mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-12-12 14:27:30 +00:00
125 lines
4.8 KiB
C++
125 lines
4.8 KiB
C++
/*
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* Copyright (C) 2013-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "FTLOSREntry.h"
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#include "CallFrame.h"
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#include "CodeBlock.h"
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#include "DFGJITCode.h"
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#include "FTLForOSREntryJITCode.h"
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#include "OperandsInlines.h"
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#include "JSCInlines.h"
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#include "VMInlines.h"
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#if ENABLE(FTL_JIT)
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namespace JSC { namespace FTL {
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SUPPRESS_ASAN
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void* prepareOSREntry(
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ExecState* exec, CodeBlock* dfgCodeBlock, CodeBlock* entryCodeBlock,
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unsigned bytecodeIndex, unsigned streamIndex)
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{
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VM& vm = exec->vm();
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CodeBlock* baseline = dfgCodeBlock->baselineVersion();
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ExecutableBase* executable = dfgCodeBlock->ownerExecutable();
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DFG::JITCode* dfgCode = dfgCodeBlock->jitCode()->dfg();
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ForOSREntryJITCode* entryCode = entryCodeBlock->jitCode()->ftlForOSREntry();
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if (!entryCode->dfgCommon()->isStillValid) {
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dfgCode->clearOSREntryBlockAndResetThresholds(dfgCodeBlock);
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return 0;
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}
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if (Options::verboseOSR()) {
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dataLog(
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"FTL OSR from ", *dfgCodeBlock, " to ", *entryCodeBlock, " at bc#",
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bytecodeIndex, ".\n");
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}
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if (bytecodeIndex)
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jsCast<ScriptExecutable*>(executable)->setDidTryToEnterInLoop(true);
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if (bytecodeIndex != entryCode->bytecodeIndex()) {
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if (Options::verboseOSR())
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dataLog(" OSR failed because we don't have an entrypoint for bc#", bytecodeIndex, "; ours is for bc#", entryCode->bytecodeIndex(), "\n");
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return 0;
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}
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Operands<Optional<JSValue>> values;
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dfgCode->reconstruct(
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exec, dfgCodeBlock, CodeOrigin(bytecodeIndex), streamIndex, values);
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if (Options::verboseOSR())
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dataLog(" Values at entry: ", values, "\n");
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for (int argument = values.numberOfArguments(); argument--;) {
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JSValue valueOnStack = exec->r(virtualRegisterForArgument(argument).offset()).asanUnsafeJSValue();
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Optional<JSValue> reconstructedValue = values.argument(argument);
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if ((reconstructedValue && valueOnStack == reconstructedValue.value()) || !argument)
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continue;
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dataLog("Mismatch between reconstructed values and the value on the stack for argument arg", argument, " for ", *entryCodeBlock, " at bc#", bytecodeIndex, ":\n");
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dataLog(" Value on stack: ", valueOnStack, "\n");
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dataLog(" Reconstructed value: ", reconstructedValue, "\n");
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RELEASE_ASSERT_NOT_REACHED();
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}
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RELEASE_ASSERT(
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static_cast<int>(values.numberOfLocals()) == baseline->numCalleeLocals());
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EncodedJSValue* scratch = static_cast<EncodedJSValue*>(
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entryCode->entryBuffer()->dataBuffer());
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for (int local = values.numberOfLocals(); local--;) {
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Optional<JSValue> value = values.local(local);
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if (value)
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scratch[local] = JSValue::encode(value.value());
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else
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scratch[local] = JSValue::encode(JSValue());
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}
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int stackFrameSize = entryCode->common.requiredRegisterCountForExecutionAndExit();
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if (UNLIKELY(!vm.ensureStackCapacityFor(&exec->registers()[virtualRegisterForLocal(stackFrameSize - 1).offset()]))) {
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if (Options::verboseOSR())
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dataLog(" OSR failed because stack growth failed.\n");
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return 0;
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}
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exec->setCodeBlock(entryCodeBlock);
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void* result = entryCode->addressForCall(ArityCheckNotRequired).executableAddress();
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if (Options::verboseOSR())
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dataLog(" Entry will succeed, going to address ", RawPointer(result), "\n");
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return result;
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}
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} } // namespace JSC::FTL
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#endif // ENABLE(FTL_JIT)
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