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/*
* Copyright (C) 2017 Apple Inc. 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
#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*);
// These two callee getters are only valid once the callees have been populated.
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;
};
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY)
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