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radare2/shlr/tcc/tccgen.c

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/*
* TCC - Tiny C Compiler
*
* Copyright (c) 2001-2004 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tcc.h"
/* callback pointer */
ST_DATA char **tcc_cb_ptr;
/********************************************************/
/* global variables */
/* loc : local variable index
ind : output code index
rsym: return symbol
anon_sym: anonymous symbol index
*/
ST_DATA int rsym, anon_sym, ind, loc;
ST_DATA Sym *sym_free_first;
ST_DATA void **sym_pools;
ST_DATA int nb_sym_pools;
static int arraysize = 0;
static const char *global_symname = NULL;
static const char *global_type = NULL;
ST_DATA Sym *global_stack;
ST_DATA Sym *local_stack;
ST_DATA Sym *scope_stack_bottom;
ST_DATA Sym *define_stack;
ST_DATA Sym *global_label_stack;
ST_DATA Sym *local_label_stack;
ST_DATA int vla_sp_loc_tmp; /* vla_sp_loc is set to this when the value won't be needed later */
ST_DATA int vla_sp_root_loc; /* vla_sp_loc for SP before any VLAs were pushed */
ST_DATA int *vla_sp_loc; /* Pointer to variable holding location to store stack pointer on the stack when modifying stack pointer */
ST_DATA int vla_flags; /* VLA_* flags */
ST_DATA SValue __vstack[1+VSTACK_SIZE], *vtop;
ST_DATA int const_wanted; /* true if constant wanted */
ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
ST_DATA CType func_vt; /* current function return type (used by return instruction) */
ST_DATA int func_vc;
ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
ST_DATA char *funcname;
ST_DATA CType char_pointer_type, func_old_type, int_type, llong_type, size_type;
/* ------------------------------------------------------------------------- */
static inline CType *pointed_type(CType *type);
static int is_compatible_types(CType *type1, CType *type2);
static int parse_btype(CType *type, AttributeDef *ad);
static void type_decl(CType *type, AttributeDef *ad, int *v, int td);
static void parse_expr_type(CType *type);
static void decl_initializer(CType *type, unsigned long c, int first, int size_only);
static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, char *asm_label, int scope);
static int decl0(int l, int is_for_loop_init);
static void expr_eq(void);
static void unary_type(CType *type);
static int is_compatible_parameter_types(CType *type1, CType *type2);
static void expr_type(CType *type);
ST_INLN int is_float(int t)
{
int bt;
bt = t & VT_BTYPE;
return bt == VT_LDOUBLE || bt == VT_DOUBLE || bt == VT_FLOAT || bt == VT_QFLOAT;
}
/* we use our own 'finite' function to avoid potential problems with
non standard math libs */
/* XXX: endianness dependent */
ST_FUNC int ieee_finite(double d)
{
int *p = (int *)&d;
return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
}
ST_FUNC void test_lvalue(void)
{
if (!(vtop->r & VT_LVAL))
expect("lvalue");
}
/* ------------------------------------------------------------------------- */
/* symbol allocator */
static Sym *__sym_malloc(void)
{
Sym *sym_pool, *sym, *last_sym;
int i;
int sym_pool_size = SYM_POOL_NB * sizeof(Sym);
sym_pool = malloc(sym_pool_size);
memset(sym_pool, 0, sym_pool_size);
dynarray_add(&sym_pools, &nb_sym_pools, sym_pool);
last_sym = sym_free_first;
sym = sym_pool;
for(i = 0; i < SYM_POOL_NB; i++) {
sym->next = last_sym;
last_sym = sym;
sym++;
}
sym_free_first = last_sym;
return last_sym;
}
static inline Sym *sym_malloc(void)
{
Sym *sym;
sym = sym_free_first;
if (!sym)
sym = __sym_malloc();
sym_free_first = sym->next;
return sym;
}
ST_INLN void sym_free(Sym *sym)
{
sym->next = sym_free_first;
free(sym->asm_label);
sym_free_first = sym;
}
/* push, without hashing */
ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long long c)
{
Sym *s;
if (ps == &local_stack) {
for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
tcc_error("incompatible types for redefinition of '%s'",
get_tok_str(v, NULL));
}
// printf (" %d %ld set symbol '%s'\n", t, c, get_tok_str(v, NULL));
// s = *ps;
s = sym_malloc ();
s->asm_label = NULL;
s->v = v;
s->type.t = t;
s->type.ref = NULL;
#ifdef _WIN64
s->d = NULL;
#endif
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 */
ST_FUNC Sym *sym_find2(Sym *s, int v)
{
while (s) {
if (s->v == v)
return s;
s = s->prev;
}
return NULL;
}
/* structure lookup */
ST_INLN Sym *struct_find(int v)
{
v -= TOK_IDENT;
if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
return NULL;
return table_ident[v]->sym_struct;
}
/* find an identifier */
ST_INLN Sym *sym_find(int v)
{
v -= TOK_IDENT;
if ((unsigned)v >= (unsigned)(tok_ident - TOK_IDENT))
return NULL;
return table_ident[v]->sym_identifier;
}
// TODO: Add better way to store the meta information
// about the pushed type
int tcc_sym_push(char* typename, int typesize, int meta)
{
CType *new_type;
new_type = (CType*)malloc(sizeof(CType));
if (!new_type) {
return 0;
}
new_type->ref = sym_malloc();
new_type->t = meta;
sym_push(0, new_type, 0, 0);
return 1;
}
void dump_type(CType *type, int depth)
{
if (depth <= 0) return;
eprintf("------------------------\n");
int bt = type->t & VT_BTYPE;
eprintf("BTYPE = %d ", bt);
switch (bt) {
case VT_STRUCT: eprintf("[STRUCT]\n");
break;
case VT_PTR: eprintf("[PTR]\n");
break;
case VT_ENUM: eprintf("[ENUM]\n");
break;
case VT_LLONG: eprintf("[LLONG]\n");
break;
case VT_INT: eprintf("[INT]\n");
break;
case VT_SHORT: eprintf("[SHORT]\n");
break;
case VT_BYTE: eprintf("[BYTE]\n");
break;
default:
eprintf("\n");
break;
}
if (type->ref) {
eprintf("v = %d\n", type->ref->v);
char *varstr = NULL;
varstr = get_tok_str(type->ref->v, NULL);
if (varstr) {
eprintf("var = %s\n", varstr);
}
if (type->ref->asm_label) {
eprintf("asm_label = %s\n", type->ref->asm_label);
}
eprintf("r = %d\n", type->ref->r);
eprintf("associated type:\n");
//dump_type(&(type->ref->type), --depth);
}
}
/* push a given symbol on the symbol stack */
ST_FUNC Sym *sym_push(int v, CType *type, int r, long long c)
{
Sym *s, **ps;
TokenSym *ts;
if (local_stack)
ps = &local_stack;
else
ps = &global_stack;
//dump_type(type, 5);
s = sym_push2(ps, v, type->t, c);
s->type.ref = type->ref;
s->r = r;
/* don't record fields or anonymous symbols */
/* XXX: simplify */
if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
/* record symbol in token array */
ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
if (v & SYM_STRUCT)
ps = &ts->sym_struct;
else
ps = &ts->sym_identifier;
s->prev_tok = *ps;
*ps = s;
}
return s;
}
/* push a global identifier */
ST_FUNC Sym *global_identifier_push(int v, int t, long long c)
{
Sym *s, **ps;
s = sym_push2(&global_stack, v, t, c);
/* don't record anonymous symbol */
if (v < SYM_FIRST_ANOM) {
ps = &table_ident[v - TOK_IDENT]->sym_identifier;
/* modify the top most local identifier, so that
sym_identifier will point to 's' when popped */
while (*ps != NULL)
ps = &(*ps)->prev_tok;
s->prev_tok = NULL;
*ps = s;
}
return s;
}
/* pop symbols until top reaches 'b' */
ST_FUNC void sym_pop(Sym **ptop, Sym *b)
{
Sym *s, *ss, **ps;
TokenSym *ts;
int v;
s = *ptop;
while(s != b) {
ss = s->prev;
v = s->v;
/* remove symbol in token array */
/* XXX: simplify */
if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
