| /* |
| * Copyright (C) 2016-2019 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. |
| */ |
| |
| #include "config.h" |
| #include "WasmBBQPlan.h" |
| |
| #if ENABLE(WEBASSEMBLY) |
| |
| #include "B3Compilation.h" |
| #include "WasmAirIRGenerator.h" |
| #include "WasmB3IRGenerator.h" |
| #include "WasmBinding.h" |
| #include "WasmCallee.h" |
| #include "WasmCallingConvention.h" |
| #include "WasmFaultSignalHandler.h" |
| #include "WasmMachineThreads.h" |
| #include "WasmMemory.h" |
| #include "WasmSignatureInlines.h" |
| #include "WasmTierUpCount.h" |
| #include "WasmValidate.h" |
| #include <wtf/DataLog.h> |
| #include <wtf/Locker.h> |
| #include <wtf/MonotonicTime.h> |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/SystemTracing.h> |
| #include <wtf/text/StringConcatenateNumbers.h> |
| |
| namespace JSC { namespace Wasm { |
| |
| namespace WasmBBQPlanInternal { |
| static constexpr bool verbose = false; |
| } |
| |
| BBQPlan::BBQPlan(Context* context, Ref<ModuleInformation> moduleInformation, uint32_t functionIndex, CodeBlock* codeBlock, CompletionTask&& completionTask) |
| : EntryPlan(context, WTFMove(moduleInformation), WTFMove(completionTask)) |
| , m_codeBlock(codeBlock) |
| , m_functionIndex(functionIndex) |
| { |
| setMode(m_codeBlock->mode()); |
| } |
| |
| bool BBQPlan::prepareImpl() |
| { |
| const auto& functions = m_moduleInformation->functions; |
| if (!tryReserveCapacity(m_wasmInternalFunctions, functions.size(), " WebAssembly functions") |
| || !tryReserveCapacity(m_compilationContexts, functions.size(), " compilation contexts") |
| || !tryReserveCapacity(m_tierUpCounts, functions.size(), " tier-up counts")) |
| return false; |
| |
| m_wasmInternalFunctions.resize(functions.size()); |
| m_compilationContexts.resize(functions.size()); |
| m_tierUpCounts.resize(functions.size()); |
| |
| return true; |
| } |
| |
| void BBQPlan::work(CompilationEffort effort) |
| { |
| if (!m_codeBlock) { |
| Base::work(effort); |
| return; |
| } |
| |
| CompilationContext context; |
| Vector<UnlinkedWasmToWasmCall> unlinkedWasmToWasmCalls; |
| std::unique_ptr<TierUpCount> tierUp = makeUnique<TierUpCount>(); |
| std::unique_ptr<InternalFunction> function = compileFunction(m_functionIndex, context, unlinkedWasmToWasmCalls, tierUp.get()); |
| |
| LinkBuffer linkBuffer(*context.wasmEntrypointJIT, nullptr, JITCompilationCanFail); |
| if (UNLIKELY(linkBuffer.didFailToAllocate())) { |
| Base::fail(holdLock(m_lock), makeString("Out of executable memory while tiering up function at index ", String::number(m_functionIndex))); |
| return; |
| } |
| |
| size_t functionIndexSpace = m_functionIndex + m_moduleInformation->importFunctionCount(); |
| SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[m_functionIndex]; |
| const Signature& signature = SignatureInformation::get(signatureIndex); |
| function->entrypoint.compilation = makeUnique<B3::Compilation>( |
| FINALIZE_WASM_CODE_FOR_MODE(CompilationMode::BBQMode, linkBuffer, B3CompilationPtrTag, "WebAssembly BBQ function[%i] %s name %s", m_functionIndex, signature.toString().ascii().data(), makeString(IndexOrName(functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace))).ascii().data()), |
| WTFMove(context.wasmEntrypointByproducts)); |
| |
| MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint; |
| { |
| Ref<BBQCallee> callee = BBQCallee::create(WTFMove(function->entrypoint), functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace), WTFMove(tierUp), WTFMove(unlinkedWasmToWasmCalls)); |
| MacroAssembler::repatchPointer(function->calleeMoveLocation, CalleeBits::boxWasm(callee.ptr())); |
| ASSERT(!m_codeBlock->m_bbqCallees[m_functionIndex]); |
| entrypoint = callee->entrypoint(); |
| |
| // We want to make sure we publish our callee at the same time as we link our callsites. This enables us to ensure we |
