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/*
* 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 "JSToWasm.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 <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), AsyncWork::FullCompile, 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) {
switch (m_state) {
case State::Initial:
parseAndValidateModule();
if (!hasWork()) {
ASSERT(m_state == State::Validated);
complete(holdLock(m_lock));
break;
}
FALLTHROUGH;
case State::Validated:
prepare();
break;
case State::Prepared:
compileFunctions(effort);
break;
default:
break;
}
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->at(m_functionIndex).get();
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 (m_codeBlock->m_llintCallees) {
LLIntCallee& llintCallee = m_codeBlock->m_llintCallees->at(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, createJSToWasmWrapper(*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);
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);
else
parseAndCompileResult = parseAndCompile(context, function, signature, unlinkedWasmToWasmCalls, osrEntryScratchBufferSize, m_moduleInformation.get(), m_mode, CompilationMode::BBQMode, functionIndex, UINT32_MAX, tierUp);
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<EmbedderEntrypointCallee> embedderEntrypointCallee;
if (auto embedderToWasmFunction = m_embedderToWasmInternalFunctions.get(internalFunctionIndex)) {
embedderEntrypointCallee = 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<BBQCallee> wasmEntrypointCallee = 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));
}
}
bool BBQPlan::didReceiveFunctionData(unsigned, const FunctionData&)
{
return true;
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)