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1039 lines (885 loc) · 30.5 KB
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/*
* Copyright (C) 2015-2026 Apple Inc. All rights reserved.
* Copyright (C) 2022 the V8 project authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/Compiler.h>
#include <wtf/Platform.h>
#if ENABLE(WEBASSEMBLY)
#include <JavaScriptCore/CCallHelpers.h>
#include <JavaScriptCore/CallLinkInfo.h>
#include <JavaScriptCore/CodeLocation.h>
#include <JavaScriptCore/Identifier.h>
#include <JavaScriptCore/JSString.h>
#include <JavaScriptCore/MacroAssemblerCodeRef.h>
#include <JavaScriptCore/MathCommon.h>
#include <JavaScriptCore/PageCount.h>
#include <JavaScriptCore/RegisterAtOffsetList.h>
#include <JavaScriptCore/WasmAddressType.h>
#include <JavaScriptCore/WasmMemoryInformation.h>
#include <JavaScriptCore/WasmName.h>
#include <JavaScriptCore/WasmNameSection.h>
#include <JavaScriptCore/WasmOps.h>
#include <JavaScriptCore/WasmTypeDefinition.h>
#include <cstdint>
#include <limits>
#include <memory>
#include <wtf/FixedBitVector.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Variant.h>
#include <wtf/Vector.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
class Compilation;
namespace Wasm {
struct CompilationContext;
struct ModuleInformation;
struct UnlinkedHandlerInfo;
class BlockSignature {
WTF_MAKE_TZONE_ALLOCATED(BlockSignature);
public:
BlockSignature()
: m_storage(Types::Void)
{
}
// Constructor for simple case: no arguments, single return type (or void)
explicit BlockSignature(Type resultType)
: m_storage(resultType)
{
}
// Constructor from RTT held by Wasm::Module.
explicit BlockSignature(const RTT& signature)
: m_storage(&signature)
{
ASSERT(signature.kind() == RTTKind::Function);
}
unsigned argumentCount() const
{
return WTF::switchOn(m_storage,
[](const RTT* signature) -> unsigned {
return signature->argumentCount();
},
[](Type) -> unsigned {
return 0;
}
);
}
unsigned returnCount() const
{
return WTF::switchOn(m_storage,
[](const RTT* signature) -> unsigned {
return signature->returnCount();
},
[](Type type) -> unsigned {
return type.isVoid() ? 0 : 1;
}
);
}
Type argumentType(unsigned index) const
{
return WTF::switchOn(m_storage,
[&](const RTT* signature) -> Type {
ASSERT(index < signature->argumentCount());
return signature->argumentType(index);
},
[](Type) -> Type {
RELEASE_ASSERT_NOT_REACHED();
return Types::Void;
}
);
}
Type returnType(unsigned index) const
{
return WTF::switchOn(m_storage,
[&](const RTT* signature) -> Type {
ASSERT(index < signature->returnCount());
return signature->returnType(index);
},
[](Type type) -> Type {
ASSERT(!type.isVoid());
return type;
}
);
}
bool hasReturnedV128() const
{
return WTF::switchOn(m_storage,
[](const RTT* signature) -> bool {
return signature->hasReturnedV128();
},
[](Type type) -> bool {
return type.isV128();
}
);
}
bool holdsRTT() const { return std::holds_alternative<const RTT*>(m_storage); }
const RTT& rtt() const
{
ASSERT(holdsRTT());
return *std::get<const RTT*>(m_storage);
}
void dump(PrintStream& out) const;
private:
WTF::Variant<const RTT*, Type> m_storage;
};
enum class TableElementType : uint8_t {
Externref,
Funcref
};
constexpr int32_t maxI31ref = 1073741823;
constexpr int32_t minI31ref = -1073741824;
inline bool isValueType(Type type)
{
switch (type.kind()) {
case TypeKind::I32:
case TypeKind::I64:
case TypeKind::F32:
case TypeKind::F64:
return true;
case TypeKind::Exnref:
case TypeKind::Externref:
case TypeKind::Funcref:
return false;
case TypeKind::Ref:
case TypeKind::RefNull:
return type.index() != invalidTypeIndex;
case TypeKind::V128:
return Options::useWasmSIMD();
default:
break;
}