| // always call the fastest code. Any function linked after us will see our new code and the new callsites, which they |
| // will update. It's also ok if they publish their code before we reset the instruction caches because after we release |
| // the lock our code is ready to be published too. |
| LockHolder holder(m_codeBlock->m_lock); |
| m_codeBlock->m_bbqCallees[m_functionIndex] = callee.copyRef(); |
| { |
| LLIntCallee& llintCallee = *m_codeBlock->m_llintCallees[m_functionIndex]; |
| auto locker = holdLock(llintCallee.tierUpCounter().m_lock); |
| llintCallee.setReplacement(callee.copyRef()); |
| llintCallee.tierUpCounter().m_compilationStatus = LLIntTierUpCounter::CompilationStatus::Compiled; |
| } |
| for (auto& call : callee->wasmToWasmCallsites()) { |
| MacroAssemblerCodePtr<WasmEntryPtrTag> entrypoint; |
| if (call.functionIndexSpace < m_moduleInformation->importFunctionCount()) |
| entrypoint = m_codeBlock->m_wasmToWasmExitStubs[call.functionIndexSpace].code(); |
| else |
| entrypoint = m_codeBlock->wasmEntrypointCalleeFromFunctionIndexSpace(call.functionIndexSpace).entrypoint().retagged<WasmEntryPtrTag>(); |
| |
| MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel<WasmEntryPtrTag>(entrypoint)); |
| } |
| } |
| |
| // It's important to make sure we do this before we make any of the code we just compiled visible. If we didn't, we could end up |
| // where we are tiering up some function A to A' and we repatch some function B to call A' instead of A. Another CPU could see |
| // the updates to B but still not have reset its cache of A', which would lead to all kinds of badness. |
| resetInstructionCacheOnAllThreads(); |
| WTF::storeStoreFence(); // This probably isn't necessary but it's good to be paranoid. |
| |
| m_codeBlock->m_wasmIndirectCallEntryPoints[m_functionIndex] = entrypoint; |
| { |
| LockHolder holder(m_codeBlock->m_lock); |
| |
| auto repatchCalls = [&] (const Vector<UnlinkedWasmToWasmCall>& callsites) { |
| for (auto& call : callsites) { |
| dataLogLnIf(WasmBBQPlanInternal::verbose, "Considering repatching call at: ", RawPointer(call.callLocation.dataLocation()), " that targets ", call.functionIndexSpace); |
| if (call.functionIndexSpace == functionIndexSpace) { |
| dataLogLnIf(WasmBBQPlanInternal::verbose, "Repatching call at: ", RawPointer(call.callLocation.dataLocation()), " to ", RawPointer(entrypoint.executableAddress())); |
| MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel<WasmEntryPtrTag>(entrypoint)); |
| } |
| } |
| }; |
| |
| for (unsigned i = 0; i < m_codeBlock->m_wasmToWasmCallsites.size(); ++i) { |
| repatchCalls(m_codeBlock->m_wasmToWasmCallsites[i]); |
| if (LLIntCallee* llintCallee = m_codeBlock->m_llintCallees[i].get()) { |
| if (JITCallee* replacementCallee = llintCallee->replacement()) |
| repatchCalls(replacementCallee->wasmToWasmCallsites()); |
| if (OMGForOSREntryCallee* osrEntryCallee = llintCallee->osrEntryCallee()) |
| repatchCalls(osrEntryCallee->wasmToWasmCallsites()); |
| } |
| if (BBQCallee* bbqCallee = m_codeBlock->m_bbqCallees[i].get()) { |
| if (OMGCallee* replacementCallee = bbqCallee->replacement()) |
| repatchCalls(replacementCallee->wasmToWasmCallsites()); |
| if (OMGForOSREntryCallee* osrEntryCallee = bbqCallee->osrEntryCallee()) |
| repatchCalls(osrEntryCallee->wasmToWasmCallsites()); |
| } |
| } |
| } |
| |
| dataLogLnIf(WasmBBQPlanInternal::verbose, "Finished BBQ ", m_functionIndex); |
| |
| |
| auto locker = holdLock(m_lock); |
| moveToState(State::Completed); |
| runCompletionTasks(locker); |
| } |
| |
| void BBQPlan::compileFunction(uint32_t functionIndex) |
| { |
| m_unlinkedWasmToWasmCalls[functionIndex] = Vector<UnlinkedWasmToWasmCall>(); |
| |
| if (Options::useBBQTierUpChecks()) |
| m_tierUpCounts[functionIndex] = makeUnique<TierUpCount>(); |
| else |
| m_tierUpCounts[functionIndex] = nullptr; |
| |
