1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // CPU specific code for ia32 independent of OS goes here. 29 30 #ifdef __GNUC__ 31 #include "third_party/valgrind/valgrind.h" 32 #endif 33 34 #include "v8.h" 35 36 #if defined(V8_TARGET_ARCH_IA32) 37 38 #include "cpu.h" 39 #include "macro-assembler.h" 40 41 namespace v8 { 42 namespace internal { 43 44 void CPU::SetUp() { 45 CpuFeatures::Probe(); 46 } 47 48 49 bool CPU::SupportsCrankshaft() { 50 return CpuFeatures::IsSupported(SSE2); 51 } 52 53 54 void CPU::FlushICache(void* start, size_t size) { 55 // No need to flush the instruction cache on Intel. On Intel instruction 56 // cache flushing is only necessary when multiple cores running the same 57 // code simultaneously. V8 (and JavaScript) is single threaded and when code 58 // is patched on an intel CPU the core performing the patching will have its 59 // own instruction cache updated automatically. 60 61 // If flushing of the instruction cache becomes necessary Windows has the 62 // API function FlushInstructionCache. 63 64 // By default, valgrind only checks the stack for writes that might need to 65 // invalidate already cached translated code. This leads to random 66 // instability when code patches or moves are sometimes unnoticed. One 67 // solution is to run valgrind with --smc-check=all, but this comes at a big 68 // performance cost. We can notify valgrind to invalidate its cache. 69 #ifdef VALGRIND_DISCARD_TRANSLATIONS 70 unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size); 71 USE(res); 72 #endif 73 } 74 75 76 void CPU::DebugBreak() { 77 #ifdef _MSC_VER 78 // To avoid Visual Studio runtime support the following code can be used 79 // instead 80 // __asm { int 3 } 81 __debugbreak(); 82 #else 83 asm("int $3"); 84 #endif 85 } 86 87 } } // namespace v8::internal 88 89 #endif // V8_TARGET_ARCH_IA32 90