return false;
}
// Type hierarchy of Ref types is here
//
// any -> eq -> i31 ----+
// | |
// +--> array ----+-> none
// | |
// +--> struct ----+
//
// func -> nofunc
//
// extern -> noextern
//
// exn -> noexn
//
inline bool isRefType(Type type)
{
return type.isRef() || type.isRefNull();
}
// If this is a type, returns true iff it's a ref type; if it's a packed type, returns false
inline bool isRefType(StorageType type)
{
if (type.is<Type>())
return isRefType(type.as<Type>());
return false;
}
inline bool isExternref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Externref);
}
inline bool isFuncref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Funcref);
}
inline bool isEqref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Eqref);
}
inline bool isAnyref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Anyref);
}
inline bool isNoexnref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Noexnref);
}
inline bool isNoneref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Noneref);
}
inline bool isNofuncref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Nofuncref);
}
inline bool isNoexternref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Noexternref);
}
inline bool isInternalref(Type type)
{
if (!isRefType(type))
return false;
if (isAbstractTypeIndex(type.index())) {
switch (typeIndexAsTypeKind(type.index())) {
case TypeKind::I31ref:
case TypeKind::Arrayref:
case TypeKind::Structref:
case TypeKind::Eqref:
case TypeKind::Anyref:
case TypeKind::Noneref:
return true;
default:
return false;
}
}
return TypeInformation::getCanonicalRTT(type.index())->kind() != RTTKind::Function;
}
inline bool isI31ref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::I31ref);
}
inline bool isArrayref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Arrayref);
}
inline bool isStructref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Structref);
}
inline bool isExnref(Type type)
{
return isRefType(type) && type.index() == typeIndexFromTypeKind(TypeKind::Exnref);
}
// Placing a field in WasmGC Struct, but tracking a gap happening due to alignment requirement.
// We keep one gap slot so far if exists, and attempt to reuse this gap when it is possible.
inline unsigned placeStructField(size_t fieldSize, unsigned& currentOffset, unsigned& gapPosition, unsigned& gapSize)
{
if (fieldSize <= gapSize) {
unsigned alignedGap = WTF::roundUpToMultipleOf(fieldSize, gapPosition);
unsigned gapBefore = alignedGap - gapPosition;
unsigned alignedGapSize = gapSize - gapBefore;
if (fieldSize <= alignedGapSize) {
unsigned gapAfter = alignedGapSize - fieldSize;
if (gapBefore > gapAfter)
gapSize = gapBefore;
else {
gapPosition = alignedGap + fieldSize;
gapSize = gapAfter;
}
return alignedGap;
}
}
unsigned oldOffset = currentOffset;
currentOffset = WTF::roundUpToMultipleOf(fieldSize, currentOffset);
unsigned gap = currentOffset - oldOffset;
if (gap > gapSize) {
gapSize = gap;
gapPosition = oldOffset;
}
unsigned offset = currentOffset;
currentOffset += fieldSize;
return offset;
}
inline JSString* typeToJSAPIString(VM& vm, Type type)
{
switch (type.kind()) {
case TypeKind::I32:
return jsNontrivialString(vm, "i32"_s);
case TypeKind::I64:
return jsNontrivialString(vm, "i64"_s);
case TypeKind::F32:
return jsNontrivialString(vm, "f32"_s);
case TypeKind::F64:
return jsNontrivialString(vm, "f64"_s);
case TypeKind::V128:
return jsNontrivialString(vm, "v128"_s);
default: {
if (isFuncref(type) && type.isNullable())
return jsNontrivialString(vm, "funcref"_s);
if (isExternref(type) && type.isNullable())
return jsNontrivialString(vm, "externref"_s);
// Some Wasm reference types are currently unrepresentable for the JS API.