| m_wasmInternalFunctions[functionIndex] = compileFunction(functionIndex, m_compilationContexts[functionIndex], m_unlinkedWasmToWasmCalls[functionIndex], m_tierUpCounts[functionIndex].get()); |
| |
| if (m_exportedFunctionIndices.contains(functionIndex) || m_moduleInformation->referencedFunctions().contains(functionIndex)) { |
| auto locker = holdLock(m_lock); |
| SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[functionIndex]; |
| const Signature& signature = SignatureInformation::get(signatureIndex); |
| auto result = m_embedderToWasmInternalFunctions.add(functionIndex, m_createEmbedderWrapper(*m_compilationContexts[functionIndex].embedderEntrypointJIT, signature, &m_unlinkedWasmToWasmCalls[functionIndex], m_moduleInformation.get(), m_mode, functionIndex)); |
| ASSERT_UNUSED(result, result.isNewEntry); |
| } |
| } |
| |
| std::unique_ptr<InternalFunction> BBQPlan::compileFunction(uint32_t functionIndex, CompilationContext& context, Vector<UnlinkedWasmToWasmCall>& unlinkedWasmToWasmCalls, TierUpCount* tierUp) |
| { |
| const auto& function = m_moduleInformation->functions[functionIndex]; |
| SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[functionIndex]; |
| const Signature& signature = SignatureInformation::get(signatureIndex); |
| unsigned functionIndexSpace = m_moduleInformation->importFunctionCount() + functionIndex; |
| ASSERT_UNUSED(functionIndexSpace, m_moduleInformation->signatureIndexFromFunctionIndexSpace(functionIndexSpace) == signatureIndex); |
| ASSERT(validateFunction(function, signature, m_moduleInformation.get())); |
| Expected<std::unique_ptr<InternalFunction>, String> parseAndCompileResult; |
| unsigned osrEntryScratchBufferSize = 0; |
| |
| // FIXME: Some webpages use very large Wasm module, and it exhausts all executable memory in ARM64 devices since the size of executable memory region is only limited to 128MB. |
| // The long term solution should be to introduce a Wasm interpreter. But as a short term solution, we introduce heuristics to switch back to BBQ B3 at the sacrifice of start-up time, |
| // as BBQ Air bloats such lengthy Wasm code and will consume a large amount of executable memory. |
| bool forceUsingB3 = false; |
| if (Options::webAssemblyBBQAirModeThreshold() && m_moduleInformation->codeSectionSize >= Options::webAssemblyBBQAirModeThreshold()) |
| forceUsingB3 = true; |
| |
| if (!forceUsingB3 && Options::wasmBBQUsesAir()) |
| parseAndCompileResult = parseAndCompileAir(context, function, signature, unlinkedWasmToWasmCalls, m_moduleInformation.get(), m_mode, functionIndex, tierUp, m_throwWasmException); |
| else |
| parseAndCompileResult = parseAndCompile(context, function, signature, unlinkedWasmToWasmCalls, osrEntryScratchBufferSize, m_moduleInformation.get(), m_mode, CompilationMode::BBQMode, functionIndex, UINT32_MAX, tierUp, m_throwWasmException); |
| |
| if (UNLIKELY(!parseAndCompileResult)) { |
| auto locker = holdLock(m_lock); |
| if (!m_errorMessage) { |
| // Multiple compiles could fail simultaneously. We arbitrarily choose the first. |
| fail(locker, makeString(parseAndCompileResult.error(), ", in function at index ", String::number(functionIndex))); // FIXME make this an Expected. |
| } |
| m_currentIndex = m_moduleInformation->functions.size(); |
| return nullptr; |
| } |
| |
| return WTFMove(*parseAndCompileResult); |
| } |
| |
| void BBQPlan::didCompleteCompilation(const AbstractLocker& locker) |
| { |
| for (uint32_t functionIndex = 0; functionIndex < m_moduleInformation->functions.size(); functionIndex++) { |
| CompilationContext& context = m_compilationContexts[functionIndex]; |
| SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[functionIndex]; |
| const Signature& signature = SignatureInformation::get(signatureIndex); |
| const uint32_t functionIndexSpace = functionIndex + m_moduleInformation->importFunctionCount(); |
