1 // Copyright 2014 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 #include "test/cctest/trace-extension.h" 29 30 #include "src/sampler.h" 31 #include "test/cctest/cctest.h" 32 33 namespace v8 { 34 namespace internal { 35 36 const char* TraceExtension::kSource = 37 "native function trace();" 38 "native function js_trace();" 39 "native function js_entry_sp();" 40 "native function js_entry_sp_level2();"; 41 42 43 v8::Handle<v8::FunctionTemplate> TraceExtension::GetNativeFunctionTemplate( 44 v8::Isolate* isolate, v8::Handle<v8::String> name) { 45 if (name->Equals(v8::String::NewFromUtf8(isolate, "trace"))) { 46 return v8::FunctionTemplate::New(isolate, TraceExtension::Trace); 47 } else if (name->Equals(v8::String::NewFromUtf8(isolate, "js_trace"))) { 48 return v8::FunctionTemplate::New(isolate, TraceExtension::JSTrace); 49 } else if (name->Equals(v8::String::NewFromUtf8(isolate, "js_entry_sp"))) { 50 return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySP); 51 } else if (name->Equals(v8::String::NewFromUtf8(isolate, 52 "js_entry_sp_level2"))) { 53 return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySPLevel2); 54 } else { 55 CHECK(false); 56 return v8::Handle<v8::FunctionTemplate>(); 57 } 58 } 59 60 61 Address TraceExtension::GetFP(const v8::FunctionCallbackInfo<v8::Value>& args) { 62 // Convert frame pointer from encoding as smis in the arguments to a pointer. 63 CHECK_EQ(2, args.Length()); // Ignore second argument on 32-bit platform. 64 #if defined(V8_HOST_ARCH_32_BIT) 65 Address fp = *reinterpret_cast<Address*>(*args[0]); 66 #elif defined(V8_HOST_ARCH_64_BIT) 67 int64_t low_bits = *reinterpret_cast<uint64_t*>(*args[0]) >> 32; 68 int64_t high_bits = *reinterpret_cast<uint64_t*>(*args[1]); 69 Address fp = reinterpret_cast<Address>(high_bits | low_bits); 70 #else 71 #error Host architecture is neither 32-bit nor 64-bit. 72 #endif 73 printf("Trace: %p\n", fp); 74 return fp; 75 } 76 77 78 static struct { 79 TickSample* sample; 80 } trace_env = { NULL }; 81 82 83 void TraceExtension::InitTraceEnv(TickSample* sample) { 84 trace_env.sample = sample; 85 } 86 87 88 void TraceExtension::DoTrace(Address fp) { 89 RegisterState regs; 90 regs.fp = fp; 91 // sp is only used to define stack high bound 92 regs.sp = 93 reinterpret_cast<Address>(trace_env.sample) - 10240; 94 trace_env.sample->Init(CcTest::i_isolate(), regs); 95 } 96 97 98 void TraceExtension::Trace(const v8::FunctionCallbackInfo<v8::Value>& args) { 99 DoTrace(GetFP(args)); 100 } 101 102 103 // Hide c_entry_fp to emulate situation when sampling is done while 104 // pure JS code is being executed 105 static void DoTraceHideCEntryFPAddress(Address fp) { 106 v8::internal::Address saved_c_frame_fp = 107 *(CcTest::i_isolate()->c_entry_fp_address()); 108 CHECK(saved_c_frame_fp); 109 *(CcTest::i_isolate()->c_entry_fp_address()) = 0; 110 i::TraceExtension::DoTrace(fp); 111 *(CcTest::i_isolate()->c_entry_fp_address()) = saved_c_frame_fp; 112 } 113 114 115 void TraceExtension::JSTrace(const v8::FunctionCallbackInfo<v8::Value>& args) { 116 DoTraceHideCEntryFPAddress(GetFP(args)); 117 } 118 119 120 Address TraceExtension::GetJsEntrySp() { 121 CHECK_NE(NULL, CcTest::i_isolate()->thread_local_top()); 122 return CcTest::i_isolate()->js_entry_sp(); 123 } 124 125 126 void TraceExtension::JSEntrySP( 127 const v8::FunctionCallbackInfo<v8::Value>& args) { 128 CHECK_NE(0, GetJsEntrySp()); 129 } 130 131 132 void TraceExtension::JSEntrySPLevel2( 133 const v8::FunctionCallbackInfo<v8::Value>& args) { 134 v8::HandleScope scope(args.GetIsolate()); 135 const Address js_entry_sp = GetJsEntrySp(); 136 CHECK_NE(0, js_entry_sp); 137 CompileRun("js_entry_sp();"); 138 CHECK_EQ(js_entry_sp, GetJsEntrySp()); 139 } 140 141 142 } } // namespace v8::internal 143
