WasmFunctionCodeBlock.h [plain text]
#pragma once
#if ENABLE(WEBASSEMBLY)
#include "BytecodeConventions.h"
#include "InstructionStream.h"
#include "MacroAssemblerCodeRef.h"
#include "WasmLLIntTierUpCounter.h"
#include <wtf/HashMap.h>
#include <wtf/Vector.h>
namespace JSC {
class JITCode;
class LLIntOffsetsExtractor;
template<typename Traits>
class BytecodeGeneratorBase;
namespace Wasm {
class Signature;
struct GeneratorTraits;
enum Type : int8_t;
class FunctionCodeBlock {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(FunctionCodeBlock);
friend BytecodeGeneratorBase<GeneratorTraits>;
friend LLIntOffsetsExtractor;
friend class LLIntGenerator;
public:
FunctionCodeBlock(uint32_t functionIndex)
: m_functionIndex(functionIndex)
{
}
uint32_t functionIndex() const { return m_functionIndex; }
unsigned numVars() const { return m_numVars; }
unsigned numCalleeLocals() const { return m_numCalleeLocals; }
uint32_t numArguments() const { return m_numArguments; }
const Vector<Type>& constantTypes() const { return m_constantTypes; }
const Vector<uint64_t>& constants() const { return m_constants; }
const InstructionStream& instructions() const { return *m_instructions; }
void setNumVars(unsigned numVars) { m_numVars = numVars; }
void setNumCalleeLocals(unsigned numCalleeLocals) { m_numCalleeLocals = numCalleeLocals; }
ALWAYS_INLINE uint64_t getConstant(VirtualRegister reg) const { return m_constants[reg.toConstantIndex()]; }
ALWAYS_INLINE Type getConstantType(VirtualRegister reg) const
{
ASSERT(Options::dumpGeneratedWasmBytecodes());
return m_constantTypes[reg.toConstantIndex()];
}
void setInstructions(std::unique_ptr<InstructionStream>);
void addJumpTarget(InstructionStream::Offset jumpTarget) { m_jumpTargets.append(jumpTarget); }
InstructionStream::Offset numberOfJumpTargets() { return m_jumpTargets.size(); }
InstructionStream::Offset lastJumpTarget() { return m_jumpTargets.last(); }
void addOutOfLineJumpTarget(InstructionStream::Offset, int target);
const Instruction* outOfLineJumpTarget(const Instruction*);
InstructionStream::Offset outOfLineJumpOffset(InstructionStream::Offset);
InstructionStream::Offset outOfLineJumpOffset(const InstructionStream::Ref& instruction)
{
return outOfLineJumpOffset(instruction.offset());
}
inline InstructionStream::Offset bytecodeOffset(const Instruction* returnAddress)
{
const auto* instructionsBegin = m_instructions->at(0).ptr();
const auto* instructionsEnd = reinterpret_cast<const Instruction*>(reinterpret_cast<uintptr_t>(instructionsBegin) + m_instructions->size());
RELEASE_ASSERT(returnAddress >= instructionsBegin && returnAddress < instructionsEnd);
return returnAddress - instructionsBegin;
}
LLIntTierUpCounter& tierUpCounter() { return m_tierUpCounter; }
unsigned addSignature(const Signature&);
const Signature& signature(unsigned index) const;
struct JumpTableEntry {
int target { 0 };
unsigned startOffset;
unsigned dropCount;
unsigned keepCount;
};
using JumpTable = Vector<JumpTableEntry>;
JumpTable& addJumpTable(size_t numberOfEntries);
const JumpTable& jumpTable(unsigned tableIndex) const;
unsigned numberOfJumpTables() const;
private:
using OutOfLineJumpTargets = HashMap<InstructionStream::Offset, int>;
uint32_t m_functionIndex;
unsigned m_numVars { 0 };
unsigned m_numCalleeLocals { 0 };
uint32_t m_numArguments { 0 };
Vector<Type> m_constantTypes;
Vector<uint64_t> m_constants;
std::unique_ptr<InstructionStream> m_instructions;
const void* m_instructionsRawPointer { nullptr };
Vector<InstructionStream::Offset> m_jumpTargets;
Vector<const Signature*> m_signatures;
OutOfLineJumpTargets m_outOfLineJumpTargets;
LLIntTierUpCounter m_tierUpCounter;
Vector<JumpTable> m_jumpTables;
};
} }
#endif // ENABLE(WEBASSEMBLY)