Reloc;
#define RELOC_ADDR32 1 /* 32 bits relocation */
#define RELOC_REL32 2 /* 32 bits relative relocation */
#define SYM_STRUCT 0x40000000 /* struct/union/enum symbol space */
#define SYM_FIELD 0x20000000 /* struct/union field symbol space */
#define FUNC_NEW 1 /* ansi function prototype */
#define FUNC_OLD 2 /* old function prototype */
#define FUNC_ELLIPSIS 3 /* ansi function prototype with ... */
/* field 'Sym.t' for macros */
#define MACRO_OBJ 0 /* object like macro */
#define MACRO_FUNC 1 /* function like macro */
/* type_decl() types */
#define TYPE_ABSTRACT 1 /* type without variable */
#define TYPE_DIRECT 2 /* type with variable */
typedef struct {
FILE *file;
char *filename;
int line_num;
} IncludeFile;
/* loc : local variable index
glo : global variable index
ind : output code ptr
rsym: return symbol
prog: output code
anon_sym: anonymous symbol index
*/
FILE *file;
int tok, tok1, tokc, rsym, anon_sym,
prog, ind, loc, glo, vt, vc, const_wanted, line_num;
int global_expr; /* true if compound literals must be allocated
globally (used during initializers parsing */
int func_vt, func_vc; /* current function return type (used by
return instruction) */
int tok_ident;
TokenSym **table_ident;
TokenSym *hash_ident[521];
char token_buf[STRING_MAX_SIZE + 1];
char *filename, *funcname;
SymStack define_stack, global_stack, local_stack, label_stack;
int vstack[VSTACK_SIZE], *vstack_ptr;
int *macro_ptr, *macro_ptr_allocated;
IncludeFile include_stack[INCLUDE_STACK_SIZE], *include_stack_ptr;
int ifdef_stack[IFDEF_STACK_SIZE], *ifdef_stack_ptr;
char *include_paths[INCLUDE_PATHS_MAX];
int nb_include_paths;
/* The current value can be: */
#define VT_VALMASK 0x000f
#define VT_CONST 0x000a /* constant in vc
(must be first non register value) */
#define VT_LLOCAL 0x000b /* lvalue, offset on stack */
#define VT_LOCAL 0x000c /* offset on stack */
#define VT_CMP 0x000d /* the value is stored in processor flags (in vc) */
#define VT_JMP 0x000e /* value is the consequence of jmp true */
#define VT_JMPI 0x000f /* value is the consequence of jmp false */
#define VT_LVAL 0x0010 /* var is an lvalue */
#define VT_LVALN -17 /* ~VT_LVAL */
#define VT_FORWARD 0x0020 /* value is forward reference
(only used for functions) */
/* types */
#define VT_INT 0
#define VT_VOID 0x00040
#define VT_BYTE 0x00080 /* signed byte type */
#define VT_PTR 0x00100 /* pointer increment */
#define VT_UNSIGNED 0x00200 /* unsigned type */
#define VT_ARRAY 0x00400 /* array type (only used in parsing) */
#define VT_ENUM 0x00800 /* enum definition */
#define VT_FUNC 0x01000 /* function type */
#define VT_STRUCT 0x002000 /* struct/union definition */
#define VT_SHORT 0x004000 /* short type */
#define VT_STRUCT_SHIFT 18 /* structure/enum name shift (14 bits left) */
/* storage */
#define VT_EXTERN 0x00008000 /* extern definition */
#define VT_STATIC 0x00010000 /* static variable */
#define VT_TYPEDEF 0x00020000 /* typedef definition */
#define VT_TYPE 0xfffc7fc0 /* type mask */
#define VT_TYPEN 0x0000003f /* ~VT_TYPE */
#define VT_FUNCN -4097 /* ~VT_FUNC */
/* token values */
/* warning: the following compare tokens depend on i386 asm code */
#define TOK_ULT 0x92
#define TOK_UGE 0x93
#define TOK_EQ 0x94
#define TOK_NE 0x95
#define TOK_ULE 0x96
#define TOK_UGT 0x97
#define TOK_LT 0x9c
#define TOK_GE 0x9d
#define TOK_LE 0x9e
#define TOK_GT 0x9f
#define TOK_LAND 0xa0
#define TOK_LOR 0xa1
#define TOK_DEC 0xa2
#define TOK_MID 0xa3 /* inc/dec, to void constant */
#define TOK_INC 0xa4
#define TOK_ARROW 0xa7
#define TOK_DOTS 0xa8 /* three dots */
#define TOK_SHR 0xa9 /* unsigned shift right */
#define TOK_UDIV 0xb0 /* unsigned division */
#define TOK_UMOD 0xb1 /* unsigned modulo */
#define TOK_PDIV 0xb2 /* fast division with undefined rounding for pointers */
#define TOK_NUM 0xb3 /* number in tokc */
#define TOK_CCHAR 0xb4 /* char constant in tokc */
#define TOK_STR 0xb5 /* pointer to string in tokc */
#define TOK_TWOSHARPS 0xb6 /* ## preprocessing token */
#define TOK_LCHAR 0xb7
#define TOK_LSTR 0xb8
#define TOK_SHL 0x01 /* shift left */
#define TOK_SAR 0x02 /* signed shift right */
/* assignement operators : normal operator or 0x80 */
#define TOK_A_MOD 0xa5
#define TOK_A_AND 0xa6
#define TOK_A_MUL 0xaa
#define TOK_A_ADD 0xab
#define TOK_A_SUB 0xad
#define TOK_A_DIV 0xaf
#define TOK_A_XOR 0xde
#define TOK_A_OR 0xfc
#define TOK_A_SHL 0x81
#define TOK_A_SAR 0x82
/* all identificators and strings have token above that */
#define TOK_IDENT 256
enum {
TOK_INT = TOK_IDENT,
TOK_VOID,
TOK_CHAR,
TOK_IF,
TOK_ELSE,
TOK_WHILE,
TOK_BREAK,
TOK_RETURN,
TOK_FOR,
TOK_EXTERN,
TOK_STATIC,
TOK_UNSIGNED,
TOK_GOTO,
TOK_DO,
TOK_CONTINUE,
TOK_SWITCH,
TOK_CASE,
/* ignored types Must have contiguous values */
TOK_CONST,
TOK_VOLATILE,
TOK_LONG,
TOK_REGISTER,
TOK_SIGNED,
TOK_AUTO,
TOK_INLINE,
TOK_RESTRICT,
/* unsupported type */
TOK_FLOAT,
TOK_DOUBLE,
TOK_SHORT,
TOK_STRUCT,
TOK_UNION,
TOK_TYPEDEF,
TOK_DEFAULT,
TOK_ENUM,
TOK_SIZEOF,
/* preprocessor only */
TOK_DEFINE,
TOK_INCLUDE,
TOK_IFDEF,
TOK_IFNDEF,
TOK_ELIF,
TOK_ENDIF,
TOK_DEFINED,
TOK_UNDEF,
TOK_ERROR,
TOK_LINE,
TOK___LINE__,
TOK___FILE__,
TOK___DATE__,
TOK___TIME__,
TOK___VA_ARGS__,
/* special identifiers */
TOK___FUNC__,
TOK_MAIN,
};
void sum();
void next(void);
void next_nomacro();
int expr_const();
void expr_eq();
void expr(void);
void decl(int l);
void decl_initializer(int t, int c, int first, int size_only);
int decl_initializer_alloc(int t, int has_init);
int gv(void);
void move_reg();
void save_reg();
void vpush(void);
int get_reg(void);
void macro_subst(int **tok_str, int *tok_len,
Sym **nested_list, int *macro_str);
int save_reg_forced(int r);
void vstore(void);
int type_size(int t, int *a);
int pointed_type(int t);
int pointed_size(int t);
int ist(void);
int type_decl(int *v, int t, int td);
#ifdef PROFILE
/* dummy function for profiling */
void *dlopen(const char *filename, int flag)
{
return (void *)1;
}
const char *dlerror(void)
{
return "error";
}
void *dlsym(void *handle, char *symbol)
{
return (void *)1;
}
#endif
inline int isid(c)
{
return (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
c == '_';
}
inline int isnum(c)
{
return c >= '0' & c <= '9';
}
void printline()
{
IncludeFile *f;
for(f = include_stack; f < include_stack_ptr; f++)
fprintf(stderr, "In file included from %s:%d:\n",
f->filename, f->line_num);
fprintf(stderr, "%s:%d: ", filename, line_num);
}
void error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
printline();
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
exit(1);
va_end(ap);
}
void expect(const char *msg)
{
error("%s expected", msg);
}
void warning(const char *msg)
{
printline();
fprintf(stderr, "warning: %s\n", msg);
}
void skip(c)
{
if (tok != c)
error("'%c' expected", c);
next();
}
void test_lvalue()
{
if (!(vt & VT_LVAL))
expect("lvalue");
}
TokenSym *tok_alloc(char *str, int len)
{
TokenSym *ts, **pts, **ptable;
int h, i;
if (len <= 0)
len = strlen(str);
h = 1;
for(i=0;i<len;i++)
h = ((h << 8) | (str[i] & 0xff)) % TOK_HASH_SIZE;
pts = &hash_ident[h];
while (1) {
ts = *pts;
if (!ts)
break;
if (ts->len == len && !memcmp(ts->str, str, len))
return ts;
pts = &(ts->hash_next);
}
/* expand token table if needed */
i = tok_ident - TOK_IDENT;
if ((i % TOK_ALLOC_INCR) == 0) {
ptable = realloc(table_ident, (i + TOK_ALLOC_INCR) * sizeof(TokenSym *));
if (!ptable)
error("memory full");
table_ident = ptable;
}
ts = malloc(sizeof(TokenSym) + len);
if (!ts)
error("memory full");
table_ident[i] = ts;
ts->tok = tok_ident++;
ts->len = len;
ts->hash_next = NULL;
memcpy(ts->str, str, len + 1);
*pts = ts;
return ts;
}
void add_char(char **pp, int c)
{
char *p;
p = *pp;
if (c == '\'' || c == '\"' || c == '\\') {
/* XXX: could be more precise if char or string */
*p++ = '\\';
}
if (c >= 32 && c <= 126) {
*p++ = c;
} else {
*p++ = '\\';
if (c == '\n') {
*p++ = 'n';
} else {
*p++ = '0' + ((c >> 6) & 7);
*p++ = '0' + ((c >> 3) & 7);
*p++ = '0' + (c & 7);
}
}
*pp = p;
}
/* XXX: buffer overflow */
char *get_tok_str(int v, int c)
{
static char buf[STRING_MAX_SIZE + 1];
TokenSym *ts;
char *p;
int i;
if (v == TOK_NUM) {
sprintf(buf, "%d", c);
return buf;
} else if (v == TOK_CCHAR || v == TOK_LCHAR) {
p = buf;
*p++ = '\'';
add_char(&p, c);
*p++ = '\'';
*p = '\0';
return buf;
} else if (v == TOK_STR || v == TOK_LSTR) {
ts = (TokenSym *)c;
p = buf;
*p++ = '\"';
for(i=0;i<ts->len;i++)
add_char(&p, ts->str[i]);
*p++ = '\"';
*p = '\0';
return buf;
} else if (v < TOK_IDENT) {
p = buf;
*p++ = v;
*p = '\0';
return buf;
} else if (v < tok_ident) {
return table_ident[v - TOK_IDENT]->str;
} else {
/* should never happen */
return NULL;
}
}
/* push, without hashing */
Sym *sym_push2(Sym **ps, int v, int t, int c)
{
Sym *s;
s = malloc(sizeof(Sym));
if (!s)
error("memory full");
s->v = v;
s->t = t;
s->c = c;
s->next = NULL;
/* add in stack */
s->prev = *ps;
*ps = s;
return s;
}
/* find a symbol and return its associated structure. 's' is the top
of the symbol stack */
Sym *sym_find2(Sym *s, int v)
{
while (s) {
if (s->v == v)
return s;
s = s->prev;
}
return NULL;
}
/* find a symbol and return its associated structure. 'st' is the
symbol stack */
Sym *sym_find1(SymStack *st, int v)
{
Sym *s;
s = st->hash[v % SYM_HASH_SIZE];
while (s) {
if (s->v == v)
return s;
s = s->hash_next;
}
return 0;
}
Sym *sym_push1(SymStack *st, int v, int t, int c)
{
Sym *s, **ps;
s = sym_push2(&st->top, v, t, c);
/* add in hash table */
ps = &st->hash[s->v % SYM_HASH_SIZE];
s->hash_next = *ps;
*ps = s;
return s;
}
/* find a symbol in the right symbol space */
Sym *sym_find(int v)
{
Sym *s;
s = sym_find1(&local_stack, v);
if (!s)
s = sym_find1(&global_stack, v);
return s;
}
/* push a given symbol on the symbol stack */
Sym *sym_push(int v, int t, int c)
{
if (local_stack.top)
return sym_push1(&local_stack, v, t, c);
else
return sym_push1(&global_stack, v, t, c);