return nullptr;
}
}
RELEASE_ASSERT_NOT_REACHED();
}
inline Type nonNullFuncrefType()
{
return Wasm::Type { Wasm::TypeKind::Ref, typeIndexFromTypeKind(Wasm::TypeKind::Funcref) };
}
inline Type funcrefType()
{
return Wasm::Type { Wasm::TypeKind::RefNull, typeIndexFromTypeKind(Wasm::TypeKind::Funcref) };
}
inline Type externrefType(bool isNullable = true)
{
return Wasm::Type { isNullable ? Wasm::TypeKind::RefNull : Wasm::TypeKind::Ref, typeIndexFromTypeKind(Wasm::TypeKind::Externref) };
}
inline Type eqrefType()
{
return Wasm::Type { Wasm::TypeKind::RefNull, typeIndexFromTypeKind(Wasm::TypeKind::Eqref) };
}
inline Type anyrefType(bool isNullable = true)
{
return Wasm::Type { isNullable ? Wasm::TypeKind::RefNull : Wasm::TypeKind::Ref, typeIndexFromTypeKind(Wasm::TypeKind::Anyref) };
}
inline Type arrayrefType(bool isNullable = true)
{
// Returns a non-null ref type, since this is used for the return types of array operations
// that are guaranteed to return a non-null array reference
return Wasm::Type { isNullable ? Wasm::TypeKind::RefNull : Wasm::TypeKind::Ref, typeIndexFromTypeKind(Wasm::TypeKind::Arrayref) };
}
inline Type exnrefType()
{
return Wasm::Type { Wasm::TypeKind::RefNull, typeIndexFromTypeKind(Wasm::TypeKind::Exnref) };
}
inline bool isRefWithTypeIndex(Type type)
{
return isRefType(type) && !isAbstractTypeIndex(type.index());
}
inline bool isTypeIndexHeapType(int32_t heapType)
{
return heapType >= 0;
}
inline bool isSubtypeIndex(TypeIndex sub, TypeIndex parent)
{
if (sub == parent)
return true;
auto subRTT = TypeInformation::getCanonicalRTT(sub);
auto parentRTT = TypeInformation::getCanonicalRTT(parent);
return subRTT->isStrictSubRTT(parentRTT.get());
}
bool isSubtype(Type, Type);
inline bool isSubtypeSlow(Type sub, Type parent)
{
// Before the typed funcref proposal there is no non-trivial subtyping.
if (sub.isNullable() && !parent.isNullable())
return false;
if (isRefWithTypeIndex(sub)) {
if (isRefWithTypeIndex(parent))
return isSubtypeIndex(sub.index(), parent.index());
Ref<const RTT> subRTT = TypeInformation::getCanonicalRTT(sub.index());
if ((isAnyref(parent) || isEqref(parent)))
return subRTT->kind() != RTTKind::Function;
if (isArrayref(parent))
return subRTT->kind() == RTTKind::Array;
if (isStructref(parent))
return subRTT->kind() == RTTKind::Struct;
if (isFuncref(parent))
return subRTT->kind() == RTTKind::Function;
}
if ((isI31ref(sub) || isStructref(sub) || isArrayref(sub)) && (isAnyref(parent) || isEqref(parent)))
return true;
if (isEqref(sub) && isAnyref(parent))
return true;
if (isNoneref(sub))
return isInternalref(parent);
if (isNofuncref(sub))
return isSubtype(parent, funcrefType());
if (isNoexternref(sub) && isExternref(parent))
return true;
if (isNoexnref(sub) && isExnref(parent))
return true;
if (sub.isRef() && parent.isRefNull())
return sub.index() == parent.index();
return false;
}
ALWAYS_INLINE bool isSubtype(Type sub, Type parent)
{
// Fast path.
