| /* |
| * Copyright (C) 2016-2018 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 "AllowMacroScratchRegisterUsage.h" |
| #include "B3ArgumentRegValue.h" |
| #include "B3BasicBlock.h" |
| #include "B3Const64Value.h" |
| #include "B3ConstrainedValue.h" |
| #include "B3MemoryValue.h" |
| #include "B3PatchpointValue.h" |
| #include "B3Procedure.h" |
| #include "B3StackmapGenerationParams.h" |
| #include "CallFrame.h" |
| #include "LinkBuffer.h" |
| #include "RegisterSet.h" |
| #include "WasmFormat.h" |
| #include "WasmSignature.h" |
| |
| namespace JSC { namespace Wasm { |
| |
| typedef unsigned (*NextOffset)(unsigned currentOffset, B3::Type type); |
| |
| template<unsigned headerSize, NextOffset updateOffset> |
| class CallingConvention { |
| public: |
| CallingConvention(Vector<Reg>&& gprArgs, Vector<Reg>&& fprArgs, RegisterSet&& calleeSaveRegisters) |
| : m_gprArgs(gprArgs) |
| , m_fprArgs(fprArgs) |
| , m_calleeSaveRegisters(calleeSaveRegisters) |
| { |
| } |
| |
| private: |
| B3::ValueRep marshallArgumentImpl(Vector<Reg> regArgs, B3::Type type, size_t& count, size_t& stackOffset) const |
| { |
| if (count < regArgs.size()) |
| return B3::ValueRep::reg(regArgs[count++]); |
| |
| count++; |
| B3::ValueRep result = B3::ValueRep::stackArgument(stackOffset); |
| stackOffset = updateOffset(stackOffset, type); |
| return result; |
| } |
| |
| B3::ValueRep marshallArgument(B3::Type type, size_t& gpArgumentCount, size_t& fpArgumentCount, size_t& stackOffset) const |
| { |
| switch (type) { |
| case B3::Int32: |
| case B3::Int64: |
| return marshallArgumentImpl(m_gprArgs, type, gpArgumentCount, stackOffset); |
| case B3::Float: |
| case B3::Double: |
| return marshallArgumentImpl(m_fprArgs, type, fpArgumentCount, stackOffset); |
| case B3::Void: |
| break; |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| |
| public: |
| static unsigned headerSizeInBytes() { return headerSize; } |
| void setupFrameInPrologue(CodeLocationDataLabelPtr<WasmEntryPtrTag>* calleeMoveLocation, B3::Procedure& proc, B3::Origin origin, B3::BasicBlock* block) const |
| { |
| static_assert(CallFrameSlot::callee * sizeof(Register) < headerSize, "We rely on this here for now."); |
| static_assert(CallFrameSlot::codeBlock * sizeof(Register) < headerSize, "We rely on this here for now."); |
| |
| B3::PatchpointValue* getCalleePatchpoint = block->appendNew<B3::PatchpointValue>(proc, B3::Int64, origin); |
| getCalleePatchpoint->resultConstraint = B3::ValueRep::SomeRegister; |
| getCalleePatchpoint->effects = B3::Effects::none(); |
| getCalleePatchpoint->setGenerator( |
| [=] (CCallHelpers& jit, const B3::StackmapGenerationParams& params) { |
| GPRReg result = params[0].gpr(); |
| MacroAssembler::DataLabelPtr moveLocation = jit.moveWithPatch(MacroAssembler::TrustedImmPtr(nullptr), result); |
| jit.addLinkTask([calleeMoveLocation, moveLocation] (LinkBuffer& linkBuffer) { |
| *calleeMoveLocation = linkBuffer.locationOf<WasmEntryPtrTag>(moveLocation); |
| }); |
| }); |
| |
| B3::Value* framePointer = block->appendNew<B3::Value>(proc, B3::FramePointer, origin); |
| B3::Value* offsetOfCallee = block->appendNew<B3::Const64Value>(proc, origin, CallFrameSlot::callee * sizeof(Register)); |
| block->appendNew<B3::MemoryValue>(proc, B3::Store, origin, |
| getCalleePatchpoint, |
| block->appendNew<B3::Value>(proc, B3::Add, origin, framePointer, offsetOfCallee)); |
| |
| // FIXME: We shouldn't have to store zero into the CodeBlock* spot in the call frame, |
| // but there are places that interpret non-null CodeBlock slot to mean a valid CodeBlock. |
| // When doing unwinding, we'll need to verify that the entire runtime is OK with a non-null |
| // CodeBlock not implying that the CodeBlock is valid. |
| // https://bugs.webkit.org/show_bug.cgi?id=165321 |
