/* * Copyright (C) 2013 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 "FTLOSREntry.h" #include "CallFrame.h" #include "CodeBlock.h" #include "DFGJITCode.h" #include "FTLForOSREntryJITCode.h" #include "JSStackInlines.h" #if ENABLE(FTL_JIT) namespace JSC { namespace FTL { void* prepareOSREntry( ExecState* exec, CodeBlock* dfgCodeBlock, CodeBlock* entryCodeBlock, unsigned bytecodeIndex, unsigned streamIndex) { VM& vm = exec->vm(); CodeBlock* baseline = dfgCodeBlock->baselineVersion(); DFG::JITCode* dfgCode = dfgCodeBlock->jitCode()->dfg(); ForOSREntryJITCode* entryCode = entryCodeBlock->jitCode()->ftlForOSREntry(); if (Options::verboseOSR()) { dataLog( "FTL OSR from ", *dfgCodeBlock, " to ", *entryCodeBlock, " at bc#", bytecodeIndex, ".\n"); } if (bytecodeIndex != entryCode->bytecodeIndex()) { if (Options::verboseOSR()) dataLog(" OSR failed because we don't have an entrypoint for bc#", bytecodeIndex, "; ours is for bc#", entryCode->bytecodeIndex()); return 0; } Operands values; dfgCode->reconstruct( exec, dfgCodeBlock, CodeOrigin(bytecodeIndex), streamIndex, values); if (Options::verboseOSR()) dataLog(" Values at entry: ", values, "\n"); for (int argument = values.numberOfArguments(); argument--;) { RELEASE_ASSERT( exec->r(virtualRegisterForArgument(argument).offset()).jsValue() == values.argument(argument)); } RELEASE_ASSERT( static_cast(values.numberOfLocals()) == baseline->m_numCalleeRegisters); EncodedJSValue* scratch = static_cast( entryCode->entryBuffer()->dataBuffer()); for (int local = values.numberOfLocals(); local--;) scratch[local] = JSValue::encode(values.local(local)); int stackFrameSize = entryCode->common.requiredRegisterCountForExecutionAndExit(); if (!vm.interpreter->stack().grow(&exec->registers()[virtualRegisterForLocal(stackFrameSize).offset()])) { if (Options::verboseOSR()) dataLog(" OSR failed because stack growth failed.\n"); return 0; } exec->setCodeBlock(entryCodeBlock); void* result = entryCode->addressForCall().executableAddress(); if (Options::verboseOSR()) dataLog(" Entry will succeed, going to address", RawPointer(result), "\n"); return result; } } } // namespace JSC::FTL #endif // ENABLE(FTL_JIT)