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/*
* Copyright (C) 2022-2024 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_OMGJIT) || ENABLE(WEBASSEMBLY_BBQJIT)
#include "AirCode.h"
#include "B3StackmapGenerationParams.h"
#include "B3StackmapValue.h"
#include "CCallHelpers.h"
#include "JSWebAssemblyException.h"
#include "JSWebAssemblyInstance.h"
#include "LinkBuffer.h"
#include "ProbeContext.h"
#include "WasmOperations.h"
namespace JSC { namespace Wasm {
struct PatchpointExceptionHandleBase {
static constexpr unsigned s_invalidCallSiteIndex = std::numeric_limits<unsigned>::max();
};
#if ENABLE(WEBASSEMBLY_OMGJIT)
struct PatchpointExceptionHandle : public PatchpointExceptionHandleBase {
PatchpointExceptionHandle(std::optional<bool> hasExceptionHandlers, unsigned callSiteIndex)
: m_hasExceptionHandlers(hasExceptionHandlers)
, m_callSiteIndex(callSiteIndex)
{ }
PatchpointExceptionHandle(std::optional<bool> hasExceptionHandlers, unsigned callSiteIndex, unsigned numLiveValues, unsigned firstStackmapParamOffset, unsigned firstStackmapChildOffset)
: m_hasExceptionHandlers(hasExceptionHandlers)
, m_callSiteIndex(callSiteIndex)
, m_numLiveValues(numLiveValues)
, m_firstStackmapParamOffset(firstStackmapParamOffset)
, m_firstStackmapChildOffset(firstStackmapChildOffset)
{ }
template <typename Generator>
void generate(CCallHelpers& jit, const B3::StackmapGenerationParams& params, Generator* generator) const
{
JIT_COMMENT(jit, "Store call site index ", m_callSiteIndex, " at throw or call site.");
jit.store32(CCallHelpers::TrustedImm32(m_callSiteIndex), CCallHelpers::tagFor(CallFrameSlot::argumentCountIncludingThis));
if (m_hasExceptionHandlers && !*m_hasExceptionHandlers)
return;
if (!m_numLiveValues)
return;
StackMap values(*m_numLiveValues);
for (unsigned i = 0; i < *m_numLiveValues; ++i)
values[i] = OSREntryValue(params[i + m_firstStackmapParamOffset], params.value()->child(i + m_firstStackmapChildOffset)->type());
generator->addStackMap(m_callSiteIndex, WTFMove(values));
}
std::optional<bool> m_hasExceptionHandlers;
unsigned m_callSiteIndex { s_invalidCallSiteIndex };
std::optional<unsigned> m_numLiveValues { };
unsigned m_firstStackmapParamOffset { };
unsigned m_firstStackmapChildOffset { };
};
#else
using PatchpointExceptionHandle = PatchpointExceptionHandleBase;
#endif
static inline void computeExceptionHandlerAndLoopEntrypointLocations(Vector<CodeLocationLabel<ExceptionHandlerPtrTag>>& handlers, Vector<CodeLocationLabel<WasmEntryPtrTag>>& loopEntrypoints, const InternalFunction* function, const CompilationContext& context, LinkBuffer& linkBuffer)
{
if (!context.procedure) {
ASSERT(Options::useBBQJIT());
for (auto label : function->bbqLoopEntrypoints)
loopEntrypoints.append(linkBuffer.locationOf<WasmEntryPtrTag>(label));
unsigned index = 0;
for (const UnlinkedHandlerInfo& handlerInfo : function->exceptionHandlers) {
if (handlerInfo.m_type == HandlerType::Delegate) {
handlers.append({ });
continue;
}
handlers.append(linkBuffer.locationOf<ExceptionHandlerPtrTag>(context.catchEntrypoints[index++]));
}
return;
}
#if ENABLE(WEBASSEMBLY_OMGJIT)
unsigned entrypointIndex = 1;
unsigned numEntrypoints = context.procedure->numEntrypoints();
for (const UnlinkedHandlerInfo& handlerInfo : function->exceptionHandlers) {
if (handlerInfo.m_type == HandlerType::Delegate) {
handlers.append({ });
continue;
}
RELEASE_ASSERT(entrypointIndex < numEntrypoints);
handlers.append(linkBuffer.locationOf<ExceptionHandlerPtrTag>(context.procedure->code().entrypointLabel(entrypointIndex)));
++entrypointIndex;
}
for (; entrypointIndex < numEntrypoints; ++entrypointIndex)
loopEntrypoints.append(linkBuffer.locationOf<WasmEntryPtrTag>(context.procedure->code().entrypointLabel(entrypointIndex)));
#else
RELEASE_ASSERT_NOT_REACHED();
#endif
}
static inline void computeExceptionHandlerLocations(Vector<CodeLocationLabel<ExceptionHandlerPtrTag>>& handlers, const InternalFunction* function, const CompilationContext& context, LinkBuffer& linkBuffer)
{
Vector<CodeLocationLabel<WasmEntryPtrTag>> ignored;
computeExceptionHandlerAndLoopEntrypointLocations(handlers, ignored, function, context, linkBuffer);
}
static inline void emitThrowRefImpl(CCallHelpers& jit)
{
// JSWebAssemblyInstance in argumentGPR0
// exception pointer in argumentGPR1
