1 // Copyright 2014 the V8 project authors. All rights reserved.
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3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
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9 // copyright notice, this list of conditions and the following
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15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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
GetNativeFunctionTemplate(v8::Isolate * isolate,v8::Handle<v8::String> name)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
GetFP(const v8::FunctionCallbackInfo<v8::Value> & args)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
InitTraceEnv(TickSample * sample)83 void TraceExtension::InitTraceEnv(TickSample* sample) {
84 trace_env.sample = sample;
85 }
86
87
DoTrace(Address fp)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
Trace(const v8::FunctionCallbackInfo<v8::Value> & args)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
DoTraceHideCEntryFPAddress(Address fp)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
JSTrace(const v8::FunctionCallbackInfo<v8::Value> & args)115 void TraceExtension::JSTrace(const v8::FunctionCallbackInfo<v8::Value>& args) {
116 DoTraceHideCEntryFPAddress(GetFP(args));
117 }
118
119
GetJsEntrySp()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
JSEntrySP(const v8::FunctionCallbackInfo<v8::Value> & args)126 void TraceExtension::JSEntrySP(
127 const v8::FunctionCallbackInfo<v8::Value>& args) {
128 CHECK_NE(0, GetJsEntrySp());
129 }
130
131
JSEntrySPLevel2(const v8::FunctionCallbackInfo<v8::Value> & args)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