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5bf9559e9e
tinycc/tcc.c
bellard 5bf9559e9e bound check fix
2002-01-26 19:13:31 +00:00

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/*
* TCC - Tiny C Compiler
*
* Copyright (c) 2001, 2002 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 <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <unistd.h>
#include <signal.h>
#include <malloc.h>
#include <unistd.h>
#include <fcntl.h>
#ifndef WIN32
#include <sys/ucontext.h>
#include <sys/mman.h>
#endif
#include "elf.h"
#include "stab.h"
#ifndef CONFIG_TCC_STATIC
#include <dlfcn.h>
#endif
//#define DEBUG
/* preprocessor debug */
//#define PP_DEBUG
/* amount of virtual memory associated to a section (currently, we do
not realloc them) */
#define SECTION_VSIZE (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 2048 /* must be a power of two */
#define TOK_ALLOC_INCR 512 /* must be a power of two */
#define SYM_HASH_SIZE 1031
/* token symbol management */
typedef struct TokenSym {
struct TokenSym *hash_next;
int tok; /* token number */
int len;
char str[1];
} TokenSym;
/* constant value */
typedef union CValue {
long double ld;
double d;
float f;
int i;
unsigned int ui;
unsigned int ul; /* address (should be unsigned long on 64 bit cpu) */
long long ll;
unsigned long long ull;
struct TokenSym *ts;
struct Sym *sym;
int tab[1];
} CValue;
/* value on stack */
typedef struct SValue {
int t; /* type */
unsigned short r; /* register + flags */
unsigned short r2; /* second register, used for 'long long'
type. If not used, set to VT_CONST */
CValue c; /* constant */
} SValue;
/* symbol management */
typedef struct Sym {
int v; /* symbol token */
int t; /* associated type */
int r; /* associated register */
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 */
/* section definition */
typedef struct Section {
char name[64]; /* section name */
unsigned char *data; /* section data */
unsigned char *data_ptr; /* current data pointer */
int sh_num; /* elf section number */
int sh_type; /* elf section type */
int sh_flags; /* elf section flags */
int sh_entsize; /* elf entry size */
struct Section *link; /* link to another section */
struct Section *next;
} Section;
/* GNUC attribute definition */
typedef struct AttributeDef {
int aligned;
Section *section;
unsigned char func_call; /* FUNC_CDECL or FUNC_STDCALL */
} AttributeDef;
#define SYM_STRUCT 0x40000000 /* struct/union/enum symbol space */
#define SYM_FIELD 0x20000000 /* struct/union field symbol space */
#define SYM_FIRST_ANOM (1 << (31 - VT_STRUCT_SHIFT)) /* first anonymous sym */
/* stored in 'Sym.c' field */
#define FUNC_NEW 1 /* ansi function prototype */
#define FUNC_OLD 2 /* old function prototype */
#define FUNC_ELLIPSIS 3 /* ansi function prototype with ... */
/* stored in 'Sym.r' field */
#define FUNC_CDECL 0 /* standard c call */
#define FUNC_STDCALL 1 /* pascal c call */
/* 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 */
#define IO_BUF_SIZE 8192
typedef struct BufferedFile {
unsigned char *buf_ptr;
unsigned char *buf_end;
int fd;
int line_num; /* current line number - here to simply code */
char filename[1024]; /* current filename - here to simply code */
unsigned char buffer[IO_BUF_SIZE + 1]; /* extra size for CH_EOB char */
} BufferedFile;
#define CH_EOB 0 /* end of buffer or '\0' char in file */
#define CH_EOF (-1) /* end of file */
/* parser */
struct BufferedFile *file;
int ch, ch1, tok, tok1;
CValue tokc, tok1c;
/* sections */
Section *first_section;
int section_num;
Section *text_section, *data_section, *bss_section; /* predefined sections */
Section *cur_text_section; /* current section where function code is
generated */
/* bound check related sections */
Section *bounds_section; /* contains global data bound description */
Section *lbounds_section; /* contains local data bound description */
/* debug sections */
Section *stab_section, *stabstr_section, *symtab_section, *strtab_section;
/* loc : local variable index
ind : output code index
rsym: return symbol
anon_sym: anonymous symbol index
*/
int rsym, anon_sym,
prog, ind, loc, const_wanted;
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 last_line_num, last_ind, func_ind; /* debug last line number and pc */
int tok_ident;
TokenSym **table_ident;
TokenSym *hash_ident[TOK_HASH_SIZE];
char token_buf[STRING_MAX_SIZE + 1];
char *funcname;
/* contains global symbols which remain between each translation unit */
SymStack extern_stack;
SymStack define_stack, global_stack, local_stack, label_stack;
SValue vstack[VSTACK_SIZE], *vtop;
int *macro_ptr, *macro_ptr_allocated;
BufferedFile *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;
int char_pointer_type;
/* compile with debug symbol (and use them if error during execution) */
int do_debug = 0;
/* compile with built-in memory and bounds checker */
int do_bounds_check = 0;
/* display benchmark infos */
int do_bench = 0;
int total_lines;
int total_bytes;
/* use GNU C extensions */
int gnu_ext = 1;
/* use Tiny C extensions */
int tcc_ext = 1;
/* The current value can be: */
#define VT_VALMASK 0x00ff
#define VT_CONST 0x00f0 /* constant in vc
(must be first non register value) */
#define VT_LLOCAL 0x00f1 /* lvalue, offset on stack */
#define VT_LOCAL 0x00f2 /* offset on stack */
#define VT_CMP 0x00f3 /* the value is stored in processor flags (in vc) */
#define VT_JMP 0x00f4 /* value is the consequence of jmp true (even) */
#define VT_JMPI 0x00f5 /* value is the consequence of jmp false (odd) */
#define VT_LVAL 0x0100 /* var is an lvalue */
#define VT_FORWARD 0x0200 /* value is forward reference */
#define VT_MUSTCAST 0x0400 /* value must be casted to be correct (used for
char/short stored in integer registers) */
#define VT_MUSTBOUND 0x0800 /* bound checking must be done before
dereferencing value */
/* types */
#define VT_STRUCT_SHIFT 16 /* structure/enum name shift (16 bits left) */
#define VT_INT 0 /* integer type */
#define VT_BYTE 1 /* signed byte type */
#define VT_SHORT 2 /* short type */
#define VT_VOID 3 /* void type */
#define VT_PTR 4 /* pointer increment */
#define VT_ENUM 5 /* enum definition */
#define VT_FUNC 6 /* function type */
#define VT_STRUCT 7 /* struct/union definition */
#define VT_FLOAT 8 /* IEEE float */
#define VT_DOUBLE 9 /* IEEE double */
#define VT_LDOUBLE 10 /* IEEE long double */
#define VT_BOOL 11 /* ISOC99 boolean type */
#define VT_LLONG 12 /* 64 bit integer */
#define VT_LONG 13 /* long integer (NEVER USED as type, only
during parsing) */
#define VT_BTYPE 0x000f /* mask for basic type */
#define VT_UNSIGNED 0x0010 /* unsigned type */
#define VT_ARRAY 0x0020 /* array type (also has VT_PTR) */
#define VT_BITFIELD 0x0040 /* bitfield modifier */
/* storage */
#define VT_EXTERN 0x00000080 /* extern definition */
#define VT_STATIC 0x00000100 /* static variable */
#define VT_TYPEDEF 0x00000200 /* typedef definition */
/* type mask (except storage) */
#define VT_TYPE (~(VT_EXTERN | VT_STATIC | VT_TYPEDEF))
/* 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_UDIV 0xb0 /* unsigned division */
#define TOK_UMOD 0xb1 /* unsigned modulo */
#define TOK_PDIV 0xb2 /* fast division with undefined rounding for pointers */
#define TOK_CINT 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_CFLOAT 0xb9 /* float constant */
#define TOK_CDOUBLE 0xc0 /* double constant */
#define TOK_CLDOUBLE 0xc1 /* long double constant */
#define TOK_UMULL 0xc2 /* unsigned 32x32 -> 64 mul */
#define TOK_ADDC1 0xc3 /* add with carry generation */
#define TOK_ADDC2 0xc4 /* add with carry use */
#define TOK_SUBC1 0xc5 /* add with carry generation */
#define TOK_SUBC2 0xc6 /* add with carry use */
#define TOK_CUINT 0xc8 /* unsigned int constant */
#define TOK_CLLONG 0xc9 /* long long constant */
#define TOK_CULLONG 0xca /* unsigned long long constant */
#define TOK_ARROW 0xcb
#define TOK_DOTS 0xcc /* three dots */
#define TOK_SHR 0xcd /* unsigned shift right */
#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
#define TOK_EOF (-1) /* end of file */
/* 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___SIGNED__, /* gcc keyword */
TOK_AUTO,
TOK_INLINE,
TOK___INLINE__, /* gcc keyword */
TOK_RESTRICT,
/* unsupported type */
TOK_FLOAT,
TOK_DOUBLE,
TOK_BOOL,
TOK_SHORT,
TOK_STRUCT,
TOK_UNION,
TOK_TYPEDEF,
TOK_DEFAULT,
TOK_ENUM,
TOK_SIZEOF,
TOK___ATTRIBUTE__,
/* preprocessor only */
TOK_UIDENT, /* first "user" ident (not keyword) */
TOK_DEFINE = TOK_UIDENT,
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,
/* attribute identifiers */
TOK_SECTION,
TOK___SECTION__,
TOK_ALIGNED,
TOK___ALIGNED__,
TOK_UNUSED,
TOK___UNUSED__,
TOK_CDECL,
TOK___CDECL,
TOK___CDECL__,
TOK_STDCALL,
TOK___STDCALL,
TOK___STDCALL__,
TOK_NORETURN,
TOK___NORETURN__,
};
char *tcc_keywords =
"int\0void\0char\0if\0else\0while\0break\0return\0for\0extern\0static\0"
"unsigned\0goto\0do\0continue\0switch\0case\0const\0volatile\0long\0"
"register\0signed\0__signed__\0auto\0inline\0__inline__\0restrict\0"
"float\0double\0_Bool\0short\0struct\0union\0typedef\0default\0enum\0"
"sizeof\0__attribute__\0"
/* the following are not keywords. They are included to ease parsing */
"define\0include\0ifdef\0ifndef\0elif\0endif\0"
"defined\0undef\0error\0line\0"
"__LINE__\0__FILE__\0__DATE__\0__TIME__\0__VA_ARGS__\0"
"__func__\0main\0"
/* attributes */
"section\0__section__\0aligned\0__aligned__\0unused\0__unused__\0"
"cdecl\0__cdecl\0__cdecl__\0stdcall\0__stdcall\0__stdcall__\0"
"noreturn\0__noreturn__\0"
;
#ifdef WIN32
#define snprintf _snprintf
/* currently incorrect */
long double strtold(const char *nptr, char **endptr)
{
return (long double)strtod(nptr, endptr);
}
float strtof(const char *nptr, char **endptr)
{
return (float)strtod(nptr, endptr);
}
#else
/* XXX: need to define this to use them in non ISOC99 context */
extern float strtof (const char *__nptr, char **__endptr);
extern long double strtold (const char *__nptr, char **__endptr);
#endif
void sum(int l);
void next(void);
void next_nomacro(void);
int expr_const(void);
void expr_eq(void);
void gexpr(void);
void decl(int l);
void decl_initializer(int t, int r, int c, int first, int size_only);
int decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init);
int gv(int rc);
void gv2(int rc1, int rc2);
void move_reg(int r, int s);
void save_regs(void);
void save_reg(int r);
void vpop(void);
void vswap(void);
void vdup(void);
int get_reg(int rc);
void macro_subst(int **tok_str, int *tok_len,
Sym **nested_list, int *macro_str);
int save_reg_forced(int r);
void gen_op(int op);
void force_charshort_cast(int t);
void gen_cast(int t);
void vstore(void);
Sym *sym_find(int v);
Sym *sym_push(int v, int t, int r, int c);
/* type handling */
int type_size(int t, int *a);
int pointed_type(int t);
int pointed_size(int t);
int is_compatible_types(int t1, int t2);
int parse_btype(int *type_ptr, AttributeDef *ad);
int type_decl(AttributeDef *ad, int *v, int t, int td);
void error(const char *fmt, ...);
void rt_error(unsigned long pc, const char *fmt, ...);
void vpushi(int v);
void vset(int t, int r, int v);
void type_to_str(char *buf, int buf_size,
int t, const char *varstr);
/* section generation */
void greloc(Sym *s, int addr, int type);
static int put_elf_str(Section *s, const char *sym);
static void put_elf_sym(Section *s,
unsigned long value, unsigned long size,
int info, int other, int shndx, const char *name);
static void put_stabs(const char *str, int type, int other, int desc, int value);
static void put_stabn(int type, int other, int desc, int value);
static void put_stabd(int type, int other, int desc);
/* true if float/double/long double type */
static inline int is_float(int t)
{
int bt;
bt = t & VT_BTYPE;
return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT;
}
#include "bcheck.c"
#include "i386-gen.c"
#ifdef CONFIG_TCC_STATIC
#define RTLD_LAZY 0x001
#define RTLD_NOW 0x002
#define RTLD_GLOBAL 0x100
/* dummy function for profiling */
void *dlopen(const char *filename, int flag)
{
return NULL;
}
const char *dlerror(void)
{
return "error";
}
typedef struct TCCSyms {
char *str;
void *ptr;
} TCCSyms;
#define TCCSYM(a) { #a, &a, },
/* add the symbol you want here if no dynamic linking is done */
static TCCSyms tcc_syms[] = {
TCCSYM(printf)
TCCSYM(fprintf)
TCCSYM(fopen)
TCCSYM(fclose)
{ NULL, NULL },
};
void *dlsym(void *handle, const char *symbol)
{
TCCSyms *p;
p = tcc_syms;
while (p->str != NULL) {
if (!strcmp(p->str, symbol))
return p->ptr;
p++;
}
return NULL;
}
#endif
/********************************************************/
/* runtime library is there */
/* XXX: we suppose that the host compiler handles 'long long'. It
would not be difficult to suppress this assumption */
long long __divll(long long a, long long b)
{
return a / b;
}
long long __modll(long long a, long long b)
{
return a % b;
}
unsigned long long __divull(unsigned long long a, unsigned long long b)
{
return a / b;
}
unsigned long long __modull(unsigned long long a, unsigned long long b)
{
return a % b;
}
long long __sardi3(long long a, int b)
{
return a >> b;
}
