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Unified Diff: src/arm/full-codegen-arm.cc

Issue 297203002: Skip write barriers in the fast case when setting up local context. (Closed) Base URL: git@github.com:v8/v8.git@master
Patch Set: Created 6 years, 7 months ago
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Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index cb7d7da89f854c9eeb88a327a19cc715e482917e..ccde8b6b227901c07fd5be6e9beb1d5537400963 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -212,6 +212,7 @@ void FullCodeGenerator::Generate() {
if (heap_slots > 0) {
// Argument to NewContext is the function, which is still in r1.
Comment cmnt(masm_, "[ Allocate context");
+ bool need_write_barrier = true;
if (FLAG_harmony_scoping && info->scope()->is_global_scope()) {
__ push(r1);
__ Push(info->scope()->GetScopeInfo());
@@ -219,6 +220,8 @@ void FullCodeGenerator::Generate() {
} else if (heap_slots <= FastNewContextStub::kMaximumSlots) {
FastNewContextStub stub(isolate(), heap_slots);
__ CallStub(&stub);
+ // Result of FastNewContextStub is always in new space.
+ need_write_barrier = false;
} else {
__ push(r1);
__ CallRuntime(Runtime::kHiddenNewFunctionContext, 1);
@@ -242,8 +245,15 @@ void FullCodeGenerator::Generate() {
__ str(r0, target);
// Update the write barrier.
- __ RecordWriteContextSlot(
- cp, target.offset(), r0, r3, kLRHasBeenSaved, kDontSaveFPRegs);
+ if (need_write_barrier) {
+ __ RecordWriteContextSlot(
+ cp, target.offset(), r0, r3, kLRHasBeenSaved, kDontSaveFPRegs);
+ } else if (FLAG_debug_code) {
+ Label done;
+ __ JumpIfInNewSpace(cp, r0, &done);
+ __ Abort(kExpectedNewSpaceObject);
+ __ bind(&done);
+ }
}
}
}
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