ts = table_ident[(v & ~SYM_STRUCT) - TOK_IDENT];
if (v & SYM_STRUCT)
ps = &ts->sym_struct;
else
ps = &ts->sym_identifier;
*ps = s->prev_tok;
}
sym_free(s);
s = ss;
}
*ptop = b;
}
static void weaken_symbol(Sym *sym)
{
sym->type.t |= VT_WEAK;
}
/* ------------------------------------------------------------------------- */
ST_FUNC void swap(int *p, int *q)
{
int t;
t = *p;
*p = *q;
*q = t;
}
static void vsetc(CType *type, int r, CValue *vc)
{
if (vtop >= vstack + (VSTACK_SIZE - 1))
tcc_error("memory full");
vtop++;
vtop->type = *type;
vtop->r = r;
vtop->r2 = VT_CONST;
vtop->c = *vc;
}
/* push constant of type "type" with useless value */
void vpush(CType *type)
{
CValue cval;
vsetc(type, VT_CONST, &cval);
}
/* push integer constant */
ST_FUNC void vpushi(int v)
{
CValue cval = {0};
cval.i = v;
vsetc(&int_type, VT_CONST, &cval);
}
/* push a pointer sized constant */
static void vpushs(long long v)
{
CValue cval;
if (PTR_SIZE == 4)
cval.i = (int)v;
else
cval.ull = v;
vsetc(&size_type, VT_CONST, &cval);
}
/* push arbitrary 64 bit constant */
void vpush64(int ty, unsigned long long v)
{
CValue cval;
CType ctype;
ctype.t = ty;
ctype.ref = NULL;
cval.ull = v;
vsetc(&ctype, VT_CONST, &cval);
}
/* push long long constant */
ST_FUNC void vpushll(long long v)
{
CValue cval;
cval.ll = v;
vsetc(&llong_type, VT_CONST, &cval);
}
ST_FUNC void vset(CType *type, int r, int v)
{
CValue cval;
cval.i = v;
vsetc(type, r, &cval);
}
static void vseti(int r, int v)
{
CType type;
type.t = VT_INT;
type.ref = NULL;
vset(&type, r, v);
}
ST_FUNC void vswap(void)
{
SValue tmp;
/* cannot let cpu flags if other instruction are generated. Also
avoid leaving VT_JMP anywhere except on the top of the stack
because it would complicate the code generator. */
tmp = vtop[0];
vtop[0] = vtop[-1];
vtop[-1] = tmp;
/* XXX: +2% overall speed possible with optimized memswap
*
* memswap(&vtop[0], &vtop[1], sizeof *vtop);
*/
}
ST_FUNC void vpushv(SValue *v)
{
if (vtop >= vstack + (VSTACK_SIZE - 1))
tcc_error("memory full");
vtop++;
*vtop = *v;
}
static void vdup(void)
{
vpushv(vtop);
}
/* get address of vtop (vtop MUST BE an lvalue) */
static 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_LVAL_TYPE)) | VT_LOCAL | VT_LVAL;
}
static int pointed_size(CType *type)
{
int align;
return type_size(pointed_type(type), &align);
}
#if 0
static inline int is_null_pointer(SValue *p)
{
if ((p->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
return 0;
return ((p->type.t & VT_BTYPE) == VT_INT && p->c.i == 0) ||
((p->type.t & VT_BTYPE) == VT_LLONG && p->c.ll == 0) ||
((p->type.t & VT_BTYPE) == VT_PTR && p->c.ptr == 0);
}
#endif
static inline int is_integer_btype(int bt)
{
return (bt == VT_BYTE || bt == VT_SHORT ||
bt == VT_INT || bt == VT_LLONG);
}
/* return type size as known at compile time. Put alignment at 'a' */
ST_FUNC int type_size(CType *type, int *a)
{
Sym *s;
int bt;
bt = type->t & VT_BTYPE;
if (bt == VT_STRUCT) {
/* struct/union */
s = type->ref;
*a = s->r;
return s->c;
} else if (bt == VT_PTR) {
if (type->t & VT_ARRAY) {
int ts;
s = type->ref;
ts = type_size(&s->type, a);
if (ts < 0 && s->c < 0)
ts = -ts;
return ts * 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) {
if (!strncmp(tcc_state->arch, "x86", 3) && tcc_state->bits == 32) {
if (!strncmp(tcc_state->os, "windows", 7)) {
*a = 8;
} else {
*a = 4;
}
} else if (!strncmp(tcc_state->arch, "arm", 3)) {
/* It was like originally:
#ifdef TCC_ARM_EABI
*a = 8;
#else
*a = 4;
#endif
FIXME: Determine EABI then too
*/
*a = 8;
} else {
*a = 8;
}
return 8;
} else if (bt == VT_ENUM) {
/* Non standard, but still widely used
* and implemented in GCC, MSVC */
*a = 8;
return 8;
} else if (bt == VT_INT || bt == VT_FLOAT) {
*a = 4;
return 4;
} else if (bt == VT_SHORT) {
*a = 2;
return 2;
} else if (bt == VT_QLONG || bt == VT_QFLOAT) {
*a = 8;
return 16;
} else {
/* char, void, function, _Bool */
*a = 1;
return 1;
}
}
/* return the pointed type of t */
static inline CType *pointed_type(CType *type)
{
return &type->ref->type;
}
/* modify type so that its it is a pointer to type. */
ST_FUNC void mk_pointer(CType *type)
{
Sym *s;
s = sym_push(SYM_FIELD, type, 0, -1);
type->t = VT_PTR | (type->t & ~VT_TYPE);
type->ref = s;
}
/* compare function types. OLD functions match any new functions */
static int is_compatible_func(CType *type1, CType *type2)
{
Sym *s1, *s2;
s1 = type1->ref;
s2 = type2->ref;
if (!is_compatible_types(&s1->type, &s2->type))
return 0;
/* check func_call */
if (FUNC_CALL(s1->r) != FUNC_CALL(s2->r))
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_parameter_types(&s1->type, &s2->type))
return 0;
s1 = s1->next;
s2 = s2->next;
}
if (s2)
return 0;
return 1;
}
/* return true if type1 and type2 are the same. If unqualified is
true, qualifiers on the types are ignored.
- enums are not checked as gcc __builtin_types_compatible_p ()
*/
static int compare_types(CType *type1, CType *type2, int unqualified)
{
int bt1, t1, t2;
t1 = type1->t & VT_TYPE;
t2 = type2->t & VT_TYPE;
if (unqualified) {
/* strip qualifiers before comparing */
t1 &= ~(VT_CONSTANT | VT_VOLATILE);
t2 &= ~(VT_CONSTANT | VT_VOLATILE);
}
/* XXX: bitfields ? */
if (t1 != t2)
return 0;
/* test more complicated cases */
bt1 = t1 & VT_BTYPE;
if (bt1 == VT_PTR) {
type1 = pointed_type(type1);
type2 = pointed_type(type2);
return is_compatible_types(type1, type2);
} else if (bt1 == VT_STRUCT) {
return (type1->ref == type2->ref);
} else if (bt1 == VT_FUNC) {
return is_compatible_func(type1, type2);
} else {
return 1;
}
}
/* return true if type1 and type2 are exactly the same (including
qualifiers).
*/
static int is_compatible_types(CType *type1, CType *type2)
{
return compare_types(type1,type2,0);
}
/* return true if type1 and type2 are the same (ignoring qualifiers).
*/
static int is_compatible_parameter_types(CType *type1, CType *type2)
{
return compare_types(type1,type2,1);
}
/* 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 */
static void type_to_str(char *buf, int buf_size,
CType *type, const char *varstr)
{
int bt, v, t;
Sym *s, *sa;
char buf1[256];
const char *tstr;
t = type->t & VT_TYPE;
bt = t & VT_BTYPE;
buf[0] = '\0';
if (t & VT_CONSTANT)
pstrcat(buf, buf_size, "const ");
if (t & VT_VOLATILE)
pstrcat(buf, buf_size, "volatile ");
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 = type->ref->v & ~SYM_STRUCT;
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 = type->ref;
type_to_str(buf, buf_size, &s->type, varstr);
pstrcat(buf, buf_size, "(");
sa = s->next;
while (sa != NULL) {
type_to_str(buf1, sizeof(buf1), &sa->type, 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 = type->ref;
if (t & VT_ARRAY) {
type_to_str(buf, buf_size, &s->type, NULL);
} else {
pstrcpy(buf1, sizeof(buf1), "*");
if (varstr)
pstrcat(buf1, sizeof(buf1), varstr);
type_to_str(buf, buf_size, &s->type, buf1);
}
goto no_var;
}
if (varstr) {
pstrcat(buf, buf_size, " ");
pstrcat(buf, buf_size, varstr);
}
no_var: ;
}
/* Parse GNUC __attribute__ extension. Currently, the following
extensions are recognized:
- aligned(n) : set data/function alignment.
- packed : force data alignment to 1
- unused : currently ignored, but may be used someday.