unsigned long long __shrdi3(unsigned long long a, int b)
{
return a >> b;
}
long long __shldi3(long long a, int b)
{
return a << b;
}
float __ulltof(unsigned long long a)
{
return (float)a;
}
double __ulltod(unsigned long long a)
{
return (double)a;
}
long double __ulltold(unsigned long long a)
{
return (long double)a;
}
unsigned long long __ftoull(float a)
{
return (unsigned long long)a;
}
unsigned long long __dtoull(double a)
{
return (unsigned long long)a;
}
unsigned long long __ldtoull(long double a)
{
return (unsigned long long)a;
}
/********************************************************/
/* copy a string and truncate it. */
char *pstrcpy(char *buf, int buf_size, const char *s)
{
char *q, *q_end;
int c;
if (buf_size > 0) {
q = buf;
q_end = buf + buf_size - 1;
while (q < q_end) {
c = *s++;
if (c == '\0')
break;
*q++ = c;
}
*q = '\0';
}
return buf;
}
/* strcat and truncate. */
char *pstrcat(char *buf, int buf_size, const char *s)
{
int len;
len = strlen(buf);
if (len < buf_size)
pstrcpy(buf + len, buf_size - len, s);
return buf;
}
Section *new_section(const char *name, int sh_type, int sh_flags)
{
Section *sec, **psec;
void *data;
sec = malloc(sizeof(Section));
if (!sec)
error("memory full");
memset(sec, 0, sizeof(Section));
pstrcpy(sec->name, sizeof(sec->name), name);
sec->link = NULL;
sec->sh_num = ++section_num;
sec->sh_type = sh_type;
sec->sh_flags = sh_flags;
#ifdef WIN32
/* XXX: currently, a single malloc */
data = malloc(SECTION_VSIZE);
if (data == NULL)
error("could not alloc section '%s'", name);
#else
data = mmap(NULL, SECTION_VSIZE,
PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS,
-1, 0);
if (data == (void *)(-1))
error("could not mmap section '%s'", name);
#endif
sec->data = data;
sec->data_ptr = data;
psec = &first_section;
while (*psec != NULL)
psec = &(*psec)->next;
sec->next = NULL;
*psec = sec;
return sec;
}
/* return a reference to a section, and create it if it does not
exists */
Section *find_section(const char *name)
{
Section *sec;
for(sec = first_section; sec != NULL; sec = sec->next) {
if (!strcmp(name, sec->name))
return sec;
}
/* sections are created as PROGBITS */
return new_section(name, SHT_PROGBITS, SHF_ALLOC);
}
/* 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;
greloc_patch1(p, val);
free(p);
p = p1;
}
s->c = val;
s->r &= ~VT_FORWARD;
}
static inline int isid(int c)
{
return (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
c == '_';
}
static inline int isnum(int c)
{
return c >= '0' && c <= '9';
}
static inline int toup(int c)
{
if (ch >= 'a' && ch <= 'z')
return ch - 'a' + 'A';
else
return ch;
}
void printline(void)
{
BufferedFile **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: ", file->filename, file->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 *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
printline();
fprintf(stderr, "warning: ");
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
}
void skip(int c)
{
if (tok != c)
error("'%c' expected", c);
next();
}
void test_lvalue(void)
{
if (!(vtop->r & VT_LVAL))
expect("lvalue");
}
TokenSym *tok_alloc(const 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 * 263 + ((unsigned char *)str)[i]) & (TOK_HASH_SIZE - 1);
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);
}
if (tok_ident >= SYM_FIRST_ANOM)
error("memory full");
/* 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, CValue *cv)
{
static char buf[STRING_MAX_SIZE + 1];
TokenSym *ts;
char *p;
int i;
if (v == TOK_CINT || v == TOK_CUINT) {
sprintf(buf, "%u", cv->ui);
return buf;
} else if (v == TOK_CCHAR || v == TOK_LCHAR) {
p = buf;
*p++ = '\'';
add_char(&p, cv->i);
*p++ = '\'';
*p = '\0';
return buf;
} else if (v == TOK_STR || v == TOK_LSTR) {
ts = cv->ts;
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;
}
#define HASH_SYM(v) ((unsigned)(v) % SYM_HASH_SIZE)
/* 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[HASH_SYM(v)];
while (s) {
if (s->v == v)
return s;
s = s->hash_next;
}
return NULL;
}
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 */
if (v) {
ps = &st->hash[HASH_SYM(v)];
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 r, int c)
{
Sym *s;
if (local_stack.top)
s = sym_push1(&local_stack, v, t, c);
else
s = sym_push1(&global_stack, v, t, c);
s->r = r;
return s;
}
/* 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, except if symbol was freed (only
used for #undef symbols) */
if (s->v)
st->hash[HASH_SYM(s->v)] = s->hash_next;
free(s);
s = ss;
}
st->top = b;
}
/* undefined a hashed symbol (used for #undef). Its name is set to
zero */
void sym_undef(SymStack *st, Sym *s)
{
Sym **ss;
ss = &st->hash[HASH_SYM(s->v)];
while (*ss != NULL) {
if (*ss == s)
break;
ss = &(*ss)->hash_next;
}
*ss = s->hash_next;
s->v = 0;
}
/* I/O layer */
BufferedFile *tcc_open(const char *filename)
{
int fd;
BufferedFile *bf;
fd = open(filename, O_RDONLY);
if (fd < 0)
return NULL;
bf = malloc(sizeof(BufferedFile));
if (!bf) {
close(fd);
return NULL;
}
bf->fd = fd;
bf->buf_ptr = bf->buffer;
bf->buf_end = bf->buffer;
bf->buffer[0] = CH_EOB; /* put eob symbol */
pstrcpy(bf->filename, sizeof(bf->filename), filename);
bf->line_num = 1;
// printf("opening '%s'\n", filename);
return bf;
}
void tcc_close(BufferedFile *bf)
{
total_lines += bf->line_num;
close(bf->fd);
free(bf);
}
/* read one char. MUST call tcc_fillbuf if CH_EOB is read */
#define TCC_GETC(bf) (*(bf)->buf_ptr++)
/* fill input buffer and return next char */
int tcc_getc_slow(BufferedFile *bf)
{
int len;
/* only tries to read if really end of buffer */
if (bf->buf_ptr >= bf->buf_end) {
if (bf->fd != -1) {
len = read(bf->fd, bf->buffer, IO_BUF_SIZE);
if (len < 0)
len = 0;
} else {
len = 0;
}
total_bytes += len;
bf->buf_ptr = bf->buffer;
bf->buf_end = bf->buffer + len;
*bf->buf_end = CH_EOB;
}
if (bf->buf_ptr < bf->buf_end) {
return *bf->buf_ptr++;
} else {
bf->buf_ptr = bf->buf_end;
return CH_EOF;
}
}
/* no need to put that inline */
void handle_eob(void)
{
for(;;) {
ch1 = tcc_getc_slow(file);
if (ch1 != CH_EOF)
return;
if (include_stack_ptr == include_stack)
return;
/* add end of include file debug info */
if (do_debug) {
put_stabd(N_EINCL, 0, 0);
}
/* pop include stack */
tcc_close(file);
include_stack_ptr--;
file = *include_stack_ptr;
}
}
/* read next char from current input file */
static inline void inp(void)
{
ch1 = TCC_GETC(file);
/* end of buffer/file handling */
if (ch1 == CH_EOB)
handle_eob();
if (ch1 == '\n')
file->line_num++;
// printf("ch1=%c 0x%x\n", ch1, ch1);
}
/* input with '\\n' handling */
static inline void minp(void)
{
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(void)
{
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(void)
{
while (ch == ' ' || ch == '\t')
cinp();
}
/* skip block of text until #else, #elif or #endif. skip also pairs of
#if/#endif */
void preprocess_skip(void)
{
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--;
}
}
}
/* return the number of additionnal 'ints' necessary to store the
token */
static inline int tok_ext_size(int t)
{
switch(t) {
/* 4 bytes */
case TOK_CINT:
case TOK_CUINT:
case TOK_CCHAR:
case TOK_LCHAR:
case TOK_STR:
case TOK_LSTR:
case TOK_CFLOAT:
return 1;
case TOK_CDOUBLE:
case TOK_CLLONG:
case TOK_CULLONG:
return 2;
case TOK_CLDOUBLE:
return LDOUBLE_SIZE / 4;
default:
return 0;
}
}
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, CValue *cv)
{
int n, i;
tok_add(tok_str, tok_len, t);
n = tok_ext_size(t);
for(i=0;i<n;i++)
tok_add(tok_str, tok_len, cv->tab[i]);
}
/* get a token from an integer array and increment pointer accordingly */
int tok_get(int **tok_str, CValue *cv)
{
int *p, t, n, i;
p = *tok_str;
t = *p++;
n = tok_ext_size(t);
for(i=0;i<n;i++)
cv->tab[i] = *p++;
*tok_str = p;
return t;
}
/* eval an expression for #if/#elif */
int expr_preprocess(void)
{
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_CINT;
tokc.i = c;
} else if (tok >= TOK_IDENT) {
/* if undefined macro */
tok = TOK_CINT;
tokc.i = 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;
}
#if defined(DEBUG) || defined(PP_DEBUG)
void tok_print(int *str)
{
int t;
CValue cval;
while (1) {
t = tok_get(&str, &cval);
if (!t)
break;
printf(" %s", get_tok_str(t, &cval));
}
printf("\n");
}
#endif
/* parse after #define */
void parse_define(void)
{
Sym *s, *first, **ps;
int v, t, *str, len;
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, NULL), t);
tok_print(str);
#endif
s = sym_push1(&define_stack, v, t, (int)str);
s->next = first;
}
void preprocess(void)
{
int size, i, c;
char buf[1024], *q, *p;
char buf1[1024];
BufferedFile *f;
Sym *s;
cinp();
next_nomacro();
redo:
if (tok == TOK_DEFINE) {
next_nomacro();
parse_define();
} else if (tok == TOK_UNDEF) {
next_nomacro();
s = sym_find1(&define_stack, tok);
/* undefine symbol by putting an invalid name */
if (s)
sym_undef(&define_stack, s);
} 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");
pstrcpy(buf, sizeof(buf), get_tok_str(tok, &tokc));
c = '\"';
}
/* eat all spaces and comments after include */
/* XXX: slightly incorrect */
while (ch1 != '\n' && ch1 != -1)
inp();
if (include_stack_ptr >= include_stack + INCLUDE_STACK_SIZE)
error("memory full");
if (c == '\"') {
/* first search in current dir if "header.h" */
size = 0;
p = strrchr(file->filename, '/');
if (p)
size = p + 1 - file->filename;
if (size > sizeof(buf1) - 1)
size = sizeof(buf1) - 1;
memcpy(buf1, file->filename, size);
buf1[size] = '\0';
pstrcat(buf1, sizeof(buf1), buf);
f = tcc_open(buf1);
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 = tcc_open(buf1);
if (f)
goto found;
}
error("include file '%s' not found", buf1);
f = NULL;
found:
/* push current file in stack */
/* XXX: fix current line init */
*include_stack_ptr++ = file;
file = f;
/* add include file debug info */
if (do_debug) {
put_stabs(file->filename, N_BINCL, 0, 0, 0);
}
} 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)
error("#else without matching #if");
if (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)
error("#elif without matching #if");
c = ifdef_stack_ptr[-1];
if (c > 1)
error("#elif after #else");
/* last #if/#elif expression was true: we skip */
if (c == 1)
goto skip;
c = expr_preprocess();
ifdef_stack_ptr[-1] = c;
test_skip:
if (!(c & 1)) {
skip:
preprocess_skip();
goto redo;
}
} else if (tok == TOK_ENDIF) {
if (ifdef_stack_ptr == ifdef_stack)
error("#endif without matching #if");
ifdef_stack_ptr--;
} else if (tok == TOK_LINE) {
next();
if (tok != TOK_CINT)
error("#line");
file->line_num = tokc.i;
skip_spaces();
if (ch != '\n') {
next();
if (tok != TOK_STR)
error("#line");
pstrcpy(file->filename, sizeof(file->filename),
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 if (ch == 'e' && gnu_ext)
c = 27;
else if (ch == '\'' || ch == '\"' || ch == '\\' || ch == '?')
c = ch;
else
error("invalid escaped char");
minp();
}
}
return c;
}
/* we use 64 bit numbers */
#define BN_SIZE 2
/* bn = (bn << shift) | or_val */
void bn_lshift(unsigned int *bn, int shift, int or_val)
{
int i;
unsigned int v;
for(i=0;i<BN_SIZE;i++) {
v = bn[i];
bn[i] = (v << shift) | or_val;
or_val = v >> (32 - shift);
}
}
void bn_zero(unsigned int *bn)
{
int i;
for(i=0;i<BN_SIZE;i++) {
bn[i] = 0;
}
}
void parse_number(void)
{
int b, t, shift, frac_bits, s, exp_val;
char *q;
unsigned int bn[BN_SIZE];
double d;
/* number */
q = token_buf;
t = ch;
cinp();
*q++ = t;
b = 10;
if (t == '.') {
/* special dot handling */
if (ch >= '0' && ch <= '9') {
goto float_frac_parse;
} else if (ch == '.') {
cinp();
if (ch != '.')
expect("'.'");
cinp();
tok = TOK_DOTS;
} else {
/* dots */
tok = t;
}
return;
} else if (t == '0') {
if (ch == 'x' || ch == 'X') {
q--;
cinp();
b = 16;
} else if (tcc_ext && (ch == 'b' || ch == 'B')) {
q--;
cinp();
b = 2;
}
}
/* parse all digits. cannot check octal numbers at this stage
because of floating point constants */
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 >= b)
break;
if (q >= token_buf + STRING_MAX_SIZE) {
num_too_long:
error("number too long");
}
*q++ = ch;
cinp();
}
if (ch == '.' ||
((ch == 'e' || ch == 'E') && b == 10) ||
((ch == 'p' || ch == 'P') && (b == 16 || b == 2))) {
if (b != 10) {
/* NOTE: strtox should support that for hexa numbers, but
non ISOC99 libcs do not support it, so we prefer to do
it by hand */
/* hexadecimal or binary floats */
/* XXX: handle overflows */
*q = '\0';
if (b == 16)
shift = 4;
else
shift = 2;
bn_zero(bn);
q = token_buf;
while (1) {
t = *q++;
if (t == '\0') {
break;
} else if (t >= 'a') {
t = t - 'a' + 10;
} else if (t >= 'A') {
t = t - 'A' + 10;
} else {
t = t - '0';
}
bn_lshift(bn, shift, t);
}
frac_bits = 0;
if (ch == '.') {
cinp();
while (1) {
t = ch;
if (t >= 'a' && t <= 'f') {
t = t - 'a' + 10;
} else if (t >= 'A' && t <= 'F') {
t = t - 'A' + 10;
} else if (t >= '0' && t <= '9') {
t = t - '0';
} else {
break;
}
if (t >= b)
error("invalid digit");
bn_lshift(bn, shift, t);
frac_bits += shift;
cinp();
}
}
if (ch != 'p' && ch != 'P')
error("exponent expected");
cinp();
s = 1;
exp_val = 0;
if (ch == '+') {
cinp();
} else if (ch == '-') {
s = -1;
cinp();
}
if (ch < '0' || ch > '9')
error("exponent digits expected");