if (sub == parent)
return true;
return isSubtypeSlow(sub, parent);
}
inline bool isSubtype(StorageType sub, StorageType parent)
{
if (sub.is<PackedType>() || parent.is<PackedType>())
return sub == parent;
ASSERT(sub.is<Type>() && parent.is<Type>());
return isSubtype(sub.as<Type>(), parent.as<Type>());
}
inline bool isValidHeapTypeKind(intptr_t kind)
{
switch (kind) {
case static_cast<intptr_t>(TypeKind::Funcref):
case static_cast<intptr_t>(TypeKind::Externref):
case static_cast<intptr_t>(TypeKind::Exnref):
case static_cast<intptr_t>(TypeKind::I31ref):
case static_cast<intptr_t>(TypeKind::Arrayref):
case static_cast<intptr_t>(TypeKind::Structref):
case static_cast<intptr_t>(TypeKind::Eqref):
case static_cast<intptr_t>(TypeKind::Anyref):
case static_cast<intptr_t>(TypeKind::Noexnref):
case static_cast<intptr_t>(TypeKind::Noneref):
case static_cast<intptr_t>(TypeKind::Nofuncref):
case static_cast<intptr_t>(TypeKind::Noexternref):
return true;
default:
break;
}
return false;
}
// FIXME: separating out heap types in wasm.json could be cleaner in the long term.
inline const char* heapTypeKindAsString(TypeKind kind)
{
ASSERT(isValidHeapTypeKind(static_cast<intptr_t>(kind)));
switch (kind) {
case TypeKind::Funcref:
return "func";
case TypeKind::Externref:
return "extern";
case TypeKind::I31ref:
return "i31";
case TypeKind::Arrayref:
return "array";
case TypeKind::Structref:
return "struct";
case TypeKind::Eqref:
return "eq";
case TypeKind::Anyref:
return "any";
case TypeKind::Noneref:
return "none";
case TypeKind::Nofuncref:
return "nofunc";
case TypeKind::Noexternref:
return "noextern";
case TypeKind::Exnref:
return "exnref";
case TypeKind::Noexnref:
return "noexnref";
default:
RELEASE_ASSERT_NOT_REACHED();
return "";
}
}
inline bool isDefaultableType(Type type)
{
return !type.isRef();
}
inline bool isDefaultableType(StorageType type)
{
if (type.is<Type>())
return !type.as<Type>().isRef();
// All packed types are defaultable.
return true;
}
inline size_t sizeOfType(TypeKind kind)
{
switch (kind) {
case Wasm::TypeKind::I32:
case Wasm::TypeKind::F32:
return sizeof(uint32_t);
case Wasm::TypeKind::I64:
case Wasm::TypeKind::F64:
case Wasm::TypeKind::Ref:
case Wasm::TypeKind::RefNull:
return sizeof(uint64_t);
case Wasm::TypeKind::V128:
return sizeof(v128_t);
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
inline JSValue internalizeExternref(JSValue value)
{
if (value.isDouble()) {
if (auto int32Value = tryConvertToStrictInt32(value.asDouble())) {
if (int32Value.value() <= Wasm::maxI31ref && int32Value.value() >= Wasm::minI31ref)
return jsNumber(int32Value.value());
}
}
return value;
}
enum class ExternalKind : uint8_t {
// FIXME auto-generate this. https://bugs.webkit.org/show_bug.cgi?id=165231
Function = 0,
Table = 1,
Memory = 2,
Global = 3,
Exception = 4,
};
template<typename Int>
inline bool isValidExternalKind(Int val)
{
switch (val) {
case static_cast<Int>(ExternalKind::Function):
case static_cast<Int>(ExternalKind::Table):
case static_cast<Int>(ExternalKind::Memory):
case static_cast<Int>(ExternalKind::Global):
case static_cast<Int>(ExternalKind::Exception):
return true;
}
return false;
}
static_assert(static_cast<int>(ExternalKind::Function) == 0, "Wasm needs Function to have the value 0");
static_assert(static_cast<int>(ExternalKind::Table) == 1, "Wasm needs Table to have the value 1");
static_assert(static_cast<int>(ExternalKind::Memory) == 2, "Wasm needs Memory to have the value 2");
static_assert(static_cast<int>(ExternalKind::Global) == 3, "Wasm needs Global to have the value 3");
static_assert(static_cast<int>(ExternalKind::Exception) == 4, "Wasm needs Exception to have the value 4");
inline ASCIILiteral makeString(ExternalKind kind)
{
switch (kind) {
case ExternalKind::Function: return "function"_s;
case ExternalKind::Table: return "table"_s;
case ExternalKind::Memory: return "memory"_s;
case ExternalKind::Global: return "global"_s;
case ExternalKind::Exception: return "tag"_s;
}
RELEASE_ASSERT_NOT_REACHED();
return "?"_s;
}
struct Import {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(Import);
const Name module;
const Name field;
ExternalKind kind;
unsigned kindIndex; // Index in the vector of the corresponding kind.
