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Avoid C undefined behavior of division by zero; close #3745

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Yukihiro "Matz" Matsumoto
2017-07-19 09:49:41 +09:00
parent ca2cfc6fe9
commit aa3cb0466e
1 changed files with 16 additions and 2 deletions
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src/vm.c
+16 -2
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@@ -2376,7 +2376,14 @@ RETRY_TRY_BLOCK:
{
mrb_int x = mrb_fixnum(regs[a]);
mrb_int y = mrb_fixnum(regs[a+1]);
SET_FLOAT_VALUE(mrb, regs[a], (mrb_float)x / (mrb_float)y);
double f;
if (y == 0) {
f = INFINITY;
}
else {
f = (mrb_float)x / (mrb_float)y;
}
SET_FLOAT_VALUE(mrb, regs[a], f);
}
break;
case TYPES2(MRB_TT_FIXNUM,MRB_TT_FLOAT):
@@ -2391,7 +2398,14 @@ RETRY_TRY_BLOCK:
{
mrb_float x = mrb_float(regs[a]);
mrb_int y = mrb_fixnum(regs[a+1]);
SET_FLOAT_VALUE(mrb, regs[a], x / y);
double f;
if (y == 0) {
f = INFINITY;
}
else {
f = x / y;
}
SET_FLOAT_VALUE(mrb, regs[a], f);
}
#else
OP_MATH_BODY(/,mrb_float,mrb_fixnum);