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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
*/
#define USING_GLOBALS
#include "tcc.h"
/********************************************************/
/* 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 *global_stack;
ST_DATA Sym *local_stack;
ST_DATA Sym *define_stack;
ST_DATA Sym *global_label_stack;
ST_DATA Sym *local_label_stack;
static Sym *sym_free_first;
static void **sym_pools;
static int nb_sym_pools;
static Sym *all_cleanups, *pending_gotos;
static int local_scope;
static int in_sizeof;
static int in_generic;
ST_DATA SValue *vtop;
static SValue _vstack[1 + VSTACK_SIZE];
#define vstack (_vstack + 1)
ST_DATA int const_wanted; /* true if constant wanted */
ST_DATA int nocode_wanted; /* no code generation wanted */
#define unevalmask 0xffff /* unevaluated subexpression */
#define NODATA_WANTED (nocode_wanted > 0) /* no static data output wanted either */
#define STATIC_DATA_WANTED (nocode_wanted & 0xC0000000) /* only static data output */
/* Automagical code suppression ----> */
#define CODE_OFF() (nocode_wanted |= 0x20000000)
#define CODE_ON() (nocode_wanted &= ~0x20000000)
/* Clear 'nocode_wanted' at label if it was used */
ST_FUNC void gsym(int t) { if (t) { gsym_addr(t, ind); CODE_ON(); }}
static int gind(void) { int t = ind; CODE_ON(); return t; }
/* Set 'nocode_wanted' after unconditional jumps */
static void gjmp_addr_acs(int t) { gjmp_addr(t); CODE_OFF(); }
static int gjmp_acs(int t) { t = gjmp(t); CODE_OFF(); return t; }
/* These are #undef'd at the end of this file */
#define gjmp_addr gjmp_addr_acs
#define gjmp gjmp_acs
/* <---- */
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_var; /* true if current function is variadic (used by return instruction) */
ST_DATA int func_vc;
ST_DATA int func_ind;
ST_DATA const char *funcname;
ST_DATA CType int_type, func_old_type, char_type, char_pointer_type;
static CString initstr;
#if PTR_SIZE == 4
#define VT_SIZE_T (VT_INT | VT_UNSIGNED)
#define VT_PTRDIFF_T VT_INT
#elif LONG_SIZE == 4
#define VT_SIZE_T (VT_LLONG | VT_UNSIGNED)
#define VT_PTRDIFF_T VT_LLONG
#else
#define VT_SIZE_T (VT_LONG | VT_LLONG | VT_UNSIGNED)
#define VT_PTRDIFF_T (VT_LONG | VT_LLONG)
#endif
static struct switch_t {
struct case_t {
int64_t v1, v2;
int sym;
} **p; int n; /* list of case ranges */
int def_sym; /* default symbol */
int *bsym;
struct scope *scope;
struct switch_t *prev;
SValue sv;
} *cur_switch; /* current switch */
#define MAX_TEMP_LOCAL_VARIABLE_NUMBER 8
/*list of temporary local variables on the stack in current function. */
static struct temp_local_variable {
int location; //offset on stack. Svalue.c.i
short size;
short align;
} arr_temp_local_vars[MAX_TEMP_LOCAL_VARIABLE_NUMBER];
static int nb_temp_local_vars;
static struct scope {
struct scope *prev;
struct { int loc, locorig, num; } vla;
struct { Sym *s; int n; } cl;
int *bsym, *csym;
Sym *lstk, *llstk;
} *cur_scope, *loop_scope, *root_scope;
typedef struct {
Section *sec;
int local_offset;
Sym *flex_array_ref;
} init_params;
#if 1
#define precedence_parser
static void init_prec(void);
#endif
static void gen_cast(CType *type);
static void gen_cast_s(int t);
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 CType *type_decl(CType *type, AttributeDef *ad, int *v, int td);
static void parse_expr_type(CType *type);
static void init_putv(init_params *p, CType *type, unsigned long c);
static void decl_initializer(init_params *p, CType *type, unsigned long c, int flags);
static void block(int is_expr);
