// Copyright 2012 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_GLOBALS_H_
#define V8_GLOBALS_H_
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include <ostream>
#include "include/v8.h"
#include "src/base/build_config.h"
#include "src/base/flags.h"
#include "src/base/logging.h"
#include "src/base/macros.h"
#define V8_INFINITY std::numeric_limits<double>::infinity()
namespace v8 {
namespace base {
class Mutex;
class RecursiveMutex;
}
namespace internal {
// Determine whether we are running in a simulated environment.
// Setting USE_SIMULATOR explicitly from the build script will force
// the use of a simulated environment.
#if !defined(USE_SIMULATOR)
#if (V8_TARGET_ARCH_ARM64 && !V8_HOST_ARCH_ARM64)
#define USE_SIMULATOR 1
#endif
#if (V8_TARGET_ARCH_ARM && !V8_HOST_ARCH_ARM)
#define USE_SIMULATOR 1
#endif
#if (V8_TARGET_ARCH_PPC && !V8_HOST_ARCH_PPC)
#define USE_SIMULATOR 1
#endif
#if (V8_TARGET_ARCH_MIPS && !V8_HOST_ARCH_MIPS)
#define USE_SIMULATOR 1
#endif
#if (V8_TARGET_ARCH_MIPS64 && !V8_HOST_ARCH_MIPS64)
#define USE_SIMULATOR 1
#endif
#if (V8_TARGET_ARCH_S390 && !V8_HOST_ARCH_S390)
#define USE_SIMULATOR 1
#endif
#endif
// Determine whether the architecture uses an embedded constant pool
// (contiguous constant pool embedded in code object).
#if V8_TARGET_ARCH_PPC
#define V8_EMBEDDED_CONSTANT_POOL 1
#else
#define V8_EMBEDDED_CONSTANT_POOL 0
#endif
#ifdef V8_TARGET_ARCH_ARM
// Set stack limit lower for ARM than for other architectures because
// stack allocating MacroAssembler takes 120K bytes.
// See issue crbug.com/405338
#define V8_DEFAULT_STACK_SIZE_KB 864
#else
// Slightly less than 1MB, since Windows' default stack size for
// the main execution thread is 1MB for both 32 and 64-bit.
#define V8_DEFAULT_STACK_SIZE_KB 984
#endif
// Minimum stack size in KB required by compilers.
constexpr int kStackSpaceRequiredForCompilation = 40;
// Determine whether double field unboxing feature is enabled.
#if V8_TARGET_ARCH_64_BIT
#define V8_DOUBLE_FIELDS_UNBOXING 1
#else
#define V8_DOUBLE_FIELDS_UNBOXING 0
#endif
// Some types of tracing require the SFI to store a unique ID.
#if defined(V8_TRACE_MAPS) || defined(V8_TRACE_IGNITION)
#define V8_SFI_HAS_UNIQUE_ID 1
#endif
// Superclass for classes only using static method functions.
// The subclass of AllStatic cannot be instantiated at all.
class AllStatic {
#ifdef DEBUG
public:
AllStatic() = delete;
#endif
};
// DEPRECATED
// TODO(leszeks): Delete this during a quiet period
#define BASE_EMBEDDED
typedef uint8_t byte;
typedef uintptr_t Address;
static const Address kNullAddress = 0;
// -----------------------------------------------------------------------------
// Constants
constexpr int KB = 1024;
constexpr int MB = KB * KB;
constexpr int GB = KB * KB * KB;
constexpr int kMaxInt = 0x7FFFFFFF;
constexpr int kMinInt = -kMaxInt - 1;
constexpr int kMaxInt8 = (1 << 7) - 1;
constexpr int kMinInt8 = -(1 << 7);
constexpr int kMaxUInt8 = (1 << 8) - 1;
constexpr int kMinUInt8 = 0;
constexpr int kMaxInt16 = (1 << 15) - 1;
constexpr int kMinInt16 = -(1 << 15);
constexpr int kMaxUInt16 = (1 << 16) - 1;
constexpr int kMinUInt16 = 0;
constexpr uint32_t kMaxUInt32 = 0xFFFFFFFFu;
constexpr int kMinUInt32 = 0;
constexpr int kUInt8Size = sizeof(uint8_t);
constexpr int kCharSize = sizeof(char);
constexpr int kShortSize = sizeof(short); // NOLINT
constexpr int kUInt16Size = sizeof(uint16_t);
constexpr int kIntSize = sizeof(int);
constexpr int kInt32Size = sizeof(int32_t);
constexpr int kInt64Size = sizeof(int64_t);
constexpr int kUInt32Size = sizeof(uint32_t);
constexpr int kSizetSize = sizeof(size_t);
constexpr int kFloatSize = sizeof(float);
constexpr int kDoubleSize = sizeof(double);
constexpr int kIntptrSize = sizeof(intptr_t);
constexpr int kUIntptrSize = sizeof(uintptr_t);
constexpr int kPointerSize = sizeof(void*);
constexpr int kPointerHexDigits = kPointerSize == 4 ? 8 : 12;
#if V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT
constexpr int kRegisterSize = kPointerSize + kPointerSize;
#else
constexpr int kRegisterSize = kPointerSize;
#endif
constexpr int kPCOnStackSize = kRegisterSize;
constexpr int kFPOnStackSize = kRegisterSize;
#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32
constexpr int kElidedFrameSlots = kPCOnStackSize / kPointerSize;
#else
constexpr int kElidedFrameSlots = 0;
#endif
constexpr int kDoubleSizeLog2 = 3;
#if V8_TARGET_ARCH_ARM64
// ARM64 only supports direct calls within a 128 MB range.
constexpr size_t kMaxWasmCodeMemory = 128 * MB;
#else
constexpr size_t kMaxWasmCodeMemory = 1024 * MB;
#endif
#if V8_HOST_ARCH_64_BIT
constexpr int kPointerSizeLog2 = 3;
constexpr intptr_t kIntptrSignBit =
static_cast<intptr_t>(uintptr_t{0x8000000000000000});
constexpr uintptr_t kUintptrAllBitsSet = uintptr_t{0xFFFFFFFFFFFFFFFF};
constexpr bool kRequiresCodeRange = true;
#if V8_TARGET_ARCH_MIPS64
// To use pseudo-relative jumps such as j/jal instructions which have 28-bit
// encoded immediate, the addresses have to be in range of 256MB aligned
// region. Used only for large object space.
constexpr size_t kMaximalCodeRangeSize = 256 * MB;
constexpr size_t kCodeRangeAreaAlignment = 256 * MB;
#elif V8_HOST_ARCH_PPC && V8_TARGET_ARCH_PPC && V8_OS_LINUX
constexpr size_t kMaximalCodeRangeSize = 512 * MB;
constexpr size_t kCodeRangeAreaAlignment = 64 * KB; // OS page on PPC Linux
#elif V8_TARGET_ARCH_ARM64
constexpr size_t kMaximalCodeRangeSize = 128 * MB;
constexpr size_t kCodeRangeAreaAlignment = 4 * KB; // OS page.
#else
constexpr size_t kMaximalCodeRangeSize = 128 * MB;
constexpr size_t kCodeRangeAreaAlignment = 4 * KB; // OS page.
