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28 // Tests of profiler-related functions from log.h
35 #include "src/codegen.h"
36 #include "src/disassembler.h"
37 #include "src/isolate.h"
39 #include "src/sampler.h"
40 #include "src/vm-state-inl.h"
41 #include "test/cctest/cctest.h"
42 #include "test/cctest/trace-extension.h"
51 using v8::internal::byte;
52 using v8::internal::Address;
53 using v8::internal::Handle;
54 using v8::internal::Isolate;
55 using v8::internal::JSFunction;
56 using v8::internal::TickSample;
59 static bool IsAddressWithinFuncCode(JSFunction* function, Address addr) {
60 i::Code* code = function->code();
61 return code->contains(addr);
65 static bool IsAddressWithinFuncCode(v8::Local<v8::Context> context,
66 const char* func_name,
68 v8::Local<v8::Value> func = context->Global()->Get(v8_str(func_name));
69 CHECK(func->IsFunction());
70 JSFunction* js_func = JSFunction::cast(*v8::Utils::OpenHandle(*func));
71 return IsAddressWithinFuncCode(js_func, addr);
75 // This C++ function is called as a constructor, to grab the frame pointer
76 // from the calling function. When this function runs, the stack contains
77 // a C_Entry frame and a Construct frame above the calling function's frame.
78 static void construct_call(const v8::FunctionCallbackInfo<v8::Value>& args) {
79 i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
80 i::StackFrameIterator frame_iterator(isolate);
81 CHECK(frame_iterator.frame()->is_exit());
82 frame_iterator.Advance();
83 CHECK(frame_iterator.frame()->is_construct());
84 frame_iterator.Advance();
85 i::StackFrame* calling_frame = frame_iterator.frame();
86 CHECK(calling_frame->is_java_script());
88 #if defined(V8_HOST_ARCH_32_BIT)
89 int32_t low_bits = reinterpret_cast<int32_t>(calling_frame->fp());
90 args.This()->Set(v8_str("low_bits"), v8_num(low_bits >> 1));
91 #elif defined(V8_HOST_ARCH_64_BIT)
92 uint64_t fp = reinterpret_cast<uint64_t>(calling_frame->fp());
93 int32_t low_bits = static_cast<int32_t>(fp & 0xffffffff);
94 int32_t high_bits = static_cast<int32_t>(fp >> 32);
95 args.This()->Set(v8_str("low_bits"), v8_num(low_bits));
96 args.This()->Set(v8_str("high_bits"), v8_num(high_bits));
98 #error Host architecture is neither 32-bit nor 64-bit.
100 args.GetReturnValue().Set(args.This());
104 // Use the API to create a JSFunction object that calls the above C++ function.
105 void CreateFramePointerGrabberConstructor(v8::Local<v8::Context> context,
106 const char* constructor_name) {
107 Local<v8::FunctionTemplate> constructor_template =
108 v8::FunctionTemplate::New(context->GetIsolate(), construct_call);
109 constructor_template->SetClassName(v8_str("FPGrabber"));
110 Local<Function> fun = constructor_template->GetFunction();
111 context->Global()->Set(v8_str(constructor_name), fun);
115 // Creates a global function named 'func_name' that calls the tracing
116 // function 'trace_func_name' with an actual EBP register value,
117 // encoded as one or two Smis.
118 static void CreateTraceCallerFunction(v8::Local<v8::Context> context,
119 const char* func_name,
120 const char* trace_func_name) {
121 i::EmbeddedVector<char, 256> trace_call_buf;
122 i::SNPrintF(trace_call_buf,
124 " fp = new FPGrabber();"
125 " %s(fp.low_bits, fp.high_bits);"
127 func_name, trace_func_name);
129 // Create the FPGrabber function, which grabs the caller's frame pointer
130 // when called as a constructor.
131 CreateFramePointerGrabberConstructor(context, "FPGrabber");
133 // Compile the script.
134 CompileRun(trace_call_buf.start());
138 // This test verifies that stack tracing works when called during
139 // execution of a native function called from JS code. In this case,
140 // TickSample::Trace uses Isolate::c_entry_fp as a starting point for stack
142 TEST(CFromJSStackTrace) {
143 // BUG(1303) Inlining of JSFuncDoTrace() in JSTrace below breaks this test.
