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| 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 "trace-extension.h" |
| 29 |
| 30 #include "cctest.h" |
| 31 #include "sampler.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 |
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