#endif
#if V8_OS_WIN
constexpr size_t kMinimumCodeRangeSize = 4 * MB;
constexpr size_t kReservedCodeRangePages = 1;
#else
constexpr size_t kMinimumCodeRangeSize = 3 * MB;
constexpr size_t kReservedCodeRangePages = 0;
#endif
#else
constexpr int kPointerSizeLog2 = 2;
constexpr intptr_t kIntptrSignBit = 0x80000000;
constexpr uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;
#if V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT
// x32 port also requires code range.
constexpr bool kRequiresCodeRange = true;
constexpr size_t kMaximalCodeRangeSize = 256 * MB;
constexpr size_t kMinimumCodeRangeSize = 3 * MB;
constexpr size_t kCodeRangeAreaAlignment = 4 * KB; // OS page.
#elif V8_HOST_ARCH_PPC && V8_TARGET_ARCH_PPC && V8_OS_LINUX
constexpr bool kRequiresCodeRange = false;
constexpr size_t kMaximalCodeRangeSize = 0 * MB;
constexpr size_t kMinimumCodeRangeSize = 0 * MB;
constexpr size_t kCodeRangeAreaAlignment = 64 * KB; // OS page on PPC Linux
#else
constexpr bool kRequiresCodeRange = false;
constexpr size_t kMaximalCodeRangeSize = 0 * MB;
constexpr size_t kMinimumCodeRangeSize = 0 * MB;
constexpr size_t kCodeRangeAreaAlignment = 4 * KB; // OS page.
#endif
constexpr size_t kReservedCodeRangePages = 0;
#endif
// Trigger an incremental GCs once the external memory reaches this limit.
constexpr int kExternalAllocationSoftLimit = 64 * MB;
// Maximum object size that gets allocated into regular pages. Objects larger
// than that size are allocated in large object space and are never moved in
// memory. This also applies to new space allocation, since objects are never
// migrated from new space to large object space. Takes double alignment into
// account.
//
// Current value: Page::kAllocatableMemory (on 32-bit arch) - 512 (slack).
constexpr int kMaxRegularHeapObjectSize = 507136;
// Objects smaller or equal kMaxNewSpaceHeapObjectSize are allocated in the
// new large object space.
constexpr int kMaxNewSpaceHeapObjectSize = 32 * KB;
STATIC_ASSERT(kPointerSize == (1 << kPointerSizeLog2));
constexpr int kBitsPerByte = 8;
constexpr int kBitsPerByteLog2 = 3;
constexpr int kBitsPerPointer = kPointerSize * kBitsPerByte;
constexpr int kBitsPerInt = kIntSize * kBitsPerByte;
// IEEE 754 single precision floating point number bit layout.
constexpr uint32_t kBinary32SignMask = 0x80000000u;
constexpr uint32_t kBinary32ExponentMask = 0x7f800000u;
constexpr uint32_t kBinary32MantissaMask = 0x007fffffu;
constexpr int kBinary32ExponentBias = 127;
constexpr int kBinary32MaxExponent = 0xFE;
constexpr int kBinary32MinExponent = 0x01;
constexpr int kBinary32MantissaBits = 23;
constexpr int kBinary32ExponentShift = 23;
// Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no
// other bits set.
constexpr uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
// Latin1/UTF-16 constants
// Code-point values in Unicode 4.0 are 21 bits wide.
// Code units in UTF-16 are 16 bits wide.
typedef uint16_t uc16;
typedef int32_t uc32;
constexpr int kOneByteSize = kCharSize;
constexpr int kUC16Size = sizeof(uc16); // NOLINT
// 128 bit SIMD value size.
constexpr int kSimd128Size = 16;
// FUNCTION_ADDR(f) gets the address of a C function f.
#define FUNCTION_ADDR(f) (reinterpret_cast<v8::internal::Address>(f))
// FUNCTION_CAST<F>(addr) casts an address into a function
// of type F. Used to invoke generated code from within C.
template <typename F>
F FUNCTION_CAST(byte* addr) {
return reinterpret_cast<F>(reinterpret_cast<Address>(addr));
}
template <typename F>
F FUNCTION_CAST(Address addr) {
return reinterpret_cast<F>(addr);
}
// Determine whether the architecture uses function descriptors
// which provide a level of indirection between the function pointer
// and the function entrypoint.
#if V8_HOST_ARCH_PPC && \
(V8_OS_AIX || (V8_TARGET_ARCH_PPC64 && V8_TARGET_BIG_ENDIAN))
#define USES_FUNCTION_DESCRIPTORS 1
#define FUNCTION_ENTRYPOINT_ADDRESS(f) \
(reinterpret_cast<v8::internal::Address*>( \
&(reinterpret_cast<intptr_t*>(f)[0])))
#else
#define USES_FUNCTION_DESCRIPTORS 0
#endif
// -----------------------------------------------------------------------------
// Declarations for use in both the preparser and the rest of V8.
// The Strict Mode (ECMA-262 5th edition, 4.2.2).
enum class LanguageMode : bool { kSloppy, kStrict };
static const size_t LanguageModeSize = 2;
inline size_t hash_value(LanguageMode mode) {
return static_cast<size_t>(mode);
}
inline std::ostream& operator<<(std::ostream& os, const LanguageMode& mode) {
switch (mode) {
case LanguageMode::kSloppy:
return os << "sloppy";
case LanguageMode::kStrict:
return os << "strict";
}
UNREACHABLE();
}
inline bool is_sloppy(LanguageMode language_mode) {
return language_mode == LanguageMode::kSloppy;
}
inline bool is_strict(LanguageMode language_mode) {
return language_mode != LanguageMode::kSloppy;
}
inline bool is_valid_language_mode(int language_mode) {
return language_mode == static_cast<int>(LanguageMode::kSloppy) ||
language_mode == static_cast<int>(LanguageMode::kStrict);
}
inline LanguageMode construct_language_mode(bool strict_bit) {
return static_cast<LanguageMode>(strict_bit);
}
// Return kStrict if either of the language modes is kStrict, or kSloppy
// otherwise.
inline LanguageMode stricter_language_mode(LanguageMode mode1,
LanguageMode mode2) {
STATIC_ASSERT(LanguageModeSize == 2);
return static_cast<LanguageMode>(static_cast<int>(mode1) |
static_cast<int>(mode2));
}
enum TypeofMode : int { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
// Enums used by CEntry.
enum SaveFPRegsMode { kDontSaveFPRegs, kSaveFPRegs };
enum ArgvMode { kArgvOnStack, kArgvInRegister };
// This constant is used as an undefined value when passing source positions.
constexpr int kNoSourcePosition = -1;
// This constant is used to indicate missing deoptimization information.
constexpr int kNoDeoptimizationId = -1;
// Deoptimize bailout kind:
// - Eager: a check failed in the optimized code and deoptimization happens
// immediately.
// - Lazy: the code has been marked as dependent on some assumption which
// is checked elsewhere and can trigger deoptimization the next time the
// code is executed.
