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Unified Diff: src/x64/code-stubs-x64.cc

Issue 886663004: Revert of Use a WeakCell in the CallIC type vector. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years, 11 months ago
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Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index a1bef5176d49f07534e3294ca9a459eb09ac0ac0..ae2d92158dd75cfc89366a37afd9f57c750725aa 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -2115,29 +2115,9 @@
// The checks. First, does rdi match the recorded monomorphic target?
__ SmiToInteger32(rdx, rdx);
- __ movp(rcx,
- FieldOperand(rbx, rdx, times_pointer_size, FixedArray::kHeaderSize));
-
- // We don't know that we have a weak cell. We might have a private symbol
- // or an AllocationSite, but the memory is safe to examine.
- // AllocationSite::kTransitionInfoOffset - contains a Smi or pointer to
- // FixedArray.
- // WeakCell::kValueOffset - contains a JSFunction or Smi(0)
- // Symbol::kHashFieldSlot - if the low bit is 1, then the hash is not
- // computed, meaning that it can't appear to be a pointer. If the low bit is
- // 0, then hash is computed, but the 0 bit prevents the field from appearing
- // to be a pointer.
- STATIC_ASSERT(WeakCell::kSize >= kPointerSize);
- STATIC_ASSERT(AllocationSite::kTransitionInfoOffset ==
- WeakCell::kValueOffset &&
- WeakCell::kValueOffset == Symbol::kHashFieldSlot);
-
- __ cmpp(rdi, FieldOperand(rcx, WeakCell::kValueOffset));
+ __ cmpp(rdi, FieldOperand(rbx, rdx, times_pointer_size,
+ FixedArray::kHeaderSize));
__ j(not_equal, &extra_checks_or_miss);
-
- // The compare above could have been a SMI/SMI comparison. Guard against this
- // convincing us that we have a monomorphic JSFunction.
- __ JumpIfSmi(rdi, &extra_checks_or_miss);
__ bind(&have_js_function);
if (CallAsMethod()) {
@@ -2167,6 +2147,8 @@
__ bind(&extra_checks_or_miss);
Label uninitialized, miss;
+ __ movp(rcx, FieldOperand(rbx, rdx, times_pointer_size,
+ FixedArray::kHeaderSize));
__ Cmp(rcx, TypeFeedbackVector::MegamorphicSentinel(isolate));
__ j(equal, &slow_start);
@@ -2209,20 +2191,14 @@
// Update stats.
__ SmiAddConstant(FieldOperand(rbx, with_types_offset), Smi::FromInt(1));
- // Store the function. Use a stub since we need a frame for allocation.
- // rbx - vector
- // rdx - slot (needs to be in smi form)
- // rdi - function
- {
- FrameScope scope(masm, StackFrame::INTERNAL);
- CreateWeakCellStub create_stub(isolate);
-
- __ Integer32ToSmi(rdx, rdx);
- __ Push(rdi);
- __ CallStub(&create_stub);
- __ Pop(rdi);
- }
-
+ // Store the function.
+ __ movp(FieldOperand(rbx, rdx, times_pointer_size, FixedArray::kHeaderSize),
+ rdi);
+
+ // Update the write barrier.
+ __ movp(rax, rdi);
+ __ RecordWriteArray(rbx, rax, rdx, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
+ OMIT_SMI_CHECK);
__ jmp(&have_js_function);
// We are here because tracing is on or we encountered a MISS case we can't
@@ -2284,7 +2260,6 @@
// It is important that the store buffer overflow stubs are generated first.
ArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
- CreateWeakCellStub::GenerateAheadOfTime(isolate);
BinaryOpICStub::GenerateAheadOfTime(isolate);
BinaryOpICWithAllocationSiteStub::GenerateAheadOfTime(isolate);
}
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