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/*
* Copyright (C) 2016-2020 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 "WasmPlan.h"
#if ENABLE(WEBASSEMBLY)
#include "WasmCallee.h"
#include "WasmCodeBlock.h"
#include "WasmMachineThreads.h"
#include <wtf/DataLog.h>
#include <wtf/Locker.h>
#include <wtf/StdLibExtras.h>
namespace JSC { namespace Wasm {
namespace WasmPlanInternal {
static constexpr bool verbose = false;
}
Plan::Plan(Context* context, Ref<ModuleInformation> info, CompletionTask&& task)
: m_moduleInformation(WTFMove(info))
{
m_completionTasks.append(std::make_pair(context, WTFMove(task)));
}
Plan::Plan(Context* context, CompletionTask&& task)
: m_moduleInformation(ModuleInformation::create())
{
m_completionTasks.append(std::make_pair(context, WTFMove(task)));
}
void Plan::runCompletionTasks()
{
ASSERT(isComplete() && !hasWork());
for (auto& task : m_completionTasks)
task.second->run(*this);
m_completionTasks.clear();
m_completed.notifyAll();
}
void Plan::addCompletionTask(Context* context, CompletionTask&& task)
{
Locker locker { m_lock };
if (!isComplete())
m_completionTasks.append(std::make_pair(context, WTFMove(task)));
else
task->run(*this);
}
void Plan::waitForCompletion()
{
Locker locker { m_lock };
if (!isComplete()) {
m_completed.wait(m_lock);
}
}
bool Plan::tryRemoveContextAndCancelIfLast(Context& context)
{
Locker locker { m_lock };
if (ASSERT_ENABLED) {
// We allow the first completion task to not have a Context.
for (unsigned i = 1; i < m_completionTasks.size(); ++i)
ASSERT(m_completionTasks[i].first);
}
bool removedAnyTasks = false;
m_completionTasks.removeAllMatching([&] (const std::pair<Context*, CompletionTask>& pair) {
bool shouldRemove = pair.first == &context;
removedAnyTasks |= shouldRemove;
return shouldRemove;
});
if (!removedAnyTasks)
return false;
if (isComplete()) {
// We trivially cancel anything that's completed.
return true;
}
// FIXME: Make 0 index not so magical: https://bugs.webkit.org/show_bug.cgi?id=171395
if (m_completionTasks.isEmpty() || (m_completionTasks.size() == 1 && !m_completionTasks[0].first)) {
fail("WebAssembly Plan was cancelled. If you see this error message please file a bug at bugs.webkit.org!"_s);
return true;
}
return false;
}
void Plan::fail(String&& errorMessage)
{
if (failed())
return;
ASSERT(errorMessage);
dataLogLnIf(WasmPlanInternal::verbose, "failing with message: ", errorMessage);
m_errorMessage = WTFMove(errorMessage);
complete();
}
#if ENABLE(WEBASSEMBLY_B3JIT)
void Plan::updateCallSitesToCallUs(CodeBlock& codeBlock, CodeLocationLabel<WasmEntryPtrTag> entrypoint, uint32_t functionIndex, uint32_t functionIndexSpace)
{
HashMap<void*, CodeLocationLabel<WasmEntryPtrTag>> stagedCalls;
auto stageRepatch = [&] (const Vector<UnlinkedWasmToWasmCall>& callsites) {
for (auto& call : callsites) {
if (call.functionIndexSpace == functionIndexSpace) {
CodeLocationLabel<WasmEntryPtrTag> target = MacroAssembler::prepareForAtomicRepatchNearCallConcurrently(call.callLocation, entrypoint);
stagedCalls.add(call.callLocation.dataLocation(), target);
}
}
};
for (unsigned i = 0; i < codeBlock.m_wasmToWasmCallsites.size(); ++i) {
stageRepatch(codeBlock.m_wasmToWasmCallsites[i]);
if (codeBlock.m_llintCallees) {
LLIntCallee& llintCallee = codeBlock.m_llintCallees->at(i).get();
if (JITCallee* replacementCallee = llintCallee.replacement(codeBlock.mode()))
stageRepatch(replacementCallee->wasmToWasmCallsites());
if (OMGForOSREntryCallee* osrEntryCallee = llintCallee.osrEntryCallee(codeBlock.mode()))
stageRepatch(osrEntryCallee->wasmToWasmCallsites());
}
if (BBQCallee* bbqCallee = codeBlock.m_bbqCallees[i].get()) {
if (OMGCallee* replacementCallee = bbqCallee->replacement())
stageRepatch(replacementCallee->wasmToWasmCallsites());
if (OMGForOSREntryCallee* osrEntryCallee = bbqCallee->osrEntryCallee())
stageRepatch(osrEntryCallee->wasmToWasmCallsites());
}
}
// 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.
codeBlock.m_wasmIndirectCallEntryPoints[functionIndex] = entrypoint;
auto repatchCalls = [&] (const Vector<UnlinkedWasmToWasmCall>& callsites) {
for (auto& call : callsites) {
dataLogLnIf(WasmPlanInternal::verbose, "Considering repatching call at: ", RawPointer(call.callLocation.dataLocation()), " that targets ", call.functionIndexSpace);
if (call.functionIndexSpace == functionIndexSpace) {
dataLogLnIf(WasmPlanInternal::verbose, "Repatching call at: ", RawPointer(call.callLocation.dataLocation()), " to ", RawPointer(entrypoint.executableAddress()));
MacroAssembler::repatchNearCall(call.callLocation, stagedCalls.get(call.callLocation.dataLocation()));
}
}
};
for (unsigned i = 0; i < codeBlock.m_wasmToWasmCallsites.size(); ++i) {
repatchCalls(codeBlock.m_wasmToWasmCallsites[i]);
if (codeBlock.m_llintCallees) {
LLIntCallee& llintCallee = codeBlock.m_llintCallees->at(i).get();
if (JITCallee* replacementCallee = llintCallee.replacement(codeBlock.mode()))
repatchCalls(replacementCallee->wasmToWasmCallsites());
if (OMGForOSREntryCallee* osrEntryCallee = llintCallee.osrEntryCallee(codeBlock.mode()))
repatchCalls(osrEntryCallee->wasmToWasmCallsites());
}
if (BBQCallee* bbqCallee = codeBlock.m_bbqCallees[i].get()) {
if (OMGCallee* replacementCallee = bbqCallee->replacement())
repatchCalls(replacementCallee->wasmToWasmCallsites());
if (OMGForOSREntryCallee* osrEntryCallee = bbqCallee->osrEntryCallee())
repatchCalls(osrEntryCallee->wasmToWasmCallsites());
}
}
}
#endif
Plan::~Plan() { }
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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