while (ch >= '0' && ch <= '9') {
exp_val = exp_val * 10 + ch - '0';
cinp();
}
exp_val = exp_val * s;
/* now we can generate the number */
/* XXX: should patch directly float number */
d = (double)bn[1] * 4294967296.0 + (double)bn[0];
d = ldexp(d, exp_val - frac_bits);
t = toup(ch);
if (t == 'F') {
cinp();
tok = TOK_CFLOAT;
/* float : should handle overflow */
tokc.f = (float)d;
} else if (t == 'L') {
cinp();
tok = TOK_CLDOUBLE;
/* XXX: not large enough */
tokc.ld = (long double)d;
} else {
tok = TOK_CDOUBLE;
tokc.d = d;
}
} else {
/* decimal floats */
if (ch == '.') {
if (q >= token_buf + STRING_MAX_SIZE)
goto num_too_long;
*q++ = ch;
cinp();
float_frac_parse:
while (ch >= '0' && ch <= '9') {
if (q >= token_buf + STRING_MAX_SIZE)
goto num_too_long;
*q++ = ch;
cinp();
}
}
if (ch == 'e' || ch == 'E') {
if (q >= token_buf + STRING_MAX_SIZE)
goto num_too_long;
*q++ = ch;
cinp();
if (ch == '-' || ch == '+') {
if (q >= token_buf + STRING_MAX_SIZE)
goto num_too_long;
*q++ = ch;
cinp();
}
if (ch < '0' || ch > '9')
error("exponent digits expected");
while (ch >= '0' && ch <= '9') {
if (q >= token_buf + STRING_MAX_SIZE)
goto num_too_long;
*q++ = ch;
cinp();
}
}
*q = '\0';
t = toup(ch);
errno = 0;
if (t == 'F') {
cinp();
tok = TOK_CFLOAT;
tokc.f = strtof(token_buf, NULL);
} else if (t == 'L') {
cinp();
tok = TOK_CLDOUBLE;
tokc.ld = strtold(token_buf, NULL);
} else {
tok = TOK_CDOUBLE;
tokc.d = strtod(token_buf, NULL);
}
}
} else {
unsigned long long n, n1;
int lcount;
/* integer number */
*q = '\0';
q = token_buf;
if (b == 10 && *q == '0') {
b = 8;
q++;
}
n = 0;
while(1) {
t = *q++;
/* no need for checks except for base 10 / 8 errors */
if (t == '\0') {
break;
} else if (t >= 'a') {
t = t - 'a' + 10;
} else if (t >= 'A') {
t = t - 'A' + 10;
} else {
t = t - '0';
if (t >= b)
error("invalid digit");
}
n1 = n;
n = n * b + t;
/* detect overflow */
if (n < n1)
error("integer constant overflow");
}
/* XXX: not exactly ANSI compliant */
if ((n & 0xffffffff00000000LL) != 0) {
if ((n >> 63) != 0)
tok = TOK_CULLONG;
else
tok = TOK_CLLONG;
} else if (n > 0x7fffffff) {
tok = TOK_CUINT;
} else {
tok = TOK_CINT;
}
lcount = 0;
for(;;) {
t = toup(ch);
if (t == 'L') {
if (lcount >= 2)
error("three 'l' in integer constant");
lcount++;
if (lcount == 2) {
if (tok == TOK_CINT)
tok = TOK_CLLONG;
else if (tok == TOK_CUINT)
tok = TOK_CULLONG;
}
cinp();
} else if (t == 'U') {
if (tok == TOK_CINT)
tok = TOK_CUINT;
else if (tok == TOK_CLLONG)
tok = TOK_CULLONG;
cinp();
} else {
break;
}
}
if (tok == TOK_CINT || tok == TOK_CUINT)
tokc.ui = n;
else
tokc.ull = n;
}
}
/* return next token without macro substitution */
void next_nomacro1(void)
{
int b;
char *q;
TokenSym *ts;
/* skip spaces */
while(1) {
while (ch == '\n') {
cinp();
while (ch == ' ' || ch == '\t')
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') {
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) || ch == '.') {
parse_number();
} else if (ch == '\'') {
tok = TOK_CCHAR;
char_const:
minp();
tokc.i = 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.ts = 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->\313..\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)
tok = tok_get(&macro_ptr, &tokc);
} 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, notfirst, *str, len;
Sym *s;
TokenSym *ts;
CValue cval;
str = NULL;
len = 0;
last_tok = 0;
while(1) {
t = tok_get(&macro_str, &cval);
if (!t)
break;
if (t == '#') {
/* stringize */
t = tok_get(&macro_str, &cval);
if (!t)
break;
s = sym_find2(args, t);
if (s) {
token_buf[0] = '\0';
st = (int *)s->c;
notfirst = 0;
while (*st) {
if (notfirst)
pstrcat(token_buf, sizeof(token_buf), " ");
t = tok_get(&st, &cval);
pstrcat(token_buf, sizeof(token_buf), get_tok_str(t, &cval));
notfirst = 1;
}
#ifdef PP_DEBUG
printf("stringize: %s\n", token_buf);
#endif
/* add string */
ts = tok_alloc(token_buf, 0);
cval.ts = ts;
tok_add2(&str, &len, TOK_STR, &cval);
} else {
tok_add2(&str, &len, t, &cval);
}
} else if (t >= TOK_IDENT) {
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);
}
} else {
tok_add2(&str, &len, t, &cval);
}
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;
char *p;
CValue cval;
macro_str1 = NULL;
macro_str1_len = 0;
tok = 0;
while (1) {
next_nomacro();
if (tok == 0)
break;
while (*macro_ptr == TOK_TWOSHARPS) {
macro_ptr++;
macro_ptr1 = macro_ptr;
t = *macro_ptr;
if (t) {
t = tok_get(&macro_ptr, &cval);
/* XXX: we handle only most common cases:
ident + ident or ident + number */
if (tok >= TOK_IDENT &&
(t >= TOK_IDENT || t == TOK_CINT)) {
p = get_tok_str(tok, &tokc);
pstrcpy(token_buf, sizeof(token_buf), p);
p = get_tok_str(t, &cval);
pstrcat(token_buf, sizeof(token_buf), p);
ts = tok_alloc(token_buf, 0);
tok = ts->tok; /* modify current token */
} else {
/* cannot merge tokens: skip '##' */
macro_ptr = macro_ptr1;
break;
}
}
}
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;
CValue cval;
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__) {
cval.i = file->line_num;
tok_add2(tok_str, tok_len, TOK_CINT, &cval);
} else if (tok == TOK___FILE__) {
cval.ts = tok_alloc(file->filename, 0);
tok_add2(tok_str, tok_len, TOK_STR, &cval);
} else if (tok == TOK___DATE__) {
cval.ts = tok_alloc("Jan 1 1970", 0);
tok_add2(tok_str, tok_len, TOK_STR, &cval);
} else if (tok == TOK___TIME__) {
cval.ts = tok_alloc("00:00:00", 0);
tok_add2(tok_str, tok_len, TOK_STR, &cval);
} 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;
/* NOTE: empty args are allowed, except if no args */
for(;;) {
/* handle '()' case */
if (!args && tok == ')')
break;
if (!sa)
error("macro '%s' used with too many args",
get_tok_str(s->v, 0));
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;
if (tok != ',')
expect(",");
next_nomacro();
sa = sa->next;
}
if (sa->next)
error("macro '%s' used with too few args",
get_tok_str(s->v, 0));
/* 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(void)
{
int len, *ptr;
Sym *nested_list;
/* special 'ungettok' case for label parsing */
if (tok1) {
tok = tok1;
tokc = tok1c;
tok1 = 0;
} else {
redo:
if (!macro_ptr) {
/* if not reading from macro substituted 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;
}
}
}
#if defined(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 vsetc(int t, int r, CValue *vc)
{
if (vtop >= vstack + VSTACK_SIZE)
error("memory full");
/* cannot let cpu flags if other instruction are generated */
/* XXX: VT_JMP test too ? */
if ((vtop->r & VT_VALMASK) == VT_CMP)
gv(RC_INT);
vtop++;
vtop->t = t;
vtop->r = r;
vtop->r2 = VT_CONST;
vtop->c = *vc;
}
/* push integer constant */
void vpushi(int v)
{
CValue cval;
cval.i = v;
vsetc(VT_INT, VT_CONST, &cval);
}
void vset(int t, int r, int v)
{
CValue cval;
cval.i = v;
vsetc(t, r, &cval);
}
void vswap(void)
{
SValue tmp;
tmp = vtop[0];
vtop[0] = vtop[-1];
vtop[-1] = tmp;
}
void vpushv(SValue *v)
{
if (vtop >= vstack + VSTACK_SIZE)
error("memory full");
vtop++;
*vtop = *v;
}
void vdup(void)
{
vpushv(vtop);
}
/* save r to the memory stack, and mark it as being free */
void save_reg(int r)
{
int l, i, saved, t, size, align;
SValue *p, sv;
/* modify all stack values */
saved = 0;
l = 0;
for(p=vstack;p<=vtop;p++) {
i = p->r & VT_VALMASK;
if ((p->r & VT_VALMASK) == r ||
(p->r2 & VT_VALMASK) == r) {
/* must save value on stack if not already done */
if (!saved) {
/* store register in the stack */
t = p->t;
if ((p->r & VT_LVAL) ||
(!is_float(t) && (t & VT_BTYPE) != VT_LLONG))
t = VT_INT;
size = type_size(t, &align);
loc = (loc - size) & -align;
sv.t = t;
sv.r = VT_LOCAL | VT_LVAL;
sv.c.ul = loc;
store(r, &sv);
/* XXX: x86 specific: need to pop fp register ST0 if saved */
if (r == REG_ST0) {
o(0xd9dd); /* fstp %st(1) */
}
/* special long long case */
if ((p->t & VT_BTYPE) == VT_LLONG) {
sv.c.ul += 4;
store(p->r2, &sv);
}
l = loc;
saved = 1;
}
/* mark that stack entry as being saved on the stack */
if (p->r & VT_LVAL)
t = VT_LLOCAL;
else
t = VT_LOCAL;
p->r = VT_LVAL | t;
p->r2 = VT_CONST;
p->c.ul = l;
}
}
}
/* find a free register of class 'rc'. If none, save one register */
int get_reg(int rc)
{
int r;
SValue *p;
/* find a free register */
for(r=0;r<NB_REGS;r++) {
if (reg_classes[r] & rc) {
for(p=vstack;p<=vtop;p++) {
if ((p->r & VT_VALMASK) == r ||
(p->r2 & VT_VALMASK) == 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_opi()) */
for(p=vstack;p<=vtop;p++) {
r = p->r & VT_VALMASK;
if (r < VT_CONST && (reg_classes[r] & rc)) {
save_reg(r);
break;
}
}
return r;
}
void save_regs(void)
{
int r;
SValue *p;
for(p=vstack;p<=vtop;p++) {
r = p->r & 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(int r, int s)
{
SValue sv;
if (r != s) {
save_reg(r);
sv.t = VT_INT;
sv.r = s;
sv.c.ul = 0;
load(r, &sv);
}
}
/* get address of vtop (vtop MUST BE an lvalue) */
void gaddrof(void)
{
vtop->r &= ~VT_LVAL;
/* tricky: if saved lvalue, then we can go back to lvalue */
if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
vtop->r = (vtop->r & ~VT_VALMASK) | VT_LOCAL | VT_LVAL;
}
/* generate lvalue bound code */
void gbound(void)
{
vtop->r &= ~VT_MUSTBOUND;
/* if lvalue, then use checking code before dereferencing */
if (vtop->r & VT_LVAL) {
gaddrof();
vpushi(0);
gen_bounded_ptr_add1();
gen_bounded_ptr_add2(1);
vtop->r |= VT_LVAL;
}
}
/* store vtop a register belonging to class 'rc'. lvalues are
converted to values. Cannot be used if cannot be converted to
register value (such as structures). */
int gv(int rc)
{
int r, r2, rc2, bit_pos, bit_size, size, align, i, data_offset;
unsigned long long ll;
/* NOTE: get_reg can modify vstack[] */
if (vtop->t & VT_BITFIELD) {
bit_pos = (vtop->t >> VT_STRUCT_SHIFT) & 0x3f;
bit_size = (vtop->t >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
/* remove bit field info to avoid loops */
vtop->t &= ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
/* generate shifts */
vpushi(32 - (bit_pos + bit_size));
gen_op(TOK_SHL);
vpushi(32 - bit_size);
/* NOTE: transformed to SHR if unsigned */
gen_op(TOK_SAR);
r = gv(rc);
} else {
if (is_float(vtop->t) &&
(vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
/* CPUs usually cannot use float constants, so we store them
generically in data segment */
size = type_size(vtop->t, &align);
data_offset = (int)data_section->data_ptr;
data_offset = (data_offset + align - 1) & -align;
/* XXX: not portable yet */
size = size >> 2;
for(i=0;i<size;i++)
((int *)data_offset)[i] = vtop->c.tab[i];
vtop->r |= VT_LVAL;
vtop->c.ul = data_offset;
data_offset += size << 2;
data_section->data_ptr = (unsigned char *)data_offset;
}
if (vtop->r & VT_MUSTBOUND)
gbound();
r = vtop->r & VT_VALMASK;
/* need to reload if:
- constant
- lvalue (need to dereference pointer)
- already a register, but not in the right class */
if (r >= VT_CONST ||
(vtop->r & VT_LVAL) ||
!(reg_classes[r] & rc) ||
((vtop->t & VT_BTYPE) == VT_LLONG &&
!(reg_classes[vtop->r2] & rc))) {
r = get_reg(rc);
if ((vtop->t & VT_BTYPE) == VT_LLONG) {
/* two register type load : expand to two words
temporarily */
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
/* load constant */
ll = vtop->c.ull;
vtop->c.ui = ll; /* first word */
load(r, vtop);
vtop->r = r; /* save register value */
vpushi(ll >> 32); /* second word */
} else if (r >= VT_CONST ||
(vtop->r & VT_LVAL)) {
/* load from memory */
load(r, vtop);
vdup();
vtop[-1].r = r; /* save register value */
/* increment pointer to get second word */
vtop->t = VT_INT;
gaddrof();
vpushi(4);
gen_op('+');
vtop->r |= VT_LVAL;
} else {
/* move registers */
load(r, vtop);
vdup();
vtop[-1].r = r; /* save register value */
vtop->r = vtop[-1].r2;
}
/* allocate second register */
rc2 = RC_INT;
if (rc == RC_IRET)
rc2 = RC_LRET;
r2 = get_reg(rc2);
load(r2, vtop);
vpop();
/* write second register */
vtop->r2 = r2;
} else {
/* one register type load */
load(r, vtop);
}
}
vtop->r = r;
}
return r;
}
/* generate vtop[-1] and vtop[0] in resp. classes rc1 and rc2 */
void gv2(int rc1, int rc2)
{
/* generate more generic register first */
if (rc1 <= rc2) {
vswap();
gv(rc1);
vswap();
gv(rc2);
/* test if reload is needed for first register */
if ((vtop[-1].r & VT_VALMASK) >= VT_CONST) {
vswap();
gv(rc1);
vswap();
}
} else {
gv(rc2);
vswap();
gv(rc1);
vswap();
/* test if reload is needed for first register */
if ((vtop[0].r & VT_VALMASK) >= VT_CONST) {
gv(rc2);
}
}
}
/* expand long long on stack in two int registers */
void lexpand(void)
{
int u;
u = vtop->t & VT_UNSIGNED;
gv(RC_INT);
vdup();
vtop[0].r = vtop[-1].r2;
vtop[0].r2 = VT_CONST;
vtop[-1].r2 = VT_CONST;
vtop[0].t = VT_INT | u;
vtop[-1].t = VT_INT | u;
}
/* build a long long from two ints */
void lbuild(int t)
{
gv2(RC_INT, RC_INT);
vtop[-1].r2 = vtop[0].r;
vtop[-1].t = t;
vpop();
}
/* rotate n first stack elements to the bottom */
void vrotb(int n)
{
int i;
SValue tmp;
tmp = vtop[-n + 1];
for(i=-n+1;i!=0;i++)
vtop[i] = vtop[i+1];
vtop[0] = tmp;
}
/* pop stack value */
void vpop(void)
{
/* for x86, we need to pop the FP stack */
if ((vtop->r & VT_VALMASK) == REG_ST0) {
o(0xd9dd); /* fstp %st(1) */
}
vtop--;
}
/* convert stack entry to register and duplicate its value in another
register */
