summaryrefslogtreecommitdiff
path: root/deps/v8/test/cctest/test-log-stack-tracer.cc
blob: 5bfc1d36beef64ef3c34d6229d9b430dac54fa5a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Tests of profiler-related functions from log.h

#include <stdlib.h>

#include "v8.h"

#include "api.h"
#include "codegen.h"
#include "log.h"
#include "isolate.h"
#include "cctest.h"
#include "disassembler.h"
#include "vm-state-inl.h"

using v8::Function;
using v8::Local;
using v8::Object;
using v8::Script;
using v8::String;
using v8::Value;

using v8::internal::byte;
using v8::internal::Address;
using v8::internal::Handle;
using v8::internal::Isolate;
using v8::internal::JSFunction;
using v8::internal::TickSample;


static struct {
  TickSample* sample;
} trace_env = { NULL };


static void InitTraceEnv(TickSample* sample) {
  trace_env.sample = sample;
}


static void DoTrace(Address fp) {
  trace_env.sample->fp = fp;
  // sp is only used to define stack high bound
  trace_env.sample->sp =
      reinterpret_cast<Address>(trace_env.sample) - 10240;
  trace_env.sample->Trace(Isolate::Current());
}


// Hide c_entry_fp to emulate situation when sampling is done while
// pure JS code is being executed
static void DoTraceHideCEntryFPAddress(Address fp) {
  v8::internal::Address saved_c_frame_fp =
      *(Isolate::Current()->c_entry_fp_address());
  CHECK(saved_c_frame_fp);
  *(Isolate::Current()->c_entry_fp_address()) = 0;
  DoTrace(fp);
  *(Isolate::Current()->c_entry_fp_address()) = saved_c_frame_fp;
}


// --- T r a c e   E x t e n s i o n ---

class TraceExtension : public v8::Extension {
 public:
  TraceExtension() : v8::Extension("v8/trace", kSource) { }
  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
      v8::Handle<String> name);
  static v8::Handle<v8::Value> Trace(const v8::Arguments& args);
  static v8::Handle<v8::Value> JSTrace(const v8::Arguments& args);
  static v8::Handle<v8::Value> JSEntrySP(const v8::Arguments& args);
  static v8::Handle<v8::Value> JSEntrySPLevel2(const v8::Arguments& args);
 private:
  static Address GetFP(const v8::Arguments& args);
  static const char* kSource;
};


const char* TraceExtension::kSource =
    "native function trace();"
    "native function js_trace();"
    "native function js_entry_sp();"
    "native function js_entry_sp_level2();";

v8::Handle<v8::FunctionTemplate> TraceExtension::GetNativeFunction(
    v8::Handle<String> name) {
  if (name->Equals(String::New("trace"))) {
    return v8::FunctionTemplate::New(TraceExtension::Trace);
  } else if (name->Equals(String::New("js_trace"))) {
    return v8::FunctionTemplate::New(TraceExtension::JSTrace);
  } else if (name->Equals(String::New("js_entry_sp"))) {
    return v8::FunctionTemplate::New(TraceExtension::JSEntrySP);
  } else if (name->Equals(String::New("js_entry_sp_level2"))) {
    return v8::FunctionTemplate::New(TraceExtension::JSEntrySPLevel2);
  } else {
    CHECK(false);
    return v8::Handle<v8::FunctionTemplate>();
  }
}


Address TraceExtension::GetFP(const v8::Arguments& args) {
  // Convert frame pointer from encoding as smis in the arguments to a pointer.
  CHECK_EQ(2, args.Length());  // Ignore second argument on 32-bit platform.
#if defined(V8_HOST_ARCH_32_BIT)
  Address fp = *reinterpret_cast<Address*>(*args[0]);
#elif defined(V8_HOST_ARCH_64_BIT)
  int64_t low_bits = *reinterpret_cast<uint64_t*>(*args[0]) >> 32;
  int64_t high_bits = *reinterpret_cast<uint64_t*>(*args[1]);
  Address fp = reinterpret_cast<Address>(high_bits | low_bits);
#else
#error Host architecture is neither 32-bit nor 64-bit.
#endif
  printf("Trace: %p\n", fp);
  return fp;
}


v8::Handle<v8::Value> TraceExtension::Trace(const v8::Arguments& args) {
  DoTrace(GetFP(args));
  return v8::Undefined();
}


v8::Handle<v8::Value> TraceExtension::JSTrace(const v8::Arguments& args) {
  DoTraceHideCEntryFPAddress(GetFP(args));
  return v8::Undefined();
}


static Address GetJsEntrySp() {
  CHECK_NE(NULL, i::Isolate::Current()->thread_local_top());
  return Isolate::js_entry_sp(i::Isolate::Current()->thread_local_top());
}