};
struct Export {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(Export);
const Name field;
ExternalKind kind;
unsigned kindIndex; // Index in the vector of the corresponding kind.
};
String makeString(const Name& characters);
struct GlobalInformation {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(GlobalInformation);
enum InitializationType : uint8_t {
IsImport,
FromGlobalImport,
FromRefFunc,
FromExpression,
FromVector,
FromExtendedExpression,
};
enum class BindingMode : uint8_t {
EmbeddedInInstance = 0,
Portable,
};
Mutability mutability;
Type type;
InitializationType initializationType { IsImport };
BindingMode bindingMode { BindingMode::EmbeddedInInstance };
union {
uint64_t initialBitsOrImportNumber;
v128_t initialVector { };
} initialBits;
};
struct FunctionData {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(FunctionData);
size_t start;
size_t end;
Vector<uint8_t> data;
bool usesSIMD : 1 { false };
bool usesExceptions : 1 { false };
bool usesAtomics : 1 { false };
bool finishedValidating : 1 { false };
};
class I32InitExpr {
WTF_MAKE_TZONE_ALLOCATED(I32InitExpr);
enum Type : uint8_t {
Global,
Const,
ExtendedExpression
};
I32InitExpr(Type type, uint64_t bits)
: m_bits(bits)
, m_type(type)
{ }
public:
I32InitExpr() = delete;
static I32InitExpr globalImport(uint64_t globalImportNumber) { return I32InitExpr(Global, globalImportNumber); }
static I32InitExpr constValue(uint64_t constValue) { return I32InitExpr(Const, constValue); }
static I32InitExpr extendedExpression(uint64_t constantExpressionNumber) { return I32InitExpr(ExtendedExpression, constantExpressionNumber); }
bool isConst() const { return m_type == Const; }
bool isGlobalImport() const { return m_type == Global; }
bool isExtendedExpression() const { return m_type == ExtendedExpression; }
uint64_t constValue() const
{
RELEASE_ASSERT(isConst());
return m_bits;
}
uint64_t globalImportIndex() const
{
RELEASE_ASSERT(isGlobalImport());
return m_bits;
}
uint64_t constantExpressionIndex() const
{
RELEASE_ASSERT(isExtendedExpression());
return m_bits;
}
private:
uint64_t m_bits;
Type m_type;
};
using I64InitExpr = I32InitExpr;
class Segment final : public TrailingArray<Segment, uint8_t> {
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(Segment);
WTF_MAKE_NONCOPYABLE(Segment);
WTF_MAKE_NONMOVABLE(Segment);
using Base = TrailingArray<Segment, uint8_t>;
friend Base;
public:
enum class Kind : uint8_t {
Active,
Passive,
};
uint8_t& byte(uint32_t pos)
{
return Base::at(pos);
}
uint32_t sizeInBytes() const { return Base::size(); }
Segment(size_t sizeInBytes, Kind passedKind, std::optional<I32InitExpr>&& passedOffsetIfActive, uint32_t memoryIndex = 0)
: Base(sizeInBytes)
, m_kind(passedKind)
, m_offsetIfActive(WTF::move(passedOffsetIfActive))
, m_memoryIndex(memoryIndex)
{
}
static std::unique_ptr<Segment> tryCreate(std::optional<I32InitExpr>, uint32_t, Kind, uint32_t memoryIndex = 0);
bool isActive() const { return m_kind == Kind::Active; }
bool isPassive() const { return m_kind == Kind::Passive; }
Kind kind() const { return m_kind; }
std::optional<I32InitExpr> offsetIfActive() const { return m_offsetIfActive; }
uint32_t memoryIndex() const { return m_memoryIndex; }
private:
const Kind m_kind;
const std::optional<I32InitExpr> m_offsetIfActive;
const uint32_t m_memoryIndex;
};