// - Soft: similar to lazy deoptimization, but does not contribute to the
// total deopt count which can lead to disabling optimization for a function.
enum class DeoptimizeKind : uint8_t {
kEager,
kSoft,
kLazy,
kLastDeoptimizeKind = kLazy
};
inline size_t hash_value(DeoptimizeKind kind) {
return static_cast<size_t>(kind);
}
inline std::ostream& operator<<(std::ostream& os, DeoptimizeKind kind) {
switch (kind) {
case DeoptimizeKind::kEager:
return os << "Eager";
case DeoptimizeKind::kSoft:
return os << "Soft";
case DeoptimizeKind::kLazy:
return os << "Lazy";
}
UNREACHABLE();
}
// Indicates whether the lookup is related to sloppy-mode block-scoped
// function hoisting, and is a synthetic assignment for that.
enum class LookupHoistingMode { kNormal, kLegacySloppy };
inline std::ostream& operator<<(std::ostream& os,
const LookupHoistingMode& mode) {
switch (mode) {
case LookupHoistingMode::kNormal:
return os << "normal hoisting";
case LookupHoistingMode::kLegacySloppy:
return os << "legacy sloppy hoisting";
}
UNREACHABLE();
}
static_assert(kSmiValueSize <= 32, "Unsupported Smi tagging scheme");
// Smi sign bit position must be 32-bit aligned so we can use sign extension
// instructions on 64-bit architectures without additional shifts.
static_assert((kSmiValueSize + kSmiShiftSize + kSmiTagSize) % 32 == 0,
"Unsupported Smi tagging scheme");
constexpr bool kIsSmiValueInUpper32Bits =
(kSmiValueSize + kSmiShiftSize + kSmiTagSize) == 64;
constexpr bool kIsSmiValueInLower32Bits =
(kSmiValueSize + kSmiShiftSize + kSmiTagSize) == 32;
static_assert(!SmiValuesAre32Bits() == SmiValuesAre31Bits(),
"Unsupported Smi tagging scheme");
static_assert(SmiValuesAre32Bits() == kIsSmiValueInUpper32Bits,
"Unsupported Smi tagging scheme");
static_assert(SmiValuesAre31Bits() == kIsSmiValueInLower32Bits,
"Unsupported Smi tagging scheme");
// Mask for the sign bit in a smi.
constexpr intptr_t kSmiSignMask = static_cast<intptr_t>(
uintptr_t{1} << (kSmiValueSize + kSmiShiftSize + kSmiTagSize - 1));
constexpr int kObjectAlignmentBits = kPointerSizeLog2;
constexpr intptr_t kObjectAlignment = 1 << kObjectAlignmentBits;
constexpr intptr_t kObjectAlignmentMask = kObjectAlignment - 1;
// Desired alignment for pointers.
constexpr intptr_t kPointerAlignment = (1 << kPointerSizeLog2);
constexpr intptr_t kPointerAlignmentMask = kPointerAlignment - 1;
// Desired alignment for double values.
constexpr intptr_t kDoubleAlignment = 8;
constexpr intptr_t kDoubleAlignmentMask = kDoubleAlignment - 1;
// Desired alignment for generated code is 32 bytes (to improve cache line
// utilization).
constexpr int kCodeAlignmentBits = 5;
constexpr intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
constexpr intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
const intptr_t kWeakHeapObjectMask = 1 << 1;
const intptr_t kClearedWeakHeapObject = 3;
// Zap-value: The value used for zapping dead objects.
// Should be a recognizable hex value tagged as a failure.
#ifdef V8_HOST_ARCH_64_BIT
constexpr uint64_t kClearedFreeMemoryValue = 0;
constexpr uint64_t kZapValue = uint64_t{0xdeadbeedbeadbeef};
constexpr uint64_t kHandleZapValue = uint64_t{0x1baddead0baddeaf};
constexpr uint64_t kGlobalHandleZapValue = uint64_t{0x1baffed00baffedf};
constexpr uint64_t kFromSpaceZapValue = uint64_t{0x1beefdad0beefdaf};
constexpr uint64_t kDebugZapValue = uint64_t{0xbadbaddbbadbaddb};
constexpr uint64_t kSlotsZapValue = uint64_t{0xbeefdeadbeefdeef};
constexpr uint64_t kFreeListZapValue = 0xfeed1eaffeed1eaf;
#else
constexpr uint32_t kClearedFreeMemoryValue = 0;
constexpr uint32_t kZapValue = 0xdeadbeef;
constexpr uint32_t kHandleZapValue = 0xbaddeaf;
constexpr uint32_t kGlobalHandleZapValue = 0xbaffedf;
constexpr uint32_t kFromSpaceZapValue = 0xbeefdaf;
constexpr uint32_t kSlotsZapValue = 0xbeefdeef;
constexpr uint32_t kDebugZapValue = 0xbadbaddb;
constexpr uint32_t kFreeListZapValue = 0xfeed1eaf;
#endif
constexpr int kCodeZapValue = 0xbadc0de;
constexpr uint32_t kPhantomReferenceZap = 0xca11bac;
// Page constants.
static const intptr_t kPageAlignmentMask = (intptr_t{1} << kPageSizeBits) - 1;
// On Intel architecture, cache line size is 64 bytes.
// On ARM it may be less (32 bytes), but as far this constant is
// used for aligning data, it doesn't hurt to align on a greater value.
#define PROCESSOR_CACHE_LINE_SIZE 64
// Constants relevant to double precision floating point numbers.
// If looking only at the top 32 bits, the QNaN mask is bits 19 to 30.
constexpr uint32_t kQuietNaNHighBitsMask = 0xfff << (51 - 32);
// -----------------------------------------------------------------------------
// Forward declarations for frequently used classes
class AccessorInfo;
class Arguments;
class Assembler;
class Code;
class CodeSpace;
class CodeStub;
class Context;
class Debug;
class DebugInfo;
class Descriptor;
class DescriptorArray;
class TransitionArray;
class ExternalReference;
class FixedArray;
class FreeStoreAllocationPolicy;
class FunctionTemplateInfo;
class MemoryChunk;
class NumberDictionary;
class SimpleNumberDictionary;
class NameDictionary;
class GlobalDictionary;
template <typename T> class MaybeHandle;
template <typename T> class Handle;
class Heap;
class HeapObject;
class HeapObjectReference;
class IC;
class InterceptorInfo;
class Isolate;
class JSReceiver;
class JSArray;
class JSFunction;
class JSObject;
class LargeObjectSpace;
class MacroAssembler;
class Map;
class MapSpace;
class MarkCompactCollector;
class MaybeObject;
class NewSpace;
class NewLargeObjectSpace;
class Object;
class OldSpace;
class ParameterCount;
class ReadOnlySpace;
class Foreign;
class Scope;
class DeclarationScope;
class ModuleScope;
class ScopeInfo;
class Script;
class Smi;
template <typename Config, class Allocator = FreeStoreAllocationPolicy>
class SplayTree;
class String;
class Symbol;
class Name;
class Struct;
class FeedbackVector;
class Variable;
class RelocInfo;
class MessageLocation;
typedef bool (*WeakSlotCallback)(Object** pointer);
typedef bool (*WeakSlotCallbackWithHeap)(Heap* heap, Object** pointer);
// -----------------------------------------------------------------------------
// Miscellaneous
// NOTE: SpaceIterator depends on AllocationSpace enumeration values being
// consecutive.
enum AllocationSpace {
// TODO(v8:7464): Actually map this space's memory as read-only.
