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Fix AL/AX is not extended to EAX when calling indirectly

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AL/AX should be extended to EAX when calling functions. However, the previous code did this only for direct calls, indirect calls were ignored.
New code also avoid redundant code when generating JMP instruction. (i.e. expanding code should be generated with CALL instruction only)
This commit is contained in:
Zhang Boyang 2017-09-09 21:01:42 +08:00
parent a82c11f4b4
commit 02370acdc9
1 changed files with 8 additions and 6 deletions
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14
i386-gen.c
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@ -346,7 +346,6 @@ static void gcall_or_jmp(int is_jmp)
{
int r;
if ((vtop->r & (VT_VALMASK | VT_LVAL)) == VT_CONST) {
int rt;
/* constant case */
if (vtop->r & VT_SYM) {
/* relocation case */
@ -358,6 +357,14 @@ static void gcall_or_jmp(int is_jmp)
ind + 1, R_386_PC32, 0);
}
oad(0xe8 + is_jmp, vtop->c.i - 4); /* call/jmp im */
} else {
/* otherwise, indirect call */
r = gv(RC_INT);
o(0xff); /* call/jmp *r */
o(0xd0 + r + (is_jmp << 4));
}
if (!is_jmp) {
int rt;
/* extend the return value to the whole register if necessary
visual studio and gcc do not always set the whole eax register
when assigning the return value of a function */
@ -382,11 +389,6 @@ static void gcall_or_jmp(int is_jmp)
default:
break;
}
} else {
/* otherwise, indirect call */
r = gv(RC_INT);
o(0xff); /* call/jmp *r */
o(0xd0 + r + (is_jmp << 4));
}
}