| ASSERT(functionIndexSpace < m_moduleInformation->functionIndexSpaceSize()); |
| { |
| LinkBuffer linkBuffer(*context.wasmEntrypointJIT, nullptr, JITCompilationCanFail); |
| if (UNLIKELY(linkBuffer.didFailToAllocate())) { |
| Base::fail(locker, makeString("Out of executable memory in function at index ", String::number(functionIndex))); |
| return; |
| } |
| |
| m_wasmInternalFunctions[functionIndex]->entrypoint.compilation = makeUnique<B3::Compilation>( |
| FINALIZE_CODE(linkBuffer, B3CompilationPtrTag, "WebAssembly BBQ function[%i] %s name %s", functionIndex, signature.toString().ascii().data(), makeString(IndexOrName(functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace))).ascii().data()), |
| WTFMove(context.wasmEntrypointByproducts)); |
| } |
| |
| if (const auto& embedderToWasmInternalFunction = m_embedderToWasmInternalFunctions.get(functionIndex)) { |
| LinkBuffer linkBuffer(*context.embedderEntrypointJIT, nullptr, JITCompilationCanFail); |
| if (UNLIKELY(linkBuffer.didFailToAllocate())) { |
| Base::fail(locker, makeString("Out of executable memory in function entrypoint at index ", String::number(functionIndex))); |
| return; |
| } |
| |
| embedderToWasmInternalFunction->entrypoint.compilation = makeUnique<B3::Compilation>( |
| FINALIZE_CODE(linkBuffer, B3CompilationPtrTag, "Embedder->WebAssembly entrypoint[%i] %s name %s", functionIndex, signature.toString().ascii().data(), makeString(IndexOrName(functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace))).ascii().data()), |
| WTFMove(context.embedderEntrypointByproducts)); |
| } |
| } |
| |
| for (auto& unlinked : m_unlinkedWasmToWasmCalls) { |
| for (auto& call : unlinked) { |
| MacroAssemblerCodePtr<WasmEntryPtrTag> executableAddress; |
| if (m_moduleInformation->isImportedFunctionFromFunctionIndexSpace(call.functionIndexSpace)) { |
| // FIXME imports could have been linked in B3, instead of generating a patchpoint. This condition should be replaced by a RELEASE_ASSERT. https://bugs.webkit.org/show_bug.cgi?id=166462 |
| executableAddress = m_wasmToWasmExitStubs.at(call.functionIndexSpace).code(); |
| } else |
| executableAddress = m_wasmInternalFunctions.at(call.functionIndexSpace - m_moduleInformation->importFunctionCount())->entrypoint.compilation->code().retagged<WasmEntryPtrTag>(); |
| MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel<WasmEntryPtrTag>(executableAddress)); |
| } |
| } |
| } |
| |
| void BBQPlan::initializeCallees(const CalleeInitializer& callback) |
| { |
| ASSERT(!failed()); |
| for (unsigned internalFunctionIndex = 0; internalFunctionIndex < m_wasmInternalFunctions.size(); ++internalFunctionIndex) { |
| |
| RefPtr<Wasm::Callee> embedderEntrypointCallee; |
| if (auto embedderToWasmFunction = m_embedderToWasmInternalFunctions.get(internalFunctionIndex)) { |
| embedderEntrypointCallee = Wasm::EmbedderEntrypointCallee::create(WTFMove(embedderToWasmFunction->entrypoint)); |
| MacroAssembler::repatchPointer(embedderToWasmFunction->calleeMoveLocation, CalleeBits::boxWasm(embedderEntrypointCallee.get())); |
| } |
| |
| InternalFunction* function = m_wasmInternalFunctions[internalFunctionIndex].get(); |
| size_t functionIndexSpace = internalFunctionIndex + m_moduleInformation->importFunctionCount(); |
| Ref<Wasm::Callee> wasmEntrypointCallee = Wasm::BBQCallee::create(WTFMove(function->entrypoint), functionIndexSpace, m_moduleInformation->nameSection->get(functionIndexSpace), WTFMove(m_tierUpCounts[internalFunctionIndex]), WTFMove(m_unlinkedWasmToWasmCalls[internalFunctionIndex])); |
| MacroAssembler::repatchPointer(function->calleeMoveLocation, CalleeBits::boxWasm(wasmEntrypointCallee.ptr())); |
| |
| callback(internalFunctionIndex, WTFMove(embedderEntrypointCallee), WTFMove(wasmEntrypointCallee)); |
| } |
| } |
| |
| } } // namespace JSC::Wasm |
| |
| #endif // ENABLE(WEBASSEMBLY) |