GPRReg scratch = GPRInfo::nonPreservedNonArgumentGPR0;
jit.loadPtr(CCallHelpers::Address(GPRInfo::argumentGPR0, JSWebAssemblyInstance::offsetOfVM()), scratch);
jit.copyCalleeSavesToVMEntryFrameCalleeSavesBuffer(scratch);
jit.prepareWasmCallOperation(GPRInfo::argumentGPR0);
jit.callOperation<OperationPtrTag>(operationWasmRethrow);
jit.farJump(GPRInfo::returnValueGPR, ExceptionHandlerPtrTag);
}
static inline void emitThrowImpl(CCallHelpers& jit, unsigned exceptionIndex)
{
JIT_COMMENT(jit, "throw impl, index: ", exceptionIndex);
// JSWebAssemblyInstance in argumentGPR0
// arguments to the exception off of stack pointer
GPRReg scratch = GPRInfo::nonPreservedNonArgumentGPR0;
jit.loadPtr(CCallHelpers::Address(GPRInfo::argumentGPR0, JSWebAssemblyInstance::offsetOfVM()), scratch);
jit.copyCalleeSavesToVMEntryFrameCalleeSavesBuffer(scratch);
jit.move(MacroAssembler::TrustedImm32(exceptionIndex), GPRInfo::argumentGPR1);
jit.move(MacroAssembler::stackPointerRegister, GPRInfo::argumentGPR2);
jit.prepareWasmCallOperation(GPRInfo::argumentGPR0);
jit.callOperation<OperationPtrTag>(operationWasmThrow);
jit.farJump(GPRInfo::returnValueGPR, ExceptionHandlerPtrTag);
}
#if ENABLE(WEBASSEMBLY_OMGJIT)
template<SavedFPWidth savedFPWidth>
static ALWAYS_INLINE void buildEntryBufferForCatch(Probe::Context& context)
{
unsigned valueSize = (savedFPWidth == SavedFPWidth::SaveVectors) ? 2 : 1;
CallFrame* callFrame = context.fp<CallFrame*>();
CallSiteIndex callSiteIndex = callFrame->callSiteIndex();
OptimizingJITCallee* callee = std::bit_cast<OptimizingJITCallee*>(callFrame->callee().asNativeCallee());
const StackMap& stackmap = callee->stackmap(callSiteIndex);
JSWebAssemblyInstance* instance = context.gpr<JSWebAssemblyInstance*>(GPRInfo::wasmContextInstancePointer);
EncodedJSValue exception = context.gpr<EncodedJSValue>(GPRInfo::returnValueGPR);
uint64_t* buffer = instance->vm().wasmContext.scratchBufferForSize(stackmap.size() * valueSize * 8);
loadValuesIntoBuffer(context, stackmap, buffer, savedFPWidth);
JSValue thrownValue = JSValue::decode(exception);
void* payload = nullptr;
if (JSWebAssemblyException* wasmException = jsDynamicCast<JSWebAssemblyException*>(thrownValue))
payload = std::bit_cast<void*>(wasmException->payload().span().data());
context.gpr(GPRInfo::argumentGPR0) = std::bit_cast<uintptr_t>(buffer);
context.gpr(GPRInfo::argumentGPR1) = exception;
context.gpr(GPRInfo::argumentGPR2) = std::bit_cast<uintptr_t>(payload);
}
static inline void SYSV_ABI buildEntryBufferForCatchSIMD(Probe::Context& context) { buildEntryBufferForCatch<SavedFPWidth::SaveVectors>(context); }
static inline void SYSV_ABI buildEntryBufferForCatchNoSIMD(Probe::Context& context) { buildEntryBufferForCatch<SavedFPWidth::DontSaveVectors>(context); }
static inline void prepareForTailCall(CCallHelpers& jit, const B3::StackmapGenerationParams& params, const Checked<int32_t>& tailCallStackOffsetFromFP)
{
Checked<int32_t> frameSize = params.code().frameSize();
Checked<int32_t> newStackOffset = frameSize + tailCallStackOffsetFromFP;
RegisterAtOffsetList calleeSaves = params.code().calleeSaveRegisterAtOffsetList();
// We will use sp-based offsets since the frame pointer is already pointing to the previous frame.
calleeSaves.adjustOffsets(frameSize);
jit.emitRestore(calleeSaves, MacroAssembler::stackPointerRegister);
// The return PC was saved on the stack in the tail call patchpoint.
#if CPU(X86_64)
newStackOffset -= Checked<int32_t>(sizeof(Register));
#elif CPU(ARM) || CPU(ARM64) || CPU(RISCV64)
jit.loadPtr(CCallHelpers::Address(MacroAssembler::stackPointerRegister, newStackOffset - Checked<int32_t>(sizeof(Register))), MacroAssembler::linkRegister);
#if CPU(ARM64E)
GPRReg callerSP = jit.scratchRegister();
jit.addPtr(MacroAssembler::TrustedImm32(frameSize + Checked<int32_t>(sizeof(CallerFrameAndPC))), MacroAssembler::stackPointerRegister, callerSP);
jit.untagPtr(callerSP, MacroAssembler::linkRegister);
jit.validateUntaggedPtr(MacroAssembler::linkRegister);
#endif
#else
UNREACHABLE_FOR_PLATFORM();
#endif
jit.addPtr(MacroAssembler::TrustedImm32(newStackOffset), MacroAssembler::stackPointerRegister);
}
#endif // ENABLE(WEBASSEMBLY_OMGJIT)
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY_OMGJIT) || ENABLE(WEBASSEMBLY_BBQJIT)
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