static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r, int has_init, int v, int scope);
static void decl(int l);
static int decl0(int l, int is_for_loop_init, Sym *);
static void expr_eq(void);
static void vpush_type_size(CType *type, int *a);
static int is_compatible_unqualified_types(CType *type1, CType *type2);
static inline int64_t expr_const64(void);
static void vpush64(int ty, unsigned long long v);
static void vpush(CType *type);
static int gvtst(int inv, int t);
static void gen_inline_functions(TCCState *s);
static void free_inline_functions(TCCState *s);
static void skip_or_save_block(TokenString **str);
static void gv_dup(void);
static int get_temp_local_var(int size,int align);
static void clear_temp_local_var_list();
static void cast_error(CType *st, CType *dt);
/* ------------------------------------------------------------------------- */
ST_INLN int is_float(int t)
{
int bt = t & VT_BTYPE;
return bt == VT_LDOUBLE
|| bt == VT_DOUBLE
|| bt == VT_FLOAT
|| bt == VT_QFLOAT;
}
static inline int is_integer_btype(int bt)
{
return bt == VT_BYTE
|| bt == VT_BOOL
|| bt == VT_SHORT
|| bt == VT_INT
|| bt == VT_LLONG;
}
static int btype_size(int bt)
{
return bt == VT_BYTE || bt == VT_BOOL ? 1 :
bt == VT_SHORT ? 2 :
bt == VT_INT ? 4 :
bt == VT_LLONG ? 8 :
bt == VT_PTR ? PTR_SIZE : 0;
}
/* returns function return register from type */
static int R_RET(int t)
{
if (!is_float(t))
return REG_IRET;
#ifdef TCC_TARGET_X86_64
if ((t & VT_BTYPE) == VT_LDOUBLE)
return TREG_ST0;
#elif defined TCC_TARGET_RISCV64
if ((t & VT_BTYPE) == VT_LDOUBLE)
return REG_IRET;
#endif
return REG_FRET;
}
/* returns 2nd function return register, if any */
static int R2_RET(int t)
{
t &= VT_BTYPE;
#if PTR_SIZE == 4
if (t == VT_LLONG)
return REG_IRE2;
#elif defined TCC_TARGET_X86_64
if (t == VT_QLONG)
return REG_IRE2;
if (t == VT_QFLOAT)
return REG_FRE2;
#elif defined TCC_TARGET_RISCV64
if (t == VT_LDOUBLE)
return REG_IRE2;
#endif
return VT_CONST;
}
/* returns true for two-word types */
#define USING_TWO_WORDS(t) (R2_RET(t) != VT_CONST)
/* put function return registers to stack value */
static void PUT_R_RET(SValue *sv, int t)
{
sv->r = R_RET(t), sv->r2 = R2_RET(t);
}
/* returns function return register class for type t */
static int RC_RET(int t)
{
return reg_classes[R_RET(t)] & ~(RC_FLOAT | RC_INT);
}
/* returns generic register class for type t */
static int RC_TYPE(int t)
{
if (!is_float(t))
return RC_INT;
#ifdef TCC_TARGET_X86_64
if ((t & VT_BTYPE) == VT_LDOUBLE)
return RC_ST0;
if ((t & VT_BTYPE) == VT_QFLOAT)
return RC_FRET;
#elif defined TCC_TARGET_RISCV64
if ((t & VT_BTYPE) == VT_LDOUBLE)
return RC_INT;
#endif
return RC_FLOAT;
}
/* returns 2nd register class corresponding to t and rc */
static int RC2_TYPE(int t, int rc)
{
if (!USING_TWO_WORDS(t))
return 0;
#ifdef RC_IRE2
if (rc == RC_IRET)
return RC_IRE2;
#endif
#ifdef RC_FRE2
if (rc == RC_FRET)
return RC_FRE2;
#endif
if (rc & RC_FLOAT)
return RC_FLOAT;
return RC_INT;
}
/* 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[4];
memcpy(p, &d, sizeof(double));
return ((unsigned)((p[1] | 0x800fffff) + 1)) >> 31;
}
/* compiling intel long double natively */
#if (defined __i386__ || defined __x86_64__) \
&& (defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64)
# define TCC_IS_NATIVE_387
#endif
ST_FUNC void test_lvalue(void)
{
if (!(vtop->r & VT_LVAL))
expect("lvalue");
}
ST_FUNC void check_vstack(void)
{
if (vtop != vstack - 1)
tcc_error("internal compiler error: vstack leak (%d)",
(int)(vtop - vstack + 1));