struct Element {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(Element);
enum class Kind : uint8_t {
Active,
Passive,
Declared,
};
enum InitializationType : uint8_t {
FromGlobal,
FromRefFunc,
FromRefNull,
FromExtendedExpression,
};
Element(Element::Kind kind, Type elementType, std::optional<uint32_t> tableIndex, std::optional<I32InitExpr> initExpr)
: kind(kind)
, elementType(elementType)
, tableIndexIfActive(WTF::move(tableIndex))
, offsetIfActive(WTF::move(initExpr))
{ }
Element(Element::Kind kind, Type elemType)
: Element(kind, elemType, std::nullopt, std::nullopt)
{ }
uint32_t length() const { return initTypes.size(); }
bool isActive() const { return kind == Kind::Active; }
bool isPassive() const { return kind == Kind::Passive; }
Kind kind;
Type elementType;
std::optional<uint32_t> tableIndexIfActive;
std::optional<I32InitExpr> offsetIfActive;
Vector<InitializationType> initTypes;
Vector<uint64_t> initialBitsOrIndices;
};
class TableInformation {
WTF_MAKE_TZONE_ALLOCATED(TableInformation);
public:
enum InitializationType : uint8_t {
Default,
FromGlobalImport,
FromRefFunc,
FromRefNull,
FromExtendedExpression,
};
TableInformation()
{
ASSERT(!*this);
}
TableInformation(uint64_t initial, std::optional<uint64_t> maximum, bool isImport, TableElementType type, Type wasmType, InitializationType initType, uint64_t initialBitsOrImportNumber, bool isTable64)
: m_wasmType(wasmType)
, m_maximum(maximum)
, m_initialBitsOrImportNumber(initialBitsOrImportNumber)
, m_initial(initial)
, m_type(type)
, m_addressType(isTable64)
, m_initType(initType)
, m_isImport(isImport)
, m_isValid(true)
{
ASSERT(*this);
}
explicit operator bool() const { return m_isValid; }
bool isImport() const { return m_isImport; }
// The size the module declared, which may be larger than any table this implementation can
// create. It is checked when the table is created, not when the declaration is parsed.
uint64_t initial() const { return m_initial; }
std::optional<uint64_t> maximum() const { return m_maximum; }
TableElementType type() const { return m_type; }
Type wasmType() const { return m_wasmType; }
InitializationType initType() const { return m_initType; }
uint64_t initialBitsOrImportNumber() const { return m_initialBitsOrImportNumber; }
Wasm::AddressType addressType() const { return m_addressType; }
private:
Type m_wasmType;
std::optional<uint64_t> m_maximum;
uint64_t m_initialBitsOrImportNumber;
uint64_t m_initial;
TableElementType m_type;
Wasm::AddressType m_addressType;
InitializationType m_initType { Default };
bool m_isImport { false };
bool m_isValid { false };
};
struct CustomSection {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(CustomSection);
Name name;
Vector<uint8_t> payload;
};
enum class NameType : uint8_t {
Module = 0,
Function = 1,
Local = 2,
};
template<typename Int>
inline bool isValidNameType(Int val)
{
switch (val) {
case static_cast<Int>(NameType::Module):
case static_cast<Int>(NameType::Function):
case static_cast<Int>(NameType::Local):
return true;
}
return false;
}
// A code index is an index in the code section of the module, thus does not include imports. This is also sometimes called an internal function.
// A space index is an index into the total function space of a module and includes imports. It's broken down into [ imports..., code section... ].
