JSWebAssemblyCodeBlock.h [plain text]
#pragma once
#if ENABLE(WEBASSEMBLY)
#include "CallLinkInfo.h"
#include "JSCell.h"
#include "PromiseDeferredTimer.h"
#include "Structure.h"
#include "UnconditionalFinalizer.h"
#include "WasmCallee.h"
#include "WasmFormat.h"
#include "WasmModule.h"
#include <wtf/Bag.h>
#include <wtf/Vector.h>
namespace JSC {
class JSWebAssemblyModule;
class JSWebAssemblyMemory;
namespace Wasm {
class Plan;
}
class JSWebAssemblyCodeBlock final : public JSCell {
public:
typedef JSCell Base;
static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
static JSWebAssemblyCodeBlock* create(VM&, Ref<Wasm::CodeBlock>, JSWebAssemblyModule*);
static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(CellType, StructureFlags), info());
}
template<typename CellType>
static Subspace* subspaceFor(VM& vm)
{
return &vm.webAssemblyCodeBlockSpace;
}
unsigned functionImportCount() const { return m_codeBlock->functionImportCount(); }
JSWebAssemblyModule* module() const { return m_module.get(); }
bool isSafeToRun(JSWebAssemblyMemory*) const;
void finishCreation(VM&, JSWebAssemblyModule*);
Wasm::Callee& jsEntrypointCalleeFromFunctionIndexSpace(unsigned functionIndexSpace)
{
ASSERT(runnable());
return m_codeBlock->jsEntrypointCalleeFromFunctionIndexSpace(functionIndexSpace);
}
Wasm::WasmEntrypointLoadLocation wasmEntrypointLoadLocationFromFunctionIndexSpace(unsigned functionIndexSpace)
{
ASSERT(runnable());
return m_codeBlock->wasmEntrypointLoadLocationFromFunctionIndexSpace(functionIndexSpace);
}
Wasm::WasmEntrypointLoadLocation wasmToJsCallStubForImport(unsigned importIndex)
{
ASSERT(runnable());
return &importWasmToJSStub(importIndex);
}
static ptrdiff_t offsetOfImportWasmToJSStub(unsigned importIndex)
{
return offsetOfImportStubs() + sizeof(void*) * importIndex;
}
Wasm::CodeBlock& codeBlock() { return m_codeBlock.get(); }
void clearJSCallICs(VM&);
bool runnable() const { return !m_errorMessage; }
String errorMessage()
{
ASSERT(!runnable());
return m_errorMessage;
}
private:
JSWebAssemblyCodeBlock(VM&, Ref<Wasm::CodeBlock>&&, const Wasm::ModuleInformation&);
DECLARE_EXPORT_INFO;
static const bool needsDestruction = true;
static void destroy(JSCell*);
static void visitChildren(JSCell*, SlotVisitor&);
static size_t offsetOfImportStubs()
{
return WTF::roundUpToMultipleOf<sizeof(void*)>(sizeof(JSWebAssemblyCodeBlock));
}
static size_t allocationSize(Checked<size_t> functionImportCount)
{
return (offsetOfImportStubs() + sizeof(void*) * functionImportCount).unsafeGet();
}
void*& importWasmToJSStub(unsigned importIndex)
{
return *bitwise_cast<void**>(bitwise_cast<char*>(this) + offsetOfImportWasmToJSStub(importIndex));
}
class UnconditionalFinalizer : public JSC::UnconditionalFinalizer {
void finalizeUnconditionally() override;
};
Ref<Wasm::CodeBlock> m_codeBlock;
WriteBarrier<JSWebAssemblyModule> m_module;
Vector<MacroAssemblerCodeRef> m_wasmToJSExitStubs;
UnconditionalFinalizer m_unconditionalFinalizer;
Bag<CallLinkInfo> m_callLinkInfos;
String m_errorMessage;
};
}
#endif // ENABLE(WEBASSEMBLY)