void gv_dup(void)
{
int rc, t, r, r1;
SValue sv;
t = vtop->t;
if ((t & VT_BTYPE) == VT_LLONG) {
lexpand();
gv_dup();
vswap();
vrotb(3);
gv_dup();
vrotb(4);
/* stack: H L L1 H1 */
lbuild(t);
vrotb(3);
vrotb(3);
vswap();
lbuild(t);
vswap();
} else {
/* duplicate value */
rc = RC_INT;
sv.t = VT_INT;
if (is_float(t)) {
rc = RC_FLOAT;
sv.t = t;
}
r = gv(rc);
r1 = get_reg(rc);
sv.r = r;
sv.c.ul = 0;
load(r1, &sv); /* move r to r1 */
vdup();
/* duplicates value */
vtop->r = r1;
}
}
/* generate CPU independent (unsigned) long long operations */
void gen_opl(int op)
{
int t, a, b, op1, c, i;
void *func;
GFuncContext gf;
SValue tmp;
switch(op) {
case '/':
case TOK_PDIV:
func = __divll;
goto gen_func;
case TOK_UDIV:
func = __divull;
goto gen_func;
case '%':
func = __modll;
goto gen_func;
case TOK_UMOD:
func = __modull;
gen_func:
/* call generic long long function */
gfunc_start(&gf, FUNC_CDECL);
gfunc_param(&gf);
gfunc_param(&gf);
vpushi((int)func);
gfunc_call(&gf);
vpushi(0);
vtop->r = REG_IRET;
vtop->r2 = REG_LRET;
break;
case '^':
case '&':
case '|':
case '*':
case '+':
case '-':
t = vtop->t;
vswap();
lexpand();
vrotb(3);
lexpand();
/* stack: L1 H1 L2 H2 */
tmp = vtop[0];
vtop[0] = vtop[-3];
vtop[-3] = tmp;
tmp = vtop[-2];
vtop[-2] = vtop[-3];
vtop[-3] = tmp;
vswap();
/* stack: H1 H2 L1 L2 */
if (op == '*') {
vpushv(vtop - 1);
vpushv(vtop - 1);
gen_op(TOK_UMULL);
lexpand();
/* stack: H1 H2 L1 L2 ML MH */
for(i=0;i<4;i++)
vrotb(6);
/* stack: ML MH H1 H2 L1 L2 */
tmp = vtop[0];
vtop[0] = vtop[-2];
vtop[-2] = tmp;
/* stack: ML MH H1 L2 H2 L1 */
gen_op('*');
vrotb(3);
vrotb(3);
gen_op('*');
/* stack: ML MH M1 M2 */
gen_op('+');
gen_op('+');
} else if (op == '+' || op == '-') {
/* XXX: add non carry method too (for MIPS or alpha) */
if (op == '+')
op1 = TOK_ADDC1;
else
op1 = TOK_SUBC1;
gen_op(op1);
/* stack: H1 H2 (L1 op L2) */
vrotb(3);
vrotb(3);
gen_op(op1 + 1); /* TOK_xxxC2 */
} else {
gen_op(op);
/* stack: H1 H2 (L1 op L2) */
vrotb(3);
vrotb(3);
/* stack: (L1 op L2) H1 H2 */
gen_op(op);
/* stack: (L1 op L2) (H1 op H2) */
}
/* stack: L H */
lbuild(t);
break;
case TOK_SAR:
case TOK_SHR:
case TOK_SHL:
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_FORWARD)) == VT_CONST) {
t = vtop[-1].t;
vswap();
lexpand();
vrotb(3);
/* stack: L H shift */
c = (int)vtop->c.i;
/* constant: simpler */
/* NOTE: all comments are for SHL. the other cases are
done by swaping words */
vpop();
if (op != TOK_SHL)
vswap();
if (c >= 32) {
/* stack: L H */
vpop();
if (c > 32) {
vpushi(c - 32);
gen_op(op);
}
if (op != TOK_SAR) {
vpushi(0);
} else {
gv_dup();
vpushi(31);
gen_op(TOK_SAR);
}
vswap();
} else {
vswap();
gv_dup();
/* stack: H L L */
vpushi(c);
gen_op(op);
vswap();
vpushi(32 - c);
if (op == TOK_SHL)
gen_op(TOK_SHR);
else
gen_op(TOK_SHL);
vrotb(3);
/* stack: L L H */
vpushi(c);
gen_op(op);
gen_op('|');
}
if (op != TOK_SHL)
vswap();
lbuild(t);
} else {
/* XXX: should provide a faster fallback on x86 ? */
switch(op) {
case TOK_SAR:
func = __sardi3;
goto gen_func;
case TOK_SHR:
func = __shrdi3;
goto gen_func;
case TOK_SHL:
func = __shldi3;
goto gen_func;
}
}
break;
default:
/* compare operations */
t = vtop->t;
vswap();
lexpand();
vrotb(3);
lexpand();
/* stack: L1 H1 L2 H2 */
tmp = vtop[-1];
vtop[-1] = vtop[-2];
vtop[-2] = tmp;
/* stack: L1 L2 H1 H2 */
/* compare high */
op1 = op;
/* when values are equal, we need to compare low words. since
the jump is inverted, we invert the test too. */
if (op1 == TOK_LT)
op1 = TOK_LE;
else if (op1 == TOK_GT)
op1 = TOK_GE;
else if (op1 == TOK_ULT)
op1 = TOK_ULE;
else if (op1 == TOK_UGT)
op1 = TOK_UGE;
a = 0;
b = 0;
gen_op(op1);
if (op1 != TOK_NE) {
a = gtst(1, 0);
}
if (op != TOK_EQ) {
/* generate non equal test */
/* XXX: NOT PORTABLE yet */
if (a == 0)
b = gtst(0, 0);
else
b = psym(0x850f, 0);
}
/* compare low */
gen_op(op);
a = gtst(1, a);
gsym(b);
vset(VT_INT, VT_JMPI, a);
break;
}
}
/* handle constant optimizations and various machine independant opt */
void gen_opc(int op)
{
int fc, c1, c2, n;
SValue *v1, *v2;
v1 = vtop - 1;
v2 = vtop;
/* currently, we cannot do computations with forward symbols */
c1 = (v1->r & (VT_VALMASK | VT_LVAL | VT_FORWARD)) == VT_CONST;
c2 = (v2->r & (VT_VALMASK | VT_LVAL | VT_FORWARD)) == VT_CONST;
if (c1 && c2) {
fc = v2->c.i;
switch(op) {
case '+': v1->c.i += fc; break;
case '-': v1->c.i -= fc; break;
case '&': v1->c.i &= fc; break;
case '^': v1->c.i ^= fc; break;
case '|': v1->c.i |= fc; break;
case '*': v1->c.i *= fc; break;
case TOK_PDIV:
case '/':
case '%':
case TOK_UDIV:
case TOK_UMOD:
/* if division by zero, generate explicit division */
if (fc == 0) {
if (const_wanted)
error("division by zero in constant");
goto general_case;
}
switch(op) {
default: v1->c.i /= fc; break;
case '%': v1->c.i %= fc; break;
case TOK_UDIV: v1->c.i = (unsigned)v1->c.i / fc; break;
case TOK_UMOD: v1->c.i = (unsigned)v1->c.i % fc; break;
}
break;
case TOK_SHL: v1->c.i <<= fc; break;
case TOK_SHR: v1->c.i = (unsigned)v1->c.i >> fc; break;
case TOK_SAR: v1->c.i >>= fc; break;
/* tests */
case TOK_ULT: v1->c.i = (unsigned)v1->c.i < (unsigned)fc; break;
case TOK_UGE: v1->c.i = (unsigned)v1->c.i >= (unsigned)fc; break;
case TOK_EQ: v1->c.i = v1->c.i == fc; break;
case TOK_NE: v1->c.i = v1->c.i != fc; break;
case TOK_ULE: v1->c.i = (unsigned)v1->c.i <= (unsigned)fc; break;
case TOK_UGT: v1->c.i = (unsigned)v1->c.i > (unsigned)fc; break;
case TOK_LT: v1->c.i = v1->c.i < fc; break;
case TOK_GE: v1->c.i = v1->c.i >= fc; break;
case TOK_LE: v1->c.i = v1->c.i <= fc; break;
case TOK_GT: v1->c.i = v1->c.i > fc; break;
/* logical */
case TOK_LAND: v1->c.i = v1->c.i && fc; break;
case TOK_LOR: v1->c.i = v1->c.i || fc; break;
default:
goto general_case;
}
vtop--;
} else {
/* if commutative ops, put c2 as constant */
if (c1 && (op == '+' || op == '&' || op == '^' ||
op == '|' || op == '*')) {
vswap();
swap(&c1, &c2);
}
fc = vtop->c.i;
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))) {
/* nothing to do */
vtop--;
} 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++;
}
vtop->c.i = n;
if (op == '*')
op = TOK_SHL;
else if (op == TOK_PDIV)
op = TOK_SAR;
else
op = TOK_SHR;
}
goto general_case;
} else {
general_case:
/* call low level op generator */
gen_opi(op);
}
}
}
int pointed_size(int t)
{
return type_size(pointed_type(t), &t);
}
#if 0
void check_pointer_types(SValue *p1, SValue *p2)
{
char buf1[256], buf2[256];
int t1, t2;
t1 = p1->t;
t2 = p2->t;
if (!is_compatible_types(t1, t2)) {
type_to_str(buf1, sizeof(buf1), t1, NULL);
type_to_str(buf2, sizeof(buf2), t2, NULL);
error("incompatible pointers '%s' and '%s'", buf1, buf2);
}
}
#endif
/* generic gen_op: handles types problems */
void gen_op(int op)
{
int u, t1, t2, bt1, bt2, t;
t1 = vtop[-1].t;
t2 = vtop[0].t;
bt1 = t1 & VT_BTYPE;
bt2 = t2 & VT_BTYPE;
if (bt1 == VT_PTR || bt2 == VT_PTR) {
/* at least one operand is a pointer */
/* relationnal op: must be both pointers */
if (op >= TOK_ULT && op <= TOK_GT) {
// check_pointer_types(vtop, vtop - 1);
/* pointers are handled are unsigned */
t = VT_INT | VT_UNSIGNED;
goto std_op;
}
/* if both pointers, then it must be the '-' op */
if ((t1 & VT_BTYPE) == VT_PTR &&
(t2 & VT_BTYPE) == VT_PTR) {
if (op != '-')
error("cannot use pointers here");
// check_pointer_types(vtop - 1, vtop);
/* XXX: check that types are compatible */
u = pointed_size(t1);
gen_opc(op);
/* set to integer type */
vtop->t = VT_INT;
vpushi(u);
gen_op(TOK_PDIV);
} else {
/* exactly one pointer : must be '+' or '-'. */
if (op != '-' && op != '+')
error("cannot use pointers here");
/* Put pointer as first operand */
if ((t2 & VT_BTYPE) == VT_PTR) {
vswap();
swap(&t1, &t2);
}
/* XXX: cast to int ? (long long case) */
vpushi(pointed_size(vtop[-1].t));
gen_op('*');
/* if evaluating constant expression, no code should be
generated, so no bound check */
if (do_bounds_check && !const_wanted) {
/* if bounded pointers, we generate a special code to
test bounds */
if (op == '-') {
vpushi(0);
vswap();
gen_op('-');
}
gen_bounded_ptr_add1();
gen_bounded_ptr_add2(0);
} else {
gen_opc(op);
}
/* put again type if gen_opc() swaped operands */
vtop->t = t1;
}
} else if (is_float(bt1) || is_float(bt2)) {
/* compute bigger type and do implicit casts */
if (bt1 == VT_LDOUBLE || bt2 == VT_LDOUBLE) {
t = VT_LDOUBLE;
} else if (bt1 == VT_DOUBLE || bt2 == VT_DOUBLE) {
t = VT_DOUBLE;
} else {
t = VT_FLOAT;
}
/* floats can only be used for a few operations */
if (op != '+' && op != '-' && op != '*' && op != '/' &&
(op < TOK_ULT || op > TOK_GT))
error("invalid operands for binary operation");
goto std_op;
} else if (bt1 == VT_LLONG || bt2 == VT_LLONG) {
/* cast to biggest op */
t = VT_LLONG;
/* convert to unsigned if it does not fit in a long long */
if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED) ||
(t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_LLONG | VT_UNSIGNED))
t |= VT_UNSIGNED;
goto std_op;
} else {
/* integer operations */
t = VT_INT;
/* convert to unsigned if it does not fit in an integer */
if ((t1 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED) ||
(t2 & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
t |= VT_UNSIGNED;
std_op:
/* XXX: currently, some unsigned operations are explicit, so
we modify them here */
if (t & VT_UNSIGNED) {
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;
}
vswap();
gen_cast(t);
vswap();
/* special case for shifts and long long: we keep the shift as
an integer */
if (op == TOK_SHR || op == TOK_SAR || op == TOK_SHL)
gen_cast(VT_INT);
else
gen_cast(t);
if (is_float(t))
gen_opf(op);
else if ((t & VT_BTYPE) == VT_LLONG)
gen_opl(op);
else
gen_opc(op);
if (op >= TOK_ULT && op <= TOK_GT) {
/* relationnal op: the result is an int */
vtop->t = VT_INT;
} else {
vtop->t = t;
}
}
}
/* generic itof for unsigned long long case */
void gen_cvt_itof1(int t)
{
GFuncContext gf;
if ((vtop->t & (VT_BTYPE | VT_UNSIGNED)) ==
(VT_LLONG | VT_UNSIGNED)) {
gfunc_start(&gf, FUNC_CDECL);
gfunc_param(&gf);
if (t == VT_FLOAT)
vpushi((int)&__ulltof);
else if (t == VT_DOUBLE)
vpushi((int)&__ulltod);
else
vpushi((int)&__ulltold);
gfunc_call(&gf);
vpushi(0);
vtop->r = REG_FRET;
} else {
gen_cvt_itof(t);
}
}
/* generic ftoi for unsigned long long case */
void gen_cvt_ftoi1(int t)
{
GFuncContext gf;
int st;
if (t == (VT_LLONG | VT_UNSIGNED)) {
/* not handled natively */
gfunc_start(&gf, FUNC_CDECL);
st = vtop->t & VT_BTYPE;
gfunc_param(&gf);
if (st == VT_FLOAT)
vpushi((int)&__ftoull);
else if (st == VT_DOUBLE)
vpushi((int)&__dtoull);
else
vpushi((int)&__ldtoull);
gfunc_call(&gf);
vpushi(0);
vtop->r = REG_IRET;
vtop->r2 = REG_LRET;
} else {
gen_cvt_ftoi(t);
}
}
/* force char or short cast */
void force_charshort_cast(int t)
{
int bits, dbt;
dbt = t & VT_BTYPE;
/* XXX: add optimization if lvalue : just change type and offset */
if (dbt == VT_BYTE)
bits = 8;
else
bits = 16;
if (t & VT_UNSIGNED) {
vpushi((1 << bits) - 1);
gen_op('&');
} else {
bits = 32 - bits;
vpushi(bits);
gen_op(TOK_SHL);
vpushi(bits);
gen_op(TOK_SAR);
}
}
/* cast 'vtop' to 't' type */
void gen_cast(int t)
{
int sbt, dbt, sf, df, c, st1, dt1;
/* special delayed cast for char/short */
/* XXX: in some cases (multiple cascaded casts), it may still
be incorrect */
if (vtop->r & VT_MUSTCAST) {
vtop->r &= ~VT_MUSTCAST;
force_charshort_cast(vtop->t);
}
dbt = t & VT_BTYPE;
sbt = vtop->t & VT_BTYPE;
if (sbt != dbt) {
sf = is_float(sbt);
df = is_float(dbt);
c = (vtop->r & (VT_VALMASK | VT_LVAL | VT_FORWARD)) == VT_CONST;
if (sf && df) {
/* convert from fp to fp */
if (c) {
/* constant case: we can do it now */
/* XXX: in ISOC, cannot do it if error in convert */
if (dbt == VT_FLOAT && sbt == VT_DOUBLE)
vtop->c.f = (float)vtop->c.d;
else if (dbt == VT_FLOAT && sbt == VT_LDOUBLE)
vtop->c.f = (float)vtop->c.ld;
else if (dbt == VT_DOUBLE && sbt == VT_FLOAT)
vtop->c.d = (double)vtop->c.f;
else if (dbt == VT_DOUBLE && sbt == VT_LDOUBLE)
vtop->c.d = (double)vtop->c.ld;
else if (dbt == VT_LDOUBLE && sbt == VT_FLOAT)
vtop->c.ld = (long double)vtop->c.f;
else if (dbt == VT_LDOUBLE && sbt == VT_DOUBLE)
vtop->c.ld = (long double)vtop->c.d;
} else {
/* non constant case: generate code */
gen_cvt_ftof(dbt);
}
} else if (df) {
/* convert int to fp */
st1 = vtop->t & (VT_BTYPE | VT_UNSIGNED);
if (c) {
switch(st1) {
case VT_LLONG | VT_UNSIGNED:
case VT_LLONG:
/* XXX: add const cases for long long */
goto do_itof;
case VT_INT | VT_UNSIGNED:
switch(dbt) {
case VT_FLOAT: vtop->c.f = (float)vtop->c.ui; break;
case VT_DOUBLE: vtop->c.d = (double)vtop->c.ui; break;
case VT_LDOUBLE: vtop->c.ld = (long double)vtop->c.ui; break;
}
break;
default:
switch(dbt) {
case VT_FLOAT: vtop->c.f = (float)vtop->c.i; break;
case VT_DOUBLE: vtop->c.d = (double)vtop->c.i; break;
case VT_LDOUBLE: vtop->c.ld = (long double)vtop->c.i; break;
}
break;
}
} else {
do_itof:
gen_cvt_itof1(dbt);
}
} else if (sf) {
/* convert fp to int */
dt1 = t & (VT_BTYPE | VT_UNSIGNED);
/* we handle char/short/etc... with generic code */
if (dt1 != (VT_INT | VT_UNSIGNED) &&
dt1 != (VT_LLONG | VT_UNSIGNED) &&
dt1 != VT_LLONG)
dt1 = VT_INT;
if (c) {
switch(dt1) {
