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add guards for root cycles

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John Alanbrook
2026-02-18 18:27:12 -06:00
parent 94fe47b472
commit dc70a15981
2 changed files with 9 additions and 2 deletions
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4
source/runtime.c
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@@ -150,6 +150,7 @@ int JS_IsPretext (JSValue v) {
}
JSValue *JS_PushGCRef (JSContext *ctx, JSGCRef *ref) {
assert(ref != ctx->top_gc_ref && "JS_ROOT used in a loop — same address pushed twice");
ref->prev = ctx->top_gc_ref;
ctx->top_gc_ref = ref;
ref->val = JS_NULL;
@@ -157,11 +158,13 @@ JSValue *JS_PushGCRef (JSContext *ctx, JSGCRef *ref) {
}
JSValue JS_PopGCRef (JSContext *ctx, JSGCRef *ref) {
assert(ctx->top_gc_ref == ref && "JS_PopGCRef: not popping top of stack — mismatched push/pop");
ctx->top_gc_ref = ref->prev;
return ref->val;
}
JSValue *JS_AddGCRef (JSContext *ctx, JSGCRef *ref) {
assert(ref != ctx->last_gc_ref && "JS_AddGCRef: same address added twice — cycle in GC ref list");
ref->prev = ctx->last_gc_ref;
ctx->last_gc_ref = ref;
ref->val = JS_NULL;
@@ -193,6 +196,7 @@ JSLocalRef *JS_GetLocalFrame (JSContext *ctx) {
}
void JS_PushLocalRef (JSContext *ctx, JSLocalRef *ref) {
assert(ref != ctx->top_local_ref && "JS_LOCAL used in a loop — same address pushed twice");
ref->prev = ctx->top_local_ref;
ctx->top_local_ref = ref;
}