RO_SPACE, // Immortal, immovable and immutable objects,
NEW_SPACE, // Young generation semispaces for regular objects collected with
// Scavenger.
OLD_SPACE, // Old generation regular object space.
CODE_SPACE, // Old generation code object space, marked executable.
MAP_SPACE, // Old generation map object space, non-movable.
LO_SPACE, // Old generation large object space.
NEW_LO_SPACE, // Young generation large object space.
FIRST_SPACE = RO_SPACE,
LAST_SPACE = NEW_LO_SPACE,
FIRST_GROWABLE_PAGED_SPACE = OLD_SPACE,
LAST_GROWABLE_PAGED_SPACE = MAP_SPACE
};
constexpr int kSpaceTagSize = 3;
STATIC_ASSERT(FIRST_SPACE == 0);
enum AllocationAlignment { kWordAligned, kDoubleAligned, kDoubleUnaligned };
enum class AccessMode { ATOMIC, NON_ATOMIC };
// Supported write barrier modes.
enum WriteBarrierKind : uint8_t {
kNoWriteBarrier,
kMapWriteBarrier,
kPointerWriteBarrier,
kFullWriteBarrier
};
inline size_t hash_value(WriteBarrierKind kind) {
return static_cast<uint8_t>(kind);
}
inline std::ostream& operator<<(std::ostream& os, WriteBarrierKind kind) {
switch (kind) {
case kNoWriteBarrier:
return os << "NoWriteBarrier";
case kMapWriteBarrier:
return os << "MapWriteBarrier";
case kPointerWriteBarrier:
return os << "PointerWriteBarrier";
case kFullWriteBarrier:
return os << "FullWriteBarrier";
}
UNREACHABLE();
}
// A flag that indicates whether objects should be pretenured when
// allocated (allocated directly into either the old generation or read-only
// space), or not (allocated in the young generation if the object size and type
// allows).
enum PretenureFlag { NOT_TENURED, TENURED, TENURED_READ_ONLY };
inline std::ostream& operator<<(std::ostream& os, const PretenureFlag& flag) {
switch (flag) {
case NOT_TENURED:
return os << "NotTenured";
case TENURED:
return os << "Tenured";
case TENURED_READ_ONLY:
return os << "TenuredReadOnly";
}
UNREACHABLE();
}
enum MinimumCapacity {
USE_DEFAULT_MINIMUM_CAPACITY,
USE_CUSTOM_MINIMUM_CAPACITY
};
enum GarbageCollector { SCAVENGER, MARK_COMPACTOR, MINOR_MARK_COMPACTOR };
enum Executability { NOT_EXECUTABLE, EXECUTABLE };
enum Movability { kMovable, kImmovable };
enum VisitMode {
VISIT_ALL,
VISIT_ALL_IN_MINOR_MC_MARK,
VISIT_ALL_IN_MINOR_MC_UPDATE,
VISIT_ALL_IN_SCAVENGE,
VISIT_ALL_IN_SWEEP_NEWSPACE,
VISIT_ONLY_STRONG,
VISIT_FOR_SERIALIZATION,
};
// Flag indicating whether code is built into the VM (one of the natives files).
enum NativesFlag {
NOT_NATIVES_CODE,
EXTENSION_CODE,
NATIVES_CODE,
INSPECTOR_CODE
};
// ParseRestriction is used to restrict the set of valid statements in a
// unit of compilation. Restriction violations cause a syntax error.
enum ParseRestriction {
NO_PARSE_RESTRICTION, // All expressions are allowed.
ONLY_SINGLE_FUNCTION_LITERAL // Only a single FunctionLiteral expression.
};
// A CodeDesc describes a buffer holding instructions and relocation
// information. The instructions start at the beginning of the buffer
// and grow forward, the relocation information starts at the end of
// the buffer and grows backward. A constant pool may exist at the
// end of the instructions.
//
// |<--------------- buffer_size ----------------------------------->|
// |<------------- instr_size ---------->| |<-- reloc_size -->|
// | |<- const_pool_size ->| |
// +=====================================+========+==================+
// | instructions | data | free | reloc info |
// +=====================================+========+==================+
// ^
// |
// buffer
struct CodeDesc {
byte* buffer;
int buffer_size;
int instr_size;
int reloc_size;
int constant_pool_size;
byte* unwinding_info;
int unwinding_info_size;
Assembler* origin;
};
// Callback function used for checking constraints when copying/relocating
// objects. Returns true if an object can be copied/relocated from its
// old_addr to a new_addr.
typedef bool (*ConstraintCallback)(Address new_addr, Address old_addr);
// Callback function on inline caches, used for iterating over inline caches
// in compiled code.
typedef void (*InlineCacheCallback)(Code* code, Address ic);
// State for inline cache call sites. Aliased as IC::State.
enum InlineCacheState {
// Has never been executed.
UNINITIALIZED,
// Has been executed but monomorhic state has been delayed.
PREMONOMORPHIC,
// Has been executed and only one receiver type has been seen.
MONOMORPHIC,
// Check failed due to prototype (or map deprecation).
RECOMPUTE_HANDLER,
// Multiple receiver types have been seen.
POLYMORPHIC,
// Many receiver types have been seen.
MEGAMORPHIC,
// A generic handler is installed and no extra typefeedback is recorded.
GENERIC,
};
enum WhereToStart { kStartAtReceiver, kStartAtPrototype };
enum ResultSentinel { kNotFound = -1, kUnsupported = -2 };
enum ShouldThrow { kThrowOnError, kDontThrow };
// The Store Buffer (GC).
typedef enum {
kStoreBufferFullEvent,
kStoreBufferStartScanningPagesEvent,
kStoreBufferScanningPageEvent
} StoreBufferEvent;
typedef void (*StoreBufferCallback)(Heap* heap,
MemoryChunk* page,
StoreBufferEvent event);
// Union used for customized checking of the IEEE double types
// inlined within v8 runtime, rather than going to the underlying
// platform headers and libraries
union IeeeDoubleLittleEndianArchType {
double d;
struct {
unsigned int man_low :32;
unsigned int man_high :20;
unsigned int exp :11;
unsigned int sign :1;
} bits;
};
union IeeeDoubleBigEndianArchType {
double d;
struct {
unsigned int sign :1;
unsigned int exp :11;
unsigned int man_high :20;
unsigned int man_low :32;
} bits;
};
#if V8_TARGET_LITTLE_ENDIAN
typedef IeeeDoubleLittleEndianArchType IeeeDoubleArchType;
constexpr int kIeeeDoubleMantissaWordOffset = 0;
constexpr int kIeeeDoubleExponentWordOffset = 4;
#else
typedef IeeeDoubleBigEndianArchType IeeeDoubleArchType;
constexpr int kIeeeDoubleMantissaWordOffset = 4;
constexpr int kIeeeDoubleExponentWordOffset = 0;
#endif
// -----------------------------------------------------------------------------
// Macros
// Testers for test.
