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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.
*/
#include "config.h"
#include "WasmOMGPlan.h"
#if ENABLE(WEBASSEMBLY)
#include "B3Compilation.h"
#include "B3OpaqueByproducts.h"
#include "JSCInlines.h"
#include "JSWebAssemblyModule.h"
#include "LinkBuffer.h"
#include "WasmB3IRGenerator.h"
#include "WasmContext.h"
#include "WasmMachineThreads.h"
#include "WasmMemory.h"
#include "WasmValidate.h"
#include "WasmWorklist.h"
#include <wtf/DataLog.h>
#include <wtf/Locker.h>
#include <wtf/MonotonicTime.h>
#include <wtf/StdLibExtras.h>
#include <wtf/ThreadMessage.h>
namespace JSC { namespace Wasm {
static const bool verbose = false;
OMGPlan::OMGPlan(Ref<Module> module, uint32_t functionIndex, MemoryMode mode, CompletionTask&& task)
: Base(nullptr, makeRef(const_cast<ModuleInformation&>(module->moduleInformation())), WTFMove(task))
, m_module(module.copyRef())
, m_codeBlock(*module->codeBlockFor(mode))
, m_functionIndex(functionIndex)
{
setMode(mode);
ASSERT(m_codeBlock->runnable());
ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(m_mode));
dataLogLnIf(verbose, "Starting OMG plan for ", functionIndex, " of module: ", RawPointer(&m_module.get()));
}
void OMGPlan::work(CompilationEffort)
{
ASSERT(m_codeBlock->runnable());
ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(mode()));
const FunctionLocationInBinary& location = m_moduleInformation->functionLocationInBinary[m_functionIndex];
const uint8_t* functionStart = m_moduleInformation->source.data() + location.start;
const size_t functionLength = location.end - location.start;
ASSERT(functionStart + functionLength <= m_moduleInformation->source.end());
const uint32_t functionIndexSpace = m_functionIndex + m_module->moduleInformation().importFunctionCount();
ASSERT(functionIndexSpace < m_module->moduleInformation().functionIndexSpaceSize());
SignatureIndex signatureIndex = m_moduleInformation->internalFunctionSignatureIndices[m_functionIndex];
const Signature& signature = SignatureInformation::get(signatureIndex);
ASSERT(validateFunction(functionStart, functionLength, signature, m_moduleInformation.get()));
Vector<UnlinkedWasmToWasmCall> unlinkedCalls;
CompilationContext context;
auto parseAndCompileResult = parseAndCompile(context, functionStart, functionLength, signature, unlinkedCalls, m_moduleInformation.get(), m_mode, CompilationMode::OMGMode, m_functionIndex);
if (UNLIKELY(!parseAndCompileResult)) {
fail(holdLock(m_lock), makeString(parseAndCompileResult.error(), "when trying to tier up ", String::number(m_functionIndex)));
return;
}
Entrypoint omgEntrypoint;
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;
}
omgEntrypoint.compilation = std::make_unique<B3::Compilation>(
FINALIZE_CODE(linkBuffer, ("WebAssembly OMG function[%i] %s", m_functionIndex, SignatureInformation::get(signatureIndex).toString().ascii().data())),
WTFMove(context.wasmEntrypointByproducts));
omgEntrypoint.calleeSaveRegisters = WTFMove(parseAndCompileResult.value()->entrypoint.calleeSaveRegisters);
void* entrypoint;
{
ASSERT(m_codeBlock.ptr() == m_module->codeBlockFor(mode()));
Ref<Callee> callee = Callee::create(WTFMove(omgEntrypoint), functionIndexSpace, m_moduleInformation->nameSection.get(functionIndexSpace));
MacroAssembler::repatchPointer(parseAndCompileResult.value()->calleeMoveLocation, CalleeBits::boxWasm(callee.ptr()));
ASSERT(!m_codeBlock->m_optimizedCallees[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_optimizedCallees[m_functionIndex] = WTFMove(callee);
for (auto& call : unlinkedCalls) {
void* entrypoint;
if (call.functionIndexSpace < m_module->moduleInformation().importFunctionCount())
entrypoint = m_codeBlock->m_wasmToWasmExitStubs[call.functionIndexSpace].code().executableAddress();
else
entrypoint = m_codeBlock->wasmEntrypointCalleeFromFunctionIndexSpace(call.functionIndexSpace).entrypoint();
MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel(entrypoint));
}
unlinkedCalls = std::exchange(m_codeBlock->m_wasmToWasmCallsites[m_functionIndex], unlinkedCalls);
}
// 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(verbose, "Considering repatching call at: ", RawPointer(call.callLocation.dataLocation()), " that targets ", call.functionIndexSpace);
if (call.functionIndexSpace == functionIndexSpace) {
dataLogLnIf(verbose, "Repatching call at: ", RawPointer(call.callLocation.dataLocation()), " to ", RawPointer(entrypoint));
MacroAssembler::repatchNearCall(call.callLocation, CodeLocationLabel(entrypoint));
}
}
};
for (unsigned i = 0; i < m_codeBlock->m_wasmToWasmCallsites.size(); ++i) {
if (i != functionIndexSpace)
repatchCalls(m_codeBlock->m_wasmToWasmCallsites[i]);
}
// Make sure we repatch any recursive calls.
repatchCalls(unlinkedCalls);
}
dataLogLnIf(verbose, "Finished with tier up count at: ", m_codeBlock->tierUpCount(m_functionIndex).count());
complete(holdLock(m_lock));
}
void runOMGPlanForIndex(Context* context, uint32_t functionIndex)
{
JSWebAssemblyCodeBlock* codeBlock = context->codeBlock();
ASSERT(context->memoryMode() == codeBlock->m_codeBlock->mode());
if (codeBlock->m_codeBlock->tierUpCount(functionIndex).shouldStartTierUp()) {
Ref<Plan> plan = adoptRef(*new OMGPlan(context->module()->module(), functionIndex, codeBlock->m_codeBlock->mode(), Plan::dontFinalize()));
ensureWorklist().enqueue(plan.copyRef());
if (UNLIKELY(!Options::useConcurrentJIT()))
plan->waitForCompletion();
}
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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