src/cpu-ia32.cc
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00001 // Copyright 2006-2008 the V8 project authors. All rights reserved. 00002 // Redistribution and use in source and binary forms, with or without 00003 // modification, are permitted provided that the following conditions are 00004 // met: 00005 // 00006 // * Redistributions of source code must retain the above copyright 00007 // notice, this list of conditions and the following disclaimer. 00008 // * Redistributions in binary form must reproduce the above 00009 // copyright notice, this list of conditions and the following 00010 // disclaimer in the documentation and/or other materials provided 00011 // with the distribution. 00012 // * Neither the name of Google Inc. nor the names of its 00013 // contributors may be used to endorse or promote products derived 00014 // from this software without specific prior written permission. 00015 // 00016 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00017 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00018 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00019 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00020 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00021 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00022 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00023 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00024 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00025 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00026 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00027 00028 // CPU specific code for ia32 independent of OS goes here. 00029 00030 #include "v8.h" 00031 00032 #include "cpu.h" 00033 00034 namespace v8 { namespace internal { 00035 00036 void CPU::Setup() { 00037 // Nothing to do. 00038 } 00039 00040 00041 void CPU::FlushICache(void* start, size_t size) { 00042 // No need to flush the instruction cache on Intel. On Intel instruction 00043 // cache flushing is only necessary when multiple cores running the same 00044 // code simultaneously. V8 (and JavaScript) is single threaded and when code 00045 // is patched on an intel CPU the core performing the patching will have its 00046 // own instruction cache updated automatically. 00047 00048 // If flushing of the instruction cache becomes necessary Windows have the 00049 // API function FlushInstructionCache. 00050 } 00051 00052 00053 void CPU::DebugBreak() { 00054 #ifdef WIN32 00055 // To avoid Visual Studio runtime support the following code can be used 00056 // instead 00057 // __asm { int 3 } 00058 __debugbreak(); 00059 #else 00060 asm("int $3"); 00061 #endif 00062 } 00063 00064 } } // namespace v8::internal