#define HAS_SMI_TAG(value) \
((reinterpret_cast<intptr_t>(value) & ::i::kSmiTagMask) == ::i::kSmiTag)
#define HAS_HEAP_OBJECT_TAG(value) \
(((reinterpret_cast<intptr_t>(value) & ::i::kHeapObjectTagMask) == \
::i::kHeapObjectTag))
// OBJECT_POINTER_ALIGN returns the value aligned as a HeapObject pointer
#define OBJECT_POINTER_ALIGN(value) \
(((value) + kObjectAlignmentMask) & ~kObjectAlignmentMask)
// POINTER_SIZE_ALIGN returns the value aligned as a pointer.
#define POINTER_SIZE_ALIGN(value) \
(((value) + kPointerAlignmentMask) & ~kPointerAlignmentMask)
// CODE_POINTER_ALIGN returns the value aligned as a generated code segment.
#define CODE_POINTER_ALIGN(value) \
(((value) + kCodeAlignmentMask) & ~kCodeAlignmentMask)
// DOUBLE_POINTER_ALIGN returns the value algined for double pointers.
#define DOUBLE_POINTER_ALIGN(value) \
(((value) + kDoubleAlignmentMask) & ~kDoubleAlignmentMask)
// CPU feature flags.
enum CpuFeature {
// x86
SSE4_1,
SSSE3,
SSE3,
SAHF,
AVX,
FMA3,
BMI1,
BMI2,
LZCNT,
POPCNT,
ATOM,
// ARM
// - Standard configurations. The baseline is ARMv6+VFPv2.
ARMv7, // ARMv7-A + VFPv3-D32 + NEON
ARMv7_SUDIV, // ARMv7-A + VFPv4-D32 + NEON + SUDIV
ARMv8, // ARMv8-A (+ all of the above)
// MIPS, MIPS64
FPU,
FP64FPU,
MIPSr1,
MIPSr2,
MIPSr6,
MIPS_SIMD, // MSA instructions
// PPC
FPR_GPR_MOV,
LWSYNC,
ISELECT,
VSX,
MODULO,
// S390
DISTINCT_OPS,
GENERAL_INSTR_EXT,
FLOATING_POINT_EXT,
VECTOR_FACILITY,
MISC_INSTR_EXT2,
NUMBER_OF_CPU_FEATURES,
// ARM feature aliases (based on the standard configurations above).
VFPv3 = ARMv7,
NEON = ARMv7,
VFP32DREGS = ARMv7,
SUDIV = ARMv7_SUDIV
};
// Defines hints about receiver values based on structural knowledge.
enum class ConvertReceiverMode : unsigned {
kNullOrUndefined, // Guaranteed to be null or undefined.
kNotNullOrUndefined, // Guaranteed to never be null or undefined.
kAny // No specific knowledge about receiver.
};
inline size_t hash_value(ConvertReceiverMode mode) {
return bit_cast<unsigned>(mode);
}
inline std::ostream& operator<<(std::ostream& os, ConvertReceiverMode mode) {
switch (mode) {
case ConvertReceiverMode::kNullOrUndefined:
return os << "NULL_OR_UNDEFINED";
case ConvertReceiverMode::kNotNullOrUndefined:
return os << "NOT_NULL_OR_UNDEFINED";
case ConvertReceiverMode::kAny:
return os << "ANY";
}
UNREACHABLE();
}
// Valid hints for the abstract operation OrdinaryToPrimitive,
// implemented according to ES6, section 7.1.1.
enum class OrdinaryToPrimitiveHint { kNumber, kString };
// Valid hints for the abstract operation ToPrimitive,
// implemented according to ES6, section 7.1.1.
enum class ToPrimitiveHint { kDefault, kNumber, kString };
// Defines specifics about arguments object or rest parameter creation.
enum class CreateArgumentsType : uint8_t {
kMappedArguments,
kUnmappedArguments,
kRestParameter
};
inline size_t hash_value(CreateArgumentsType type) {
return bit_cast<uint8_t>(type);
}
inline std::ostream& operator<<(std::ostream& os, CreateArgumentsType type) {
switch (type) {
case CreateArgumentsType::kMappedArguments:
return os << "MAPPED_ARGUMENTS";
case CreateArgumentsType::kUnmappedArguments:
return os << "UNMAPPED_ARGUMENTS";
case CreateArgumentsType::kRestParameter:
return os << "REST_PARAMETER";
}
UNREACHABLE();
}
enum ScopeType : uint8_t {
EVAL_SCOPE, // The top-level scope for an eval source.
FUNCTION_SCOPE, // The top-level scope for a function.
MODULE_SCOPE, // The scope introduced by a module literal
SCRIPT_SCOPE, // The top-level scope for a script or a top-level eval.
CATCH_SCOPE, // The scope introduced by catch.
BLOCK_SCOPE, // The scope introduced by a new block.
WITH_SCOPE // The scope introduced by with.
};
inline std::ostream& operator<<(std::ostream& os, ScopeType type) {
switch (type) {
case ScopeType::EVAL_SCOPE:
return os << "EVAL_SCOPE";
case ScopeType::FUNCTION_SCOPE:
return os << "FUNCTION_SCOPE";
case ScopeType::MODULE_SCOPE:
return os << "MODULE_SCOPE";
case ScopeType::SCRIPT_SCOPE:
return os << "SCRIPT_SCOPE";
case ScopeType::CATCH_SCOPE:
return os << "CATCH_SCOPE";
case ScopeType::BLOCK_SCOPE:
return os << "BLOCK_SCOPE";
case ScopeType::WITH_SCOPE:
return os << "WITH_SCOPE";
}
UNREACHABLE();
}
// AllocationSiteMode controls whether allocations are tracked by an allocation
// site.
enum AllocationSiteMode {
DONT_TRACK_ALLOCATION_SITE,
TRACK_ALLOCATION_SITE,
LAST_ALLOCATION_SITE_MODE = TRACK_ALLOCATION_SITE
};
// The mips architecture prior to revision 5 has inverted encoding for sNaN.
#if (V8_TARGET_ARCH_MIPS && !defined(_MIPS_ARCH_MIPS32R6) && \
(!defined(USE_SIMULATOR) || !defined(_MIPS_TARGET_SIMULATOR))) || \
(V8_TARGET_ARCH_MIPS64 && !defined(_MIPS_ARCH_MIPS64R6) && \
(!defined(USE_SIMULATOR) || !defined(_MIPS_TARGET_SIMULATOR)))
constexpr uint32_t kHoleNanUpper32 = 0xFFFF7FFF;
constexpr uint32_t kHoleNanLower32 = 0xFFFF7FFF;
#else
constexpr uint32_t kHoleNanUpper32 = 0xFFF7FFFF;
constexpr uint32_t kHoleNanLower32 = 0xFFF7FFFF;
#endif
constexpr uint64_t kHoleNanInt64 =
(static_cast<uint64_t>(kHoleNanUpper32) << 32) | kHoleNanLower32;
// ES6 section 20.1.2.6 Number.MAX_SAFE_INTEGER
constexpr double kMaxSafeInteger = 9007199254740991.0; // 2^53-1
// The order of this enum has to be kept in sync with the predicates below.