case VT_LLONG | VT_UNSIGNED:
case VT_LLONG:
/* XXX: add const cases for long long */
goto do_ftoi;
case VT_INT | VT_UNSIGNED:
switch(sbt) {
case VT_FLOAT: vtop->c.ui = (unsigned int)vtop->c.d; break;
case VT_DOUBLE: vtop->c.ui = (unsigned int)vtop->c.d; break;
case VT_LDOUBLE: vtop->c.ui = (unsigned int)vtop->c.d; break;
}
break;
default:
/* int case */
switch(sbt) {
case VT_FLOAT: vtop->c.i = (int)vtop->c.d; break;
case VT_DOUBLE: vtop->c.i = (int)vtop->c.d; break;
case VT_LDOUBLE: vtop->c.i = (int)vtop->c.d; break;
}
break;
}
} else {
do_ftoi:
gen_cvt_ftoi1(dt1);
}
if (dt1 == VT_INT && (t & (VT_BTYPE | VT_UNSIGNED)) != dt1) {
/* additionnal cast for char/short/bool... */
vtop->t = dt1;
gen_cast(t);
}
} else if (dbt == VT_LLONG) {
/* scalar to long long */
if (c) {
if ((vtop->t & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED))
vtop->c.ll = vtop->c.ui;
else
vtop->c.ll = vtop->c.i;
} else {
/* machine independant conversion */
gv(RC_INT);
/* generate high word */
if ((vtop->t & (VT_BTYPE | VT_UNSIGNED)) == (VT_INT | VT_UNSIGNED)) {
vpushi(0);
gv(RC_INT);
} else {
gv_dup();
vpushi(31);
gen_op(TOK_SAR);
}
/* patch second register */
vtop[-1].r2 = vtop->r;
vpop();
}
} else if (dbt == VT_BOOL) {
/* scalar to bool */
vpushi(0);
gen_op(TOK_NE);
} else if (dbt == VT_BYTE || dbt == VT_SHORT) {
force_charshort_cast(t);
} else if (dbt == VT_INT) {
/* scalar to int */
if (sbt == VT_LLONG) {
/* from long long: just take low order word */
lexpand();
vpop();
} else if (sbt == VT_PTR) {
/* ok to cast */
} else if (vtop->r & VT_LVAL) {
/* if lvalue and single word type, nothing to do (XXX:
maybe incorrect for sizeof op) */
goto no_cast;
}
}
}
vtop->t = t;
no_cast: ;
}
/* return type size. Put alignment at 'a' */
int type_size(int t, int *a)
{
Sym *s;
int bt;
bt = t & VT_BTYPE;
if (bt == 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 (bt == VT_PTR) {
if (t & VT_ARRAY) {
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT));
return type_size(s->t, a) * s->c;
} else {
*a = PTR_SIZE;
return PTR_SIZE;
}
} else if (bt == VT_LDOUBLE) {
*a = LDOUBLE_ALIGN;
return LDOUBLE_SIZE;
} else if (bt == VT_DOUBLE || bt == VT_LLONG) {
*a = 8;
return 8;
} else if (bt == VT_INT || bt == VT_ENUM || bt == VT_FLOAT) {
*a = 4;
return 4;
} else if (bt == VT_SHORT) {
*a = 2;
return 2;
} else {
/* char, void, function, _Bool */
*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_TYPE);
}
int mk_pointer(int t)
{
int p;
p = anon_sym++;
sym_push(p, t, 0, -1);
return VT_PTR | (p << VT_STRUCT_SHIFT) | (t & ~VT_TYPE);
}
int is_compatible_types(int t1, int t2)
{
Sym *s1, *s2;
int bt1, bt2;
t1 &= VT_TYPE;
t2 &= VT_TYPE;
bt1 = t1 & VT_BTYPE;
bt2 = t2 & VT_BTYPE;
if (bt1 == VT_PTR) {
t1 = pointed_type(t1);
/* if function, then convert implicitely to function pointer */
if (bt2 != VT_FUNC) {
if (bt2 != VT_PTR)
return 0;
t2 = pointed_type(t2);
}
/* void matches everything */
t1 &= VT_TYPE;
t2 &= VT_TYPE;
if (t1 == VT_VOID || t2 == VT_VOID)
return 1;
return is_compatible_types(t1, t2);
} else if (bt1 == VT_STRUCT) {
return (t2 == t1);
} else if (bt1 == VT_FUNC) {
if (bt2 != VT_FUNC)
return 0;
s1 = sym_find(((unsigned)t1 >> VT_STRUCT_SHIFT));
s2 = sym_find(((unsigned)t2 >> VT_STRUCT_SHIFT));
if (!is_compatible_types(s1->t, s2->t))
return 0;
/* XXX: not complete */
if (s1->c == FUNC_OLD || s2->c == FUNC_OLD)
return 1;
if (s1->c != s2->c)
return 0;
while (s1 != NULL) {
if (s2 == NULL)
return 0;
if (!is_compatible_types(s1->t, s2->t))
return 0;
s1 = s1->next;
s2 = s2->next;
}
if (s2)
return 0;
return 1;
} else {
/* XXX: not complete */
return 1;
}
}
/* print a type. If 'varstr' is not NULL, then the variable is also
printed in the type */
/* XXX: union */
/* XXX: add array and function pointers */
void type_to_str(char *buf, int buf_size,
int t, const char *varstr)
{
int bt, v;
Sym *s, *sa;
char buf1[256];
const char *tstr;
t = t & VT_TYPE;
bt = t & VT_BTYPE;
buf[0] = '\0';
if (t & VT_UNSIGNED)
pstrcat(buf, buf_size, "unsigned ");
switch(bt) {
case VT_VOID:
tstr = "void";
goto add_tstr;
case VT_BOOL:
tstr = "_Bool";
goto add_tstr;
case VT_BYTE:
tstr = "char";
goto add_tstr;
case VT_SHORT:
tstr = "short";
goto add_tstr;
case VT_INT:
tstr = "int";
goto add_tstr;
case VT_LONG:
tstr = "long";
goto add_tstr;
case VT_LLONG:
tstr = "long long";
goto add_tstr;
case VT_FLOAT:
tstr = "float";
goto add_tstr;
case VT_DOUBLE:
tstr = "double";
goto add_tstr;
case VT_LDOUBLE:
tstr = "long double";
add_tstr:
pstrcat(buf, buf_size, tstr);
break;
case VT_ENUM:
case VT_STRUCT:
if (bt == VT_STRUCT)
tstr = "struct ";
else
tstr = "enum ";
pstrcat(buf, buf_size, tstr);
v = (unsigned)t >> VT_STRUCT_SHIFT;
if (v >= SYM_FIRST_ANOM)
pstrcat(buf, buf_size, "<anonymous>");
else
pstrcat(buf, buf_size, get_tok_str(v, NULL));
break;
case VT_FUNC:
s = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
type_to_str(buf, buf_size, s->t, varstr);
pstrcat(buf, buf_size, "(");
sa = s->next;
while (sa != NULL) {
type_to_str(buf1, sizeof(buf1), sa->t, NULL);
pstrcat(buf, buf_size, buf1);
sa = sa->next;
if (sa)
pstrcat(buf, buf_size, ", ");
}
pstrcat(buf, buf_size, ")");
goto no_var;
case VT_PTR:
s = sym_find((unsigned)t >> VT_STRUCT_SHIFT);
pstrcpy(buf1, sizeof(buf1), "*");
if (varstr)
pstrcat(buf1, sizeof(buf1), varstr);
type_to_str(buf, buf_size, s->t, buf1);
goto no_var;
}
if (varstr) {
pstrcat(buf, buf_size, " ");
pstrcat(buf, buf_size, varstr);
}
no_var: ;
}
/* verify type compatibility to store vtop in 'dt' type, and generate
casts if needed. */
void gen_assign_cast(int dt)
{
int st;
char buf1[256], buf2[256];
st = vtop->t; /* source type */
if ((dt & VT_BTYPE) == VT_PTR) {
/* special cases for pointers */
/* a function is implicitely a function pointer */
if ((st & VT_BTYPE) == VT_FUNC) {
if (!is_compatible_types(pointed_type(dt), st))
goto error;
else
goto type_ok;
}
/* '0' can also be a pointer */
if ((st & VT_BTYPE) == VT_INT &&
((vtop->r & (VT_VALMASK | VT_LVAL | VT_FORWARD)) == VT_CONST) &&
vtop->c.i == 0)
goto type_ok;
}
if (!is_compatible_types(dt, st)) {
error:
type_to_str(buf1, sizeof(buf1), st, NULL);
type_to_str(buf2, sizeof(buf2), dt, NULL);
error("cannot cast '%s' to '%s'", buf1, buf2);
}
type_ok:
gen_cast(dt);
}
/* store vtop in lvalue pushed on stack */
void vstore(void)
{
int sbt, dbt, ft, r, t, size, align, bit_size, bit_pos, rc, delayed_cast;
GFuncContext gf;
ft = vtop[-1].t;
sbt = vtop->t & VT_BTYPE;
dbt = ft & VT_BTYPE;
if (((sbt == VT_INT || sbt == VT_SHORT) && dbt == VT_BYTE) ||
(sbt == VT_INT && dbt == VT_SHORT)) {
/* optimize char/short casts */
delayed_cast = VT_MUSTCAST;
vtop->t = ft & VT_TYPE;
} else {
delayed_cast = 0;
gen_assign_cast(ft & VT_TYPE);
}
if (sbt == VT_STRUCT) {
/* if structure, only generate pointer */
/* structure assignment : generate memcpy */
/* XXX: optimize if small size */
vdup();
gfunc_start(&gf, FUNC_CDECL);
/* type size */
size = type_size(vtop->t, &align);
vpushi(size);
gfunc_param(&gf);
/* source */
vtop->t = VT_INT;
gaddrof();
gfunc_param(&gf);
/* destination */
vswap();
vtop->t = VT_INT;
gaddrof();
gfunc_param(&gf);
save_regs();
vpushi((int)&memcpy);
gfunc_call(&gf);
/* leave source on stack */
} else if (ft & VT_BITFIELD) {
/* bitfield store handling */
bit_pos = (ft >> VT_STRUCT_SHIFT) & 0x3f;
bit_size = (ft >> (VT_STRUCT_SHIFT + 6)) & 0x3f;
/* remove bit field info to avoid loops */
vtop[-1].t = ft & ~(VT_BITFIELD | (-1 << VT_STRUCT_SHIFT));
/* duplicate destination */
vdup();
vtop[-1] = vtop[-2];
/* mask and shift source */
vpushi((1 << bit_size) - 1);
gen_op('&');
vpushi(bit_pos);
gen_op(TOK_SHL);
/* load destination, mask and or with source */
vswap();
vpushi(~(((1 << bit_size) - 1) << bit_pos));
gen_op('&');
gen_op('|');
/* store result */
vstore();
} else {
/* bound check case */
if (vtop[-1].r & VT_MUSTBOUND) {
vswap();
gbound();
vswap();
}
rc = RC_INT;
if (is_float(ft))
rc = RC_FLOAT;
r = gv(rc); /* generate value */
/* if lvalue was saved on stack, must read it */
if ((vtop[-1].r & VT_VALMASK) == VT_LLOCAL) {
SValue sv;
t = get_reg(RC_INT);
sv.t = VT_INT;
sv.r = VT_LOCAL | VT_LVAL;
sv.c.ul = vtop[-1].c.ul;
load(t, &sv);
vtop[-1].r = t | VT_LVAL;
}
store(r, vtop - 1);
/* two word case handling : store second register at word + 4 */
if ((ft & VT_BTYPE) == VT_LLONG) {
vswap();
/* convert to int to increment easily */
vtop->t = VT_INT;
gaddrof();
vpushi(4);
gen_op('+');
vtop->r |= VT_LVAL;
vswap();
/* XXX: it works because r2 is spilled last ! */
store(vtop->r2, vtop - 1);
}
vswap();
vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
vtop->r |= delayed_cast;
}
}
/* post defines POST/PRE add. c is the token ++ or -- */
void inc(int post, int c)
{
test_lvalue();
vdup(); /* save lvalue */
if (post) {
gv_dup(); /* duplicate value */
vrotb(3);
vrotb(3);
}
/* add constant */
vpushi(c - TOK_MID);
gen_op('+');
vstore(); /* store value */
if (post)
vpop(); /* if post op, return saved value */
}
/* Parse GNUC __attribute__ extension. Currently, the following
extensions are recognized:
- aligned(n) : set data/function alignment.
- section(x) : generate data/code in this section.
- unused : currently ignored, but may be used someday.
*/
void parse_attribute(AttributeDef *ad)
{
int t, n;
next();
skip('(');
skip('(');
while (tok != ')') {
if (tok < TOK_IDENT)
expect("attribute name");
t = tok;
next();
switch(t) {
case TOK_SECTION:
case TOK___SECTION__:
skip('(');
if (tok != TOK_STR)
expect("section name");
ad->section = find_section(tokc.ts->str);
next();
skip(')');
break;
case TOK_ALIGNED:
case TOK___ALIGNED__:
skip('(');
n = expr_const();
if (n <= 0 || (n & (n - 1)) != 0)
error("alignment must be a positive power of two");
ad->aligned = n;
skip(')');
break;
case TOK_UNUSED:
case TOK___UNUSED__:
/* currently, no need to handle it because tcc does not
track unused objects */
break;
case TOK_NORETURN:
case TOK___NORETURN__:
/* currently, no need to handle it because tcc does not
track unused objects */
break;
case TOK_CDECL:
case TOK___CDECL:
case TOK___CDECL__:
ad->func_call = FUNC_CDECL;
break;
case TOK_STDCALL:
case TOK___STDCALL:
case TOK___STDCALL__:
ad->func_call = FUNC_STDCALL;
break;
default:
warning("'%s' attribute ignored", get_tok_str(t, NULL));
/* skip parameters */
/* XXX: skip parenthesis too */
if (tok == '(') {
next();
while (tok != ')' && tok != -1)
next();
next();
}
break;
}
if (tok != ',')
break;
next();
}
skip(')');
skip(')');
}
/* enum/struct/union declaration */
int struct_decl(int u)
{
int a, t, b, v, size, align, maxalign, c, offset;
int bit_size, bit_pos, bsize, bt, lbit_pos;
Sym *s, *ss, **ps;
AttributeDef ad;
a = tok; /* save decl type */
next();
if (tok != '{') {
v = tok;
next();
/* struct already defined ? return it */
/* XXX: check consistency */
s = sym_find(v | SYM_STRUCT);
if (s) {
if (s->t != a)
error("invalid type");
goto do_decl;
}
} else {
v = anon_sym++;
}
s = sym_push(v | SYM_STRUCT, a, 0, 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;
bit_pos = 0;
offset = 0;
while (1) {
if (a == TOK_ENUM) {
v = tok;
next();
if (tok == '=') {
next();
c = expr_const();
}
/* enum symbols have static storage */
sym_push(v, VT_STATIC | VT_INT, VT_CONST, c);
if (tok == ',')
next();
c++;
} else {
parse_btype(&b, &ad);
while (1) {
bit_size = -1;
v = 0;
if (tok != ':') {
t = type_decl(&ad, &v, b, TYPE_DIRECT);
if ((t & VT_BTYPE) == VT_FUNC ||
(t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN)))
error("invalid type for '%s'",
get_tok_str(v, NULL));
} else {
t = b;
}
if (tok == ':') {
next();
bit_size = expr_const();
/* XXX: handle v = 0 case for messages */
if (bit_size < 0)
error("negative width in bit-field '%s'",
get_tok_str(v, NULL));
if (v && bit_size == 0)
error("zero width for bit-field '%s'",
get_tok_str(v, NULL));
}
size = type_size(t, &align);
lbit_pos = 0;
if (bit_size >= 0) {
bt = t & VT_BTYPE;
if (bt != VT_INT &&
bt != VT_BYTE &&
bt != VT_SHORT)
error("bitfields must have scalar type");
bsize = size * 8;
if (bit_size > bsize) {
error("width of '%s' exceeds its type",
get_tok_str(v, NULL));
} else if (bit_size == bsize) {
/* no need for bit fields */
bit_pos = 0;
} else if (bit_size == 0) {
/* XXX: what to do if only padding in a
structure ? */
/* zero size: means to pad */
if (bit_pos > 0)
bit_pos = bsize;
} else {
/* we do not have enough room ? */
if ((bit_pos + bit_size) > bsize)
bit_pos = 0;
lbit_pos = bit_pos;
/* XXX: handle LSB first */
t |= VT_BITFIELD |
(bit_pos << VT_STRUCT_SHIFT) |
(bit_size << (VT_STRUCT_SHIFT + 6));
bit_pos += bit_size;
}
} else {
bit_pos = 0;
}
if (v) {
/* add new memory data only if starting
bit field */
if (lbit_pos == 0) {
if (a == TOK_STRUCT) {
c = (c + align - 1) & -align;
offset = c;
c += size;
} else {
offset = 0;
if (size > c)
c = size;
}
if (align > maxalign)
maxalign = align;
}
#if 0
printf("add field %s offset=%d",
get_tok_str(v, NULL), offset);
if (t & VT_BITFIELD) {
printf(" pos=%d size=%d",
(t >> VT_STRUCT_SHIFT) & 0x3f,
(t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
}
printf("\n");
#endif
ss = sym_push(v | SYM_FIELD, t, 0, offset);
*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.