}
/* pop symbols until top reaches 'b' */
void sym_pop(SymStack *st, Sym *b)
{
Sym *s, *ss;
s = st->top;
while(s != b) {
ss = s->prev;
/* free hash table entry */
st->hash[s->v % SYM_HASH_SIZE] = s->hash_next;
free(s);
s = ss;
}
st->top = b;
}
int ch, ch1;
/* read next char from current input file */
void inp()
{
redo:
ch1 = fgetc(file);
if (ch1 == -1) {
if (include_stack_ptr == include_stack)
return;
/* pop include stack */
fclose(file);
free(filename);
include_stack_ptr--;
file = include_stack_ptr->file;
filename = include_stack_ptr->filename;
line_num = include_stack_ptr->line_num;
goto redo;
}
if (ch1 == '\n')
line_num++;
// printf("ch1=%c 0x%x\n", ch1, ch1);
}
/* input with '\\n' handling */
void minp()
{
redo:
ch = ch1;
inp();
if (ch == '\\' && ch1 == '\n') {
inp();
goto redo;
}
//printf("ch=%c 0x%x\n", ch, ch);
}
/* same as minp, but also skip comments */
void cinp()
{
int c;
if (ch1 == '/') {
inp();
if (ch1 == '/') {
/* single line C++ comments */
inp();
while (ch1 != '\n' && ch1 != -1)
inp();
inp();
ch = ' '; /* return space */
} else if (ch1 == '*') {
/* C comments */
inp();
while (ch1 != -1) {
c = ch1;
inp();
if (c == '*' && ch1 == '/') {
inp();
ch = ' '; /* return space */
break;
}
}
} else {
ch = '/';
}
} else {
minp();
}
}
void skip_spaces()
{
while (ch == ' ' || ch == '\t')
cinp();
}
/* skip block of text until #else, #elif or #endif. skip also pairs of
#if/#endif */
void preprocess_skip()
{
int a;
a = 0;
while (1) {
while (ch != '\n') {
if (ch == -1)
expect("#endif");
cinp();
}
cinp();
skip_spaces();
if (ch == '#') {
cinp();
next_nomacro();
if (a == 0 &&
(tok == TOK_ELSE || tok == TOK_ELIF || tok == TOK_ENDIF))
break;
if (tok == TOK_IF || tok == TOK_IFDEF || tok == TOK_IFNDEF)
a++;
else if (tok == TOK_ENDIF)
a--;
}
}
}
inline int is_long_tok(int t)
{
return (t == TOK_NUM ||
t == TOK_CCHAR || t == TOK_LCHAR ||
t == TOK_STR || t == TOK_LSTR);
}
void tok_add(int **tok_str, int *tok_len, int t)
{
int len, *str;
len = *tok_len;
str = *tok_str;
if ((len & 63) == 0) {
str = realloc(str, (len + 64) * sizeof(int));
if (!str)
return;
*tok_str = str;
}
str[len++] = t;
*tok_len = len;
}
void tok_add2(int **tok_str, int *tok_len, int t, int c)
{
tok_add(tok_str, tok_len, t);
if (is_long_tok(t))
tok_add(tok_str, tok_len, c);
}
/* eval an expression for #if/#elif */
int expr_preprocess()
{
int *str, len, c, t;
str = NULL;
len = 0;
while (1) {
skip_spaces();
if (ch == '\n')
break;
next(); /* do macro subst */
if (tok == TOK_DEFINED) {
next_nomacro();
t = tok;
if (t == '(')
next_nomacro();
c = sym_find1(&define_stack, tok) != 0;
if (t == '(')
next_nomacro();
tok = TOK_NUM;
tokc = c;
} else if (tok >= TOK_IDENT) {
/* if undefined macro */
tok = TOK_NUM;
tokc = 0;
}
tok_add2(&str, &len, tok, tokc);
}
tok_add(&str, &len, -1); /* simulate end of file */
tok_add(&str, &len, 0);
/* now evaluate C constant expression */
macro_ptr = str;
next();
c = expr_const();
macro_ptr = NULL;
free(str);
return c != 0;
}
#ifdef DEBUG
void tok_print(int *str)
{
int t, c;
while (1) {
t = *str++;
if (!t)
break;
c = 0;
if (is_long_tok(t))
c = *str++;
printf(" %s", get_tok_str(t, c));
}
printf("\n");
}
#endif
/* XXX: should be more factorized */
void define_symbol(char *sym)
{
TokenSym *ts;
int *str, len;
ts = tok_alloc(sym, 0);
str = NULL;
len = 0;
tok_add2(&str, &len, TOK_NUM, 1);
tok_add(&str, &len, 0);
sym_push1(&define_stack, ts->tok, MACRO_OBJ, (int)str);
}
void preprocess()
{
int size, i, c, v, t, *str, len;
char buf[1024], *q, *p;
char buf1[1024];
FILE *f;
Sym **ps, *first, *s;
cinp();
next_nomacro();
redo:
if (tok == TOK_DEFINE) {
next_nomacro();
v = tok;
/* XXX: should check if same macro (ANSI) */
first = NULL;
t = MACRO_OBJ;
/* '(' must be just after macro definition for MACRO_FUNC */
if (ch == '(') {
next_nomacro();
next_nomacro();
ps = &first;
while (tok != ')') {
if (tok == TOK_DOTS)
tok = TOK___VA_ARGS__;
s = sym_push1(&define_stack, tok | SYM_FIELD, 0, 0);
*ps = s;
ps = &s->next;
next_nomacro();
if (tok != ',')
break;
next_nomacro();
}
t = MACRO_FUNC;
}
str = NULL;
len = 0;
while (1) {
skip_spaces();
if (ch == '\n' || ch == -1)
break;
next_nomacro();
tok_add2(&str, &len, tok, tokc);
}
tok_add(&str, &len, 0);
#ifdef PP_DEBUG
printf("define %s %d: ", get_tok_str(v, 0), t);
tok_print(str);
#endif
s = sym_push1(&define_stack, v, t, (int)str);
s->next = first;
} else if (tok == TOK_UNDEF) {
next_nomacro();
s = sym_find1(&define_stack, tok);
/* undefine symbol by putting an invalid name */
if (s)
s->v = 0;
} else if (tok == TOK_INCLUDE) {
skip_spaces();
if (ch == '<') {
c = '>';
goto read_name;
} else if (ch == '\"') {
c = ch;
read_name:
minp();
q = buf;
while (ch != c && ch != '\n' && ch != -1) {
if ((q - buf) < sizeof(buf) - 1)
*q++ = ch;
minp();
}
*q = '\0';
} else {
next();
if (tok != TOK_STR)
error("#include syntax error");
/* XXX: buffer overflow */
strcpy(buf, get_tok_str(tok, tokc));
c = '\"';
}
if (include_stack_ptr >= include_stack + INCLUDE_STACK_SIZE)
error("memory full");
if (c == '\"') {
/* first search in current dir if "header.h" */
/* XXX: buffer overflow */
size = 0;
p = strrchr(filename, '/');
if (p)
size = p + 1 - filename;
memcpy(buf1, filename, size);
buf1[size] = '\0';
strcat(buf1, buf);
f = fopen(buf1, "r");
if (f)
goto found;
}
/* now search in standard include path */
for(i=nb_include_paths - 1;i>=0;i--) {
strcpy(buf1, include_paths[i]);
strcat(buf1, "/");
strcat(buf1, buf);
f = fopen(buf1, "r");
if (f)
goto found;
}
error("include file not found");
f = NULL;
found:
/* push current file in stack */
/* XXX: fix current line init */
include_stack_ptr->file = file;
include_stack_ptr->filename = filename;
include_stack_ptr->line_num = line_num;
include_stack_ptr++;
file = f;
filename = strdup(buf1);
line_num = 1;
} else if (tok == TOK_IFNDEF) {
c = 1;
goto do_ifdef;
} else if (tok == TOK_IF) {
c = expr_preprocess();
goto do_if;
} else if (tok == TOK_IFDEF) {
c = 0;
do_ifdef:
next_nomacro();
c = (sym_find1(&define_stack, tok) != 0) ^ c;
do_if:
if (ifdef_stack_ptr >= ifdef_stack + IFDEF_STACK_SIZE)
error("memory full");
*ifdef_stack_ptr++ = c;
goto test_skip;
} else if (tok == TOK_ELSE) {
if (ifdef_stack_ptr == ifdef_stack ||
(ifdef_stack_ptr[-1] & 2))
error("#else after #else");
c = (ifdef_stack_ptr[-1] ^= 3);
goto test_skip;
} else if (tok == TOK_ELIF) {
if (ifdef_stack_ptr == ifdef_stack ||
ifdef_stack_ptr[-1] > 1)
error("#elif after #else");
c = expr_preprocess();
ifdef_stack_ptr[-1] = c;
test_skip:
if (!(c & 1)) {
preprocess_skip();
goto redo;
}
} else if (tok == TOK_ENDIF) {
if (ifdef_stack_ptr == ifdef_stack)
expect("#if");
ifdef_stack_ptr--;
} else if (tok == TOK_LINE) {
next();
if (tok != TOK_NUM)
error("#line");
line_num = tokc;
skip_spaces();
if (ch != '\n') {
next();
if (tok != TOK_STR)
error("#line");
/* XXX: potential memory leak */
filename = strdup(get_tok_str(tok, tokc));
}
} else if (tok == TOK_ERROR) {
error("#error");
}
/* ignore other preprocess commands or #! for C scripts */
while (ch != '\n' && ch != -1)
cinp();
}
/* read a number in base b */
int getn(b)
{
int n, t;
n = 0;
while (1) {
if (ch >= 'a' & ch <= 'f')
t = ch - 'a' + 10;
else if (ch >= 'A' & ch <= 'F')
t = ch - 'A' + 10;
else if (isnum(ch))
t = ch - '0';
else
break;
if (t < 0 | t >= b)
break;
n = n * b + t;
cinp();
}
return n;
}
/* read a character for string or char constant and eval escape codes */
int getq()
{
int c;
c = ch;
minp();
if (c == '\\') {
if (isnum(ch)) {
/* at most three octal digits */
c = ch - '0';
minp();
if (isnum(ch)) {
c = c * 8 + ch - '0';
minp();
if (isnum(ch)) {
c = c * 8 + ch - '0';
minp();
}
}
return c;
} else if (ch == 'x') {
minp();
return getn(16);
} else {
if (ch == 'a')
c = '\a';
else if (ch == 'b')
c = '\b';
else if (ch == 'f')
c = '\f';
else if (ch == 'n')
c = '\n';
else if (ch == 'r')
c = '\r';
else if (ch == 't')
c = '\t';
else if (ch == 'v')
c = '\v';
else
c = ch;
minp();
}
}
return c;
}
/* return next token without macro substitution */
void next_nomacro1()
{
int b;
char *q;
TokenSym *ts;
/* skip spaces */
while(1) {
while (ch == '\n') {
cinp();
while (ch == ' ' || ch == 9)
cinp();
if (ch == '#') {
/* preprocessor command if # at start of line after
spaces */
preprocess();
}
}
if (ch != ' ' && ch != '\t' && ch != '\f')
break;
cinp();
}
if (isid(ch)) {
q = token_buf;
*q++ = ch;
cinp();
if (q[-1] == 'L') {
/* XXX: not supported entirely (needs different
preprocessor architecture) */
if (ch == '\'') {
tok = TOK_LCHAR;
goto char_const;
}
if (ch == '\"') {
tok = TOK_LSTR;
goto str_const;
}
}
while (isid(ch) | isnum(ch)) {
if (q >= token_buf + STRING_MAX_SIZE)
error("ident too long");
*q++ = ch;
cinp();
}
*q = '\0';
ts = tok_alloc(token_buf, q - token_buf);
tok = ts->tok;
} else if (isnum(ch)) {
/* number */
b = 10;
if (ch == '0') {
cinp();
b = 8;
if (ch == 'x' || ch == 'X') {
cinp();
b = 16;
} else if (ch == 'b' || ch == 'B') {
cinp();
b = 2;
}
}
tokc = getn(b);
/* XXX: add unsigned constant support (ANSI) */
while (ch == 'L' || ch == 'l' || ch == 'U' || ch == 'u')
cinp();
tok = TOK_NUM;
} else if (ch == '\'') {
tok = TOK_CCHAR;
char_const:
minp();
tokc = getq();
if (ch != '\'')
expect("\'");
minp();
} else if (ch == '\"') {
tok = TOK_STR;
str_const:
minp();
q = token_buf;
while (ch != '\"') {
b = getq();
if (ch == -1)
error("unterminated string");
if (q >= token_buf + STRING_MAX_SIZE)
error("string too long");
*q++ = b;
}
*q = '\0';
tokc = (int)tok_alloc(token_buf, q - token_buf);
minp();
} else {
q = "<=\236>=\235!=\225&&\240||\241++\244--\242==\224<<\1>>\2+=\253-=\255*=\252/=\257%=\245&=\246^=\336|=\374->\247..\250##\266";
/* two chars */
tok = ch;
cinp();
while (*q) {
if (*q == tok & q[1] == ch) {
cinp();
tok = q[2] & 0xff;
/* three chars tests */
if (tok == TOK_SHL | tok == TOK_SAR) {
if (ch == '=') {
tok = tok | 0x80;
cinp();
}
} else if (tok == TOK_DOTS) {
if (ch != '.')