enum class VariableMode : uint8_t {
// User declared variables:
kLet, // declared via 'let' declarations (first lexical)
kConst, // declared via 'const' declarations (last lexical)
kVar, // declared via 'var', and 'function' declarations
// Variables introduced by the compiler:
kTemporary, // temporary variables (not user-visible), stack-allocated
// unless the scope as a whole has forced context allocation
kDynamic, // always require dynamic lookup (we don't know
// the declaration)
kDynamicGlobal, // requires dynamic lookup, but we know that the
// variable is global unless it has been shadowed
// by an eval-introduced variable
kDynamicLocal // requires dynamic lookup, but we know that the
// variable is local and where it is unless it
// has been shadowed by an eval-introduced
// variable
};
// Printing support
#ifdef DEBUG
inline const char* VariableMode2String(VariableMode mode) {
switch (mode) {
case VariableMode::kVar:
return "VAR";
case VariableMode::kLet:
return "LET";
case VariableMode::kConst:
return "CONST";
case VariableMode::kDynamic:
return "DYNAMIC";
case VariableMode::kDynamicGlobal:
return "DYNAMIC_GLOBAL";
case VariableMode::kDynamicLocal:
return "DYNAMIC_LOCAL";
case VariableMode::kTemporary:
return "TEMPORARY";
}
UNREACHABLE();
}
#endif
enum VariableKind : uint8_t {
NORMAL_VARIABLE,
FUNCTION_VARIABLE,
THIS_VARIABLE,
SLOPPY_FUNCTION_NAME_VARIABLE
};
inline bool IsDynamicVariableMode(VariableMode mode) {
return mode >= VariableMode::kDynamic && mode <= VariableMode::kDynamicLocal;
}
inline bool IsDeclaredVariableMode(VariableMode mode) {
STATIC_ASSERT(static_cast<uint8_t>(VariableMode::kLet) ==
0); // Implies that mode >= VariableMode::kLet.
return mode <= VariableMode::kVar;
}
inline bool IsLexicalVariableMode(VariableMode mode) {
STATIC_ASSERT(static_cast<uint8_t>(VariableMode::kLet) ==
0); // Implies that mode >= VariableMode::kLet.
return mode <= VariableMode::kConst;
}
enum VariableLocation : uint8_t {
// Before and during variable allocation, a variable whose location is
// not yet determined. After allocation, a variable looked up as a
// property on the global object (and possibly absent). name() is the
// variable name, index() is invalid.
UNALLOCATED,
// A slot in the parameter section on the stack. index() is the
// parameter index, counting left-to-right. The receiver is index -1;
// the first parameter is index 0.
PARAMETER,
// A slot in the local section on the stack. index() is the variable
// index in the stack frame, starting at 0.
LOCAL,
// An indexed slot in a heap context. index() is the variable index in
// the context object on the heap, starting at 0. scope() is the
// corresponding scope.
CONTEXT,
// A named slot in a heap context. name() is the variable name in the
// context object on the heap, with lookup starting at the current
// context. index() is invalid.
LOOKUP,
// A named slot in a module's export table.
MODULE,
kLastVariableLocation = MODULE
};
// ES6 specifies declarative environment records with mutable and immutable
// bindings that can be in two states: initialized and uninitialized.
// When accessing a binding, it needs to be checked for initialization.
// However in the following cases the binding is initialized immediately
// after creation so the initialization check can always be skipped:
//
// 1. Var declared local variables.
// var foo;
// 2. A local variable introduced by a function declaration.
// function foo() {}
// 3. Parameters
// function x(foo) {}
// 4. Catch bound variables.
// try {} catch (foo) {}
// 6. Function name variables of named function expressions.
// var x = function foo() {}
// 7. Implicit binding of 'this'.
// 8. Implicit binding of 'arguments' in functions.
//
// The following enum specifies a flag that indicates if the binding needs a
// distinct initialization step (kNeedsInitialization) or if the binding is
// immediately initialized upon creation (kCreatedInitialized).
enum InitializationFlag : uint8_t { kNeedsInitialization, kCreatedInitialized };
enum MaybeAssignedFlag : uint8_t { kNotAssigned, kMaybeAssigned };
enum ParseErrorType { kSyntaxError = 0, kReferenceError = 1 };
enum FunctionKind : uint8_t {
kNormalFunction,
kArrowFunction,
kGeneratorFunction,
kConciseMethod,
kDerivedConstructor,
kBaseConstructor,
kGetterFunction,
kSetterFunction,
kAsyncFunction,
kModule,
kClassFieldsInitializerFunction,
kDefaultBaseConstructor,
kDefaultDerivedConstructor,
kAsyncArrowFunction,
kAsyncConciseMethod,
kConciseGeneratorMethod,
kAsyncConciseGeneratorMethod,
kAsyncGeneratorFunction,
kLastFunctionKind = kAsyncGeneratorFunction,
};
inline bool IsArrowFunction(FunctionKind kind) {
return kind == FunctionKind::kArrowFunction ||
kind == FunctionKind::kAsyncArrowFunction;
}
inline bool IsModule(FunctionKind kind) {
return kind == FunctionKind::kModule;
}
inline bool IsAsyncGeneratorFunction(FunctionKind kind) {
return kind == FunctionKind::kAsyncGeneratorFunction ||
kind == FunctionKind::kAsyncConciseGeneratorMethod;
}
inline bool IsGeneratorFunction(FunctionKind kind) {
return kind == FunctionKind::kGeneratorFunction ||
kind == FunctionKind::kConciseGeneratorMethod ||
IsAsyncGeneratorFunction(kind);
}
inline bool IsAsyncFunction(FunctionKind kind) {
return kind == FunctionKind::kAsyncFunction ||
kind == FunctionKind::kAsyncArrowFunction ||
kind == FunctionKind::kAsyncConciseMethod ||
IsAsyncGeneratorFunction(kind);
}
inline bool IsResumableFunction(FunctionKind kind) {
return IsGeneratorFunction(kind) || IsAsyncFunction(kind) || IsModule(kind);
}
inline bool IsConciseMethod(FunctionKind kind) {
return kind == FunctionKind::kConciseMethod ||
kind == FunctionKind::kConciseGeneratorMethod ||
kind == FunctionKind::kAsyncConciseMethod ||
kind == FunctionKind::kAsyncConciseGeneratorMethod ||
kind == FunctionKind::kClassFieldsInitializerFunction;
}
inline bool IsGetterFunction(FunctionKind kind) {
return kind == FunctionKind::kGetterFunction;
}
inline bool IsSetterFunction(FunctionKind kind) {
return kind == FunctionKind::kSetterFunction;
}
inline bool IsAccessorFunction(FunctionKind kind) {
return kind == FunctionKind::kGetterFunction ||
kind == FunctionKind::kSetterFunction;
}
inline bool IsDefaultConstructor(FunctionKind kind) {
return kind == FunctionKind::kDefaultBaseConstructor ||
kind == FunctionKind::kDefaultDerivedConstructor;
}
inline bool IsBaseConstructor(FunctionKind kind) {
return kind == FunctionKind::kBaseConstructor ||
kind == FunctionKind::kDefaultBaseConstructor;
}
inline bool IsDerivedConstructor(FunctionKind kind) {
return kind == FunctionKind::kDerivedConstructor ||
kind == FunctionKind::kDefaultDerivedConstructor;
}
inline bool IsClassConstructor(FunctionKind kind) {