*/
int parse_btype(int *type_ptr, AttributeDef *ad)
{
int t, u, type_found;
Sym *s;
memset(ad, 0, sizeof(AttributeDef));
type_found = 0;
t = 0;
while(1) {
switch(tok) {
/* basic types */
case TOK_CHAR:
u = VT_BYTE;
basic_type:
next();
basic_type1:
if ((t & VT_BTYPE) != 0)
error("too many basic types");
t |= u;
break;
case TOK_VOID:
u = VT_VOID;
goto basic_type;
case TOK_SHORT:
u = VT_SHORT;
goto basic_type;
case TOK_INT:
next();
break;
case TOK_LONG:
next();
if ((t & VT_BTYPE) == VT_DOUBLE) {
t = (t & ~VT_BTYPE) | VT_LDOUBLE;
} else if ((t & VT_BTYPE) == VT_LONG) {
t = (t & ~VT_BTYPE) | VT_LLONG;
} else {
u = VT_LONG;
goto basic_type1;
}
break;
case TOK_BOOL:
u = VT_BOOL;
goto basic_type;
case TOK_FLOAT:
u = VT_FLOAT;
goto basic_type;
case TOK_DOUBLE:
next();
if ((t & VT_BTYPE) == VT_LONG) {
t = (t & ~VT_BTYPE) | VT_LDOUBLE;
} else {
u = VT_DOUBLE;
goto basic_type1;
}
break;
case TOK_ENUM:
u = struct_decl(VT_ENUM);
goto basic_type1;
case TOK_STRUCT:
case TOK_UNION:
u = struct_decl(VT_STRUCT);
goto basic_type1;
/* type modifiers */
case TOK_CONST:
case TOK_VOLATILE:
case TOK_REGISTER:
case TOK_SIGNED:
case TOK___SIGNED__:
case TOK_AUTO:
case TOK_INLINE:
case TOK___INLINE__:
case TOK_RESTRICT:
next();
break;
case TOK_UNSIGNED:
t |= VT_UNSIGNED;
next();
break;
/* storage */
case TOK_EXTERN:
t |= VT_EXTERN;
next();
break;
case TOK_STATIC:
t |= VT_STATIC;
next();
break;
case TOK_TYPEDEF:
t |= VT_TYPEDEF;
next();
break;
/* GNUC attribute */
case TOK___ATTRIBUTE__:
parse_attribute(ad);
break;
default:
s = sym_find(tok);
if (!s || !(s->t & VT_TYPEDEF))
goto the_end;
t |= (s->t & ~VT_TYPEDEF);
next();
break;
}
type_found = 1;
}
the_end:
/* long is never used as type */
if ((t & VT_BTYPE) == VT_LONG)
t = (t & ~VT_BTYPE) | VT_INT;
*type_ptr = t;
return type_found;
}
int post_type(int t, AttributeDef *ad)
{
int p, n, pt, l, t1;
Sym **plast, *s, *first;
AttributeDef ad1;
if (tok == '(') {
/* function declaration */
next();
l = 0;
first = NULL;
plast = &first;
while (tok != ')') {
/* read param name and compute offset */
if (l != FUNC_OLD) {
if (!parse_btype(&pt, &ad1)) {
if (l) {
error("invalid type");
} else {
l = FUNC_OLD;
goto old_proto;
}
}
l = FUNC_NEW;
if ((pt & VT_BTYPE) == VT_VOID && tok == ')')
break;
pt = type_decl(&ad1, &n, pt, TYPE_DIRECT | TYPE_ABSTRACT);
if ((pt & VT_BTYPE) == VT_VOID)
error("parameter declared as void");
} 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, 0);
*plast = s;
plast = &s->next;
if (tok == ',') {
next();
if (l == FUNC_NEW && tok == TOK_DOTS) {
l = FUNC_ELLIPSIS;
next();
break;
}
}
}
/* if no parameters, then old type prototype */
if (l == 0)
l = FUNC_OLD;
skip(')');
t1 = t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN);
t = post_type(t & ~(VT_TYPEDEF | VT_STATIC | VT_EXTERN), ad);
/* we push a anonymous symbol which will contain the function prototype */
p = anon_sym++;
s = sym_push(p, t, ad->func_call, l);
s->next = first;
t = t1 | 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 */
t1 = t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN);
t = post_type(t & ~(VT_TYPEDEF | VT_STATIC | VT_EXTERN), ad);
/* we push a anonymous symbol which will contain the array
element type */
p = anon_sym++;
sym_push(p, t, 0, n);
t = t1 | VT_ARRAY | VT_PTR | (p << VT_STRUCT_SHIFT);
}
return t;
}
/* Read a type declaration (except basic type), and return the
type. 'td' is a bitmask indicating which kind of type decl is
expected. 't' should contain the basic type. 'ad' is the attribute
definition of the basic type. It can be modified by type_decl(). */
int type_decl(AttributeDef *ad, int *v, int t, int td)
{
int u, p;
Sym *s;
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();
/* XXX: this is not correct to modify 'ad' at this point, but
the syntax is not clear */
if (tok == TOK___ATTRIBUTE__)
parse_attribute(ad);
u = type_decl(ad, 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, ad);
if (tok == TOK___ATTRIBUTE__)
parse_attribute(ad);
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, int r)
{
Sym *s;
s = sym_find(v);
if (!s) {
/* push forward reference */
s = sym_push1(&global_stack,
v, u, 0);
s->r = r | VT_CONST | VT_FORWARD;
}
return s;
}
void indir(void)
{
if ((vtop->t & VT_BTYPE) != VT_PTR)
expect("pointer");
if (vtop->r & VT_LVAL)
gv(RC_INT);
vtop->t = pointed_type(vtop->t);
/* an array is never an lvalue */
if (!(vtop->t & VT_ARRAY)) {
vtop->r |= VT_LVAL;
/* if bound checking, the referenced pointer must be checked */
if (do_bounds_check)
vtop->r |= VT_MUSTBOUND;
}
}
/* pass a parameter to a function and do type checking and casting */
void gfunc_param_typed(GFuncContext *gf, Sym *func, Sym *arg)
{
int func_type;
func_type = func->c;
if (func_type == FUNC_OLD ||
(func_type == FUNC_ELLIPSIS && arg == NULL)) {
/* default casting : only need to convert float to double */
if ((vtop->t & VT_BTYPE) == VT_FLOAT)
gen_cast(VT_DOUBLE);
} else if (arg == NULL) {
error("too many arguments to function");
} else {
gen_assign_cast(arg->t);
}
gfunc_param(gf);
}
void unary(void)
{
int n, t, ft, fc, p, align, size, r, data_offset;
Sym *s;
GFuncContext gf;
AttributeDef ad;
if (tok == TOK_CINT || tok == TOK_CCHAR || tok == TOK_LCHAR) {
vpushi(tokc.i);
next();
} else if (tok == TOK_CUINT) {
vsetc(VT_INT | VT_UNSIGNED, VT_CONST, &tokc);
next();
} else if (tok == TOK_CLLONG) {
vsetc(VT_LLONG, VT_CONST, &tokc);
next();
} else if (tok == TOK_CULLONG) {
vsetc(VT_LLONG | VT_UNSIGNED, VT_CONST, &tokc);
next();
} else if (tok == TOK_CFLOAT) {
vsetc(VT_FLOAT, VT_CONST, &tokc);
next();
} else if (tok == TOK_CDOUBLE) {
vsetc(VT_DOUBLE, VT_CONST, &tokc);
next();
} else if (tok == TOK_CLDOUBLE) {
vsetc(VT_LDOUBLE, VT_CONST, &tokc);
next();
} else if (tok == TOK___FUNC__) {
/* special function name identifier */
/* generate (char *) type */
data_offset = (int)data_section->data_ptr;
vset(mk_pointer(VT_BYTE), VT_CONST, data_offset);
strcpy((void *)data_offset, funcname);
data_offset += strlen(funcname) + 1;
data_section->data_ptr = (unsigned char *)data_offset;
next();
} 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);
data_offset = (int)data_section->data_ptr;
data_offset = (data_offset + align - 1) & -align;
fc = data_offset;
/* we must declare it as an array first to use initializer parser */
t = VT_ARRAY | mk_pointer(t);
decl_initializer(t, VT_CONST, data_offset, 1, 0);
data_offset += type_size(t, &align);
/* put it as pointer */
vset(t & ~VT_ARRAY, VT_CONST, fc);
data_section->data_ptr = (unsigned char *)data_offset;
} else {
t = tok;
next();
if (t == '(') {
/* cast ? */
if (parse_btype(&t, &ad)) {
ft = type_decl(&ad, &n, t, TYPE_ABSTRACT);
skip(')');
/* check ISOC99 compound literal */
if (tok == '{') {
/* data is allocated locally by default */
if (global_expr)
r = VT_CONST;
else
r = VT_LOCAL;
/* all except arrays are lvalues */
if (!(ft & VT_ARRAY))
r |= VT_LVAL;
memset(&ad, 0, sizeof(AttributeDef));
fc = decl_initializer_alloc(ft, &ad, r, 1);
vset(ft, r, fc);
} else {
unary();
gen_cast(ft);
}
} else {
gexpr();
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 ((vtop->t & VT_BTYPE) != VT_FUNC)
test_lvalue();
vtop->t = mk_pointer(vtop->t);
gaddrof();
} else
if (t == '!') {
unary();
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST)
vtop->c.i = !vtop->c.i;
else if ((vtop->r & VT_VALMASK) == VT_CMP)
vtop->c.i = vtop->c.i ^ 1;
else
vset(VT_INT, VT_JMP, gtst(1, 0));
} else
if (t == '~') {
unary();
vpushi(-1);
gen_op('^');
} else
if (t == '+') {
unary();
} else
if (t == TOK_SIZEOF) {
if (tok == '(') {
next();
if (parse_btype(&t, &ad)) {
t = type_decl(&ad, &n, t, TYPE_ABSTRACT);
} else {
/* XXX: some code could be generated: add eval
flag */
gexpr();
t = vtop->t;
vpop();
}
skip(')');
} else {
unary();
t = vtop->t;
vpop();
}
vpushi(type_size(t, &t));
} else
if (t == TOK_INC || t == TOK_DEC) {
unary();
inc(0, t);
} else if (t == '-') {
vpushi(0);
unary();
gen_op('-');
} else
{
s = sym_find(t);
if (!s) {
if (tok != '(')
error("'%s' undeclared", get_tok_str(t, NULL));
/* 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), 0);
}
vset(s->t, s->r, s->c);
/* if forward reference, we must point to s */
if (vtop->r & VT_FORWARD)
vtop->c.sym = 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();
gaddrof();
next();
/* expect pointer on structure */
if ((vtop->t & VT_BTYPE) != VT_STRUCT)
expect("struct or union");
s = sym_find(((unsigned)vtop->t >> VT_STRUCT_SHIFT) | SYM_STRUCT);
/* find field */
tok |= SYM_FIELD;
while ((s = s->next) != NULL) {
if (s->v == tok)
break;
}
if (!s)
error("field not found");
/* add field offset to pointer */
vtop->t = char_pointer_type; /* change type to 'char *' */
vpushi(s->c);
gen_op('+');
/* change type to field type, and set to lvalue */
vtop->t = s->t;
/* an array is never an lvalue */
if (!(vtop->t & VT_ARRAY))
vtop->r |= VT_LVAL;
next();
} else if (tok == '[') {
next();
gexpr();
gen_op('+');
indir();
skip(']');
} else if (tok == '(') {
SValue ret;
Sym *sa;
/* function call */
if ((vtop->t & VT_BTYPE) != VT_FUNC) {
/* pointer test (no array accepted) */
if ((vtop->t & (VT_BTYPE | VT_ARRAY)) == VT_PTR) {
vtop->t = pointed_type(vtop->t);
if ((vtop->t & VT_BTYPE) != VT_FUNC)
goto error_func;
} else {
error_func:
expect("function pointer");
}
} else {
vtop->r &= ~VT_LVAL; /* no lvalue */
}
/* get return type */
s = sym_find((unsigned)vtop->t >> VT_STRUCT_SHIFT);
save_regs(); /* save used temporary registers */
gfunc_start(&gf, s->r);
next();
sa = s->next; /* first parameter */
#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);
s1 = sym_push2(&args, 0, 0, (int)str);
s1->next = sa; /* add reference to argument */
if (sa)
sa = sa->next;
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();
if (tok != -1)
expect("',' or ')'");
gfunc_param_typed(&gf, s, args->next);
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_BTYPE) == VT_STRUCT) {
/* get some space for the returned structure */
size = type_size(s->t, &align);
loc = (loc - size) & -align;
ret.t = s->t;
ret.r = VT_LOCAL | VT_LVAL;
/* pass it as 'int' to avoid structure arg passing
problems */
vset(VT_INT, VT_LOCAL, loc);
ret.c = vtop->c;
gfunc_param(&gf);
} else {
ret.t = s->t;
ret.r2 = VT_CONST;
/* return in register */
if (is_float(ret.t)) {
ret.r = REG_FRET;
} else {
if ((ret.t & VT_BTYPE) == VT_LLONG)
ret.r2 = REG_LRET;
ret.r = REG_IRET;
}
ret.c.i = 0;
}
#ifndef INVERT_FUNC_PARAMS
while (tok != ')') {
expr_eq();
gfunc_param_typed(&gf, s, sa);
if (sa)
sa = sa->next;
if (tok == ',')
next();
}
#endif
if (sa)
error("too few arguments to function");
skip(')');
gfunc_call(&gf);
/* return value */
vsetc(ret.t, ret.r, &ret.c);
vtop->r2 = ret.r2;
} else {
break;
}
}
}
void uneq(void)
{
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();
t = tok;
next();
if (t == '=') {
expr_eq();
} else {
vdup();
expr_eq();
gen_op(t & 0x7f);
}
vstore();
}
}
void sum(int 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)) {
t = tok;
next();
sum(l);
gen_op(t);
}
}
}
/* only used if non constant */
void eand(void)
{
int t;
sum(8);
t = 0;
while (1) {
if (tok != TOK_LAND) {
if (t) {
t = gtst(1, t);
vset(VT_INT, VT_JMPI, t);
}
break;
}
t = gtst(1, t);
next();
sum(8);
}
}
void eor(void)
{
int t;
eand();
t = 0;
while (1) {
if (tok != TOK_LOR) {
if (t) {
t = gtst(0, t);
vset(VT_INT, VT_JMP, t);
}
break;
}
t = gtst(0, t);
next();
eand();
}
}
/* XXX: better constant handling */
void expr_eq(void)
{
int t, u, c, r1, r2, rc;
if (const_wanted) {
sum(10);
if (tok == '?') {
c = vtop->c.i;
vpop();
next();
gexpr();
t = vtop->c.i;
vpop();
skip(':');
expr_eq();
if (c)
vtop->c.i = t;
}
} else {
eor();
if (tok == '?') {
next();
t = gtst(1, 0);
gexpr();
/* XXX: long long handling ? */
rc = RC_INT;
if (is_float(vtop->t))
rc = RC_FLOAT;
r1 = gv(rc);
vtop--; /* no vpop so that FP stack is not flushed */
skip(':');
u = gjmp(0);
gsym(t);
expr_eq();
r2 = gv(rc);
move_reg(r1, r2);
vtop->r = r1;
gsym(u);
}
}
}
void gexpr(void)
{
while (1) {
expr_eq();
if (tok != ',')
break;
vpop();
next();
}
}
/* parse a constant expression and return value in vtop */
void expr_const1(void)
{
int a;
a = const_wanted;
const_wanted = 1;
expr_eq();
if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
expect("constant");
const_wanted = a;
}
/* parse an integer constant and return its value */
int expr_const(void)
{
int c;
expr_const1();
c = vtop->c.i;
vpop();
return c;
}
/* return the label token if current token is a label, otherwise
return zero */
int is_label(void)
{
int t;
CValue c;
/* fast test first */
if (tok < TOK_UIDENT)
return 0;
/* no need to save tokc since we expect an identifier */
t = tok;
c = tokc;
next();
if (tok == ':') {
next();
return t;
} else {
/* XXX: may not work in all cases (macros ?) */
tok1 = tok;
tok1c = tokc;
tok = t;
tokc = c;
return 0;
}
}
void block(int *bsym, int *csym, int *case_sym, int *def_sym, int case_reg)
{
int a, b, c, d;
Sym *s;
/* generate line number info */
if (do_debug &&
(last_line_num != file->line_num || last_ind != ind)) {
put_stabn(N_SLINE, 0, file->line_num, ind - func_ind);
last_ind = ind;
last_line_num = file->line_num;
}
if (tok == TOK_IF) {
/* if test */
next();
skip('(');
gexpr();
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('(');
gexpr();
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 != ';') {
gexpr();
gen_assign_cast(func_vt);
if ((func_vt & VT_BTYPE) == 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();
vswap();
/* copy structure value to pointer */