- regparm(n) : pass function parameters in registers (i386 only)
*/
static void parse_attribute(AttributeDef *ad)
{
int t;
long long n;
while (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2) {
next();
skip('(');
skip('(');
while (tok != ')') {
if (tok < TOK_IDENT)
expect("attribute name");
t = tok;
next();
switch(t) {
case TOK_ALIAS1:
case TOK_ALIAS2:
skip('(');
if (tok != TOK_STR)
expect("alias(\"target\")");
ad->alias_target = /* save string as token, for later */
tok_alloc((char*)tokc.cstr->data, tokc.cstr->size-1)->tok;
next();
skip(')');
break;
case TOK_ALIGNED1:
case TOK_ALIGNED2:
if (tok == '(') {
next();
n = expr_const();
if (n <= 0 || (n & (n - 1)) != 0)
tcc_error("alignment must be a positive power of two");
skip(')');
} else {
n = MAX_ALIGN;
}
ad->aligned = n;
break;
case TOK_PACKED1:
case TOK_PACKED2:
ad->packed = 1;
break;
case TOK_WEAK1:
case TOK_WEAK2:
ad->weak = 1;
break;
case TOK_UNUSED1:
case TOK_UNUSED2:
/* currently, no need to handle it because tcc does not
track unused objects */
break;
case TOK_NORETURN1:
case TOK_NORETURN2:
/* currently, no need to handle it because tcc does not
track unused objects */
break;
case TOK_CDECL1:
case TOK_CDECL2:
case TOK_CDECL3:
ad->func_call = FUNC_CDECL;
break;
case TOK_STDCALL1:
case TOK_STDCALL2:
case TOK_STDCALL3:
ad->func_call = FUNC_STDCALL;
break;
#ifdef TCC_TARGET_I386
case TOK_REGPARM1:
case TOK_REGPARM2:
skip('(');
n = expr_const();
if (n > 3)
n = 3;
else if (n < 0)
n = 0;
if (n > 0)
ad->func_call = FUNC_FASTCALL1 + n - 1;
skip(')');
break;
case TOK_FASTCALL1:
case TOK_FASTCALL2:
case TOK_FASTCALL3:
ad->func_call = FUNC_FASTCALLW;
break;
#endif
case TOK_MODE:
skip('(');
switch(tok) {
case TOK_MODE_DI:
ad->mode = VT_LLONG + 1;
break;
case TOK_MODE_HI:
ad->mode = VT_SHORT + 1;
break;
case TOK_MODE_SI:
ad->mode = VT_INT + 1;
break;
default:
tcc_warning("__mode__(%s) not supported\n", get_tok_str(tok, NULL));
break;
}
next();
skip(')');
break;
case TOK_DLLEXPORT:
ad->func_export = 1;
break;
case TOK_DLLIMPORT:
ad->func_import = 1;
break;
default:
if (tcc_state->warn_unsupported)
tcc_warning("'%s' attribute ignored", get_tok_str(t, NULL));
/* skip parameters */
if (tok == '(') {
int parenthesis = 0;
do {
if (tok == '(')
parenthesis++;
else if (tok == ')')
parenthesis--;
next();
} while (parenthesis && tok != -1);
}
break;
}
if (tok != ',')
break;
next();
}
skip(')');
skip(')');
}
}
/* enum/struct/union declaration. u is either VT_ENUM or VT_STRUCT */
static void struct_decl(CType *type, int u)
{
int a, v, size, align, maxalign, offset;
long long c = 0;
int bit_size, bit_pos, bsize, bt, lbit_pos, prevbt;
Sym *s, *ss, *ass, **ps;
AttributeDef ad;
const char *name = NULL;
STACK_NEW0(CType, type1);
STACK_NEW0(CType, btype);
a = tok; /* save decl type */
next();
name = get_tok_str (tok, NULL);
if (tok != '{') {
v = tok;
next();
/* struct already defined ? return it */
if (v < TOK_IDENT)
expect("struct/union/enum name");
s = struct_find(v);
if (s) {
if (s->type.t != a)
tcc_error("invalid type");
goto do_decl;
}
} else {
v = anon_sym++;
}
type1.t = a;
/* we put an undefined size for struct/union */
s = sym_push(v | SYM_STRUCT, &type1, 0, -1);
s->r = 0; /* default alignment is zero as gcc */
/* put struct/union/enum name in type */
do_decl:
type->t = u;
type->ref = s;
if (tok == '{') {
next();
if (s->c != -1)
tcc_error("struct/union/enum already defined");
/* cannot be empty */
c = 0LL;
/* non empty enums are not allowed */
if (a == TOK_ENUM) {
if (!strcmp (name, "{")) {
// UNNAMED
fprintf (stderr, "anonymous enums are ignored\n");
} else {
tcc_appendf ("%s=enum\n", name);
}
for(;;) {
v = tok;
if (v < TOK_UIDENT)
expect("identifier");
next();
if (tok == '=') {
next();
c = expr_const();
}
if (strcmp (name, "{")) {
char *varstr = get_tok_str (v, NULL);
//eprintf("%s.%s @ 0x%"PFMT64x"\n", name, varstr, c);
tcc_appendf ("%s.%s=0x%"PFMT64x"\n", name, varstr, c);
tcc_appendf ("%s.0x%"PFMT64x"=%s\n", name, c, varstr);
// TODO: if token already defined throw an error
// if (varstr isInside (arrayOfvars)) { erprintf ("ERROR: DUP VAR IN ENUM\n"); }
}
/* enum symbols have static storage */
ss = sym_push(v, &llong_type, VT_CONST, c);
ss->type.t |= VT_STATIC;
if (tok != ',')
break;
next();
c++;
/* NOTE: we accept a trailing comma */
if (tok == '}')
break;
}
skip('}');
} else {
maxalign = 1;
ps = &s->next;
prevbt = VT_INT;
bit_pos = 0;
offset = 0;
while (tok != '}') {
if (!parse_btype(&btype, &ad)) {
expect("bracket");
break;
}
while (1) {
bit_size = -1;
v = 0;
memcpy(&type1, &btype, sizeof(type1));
if (tok != ':') {
type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
expect("identifier");
if ((type1.t & VT_BTYPE) == VT_FUNC ||
(type1.t & (VT_TYPEDEF | VT_STATIC | VT_EXTERN | VT_INLINE)))
tcc_error("invalid type for '%s'",
get_tok_str(v, NULL));
}
if (tok == ':') {
next();
bit_size = (int)expr_const();
/* XXX: handle v = 0 case for messages */
if (bit_size < 0)
tcc_error("negative width in bit-field '%s'",
get_tok_str(v, NULL));
if (v && bit_size == 0)
tcc_error("zero width for bit-field '%s'",
get_tok_str(v, NULL));
}
size = type_size(&type1, &align);
if (ad.aligned) {
if (align < ad.aligned)
align = ad.aligned;
} else if (ad.packed) {
align = 1;
} else if (*tcc_state->pack_stack_ptr) {
if (align > *tcc_state->pack_stack_ptr)
align = *tcc_state->pack_stack_ptr;
}
lbit_pos = 0;
if (bit_size >= 0) {
bt = type1.t & VT_BTYPE;
if (bt != VT_INT &&
bt != VT_BYTE &&
bt != VT_SHORT &&
bt != VT_BOOL &&
bt != VT_ENUM &&
bt != VT_LLONG)
tcc_error("bitfields must have scalar type");
bsize = size * 8;
if (bit_size > bsize) {
tcc_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 */
bit_pos = 0;
} else {
/* we do not have enough room ?
did the type change?
is it a union? */
if ((bit_pos + bit_size) > bsize ||
bt != prevbt || a == TOK_UNION)
bit_pos = 0;
lbit_pos = bit_pos;
/* XXX: handle LSB first */
type1.t |= VT_BITFIELD |
(bit_pos << VT_STRUCT_SHIFT) |
(bit_size << (VT_STRUCT_SHIFT + 6));
bit_pos += bit_size;
}
prevbt = bt;
} else {
bit_pos = 0;
}
if (v != 0 || (type1.t & VT_BTYPE) == VT_STRUCT) {
/* add new memory data only if starting
bit field */
if (lbit_pos == 0) {
if (a == TOK_STRUCT) {
c = (c + align - 1) & -align;
offset = c;
if (size > 0)
c += size;
} else {
offset = 0;
if (size > c)
c = size;
}
if (align > maxalign)
maxalign = align;
}
#if 1
char b[1024];
char *varstr = get_tok_str (v, NULL);
type_to_str (b, sizeof(b), &type1, NULL);
{
const char *ctype = (a == TOK_UNION)? "union": "struct";
int type_bt = type1.t & VT_BTYPE;
//eprintf("2: %s.%s = %s\n", ctype, name, varstr);
tcc_appendf ("%s=%s\n", name, ctype);
tcc_appendf ("[+]%s.%s=%s\n",
ctype, name, varstr);
tcc_appendf ("%s.%s.%s.meta=%d\n",
ctype, name, varstr, type_bt);
/* compact form */
tcc_appendf ("%s.%s.%s=%s,%d,%d\n",
ctype, name,varstr,b,offset,arraysize);
}
#if 0
printf ("struct.%s.%s.type=%s\n", name, varstr, b);
printf ("struct.%s.%s.offset=%d\n", name, varstr, offset);
printf ("struct.%s.%s.array=%d\n", name, varstr, arraysize);
#endif
//(%s) field (%s) offset=%d array=%d", name, b, get_tok_str(v, NULL), offset, arraysize);
arraysize = 0;
if (type1.t & VT_BITFIELD) {
tcc_appendf (" pos=%d size=%d",
(type1.t >> VT_STRUCT_SHIFT) & 0x3f,
(type1.t >> (VT_STRUCT_SHIFT + 6)) & 0x3f);
}
//printf("\n");
#endif
}
if (v == 0 && (type1.t & VT_BTYPE) == VT_STRUCT) {
ass = type1.ref;
while ((ass = ass->next) != NULL) {
ss = sym_push(ass->v, &ass->type, 0, offset + ass->c);
*ps = ss;
ps = &ss->next;
}
} else if (v) {
ss = sym_push(v | SYM_FIELD, &type1, 0, offset);
*ps = ss;
ps = &ss->next;
}
if (tok == ';' || tok == TOK_EOF)
break;
skip(',');
}
skip(';');
}
skip('}');
/* store size and alignment */
s->c = (c + maxalign - 1) & -maxalign;
s->r = maxalign;
}
}
}
/* return 0 if no type declaration. otherwise, return the basic type
and skip it.