144 i::FLAG_use_inlining = false;
147 i::TraceExtension::InitTraceEnv(&sample);
149 v8::HandleScope scope(CcTest::isolate());
150 v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
151 v8::Context::Scope context_scope(context);
153 // Create global function JSFuncDoTrace which calls
154 // extension function trace() with the current frame pointer value.
155 CreateTraceCallerFunction(context, "JSFuncDoTrace", "trace");
156 Local<Value> result = CompileRun(
157 "function JSTrace() {"
162 CHECK(!result.IsEmpty());
163 // When stack tracer is invoked, the stack should look as follows:
166 // JSFuncDoTrace() [JS] [captures EBP value and encodes it as Smi]
167 // trace(EBP) [native (extension)]
168 // DoTrace(EBP) [native]
171 CHECK(sample.has_external_callback);
172 CHECK_EQ(FUNCTION_ADDR(i::TraceExtension::Trace), sample.external_callback);
174 // Stack tracing will start from the first JS function, i.e. "JSFuncDoTrace"
176 CHECK_GT(sample.frames_count, base + 1);
178 CHECK(IsAddressWithinFuncCode(
179 context, "JSFuncDoTrace", sample.stack[base + 0]));
180 CHECK(IsAddressWithinFuncCode(context, "JSTrace", sample.stack[base + 1]));
184 // This test verifies that stack tracing works when called during
185 // execution of JS code. However, as calling TickSample::Trace requires
186 // entering native code, we can only emulate pure JS by erasing
187 // Isolate::c_entry_fp value. In this case, TickSample::Trace uses passed frame
188 // pointer value as a starting point for stack walking.
189 TEST(PureJSStackTrace) {
190 // This test does not pass with inlining enabled since inlined functions
191 // don't appear in the stack trace.
192 i::FLAG_use_inlining = false;
195 i::TraceExtension::InitTraceEnv(&sample);
197 v8::HandleScope scope(CcTest::isolate());
198 v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
199 v8::Context::Scope context_scope(context);
201 // Create global function JSFuncDoTrace which calls
202 // extension function js_trace() with the current frame pointer value.
203 CreateTraceCallerFunction(context, "JSFuncDoTrace", "js_trace");
204 Local<Value> result = CompileRun(
205 "function JSTrace() {"
208 "function OuterJSTrace() {"
213 CHECK(!result.IsEmpty());
214 // When stack tracer is invoked, the stack should look as follows:
216 // OuterJSTrace() [JS]
218 // JSFuncDoTrace() [JS]
219 // js_trace(EBP) [native (extension)]
220 // DoTraceHideCEntryFPAddress(EBP) [native]
224 CHECK(sample.has_external_callback);
225 CHECK_EQ(FUNCTION_ADDR(i::TraceExtension::JSTrace), sample.external_callback);
227 // Stack sampling will start from the caller of JSFuncDoTrace, i.e. "JSTrace"
229 CHECK_GT(sample.frames_count, base + 1);
230 CHECK(IsAddressWithinFuncCode(context, "JSTrace", sample.stack[base + 0]));
231 CHECK(IsAddressWithinFuncCode(
232 context, "OuterJSTrace", sample.stack[base + 1]));
236 static void CFuncDoTrace(byte dummy_parameter) {
239 fp = reinterpret_cast<Address>(__builtin_frame_address(0));
240 #elif defined _MSC_VER
241 // Approximate a frame pointer address. We compile without base pointers,
242 // so we can't trust ebp/rbp.
243 fp = &dummy_parameter - 2 * sizeof(void*); // NOLINT
245 #error Unexpected platform.
247 i::TraceExtension::DoTrace(fp);
251 static int CFunc(int depth) {
256 return CFunc(depth - 1) + 1;
261 // This test verifies that stack tracing doesn't crash when called on
262 // pure native code. TickSample::Trace only unrolls JS code, so we can't
263 // get any meaningful info here.
264 TEST(PureCStackTrace) {
266 i::TraceExtension::InitTraceEnv(&sample);
267 v8::HandleScope scope(CcTest::isolate());
268 v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
269 v8::Context::Scope context_scope(context);
270 // Check that sampler doesn't crash
271 CHECK_EQ(10, CFunc(10));
276 v8::HandleScope scope(CcTest::isolate());
277 v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
278 v8::Context::Scope context_scope(context);
279 CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
280 CompileRun("a = 1; b = a + 1;");
281 CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
282 CompileRun("js_entry_sp();");
283 CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
284 CompileRun("js_entry_sp_level2();");
285 CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());