// These are **NOT** convertable without knowing how many imports there are e.g. via ModuleInformation/CalleeGroup's toCodeIndex/toSpaceIndex
class FunctionSpaceIndex;
class TRIVIAL_ABI FunctionCodeIndex {
public:
FunctionCodeIndex() = default;
FunctionCodeIndex(FunctionSpaceIndex) = delete;
explicit constexpr FunctionCodeIndex(uint32_t index)
: m_index(index)
{ }
size_t rawIndex() const { return m_index; }
operator size_t() const { return m_index; }
void dump(PrintStream& out) const { out.print(m_index); }
private:
uint32_t m_index { UINT_MAX };
};
class TRIVIAL_ABI FunctionSpaceIndex {
public:
FunctionSpaceIndex() = default;
FunctionSpaceIndex(FunctionCodeIndex) = delete;
explicit constexpr FunctionSpaceIndex(uint32_t index)
: m_index(index)
{ }
size_t rawIndex() const { return m_index; }
operator size_t() const { return m_index; }
void dump(PrintStream& out) const { out.print(m_index); }
private:
uint32_t m_index { UINT_MAX };
};
// An index into the type section of a module (typeSignatures / expandedTypeSignatures vectors).
// NOT interchangeable with TypeIndex, which is a global canonical identity.
class TRIVIAL_ABI TypeSignatureIndex {
public:
TypeSignatureIndex() = default;
explicit constexpr TypeSignatureIndex(uint32_t index)
: m_index(index)
{ }
uint32_t rawIndex() const { return m_index; }
void dump(PrintStream& out) const { out.print(m_index); }
private:
uint32_t m_index { UINT_MAX };
};
struct UnlinkedWasmToWasmCall {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(UnlinkedWasmToWasmCall);
CodeLocationNearCall<WasmEntryPtrTag> callLocation;
FunctionSpaceIndex functionIndexSpace;
};
#if ENABLE(JIT)
struct Entrypoint {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(Entrypoint);
std::unique_ptr<Compilation> compilation;
RegisterAtOffsetList calleeSaveRegisters;
};
#endif
class OSREntryValue;
using StackMap = FixedVector<OSREntryValue>;
using StackMaps = UncheckedKeyHashMap<CallSiteIndex, StackMap>;
struct InternalFunction {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(InternalFunction);
#if ENABLE(WEBASSEMBLY_OMGJIT) || ENABLE(WEBASSEMBLY_BBQJIT)
StackMaps stackmaps;
#endif
Vector<UnlinkedHandlerInfo> exceptionHandlers;
#if ENABLE(JIT)
Vector<CCallHelpers::Label> bbqLoopEntrypoints;
std::optional<CCallHelpers::Label> bbqSharedLoopEntrypoint;
Entrypoint entrypoint;
FixedBitVector outgoingJITDirectCallees;
#endif
unsigned osrEntryScratchBufferSize { 0 };
};
struct alignas(8) WasmCallableFunction {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(WasmCallableFunction);
using LoadLocation = CodePtr<WasmEntryPtrTag>*;
static constexpr ptrdiff_t offsetOfBoxedCallee() { return OBJECT_OFFSETOF(WasmCallableFunction, boxedCallee); }
static constexpr ptrdiff_t offsetOfTargetInstance() { return OBJECT_OFFSETOF(WasmCallableFunction, targetInstance); }
static constexpr ptrdiff_t offsetOfEntrypointLoadLocation() { return OBJECT_OFFSETOF(WasmCallableFunction, entrypointLoadLocation); }
// LoadLocation's dereference.
static constexpr ptrdiff_t offsetOfValueOfLoadLocation() { return 0; }
bool isJS() const;
CalleeBits boxedCallee { };
// Target instance and entrypoint are only set for wasm->wasm calls, and are otherwise nullptr. The js-specific logic occurs through import function.
WriteBarrier<JSWebAssemblyInstance> targetInstance { };
LoadLocation entrypointLoadLocation { };
};
// WebAssembly direct calls and call_indirect use indices into "function index space". This space starts
// with all imports, and then all internal functions. WasmToWasmImportableFunction and FunctionIndexSpace are only
// meant as fast lookup tables for these opcodes and do not own code.
struct WasmToWasmImportableFunction : public WasmCallableFunction {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(WasmToWasmImportableFunction);