*/
static int parse_btype(CType *type, AttributeDef *ad)
{
int t, u, type_found, typespec_found, typedef_found;
Sym *s;
STACK_NEW0(CType, type1);
memset(ad, 0, sizeof(AttributeDef));
type_found = 0;
typespec_found = 0;
typedef_found = 0;
t = 0;
while(1) {
switch(tok) {
case TOK_EXTENSION:
/* currently, we really ignore extension */
next();
continue;
/* basic types */
case TOK_CHAR:
u = VT_BYTE;
basic_type:
next();
basic_type1:
if ((t & VT_BTYPE) != 0)
tcc_error("too many basic types");
t |= u;
typespec_found = 1;
break;
case TOK_VOID:
u = VT_VOID;
goto basic_type;
case TOK_SHORT:
u = VT_SHORT;
goto basic_type;
case TOK_INT:
next();
typespec_found = 1;
break;
case TOK_LONG:
next();
if ((t & VT_BTYPE) == VT_DOUBLE) {
// #ifndef TCC_TARGET_PE
if (strncmp(tcc_state->os, "windows", 7)) {
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) {
if (!strncmp(tcc_state->os, "windows", 7)) {
t = (t & ~VT_BTYPE) | VT_DOUBLE;
} else {
t = (t & ~VT_BTYPE) | VT_LDOUBLE;
}
} else {
u = VT_DOUBLE;
goto basic_type1;
}
break;
case TOK_ENUM:
struct_decl(&type1, VT_ENUM);
basic_type2:
u = type1.t;
type->ref = type1.ref;
goto basic_type1;
case TOK_STRUCT:
case TOK_UNION:
struct_decl(&type1, VT_STRUCT);
goto basic_type2;
/* type modifiers */
case TOK_CONST1:
case TOK_CONST2:
case TOK_CONST3:
t |= VT_CONSTANT;
next();
break;
case TOK_VOLATILE1:
case TOK_VOLATILE2:
case TOK_VOLATILE3:
t |= VT_VOLATILE;
next();
break;
case TOK_SIGNED1:
case TOK_SIGNED2:
case TOK_SIGNED3:
typespec_found = 1;
t |= VT_SIGNED;
next();
break;
case TOK_REGISTER:
case TOK_AUTO:
case TOK_RESTRICT1:
case TOK_RESTRICT2:
case TOK_RESTRICT3:
next();
break;
case TOK_UNSIGNED:
t |= VT_UNSIGNED;
next();
typespec_found = 1;
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;
case TOK_INLINE1:
case TOK_INLINE2:
case TOK_INLINE3:
t |= VT_INLINE;
next();
break;
/* GNUC attribute */
case TOK_ATTRIBUTE1:
case TOK_ATTRIBUTE2:
parse_attribute(ad);
if (ad->mode) {
u = ad->mode -1;
t = (t & ~VT_BTYPE) | u;
}
break;
/* GNUC typeof */
case TOK_TYPEOF1:
case TOK_TYPEOF2:
case TOK_TYPEOF3:
next();
parse_expr_type(&type1);
/* remove all storage modifiers except typedef */
type1.t &= ~(VT_STORAGE&~VT_TYPEDEF);
goto basic_type2;
default:
if (typespec_found || typedef_found)
goto the_end;
s = sym_find(tok);
if (!s || !(s->type.t & VT_TYPEDEF))
goto the_end;
typedef_found = 1;
t |= (s->type.t & ~VT_TYPEDEF);
type->ref = s->type.ref;
if (s->r) {
/* get attributes from typedef */
if (0 == ad->aligned)
ad->aligned = FUNC_ALIGN(s->r);
if (0 == ad->func_call)
ad->func_call = FUNC_CALL(s->r);
ad->packed |= FUNC_PACKED(s->r);
}
next();
typespec_found = 1;
break;
}
type_found = 1;
}
the_end:
if ((t & (VT_SIGNED|VT_UNSIGNED)) == (VT_SIGNED|VT_UNSIGNED))
tcc_error("signed and unsigned modifier");
if (tcc_state->char_is_unsigned) {
if ((t & (VT_SIGNED|VT_UNSIGNED|VT_BTYPE)) == VT_BYTE)
t |= VT_UNSIGNED;
}
t &= ~VT_SIGNED;
/* long is never used as type */
if ((t & VT_BTYPE) == VT_LONG)
#if !defined TCC_TARGET_X86_64 || defined TCC_TARGET_PE
t = (t & ~VT_BTYPE) | VT_INT;
#else
t = (t & ~VT_BTYPE) | VT_LLONG;
#endif
type->t = t;
return type_found;
}
/* convert a function parameter type (array to pointer and function to
function pointer) */
static inline void convert_parameter_type(CType *pt)
{
/* remove const and volatile qualifiers (XXX: const could be used
to indicate a const function parameter */
pt->t &= ~(VT_CONSTANT | VT_VOLATILE);
/* array must be transformed to pointer according to ANSI C */
pt->t &= ~VT_ARRAY;
if ((pt->t & VT_BTYPE) == VT_FUNC) {
mk_pointer(pt);
}
}
static void post_type(CType *type, AttributeDef *ad)
{
int n, l, t1, arg_size, align;
Sym **plast, *s, *first;
AttributeDef ad1;
CType pt;
char *symname = NULL;
int narg =0;
if (tok == '(') {
/* function declaration */
next();
l = 0;
first = NULL;
plast = &first;
{
const char *ret_type = global_type;
free (symname);
symname = strdup (global_symname);
tcc_appendf ("func.%s.ret=%s\n", symname, ret_type);
tcc_appendf ("func.%s.cc=%s\n", symname, "cdecl"); // TODO
tcc_appendf ("%s=func\n", symname);
}
arg_size = 0;
if (tok != ')') {
for(;;) {
/* read param name and compute offset */
if (l != FUNC_OLD) {
if (!parse_btype(&pt, &ad1)) {
if (l) {
tcc_error("invalid type");
} else {
l = FUNC_OLD;
goto old_proto;
}
}
l = FUNC_NEW;
if ((pt.t & VT_BTYPE) == VT_VOID && tok == ')')
break;
type_decl(&pt, &ad1, &n, TYPE_DIRECT | TYPE_ABSTRACT);
if ((pt.t & VT_BTYPE) == VT_VOID)
tcc_error("parameter declared as void");
arg_size += (type_size(&pt, &align) + PTR_SIZE - 1) / PTR_SIZE;
} else {
old_proto:
n = tok;
if (n < TOK_UIDENT)
expect("identifier");
pt.t = VT_INT;
next();
}
convert_parameter_type(&pt);
s = sym_push(n | SYM_FIELD, &pt, 0, 0);
{
char kind[1024];
type_to_str (kind, sizeof (kind), &pt, NULL);
tcc_appendf ("func.%s.arg.%d=%s,%s\n",
symname, narg, kind, global_symname);
narg++;
}
*plast = s;
plast = &s->next;
if (tok == ')')
break;
skip(',');
if (l == FUNC_NEW && tok == TOK_DOTS) {
l = FUNC_ELLIPSIS;
next();
break;
}
}
}
tcc_appendf ("func.%s.args=%d\n", symname, narg);
/* if no parameters, then old type prototype */
if (l == 0)
l = FUNC_OLD;
skip(')');
/* NOTE: const is ignored in returned type as it has a special
meaning in gcc / C++ */
type->t &= ~VT_CONSTANT;
/* some ancient pre-K&R C allows a function to return an array
and the array brackets to be put after the arguments, such
that "int c()[]" means something like "int[] c()" */
if (tok == '[') {
next();
skip(']'); /* only handle simple "[]" */
type->t |= VT_PTR;
}
/* we push a anonymous symbol which will contain the function prototype */
ad->func_args = arg_size;
s = sym_push(SYM_FIELD, type, INT_ATTR(ad), l);
s->next = first;
type->t = VT_FUNC;
type->ref = s;
free(symname);
symname = NULL;
} else if (tok == '[') {
/* array definition */
next();
if (tok == TOK_RESTRICT1)
next();
n = -1;
t1 = 0;
if (tok != ']') {
if (!local_stack || nocode_wanted)
vpushll(expr_const());
else gexpr();
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST) {
n = vtop->c.i;
if (n < 0)
tcc_error("invalid array size");
} else {
if (!is_integer_btype(vtop->type.t & VT_BTYPE))
tcc_error("size of variable length array should be an integer");
t1 = VT_VLA;
}
}
skip(']');
/* parse next post type */
post_type(type, ad);
/* we push an anonymous symbol which will contain the array
element type */
arraysize = n;
#if 0
if (n<0) {
printf ("array with no size []\n");
} else {
printf ("PUSH SIZE %d\n", n);
}
#endif
s = sym_push(SYM_FIELD, type, 0, n);
type->t = (t1 ? VT_VLA : VT_ARRAY) | VT_PTR;
type->ref = s;
}
}
/* Parse a type declaration (except basic type), and return the type
in 'type'. 'td' is a bitmask indicating which kind of type decl is
expected. 'type' should contain the basic type. 'ad' is the
attribute definition of the basic type. It can be modified by
type_decl().