error("parse error");
cinp();
}
return;
}
q = q + 3;
}
/* single char substitutions */
if (tok == '<')
tok = TOK_LT;
else if (tok == '>')
tok = TOK_GT;
}
}
/* return next token without macro substitution. Can read input from
macro_ptr buffer */
void next_nomacro()
{
if (macro_ptr) {
tok = *macro_ptr;
if (tok) {
macro_ptr++;
if (is_long_tok(tok))
tokc = *macro_ptr++;
}
} else {
next_nomacro1();
}
}
/* substitute args in macro_str and return allocated string */
int *macro_arg_subst(Sym **nested_list, int *macro_str, Sym *args)
{
int *st, last_tok, t, c, notfirst, *str, len;
Sym *s;
TokenSym *ts;
str = NULL;
len = 0;
last_tok = 0;
while(1) {
t = *macro_str++;
if (!t)
break;
if (t == '#') {
/* stringize */
t = *macro_str++;
if (!t)
break;
s = sym_find2(args, t);
if (s) {
token_buf[0] = '\0';
st = (int *)s->c;
/* XXX: buffer overflow */
notfirst = 0;
while (*st) {
if (notfirst)
strcat(token_buf, " ");
t = *st++;
c = 0;
if (is_long_tok(t))
c = *st++;
strcat(token_buf, get_tok_str(t, c));
notfirst = 1;
}
#ifdef PP_DEBUG
printf("stringize: %s\n", token_buf);
#endif
/* add string */
ts = tok_alloc(token_buf, 0);
tok_add2(&str, &len, TOK_STR, (int)ts);
} else {
tok_add(&str, &len, t);
}
} else if (is_long_tok(t)) {
tok_add2(&str, &len, t, *macro_str++);
} else {
s = sym_find2(args, t);
if (s) {
st = (int *)s->c;
/* if '##' is present before or after , no arg substitution */
if (*macro_str == TOK_TWOSHARPS || last_tok == TOK_TWOSHARPS) {
while (*st)
tok_add(&str, &len, *st++);
} else {
macro_subst(&str, &len, nested_list, st);
}
} else {
tok_add(&str, &len, t);
}
}
last_tok = t;
}
tok_add(&str, &len, 0);
return str;
}
/* handle the '##' operator */
int *macro_twosharps(int *macro_str)
{
TokenSym *ts;
int *macro_str1, macro_str1_len, *macro_ptr1;
int t, c;
char *p;
macro_str1 = NULL;
macro_str1_len = 0;
tok = 0;
while (1) {
next_nomacro();
if (tok == 0)
break;
if (*macro_ptr == TOK_TWOSHARPS) {
macro_ptr++;
macro_ptr1 = macro_ptr;
t = *macro_ptr;
if (t) {
macro_ptr++;
c = 0;
if (is_long_tok(t))
c = *macro_ptr++;
/* XXX: we handle only most common cases:
ident + ident or ident + number */
if (tok >= TOK_IDENT &&
(t >= TOK_IDENT || t == TOK_NUM)) {
/* XXX: buffer overflow */
p = get_tok_str(tok, tokc);
strcpy(token_buf, p);
p = get_tok_str(t, c);
strcat(token_buf, p);
ts = tok_alloc(token_buf, 0);
tok_add2(&macro_str1, &macro_str1_len, ts->tok, 0);
} else {
/* cannot merge tokens: skip '##' */
macro_ptr = macro_ptr1;
}
}
} else {
tok_add2(&macro_str1, &macro_str1_len, tok, tokc);
}
}
tok_add(&macro_str1, &macro_str1_len, 0);
return macro_str1;
}
/* do macro substitution of macro_str and add result to
(tok_str,tok_len). If macro_str is NULL, then input stream token is
substituted. 'nested_list' is the list of all macros we got inside
to avoid recursing. */
void macro_subst(int **tok_str, int *tok_len,
Sym **nested_list, int *macro_str)
{
Sym *s, *args, *sa, *sa1;
int *str, parlevel, len, *mstr, t, *saved_macro_ptr;
int mstr_allocated, *macro_str1;
saved_macro_ptr = macro_ptr;
macro_ptr = macro_str;
macro_str1 = NULL;
if (macro_str) {
/* first scan for '##' operator handling */
macro_str1 = macro_twosharps(macro_str);
macro_ptr = macro_str1;
}
while (1) {
next_nomacro();
if (tok == 0)
break;
/* special macros */
if (tok == TOK___LINE__) {
tok_add2(tok_str, tok_len, TOK_NUM, line_num);
} else if (tok == TOK___FILE__) {
tok_add2(tok_str, tok_len, TOK_STR,
(int)tok_alloc(filename, 0));
} else if (tok == TOK___DATE__) {
tok_add2(tok_str, tok_len, TOK_STR,
(int)tok_alloc("Jan 1 1970", 0));
} else if (tok == TOK___TIME__) {
tok_add2(tok_str, tok_len, TOK_STR,
(int)tok_alloc("00:00:00", 0));
} else if ((s = sym_find1(&define_stack, tok)) != NULL) {
/* if symbol is a macro, prepare substitution */
/* if nested substitution, do nothing */
if (sym_find2(*nested_list, tok))
goto no_subst;
mstr = (int *)s->c;
mstr_allocated = 0;
if (s->t == MACRO_FUNC) {
/* NOTE: we do not use next_nomacro to avoid eating the
next token. XXX: find better solution */
if (macro_ptr) {
t = *macro_ptr;
} else {
while (ch == ' ' || ch == '\t' || ch == '\n')
cinp();
t = ch;
}
if (t != '(') /* no macro subst */
goto no_subst;
/* argument macro */
next_nomacro();
next_nomacro();
args = NULL;
sa = s->next;
while (tok != ')' && sa) {
len = 0;
str = NULL;
parlevel = 0;
while ((parlevel > 0 ||
(tok != ')' &&
(tok != ',' ||
sa->v == (TOK___VA_ARGS__ | SYM_FIELD)))) &&
tok != -1) {
if (tok == '(')
parlevel++;
else if (tok == ')')
parlevel--;
tok_add2(&str, &len, tok, tokc);
next_nomacro();
}
tok_add(&str, &len, 0);
sym_push2(&args, sa->v & ~SYM_FIELD, 0, (int)str);
if (tok != ',')
break;
next_nomacro();
sa = sa->next;
}
if (tok != ')')
expect(")");
/* now subst each arg */
mstr = macro_arg_subst(nested_list, mstr, args);
/* free memory */
sa = args;
while (sa) {
sa1 = sa->prev;
free((int *)sa->c);
free(sa);
sa = sa1;
}
mstr_allocated = 1;
}
sym_push2(nested_list, s->v, 0, 0);
macro_subst(tok_str, tok_len, nested_list, mstr);
/* pop nested defined symbol */
sa1 = *nested_list;
*nested_list = sa1->prev;
free(sa1);
if (mstr_allocated)
free(mstr);
} else {
no_subst:
/* no need to add if reading input stream */
if (!macro_str)
return;
tok_add2(tok_str, tok_len, tok, tokc);
}
/* only replace one macro while parsing input stream */
if (!macro_str)
return;
}
macro_ptr = saved_macro_ptr;
if (macro_str1)
free(macro_str1);
}
/* return next token with macro substitution */
void next()
{
int len, *ptr;
Sym *nested_list;
/* special 'ungettok' case for label parsing */
if (tok1) {
tok = tok1;
tok1 = 0;
} else {
redo:
if (!macro_ptr) {
/* if not reading from macro substuted string, then try to substitute */
len = 0;
ptr = NULL;
nested_list = NULL;
macro_subst(&ptr, &len, &nested_list, NULL);
if (ptr) {
tok_add(&ptr, &len, 0);
macro_ptr = ptr;
macro_ptr_allocated = ptr;
goto redo;
}
if (tok == 0)
goto redo;
} else {
next_nomacro();
if (tok == 0) {
/* end of macro string: free it */
free(macro_ptr_allocated);
macro_ptr = NULL;
goto redo;
}
}
}
#ifdef DEBUG
printf("token = %s\n", get_tok_str(tok, tokc));
#endif
}
void swap(int *p, int *q)
{
int t;
t = *p;
*p = *q;
*q = t;
}
void vset(t, v)
{
vt = t;
vc = v;
}
/******************************************************/
/* X86 code generator */
typedef struct GFuncContext {
int args_size;
} GFuncContext;
void g(int c)
{
*(char *)ind++ = c;
}
void o(int c)
{
while (c) {
g(c);
c = c / 256;
}
}
void gen_le32(int c)
{
g(c);
g(c >> 8);
g(c >> 16);
g(c >> 24);
}
/* add a new relocation entry to symbol 's' */
void greloc(Sym *s, int addr, int type)
{
Reloc *p;
p = malloc(sizeof(Reloc));
if (!p)
error("memory full");
p->type = type;
p->addr = addr;
p->next = (Reloc *)s->c;
s->c = (int)p;
}
/* patch each relocation entry with value 'val' */
void greloc_patch(Sym *s, int val)
{
Reloc *p, *p1;
p = (Reloc *)s->c;
while (p != NULL) {
p1 = p->next;
switch(p->type) {
case RELOC_ADDR32:
*(int *)p->addr = val;
break;
case RELOC_REL32:
*(int *)p->addr = val - p->addr - 4;
break;
}
free(p);
p = p1;
}
s->c = val;
}
/* output a symbol and patch all calls to it */
void gsym_addr(t, a)
{
int n;
while (t) {
n = *(int *)t; /* next value */
*(int *)t = a - t - 4;
t = n;
}
}
void gsym(t)
{
gsym_addr(t, ind);
}
/* psym is used to put an instruction with a data field which is a
reference to a symbol. It is in fact the same as oad ! */
#define psym oad
/* instruction + 4 bytes data. Return the address of the data */
int oad(int c, int s)
{
o(c);
*(int *)ind = s;
s = ind;
ind = ind + 4;
return s;
}
/* output constant with relocation if 't & VT_FORWARD' is true */
void gen_addr32(int c, int t)
{
if (!(t & VT_FORWARD)) {
