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codegen.c: removed bytecode when the value of while is not used.

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2021-07-23 15:51:01 +09:00
parent 2910af0010
commit e81d497155
1 changed files with 8 additions and 6 deletions
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mrbgems/mruby-compiler/core/codegen.c
+8 -6
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@@ -39,7 +39,7 @@ enum looptype {
struct loopinfo {
enum looptype type;
uint32_t pc0, pc1, pc2, pc3;
uint32_t pc0, pc2, pc3;
int acc;
struct loopinfo *prev;
};
@@ -1931,13 +1931,14 @@ codegen(codegen_scope *s, node *tree, int val)
case NODE_WHILE:
{
struct loopinfo *lp = loop_push(s, LOOP_NORMAL);
uint32_t pc1;
if (!val) lp->acc = -1;
lp->pc0 = new_label(s);
lp->pc1 = genjmp_0(s, OP_JMP);
pc1 = genjmp_0(s, OP_JMP);
lp->pc2 = new_label(s);
codegen(s, tree->cdr, NOVAL);
dispatch(s, lp->pc1);
dispatch(s, pc1);
codegen(s, tree->car, VAL);
pop();
genjmp2(s, OP_JMPIF, cursp(), lp->pc2, NOVAL);
@@ -1949,13 +1950,14 @@ codegen(codegen_scope *s, node *tree, int val)
case NODE_UNTIL:
{
struct loopinfo *lp = loop_push(s, LOOP_NORMAL);
uint32_t pc1;
if (!val) lp->acc = -1;
lp->pc0 = new_label(s);
lp->pc1 = genjmp_0(s, OP_JMP);
pc1 = genjmp_0(s, OP_JMP);
lp->pc2 = new_label(s);
codegen(s, tree->cdr, NOVAL);
dispatch(s, lp->pc1);
dispatch(s, pc1);
codegen(s, tree->car, VAL);
pop();
genjmp2(s, OP_JMPNOT, cursp(), lp->pc2, NOVAL);
@@ -3322,7 +3324,7 @@ loop_push(codegen_scope *s, enum looptype t)
struct loopinfo *p = (struct loopinfo *)codegen_palloc(s, sizeof(struct loopinfo));
p->type = t;
p->pc0 = p->pc1 = p->pc2 = p->pc3 = JMPLINK_START;
p->pc0 = p->pc2 = p->pc3 = JMPLINK_START;
p->prev = s->loop;
p->acc = cursp();
s->loop = p;