*/
static void type_decl(CType *type, AttributeDef *ad, int *v, int td)
{
Sym *s;
int qualifiers, storage;
CType *type1 = R_NEW0(CType);
CType *type2 = R_NEW0(CType);
if (!type1 || !type2) {
free (type1);
free (type2);
return;
}
while (tok == '*') {
qualifiers = 0;
redo:
next();
switch(tok) {
case TOK_CONST1:
case TOK_CONST2:
case TOK_CONST3:
qualifiers |= VT_CONSTANT;
goto redo;
case TOK_VOLATILE1:
case TOK_VOLATILE2:
case TOK_VOLATILE3:
qualifiers |= VT_VOLATILE;
goto redo;
case TOK_RESTRICT1:
case TOK_RESTRICT2:
case TOK_RESTRICT3:
goto redo;
}
mk_pointer(type);
type->t |= qualifiers;
}
/* XXX: clarify attribute handling */
if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
parse_attribute(ad);
/* recursive type */
/* XXX: incorrect if abstract type for functions (e.g. 'int ()') */
type1->t = 0; /* XXX: same as int */
if (tok == '(') {
next();
/* XXX: this is not correct to modify 'ad' at this point, but
the syntax is not clear */
if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
parse_attribute(ad);
type_decl(type1, ad, v, td);
skip(')');
} else {
/* type identifier */
if (tok >= TOK_IDENT && (td & TYPE_DIRECT)) {
*v = tok;
next();
} else {
if (!(td & TYPE_ABSTRACT))
expect("identifier");
*v = 0;
}
}
storage = type->t & VT_STORAGE;
type->t &= ~VT_STORAGE;
if (storage & VT_STATIC) {
int saved_nocode_wanted = nocode_wanted;
nocode_wanted = 1;
//eprintf ("STATIC %s\n", get_tok_str(*v, NULL));
post_type(type, ad);
nocode_wanted = saved_nocode_wanted;
} else {
static char kind[1024];
char *name = get_tok_str (*v, NULL);
type_to_str (kind, sizeof(kind), type, NULL);
//eprintf ("---%d %s STATIC %s\n", td, kind, name);
global_symname = name;
global_type = kind;
post_type(type, ad);
}
type->t |= storage;
if (tok == TOK_ATTRIBUTE1 || tok == TOK_ATTRIBUTE2)
parse_attribute(ad);
if (!type1->t) {
return;
}
/* append type at the end of type1 */
type2 = type1;
for(;;) {
s = type2->ref;
type2 = &s->type;
if (!type2->t) {
*type2 = *type;
break;
}
}
memcpy(type, type1, sizeof(*type));
}
/* compute the lvalue VT_LVAL_xxx needed to match type t. */
ST_FUNC int lvalue_type(int t)
{
int bt, r;
r = VT_LVAL;
bt = t & VT_BTYPE;
if (bt == VT_BYTE || bt == VT_BOOL)
r |= VT_LVAL_BYTE;
else if (bt == VT_SHORT)
r |= VT_LVAL_SHORT;
else
return r;
if (t & VT_UNSIGNED)
r |= VT_LVAL_UNSIGNED;
return r;
}
/* indirection with full error checking and bound check */
ST_FUNC void indir(void)
{
if ((vtop->type.t & VT_BTYPE) != VT_PTR) {
if ((vtop->type.t & VT_BTYPE) == VT_FUNC)
return;
expect("pointer");
}
vtop->type = *pointed_type(&vtop->type);
/* Arrays and functions are never lvalues */
if (!(vtop->type.t & VT_ARRAY) && !(vtop->type.t & VT_VLA)
&& (vtop->type.t & VT_BTYPE) != VT_FUNC) {
vtop->r |= lvalue_type(vtop->type.t);
/* if bound checking, the referenced pointer must be checked */
#ifdef CONFIG_TCC_BCHECK
if (tcc_state->do_bounds_check)
vtop->r |= VT_MUSTBOUND;
#endif
}
}
/* parse an expression of the form '(type)' or '(expr)' and return its
type */
static void parse_expr_type(CType *type)
{
int n;
AttributeDef ad;
skip('(');
if (parse_btype(type, &ad)) {
type_decl(type, &ad, &n, TYPE_ABSTRACT);
} else {
expr_type(type);
}
skip(')');
}
static void parse_type(CType *type)
{
AttributeDef ad;
int n;
if (!parse_btype(type, &ad)) {
expect("type");
}
type_decl(type, &ad, &n, TYPE_ABSTRACT);
}
static void vpush_tokc(int t)
{
CType type;
type.t = t;
type.ref = NULL;
vsetc(&type, VT_CONST, &tokc);
}
ST_FUNC void unary(void)
{
int n, t, align, size, r, sizeof_caller;
CType type;
Sym *s;
AttributeDef ad;
static int in_sizeof = 0;
sizeof_caller = in_sizeof;
in_sizeof = 0;
/* XXX: GCC 2.95.3 does not generate a table although it should be
better here */
tok_next:
switch(tok) {
case TOK_EXTENSION:
next();
goto tok_next;
case TOK_CINT:
case TOK_CCHAR:
case TOK_LCHAR:
vpushi(tokc.i);
next();
break;
case TOK_CUINT:
vpush_tokc(VT_INT | VT_UNSIGNED);
next();
break;
case TOK_CLLONG:
vpush_tokc(VT_LLONG);
next();
break;
case TOK_CULLONG:
vpush_tokc(VT_LLONG | VT_UNSIGNED);
next();
break;
case TOK_CFLOAT:
vpush_tokc(VT_FLOAT);
next();
break;
case TOK_CDOUBLE:
vpush_tokc(VT_DOUBLE);
next();
break;
case TOK_CLDOUBLE:
vpush_tokc(VT_LDOUBLE);
next();
break;
case TOK___FUNCTION__:
if (!gnu_ext)
goto tok_identifier;
/* fall thru */
case TOK___FUNC__:
{
// void *ptr = NULL;
int len;
/* special function name identifier */
len = strlen(funcname) + 1;
/* generate char[len] type */
type.t = VT_BYTE;
mk_pointer(&type);
type.t |= VT_ARRAY;
type.ref->c = len;
// XXX ptr is NULL HERE WTF
// memcpy(ptr, funcname, len);
next();
}
break;
case TOK_LSTR:
if (!strncmp(tcc_state->os, "windows", 7)) {
t = VT_SHORT | VT_UNSIGNED;
} else {
t = VT_INT;
}
goto str_init;
case TOK_STR:
/* string parsing */
t = VT_BYTE;
str_init:
if (tcc_state->warn_write_strings)
t |= VT_CONSTANT;
type.t = t;
mk_pointer(&type);
type.t |= VT_ARRAY;
memset(&ad, 0, sizeof(AttributeDef));
decl_initializer_alloc(&type, &ad, VT_CONST, 2, 0, NULL, 0);
break;
case '(':
next();
/* cast ? */
if (parse_btype(&type, &ad)) {
type_decl(&type, &ad, &n, 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 (!(type.t & VT_ARRAY))
r |= lvalue_type(type.t);
memset(&ad, 0, sizeof(AttributeDef));
decl_initializer_alloc(&type, &ad, r, 1, 0, NULL, 0);
} else {
if (sizeof_caller) {
vpush(&type);
return;
}
unary();
}
} else if (tok == '{') {
/* statement expression : we do not accept break/continue
inside as GCC does */
skip(')');
} else {
gexpr();
skip(')');
}
break;
case '*':
next();
unary();
indir();
break;
case '!':
next();
unary();
if ((vtop->r & VT_VALMASK) == VT_CMP)
vtop->c.i = vtop->c.i ^ 1;
break;
case TOK_SIZEOF:
case TOK_ALIGNOF1:
case TOK_ALIGNOF2:
t = tok;
next();
in_sizeof++;
unary_type(&type); // Perform a in_sizeof = 0;
size = type_size(&type, &align);
if (t == TOK_SIZEOF) {
if (!(type.t & VT_VLA)) {
if (size < 0)
tcc_error("sizeof applied to an incomplete type");
vpushs(size);
}
} else {
vpushs(align);
}
vtop->type.t |= VT_UNSIGNED;
break;
case TOK_builtin_types_compatible_p:
{
STACK_NEW0(CType, type1);
STACK_NEW0(CType, type2);
next();
skip('(');
parse_type(&type1);
skip(',');
parse_type(&type2);
skip(')');
type1.t &= ~(VT_CONSTANT | VT_VOLATILE);
type2.t &= ~(VT_CONSTANT | VT_VOLATILE);
vpushi(is_compatible_types(&type1, &type2));
}
break;
case TOK_builtin_constant_p:
{
int saved_nocode_wanted;
long long res;
next();
skip('(');
saved_nocode_wanted = nocode_wanted;
nocode_wanted = 1;
gexpr();
res = (vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) == VT_CONST;
nocode_wanted = saved_nocode_wanted;
skip(')');
vpushll(res);
}
break;
case TOK_builtin_frame_address:
{
int level;
CType type;
next();
skip('(');
if (tok != TOK_CINT || tokc.i < 0) {
tcc_error("__builtin_frame_address only takes positive integers");
}
level = tokc.i;
next();
skip(')');
type.t = VT_VOID;
mk_pointer(&type);
vset(&type, VT_LOCAL, 0); /* local frame */
while (level--) {
mk_pointer(&vtop->type);
indir(); /* -> parent frame */
}
}
break;
case TOK_builtin_va_start:
if (!strncmp(tcc_state->arch, "x86", 3) && tcc_state->bits == 64 &&
!strncmp(tcc_state->os, "windows", 7)) {
next();
skip('(');
expr_eq();
skip(',');
expr_eq();
skip(')');
if ((vtop->r & VT_VALMASK) != VT_LOCAL)
tcc_error("__builtin_va_start expects a local variable");
vtop->r &= ~(VT_LVAL | VT_REF);
vtop->type = char_pointer_type;
}
break;
case TOK_builtin_va_arg_types:
if (!(!strncmp(tcc_state->arch, "x86", 3) && tcc_state->bits == 64 &&
!strncmp(tcc_state->os, "windows", 7))) {
CType type;
next();
skip('(');
parse_type(&type);
skip(')');
// FIXME: Handle this too
//vpushll(classify_x86_64_va_arg(&type));
}
break;
// special qnan , snan and infinity values
case TOK___NAN__:
vpush64(VT_DOUBLE, 0x7ff8000000000000ULL);
next();
break;
case TOK___SNAN__:
vpush64(VT_DOUBLE, 0x7ff0000000000001ULL);
next();
break;
case TOK___INF__:
vpush64(VT_DOUBLE, 0x7ff0000000000000ULL);
next();
break;
default:
tok_identifier:
t = tok;
next();
if (t < TOK_UIDENT)
expect("identifier");
s = sym_find(t);
if (!s) {
if (tok != '(')
tcc_error("'%s' undeclared", get_tok_str(t, NULL));
}
if (!s) {
tcc_error("invalid declaration '%s'", get_tok_str(t, NULL));
}
if ((s->type.t & (VT_STATIC | VT_INLINE | VT_BTYPE)) ==
(VT_STATIC | VT_INLINE | VT_FUNC)) {
/* if referencing an inline function, then we generate a
symbol to it if not already done. It will have the
effect to generate code for it at the end of the
compilation unit. */
r = VT_SYM | VT_CONST;
} else {
r = s->r;
}
vset(&s->type, r, s->c);
/* if forward reference, we must point to s */
if (vtop->r & VT_SYM) {
vtop->sym = s;
vtop->c.ul = 0;
}
break;
}
/* post operations */
while (1) {
if (tok == '.' || tok == TOK_ARROW) {
int qualifiers;
/* field */
if (tok == TOK_ARROW)
indir();
qualifiers = vtop->type.t & (VT_CONSTANT | VT_VOLATILE);
test_lvalue();
gaddrof();
next();
/* expect pointer on structure */
if ((vtop->type.t & VT_BTYPE) != VT_STRUCT)
expect("struct or union");
s = vtop->type.ref;
/* find field */
tok |= SYM_FIELD;
while ((s = s->next) != NULL) {
if (s->v == tok)
break;
}
if (!s) {
tcc_error("field not found: %s", get_tok_str(tok & ~SYM_FIELD, NULL));
}
/* add field offset to pointer */
vtop->type = char_pointer_type; /* change type to 'char *' */
vpushi(s->c);
/* change type to field type, and set to lvalue */
vtop->type = s->type;
vtop->type.t |= qualifiers;
/* an array is never an lvalue */
if (!(vtop->type.t & VT_ARRAY)) {
vtop->r |= lvalue_type(vtop->type.t);
#ifdef CONFIG_TCC_BCHECK
/* if bound checking, the referenced pointer must be checked */
if (tcc_state->do_bounds_check)
vtop->r |= VT_MUSTBOUND;
#endif
}
next();
} else if (tok == '[') {
next();
gexpr();
indir();
skip(']');
/*
} else if (tok == '(') {
SValue ret;
Sym *sa;
int nb_args, sret;
*/
} else {
break;
}
}
}
ST_FUNC void expr_prod(void)
{
unary();
while (tok == '*' || tok == '/' || tok == '%') {
next();
unary();
}
}
ST_FUNC void expr_sum(void)
{
expr_prod();
while (tok == '+' || tok == '-') {
next();
expr_prod();
}
}
static void expr_shift(void)
{
expr_sum();
while (tok == TOK_SHL || tok == TOK_SAR) {
next();
expr_sum();
}
}
static void expr_cmp(void)
{
expr_shift();
while ((tok >= TOK_ULE && tok <= TOK_GT) ||
tok == TOK_ULT || tok == TOK_UGE) {
next();
expr_shift();
}
}
static void expr_cmpeq(void)
{
expr_cmp();
while (tok == TOK_EQ || tok == TOK_NE) {
next();
expr_cmp();
}
}
static void expr_and(void)
{
expr_cmpeq();
while (tok == '&') {
next();
expr_cmpeq();
}
}
static void expr_xor(void)
{
expr_and();
while (tok == '^') {
next();
expr_and();
}
}
static void expr_or(void)
{
expr_xor();
while (tok == '|') {
next();
expr_xor();
}
}
/* XXX: fix this mess */
static void expr_land_const(void)
{
expr_or();
while (tok == TOK_LAND) {
next();
expr_or();
}
}
/* XXX: fix this mess */
static void expr_lor_const(void)
{
expr_land_const();
while (tok == TOK_LOR) {
next();
expr_land_const();
}
}
/* only used if non constant */
static void expr_land(void)
{
expr_or();
if (tok == TOK_LAND) {
for(;;) {
if (tok != TOK_LAND) {
break;
}
next();
expr_or();
}
}
}
static void expr_lor(void)
{
expr_land();
if (tok == TOK_LOR) {
for(;;) {
if (tok != TOK_LOR) {
break;
}
next();
expr_land();
}
}
}
/* XXX: better constant handling */
static void expr_cond(void)
{
if (const_wanted) {
expr_lor_const();
if (tok == '?') {
vdup();
next();
if (tok != ':' || !gnu_ext) {
gexpr();
}
skip(':');
expr_cond();
}
} else {
expr_lor();
}
}
static void expr_eq(void)
{
int t;
expr_cond();
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();
}
}
}
ST_FUNC void gexpr(void)
{
while (1) {
expr_eq();
if (tok != ',')
break;
next();
}
}
/* parse an expression and return its type without any side effect. */
static void expr_type(CType *type)
{
int saved_nocode_wanted;
saved_nocode_wanted = nocode_wanted;
nocode_wanted = 1;
gexpr();
*type = vtop->type;
nocode_wanted = saved_nocode_wanted;
}
/* parse a unary expression and return its type without any side
effect. */
static void unary_type(CType *type)
{
int a;
a = nocode_wanted;
nocode_wanted = 1;
unary();
*type = vtop->type;
nocode_wanted = a;
}
/* parse a constant expression and return value in vtop. */
static void expr_const1(void)
{
int a;
a = const_wanted;
const_wanted = 1;
expr_cond();
const_wanted = a;
}
/* parse an integer constant and return its value. */
ST_FUNC long long expr_const(void)
{
long long c = 0LL;
expr_const1();
if ((vtop->r & (VT_VALMASK | VT_LVAL | VT_SYM)) != VT_CONST)
expect("constant expression");
c = vtop->c.ll;
return c;
}
/* return the label token if current token is a label, otherwise
return zero */
static int is_label(void)
{
int last_tok;
/* fast test first */
if (tok < TOK_UIDENT)
return 0;
/* no need to save tokc because tok is an identifier */
last_tok = tok;
next();
if (tok == ':') {
next();
return last_tok;
} else {
unget_tok(last_tok);
return 0;
}
}
/* 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) */
static void decl_designator(CType *type, unsigned long c,
long long *cur_index, Sym **cur_field,
int size_only)
{
Sym *s, *f = NULL;
long long index, index_last;
int notfirst, align, l, nb_elems, elem_size;
STACK_NEW0(CType, type1);
notfirst = 0;
if (gnu_ext && (l = is_label()) != 0)
goto struct_field;
while (tok == '[' || tok == '.') {
if (tok == '[') {
if (!(type->t & VT_ARRAY))
expect("array type");
s = type->ref;
next();
index = expr_const();
if (index < 0 || (s->c >= 0 && index >= s->c))
expect("invalid index");
if (tok == TOK_DOTS && gnu_ext) {
next();
index_last = expr_const();
if (index_last < 0 ||
(s->c >= 0 && index_last >= s->c) ||
index_last < index)
expect("invalid index");
} else {
index_last = index;
}
skip(']');
if (!notfirst)
*cur_index = index_last;
type = pointed_type(type);
elem_size = type_size(type, &align);
c += index * elem_size;
/* NOTE: we only support ranges for last designator */
nb_elems = index_last - index + 1;
if (nb_elems != 1) {
notfirst = 1;
break;
}
} else {
next();
l = tok;
next();
struct_field:
if ((type->t & VT_BTYPE) != VT_STRUCT)
expect("struct/union type");
s = type->ref;
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;