return IsBaseConstructor(kind) || IsDerivedConstructor(kind);
}
inline bool IsClassFieldsInitializerFunction(FunctionKind kind) {
return kind == FunctionKind::kClassFieldsInitializerFunction;
}
inline bool IsConstructable(FunctionKind kind) {
if (IsAccessorFunction(kind)) return false;
if (IsConciseMethod(kind)) return false;
if (IsArrowFunction(kind)) return false;
if (IsGeneratorFunction(kind)) return false;
if (IsAsyncFunction(kind)) return false;
return true;
}
inline std::ostream& operator<<(std::ostream& os, FunctionKind kind) {
switch (kind) {
case FunctionKind::kNormalFunction:
return os << "NormalFunction";
case FunctionKind::kArrowFunction:
return os << "ArrowFunction";
case FunctionKind::kGeneratorFunction:
return os << "GeneratorFunction";
case FunctionKind::kConciseMethod:
return os << "ConciseMethod";
case FunctionKind::kDerivedConstructor:
return os << "DerivedConstructor";
case FunctionKind::kBaseConstructor:
return os << "BaseConstructor";
case FunctionKind::kGetterFunction:
return os << "GetterFunction";
case FunctionKind::kSetterFunction:
return os << "SetterFunction";
case FunctionKind::kAsyncFunction:
return os << "AsyncFunction";
case FunctionKind::kModule:
return os << "Module";
case FunctionKind::kClassFieldsInitializerFunction:
return os << "ClassFieldsInitializerFunction";
case FunctionKind::kDefaultBaseConstructor:
return os << "DefaultBaseConstructor";
case FunctionKind::kDefaultDerivedConstructor:
return os << "DefaultDerivedConstructor";
case FunctionKind::kAsyncArrowFunction:
return os << "AsyncArrowFunction";
case FunctionKind::kAsyncConciseMethod:
return os << "AsyncConciseMethod";
case FunctionKind::kConciseGeneratorMethod:
return os << "ConciseGeneratorMethod";
case FunctionKind::kAsyncConciseGeneratorMethod:
return os << "AsyncConciseGeneratorMethod";
case FunctionKind::kAsyncGeneratorFunction:
return os << "AsyncGeneratorFunction";
}
UNREACHABLE();
}
enum class InterpreterPushArgsMode : unsigned {
kArrayFunction,
kWithFinalSpread,
kOther
};
inline size_t hash_value(InterpreterPushArgsMode mode) {
return bit_cast<unsigned>(mode);
}
inline std::ostream& operator<<(std::ostream& os,
InterpreterPushArgsMode mode) {
switch (mode) {
case InterpreterPushArgsMode::kArrayFunction:
return os << "ArrayFunction";
case InterpreterPushArgsMode::kWithFinalSpread:
return os << "WithFinalSpread";
case InterpreterPushArgsMode::kOther:
return os << "Other";
}
UNREACHABLE();
}
inline uint32_t ObjectHash(Address address) {
// All objects are at least pointer aligned, so we can remove the trailing
// zeros.
return static_cast<uint32_t>(address >> kPointerSizeLog2);
}
// Type feedback is encoded in such a way that, we can combine the feedback
// at different points by performing an 'OR' operation. Type feedback moves
// to a more generic type when we combine feedback.
//
// kSignedSmall -> kSignedSmallInputs -> kNumber -> kNumberOrOddball -> kAny
// kString -> kAny
// kBigInt -> kAny
//
// Technically we wouldn't need the separation between the kNumber and the
// kNumberOrOddball values here, since for binary operations, we always
// truncate oddballs to numbers. In practice though it causes TurboFan to
// generate quite a lot of unused code though if we always handle numbers
// and oddballs everywhere, although in 99% of the use sites they are only
// used with numbers.
class BinaryOperationFeedback {
public:
enum {
kNone = 0x0,
kSignedSmall = 0x1,
kSignedSmallInputs = 0x3,
kNumber = 0x7,
kNumberOrOddball = 0xF,
kString = 0x10,
kBigInt = 0x20,
kAny = 0x7F
};
};
// Type feedback is encoded in such a way that, we can combine the feedback
// at different points by performing an 'OR' operation. Type feedback moves
// to a more generic type when we combine feedback.
//
// kSignedSmall -> kNumber -> kNumberOrOddball -> kAny
// kInternalizedString -> kString -> kAny
// kSymbol -> kAny
// kBigInt -> kAny
// kReceiver -> kAny
//
// This is distinct from BinaryOperationFeedback on purpose, because the
// feedback that matters differs greatly as well as the way it is consumed.
class CompareOperationFeedback {
public:
enum {
kNone = 0x00,
kSignedSmall = 0x01,
kNumber = 0x3,
kNumberOrOddball = 0x7,
kInternalizedString = 0x8,
kString = 0x18,
kSymbol = 0x20,
kBigInt = 0x30,
kReceiver = 0x40,
kAny = 0xff
};
};
enum class Operation {
// Binary operations.
kAdd,
kSubtract,
kMultiply,
kDivide,
kModulus,
kExponentiate,
kBitwiseAnd,
kBitwiseOr,
kBitwiseXor,
kShiftLeft,
kShiftRight,
kShiftRightLogical,
// Unary operations.
kBitwiseNot,
kNegate,
kIncrement,
kDecrement,
// Compare operations.
kEqual,
kStrictEqual,
kLessThan,
kLessThanOrEqual,
kGreaterThan,
kGreaterThanOrEqual,
};
// Type feedback is encoded in such a way that, we can combine the feedback
// at different points by performing an 'OR' operation. Type feedback moves
// to a more generic type when we combine feedback.
// kNone -> kEnumCacheKeysAndIndices -> kEnumCacheKeys -> kAny
class ForInFeedback {
public:
enum {
kNone = 0x0,
kEnumCacheKeysAndIndices = 0x1,
kEnumCacheKeys = 0x3,
kAny = 0x7
};
};
STATIC_ASSERT((ForInFeedback::kNone |
ForInFeedback::kEnumCacheKeysAndIndices) ==
ForInFeedback::kEnumCacheKeysAndIndices);
STATIC_ASSERT((ForInFeedback::kEnumCacheKeysAndIndices |
ForInFeedback::kEnumCacheKeys) == ForInFeedback::kEnumCacheKeys);
STATIC_ASSERT((ForInFeedback::kEnumCacheKeys | ForInFeedback::kAny) ==
ForInFeedback::kAny);
enum class UnicodeEncoding : uint8_t {
// Different unicode encodings in a |word32|:
UTF16, // hi 16bits -> trailing surrogate or 0, low 16bits -> lead surrogate
UTF32, // full UTF32 code unit / Unicode codepoint
};
inline size_t hash_value(UnicodeEncoding encoding) {
return static_cast<uint8_t>(encoding);
}
inline std::ostream& operator<<(std::ostream& os, UnicodeEncoding encoding) {
switch (encoding) {
case UnicodeEncoding::UTF16:
return os << "UTF16";
case UnicodeEncoding::UTF32:
return os << "UTF32";
}
UNREACHABLE();
}
enum class IterationKind { kKeys, kValues, kEntries };
inline std::ostream& operator<<(std::ostream& os, IterationKind kind) {
switch (kind) {
case IterationKind::kKeys:
return os << "IterationKind::kKeys";
case IterationKind::kValues:
return os << "IterationKind::kValues";
case IterationKind::kEntries:
return os << "IterationKind::kEntries";
}
UNREACHABLE();
}
enum class CollectionKind { kMap, kSet };
inline std::ostream& operator<<(std::ostream& os, CollectionKind kind) {
switch (kind) {
case CollectionKind::kMap:
return os << "CollectionKind::kMap";
case CollectionKind::kSet:
return os << "CollectionKind::kSet";
}
UNREACHABLE();
}
// Flags for the runtime function kDefineDataPropertyInLiteral. A property can
// be enumerable or not, and, in case of functions, the function name
// can be set or not.