gen_le32(c);
} else {
greloc((Sym *)c, ind, RELOC_ADDR32);
gen_le32(0);
}
}
/* XXX: generate correct pointer for forward references to functions */
/* r = (ft, fc) */
void load(r, ft, fc)
{
int v, t;
v = ft & VT_VALMASK;
if (ft & VT_LVAL) {
if (v == VT_LLOCAL) {
load(r, VT_LOCAL | VT_LVAL, fc);
v = r;
}
if ((ft & VT_TYPE) == VT_BYTE)
o(0xbe0f); /* movsbl */
else if ((ft & VT_TYPE) == (VT_BYTE | VT_UNSIGNED))
o(0xb60f); /* movzbl */
else if ((ft & VT_TYPE) == VT_SHORT)
o(0xbf0f); /* movswl */
else if ((ft & VT_TYPE) == (VT_SHORT | VT_UNSIGNED))
o(0xb70f); /* movzwl */
else
o(0x8b); /* movl */
if (v == VT_CONST) {
o(0x05 + r * 8); /* 0xXX, r */
gen_addr32(fc, ft);
} else if (v == VT_LOCAL) {
oad(0x85 + r * 8, fc); /* xx(%ebp), r */
} else {
g(0x00 + r * 8 + v); /* (v), r */
}
} else {
if (v == VT_CONST) {
o(0xb8 + r); /* mov $xx, r */
gen_addr32(fc, ft);
} else if (v == VT_LOCAL) {
o(0x8d);
oad(0x85 + r * 8, fc); /* lea xxx(%ebp), r */
} else if (v == VT_CMP) {
oad(0xb8 + r, 0); /* mov $0, r */
o(0x0f); /* setxx %br */
o(fc);
o(0xc0 + r);
} else if (v == VT_JMP || v == VT_JMPI) {
t = v & 1;
oad(0xb8 + r, t); /* mov $1, r */
oad(0xe9, 5); /* jmp after */
gsym(fc);
oad(0xb8 + r, t ^ 1); /* mov $0, r */
} else if (v != r) {
o(0x89);
o(0xc0 + r + v * 8); /* mov v, r */
}
}
}
/* (ft, fc) = r */
/* WARNING: r must not be allocated on the stack */
void store(r, ft, fc)
{
int fr, b;
fr = ft & VT_VALMASK;
b = (ft & VT_TYPE) == VT_BYTE;
/* XXX: incorrect if reg to reg */
if (ft & VT_SHORT)
o(0x66);
o(0x89 - b);
if (fr == VT_CONST) {
o(0x05 + r * 8); /* mov r,xxx */
gen_addr32(fc, ft);
} else if (fr == VT_LOCAL) {
oad(0x85 + r * 8, fc); /* mov r,xxx(%ebp) */
} else if (ft & VT_LVAL) {
g(fr + r * 8); /* mov r, (fr) */
} else if (fr != r) {
o(0xc0 + fr + r * 8); /* mov r, fr */
}
}
/* start function call and return function call context */
void gfunc_start(GFuncContext *c)
{
c->args_size = 0;
}
/* push function parameter which is in (vt, vc) */
void gfunc_param(GFuncContext *c)
{
int size, align, ft, fc, r;
if ((vt & (VT_STRUCT | VT_LVAL)) == (VT_STRUCT | VT_LVAL)) {
size = type_size(vt, &align);
/* align to stack align size */
size = (size + 3) & ~3;
/* allocate the necessary size on stack */
oad(0xec81, size); /* sub $xxx, %esp */
/* generate structure store */
r = get_reg();
o(0x89); /* mov %esp, r */
o(0xe0 + r);
ft = vt;
fc = vc;
vset(VT_INT | r, 0);
vpush();
vt = ft;
vc = fc;
vstore();
c->args_size += size;
} else {
/* simple type (currently always same size) */
/* XXX: implicit cast ? */
r = gv();
o(0x50 + r); /* push r */
c->args_size += 4;
}
}
/* generate function call with address in (ft, fc) and free function */
void gfunc_call(GFuncContext *c, int ft, int fc)
{
int r;
r = ft & VT_VALMASK;
if (r == VT_CONST) {
/* forward reference */
if (ft & VT_FORWARD) {
greloc((Sym *)fc, ind + 1, RELOC_REL32);
oad(0xe8, 0);
} else {
oad(0xe8, fc - ind - 5);
}
} else if (r == VT_LOCAL) {
oad(0x95ff, fc); /* call *xxx(%ebp) */
} else {
/* not actually used */
o(0xff); /* call *r */
o(0xd0 + r);
}
if (c->args_size)
oad(0xc481, c->args_size); /* add $xxx, %esp */
}
int gjmp(int t)
{
return psym(0xe9, t);
}
/* generate a test. set 'inv' to invert test */
int gtst(inv, t)
{
int v, *p;
v = vt & VT_VALMASK;
if (v == VT_CMP) {
/* fast case : can jump directly since flags are set */
g(0x0f);
t = psym((vc - 16) ^ inv, t);
} else if (v == VT_JMP || v == VT_JMPI) {
/* && or || optimization */
if ((v & 1) == inv) {
/* insert vc jump list in t */
p = &vc;
while (*p != 0)
p = (int *)*p;
*p = t;
t = vc;
} else {
t = gjmp(t);
gsym(vc);
}
} else if ((vt & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
/* constant jmp optimization */
if ((vc != 0) != inv)
t = gjmp(t);
} else {
v = gv();
o(0x85);
o(0xc0 + v * 9);
g(0x0f);
t = psym(0x85 ^ inv, t);
}
return t;
}
/* generate a binary operation 'v = r op fr' instruction and modifies
(vt,vc) if needed */
void gen_op1(op, r, fr)
{
int t;
if (op == '+') {
o(0x01);
o(0xc0 + r + fr * 8);
} else if (op == '-') {
o(0x29);
o(0xc0 + r + fr * 8);
} else if (op == '&') {
o(0x21);
o(0xc0 + r + fr * 8);
} else if (op == '^') {
o(0x31);
o(0xc0 + r + fr * 8);
} else if (op == '|') {
o(0x09);
o(0xc0 + r + fr * 8);
} else if (op == '*') {
o(0xaf0f); /* imul fr, r */
o(0xc0 + fr + r * 8);
} else if (op == TOK_SHL | op == TOK_SHR | op == TOK_SAR) {
/* op2 is %ecx */
if (fr != 1) {
if (r == 1) {
r = fr;
fr = 1;
o(0x87); /* xchg r, %ecx */
o(0xc1 + r * 8);
} else
move_reg(1, fr);
}
o(0xd3); /* shl/shr/sar %cl, r */
if (op == TOK_SHL)
o(0xe0 + r);
else if (op == TOK_SHR)
o(0xe8 + r);
else
o(0xf8 + r);
vt = (vt & VT_TYPE) | r;
} else if (op == '/' | op == TOK_UDIV | op == TOK_PDIV |
op == '%' | op == TOK_UMOD) {
save_reg(2); /* save edx */
t = save_reg_forced(fr); /* save fr and get op2 location */
move_reg(0, r); /* op1 is %eax */
if (op == TOK_UDIV | op == TOK_UMOD) {
o(0xf7d231); /* xor %edx, %edx, div t(%ebp), %eax */
oad(0xb5, t);
} else {
o(0xf799); /* cltd, idiv t(%ebp), %eax */
oad(0xbd, t);
}
if (op == '%' | op == TOK_UMOD)
r = 2;
else
r = 0;
vt = (vt & VT_TYPE) | r;
} else {
o(0x39);
o(0xc0 + r + fr * 8); /* cmp fr, r */
vset(VT_CMP, op);
}
}
/* end of X86 code generator */
/*************************************************************/
int save_reg_forced(int r)
{
int i, l, *p, t;
/* store register */
loc = (loc - 4) & -3;
store(r, VT_LOCAL, loc);
l = loc;
/* modify all stack values */
for(p=vstack;p<vstack_ptr;p+=2) {
i = p[0] & VT_VALMASK;
if (i == r) {
if (p[0] & VT_LVAL)
t = VT_LLOCAL;
else
t = VT_LOCAL;
p[0] = (p[0] & VT_TYPE) | VT_LVAL | t;
p[1] = l;
}
}
return l;
}
/* save r to memory. and mark it as being free */
void save_reg(r)
{
int i, *p;
/* modify all stack values */
for(p=vstack;p<vstack_ptr;p+=2) {
i = p[0] & VT_VALMASK;
if (i == r) {
save_reg_forced(r);
break;
}
}
}
/* find a free register. If none, save one register */
int get_reg(void)
{
int r, i, *p;
/* find a free register */
for(r=0;r<NB_REGS;r++) {
for(p=vstack;p<vstack_ptr;p+=2) {
i = p[0] & VT_VALMASK;
if (i == r)
goto notfound;
}
return r;
notfound: ;
}
/* no register left : free the first one on the stack (very
important to start from the bottom to ensure that we don't
spill registers used in gen_op()) */
for(p=vstack;p<vstack_ptr;p+=2) {
r = p[0] & VT_VALMASK;
if (r < VT_CONST) {
save_reg(r);
break;
}
}
return r;
}
void save_regs()
{
int r, *p;
for(p=vstack;p<vstack_ptr;p+=2) {
r = p[0] & VT_VALMASK;
if (r < VT_CONST) {
save_reg(r);
}
}
}
/* move register 's' to 'r', and flush previous value of r to memory
if needed */
void move_reg(r, s)
{
if (r != s) {
save_reg(r);
load(r, s, 0);
}
}
/* convert a stack entry in register. lvalues are converted as
values. Cannot be used if cannot be converted to register value
(such as structures). */
int gvp(int *p)
{
int r;
r = p[0] & VT_VALMASK;
if (r >= VT_CONST || (p[0] & VT_LVAL))
r = get_reg();
/* NOTE: get_reg can modify p[] */
load(r, p[0], p[1]);
p[0] = (p[0] & VT_TYPE) | r;
return r;
}
void vpush(void)
{
if (vstack_ptr >= vstack + VSTACK_SIZE)
error("memory full");
*vstack_ptr++ = vt;
*vstack_ptr++ = vc;
/* cannot let cpu flags if other instruction are generated */
if ((vt & VT_VALMASK) == VT_CMP)
gvp(vstack_ptr - 2);
}
void vpop(int *ft, int *fc)
{
*fc = *--vstack_ptr;
*ft = *--vstack_ptr;
}
/* generate a value in a register from vt and vc */
int gv(void)
{
int r;
vpush();
r = gvp(vstack_ptr - 2);
vpop(&vt, &vc);
return r;
}
/* handle constant optimizations and various machine independant opt */
void gen_opc(op)
{
int fr, ft, fc, r, c1, c2, n;
vpop(&ft, &fc);
vpop(&vt, &vc);
c1 = (vt & (VT_VALMASK | VT_LVAL)) == VT_CONST;
