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Remove VT_REF

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The canonical way to describe a local variable that actually holds
the address of an lvalue is VT_LLOCAL.  Remove the last user of VT_REF,
and handling of it, thereby freeing a flag for SValue.r.
This commit is contained in:
Michael Matz 2017-02-19 23:50:13 +01:00
parent 8b9697ca6b
commit a8b83ce43a
3 changed files with 3 additions and 12 deletions
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1
tcc.h
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@ -825,7 +825,6 @@ struct filespec {
#define VT_CMP 0x0033 /* the value is stored in processor flags (in vc) */
#define VT_JMP 0x0034 /* value is the consequence of jmp true (even) */
#define VT_JMPI 0x0035 /* value is the consequence of jmp false (odd) */
#define VT_REF 0x0040 /* value is pointer to structure rather than address */
#define VT_LVAL 0x0100 /* var is an lvalue */
#define VT_SYM 0x0200 /* a symbol value is added */
#define VT_MUSTCAST 0x0400 /* value must be casted to be correct (used for

12
tccgen.c
View File

@ -1026,8 +1026,6 @@ static void move_reg(int r, int s, int t)
/* get address of vtop (vtop MUST BE an lvalue) */
ST_FUNC void gaddrof(void)
{
if (vtop->r & VT_REF)
gv(RC_INT);
vtop->r &= ~VT_LVAL;
/* tricky: if saved lvalue, then we can go back to lvalue */
if ((vtop->r & VT_VALMASK) == VT_LLOCAL)
@ -1237,13 +1235,7 @@ ST_FUNC int gv(int rc)
t = vtop->type.t;
t1 = t;
/* compute memory access type */
if (vtop->r & VT_REF)
#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
t = VT_PTR;
#else
t = VT_INT;
#endif
else if (vtop->r & VT_LVAL_BYTE)
if (vtop->r & VT_LVAL_BYTE)
t = VT_BYTE;
else if (vtop->r & VT_LVAL_SHORT)
t = VT_SHORT;
@ -4616,7 +4608,7 @@ ST_FUNC void unary(void)
skip(')');
if ((vtop->r & VT_VALMASK) != VT_LOCAL)
tcc_error("__builtin_va_start expects a local variable");
vtop->r &= ~(VT_LVAL | VT_REF);
vtop->r &= ~VT_LVAL;
vtop->type = char_pointer_type;
vtop->c.i += 8;
vstore();

2
x86_64-gen.c
View File

@ -957,7 +957,7 @@ void gfunc_prolog(CType *func_type)
if (reg_param_index < REGN) {
gen_modrm64(0x89, arg_regs[reg_param_index], VT_LOCAL, NULL, addr);
}
sym_push(sym->v & ~SYM_FIELD, type, VT_LOCAL | VT_LVAL | VT_REF, addr);
sym_push(sym->v & ~SYM_FIELD, type, VT_LLOCAL | VT_LVAL, addr);
} else {
if (reg_param_index < REGN) {
/* save arguments passed by register */