v8::Handle<v8::Value> TraceExtension::JSEntrySP(const v8::Arguments& args) {
  CHECK_NE(0, GetJsEntrySp());
  return v8::Undefined();
}


v8::Handle<v8::Value> TraceExtension::JSEntrySPLevel2(
    const v8::Arguments& args) {
  v8::HandleScope scope(args.GetIsolate());
  const Address js_entry_sp = GetJsEntrySp();
  CHECK_NE(0, js_entry_sp);
  CompileRun("js_entry_sp();");
  CHECK_EQ(js_entry_sp, GetJsEntrySp());
  return v8::Undefined();
}


static TraceExtension kTraceExtension;
v8::DeclareExtension kTraceExtensionDeclaration(&kTraceExtension);


static bool IsAddressWithinFuncCode(JSFunction* function, Address addr) {
  i::Code* code = function->code();
  return code->contains(addr);
}

static bool IsAddressWithinFuncCode(const char* func_name, Address addr) {
  v8::Local<v8::Value> func = CcTest::env()->Global()->Get(v8_str(func_name));
  CHECK(func->IsFunction());
  JSFunction* js_func = JSFunction::cast(*v8::Utils::OpenHandle(*func));
  return IsAddressWithinFuncCode(js_func, addr);
}


// This C++ function is called as a constructor, to grab the frame pointer
// from the calling function.  When this function runs, the stack contains
// a C_Entry frame and a Construct frame above the calling function's frame.
static v8::Handle<Value> construct_call(const v8::Arguments& args) {
  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
  i::StackFrameIterator frame_iterator(isolate);
  CHECK(frame_iterator.frame()->is_exit());
  frame_iterator.Advance();
  CHECK(frame_iterator.frame()->is_construct());
  frame_iterator.Advance();
  i::StackFrame* calling_frame = frame_iterator.frame();
  CHECK(calling_frame->is_java_script());

#if defined(V8_HOST_ARCH_32_BIT)
  int32_t low_bits = reinterpret_cast<int32_t>(calling_frame->fp());
  args.This()->Set(v8_str("low_bits"), v8_num(low_bits >> 1));
#elif defined(V8_HOST_ARCH_64_BIT)
  uint64_t fp = reinterpret_cast<uint64_t>(calling_frame->fp());
  int32_t low_bits = static_cast<int32_t>(fp & 0xffffffff);
  int32_t high_bits = static_cast<int32_t>(fp >> 32);
  args.This()->Set(v8_str("low_bits"), v8_num(low_bits));
  args.This()->Set(v8_str("high_bits"), v8_num(high_bits));
#else
#error Host architecture is neither 32-bit nor 64-bit.
#endif
  return args.This();
}


// Use the API to create a JSFunction object that calls the above C++ function.
void CreateFramePointerGrabberConstructor(const char* constructor_name) {
    Local<v8::FunctionTemplate> constructor_template =
        v8::FunctionTemplate::New(construct_call);
    constructor_template->SetClassName(v8_str("FPGrabber"));
    Local<Function> fun = constructor_template->GetFunction();
    CcTest::env()->Global()->Set(v8_str(constructor_name), fun);
}


// Creates a global function named 'func_name' that calls the tracing
// function 'trace_func_name' with an actual EBP register value,
// encoded as one or two Smis.
static void CreateTraceCallerFunction(const char* func_name,
                                      const char* trace_func_name) {
  i::EmbeddedVector<char, 256> trace_call_buf;
  i::OS::SNPrintF(trace_call_buf,
                  "function %s() {"
                  "  fp = new FPGrabber();"
                  "  %s(fp.low_bits, fp.high_bits);"
                  "}",
                  func_name, trace_func_name);

  // Create the FPGrabber function, which grabs the caller's frame pointer
  // when called as a constructor.
  CreateFramePointerGrabberConstructor("FPGrabber");

  // Compile the script.
  CompileRun(trace_call_buf.start());
}


// This test verifies that stack tracing works when called during
// execution of a native function called from JS code. In this case,
// TickSample::Trace uses Isolate::c_entry_fp as a starting point for stack
// walking.
TEST(CFromJSStackTrace) {
  // BUG(1303) Inlining of JSFuncDoTrace() in JSTrace below breaks this test.
  i::FLAG_use_inlining = false;

  TickSample sample;
  InitTraceEnv(&sample);