c2 = (ft & (VT_VALMASK | VT_LVAL)) == VT_CONST;
if (c1 && c2) {
switch(op) {
case '+': vc += fc; break;
case '-': vc -= fc; break;
case '&': vc &= fc; break;
case '^': vc ^= fc; break;
case '|': vc |= fc; break;
case '*': vc *= fc; break;
case TOK_PDIV:
case '/': vc /= fc; break; /* XXX: zero case ? */
case '%': vc %= fc; break; /* XXX: zero case ? */
case TOK_UDIV: vc = (unsigned)vc / fc; break; /* XXX: zero case ? */
case TOK_UMOD: vc = (unsigned)vc % fc; break; /* XXX: zero case ? */
case TOK_SHL: vc <<= fc; break;
case TOK_SHR: vc = (unsigned)vc >> fc; break;
case TOK_SAR: vc >>= fc; break;
/* tests */
case TOK_ULT: vc = (unsigned)vc < (unsigned)fc; break;
case TOK_UGE: vc = (unsigned)vc >= (unsigned)fc; break;
case TOK_EQ: vc = vc == fc; break;
case TOK_NE: vc = vc != fc; break;
case TOK_ULE: vc = (unsigned)vc <= (unsigned)fc; break;
case TOK_UGT: vc = (unsigned)vc > (unsigned)fc; break;
case TOK_LT: vc = vc < fc; break;
case TOK_GE: vc = vc >= fc; break;
case TOK_LE: vc = vc <= fc; break;
case TOK_GT: vc = vc > fc; break;
/* logical */
case TOK_LAND: vc = vc && fc; break;
case TOK_LOR: vc = vc || fc; break;
default:
goto general_case;
}
} else {
/* if commutative ops, put c2 as constant */
if (c1 && (op == '+' || op == '&' || op == '^' ||
op == '|' || op == '*')) {
swap(&vt, &ft);
swap(&vc, &fc);
swap(&c1, &c2);
}
if (c2 && (((op == '*' || op == '/' || op == TOK_UDIV ||
op == TOK_PDIV) &&
fc == 1) ||
((op == '+' || op == '-' || op == '|' || op == '^' ||
op == TOK_SHL || op == TOK_SHR || op == TOK_SAR) &&
fc == 0) ||
(op == '&' &&
fc == -1))) {
} else if (c2 && (op == '*' || op == TOK_PDIV || op == TOK_UDIV)) {
/* try to use shifts instead of muls or divs */
if (fc > 0 && (fc & (fc - 1)) == 0) {
n = -1;
while (fc) {
fc >>= 1;
n++;
}
fc = n;
if (op == '*')
op = TOK_SHL;
else if (op == TOK_PDIV)
op = TOK_SAR;
else
op = TOK_SHR;
}
goto general_case;
} else {
general_case:
vpush();
vt = ft;
vc = fc;
vpush();
r = gvp(vstack_ptr - 4);
fr = gvp(vstack_ptr - 2);
vpop(&ft, &fc);
vpop(&vt, &vc);
/* call low level op generator */
gen_op1(op, r, fr);
}
}
}
int pointed_size(int t)
{
return type_size(pointed_type(t), &t);
}
/* generic gen_op: handles types problems */
void gen_op(int op)
{
int u, t1, t2;
vpush();
t1 = vstack_ptr[-4];
t2 = vstack_ptr[-2];
if (op == '+' | op == '-') {
if ((t1 & VT_PTR) && (t2 & VT_PTR)) {
if (op != '-')
error("invalid type");
/* XXX: check that types are compatible */
u = pointed_size(t1);
gen_opc(op);
vpush();
vstack_ptr[-2] &= ~VT_TYPE; /* set to integer */
vset(VT_CONST, u);
gen_op(TOK_PDIV);
} else if ((t1 | t2) & VT_PTR) {
if (t2 & VT_PTR) {
swap(vstack_ptr - 4, vstack_ptr - 2);
swap(vstack_ptr - 3, vstack_ptr - 1);
swap(&t1, &t2);
}
/* stack-4 contains pointer, stack-2 value to add */
vset(VT_CONST, pointed_size(vstack_ptr[-4]));
gen_op('*');
vpush();
gen_opc(op);
/* put again type if gen_opc() swaped operands */
vt = (vt & VT_TYPEN) | (t1 & VT_TYPE);
} else {
gen_opc(op);
}
} else {
/* XXX: test types and compute returned value */
if ((t1 | t2) & (VT_UNSIGNED | VT_PTR)) {
if (op == TOK_SAR)
op = TOK_SHR;
else if (op == '/')
op = TOK_UDIV;
else if (op == '%')
op = TOK_UMOD;
else if (op == TOK_LT)
op = TOK_ULT;
else if (op == TOK_GT)
op = TOK_UGT;
else if (op == TOK_LE)
op = TOK_ULE;
else if (op == TOK_GE)
op = TOK_UGE;
}
gen_opc(op);
}
}
/* cast (vt, vc) to 't' type */
void gen_cast(int t)
{
int r, bits;
r = vt & VT_VALMASK;
if (!(t & VT_LVAL)) {
/* if not lvalue, then we convert now */
if ((t & VT_TYPE & ~VT_UNSIGNED) == VT_BYTE)
bits = 8;
else if ((t & VT_TYPE & ~VT_UNSIGNED) == VT_SHORT)
bits = 16;
else
goto the_end;
vpush();
if (t & VT_UNSIGNED) {
vset(VT_CONST, (1 << bits) - 1);
gen_op('&');
} else {
bits = 32 - bits;
vset(VT_CONST, bits);
gen_op(TOK_SHL);
vpush();
vset(VT_CONST, bits);
gen_op(TOK_SAR);
}
}
the_end:
vt = (vt & VT_TYPEN) | t;
}
/* return type size. Put alignment at 'a' */
int type_size(int t, int *a)
{
Sym *s;
/* int, enum or pointer */
if (t & VT_STRUCT) {
/* struct/union */
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT) | SYM_STRUCT);
*a = 4; /* XXX: cannot store it yet. Doing that is safe */
return s->c;
} else if (t & VT_ARRAY) {
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT));
return type_size(s->t, a) * s->c;
} else if ((t & VT_PTR) |
(t & VT_TYPE) == 0 |
(t & VT_ENUM)) {
*a = 4;
return 4;
} else if (t & VT_SHORT) {
*a = 2;
return 2;
} else {
*a = 1;
return 1;
}
}
/* return the pointed type of t */
int pointed_type(int t)
{
Sym *s;
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT));
return s->t | (t & VT_TYPEN);
}
int mk_pointer(int t)
{
int p;
p = anon_sym++;
sym_push(p, t, -1);
return VT_PTR | (p << VT_STRUCT_SHIFT) | (t & VT_TYPEN);
}
/* store value in lvalue pushed on stack */
void vstore(void)
{
int ft, fc, r, t, size, align;
GFuncContext gf;
if (vt & VT_STRUCT) {
/* if structure, only generate pointer */
/* structure assignment : generate memcpy */
/* XXX: optimize if small size */
gfunc_start(&gf);
/* type size */
ft = vt;
fc = vc;
size = type_size(vt, &align);
vset(VT_CONST, size);
gfunc_param(&gf);
/* source */
vt = ft & ~VT_LVAL;
vc = fc;
gfunc_param(&gf);
/* destination */
vpop(&vt, &vc);
vt &= ~VT_LVAL;
gfunc_param(&gf);
save_regs();
gfunc_call(&gf, VT_CONST, (int)&memcpy);
/* generate again current type */
vt = ft;
vc = fc;
} else {
r = gv(); /* generate value */
vpush();
ft = vstack_ptr[-4];
fc = vstack_ptr[-3];
/* if lvalue was saved on stack, must read it */
if ((ft & VT_VALMASK) == VT_LLOCAL) {
t = get_reg();
load(t, VT_LOCAL | VT_LVAL, fc);
ft = (ft & ~VT_VALMASK) | t;
}
store(r, ft, fc);
vstack_ptr -= 4;
}
}
/* post defines POST/PRE add. c is the token ++ or -- */
void inc(post, c)
{
int r, r1;
test_lvalue();
if (post)
vpush(); /* room for returned value */
vpush(); /* save lvalue */
r = gv();
vpush(); /* save value */
if (post) {
/* duplicate value */
r1 = get_reg();
load(r1, r, 0); /* move r to r1 */
vstack_ptr[-6] = (vt & VT_TYPE) | r1;
vstack_ptr[-5] = 0;
}
/* add constant */
vset(VT_CONST, c - TOK_MID);
gen_op('+');
vstore(); /* store value */
if (post)
vpop(&vt, &vc);
}
/* enum/struct/union declaration */
int struct_decl(int u)
{
int a, t, b, v, size, align, maxalign, c;
Sym *s, *ss, **ps;
a = tok; /* save decl type */
next();
if (tok != '{') {
v = tok;
next();
/* struct already defined ? return it */
/* XXX: check consistency */
if (s = sym_find(v | SYM_STRUCT)) {
if (s->t != a)
error("invalid type");
goto do_decl;
}
} else {
v = anon_sym++;
}
s = sym_push(v | SYM_STRUCT, a, 0);
/* put struct/union/enum name in type */
do_decl:
u = u | (v << VT_STRUCT_SHIFT);
if (tok == '{') {
next();
if (s->c)
error("struct/union/enum already defined");
/* cannot be empty */
c = 0;
maxalign = 0;
ps = &s->next;
while (1) {
if (a == TOK_ENUM) {
v = tok;
next();
if (tok == '=') {
next();
c = expr_const();
}
sym_push(v, VT_CONST, c);
if (tok == ',')
next();
c++;
} else {
b = ist();
while (1) {
t = type_decl(&v, b, TYPE_DIRECT);
if (t & (VT_FUNC | VT_TYPEDEF))
error("invalid type");
/* XXX: align & correct type size */
v |= SYM_FIELD;
size = type_size(t, &align);
if (a == TOK_STRUCT) {
c = (c + align - 1) & -align;
ss = sym_push(v, t, c);
c += size;
} else {
ss = sym_push(v, t, 0);
if (size > c)
c = size;
}
if (align > maxalign)
maxalign = align;
*ps = ss;
ps = &ss->next;
if (tok == ';' || tok == -1)
break;
skip(',');
}
skip(';');
}
if (tok == '}')
break;
}
skip('}');
/* size for struct/union, dummy for enum */
s->c = (c + maxalign - 1) & -maxalign;
}
return u;
}
/* return 0 if no type declaration. otherwise, return the basic type
and skip it.
XXX: A '2' is ored to ensure non zero return if int type.