}
/* vstack debugging aid */
#if 0
void pv (const char *lbl, int a, int b)
{
int i;
for (i = a; i < a + b; ++i) {
SValue *p = &vtop[-i];
printf("%s vtop[-%d] : type.t:%04x r:%04x r2:%04x c.i:%d\n",
lbl, i, p->type.t, p->r, p->r2, (int)p->c.i);
}
}
#endif
/* ------------------------------------------------------------------------- */
/* initialize vstack and types. This must be done also for tcc -E */
ST_FUNC void tccgen_init(TCCState *s1)
{
vtop = vstack - 1;
memset(vtop, 0, sizeof *vtop);
/* define some often used types */
int_type.t = VT_INT;
char_type.t = VT_BYTE;
if (s1->char_is_unsigned)
char_type.t |= VT_UNSIGNED;
char_pointer_type = char_type;
mk_pointer(&char_pointer_type);
func_old_type.t = VT_FUNC;
func_old_type.ref = sym_push(SYM_FIELD, &int_type, 0, 0);
func_old_type.ref->f.func_call = FUNC_CDECL;
func_old_type.ref->f.func_type = FUNC_OLD;
#ifdef precedence_parser
init_prec();
#endif
cstr_new(&initstr);
}
ST_FUNC int tccgen_compile(TCCState *s1)
{
cur_text_section = NULL;
funcname = "";
func_ind = -1;
anon_sym = SYM_FIRST_ANOM;
const_wanted = 0;
nocode_wanted = 0x80000000;
local_scope = 0;
#ifdef TCC_TARGET_ARM
arm_init(s1);
#endif
#ifdef INC_DEBUG
printf("%s: **** new file\n", file->filename);
#endif
parse_flags = PARSE_FLAG_PREPROCESS | PARSE_FLAG_TOK_NUM | PARSE_FLAG_TOK_STR;
next();
decl(VT_CONST);
gen_inline_functions(s1);
check_vstack();
/* end of translation unit info */
return 0;
}
ST_FUNC void tccgen_finish(TCCState *s1)
{
cstr_free(&initstr);
free_inline_functions(s1);
sym_pop(&global_stack, NULL, 0);
sym_pop(&local_stack, NULL, 0);
/* free preprocessor macros */
free_defines(NULL);
/* free sym_pools */
dynarray_reset(&sym_pools, &nb_sym_pools);
sym_free_first = NULL;
global_label_stack = local_label_stack = NULL;
}
/* ------------------------------------------------------------------------- */
ST_FUNC ElfSym *elfsym(Sym *s)
{
if (!s || !s->c)
return NULL;
return &((ElfSym *)symtab_section->data)[s->c];
}
/* apply storage attributes to Elf symbol */
ST_FUNC void update_storage(Sym *sym)
{
ElfSym *esym;
int sym_bind, old_sym_bind;
esym = elfsym(sym);
if (!esym)
return;
if (sym->a.visibility)
esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
| sym->a.visibility;
if (sym->type.t & (VT_STATIC | VT_INLINE))
sym_bind = STB_LOCAL;
else if (sym->a.weak)
sym_bind = STB_WEAK;
else
sym_bind = STB_GLOBAL;
old_sym_bind = ELFW(ST_BIND)(esym->st_info);
if (sym_bind != old_sym_bind) {
esym->st_info = ELFW(ST_INFO)(sym_bind, ELFW(ST_TYPE)(esym->st_info));
}
#if 0
printf("storage %s: bind=%c vis=%d exp=%d imp=%d\n",
get_tok_str(sym->v, NULL),
sym_bind == STB_WEAK ? 'w' : sym_bind == STB_LOCAL ? 'l' : 'g',
sym->a.visibility,
sym->a.dllexport,
sym->a.dllimport
);
#endif
}
/* ------------------------------------------------------------------------- */
/* update sym->c so that it points to an external symbol in section
'section' with value 'value' */
ST_FUNC void put_extern_sym2(Sym *sym, int sh_num,
addr_t value, unsigned long size,
int can_add_underscore)
{
int sym_type, sym_bind, info, other, t;
ElfSym *esym;
const char *name;
char buf1[256];
if (!sym->c) {
name = get_tok_str(sym->v, NULL);
t = sym->type.t;
if ((t & VT_BTYPE) == VT_FUNC) {
sym_type = STT_FUNC;
} else if ((t & VT_BTYPE) == VT_VOID) {
sym_type = STT_NOTYPE;
if ((t & (VT_BTYPE|VT_ASM_FUNC)) == VT_ASM_FUNC)
sym_type = STT_FUNC;
} else {
sym_type = STT_OBJECT;
}
if (t & (VT_STATIC | VT_INLINE))
sym_bind = STB_LOCAL;
else
sym_bind = STB_GLOBAL;
other = 0;
if (sym->asm_label) {