  CcTest::InitializeVM(TRACE_EXTENSION);
  v8::HandleScope scope(CcTest::isolate());
  // Create global function JSFuncDoTrace which calls
  // extension function trace() with the current frame pointer value.
  CreateTraceCallerFunction("JSFuncDoTrace", "trace");
  Local<Value> result = CompileRun(
      "function JSTrace() {"
      "         JSFuncDoTrace();"
      "};\n"
      "JSTrace();\n"
      "true;");
  CHECK(!result.IsEmpty());
  // When stack tracer is invoked, the stack should look as follows:
  // script [JS]
  //   JSTrace() [JS]
  //     JSFuncDoTrace() [JS] [captures EBP value and encodes it as Smi]
  //       trace(EBP) [native (extension)]
  //         DoTrace(EBP) [native]
  //           TickSample::Trace

  CHECK(sample.external_callback);
  CHECK_EQ(FUNCTION_ADDR(TraceExtension::Trace), sample.external_callback);

  // Stack tracing will start from the first JS function, i.e. "JSFuncDoTrace"
  int base = 0;
  CHECK_GT(sample.frames_count, base + 1);

  CHECK(IsAddressWithinFuncCode("JSFuncDoTrace", sample.stack[base + 0]));
  CHECK(IsAddressWithinFuncCode("JSTrace", sample.stack[base + 1]));
}


// This test verifies that stack tracing works when called during
// execution of JS code. However, as calling TickSample::Trace requires
// entering native code, we can only emulate pure JS by erasing
// Isolate::c_entry_fp value. In this case, TickSample::Trace uses passed frame
// pointer value as a starting point for stack walking.
TEST(PureJSStackTrace) {
  // This test does not pass with inlining enabled since inlined functions
  // don't appear in the stack trace.
  i::FLAG_use_inlining = false;

  TickSample sample;
  InitTraceEnv(&sample);

  CcTest::InitializeVM(TRACE_EXTENSION);
  v8::HandleScope scope(CcTest::isolate());
  // Create global function JSFuncDoTrace which calls
  // extension function js_trace() with the current frame pointer value.
  CreateTraceCallerFunction("JSFuncDoTrace", "js_trace");
  Local<Value> result = CompileRun(
      "function JSTrace() {"
      "         JSFuncDoTrace();"
      "};\n"
      "function OuterJSTrace() {"
      "         JSTrace();"
      "};\n"
      "OuterJSTrace();\n"
      "true;");
  CHECK(!result.IsEmpty());
  // When stack tracer is invoked, the stack should look as follows:
  // script [JS]
  //   OuterJSTrace() [JS]
  //     JSTrace() [JS]
  //       JSFuncDoTrace() [JS]
  //         js_trace(EBP) [native (extension)]
  //           DoTraceHideCEntryFPAddress(EBP) [native]
  //             TickSample::Trace
  //

  CHECK(sample.external_callback);
  CHECK_EQ(FUNCTION_ADDR(TraceExtension::JSTrace), sample.external_callback);

  // Stack sampling will start from the caller of JSFuncDoTrace, i.e. "JSTrace"
  int base = 0;
  CHECK_GT(sample.frames_count, base + 1);
  CHECK(IsAddressWithinFuncCode("JSTrace", sample.stack[base + 0]));
  CHECK(IsAddressWithinFuncCode("OuterJSTrace", sample.stack[base + 1]));
}


static void CFuncDoTrace(byte dummy_parameter) {
  Address fp;
#ifdef __GNUC__
  fp = reinterpret_cast<Address>(__builtin_frame_address(0));
#elif defined _MSC_VER
  // Approximate a frame pointer address. We compile without base pointers,
  // so we can't trust ebp/rbp.
  fp = &dummy_parameter - 2 * sizeof(void*);  // NOLINT
#else
#error Unexpected platform.
#endif
  DoTrace(fp);
}


static int CFunc(int depth) {
  if (depth <= 0) {
    CFuncDoTrace(0);
    return 0;
  } else {
    return CFunc(depth - 1) + 1;
  }
}


// This test verifies that stack tracing doesn't crash when called on
// pure native code. TickSample::Trace only unrolls JS code, so we can't
// get any meaningful info here.
TEST(PureCStackTrace) {
  TickSample sample;
  InitTraceEnv(&sample);
  CcTest::InitializeVM(TRACE_EXTENSION);
  // Check that sampler doesn't crash
  CHECK_EQ(10, CFunc(10));
}


TEST(JsEntrySp) {
  CcTest::InitializeVM(TRACE_EXTENSION);
  v8::HandleScope scope(CcTest::isolate());
  CHECK_EQ(0, GetJsEntrySp());
  CompileRun("a = 1; b = a + 1;");
  CHECK_EQ(0, GetJsEntrySp());
  CompileRun("js_entry_sp();");
  CHECK_EQ(0, GetJsEntrySp());
  CompileRun("js_entry_sp_level2();");
  CHECK_EQ(0, GetJsEntrySp());
}