*/
int ist(void)
{
int t;
Sym *s;
t = 0;
while(1) {
if (tok == TOK_ENUM) {
t |= struct_decl(VT_ENUM);
} else if (tok == TOK_STRUCT || tok == TOK_UNION) {
t |= struct_decl(VT_STRUCT);
} else {
if (tok == TOK_CHAR) {
t |= VT_BYTE;
} else if (tok == TOK_VOID) {
t |= VT_VOID;
} else if (tok == TOK_SHORT) {
t |= VT_SHORT;
} else if (tok == TOK_INT |
(tok >= TOK_CONST & tok <= TOK_INLINE)) {
/* ignored types */
} else if (tok == TOK_FLOAT || tok == TOK_DOUBLE) {
/* We allow that to compile standard headers */
// warning("floats not supported");
} else if (tok == TOK_EXTERN) {
t |= VT_EXTERN;
} else if (tok == TOK_STATIC) {
t |= VT_STATIC;
} else if (tok == TOK_UNSIGNED) {
t |= VT_UNSIGNED;
} else if (tok == TOK_TYPEDEF) {
t |= VT_TYPEDEF;
} else {
s = sym_find(tok);
if (!s || !(s->t & VT_TYPEDEF))
break;
t |= (s->t & ~VT_TYPEDEF);
}
next();
}
t |= 2;
}
return t;
}
int post_type(t)
{
int p, n, pt, l;
Sym **plast, *s, *first;
if (tok == '(') {
/* function declaration */
next();
l = 0;
first = NULL;
plast = &first;
while (tok != ')') {
/* read param name and compute offset */
if (l != FUNC_OLD) {
if (!(pt = ist())) {
if (l) {
error("invalid type");
} else {
l = FUNC_OLD;
goto old_proto;
}
}
if (pt & VT_VOID && tok == ')')
break;
l = FUNC_NEW;
pt = type_decl(&n, pt, TYPE_DIRECT | TYPE_ABSTRACT);
} else {
old_proto:
n = tok;
pt = VT_INT;
next();
}
/* array must be transformed to pointer according to ANSI C */
pt &= ~VT_ARRAY;
s = sym_push(n | SYM_FIELD, pt, 0);
*plast = s;
plast = &s->next;
if (tok == ',') {
next();
if (l == FUNC_NEW && tok == TOK_DOTS) {
l = FUNC_ELLIPSIS;
next();
break;
}
}
}
skip(')');
t = post_type(t);
/* we push a anonymous symbol which will contain the function prototype */
p = anon_sym++;
s = sym_push(p, t, l);
s->next = first;
t = VT_FUNC | (p << VT_STRUCT_SHIFT);
} else if (tok == '[') {
/* array definition */
next();
n = -1;
if (tok != ']') {
n = expr_const();
if (n < 0)
error("invalid array size");
}
skip(']');
/* parse next post type */
t = post_type(t);
/* we push a anonymous symbol which will contain the array
element type */
p = anon_sym++;
sym_push(p, t, n);
t = VT_ARRAY | VT_PTR | (p << VT_STRUCT_SHIFT);
}
return t;
}
/* Read a type declaration (except basic type), and return the
type. If v is true, then also put variable name in 'vc' */
int type_decl(int *v, int t, int td)
{
int u, p;
Sym *s;
t = t & -3; /* suppress the ored '2' */
while (tok == '*') {
next();
while (tok == TOK_CONST || tok == TOK_VOLATILE || tok == TOK_RESTRICT)
next();
t = mk_pointer(t);
}
/* recursive type */
/* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
if (tok == '(') {
next();
u = type_decl(v, 0, td);
skip(')');
} else {
u = 0;
/* type identifier */
if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
*v = tok;
next();
} else {
if (!(td & TYPE_ABSTRACT))
expect("identifier");
*v = 0;
}
}
/* append t at the end of u */
t = post_type(t);
if (!u)
return t;
p = u;
while(1) {
s = sym_find((unsigned)p >> VT_STRUCT_SHIFT);
p = s->t;
if (!p) {
s->t = t;
break;
}
}
return u;
}
/* define a new external reference to a function 'v' of type 'u' */
Sym *external_sym(int v, int u)
{
Sym *s;
s = sym_find(v);
if (!s) {
/* push forward reference */
s = sym_push1(&global_stack,
v, u | VT_CONST | VT_FORWARD, 0);
}
return s;
}
void indir(void)
{
if (vt & VT_LVAL)
gv();
if (!(vt & VT_PTR))
expect("pointer");
vt = pointed_type(vt);
if (!(vt & VT_ARRAY)) /* an array is never an lvalue */
vt |= VT_LVAL;
}
void unary(void)
{
int n, t, ft, fc, p, align, size;
Sym *s;
GFuncContext gf;
if (tok == TOK_NUM || tok == TOK_CCHAR || tok == TOK_LCHAR) {
vset(VT_CONST, tokc);
next();
} else if (tok == TOK___FUNC__) {
/* special function name identifier */
/* generate (char *) type */
vset(VT_CONST | mk_pointer(VT_BYTE), glo);
strcpy((void *)glo, funcname);
glo += strlen(funcname) + 1;
} else if (tok == TOK_LSTR) {
t = VT_INT;
goto str_init;
} else if (tok == TOK_STR) {
/* string parsing */
t = VT_BYTE;
str_init:
type_size(t, &align);
glo = (glo + align - 1) & -align;
fc = glo;
/* we must declare it as an array first to use initializer parser */
t = VT_CONST | VT_ARRAY | mk_pointer(t);
decl_initializer(t, glo, 1, 0);
glo += type_size(t, &align);
/* put it as pointer */
vset(t & ~VT_ARRAY, fc);
} else {
t = tok;
next();
if (t == '(') {
/* cast ? */
if (t = ist()) {
ft = type_decl(&n, t, TYPE_ABSTRACT);
skip(')');
/* check ISOC99 compound literal */
if (tok == '{') {
/* data is allocated locally by default */
if (global_expr)
ft |= VT_CONST;
else
ft |= VT_LOCAL;
/* all except arrays are lvalues */
if (!(ft & VT_ARRAY))
ft |= VT_LVAL;
fc = decl_initializer_alloc(ft, 1);
vset(ft, fc);
} else {
unary();
gen_cast(ft);
}
} else {
expr();
skip(')');
}
} else if (t == '*') {
unary();
indir();
} else if (t == '&') {
unary();
/* functions names must be treated as function pointers,
except for unary '&' and sizeof. Since we consider that
functions are not lvalues, we only have to handle it
there and in function calls. */
if (!(vt & VT_FUNC))
test_lvalue();
vt = mk_pointer(vt & VT_LVALN);
} else
if (t == '!') {
unary();
if ((vt & (VT_CONST | VT_LVAL)) == VT_CONST)
vc = !vc;
else if ((vt & VT_VALMASK) == VT_CMP)
vc = vc ^ 1;
else
vset(VT_JMP, gtst(1, 0));
} else
if (t == '~') {
unary();
vpush();
vset(VT_CONST, -1);
gen_op('^');
} else
if (t == '+') {
unary();
} else
if (t == TOK_SIZEOF) {
/* XXX: some code can be generated */
if (tok == '(') {
next();
if (t = ist())
vt = type_decl(&n, t, TYPE_ABSTRACT);
else
expr();
skip(')');
} else {
unary();
}
vset(VT_CONST, type_size(vt, &t));
} else
if (t == TOK_INC | t == TOK_DEC) {
unary();
inc(0, t);
} else if (t == '-') {
vset(VT_CONST, 0);
vpush();
unary();
gen_op('-');
} else
{
s = sym_find(t);
if (!s) {
if (tok != '(')
error("'%s' undeclared", get_tok_str(t, 0));
/* for simple function calls, we tolerate undeclared
external reference */
p = anon_sym++;
sym_push1(&global_stack, p, 0, FUNC_OLD);
/* int() function */
s = external_sym(t, VT_FUNC | (p << VT_STRUCT_SHIFT));
}
vset(s->t, s->c);
/* if forward reference, we must point to s */
if (vt & VT_FORWARD)
vc = (int)s;
}
}
/* post operations */
while (1) {
if (tok == TOK_INC | tok == TOK_DEC) {
inc(1, tok);
next();
} else if (tok == '.' | tok == TOK_ARROW) {
/* field */
if (tok == TOK_ARROW)
indir();
test_lvalue();
vt &= VT_LVALN;
next();
/* expect pointer on structure */
if (!(vt & VT_STRUCT))
expect("struct or union");
s = sym_find(((unsigned)vt >> VT_STRUCT_SHIFT) | SYM_STRUCT);
/* find field */
tok |= SYM_FIELD;
while (s = s->next) {
if (s->v == tok)
break;
}
if (!s)
error("field not found");
/* add field offset to pointer */
vt = vt & VT_TYPEN; /* change type to int */
vpush();
vset(VT_CONST, s->c);
gen_op('+');
/* change type to field type, and set to lvalue */
vt = (vt & VT_TYPEN) | s->t;
/* an array is never an lvalue */
if (!(vt & VT_ARRAY))
vt |= VT_LVAL;
next();
} else if (tok == '[') {
next();
vpush();
expr();
gen_op('+');
indir();
skip(']');
} else if (tok == '(') {
int rett, retc;
/* function call */
if (!(vt & VT_FUNC)) {
if ((vt & (VT_PTR | VT_ARRAY)) == VT_PTR) {
vt = pointed_type(vt);
if (!(vt & VT_FUNC))
goto error_func;
} else {
error_func:
expect("function type");
}
}
/* get return type */
s = sym_find((unsigned)vt >> VT_STRUCT_SHIFT);
vt &= ~VT_LVAL; /* no lvalue */
vpush(); /* push function address */
save_regs(); /* save used temporary registers */
gfunc_start(&gf);
next();
#ifdef INVERT_FUNC_PARAMS
{
int *str, len, parlevel, *saved_macro_ptr;
Sym *args, *s1;
/* read each argument and store it on a stack */
/* XXX: merge it with macro args ? */
args = NULL;
while (tok != ')') {
len = 0;
str = NULL;
parlevel = 0;
while ((parlevel > 0 || (tok != ')' && tok != ',')) &&
tok != -1) {
if (tok == '(')
parlevel++;
else if (tok == ')')
parlevel--;
tok_add2(&str, &len, tok, tokc);
next();
}
tok_add(&str, &len, -1); /* end of file added */
tok_add(&str, &len, 0);
sym_push2(&args, 0, 0, (int)str);
if (tok != ',')
break;
next();
}
if (tok != ')')
expect(")");
/* now generate code in reverse order by reading the stack */
saved_macro_ptr = macro_ptr;
while (args) {
macro_ptr = (int *)args->c;
next();
expr_eq();
gfunc_param(&gf);
s1 = args->prev;
free((int *)args->c);
free(args);
args = s1;
}
macro_ptr = saved_macro_ptr;
/* restore token */
tok = ')';
}
#endif
/* compute first implicit argument if a structure is returned */
if (s->t & VT_STRUCT) {
/* get some space for the returned structure */
size = type_size(s->t, &align);
loc = (loc - size) & -align;
rett = s->t | VT_LOCAL | VT_LVAL;
/* pass it as 'int' to avoid structure arg passing
problems */
vset(VT_INT | VT_LOCAL, loc);
retc = vc;
gfunc_param(&gf);
} else {
rett = s->t | FUNC_RET_REG; /* return in register */
retc = 0;
}
#ifndef INVERT_FUNC_PARAMS
while (tok != ')') {
expr_eq();
gfunc_param(&gf);
if (tok == ',')
next();
}
#endif
skip(')');
vpop(&ft, &fc);
gfunc_call(&gf, ft, fc);
/* return value */
vt = rett;
vc = retc;
} else {
break;
}
}
}
/* check if types are compatible for assignation */
int same_types(int t1, int t2)
{
t1 &= VT_TYPE;
t2 &= VT_TYPE;
if (t1 & VT_PTR) {
/* XXX: zero test ? */
if (!(t2 & VT_PTR))
return 0;
t1 = pointed_type(t1);
t2 = pointed_type(t2);
/* void matches everything */
if (t1 == VT_VOID || t2 == VT_VOID)
return 1;
return same_types(t1, t2);
} else if (t1 & VT_STRUCT) {
return (t2 == t1);
} else {
/* XXX: not complete */
return 1;
}
}
void uneq()
{
int t;
unary();
if (tok == '=' |