/* XXX: fix this mess by using explicit storage field */
if (f) {
type1 = f->type;
type1.t |= (type->t & ~VT_TYPE);
type = &type1;
c += f->c;
}
}
notfirst = 1;
}
if (notfirst) {
if (tok == '=') {
next();
} else {
if (!gnu_ext)
expect("=");
}
} else {
if (type->t & VT_ARRAY) {
index = *cur_index;
type = pointed_type(type);
c += index * type_size(type, &align);
} else {
f = *cur_field;
if (!f)
tcc_error("too many field init");
/* XXX: fix this mess by using explicit storage field */
if (f) {
type1 = f->type;
type1.t |= (type->t & ~VT_TYPE);
type = &type1;
c += f->c;
}
}
}
decl_initializer(type, 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 */
static void init_putv(CType *type, unsigned long c,
long long v, int expr_type)
{
int saved_global_expr;
CType dtype;
switch(expr_type) {
case EXPR_VAL:
vpushll(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;
/* NOTE: symbols are accepted */
if ((vtop->r & (VT_VALMASK | VT_LVAL)) != VT_CONST)
tcc_error("initializer element is not constant");
break;
case EXPR_ANY:
expr_eq();
break;
}
dtype = *type;
dtype.t &= ~VT_CONSTANT; /* need to do that to avoid false warning */
vset(&dtype, VT_LOCAL|VT_LVAL, c);
vswap();
}
/* put zeros for variable based init */
static void init_putz(CType *t, unsigned long c, int size)
{
vseti(VT_LOCAL, c);
vpushi(0);
vpushs(size);
}
/* 't' contains the type and storage info. 'c' is the offset of the
object in section 'sec'. If 'sec' is NULL, it means stack based
allocation. '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). */
static void decl_initializer(CType *type, unsigned long c,
int first, int size_only)
{
long long index;
int array_length, n, no_oblock, nb, parlevel, parlevel1, i;
int size1, align1, expr_type;
Sym *s, *f;
CType *t1;
if (type->t & VT_ARRAY) {
s = type->ref;
n = s->c;
array_length = 0;
t1 = pointed_type(type);
size1 = type_size(t1, &align1);
no_oblock = 1;
if ((first && tok != TOK_LSTR && tok != TOK_STR) ||
tok == '{') {
if (tok != '{')
tcc_error("character array initializer must be a literal,"
" optionally enclosed in braces");
skip('{');
no_oblock = 0;
}
/* only parse strings here if correct type (otherwise: handle
them as ((w)char *) expressions */
if ((tok == TOK_LSTR &&
/* FIXME: Handle platform here ! */
#ifdef TCC_TARGET_PE
(t1->t & VT_BTYPE) == VT_SHORT && (t1->t & VT_UNSIGNED)
#else
(t1->t & VT_BTYPE) == VT_INT
#endif
) || (tok == TOK_STR && (t1->t & VT_BTYPE) == VT_BYTE)) {
while (tok == TOK_STR || tok == TOK_LSTR) {
int cstr_len, ch;
CString *cstr;
cstr = tokc.cstr;
/* compute maximum number of chars wanted */
if (tok == TOK_STR)
cstr_len = cstr->size;
else
cstr_len = cstr->size / sizeof(nwchar_t);
cstr_len--;
nb = cstr_len;
if (n >= 0 && nb > (n - array_length))
nb = n - array_length;
if (!size_only) {
if (cstr_len > nb)
tcc_warning("initializer-string for array is too long");
/* in order to go faster for common case (char
string in global variable, we handle it
specifically */
for(i=0;i<nb;i++) {
if (tok == TOK_STR)
ch = ((unsigned char *)cstr->data)[i];
else
ch = ((nwchar_t *)cstr->data)[i];
init_putv(t1, c + (array_length + i) * size1,
ch, 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, c + (array_length * size1), 0, EXPR_VAL);
}
array_length++;
}
} else {
index = 0;
while (tok != '}') {
decl_designator(type, c, &index, NULL, size_only);
if (n >= 0 && index >= n)
tcc_error("index too large");
/* must put zero in holes (note that doing it that way
ensures that it even works with designators) */
if (!size_only && array_length < index) {
init_putz(t1, c + array_length * size1,
(index - array_length) * size1);
}
index++;
if (index > array_length)
array_length = index;
/* special test for multi dimensional arrays (may not
be strictly correct if designators are used at the
same time) */
if (index >= n && no_oblock)
break;
if (tok == '}')
break;
skip(',');
}
}
if (!no_oblock)
skip('}');
/* put zeros at the end */
if (!size_only && n >= 0 && array_length < n) {
init_putz(t1, c + array_length * size1,
(n - array_length) * size1);
}
/* patch type size if needed */
if (n < 0)
s->c = array_length;
} else if ((type->t & VT_BTYPE) == VT_STRUCT &&
(!first || tok == '{')) {
int par_count;
/* NOTE: the previous test is a specific case for automatic
struct/union init */
/* XXX: union needs only one init */
/* XXX: this test is incorrect for local initializers
beginning with ( without {. It would be much more difficult
to do it correctly (ideally, the expression parser should
be used in all cases) */
par_count = 0;
if (tok == '(') {
AttributeDef ad1;
STACK_NEW0(CType, type1);
next();
while (tok == '(') {
par_count++;
next();
}
if (!parse_btype(&type1, &ad1))
expect("cast");
type_decl(&type1, &ad1, &n, TYPE_ABSTRACT);
#if 0
if (!is_assignable_types(type, &type1))
tcc_error("invalid type for cast");
#endif
skip(')');
}
no_oblock = 1;
if (first || tok == '{') {
skip('{');
no_oblock = 0;
}
s = type->ref;
f = s->next;
array_length = 0;
index = 0;
n = s->c;
while (tok != '}') {
decl_designator(type, c, NULL, &f, size_only);
index = f->c;
if (!size_only && array_length < index) {
init_putz(type, c + array_length,
index - array_length);
}
index = index + type_size(&f->type, &align1);
if (index > array_length)
array_length = index;
/* gr: skip fields from same union - ugly. */
while (f->next) {
///printf("index: %2d %08x -- %2d %08x\n", f->c, f->type.t, f->next->c, f->next->type.t);
/* test for same offset */
if (f->next->c != f->c)
break;
/* if yes, test for bitfield shift */
if ((f->type.t & VT_BITFIELD) && (f->next->type.t & VT_BITFIELD)) {
int bit_pos_1 = (f->type.t >> VT_STRUCT_SHIFT) & 0x3f;
int bit_pos_2 = (f->next->type.t >> VT_STRUCT_SHIFT) & 0x3f;
//printf("bitfield %d %d\n", bit_pos_1, bit_pos_2);
if (bit_pos_1 != bit_pos_2)
break;
}
f = f->next;
}
f = f->next;
if (no_oblock && f == NULL)
break;
if (tok == '}')
break;
skip(',');
}
/* put zeros at the end */
if (!size_only && array_length < n) {
init_putz(type, c + array_length,
n - array_length);
}
if (!no_oblock)
skip('}');
while (par_count) {
skip(')');
par_count--;
}
} else if (tok == '{') {
next();
decl_initializer(type, c, first, size_only);
skip('}');
} else if (size_only) {
/* just skip expression */
parlevel = parlevel1 = 0;
while ((parlevel > 0 || parlevel1 > 0 ||
(tok != '}' && tok != ',')) && tok != -1) {
if (tok == '(')
parlevel++;
else if (tok == ')')
parlevel--;
else if (tok == '{')
parlevel1++;
else if (tok == '}')
parlevel1--;
next();
}
} else {
/* currently, we always use constant expression for globals
(may change for scripting case) */
expr_type = EXPR_CONST;
init_putv(type, c, 0, expr_type);
}
}
/* parse an initializer for type 't' if 'has_init' is non zero, and
allocate space in local or global data space ('r' is either
VT_LOCAL or VT_CONST). If 'v' is non zero, then an associated
variable 'v' with an associated name represented by 'asm_label' of
scope 'scope' is declared before initializers are parsed. If 'v' is
zero, then a reference to the new object is put in the value stack.