vstore();
} else if (is_float(func_vt)) {
gv(RC_FRET);
} else {
gv(RC_IRET);
}
vtop--; /* NOT vpop() because on x86 it would flush the fp stack */
}
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 != ';') {
gexpr();
vpop();
}
skip(';');
d = ind;
c = ind;
a = 0;
b = 0;
if (tok != ';') {
gexpr();
a = gtst(1, 0);
}
skip(';');
if (tok != ')') {
e = gjmp(0);
c = ind;
gexpr();
vpop();
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);
gexpr();
c = gtst(0, 0);
gsym_addr(c, d);
skip(')');
gsym(a);
skip(';');
} else
if (tok == TOK_SWITCH) {
next();
skip('(');
gexpr();
/* XXX: other types than integer */
case_reg = gv(RC_INT);
vpop();
skip(')');
a = 0;
b = gjmp(0); /* jump to first case */
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) {
int v1, v2;
if (!case_sym)
expect("switch");
next();
v1 = expr_const();
v2 = v1;
if (gnu_ext && tok == TOK_DOTS) {
next();
v2 = expr_const();
if (v2 < v1)
warning("empty case range");
}
/* since a case is like a label, we must skip it with a jmp */
b = gjmp(0);
gsym(*case_sym);
vset(VT_INT, case_reg, 0);
vpushi(v1);
if (v1 == v2) {
gen_op(TOK_EQ);
*case_sym = gtst(1, 0);
} else {
gen_op(TOK_GE);
*case_sym = gtst(1, 0);
vset(VT_INT, case_reg, 0);
vpushi(v2);
gen_op(TOK_LE);
*case_sym = gtst(1, *case_sym);
}
gsym(b);
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 = is_label();
if (b) {
/* 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);
}
/* we accept this, but it is a mistake */
if (tok == '}')
warning("deprecated use of label at end of compound statement");
else
block(bsym, csym, case_sym, def_sym, case_reg);
} else {
/* expression case */
if (tok != ';') {
gexpr();
vpop();
}
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 r, int c,
int *cur_index, Sym **cur_field,
int size_only)
{
Sym *s, *f;
int notfirst, index, align, l;
notfirst = 0;
if (gnu_ext && (l = is_label()) != 0)
goto struct_field;
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 {
next();
l = tok;
next();
struct_field:
if ((t & VT_BTYPE) != VT_STRUCT)
expect("struct/union type");
s = sym_find(((unsigned)t >> VT_STRUCT_SHIFT) | SYM_STRUCT);
l |= SYM_FIELD;
f = s->next;
while (f) {
if (f->v == l)
break;
f = f->next;
}
if (!f)
expect("field");
if (!notfirst)
*cur_field = f;
t = f->t | (t & ~VT_TYPE);
c += f->c;
}
notfirst = 1;
}
if (notfirst) {
if (tok == '=') {
next();
} else {
if (!gnu_ext)
expect("=");
}
} 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_TYPE);
c += f->c;
}
}
decl_initializer(t, r, c, 0, size_only);
}
#define EXPR_VAL 0
#define EXPR_CONST 1
#define EXPR_ANY 2
/* store a value or an expression directly in global data or in local array */
void init_putv(int t, int r, int c,
int v, int expr_type)
{
int saved_global_expr, bt;
switch(expr_type) {
case EXPR_VAL:
vpushi(v);
break;
case EXPR_CONST:
/* compound literals must be allocated globally in this case */
saved_global_expr = global_expr;
global_expr = 1;
expr_const1();
global_expr = saved_global_expr;
break;
case EXPR_ANY:
expr_eq();
break;
}
if ((r & VT_VALMASK) == VT_CONST) {
/* XXX: not portable */
gen_assign_cast(t);
bt = t & VT_BTYPE;
switch(bt) {
case VT_BYTE:
*(char *)c = vtop->c.i;
break;
case VT_SHORT:
*(short *)c = vtop->c.i;
break;
case VT_DOUBLE:
*(double *)c = vtop->c.d;
break;
case VT_LDOUBLE:
*(long double *)c = vtop->c.ld;
break;
case VT_LLONG:
*(long long *)c = vtop->c.ll;
break;
default:
*(int *)c = vtop->c.i;
break;
}
vtop--;
} else {
vset(t, r, c);
vswap();
vstore();
vpop();
}
}
/* put zeros for variable based init */
void init_putz(int t, int r, int c, int size)
{
GFuncContext gf;
if ((r & VT_VALMASK) == VT_CONST) {
/* nothing to do because globals are already set to zero */
} else {
gfunc_start(&gf, FUNC_CDECL);
vpushi(size);
gfunc_param(&gf);
vpushi(0);
gfunc_param(&gf);
vset(VT_INT, VT_LOCAL, c);
gfunc_param(&gf);
vpushi((int)&memset);
gfunc_call(&gf);
}
}
/* '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 r, int c, int first, int size_only)
{
int index, array_length, n, no_oblock, nb, parlevel, i;
int t1, size1, align1, expr_type;
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_BTYPE) == VT_INT) ||
(tok == TOK_STR &&
(t1 & VT_BTYPE) == VT_BYTE)) {
/* XXX: move multiple string parsing in parser ? */
while (tok == TOK_STR || tok == TOK_LSTR) {
ts = tokc.ts;
/* 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, r, c + (array_length + i) * size1,
ts->str[i], EXPR_VAL);
}
}
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, r, c + (array_length * size1), 0, EXPR_VAL);
}
array_length++;
}
} else {
index = 0;
while (tok != '}') {
decl_designator(t, r, 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, r, 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, r, c + array_length * size1,
(n - array_length) * size1);
}
/* patch type size if needed */
if (n < 0)
s->c = array_length;
} else if ((t & VT_BTYPE) == 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, r, c, NULL, &f, size_only);
/* fill with zero between fields */
index = f->c;
if (!size_only && array_length < index) {
init_putz(t, r, 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, r, c + array_length,
n - array_length);
}
skip('}');
} else if (tok == '{') {
next();
decl_initializer(t, r, 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 {
/* currently, we always use constant expression for globals
(may change for scripting case) */
expr_type = EXPR_CONST;
if ((r & VT_VALMASK) == VT_LOCAL)
expr_type = EXPR_ANY;
init_putv(t, r, c, 0, expr_type);
}
}
/* parse an initializer for type 't' if 'has_init' is true, and
allocate space in local or global data space ('r' is either
VT_LOCAL or VT_CONST). The allocated address in returned */
int decl_initializer_alloc(int t, AttributeDef *ad, int r, int has_init)
{
int size, align, addr, tok1, data_offset;
int *init_str, init_len, level, *saved_macro_ptr;
Section *sec;
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("unexpected 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, r, 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");
}
/* take into account specified alignment if bigger */
if (ad->aligned > align)
align = ad->aligned;
if ((r & VT_VALMASK) == VT_LOCAL) {
if (do_bounds_check && (t & VT_ARRAY))
loc--;
loc = (loc - size) & -align;
addr = loc;
/* handles bounds */
/* XXX: currently, since we do only one pass, we cannot track
'&' operators, so we add only arrays */
if (do_bounds_check && (t & VT_ARRAY)) {
int *bounds_ptr;
/* add padding between regions */
loc--;
/* then add local bound info */
bounds_ptr = (int *)lbounds_section->data_ptr;
*bounds_ptr++ = addr;
*bounds_ptr++ = size;
lbounds_section->data_ptr = (unsigned char *)bounds_ptr;
}
} else {
/* compute section */
sec = ad->section;
if (!sec) {
if (has_init)
sec = data_section;
else
sec = bss_section;
}
data_offset = (int)sec->data_ptr;
data_offset = (data_offset + align - 1) & -align;
addr = data_offset;
/* very important to increment global
pointer at this time because
initializers themselves can create new
initializers */
data_offset += size;
/* handles bounds */
if (do_bounds_check) {
int *bounds_ptr;
/* first, we need to add at least one byte between each region */
data_offset++;
/* then add global bound info */
bounds_ptr = (int *)bounds_section->data_ptr;
*bounds_ptr++ = addr;
*bounds_ptr++ = size;
bounds_section->data_ptr = (unsigned char *)bounds_ptr;
}
sec->data_ptr = (unsigned char *)data_offset;
}
if (has_init) {
decl_initializer(t, r, addr, 1, 0);
/* restore parse state if needed */
if (init_str) {
free(init_str);
macro_ptr = saved_macro_ptr;
tok = tok1;
}
}
return addr;
}
void put_func_debug(int t)
{
int bind;
char buf[512];
if (t & VT_STATIC)
bind = STB_LOCAL;
else
bind = STB_GLOBAL;
put_elf_sym(symtab_section, ind, 0,
ELF32_ST_INFO(bind, STT_FUNC), 0,
cur_text_section->sh_num, funcname);
/* stabs info */
/* XXX: we put here a dummy type */
snprintf(buf, sizeof(buf), "%s:%c1",
funcname, t & VT_STATIC ? 'f' : 'F');
put_stabs(buf, N_FUN, 0, file->line_num, ind);
func_ind = ind;
last_ind = 0;
last_line_num = 0;
}
/* 'l' is VT_LOCAL or VT_CONST to define default storage type */
void decl(int l)
{
int t, b, v, addr, has_init, r;
Sym *sym;
AttributeDef ad;
while (1) {
if (!parse_btype(&b, &ad)) {
/* 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_BTYPE) == VT_ENUM ||
(b & VT_BTYPE) == VT_STRUCT) &&
tok == ';') {
/* we accept no variable after */
next();
continue;
}
while (1) { /* iterate thru each declaration */
t = type_decl(&ad, &v, b, TYPE_DIRECT);
#if 0
{
char buf[500];
type_to_str(buf, sizeof(buf), t, get_tok_str(v, NULL));
printf("type = '%s'\n", buf);
}
#endif
if (tok == '{') {
if (l == VT_LOCAL)
error("cannot use local functions");
if (!(t & VT_FUNC))
expect("function definition");
/* compute text section */
cur_text_section = ad.section;
if (!cur_text_section)
cur_text_section = text_section;
ind = (int)cur_text_section->data_ptr;
/* patch forward references */
if ((sym = sym_find(v)) && (sym->r & VT_FORWARD)) {
greloc_patch(sym, ind);
sym->t = t;
} else {
/* put function address */
sym = sym_push1(&global_stack, v, t, ind);
}
sym->r = VT_CONST;
funcname = get_tok_str(v, NULL);
/* put debug symbol */
if (do_debug)
put_func_debug(t);
/* push a dummy symbol to enable local sym storage */
sym_push1(&local_stack, 0, 0, 0);
gfunc_prolog(t);
loc = 0;
rsym = 0;
block(NULL, NULL, NULL, NULL, 0);
gsym(rsym);
gfunc_epilog();
cur_text_section->data_ptr = (unsigned char *)ind;
sym_pop(&label_stack, NULL); /* reset label stack */
sym_pop(&local_stack, NULL); /* reset local stack */
/* end of function */
if (do_debug) {
put_stabn(N_FUN, 0, 0, ind - func_ind);
}
funcname = ""; /* for safety */
func_vt = VT_VOID; /* for safety */
ind = 0; /* for safety */
break;
} else {
if (b & VT_TYPEDEF) {
/* save typedefed type */
/* XXX: test storage specifiers ? */
sym_push(v, t | VT_TYPEDEF, 0, 0);
} else if ((t & VT_BTYPE) == VT_FUNC) {
/* external function definition */
external_sym(v, t, 0);
} else {
/* not lvalue if array */
r = 0;
if (!(t & VT_ARRAY))
r |= VT_LVAL;
if (b & VT_EXTERN) {
/* external variable */
external_sym(v, t, r);
} else {
if (t & VT_STATIC)
r |= VT_CONST;
else
r |= l;
has_init = (tok == '=');
if (has_init)
next();
addr = decl_initializer_alloc(t, &ad, r,
has_init);
if (l == VT_CONST) {
/* global scope: see if already defined */
sym = sym_find(v);
if (!sym)
goto do_def;
if (!is_compatible_types(sym->t, t))
error("incompatible types for redefinition of '%s'",
get_tok_str(v, NULL));
if (!(sym->r & VT_FORWARD))
error("redefinition of '%s'", get_tok_str(v, NULL));
greloc_patch(sym, addr);
} else {
do_def:
sym_push(v, t, r, addr);
}
}
}
if (tok != ',') {
skip(';');
break;
}
next();
}
}
}
}
/* put all global symbols in the extern stack and do all the
resolving which can be done without using external symbols from DLLs */
/* XXX: could try to verify types, but would not to save them in
extern_stack too */
void resolve_global_syms(void)
{
Sym *s, *s1, *ext_sym;
Reloc **p;
s = global_stack.top;
while (s != NULL) {
s1 = s->prev;
/* do not save static or typedefed symbols or types */
if (!(s->t & (VT_STATIC | VT_TYPEDEF)) &&
!(s->v & (SYM_FIELD | SYM_STRUCT)) &&
(s->v < SYM_FIRST_ANOM)) {
ext_sym = sym_find1(&extern_stack, s->v);
if (!ext_sym) {
/* if the symbol do not exist, we simply save it */
ext_sym = sym_push1(&extern_stack, s->v, s->t, s->c);
ext_sym->r = s->r;
} else if (ext_sym->r & VT_FORWARD) {
/* external symbol already exists, but only as forward
definition */
if (!(s->r & VT_FORWARD)) {
/* s is not forward, so we can relocate all symbols */
greloc_patch(ext_sym, s->c);
} else {
/* the two symbols are forward: merge them */
p = (Reloc **)&ext_sym->c;
while (*p != NULL)
p = &(*p)->next;
*p = (Reloc *)s->c;
}
} else {
/* external symbol already exists and is defined :
patch all references to it */
if (!(s->r & VT_FORWARD))
error("'%s' defined twice", get_tok_str(s->v, NULL));
greloc_patch(s, ext_sym->c);
}
}
s = s1;
}
}
/* compile a C file. Return non zero if errors. */
int tcc_compile_file(const char *filename1)
{
Sym *define_start;
char buf[512];
funcname = "";
file = tcc_open(filename1);
if (!file)
error("file '%s' not found", filename1);
include_stack_ptr = include_stack;
ifdef_stack_ptr = ifdef_stack;
vtop = vstack - 1;
anon_sym = SYM_FIRST_ANOM;
/* file info: full path + filename */
if (do_debug) {
getcwd(buf, sizeof(buf));
pstrcat(buf, sizeof(buf), "/");
put_stabs(buf, N_SO, 0, 0, (unsigned long)text_section->data_ptr);
put_stabs(file->filename, N_SO, 0, 0,
(unsigned long)text_section->data_ptr);
}
/* define common 'char *' type because it is often used internally
for arrays and struct dereference */
char_pointer_type = mk_pointer(VT_BYTE);
define_start = define_stack.top;
inp();
ch = '\n'; /* needed to parse correctly first preprocessor command */
next();
decl(VT_CONST);
if (tok != -1)
expect("declaration");
tcc_close(file);
/* end of translation unit info */
if (do_debug) {
put_stabn(N_SO, 0, 0, (unsigned long)text_section->data_ptr);
}
/* reset define stack, but leave -Dsymbols (may be incorrect if
they are undefined) */
sym_pop(&define_stack, define_start);
resolve_global_syms();
sym_pop(&global_stack, NULL);
return 0;
}
/* define a symbol. A value can also be provided with the '=' operator */
/* XXX: currently only handles integers and string defines. should use
tcc parser, but would need a custom 'FILE *' */
void define_symbol(const char *sym)