(tok >= TOK_A_MOD & tok <= TOK_A_DIV) |
tok == TOK_A_XOR | tok == TOK_A_OR |
tok == TOK_A_SHL | tok == TOK_A_SAR) {
test_lvalue();
vpush();
t = tok;
next();
if (t == '=') {
expr_eq();
if (!same_types(vt, vstack_ptr[-2]))
error("incompatible types");
} else {
vpush();
expr_eq();
gen_op(t & 0x7f);
}
vstore();
}
}
void sum(l)
{
int t;
if (l == 0)
uneq();
else {
sum(--l);
while ((l == 0 & (tok == '*' | tok == '/' | tok == '%')) |
(l == 1 & (tok == '+' | tok == '-')) |
(l == 2 & (tok == TOK_SHL | tok == TOK_SAR)) |
(l == 3 & ((tok >= TOK_ULE & tok <= TOK_GT) |
tok == TOK_ULT | tok == TOK_UGE)) |
(l == 4 & (tok == TOK_EQ | tok == TOK_NE)) |
(l == 5 & tok == '&') |
(l == 6 & tok == '^') |
(l == 7 & tok == '|') |
(l == 8 & tok == TOK_LAND) |
(l == 9 & tok == TOK_LOR)) {
vpush();
t = tok;
next();
sum(l);
gen_op(t);
}
}
}
/* only used if non constant */
void eand()
{
int t;
sum(8);
t = 0;
while (1) {
if (tok != TOK_LAND) {
if (t) {
t = gtst(1, t);
vset(VT_JMPI, t);
}
break;
}
t = gtst(1, t);
next();
sum(8);
}
}
void eor()
{
int t;
eand();
t = 0;
while (1) {
if (tok != TOK_LOR) {
if (t) {
t = gtst(0, t);
vset(VT_JMP, t);
}
break;
}
t = gtst(0, t);
next();
eand();
}
}
/* XXX: better constant handling */
void expr_eq()
{
int t, u, c, r1, r2;
if (const_wanted) {
sum(10);
if (tok == '?') {
c = vc;
next();
expr();
t = vc;
skip(':');
expr_eq();
if (c)
vc = t;
}
} else {
eor();
if (tok == '?') {
next();
t = gtst(1, 0);
expr();
r1 = gv();
skip(':');
u = gjmp(0);
gsym(t);
expr_eq();
r2 = gv();
move_reg(r1, r2);
vt = (vt & VT_TYPE) | r1;
gsym(u);
}
}
}
void expr()
{
while (1) {
expr_eq();
if (tok != ',')
break;
next();
}
}
int expr_const()
{
int a;
a = const_wanted;
const_wanted = 1;
expr_eq();
if ((vt & (VT_CONST | VT_LVAL)) != VT_CONST)
expect("constant");
const_wanted = a;
return vc;
}
void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg)
{
int a, b, c, d;
Sym *s;
if (tok == TOK_IF) {
/* if test */
next();
skip('(');
expr();
skip(')');
a = gtst(1, 0);
block(bsym, csym, case_sym, def_sym, case_reg);
c = tok;
if (c == TOK_ELSE) {
next();
d = gjmp(0);
gsym(a);
block(bsym, csym, case_sym, def_sym, case_reg);
gsym(d); /* patch else jmp */
} else
gsym(a);
} else if (tok == TOK_WHILE) {
next();
d = ind;
skip('(');
expr();
skip(')');
a = gtst(1, 0);
b = 0;
block(&a, &b, case_sym, def_sym, case_reg);
oad(0xe9, d - ind - 5); /* jmp */
gsym(a);
gsym_addr(b, d);
} else if (tok == '{') {
next();
/* declarations */
s = local_stack.top;
while (tok != '}') {
decl(VT_LOCAL);
if (tok != '}')
block(bsym, csym, case_sym, def_sym, case_reg);
}
/* pop locally defined symbols */
sym_pop(&local_stack, s);
next();
} else if (tok == TOK_RETURN) {
next();
if (tok != ';') {
if (func_vt & VT_STRUCT) {
/* if returning structure, must copy it to implicit
first pointer arg location */
vset(mk_pointer(func_vt) | VT_LOCAL | VT_LVAL, func_vc);
indir();
vpush();
}
expr();
if (func_vt & VT_STRUCT) {
/* copy structure value to pointer */
vstore();
} else {
/* move return value to standard return register */
move_reg(FUNC_RET_REG, gv());
}
}
skip(';');
rsym = gjmp(rsym); /* jmp */
} else if (tok == TOK_BREAK) {
/* compute jump */
if (!bsym)
error("cannot break");
*bsym = gjmp(*bsym);
next();
skip(';');
} else if (tok == TOK_CONTINUE) {
/* compute jump */
if (!csym)
error("cannot continue");
*csym = gjmp(*csym);
next();
skip(';');
} else if (tok == TOK_FOR) {
int e;
next();
skip('(');
if (tok != ';')
expr();
skip(';');
d = ind;
c = ind;
a = 0;
b = 0;
if (tok != ';') {
expr();
a = gtst(1, 0);
}
skip(';');
if (tok != ')') {
e = gjmp(0);
c = ind;
expr();
oad(0xe9, d - ind - 5); /* jmp */
gsym(e);
}
skip(')');
block(&a, &b, case_sym, def_sym, case_reg);
oad(0xe9, c - ind - 5); /* jmp */
gsym(a);
gsym_addr(b, c);
} else
if (tok == TOK_DO) {
next();
a = 0;
b = 0;
d = ind;
block(&a, &b, case_sym, def_sym, case_reg);
skip(TOK_WHILE);
skip('(');
gsym(b);
expr();
c = gtst(0, 0);
gsym_addr(c, d);
skip(')');
gsym(a);
skip(';');
} else
if (tok == TOK_SWITCH) {
next();
skip('(');
expr();
case_reg = gv();
skip(')');
a = 0;
b = 0;
c = 0;
block(&a, csym, &b, &c, case_reg);
/* if no default, jmp after switch */
if (c == 0)
c = ind;
/* default label */
gsym_addr(b, c);
/* break label */
gsym(a);
} else
if (tok == TOK_CASE) {
next();
a = expr_const();
if (!case_sym)
expect("switch");
gsym(*case_sym);
vset(case_reg, 0);
vpush();
vset(VT_CONST, a);
gen_op(TOK_EQ);
*case_sym = gtst(1, 0);
skip(':');
block(bsym, csym, case_sym, def_sym, case_reg);
} else
if (tok == TOK_DEFAULT) {
next();
skip(':');
if (!def_sym)
expect("switch");
if (*def_sym)
error("too many 'default'");
*def_sym = ind;
block(bsym, csym, case_sym, def_sym, case_reg);
} else
if (tok == TOK_GOTO) {
next();
s = sym_find1(&label_stack, tok);
/* put forward definition if needed */
if (!s)
s = sym_push1(&label_stack, tok, VT_FORWARD, 0);
/* label already defined */
if (s->t & VT_FORWARD)
s->c = gjmp(s->c); /* jmp xxx */
else
oad(0xe9, s->c - ind - 5); /* jmp xxx */
next();
skip(';');
} else {
b = tok;
next();
if (tok == ':') {
next();
/* label case */
s = sym_find1(&label_stack, b);
if (s) {
if (!(s->t & VT_FORWARD))
error("multiple defined label");
gsym(s->c);
s->c = ind;
s->t = 0;
} else {
sym_push1(&label_stack, b, 0, ind);
}
block(bsym, csym, case_sym, def_sym, case_reg);
} else {
/* expression case: go backward of one token */
/* XXX: currently incorrect if number/string/char */
tok1 = tok;
tok = b;
if (tok != ';') {
expr();
}
skip(';');
}
}
}
/* t is the array or struct type. c is the array or struct
address. cur_index/cur_field is the pointer to the current
value. 'size_only' is true if only size info is needed (only used
in arrays) */
void decl_designator(int t, int c,
int *cur_index, Sym **cur_field,
int size_only)
{
Sym *s, *f;
int notfirst, index, align;
notfirst = 0;
while (tok == '[' || tok == '.') {
if (tok == '[') {
if (!(t & VT_ARRAY))
expect("array type");
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT));
next();
index = expr_const();
if (index < 0 || (s->c >= 0 && index >= s->c))
expect("invalid index");
skip(']');
if (!notfirst)
*cur_index = index;
t = pointed_type(t);
c += index * type_size(t, &align);
} else {
if (!(t & VT_STRUCT))
expect("struct/union type");
next();
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT) | SYM_STRUCT);
tok |= SYM_FIELD;
f = s->next;
while (f) {
if (f->v == tok)
break;
f = f->next;
}
if (!f)
expect("field");
next();
if (!notfirst)
*cur_field = f;
t = f->t | (t & VT_TYPEN);
c += f->c;
}
notfirst = 1;
}
if (notfirst) {
skip('=');
} else {
if (t & VT_ARRAY) {
index = *cur_index;
t = pointed_type(t);
c += index * type_size(t, &align);
} else {
f = *cur_field;
if (!f)
error("too many field init");
t = f->t | (t & VT_TYPEN);
c += f->c;
}
}
decl_initializer(t, c, 0, size_only);
}
/* store a value or an expression directly in global data or in local array */
void init_putv(int t, int c, int v, int is_expr)
{
int saved_global_expr;
if ((t & VT_VALMASK) == VT_CONST) {
if (is_expr) {
/* compound literals must be allocated globally in this case */
saved_global_expr = global_expr;
global_expr = 1;
v = expr_const();
global_expr = saved_global_expr;
}
if (t & VT_BYTE)
*(char *)c = v;
else if (t & VT_SHORT)
*(short *)c = v;
else
*(int *)c = v;
} else {
vt = t;
vc = c;
vpush();
if (is_expr)
expr_eq();
else
vset(VT_CONST, v);
vstore();
}
}
/* put zeros for variable based init */
void init_putz(int t, int c, int size)
{
GFuncContext gf;
if ((t & VT_VALMASK) == VT_CONST) {
/* nothing to do because global are already set to zero */
} else {
gfunc_start(&gf);
vset(VT_CONST, size);
gfunc_param(&gf);
vset(VT_CONST, 0);
gfunc_param(&gf);
vset(VT_LOCAL, c);
gfunc_param(&gf);
gfunc_call(&gf, VT_CONST, (int)&memset);
}
}
/* 't' contains the type and storage info. c is the address of the
object. 'first' is true if array '{' must be read (multi dimension
implicit array init handling). 'size_only' is true if size only
evaluation is wanted (only for arrays). */
void decl_initializer(int t, int c, int first, int size_only)
{
int index, array_length, n, no_oblock, nb, parlevel, i;
int t1, size1, align1;
Sym *s, *f;
TokenSym *ts;
if (t & VT_ARRAY) {
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT));
n = s->c;
array_length = 0;
t1 = pointed_type(t);
size1 = type_size(t1, &align1);
no_oblock = 1;
if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
tok == '{') {
skip('{');
no_oblock = 0;
}
/* only parse strings here if correct type (otherwise: handle
them as ((w)char *) expressions */
if ((tok == TOK_LSTR &&
(t1 & VT_TYPE & ~VT_UNSIGNED) == VT_INT) ||
(tok == TOK_STR &&
(t1 & VT_TYPE & ~VT_UNSIGNED) == VT_BYTE)) {
/* XXX: move multiple string parsing in parser ? */
while (tok == TOK_STR || tok == TOK_LSTR) {
ts = (TokenSym *)tokc;
/* compute maximum number of chars wanted */
nb = ts->len;
if (n >= 0 && nb > (n - array_length))
nb = n - array_length;
if (!size_only) {
if (ts->len > nb)
warning("initializer-string for array is too long");
for(i=0;i<nb;i++) {
init_putv(t1, c + (array_length + i) * size1,
ts->str[i], 0);
}
}
array_length += nb;
next();
}
/* only add trailing zero if enough storage (no
warning in this case since it is standard) */
if (n < 0 || array_length < n) {
if (!size_only) {
init_putv(t1, c + (array_length * size1), 0, 0);
}
array_length++;
}
} else {
index = 0;
while (tok != '}') {
decl_designator(t, c, &index, NULL, size_only);
if (n >= 0 && index >= n)
error("index too large");