name = get_tok_str(sym->asm_label, NULL);
can_add_underscore = 0;
}
if (tcc_state->leading_underscore && can_add_underscore) {
buf1[0] = '_';
pstrcpy(buf1 + 1, sizeof(buf1) - 1, name);
name = buf1;
}
info = ELFW(ST_INFO)(sym_bind, sym_type);
sym->c = put_elf_sym(symtab_section, value, size, info, other, sh_num, name);
} else {
esym = elfsym(sym);
esym->st_value = value;
esym->st_size = size;
esym->st_shndx = sh_num;
}
update_storage(sym);
}
ST_FUNC void put_extern_sym(Sym *sym, Section *s, addr_t value, unsigned long size)
{
if (nocode_wanted && (NODATA_WANTED || (s && s == cur_text_section)))
return;
put_extern_sym2(sym, s ? s->sh_num : SHN_UNDEF, value, size, 1);
}
/* add a new relocation entry to symbol 'sym' in section 's' */
ST_FUNC void greloca(Section *s, Sym *sym, unsigned long offset, int type,
addr_t addend)
{
int c = 0;
if (nocode_wanted && s == cur_text_section)
return;
if (sym) {
if (0 == sym->c)
put_extern_sym(sym, NULL, 0, 0);
c = sym->c;
}
/* now we can add ELF relocation info */
put_elf_reloca(symtab_section, s, offset, type, c, addend);
}
#if PTR_SIZE == 4
ST_FUNC void greloc(Section *s, Sym *sym, unsigned long offset, int type)
{
greloca(s, sym, offset, type, 0);
}
#endif
/* ------------------------------------------------------------------------- */
/* symbol allocator */
static Sym *__sym_malloc(void)
{
Sym *sym_pool, *sym, *last_sym;
int i;
sym_pool = tcc_malloc(SYM_POOL_NB * sizeof(Sym));
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;
#ifndef SYM_DEBUG
sym = sym_free_first;
if (!sym)
sym = __sym_malloc();
sym_free_first = sym->next;
return sym;
#else
sym = tcc_malloc(sizeof(Sym));
return sym;
#endif
}
ST_INLN void sym_free(Sym *sym)
{
#ifndef SYM_DEBUG
sym->next = sym_free_first;
sym_free_first = sym;
#else
tcc_free(sym);
#endif
}
/* push, without hashing */
ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, int c)
{
Sym *s;
s = sym_malloc();
memset(s, 0, sizeof *s);
s->v = v;
s->type.t = t;
s->c = c;
/* 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;
else if (s->v == -1)
return NULL;
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;
}
static int sym_scope(Sym *s)
{
if (IS_ENUM_VAL (s->type.t))
return s->type.ref->sym_scope;
else
return s->sym_scope;
}
/* push a given symbol on the symbol stack */
ST_FUNC Sym *sym_push(int v, CType *type, int r, int c)
{
Sym *s, **ps;
TokenSym *ts;
if (local_stack)
ps = &local_stack;
else
ps = &global_stack;
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;
s->sym_scope = local_scope;
if (s->prev_tok && sym_scope(s->prev_tok) == s->sym_scope)
tcc_error("redeclaration of '%s'",
get_tok_str(v & ~SYM_STRUCT, NULL));
}
return s;
}
/* push a global identifier */
ST_FUNC Sym *global_identifier_push(int v, int t, int c)
{
Sym *s, **ps;
s = sym_push2(&global_stack, v, t, c);
s->r = VT_CONST | VT_SYM;
/* 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; happens when called from inline asm */
while (*ps != NULL && (*ps)->sym_scope)
ps = &(*ps)->prev_tok;
s->prev_tok = *ps;
*ps = s;
}
return s;
}
/* pop symbols until top reaches 'b'. If KEEP is non-zero don't really
pop them yet from the list, but do remove them from the token array. */
ST_FUNC void sym_pop(Sym **ptop, Sym *b, int keep)
{
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;
}
if (!keep)
sym_free(s);
s = ss;
}
if (!keep)
*ptop = b;
}
/* ------------------------------------------------------------------------- */
static void vcheck_cmp(void)
{
/* 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.