{
char *p;
BufferedFile bf1, *bf = &bf1;
pstrcpy(bf->buffer, IO_BUF_SIZE, sym);
p = strchr(bf->buffer, '=');
if (!p) {
/* default value */
pstrcat(bf->buffer, IO_BUF_SIZE, " 1");
} else {
*p = ' ';
}
/* init file structure */
bf->fd = -1;
bf->buf_ptr = bf->buffer;
bf->buf_end = bf->buffer + strlen(bf->buffer);
bf->filename[0] = '\0';
bf->line_num = 1;
file = bf;
include_stack_ptr = include_stack;
/* parse with define parser */
inp();
ch = '\n'; /* needed to parse correctly first preprocessor command */
next_nomacro();
parse_define();
file = NULL;
}
void undef_symbol(const char *sym)
{
TokenSym *ts;
Sym *s;
ts = tok_alloc(sym, 0);
s = sym_find1(&define_stack, tok);
/* undefine symbol by putting an invalid name */
if (s)
sym_undef(&define_stack, s);
}
/* 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());
}
static void *resolve_sym(const char *sym)
{
void *ptr;
if (do_bounds_check) {
ptr = bound_resolve_sym(sym);
if (ptr)
return ptr;
}
return dlsym(NULL, sym);
}
void resolve_extern_syms(void)
{
Sym *s, *s1;
char *str;
int addr;
s = extern_stack.top;
while (s != NULL) {
s1 = s->prev;
if (s->r & 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, NULL);
addr = (int)resolve_sym(str);
if (!addr)
error("unresolved external reference '%s'", str);
greloc_patch(s, addr);
}
}
s = s1;
}
}
static int put_elf_str(Section *s, const char *sym)
{
int c, offset;
offset = s->data_ptr - s->data;
for(;;) {
c = *sym++;
*s->data_ptr++ = c;
if (c == '\0')
break;
}
return offset;
}
static void put_elf_sym(Section *s,
unsigned long value, unsigned long size,
int info, int other, int shndx, const char *name)
{
int name_offset;
Elf32_Sym *sym;
sym = (Elf32_Sym *)s->data_ptr;
if (name)
name_offset = put_elf_str(s->link, name);
else
name_offset = 0;
sym->st_name = name_offset;
sym->st_value = value;
sym->st_size = size;
sym->st_info = info;
sym->st_other = other;
sym->st_shndx = shndx;
s->data_ptr += sizeof(Elf32_Sym);
}
/* put stab debug information */
typedef struct {
unsigned long n_strx; /* index into string table of name */
unsigned char n_type; /* type of symbol */
unsigned char n_other; /* misc info (usually empty) */
unsigned short n_desc; /* description field */
unsigned long n_value; /* value of symbol */
} Stab_Sym;
static void put_stabs(const char *str, int type, int other, int desc, int value)
{
Stab_Sym *sym;
sym = (Stab_Sym *)stab_section->data_ptr;
if (str) {
sym->n_strx = put_elf_str(stabstr_section, str);
} else {
sym->n_strx = 0;
}
sym->n_type = type;
sym->n_other = other;
sym->n_desc = desc;
sym->n_value = value;
stab_section->data_ptr += sizeof(Stab_Sym);
}
static void put_stabn(int type, int other, int desc, int value)
{
put_stabs(NULL, type, other, desc, value);
}
static void put_stabd(int type, int other, int desc)
{
put_stabs(NULL, type, other, desc, 0);
}
/* output an ELF file (currently, only for testing) */
/* XXX: generate dynamic reloc info + DLL tables */
/* XXX: generate startup code */
/* XXX: better program header generation */
/* XXX: handle realloc'ed sections (instead of mmaping them) */
void build_exe(char *filename)
{
Elf32_Ehdr ehdr;
FILE *f;
int shnum, i, phnum, file_offset, offset, size, j;
Section *sec, *strsec;
Elf32_Shdr *shdr, *sh;
Elf32_Phdr *phdr, *ph;
memset(&ehdr, 0, sizeof(ehdr));
/* we add a section for symbols */
strsec = new_section(".shstrtab", SHT_STRTAB, 0);
put_elf_str(strsec, "");
/* count number of sections and compute number of program segments */
shnum = 1; /* section index zero is reserved */
phnum = 0;
for(sec = first_section; sec != NULL; sec = sec->next) {
shnum++;
if (sec->sh_flags & SHF_ALLOC)
phnum++;
}
/* allocate section headers */
shdr = malloc(shnum * sizeof(Elf32_Shdr));
if (!shdr)
error("memory full");
memset(shdr, 0, shnum * sizeof(Elf32_Shdr));
/* allocate program segment headers */
phdr = malloc(phnum * sizeof(Elf32_Phdr));
if (!phdr)
error("memory full");
memset(phdr, 0, phnum * sizeof(Elf32_Phdr));
/* XXX: find correct load order */
file_offset = sizeof(Elf32_Ehdr) + phnum * sizeof(Elf32_Phdr);
for(sec = first_section, i = 1; sec != NULL; sec = sec->next, i++) {
sh = &shdr[i];
sh->sh_name = put_elf_str(strsec, sec->name);
sh->sh_type = sec->sh_type;
sh->sh_flags = sec->sh_flags;
sh->sh_entsize = sec->sh_entsize;
if (sec->link)
sh->sh_link = sec->link->sh_num;
if (sh->sh_type == SHT_STRTAB) {
sh->sh_addralign = 1;
} else if (sh->sh_type == SHT_SYMTAB ||
(sh->sh_flags & SHF_ALLOC) == 0) {
sh->sh_addralign = 4;
} else {
sh->sh_addr = (Elf32_Word)sec->data;
sh->sh_addralign = 4096;
}
sh->sh_size = (Elf32_Word)sec->data_ptr - (Elf32_Word)sec->data;
/* align to section start */
file_offset = (file_offset + sh->sh_addralign - 1) &
~(sh->sh_addralign - 1);
sh->sh_offset = file_offset;
file_offset += sh->sh_size;
}
/* build program headers (simplistic - not fully correct) */
j = 0;
for(i=1;i<shnum;i++) {
sh = &shdr[i];
if (sh->sh_type == SHT_PROGBITS &&
(sh->sh_flags & SHF_ALLOC) != 0) {
ph = &phdr[j++];
ph->p_type = PT_LOAD;
ph->p_offset = sh->sh_offset;
ph->p_vaddr = sh->sh_addr;
ph->p_paddr = ph->p_vaddr;
ph->p_filesz = sh->sh_size;
ph->p_memsz = sh->sh_size;
ph->p_flags = PF_R;
if (sh->sh_flags & SHF_WRITE)
ph->p_flags |= PF_W;
if (sh->sh_flags & SHF_EXECINSTR)
ph->p_flags |= PF_X;
ph->p_align = sh->sh_addralign;
}
}
/* align to 4 */
file_offset = (file_offset + 3) & -4;
/* fill header */
ehdr.e_ident[0] = ELFMAG0;
ehdr.e_ident[1] = ELFMAG1;
ehdr.e_ident[2] = ELFMAG2;
ehdr.e_ident[3] = ELFMAG3;
ehdr.e_ident[4] = ELFCLASS32;
ehdr.e_ident[5] = ELFDATA2LSB;
ehdr.e_ident[6] = EV_CURRENT;
ehdr.e_type = ET_EXEC;
ehdr.e_machine = EM_386;
ehdr.e_version = EV_CURRENT;
ehdr.e_entry = 0; /* XXX: patch it */
ehdr.e_phoff = sizeof(Elf32_Ehdr);
ehdr.e_shoff = file_offset;
ehdr.e_ehsize = sizeof(Elf32_Ehdr);
ehdr.e_phentsize = sizeof(Elf32_Phdr);
ehdr.e_phnum = phnum;
ehdr.e_shentsize = sizeof(Elf32_Shdr);
ehdr.e_shnum = shnum;
ehdr.e_shstrndx = shnum - 1;
/* write elf file */
f = fopen(filename, "w");
if (!f)
error("could not write '%s'", filename);
fwrite(&ehdr, 1, sizeof(Elf32_Ehdr), f);
fwrite(phdr, 1, phnum * sizeof(Elf32_Phdr), f);
offset = sizeof(Elf32_Ehdr) + phnum * sizeof(Elf32_Phdr);
for(sec = first_section, i = 1; sec != NULL; sec = sec->next, i++) {
sh = &shdr[i];
while (offset < sh->sh_offset) {
fputc(0, f);
offset++;
}
size = sec->data_ptr - sec->data;
fwrite(sec->data, 1, size, f);
offset += size;
}
while (offset < ehdr.e_shoff) {
fputc(0, f);
offset++;
}
fwrite(shdr, 1, shnum * sizeof(Elf32_Shdr), f);
fclose(f);
}
/* print the position in the source file of PC value 'pc' by reading
the stabs debug information */
static void rt_printline(unsigned long wanted_pc)
{
Stab_Sym *sym, *sym_end;
char func_name[128];
unsigned long func_addr, last_pc, pc;
const char *incl_files[INCLUDE_STACK_SIZE];
int incl_index, len, last_line_num, i;
const char *str, *p;
func_name[0] = '\0';
func_addr = 0;
incl_index = 0;
last_pc = 0xffffffff;
last_line_num = 1;
sym = (Stab_Sym *)stab_section->data + 1;
sym_end = (Stab_Sym *)stab_section->data_ptr;
while (sym < sym_end) {
switch(sym->n_type) {
/* function start or end */
case N_FUN:
if (sym->n_strx == 0) {
func_name[0] = '\0';
func_addr = 0;
} else {
str = stabstr_section->data + sym->n_strx;
p = strchr(str, ':');
if (!p) {
pstrcpy(func_name, sizeof(func_name), str);
} else {
len = p - str;
if (len > sizeof(func_name) - 1)
len = sizeof(func_name) - 1;
memcpy(func_name, str, len);
func_name[len] = '\0';
}
func_addr = sym->n_value;
}
break;
/* line number info */
case N_SLINE:
pc = sym->n_value + func_addr;
if (wanted_pc >= last_pc && wanted_pc < pc)
goto found;
last_pc = pc;
last_line_num = sym->n_desc;
break;
/* include files */
case N_BINCL:
str = stabstr_section->data + sym->n_strx;
add_incl:
if (incl_index < INCLUDE_STACK_SIZE) {
incl_files[incl_index++] = str;
}
break;
case N_EINCL:
if (incl_index > 1)
incl_index--;
break;
case N_SO:
if (sym->n_strx == 0) {
incl_index = 0; /* end of translation unit */
} else {
str = stabstr_section->data + sym->n_strx;
/* do not add path */
len = strlen(str);
if (len > 0 && str[len - 1] != '/')
goto add_incl;
}
break;
}
sym++;
}
/* did not find line number info: */
fprintf(stderr, "(no debug info, pc=0x%08lx): ", wanted_pc);
return;
found:
for(i = 0; i < incl_index - 1; i++)
fprintf(stderr, "In file included from %s\n",
incl_files[i]);
if (incl_index > 0) {
fprintf(stderr, "%s:%d: ",
incl_files[incl_index - 1], last_line_num);
}
if (func_name[0] != '\0') {
fprintf(stderr, "in function '%s()': ", func_name);
}
}
/* emit a run time error at position 'pc' */
void rt_error(unsigned long pc, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
rt_printline(pc);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
exit(255);
va_end(ap);
}
#ifndef WIN32
/* signal handler for fatal errors */
static void sig_error(int signum, siginfo_t *siginf, void *puc)
{
struct ucontext *uc = puc;
unsigned long pc;
#ifdef __i386__
pc = uc->uc_mcontext.gregs[14];
#else
#error please put the right sigcontext field
#endif
switch(signum) {
case SIGFPE:
switch(siginf->si_code) {
case FPE_INTDIV:
case FPE_FLTDIV:
rt_error(pc, "division by zero");
break;
default:
rt_error(pc, "floating point exception");
break;
}
break;
case SIGBUS:
case SIGSEGV:
rt_error(pc, "dereferencing invalid pointer");
break;
case SIGILL:
rt_error(pc, "illegal instruction");
break;
case SIGABRT:
rt_error(pc, "abort() called");
break;
default:
rt_error(pc, "caught signal %d", signum);
break;
}
exit(255);
}
#endif
/* launch the compiled program with the given arguments */
int launch_exe(int argc, char **argv)
{
Sym *s;
int (*t)();
s = sym_find1(&extern_stack, TOK_MAIN);
if (!s || (s->r & VT_FORWARD))
error("main() not defined");
if (do_debug) {
#ifdef WIN32
error("debug mode currently not available for Windows");
#else
struct sigaction sigact;
/* install TCC signal handlers to print debug info on fatal
runtime errors */
sigact.sa_flags = SA_SIGINFO | SA_ONESHOT;
sigact.sa_sigaction = sig_error;
sigemptyset(&sigact.sa_mask);
sigaction(SIGFPE, &sigact, NULL);
sigaction(SIGILL, &sigact, NULL);
sigaction(SIGSEGV, &sigact, NULL);
sigaction(SIGBUS, &sigact, NULL);
sigaction(SIGABRT, &sigact, NULL);
#endif
}
if (do_bounds_check) {
#ifdef WIN32
error("bound checking currently not available for Windows");
#else
int *p, *p_end;
__bound_init();
/* add all known static regions */
p = (int *)bounds_section->data;
p_end = (int *)bounds_section->data_ptr;
while (p < p_end) {
__bound_new_region((void *)p[0], p[1]);
p += 2;
}
#endif
}
t = (int (*)())s->c;
return (*t)(argc, argv);
}
void help(void)
{
printf("tcc version 0.9.4 - Tiny C Compiler - Copyright (C) 2001, 2002 Fabrice Bellard\n"
"usage: tcc [-Idir] [-Dsym[=val]] [-Usym] [-llib] [-g] [-b]\n"
" [-i infile] infile [infile_args...]\n"
"\n"
"-Idir : add include path 'dir'\n"
"-Dsym[=val] : define 'sym' with value 'val'\n"
"-Usym : undefine 'sym'\n"
"-llib : link with dynamic library 'lib'\n"
"-g : generate runtime debug info\n"
"-b : compile with built-in memory and bounds checker (implies -g)\n"
"-i infile : compile infile\n"
);
}
int main(int argc, char **argv)
{
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 = tcc_keywords;
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
/* tiny C specific defines */
define_symbol("__TINYC__");
/* create standard sections */
text_section = new_section(".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
data_section = new_section(".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
/* XXX: should change type to SHT_NOBITS */
bss_section = new_section(".bss", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
optind = 1;
outfile = NULL;
while (1) {
if (optind >= argc) {
show_help:
help();
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] == 'U') {
undef_symbol(r + 2);
} else if (r[1] == 'l') {
open_dll(r + 2);
} else if (r[1] == 'i') {
if (optind >= argc)
goto show_help;
tcc_compile_file(argv[optind++]);
} else if (!strcmp(r + 1, "bench")) {
do_bench = 1;
} else if (r[1] == 'b') {
if (!do_bounds_check) {
do_bounds_check = 1;
/* define symbol */
define_symbol("__BOUNDS_CHECKING_ON");
/* create bounds sections */
bounds_section = new_section(".bounds",
SHT_PROGBITS, SHF_ALLOC);
lbounds_section = new_section(".lbounds",
SHT_PROGBITS, SHF_ALLOC);
/* debug is implied */
goto debug_opt;
}
} else if (r[1] == 'g') {
debug_opt:
if (!do_debug) {
do_debug = 1;
/* stab symbols */
stab_section = new_section(".stab", SHT_PROGBITS, 0);
stab_section->sh_entsize = sizeof(Stab_Sym);
stabstr_section = new_section(".stabstr", SHT_STRTAB, 0);
put_elf_str(stabstr_section, "");
stab_section->link = stabstr_section;
/* put first entry */
put_stabs("", 0, 0, 0, 0);
/* elf symbols */
symtab_section = new_section(".symtab", SHT_SYMTAB, 0);
symtab_section->sh_entsize = sizeof(Elf32_Sym);
strtab_section = new_section(".strtab", SHT_STRTAB, 0);
put_elf_str(strtab_section, "");
symtab_section->link = strtab_section;
put_elf_sym(symtab_section, 0, 0, 0, 0, 0, NULL);
}
} 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);
}
}
tcc_compile_file(argv[optind]);
if (do_bench) {
printf("total: %d idents, %d lines, %d bytes\n",
tok_ident - TOK_IDENT, total_lines, total_bytes);
}
resolve_extern_syms();
if (outfile) {
build_exe(outfile);
return 0;
} else {
return launch_exe(argc - optind, argv + optind);
}
}
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