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// Copyright 2015 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.
#ifndef V8_COMPILER_FRAME_STATES_H_
#define V8_COMPILER_FRAME_STATES_H_
#include "src/builtins/builtins.h"
#include "src/compiler/node.h"
#include "src/handles/handles.h"
#include "src/objects/shared-function-info.h"
#include "src/utils/utils.h"
namespace v8 {
namespace internal {
namespace wasm {
class ValueType;
using FunctionSig = Signature<ValueType>;
} // namespace wasm
namespace compiler {
class JSGraph;
class Node;
class SharedFunctionInfoRef;
// Flag that describes how to combine the current environment with
// the output of a node to obtain a framestate for lazy bailout.
class OutputFrameStateCombine {
public:
static const size_t kInvalidIndex = SIZE_MAX;
static OutputFrameStateCombine Ignore() {
return OutputFrameStateCombine(kInvalidIndex);
}
static OutputFrameStateCombine PokeAt(size_t index) {
return OutputFrameStateCombine(index);
}
size_t GetOffsetToPokeAt() const {
DCHECK_NE(parameter_, kInvalidIndex);
return parameter_;
}
bool IsOutputIgnored() const { return parameter_ == kInvalidIndex; }
size_t ConsumedOutputCount() const { return IsOutputIgnored() ? 0 : 1; }
bool operator==(OutputFrameStateCombine const& other) const {
return parameter_ == other.parameter_;
}
bool operator!=(OutputFrameStateCombine const& other) const {
return !(*this == other);
}
friend size_t hash_value(OutputFrameStateCombine const&);
friend std::ostream& operator<<(std::ostream&,
OutputFrameStateCombine const&);
private:
explicit OutputFrameStateCombine(size_t parameter) : parameter_(parameter) {}
size_t const parameter_;
};
// The type of stack frame that a FrameState node represents.
enum class FrameStateType {
kUnoptimizedFunction, // Represents an UnoptimizedFrame.
kArgumentsAdaptor, // Represents an ArgumentsAdaptorFrame.
kConstructStub, // Represents a ConstructStubFrame.
kBuiltinContinuation, // Represents a continuation to a stub.
#if V8_ENABLE_WEBASSEMBLY // ↓ WebAssembly only
kJSToWasmBuiltinContinuation, // Represents a lazy deopt continuation for a
// JS to Wasm call.
#endif // ↑ WebAssembly only
kJavaScriptBuiltinContinuation, // Represents a continuation to a JavaScipt
// builtin.
kJavaScriptBuiltinContinuationWithCatch // Represents a continuation to a
// JavaScipt builtin with a catch
// handler.
};
class FrameStateFunctionInfo {
public:
FrameStateFunctionInfo(FrameStateType type, int parameter_count,
int local_count,
Handle<SharedFunctionInfo> shared_info)
: type_(type),
parameter_count_(parameter_count),
local_count_(local_count),
shared_info_(shared_info) {}
int local_count() const { return local_count_; }
int parameter_count() const { return parameter_count_; }
Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
FrameStateType type() const { return type_; }
static bool IsJSFunctionType(FrameStateType type) {
return type == FrameStateType::kUnoptimizedFunction ||
type == FrameStateType::kJavaScriptBuiltinContinuation ||
type == FrameStateType::kJavaScriptBuiltinContinuationWithCatch;
}
private:
FrameStateType const type_;
int const parameter_count_;
int const local_count_;
Handle<SharedFunctionInfo> const shared_info_;
};
#if V8_ENABLE_WEBASSEMBLY
class JSToWasmFrameStateFunctionInfo : public FrameStateFunctionInfo {
public:
JSToWasmFrameStateFunctionInfo(FrameStateType type, int parameter_count,
int local_count,
Handle<SharedFunctionInfo> shared_info,
const wasm::FunctionSig* signature)
: FrameStateFunctionInfo(type, parameter_count, local_count, shared_info),
signature_(signature) {
DCHECK_NOT_NULL(signature);
}
const wasm::FunctionSig* signature() const { return signature_; }
private:
const wasm::FunctionSig* const signature_;
};
#endif // V8_ENABLE_WEBASSEMBLY
class FrameStateInfo final {
public:
FrameStateInfo(BytecodeOffset bailout_id,
OutputFrameStateCombine state_combine,
const FrameStateFunctionInfo* info)
: bailout_id_(bailout_id),
frame_state_combine_(state_combine),
info_(info) {}
FrameStateType type() const {
return info_ == nullptr ? FrameStateType::kUnoptimizedFunction
: info_->type();
}
BytecodeOffset bailout_id() const { return bailout_id_; }
OutputFrameStateCombine state_combine() const { return frame_state_combine_; }
MaybeHandle<SharedFunctionInfo> shared_info() const {
return info_ == nullptr ? MaybeHandle<SharedFunctionInfo>()
: info_->shared_info();
}
int parameter_count() const {
return info_ == nullptr ? 0 : info_->parameter_count();
}
int local_count() const {
return info_ == nullptr ? 0 : info_->local_count();
}
const FrameStateFunctionInfo* function_info() const { return info_; }
private:
BytecodeOffset const bailout_id_;
OutputFrameStateCombine const frame_state_combine_;
const FrameStateFunctionInfo* const info_;
};
bool operator==(FrameStateInfo const&, FrameStateInfo const&);
bool operator!=(FrameStateInfo const&, FrameStateInfo const&);
size_t hash_value(FrameStateInfo const&);
std::ostream& operator<<(std::ostream&, FrameStateInfo const&);
enum class ContinuationFrameStateMode { EAGER, LAZY, LAZY_WITH_CATCH };
class FrameState;
FrameState CreateStubBuiltinContinuationFrameState(
JSGraph* graph, Builtin name, Node* context, Node* const* parameters,
int parameter_count, Node* outer_frame_state,
ContinuationFrameStateMode mode,
const wasm::FunctionSig* signature = nullptr);
#if V8_ENABLE_WEBASSEMBLY
FrameState CreateJSWasmCallBuiltinContinuationFrameState(
JSGraph* jsgraph, Node* context, Node* outer_frame_state,
const wasm::FunctionSig* signature);
#endif // V8_ENABLE_WEBASSEMBLY
FrameState CreateJavaScriptBuiltinContinuationFrameState(
JSGraph* graph, const SharedFunctionInfoRef& shared, Builtin name,
Node* target, Node* context, Node* const* stack_parameters,
int stack_parameter_count, Node* outer_frame_state,
ContinuationFrameStateMode mode);
FrameState CreateGenericLazyDeoptContinuationFrameState(
JSGraph* graph, const SharedFunctionInfoRef& shared, Node* target,
Node* context, Node* receiver, Node* outer_frame_state);
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_FRAME_STATES_H_
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