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// Copyright 2019 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_GLOBALS_H_
#define V8_COMPILER_GLOBALS_H_
#include "src/common/globals.h"
#include "src/flags/flags.h"
#include "src/objects/js-objects.h"
#include "src/runtime/runtime.h"
namespace v8 {
namespace internal {
namespace compiler {
// The nci flag is currently used to experiment with feedback collection in
// optimized code produced by generic lowering.
// Considerations:
// - Should we increment the call count? https://crbug.com/v8/10524
// - Is feedback already megamorphic in all these cases?
//
// TODO(jgruber): Remove once we've made a decision whether to collect feedback
// unconditionally.
inline bool CollectFeedbackInGenericLowering() {
return v8_flags.turbo_collect_feedback_in_generic_lowering;
}
enum class StackCheckKind : uint8_t {
kJSFunctionEntry = 0,
kJSIterationBody,
kCodeStubAssembler,
kWasm,
};
inline Runtime::FunctionId GetBuiltinForStackCheckKind(StackCheckKind kind) {
if (kind == StackCheckKind::kJSFunctionEntry) {
return Runtime::kStackGuardWithGap;
} else if (kind == StackCheckKind::kJSIterationBody) {
return Runtime::kHandleNoHeapWritesInterrupts;
} else {
return Runtime::kStackGuard;
}
}
enum class CanThrow : uint8_t { kNo, kYes };
inline std::ostream& operator<<(std::ostream& os, StackCheckKind kind) {
switch (kind) {
case StackCheckKind::kJSFunctionEntry:
return os << "JSFunctionEntry";
case StackCheckKind::kJSIterationBody:
return os << "JSIterationBody";
case StackCheckKind::kCodeStubAssembler:
return os << "CodeStubAssembler";
case StackCheckKind::kWasm:
return os << "Wasm";
}
UNREACHABLE();
}
inline size_t hash_value(StackCheckKind kind) {
return static_cast<size_t>(kind);
}
enum class CheckForMinusZeroMode : uint8_t {
kCheckForMinusZero,
kDontCheckForMinusZero,
};
inline size_t hash_value(CheckForMinusZeroMode mode) {
return static_cast<size_t>(mode);
}
inline std::ostream& operator<<(std::ostream& os, CheckForMinusZeroMode mode) {
switch (mode) {
case CheckForMinusZeroMode::kCheckForMinusZero:
return os << "check-for-minus-zero";
case CheckForMinusZeroMode::kDontCheckForMinusZero:
return os << "dont-check-for-minus-zero";
}
UNREACHABLE();
}
// The CallFeedbackRelation provides the meaning of the call feedback for a
// TurboFan JSCall operator
// - kReceiver: The call target was Function.prototype.apply and its receiver
// was recorded as the feedback value.
// - kTarget: The call target was recorded as the feedback value.
// - kUnrelated: The feedback is no longer related to the call. If, during
// lowering, a JSCall (e.g. of a higher order function) is replaced by a
// JSCall with another target, the feedback has to be kept but is now
// unrelated.
enum class CallFeedbackRelation { kReceiver, kTarget, kUnrelated };
inline std::ostream& operator<<(std::ostream& os,
CallFeedbackRelation call_feedback_relation) {
switch (call_feedback_relation) {
case CallFeedbackRelation::kReceiver:
return os << "CallFeedbackRelation::kReceiver";
case CallFeedbackRelation::kTarget:
return os << "CallFeedbackRelation::kTarget";
case CallFeedbackRelation::kUnrelated:
return os << "CallFeedbackRelation::kUnrelated";
}
UNREACHABLE();
}
// Maximum depth and total number of elements and properties for literal
// graphs to be considered for fast deep-copying. The limit is chosen to
// match the maximum number of inobject properties, to ensure that the
// performance of using object literals is not worse than using constructor
// functions, see crbug.com/v8/6211 for details.
const int kMaxFastLiteralDepth = 3;
const int kMaxFastLiteralProperties = JSObject::kMaxInObjectProperties;
enum BaseTaggedness : uint8_t { kUntaggedBase, kTaggedBase };
enum class MemoryAccessKind : uint8_t {
kNormal,
kUnaligned,
kProtected,
};
size_t hash_value(MemoryAccessKind);
V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, MemoryAccessKind);
} // namespace compiler
} // namespace internal
} // namespace v8
// The biggest double value that fits within the int64_t/uint64_t value range.
// This is different from safe integer range in that there are gaps of integers
// in-between that cannot be represented as a double.
constexpr double kMaxDoubleRepresentableInt64 = 9223372036854774784.0;
constexpr double kMinDoubleRepresentableInt64 =
std::numeric_limits<int64_t>::min();
constexpr double kMaxDoubleRepresentableUint64 = 18446744073709549568.0;
// There is no (currently) available constexpr version of base::bit_cast, so
// we have to make do with constructing the -0.0 bits manually (by setting the
// sign bit to 1 and everything else to 0).
// TODO(leszeks): Revisit when upgrading to C++20.
constexpr int32_t kMinusZeroLoBits = static_cast<int32_t>(0);
constexpr int32_t kMinusZeroHiBits = static_cast<int32_t>(1) << 31;
constexpr int64_t kMinusZeroBits =
(static_cast<uint64_t>(kMinusZeroHiBits) << 32) | kMinusZeroLoBits;
#endif // V8_COMPILER_GLOBALS_H_
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