/* must put zero in holes (note that doing it that way
ensures that it even works with designators) */
if (!size_only && array_length < index) {
init_putz(t1, c + array_length * size1,
(index - array_length) * size1);
}
index++;
if (index > array_length)
array_length = index;
/* special test for multi dimensional arrays (may not
be strictly correct if designators are used at the
same time) */
if (index >= n && no_oblock)
break;
if (tok == '}')
break;
skip(',');
}
}
if (!no_oblock)
skip('}');
/* put zeros at the end */
if (!size_only && n >= 0 && array_length < n) {
init_putz(t1, c + array_length * size1,
(n - array_length) * size1);
}
/* patch type size if needed */
if (n < 0)
s->c = array_length;
} else if ((t & VT_STRUCT) && tok == '{') {
/* XXX: union needs only one init */
next();
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT) | SYM_STRUCT);
f = s->next;
array_length = 0;
index = 0;
n = s->c;
while (tok != '}') {
decl_designator(t, c, NULL, &f, size_only);
/* fill with zero between fields */
index = f->c;
if (!size_only && array_length < index) {
init_putz(t, c + array_length,
index - array_length);
}
index = index + type_size(f->t, &align1);
if (index > array_length)
array_length = index;
if (tok == '}')
break;
skip(',');
f = f->next;
}
/* put zeros at the end */
if (!size_only && array_length < n) {
init_putz(t, c + array_length,
n - array_length);
}
skip('}');
} else if (tok == '{') {
next();
decl_initializer(t, c, first, size_only);
skip('}');
} else if (size_only) {
/* just skip expression */
parlevel = 0;
while ((parlevel > 0 || (tok != '}' && tok != ',')) &&
tok != -1) {
if (tok == '(')
parlevel++;
else if (tok == ')')
parlevel--;
next();
}
} else {
init_putv(t, c, 0, 1);
}
}
/* parse an initializer for type 't' if 'has_init' is true, and
allocate space in local or global data space. The allocated address
in returned */
int decl_initializer_alloc(int t, int has_init)
{
int size, align, addr, tok1;
int *init_str, init_len, level, *saved_macro_ptr;
size = type_size(t, &align);
/* If unknown size, we must evaluate it before
evaluating initializers because
initializers can generate global data too
(e.g. string pointers or ISOC99 compound
literals). It also simplifies local
initializers handling */
init_len = 0;
init_str = NULL;
saved_macro_ptr = NULL; /* avoid warning */
tok1 = 0;
if (size < 0) {
if (!has_init)
error("unknown type size");
/* get all init string */
level = 0;
while (level > 0 || (tok != ',' && tok != ';')) {
if (tok < 0)
error("unexpect end of file in initializer");
tok_add2(&init_str, &init_len, tok, tokc);
if (tok == '{')
level++;
else if (tok == '}') {
if (level == 0)
break;
level--;
}
next();
}
tok1 = tok;
tok_add(&init_str, &init_len, -1);
tok_add(&init_str, &init_len, 0);
/* compute size */
saved_macro_ptr = macro_ptr;
macro_ptr = init_str;
next();
decl_initializer(t, 0, 1, 1);
/* prepare second initializer parsing */
macro_ptr = init_str;
next();
/* if still unknown size, error */
size = type_size(t, &align);
if (size < 0)
error("unknown type size");
}
if ((t & VT_VALMASK) == VT_LOCAL) {
loc = (loc - size) & -align;
addr = loc;
} else {
glo = (glo + align - 1) & -align;
addr = glo;
/* very important to increment global
pointer at this time because
initializers themselves can create new
initializers */
glo += size;
}
if (has_init) {
decl_initializer(t, addr, 1, 0);
/* restore parse state if needed */
if (init_str) {
free(init_str);
macro_ptr = saved_macro_ptr;
tok = tok1;
}
}
return addr;
}
/* 'l' is VT_LOCAL or VT_CONST to define default storage type */
void decl(int l)
{
int *a, t, b, v, u, addr, has_init, size, align;
Sym *sym;
while (1) {
b = ist();
if (!b) {
/* skip redundant ';' */
/* XXX: find more elegant solution */
if (tok == ';') {
next();
continue;
}
/* special test for old K&R protos without explicit int
type. Only accepted when defining global data */
if (l == VT_LOCAL || tok < TOK_DEFINE)
break;
b = VT_INT;
}
if ((b & (VT_ENUM | VT_STRUCT)) && tok == ';') {
/* we accept no variable after */
next();
continue;
}
while (1) { /* iterate thru each declaration */
t = type_decl(&v, b, TYPE_DIRECT);
if (tok == '{') {
if (l == VT_LOCAL)
error("cannot use local functions");
if (!(t & VT_FUNC))
expect("function definition");
/* patch forward references */
if ((sym = sym_find(v)) && (sym->t & VT_FORWARD)) {
greloc_patch(sym, ind);
sym->t = VT_CONST | t;
} else {
/* put function address */
sym_push1(&global_stack, v, VT_CONST | t, ind);
}
funcname = get_tok_str(v, 0);
/* push a dummy symbol to enable local sym storage */
sym_push1(&local_stack, 0, 0, 0);
/* define parameters */
sym = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
/* XXX: the following is x86 dependant -> move it to
x86 code gen */
addr = 8;
/* if the function returns a structure, then add an
implicit pointer parameter */
func_vt = sym->t;
if (func_vt & VT_STRUCT) {
func_vc = addr;
addr += 4;
}
while (sym = sym->next) {
u = sym->t;
sym_push(sym->v & ~SYM_FIELD,
u | VT_LOCAL | VT_LVAL,
addr);
if (u & VT_STRUCT) {
#ifdef FUNC_STRUCT_PARAM_AS_PTR
/* structs are passed as pointer */
size = 4;
#else
/* structs are directly put on stack (x86
like) */
size = type_size(u, &align);
size = (size + 3) & ~3;
#endif
} else {
/* XXX: size will be different someday */
size = 4;
}
addr += size;
}
loc = 0;
o(0xe58955); /* push %ebp, mov %esp, %ebp */
a = (int *)oad(0xec81, 0); /* sub $xxx, %esp */
rsym = 0;
block(0, 0, 0, 0, 0);
gsym(rsym);
o(0xc3c9); /* leave, ret */
*a = (-loc + 3) & -4; /* align local size to word &
save local variables */
sym_pop(&label_stack, 0); /* reset label stack */
sym_pop(&local_stack, 0); /* reset local stack */
funcname = ""; /* for safety */
func_vt = VT_VOID; /* for safety */
break;
} else {
if (b & VT_TYPEDEF) {
/* save typedefed type */
sym_push(v, t | VT_TYPEDEF, 0);
} else if (t & VT_FUNC) {
/* external function definition */
external_sym(v, t);
} else {
/* not lvalue if array */
if (!(t & VT_ARRAY))
t |= VT_LVAL;
if (b & VT_EXTERN) {
/* external variable */
external_sym(v, t);
} else {
u = l;
if (t & VT_STATIC)
u = VT_CONST;
u |= t;
has_init = (tok == '=');
if (has_init)
next();
addr = decl_initializer_alloc(u, has_init);
sym_push(v, u, addr);
}
}
if (tok != ',') {
skip(';');
break;
}
next();
}
}
}
}
/* open a dynamic library so that its symbol are available for
compiled programs */
void open_dll(char *libname)
{
char buf[1024];
void *h;
snprintf(buf, sizeof(buf), "lib%s.so", libname);
h = dlopen(buf, RTLD_GLOBAL | RTLD_LAZY);
if (!h)
error((char *)dlerror());
}
void reloc_external_syms(void)
{
Sym *s, *s1;
char *str;
int addr;
s = global_stack.top;
while (s != NULL) {
s1 = s->prev;
if (s->t & VT_FORWARD) {
/* if there is at least one relocation to do, then find it
and patch it */
if (s->c) {
str = get_tok_str(s->v, 0);
addr = (int)dlsym(NULL, str);
if (!addr)
error("unresolved external reference '%s'", str);
greloc_patch(s, addr);
}
}
s = s1;
}
}
/* output a binary file (for testing) */
void build_exe(char *filename)
{
FILE *f;
f = fopen(filename, "w");
fwrite((void *)prog, 1, ind - prog, f);
fclose(f);
}
int main(int argc, char **argv)
{
Sym *s;
int (*t)();
char *p, *r, *outfile;
int optind;
include_paths[0] = "/usr/include";
include_paths[1] = "/usr/lib/tcc";
include_paths[2] = "/usr/local/lib/tcc";
nb_include_paths = 3;
/* add all tokens */
tok_ident = TOK_IDENT;
p = "int\0void\0char\0if\0else\0while\0break\0return\0for\0extern\0static\0unsigned\0goto\0do\0continue\0switch\0case\0const\0volatile\0long\0register\0signed\0auto\0inline\0restrict\0float\0double\0short\0struct\0union\0typedef\0default\0enum\0sizeof\0define\0include\0ifdef\0ifndef\0elif\0endif\0defined\0undef\0error\0line\0__LINE__\0__FILE__\0__DATE__\0__TIME__\0__VA_ARGS__\0__func__\0main\0";
while (*p) {
r = p;
while (*r++);
tok_alloc(p, r - p - 1);
p = r;
}
/* standard defines */
define_symbol("__STDC__");
#ifdef __i386__
define_symbol("__i386__");
#endif
optind = 1;
outfile = NULL;
while (1) {
if (optind >= argc) {
show_help:
printf("tcc version 0.9.1 - Tiny C Compiler - Copyright (C) 2001 Fabrice Bellard\n"
"usage: tcc [-Idir] [-Dsym] [-llib] infile [infile_arg...]\n");
return 1;
}
r = argv[optind];
if (r[0] != '-')
break;
optind++;
if (r[1] == 'I') {
if (nb_include_paths >= INCLUDE_PATHS_MAX)
error("too many include paths");
include_paths[nb_include_paths++] = r + 2;
} else if (r[1] == 'D') {
define_symbol(r + 2);
} else if (r[1] == 'l') {
open_dll(r + 2);
} else if (r[1] == 'o') {
/* currently, only for testing, so not documented */
if (optind >= argc)
goto show_help;
outfile = argv[optind++];
} else {
fprintf(stderr, "invalid option -- '%s'\n", r);
exit(1);
}
}
filename = argv[optind];
line_num = 1;
funcname = "";
file = fopen(filename, "r");
if (!file) {
perror(filename);
exit(1);
}
include_stack_ptr = include_stack;
ifdef_stack_ptr = ifdef_stack;
glo = (int)malloc(DATA_SIZE);
memset((void *)glo, 0, DATA_SIZE);
prog = (int)malloc(TEXT_SIZE);
vstack_ptr = vstack;
anon_sym = 1 << (31 - VT_STRUCT_SHIFT);
ind = prog;
inp();
ch = '\n'; /* needed to parse correctly first preprocessor command */
next();
decl(VT_CONST);
if (tok != -1)
expect("declaration");
reloc_external_syms();
if (outfile) {
build_exe(outfile);
return 0;
} else {
s = sym_find(TOK_MAIN);
if (!s)
error("main() not defined");
t = (int (*)())s->c;
#ifdef PROFILE
return 1;
#else
return (*t)(argc - optind, argv + optind);
#endif
}
}
Reference in New Issue View Git Blame Copy Permalink