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a bounds checking code for the ARCH=x86_64

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This commit is contained in:
seyko
2015-04-10 15:17:22 +03:00
parent e92dc595cd
commit 559675b90a
8 changed files with 319 additions and 64 deletions
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19
tccgen.c
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@ -708,7 +708,7 @@ static void gbound(void)
lval_type = vtop->r & (VT_LVAL_TYPE | VT_LVAL);
/* must save type because we must set it to int to get pointer */
type1 = vtop->type;
vtop->type.t = VT_INT;
vtop->type.t = VT_PTR;
gaddrof();
vpushi(0);
gen_bounded_ptr_add();
@ -1752,7 +1752,22 @@ ST_FUNC void gen_op(int op)
#endif
}
gen_op('*');
#ifdef CONFIG_TCC_BCHECK
#if 0
/* #ifdef CONFIG_TCC_BCHECK
The main reason to removing this code:
#include <stdio.h>
int main ()
{
int v[10];
int i = 10;
int j = 9;
fprintf(stderr, "v+i-j = %p\n", v+i-j);
fprintf(stderr, "v+(i-j) = %p\n", v+(i-j));
}
When this code is on. then the output looks like
v+i-j = 0xfffffffe
v+(i-j) = 0xbff84000
*/
/* if evaluating constant expression, no code should be
generated, so no bound check */
if (tcc_state->do_bounds_check && !const_wanted) {