Don't do this when nocode_wanted. vtop might come from
!nocode_wanted regions (see 88_codeopt.c) and transforming
it to a register without actually generating code is wrong
as their value might still be used for real. All values
we push under nocode_wanted will eventually be popped
again, so that the VT_CMP/VT_JMP value will be in vtop
when code is unsuppressed again. */
if (vtop->r == VT_CMP && !nocode_wanted)
gv(RC_INT);
}
static void vsetc(CType *type, int r, CValue *vc)
{
if (vtop >= vstack + (VSTACK_SIZE - 1))
tcc_error("memory full (vstack)");
vcheck_cmp();
vtop++;
vtop->type = *type;
vtop->r = r;
vtop->r2 = VT_CONST;
vtop->c = *vc;
vtop->sym = NULL;
}
ST_FUNC void vswap(void)
{
SValue tmp;
vcheck_cmp();
tmp = vtop[0];
vtop[0] = vtop[-1];
vtop[-1] = tmp;
}
/* pop stack value */
ST_FUNC void vpop(void)
{
int v;
v = vtop->r & VT_VALMASK;
#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
/* for x86, we need to pop the FP stack */
if (v == TREG_ST0) {
o(0xd8dd); /* fstp %st(0) */
} else
#endif
if (v == VT_CMP) {
/* need to put correct jump if && or || without test */
gsym(vtop->jtrue);
gsym(vtop->jfalse);
}
vtop--;
}
/* push constant of type "type" with useless value */
static void vpush(CType *type)
{
vset(type, VT_CONST, 0);
}
/* push arbitrary 64bit constant */
static void vpush64(int ty, unsigned long long v)
{
CValue cval;
CType ctype;
ctype.t = ty;
ctype.ref = NULL;
cval.i = v;
vsetc(&ctype, VT_CONST, &cval);
}
/* push integer constant */
ST_FUNC void vpushi(int v)
{
vpush64(VT_INT, v);
}
/* push a pointer sized constant */
static void vpushs(addr_t v)
{
vpush64(VT_SIZE_T, v);
}
/* push long long constant */
static inline void vpushll(long long v)
{
vpush64(VT_LLONG, v);
}
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 vpushv(SValue *v)
{
if (vtop >= vstack + (VSTACK_SIZE - 1))
tcc_error("memory full (vstack)");
vtop++;
*vtop = *v;
}
static void vdup(void)
{
vpushv(vtop);
}
/* rotate n first stack elements to the bottom
I1 ... In -> I2 ... In I1 [top is right]
*/
ST_FUNC void vrotb(int n)
{
int i;
SValue tmp;
vcheck_cmp();
tmp = vtop[-n + 1];
for(i=-n+1;i!=0;i++)
vtop[i] = vtop[i+1];
vtop[0] = tmp;
}
/* rotate the n elements before entry e towards the top
I1 ... In ... -> In I1 ... I(n-1) ... [top is right]
*/
ST_FUNC void vrote(SValue *e, int n)
{
int i;
SValue tmp;
vcheck_cmp();
tmp = *e;
for(i = 0;i < n - 1; i++)
e[-i] = e[-i - 1];
e[-n + 1] = tmp;
}
/* rotate n first stack elements to the top
I1 ... In -> In I1 ... I(n-1) [top is right]
*/
ST_FUNC void vrott(int n)
{
vrote(vtop, n);
}
/* ------------------------------------------------------------------------- */
/* vtop->r = VT_CMP means CPU-flags have been set from comparison or test. */
/* called from generators to set the result from relational ops */
ST_FUNC void vset_VT_CMP(int op)
{
vtop->r = VT_CMP;