If 'has_init' is 2, a special parsing is done to handle string
constants. */
static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
int has_init, int v, char *asm_label,
int scope)
{
int size, align, addr;
int level;
ParseState saved_parse_state = {0};
TokenString init_str;
Sym *flexible_array;
flexible_array = NULL;
if ((type->t & VT_BTYPE) == VT_STRUCT) {
Sym *field;
field = type->ref;
while (field && field->next)
field = field->next;
if (field->type.t & VT_ARRAY && field->type.ref->c < 0)
flexible_array = field;
}
size = type_size(type, &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 */
tok_str_new(&init_str);
if (size < 0 || (flexible_array && has_init)) {
if (!has_init)
tcc_error("unknown type size");
/* get all init string */
if (has_init == 2) {
/* only get strings */
while (tok == TOK_STR || tok == TOK_LSTR) {
tok_str_add_tok(&init_str);
next();
}
} else {
level = 0;
while (level > 0 || (tok != ',' && tok != ';')) {
if (tok < 0)
tcc_error("unexpected end of file in initializer");
tok_str_add_tok(&init_str);
if (tok == '{')
level++;
else if (tok == '}') {
level--;
if (level <= 0) {
next();
break;
}
}
next();
}
}
tok_str_add(&init_str, -1);
tok_str_add(&init_str, 0);
/* compute size */
save_parse_state(&saved_parse_state);
macro_ptr = init_str.str;
next();
decl_initializer(type, 0, 1, 1);
/* prepare second initializer parsing */
macro_ptr = init_str.str;
next();
/* if still unknown size, error */
size = type_size(type, &align);
if (size < 0)
tcc_error("unknown type size");
}
if (flexible_array)
size += flexible_array->type.ref->c * pointed_size(&flexible_array->type);
/* take into account specified alignment if bigger */
if (ad->aligned) {
if (ad->aligned > align)
align = ad->aligned;
} else if (ad->packed) {
align = 1;
}
if ((r & VT_VALMASK) == VT_LOCAL) {
loc = (loc - size) & -align;
addr = loc;
if (v) {
/* local variable */
sym_push(v, type, r, addr);
} else {
/* push local reference */
vset(type, r, addr);
}
} else {
Sym *sym;
sym = NULL;
if (v && scope == VT_CONST) {
/* see if the symbol was already defined */
sym = sym_find(v);
if (sym) {
if (!is_compatible_types(&sym->type, type))
tcc_error("incompatible types for redefinition of '%s'",
get_tok_str(v, NULL));
if (sym->type.t & VT_EXTERN) {
/* if the variable is extern, it was not allocated */
sym->type.t &= ~VT_EXTERN;
/* set array size if it was ommited in extern
declaration */
if ((sym->type.t & VT_ARRAY) &&
sym->type.ref->c < 0 &&
type->ref->c >= 0)
sym->type.ref->c = type->ref->c;
} else {
/* we accept several definitions of the same
global variable. this is tricky, because we
must play with the SHN_COMMON type of the symbol */
/* XXX: should check if the variable was already
initialized. It is incorrect to initialized it
twice */
/* no init data, we won't add more to the symbol */
if (!has_init)
goto no_alloc;
}
}
}
if (v) {
if (scope != VT_CONST || !sym) {
sym = sym_push(v, type, r | VT_SYM, 0);
sym->asm_label = asm_label;
}
} else {
CValue cval;
cval.ul = 0;
vsetc(type, VT_CONST | VT_SYM, &cval);
vtop->sym = sym;
}
/* patch symbol weakness */
if ((type->t & VT_WEAK) && sym)
weaken_symbol(sym);
}
no_alloc: ;
}
/* parse an old style function declaration list */
/* XXX: check multiple parameter */
static void func_decl_list(Sym *func_sym)
{
AttributeDef ad;
int v;
Sym *s = NULL;
CType btype, type;
/* parse each declaration */
while (tok != '{' && tok != ';' && tok != ',' && tok != TOK_EOF &&
tok != TOK_ASM1 && tok != TOK_ASM2 && tok != TOK_ASM3) {
if (!parse_btype(&btype, &ad))
expect("declaration list");
if (((btype.t & VT_BTYPE) == VT_ENUM ||
(btype.t & VT_BTYPE) == VT_STRUCT) &&
tok == ';') {
/* we accept no variable after */
} else {
for(;;) {
type = btype;
type_decl(&type, &ad, &v, TYPE_DIRECT);
/* find parameter in function parameter list */
s = func_sym->next;
while (s != NULL) {
if ((s->v & ~SYM_FIELD) == v)
goto found;
s = s->next;
}
tcc_error("declaration for parameter '%s' but no such parameter",
get_tok_str(v, NULL));
found:
/* check that no storage specifier except 'register' was given */
if (type.t & VT_STORAGE)
tcc_error("storage class specified for '%s'", get_tok_str(v, NULL));
convert_parameter_type(&type);
/* we can add the type (NOTE: it could be local to the function) */
if (s) {
s->type = type;
}
/* accept other parameters */
if (tok == ',')
next();
else
break;
}
}
skip(';');
}
}
/* 'l' is VT_LOCAL or VT_CONST to define default storage type */
static int decl0(int l, int is_for_loop_init)
{
int v, has_init, r;
CType type, btype;
Sym *sym;
AttributeDef ad;
for (;;) {
if (!parse_btype(&btype, &ad)) {
if (is_for_loop_init)
return 0;
/* skip redundant ';' */
/* XXX: find more elegant solution */
if (tok == ';') {
next();
continue;
}
if (l == VT_CONST &&
(tok == TOK_ASM1 || tok == TOK_ASM2 || tok == TOK_ASM3)) {
/* global asm block */
#if 1
eprintf ("global asm not supported\n");
return 1;
#endif
//asm_global_instr();
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;
btype.t = VT_INT;
}
if (((btype.t & VT_BTYPE) == VT_ENUM ||
(btype.t & VT_BTYPE) == VT_STRUCT) &&
tok == ';') {
/* we accept no variable after */
next();
continue;
}
while (1) { /* iterate thru each declaration */
type = btype;
type_decl(&type, &ad, &v, 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 ((type.t & VT_BTYPE) == VT_FUNC) {
if ((type.t & VT_STATIC) && (l == VT_LOCAL)) {
tcc_error("function without file scope cannot be static");
}
/* if old style function prototype, we accept a
declaration list */
sym = type.ref;
if (sym->c == FUNC_OLD)
func_decl_list(sym);
}
if (ad.weak)
type.t |= VT_WEAK;
#ifdef TCC_TARGET_PE
if (ad.func_import)
type.t |= VT_IMPORT;
if (ad.func_export)
type.t |= VT_EXPORT;
#endif
if (tok == '{') {
if (l == VT_LOCAL)
tcc_error("cannot use local functions");
if ((type.t & VT_BTYPE) != VT_FUNC)
expect("function definition");
/* reject abstract declarators in function definition */
sym = type.ref;
while ((sym = sym->next) != NULL)
if (!(sym->v & ~SYM_FIELD))
expect("identifier");
/* XXX: cannot do better now: convert extern line to static inline */
if ((type.t & (VT_EXTERN | VT_INLINE)) == (VT_EXTERN | VT_INLINE))
type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
sym = sym_find(v);
if (sym) {
if ((sym->type.t & VT_BTYPE) != VT_FUNC)
goto func_error1;
r = sym->type.ref->r;
/* use func_call from prototype if not defined */
if (FUNC_CALL(r) != FUNC_CDECL
&& FUNC_CALL(type.ref->r) == FUNC_CDECL)
FUNC_CALL(type.ref->r) = FUNC_CALL(r);
/* use export from prototype */
if (FUNC_EXPORT(r))
FUNC_EXPORT(type.ref->r) = 1;
/* use static from prototype */
if (sym->type.t & VT_STATIC)
type.t = (type.t & ~VT_EXTERN) | VT_STATIC;
if (!is_compatible_types(&sym->type, &type)) {
func_error1:
tcc_error("incompatible types for redefinition of '%s'",
get_tok_str(v, NULL));
}
/* if symbol is already defined, then put complete type */
sym->type = type;
} else {
/* put function symbol */
sym = global_identifier_push(v, type.t, 0);
sym->type.ref = type.ref;
}
break;
} else {
if (btype.t & VT_TYPEDEF) {
/* save typedefed type */
/* XXX: test storage specifiers ? */
sym = sym_push(v, &type, INT_ATTR(&ad), 0);
sym->type.t |= VT_TYPEDEF;
} else {
r = 0;
if ((type.t & VT_BTYPE) == VT_FUNC) {
/* external function definition */
/* specific case for func_call attribute */
type.ref->r = INT_ATTR(&ad);
} else if (!(type.t & VT_ARRAY)) {
/* not lvalue if array */
r |= lvalue_type(type.t);
}
has_init = (tok == '=');
if (has_init && (type.t & VT_VLA))
tcc_error("Variable length array cannot be initialized");
}
if (tok != ',') {
if (is_for_loop_init)
return 1;
skip(';');
break;
}
next();
}
ad.aligned = 0;
}
}
return 0;
}
ST_FUNC void decl(int l)
{
decl0(l, 0);
}
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