enum class DataPropertyInLiteralFlag {
kNoFlags = 0,
kDontEnum = 1 << 0,
kSetFunctionName = 1 << 1
};
typedef base::Flags<DataPropertyInLiteralFlag> DataPropertyInLiteralFlags;
DEFINE_OPERATORS_FOR_FLAGS(DataPropertyInLiteralFlags)
enum ExternalArrayType {
kExternalInt8Array = 1,
kExternalUint8Array,
kExternalInt16Array,
kExternalUint16Array,
kExternalInt32Array,
kExternalUint32Array,
kExternalFloat32Array,
kExternalFloat64Array,
kExternalUint8ClampedArray,
kExternalBigInt64Array,
kExternalBigUint64Array,
};
struct AssemblerDebugInfo {
AssemblerDebugInfo(const char* name, const char* file, int line)
: name(name), file(file), line(line) {}
const char* name;
const char* file;
int line;
};
inline std::ostream& operator<<(std::ostream& os,
const AssemblerDebugInfo& info) {
os << "(" << info.name << ":" << info.file << ":" << info.line << ")";
return os;
}
enum class OptimizationMarker {
kLogFirstExecution,
kNone,
kCompileOptimized,
kCompileOptimizedConcurrent,
kInOptimizationQueue
};
inline std::ostream& operator<<(std::ostream& os,
const OptimizationMarker& marker) {
switch (marker) {
case OptimizationMarker::kLogFirstExecution:
return os << "OptimizationMarker::kLogFirstExecution";
case OptimizationMarker::kNone:
return os << "OptimizationMarker::kNone";
case OptimizationMarker::kCompileOptimized:
return os << "OptimizationMarker::kCompileOptimized";
case OptimizationMarker::kCompileOptimizedConcurrent:
return os << "OptimizationMarker::kCompileOptimizedConcurrent";
case OptimizationMarker::kInOptimizationQueue:
return os << "OptimizationMarker::kInOptimizationQueue";
}
UNREACHABLE();
return os;
}
enum class SpeculationMode { kAllowSpeculation, kDisallowSpeculation };
inline std::ostream& operator<<(std::ostream& os,
SpeculationMode speculation_mode) {
switch (speculation_mode) {
case SpeculationMode::kAllowSpeculation:
return os << "SpeculationMode::kAllowSpeculation";
case SpeculationMode::kDisallowSpeculation:
return os << "SpeculationMode::kDisallowSpeculation";
}
UNREACHABLE();
return os;
}
enum class BlockingBehavior { kBlock, kDontBlock };
enum class ConcurrencyMode { kNotConcurrent, kConcurrent };
#define FOR_EACH_ISOLATE_ADDRESS_NAME(C) \
C(Handler, handler) \
C(CEntryFP, c_entry_fp) \
C(CFunction, c_function) \
C(Context, context) \
C(PendingException, pending_exception) \
C(PendingHandlerContext, pending_handler_context) \
C(PendingHandlerEntrypoint, pending_handler_entrypoint) \
C(PendingHandlerConstantPool, pending_handler_constant_pool) \
C(PendingHandlerFP, pending_handler_fp) \
C(PendingHandlerSP, pending_handler_sp) \
C(ExternalCaughtException, external_caught_exception) \
C(JSEntrySP, js_entry_sp)
enum IsolateAddressId {
#define DECLARE_ENUM(CamelName, hacker_name) k##CamelName##Address,
FOR_EACH_ISOLATE_ADDRESS_NAME(DECLARE_ENUM)
#undef DECLARE_ENUM
kIsolateAddressCount
};
V8_INLINE static bool HasWeakHeapObjectTag(const internal::MaybeObject* value) {
return ((reinterpret_cast<intptr_t>(value) & kHeapObjectTagMask) ==
kWeakHeapObjectTag);
}
// Object* should never have the weak tag; this variant is for overzealous
// checking.
V8_INLINE static bool HasWeakHeapObjectTag(const Object* value) {
return ((reinterpret_cast<intptr_t>(value) & kHeapObjectTagMask) ==
kWeakHeapObjectTag);
}
V8_INLINE static bool IsClearedWeakHeapObject(const MaybeObject* value) {
return reinterpret_cast<intptr_t>(value) == kClearedWeakHeapObject;
}
V8_INLINE static HeapObject* RemoveWeakHeapObjectMask(
HeapObjectReference* value) {
return reinterpret_cast<HeapObject*>(reinterpret_cast<intptr_t>(value) &
~kWeakHeapObjectMask);
}
V8_INLINE static HeapObjectReference* AddWeakHeapObjectMask(Object* value) {
return reinterpret_cast<HeapObjectReference*>(
reinterpret_cast<intptr_t>(value) | kWeakHeapObjectMask);
}
V8_INLINE static MaybeObject* AddWeakHeapObjectMask(MaybeObject* value) {
return reinterpret_cast<MaybeObject*>(reinterpret_cast<intptr_t>(value) |
kWeakHeapObjectMask);
}
enum class HeapObjectReferenceType {
WEAK,
STRONG,
};
enum class PoisoningMitigationLevel {
kPoisonAll,
kDontPoison,
kPoisonCriticalOnly
};
enum class LoadSensitivity {
kCritical, // Critical loads are poisoned whenever we can run untrusted
// code (i.e., when --untrusted-code-mitigations is on).
kUnsafe, // Unsafe loads are poisoned when full poisoning is on
// (--branch-load-poisoning).
kSafe // Safe loads are never poisoned.
};
// The reason for a WebAssembly trap.
#define FOREACH_WASM_TRAPREASON(V) \
V(TrapUnreachable) \
V(TrapMemOutOfBounds) \
V(TrapUnalignedAccess) \
V(TrapDivByZero) \
V(TrapDivUnrepresentable) \
V(TrapRemByZero) \
V(TrapFloatUnrepresentable) \
V(TrapFuncInvalid) \
V(TrapFuncSigMismatch)
} // namespace internal
} // namespace v8
namespace i = v8::internal;
#endif // V8_GLOBALS_H_