vtop->cmp_op = op;
vtop->jfalse = 0;
vtop->jtrue = 0;
}
/* called once before asking generators to load VT_CMP to a register */
static void vset_VT_JMP(void)
{
int op = vtop->cmp_op;
if (vtop->jtrue || vtop->jfalse) {
int origt = vtop->type.t;
/* we need to jump to 'mov $0,%R' or 'mov $1,%R' */
int inv = op & (op < 2); /* small optimization */
vseti(VT_JMP+inv, gvtst(inv, 0));
vtop->type.t = origt;
} else {
/* otherwise convert flags (rsp. 0/1) to register */
vtop->c.i = op;
if (op < 2) /* doesn't seem to happen */
vtop->r = VT_CONST;
}
}
/* Set CPU Flags, doesn't yet jump */
static void gvtst_set(int inv, int t)
{
int *p;
if (vtop->r != VT_CMP) {
vpushi(0);
gen_op(TOK_NE);
if (vtop->r != VT_CMP) /* must be VT_CONST then */
vset_VT_CMP(vtop->c.i != 0);
}
p = inv ? &vtop->jfalse : &vtop->jtrue;
*p = gjmp_append(*p, t);
}
/* Generate value test
*
* Generate a test for any value (jump, comparison and integers) */
static int gvtst(int inv, int t)
{
int op, x, u;
gvtst_set(inv, t);
t = vtop->jtrue, u = vtop->jfalse;
if (inv)
x = u, u = t, t = x;
op = vtop->cmp_op;
/* jump to the wanted target */
if (op > 1)
t = gjmp_cond(op ^ inv, t);
else if (op != inv)
t = gjmp(t);
/* resolve complementary jumps to here */
gsym(u);
vtop--;
return t;
}
/* generate a zero or nozero test */
static void gen_test_zero(int op)
{
if (vtop->r == VT_CMP) {
int j;
if (op == TOK_EQ) {
j = vtop->jfalse;
vtop->jfalse = vtop->jtrue;
vtop->jtrue = j;
vtop->cmp_op ^= 1;
}
} else {
vpushi(0);
gen_op(op);
}
}
/* ------------------------------------------------------------------------- */
/* push a symbol value of TYPE */
ST_FUNC void vpushsym(CType *type, Sym *sym)
{
CValue cval;
cval.i = 0;
vsetc(type, VT_CONST | VT_SYM, &cval);
vtop->sym = sym;
}
/* Return a static symbol pointing to a section */
ST_FUNC Sym *get_sym_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
{
int v;
Sym *sym;
v = anon_sym++;
sym = sym_push(v, type, VT_CONST | VT_SYM, 0);
sym->type.t |= VT_STATIC;
put_extern_sym(sym, sec, offset, size);
return sym;
}
/* push a reference to a section offset by adding a dummy symbol */
static void vpush_ref(CType *type, Section *sec, unsigned long offset, unsigned long size)
{
vpushsym(type, get_sym_ref(type, sec, offset, size));
}
/* define a new external reference to a symbol 'v' of type 'u' */
ST_FUNC Sym *external_global_sym(int v, CType *type)
{
Sym *s;
s = sym_find(v);
if (!s) {
/* push forward reference */
s = global_identifier_push(v, type->t | VT_EXTERN, 0);
s->type.ref = type->ref;
} else if (IS_ASM_SYM(s)) {
s->type.t = type->t | (s->type.t & VT_EXTERN);
s->type.ref = type->ref;
update_storage(s);
}
return s;
}
/* create an external reference with no specific type similar to asm labels.
This avoids type conflicts if the symbol is used from C too */
ST_FUNC Sym *external_helper_sym(int v)
{