| B3::Value* offsetOfCodeBlock = block->appendNew<B3::Const64Value>(proc, origin, CallFrameSlot::codeBlock * sizeof(Register)); |
| block->appendNew<B3::MemoryValue>(proc, B3::Store, origin, |
| block->appendNew<B3::Const64Value>(proc, origin, 0), |
| block->appendNew<B3::Value>(proc, B3::Add, origin, framePointer, offsetOfCodeBlock)); |
| } |
| |
| template<typename Functor> |
| void loadArguments(const Signature& signature, B3::Procedure& proc, B3::BasicBlock* block, B3::Origin origin, const Functor& functor) const |
| { |
| B3::Value* framePointer = block->appendNew<B3::Value>(proc, B3::FramePointer, origin); |
| |
| size_t gpArgumentCount = 0; |
| size_t fpArgumentCount = 0; |
| size_t stackOffset = headerSize; |
| |
| for (size_t i = 0; i < signature.argumentCount(); ++i) { |
| B3::Type type = toB3Type(signature.argument(i)); |
| B3::Value* argument; |
| B3::ValueRep rep = marshallArgument(type, gpArgumentCount, fpArgumentCount, stackOffset); |
| if (rep.isReg()) { |
| argument = block->appendNew<B3::ArgumentRegValue>(proc, origin, rep.reg()); |
| if (type == B3::Int32 || type == B3::Float) |
| argument = block->appendNew<B3::Value>(proc, B3::Trunc, origin, argument); |
| } else { |
| ASSERT(rep.isStackArgument()); |
| B3::Value* address = block->appendNew<B3::Value>(proc, B3::Add, origin, framePointer, |
| block->appendNew<B3::Const64Value>(proc, origin, rep.offsetFromSP())); |
| argument = block->appendNew<B3::MemoryValue>(proc, B3::Load, type, origin, address); |
| } |
| functor(argument, i); |
| } |
| } |
| |
| // It's expected that the pachpointFunctor sets the generator for the call operation. |
| template<typename Functor> |
| B3::Value* setupCall(B3::Procedure& proc, B3::BasicBlock* block, B3::Origin origin, const Vector<B3::Value*>& arguments, B3::Type returnType, const Functor& patchpointFunctor) const |
| { |
| size_t gpArgumentCount = 0; |
| size_t fpArgumentCount = 0; |
| size_t stackOffset = headerSize - sizeof(CallerFrameAndPC); |
| |
| Vector<B3::ConstrainedValue> constrainedArguments; |
| for (B3::Value* argument : arguments) { |
| B3::ValueRep rep = marshallArgument(argument->type(), gpArgumentCount, fpArgumentCount, stackOffset); |
| constrainedArguments.append(B3::ConstrainedValue(argument, rep)); |
| } |
| |
| proc.requestCallArgAreaSizeInBytes(WTF::roundUpToMultipleOf(stackAlignmentBytes(), stackOffset)); |
| |
| B3::PatchpointValue* patchpoint = block->appendNew<B3::PatchpointValue>(proc, returnType, origin); |
| patchpoint->clobberEarly(RegisterSet::macroScratchRegisters()); |
| patchpoint->clobberLate(RegisterSet::volatileRegistersForJSCall()); |
| patchpointFunctor(patchpoint); |
| patchpoint->appendVector(constrainedArguments); |
| |
| switch (returnType) { |
| case B3::Void: |
| return nullptr; |
| case B3::Float: |
| case B3::Double: |
| patchpoint->resultConstraint = B3::ValueRep::reg(FPRInfo::returnValueFPR); |
| break; |
| case B3::Int32: |
| case B3::Int64: |
| patchpoint->resultConstraint = B3::ValueRep::reg(GPRInfo::returnValueGPR); |
| break; |
| } |
| return patchpoint; |
| } |
| |
| const Vector<Reg> m_gprArgs; |
| const Vector<Reg> m_fprArgs; |
| const RegisterSet m_calleeSaveRegisters; |
| const RegisterSet m_callerSaveRegisters; |
| }; |
| |
| inline unsigned nextJSCOffset(unsigned currentOffset, B3::Type) |
| { |
| return currentOffset + sizeof(Register); |
| } |
| |
| constexpr unsigned jscHeaderSize = ExecState::headerSizeInRegisters * sizeof(Register); |
| typedef CallingConvention<jscHeaderSize, nextJSCOffset> JSCCallingConvention; |
| |
| typedef JSCCallingConvention WasmCallingConvention; |
| |
| const JSCCallingConvention& jscCallingConvention(); |
| const WasmCallingConvention& wasmCallingConvention(); |
| |
| } } // namespace JSC::Wasm |
| |
| #endif // ENABLE(WEBASSEMBLY) |
