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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/builtins/builtins-lazy-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/builtins/builtins.h"
#include "src/common/globals.h"
#include "src/objects/feedback-vector.h"
#include "src/objects/shared-function-info.h"
namespace v8 {
namespace internal {
void LazyBuiltinsAssembler::GenerateTailCallToJSCode(
TNode<Code> code, TNode<JSFunction> function) {
TNode<Int32T> argc =
UncheckedCast<Int32T>(Parameter(Descriptor::kActualArgumentsCount));
TNode<Context> context = CAST(Parameter(Descriptor::kContext));
TNode<Object> new_target = CAST(Parameter(Descriptor::kNewTarget));
TailCallJSCode(code, context, function, new_target, argc);
}
void LazyBuiltinsAssembler::GenerateTailCallToReturnedCode(
Runtime::FunctionId function_id, TNode<JSFunction> function) {
TNode<Context> context = CAST(Parameter(Descriptor::kContext));
TNode<Code> code = CAST(CallRuntime(function_id, context, function));
GenerateTailCallToJSCode(code, function);
}
void LazyBuiltinsAssembler::TailCallRuntimeIfMarkerEquals(
TNode<Smi> marker, OptimizationMarker expected_marker,
Runtime::FunctionId function_id, TNode<JSFunction> function) {
Label no_match(this);
GotoIfNot(SmiEqual(marker, SmiConstant(expected_marker)), &no_match);
GenerateTailCallToReturnedCode(function_id, function);
BIND(&no_match);
}
void LazyBuiltinsAssembler::MaybeTailCallOptimizedCodeSlot(
TNode<JSFunction> function, TNode<FeedbackVector> feedback_vector) {
Label fallthrough(this);
TNode<MaybeObject> maybe_optimized_code_entry = LoadMaybeWeakObjectField(
feedback_vector, FeedbackVector::kOptimizedCodeWeakOrSmiOffset);
// Check if the code entry is a Smi. If yes, we interpret it as an
// optimisation marker. Otherwise, interpret it as a weak reference to a code
// object.
Label optimized_code_slot_is_smi(this), optimized_code_slot_is_weak_ref(this);
Branch(TaggedIsSmi(maybe_optimized_code_entry), &optimized_code_slot_is_smi,
&optimized_code_slot_is_weak_ref);
BIND(&optimized_code_slot_is_smi);
{
// Optimized code slot is a Smi optimization marker.
TNode<Smi> marker = CAST(maybe_optimized_code_entry);
// Fall through if no optimization trigger.
GotoIf(SmiEqual(marker, SmiConstant(OptimizationMarker::kNone)),
&fallthrough);
// TODO(ishell): introduce Runtime::kHandleOptimizationMarker and check
// all these marker values there.
TailCallRuntimeIfMarkerEquals(marker,
OptimizationMarker::kLogFirstExecution,
Runtime::kFunctionFirstExecution, function);
TailCallRuntimeIfMarkerEquals(marker, OptimizationMarker::kCompileOptimized,
Runtime::kCompileOptimized_NotConcurrent,
function);
TailCallRuntimeIfMarkerEquals(
marker, OptimizationMarker::kCompileOptimizedConcurrent,
Runtime::kCompileOptimized_Concurrent, function);
// Otherwise, the marker is InOptimizationQueue, so fall through hoping
// that an interrupt will eventually update the slot with optimized code.
CSA_ASSERT(this,
SmiEqual(marker,
SmiConstant(OptimizationMarker::kInOptimizationQueue)));
Goto(&fallthrough);
}
BIND(&optimized_code_slot_is_weak_ref);
{
// Optimized code slot is a weak reference.
TNode<Code> optimized_code =
CAST(GetHeapObjectAssumeWeak(maybe_optimized_code_entry, &fallthrough));
// Check if the optimized code is marked for deopt. If it is, call the
// runtime to clear it.
Label found_deoptimized_code(this);
TNode<CodeDataContainer> code_data_container =
CAST(LoadObjectField(optimized_code, Code::kCodeDataContainerOffset));
TNode<Int32T> code_kind_specific_flags = LoadObjectField<Int32T>(
code_data_container, CodeDataContainer::kKindSpecificFlagsOffset);
GotoIf(IsSetWord32<Code::MarkedForDeoptimizationField>(
code_kind_specific_flags),
&found_deoptimized_code);
// Optimized code is good, get it into the closure and link the closure into
// the optimized functions list, then tail call the optimized code.
StoreObjectField(function, JSFunction::kCodeOffset, optimized_code);
GenerateTailCallToJSCode(optimized_code, function);
// Optimized code slot contains deoptimized code, evict it and re-enter the
// closure's code.
BIND(&found_deoptimized_code);
GenerateTailCallToReturnedCode(Runtime::kEvictOptimizedCodeSlot, function);
}
// Fall-through if the optimized code cell is clear and there is no
// optimization marker.
BIND(&fallthrough);
}
void LazyBuiltinsAssembler::CompileLazy(TNode<JSFunction> function) {
// First lookup code, maybe we don't need to compile!
Label compile_function(this, Label::kDeferred);
// Check the code object for the SFI. If SFI's code entry points to
// CompileLazy, then we need to lazy compile regardless of the function or
// feedback vector marker.
TNode<SharedFunctionInfo> shared =
CAST(LoadObjectField(function, JSFunction::kSharedFunctionInfoOffset));
TNode<Code> sfi_code = GetSharedFunctionInfoCode(shared, &compile_function);
TNode<HeapObject> feedback_cell_value = LoadFeedbackCellValue(function);
// If feedback cell isn't initialized, compile function
GotoIf(IsUndefined(feedback_cell_value), &compile_function);
Label use_sfi_code(this);
// If there is no feedback, don't check for optimized code.
GotoIf(HasInstanceType(feedback_cell_value, CLOSURE_FEEDBACK_CELL_ARRAY_TYPE),
&use_sfi_code);
// If it isn't undefined or fixed array it must be a feedback vector.
CSA_ASSERT(this, IsFeedbackVector(feedback_cell_value));
// Is there an optimization marker or optimized code in the feedback vector?
MaybeTailCallOptimizedCodeSlot(function, CAST(feedback_cell_value));
Goto(&use_sfi_code);
BIND(&use_sfi_code);
// If not, install the SFI's code entry and jump to that.
CSA_ASSERT(this, TaggedNotEqual(sfi_code, HeapConstant(BUILTIN_CODE(
isolate(), CompileLazy))));
StoreObjectField(function, JSFunction::kCodeOffset, sfi_code);
GenerateTailCallToJSCode(sfi_code, function);
BIND(&compile_function);
GenerateTailCallToReturnedCode(Runtime::kCompileLazy, function);
}
TF_BUILTIN(CompileLazy, LazyBuiltinsAssembler) {
TNode<JSFunction> function = CAST(Parameter(Descriptor::kTarget));
CompileLazy(function);
}
TF_BUILTIN(CompileLazyDeoptimizedCode, LazyBuiltinsAssembler) {
TNode<JSFunction> function = CAST(Parameter(Descriptor::kTarget));
// Set the code slot inside the JSFunction to CompileLazy.
TNode<Code> code = HeapConstant(BUILTIN_CODE(isolate(), CompileLazy));
StoreObjectField(function, JSFunction::kCodeOffset, code);
GenerateTailCallToJSCode(code, function);
}
} // namespace internal
} // namespace v8
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