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
|
// Copyright 2014 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.
#include "test/cctest/trace-extension.h"
#include "include/v8-profiler.h"
#include "src/execution/vm-state-inl.h"
#include "src/objects/smi.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace internal {
const char* TraceExtension::kSource =
"native function trace();"
"native function js_trace();"
"native function js_entry_sp();"
"native function js_entry_sp_level2();";
v8::Local<v8::FunctionTemplate> TraceExtension::GetNativeFunctionTemplate(
v8::Isolate* isolate, v8::Local<v8::String> name) {
if (name->StrictEquals(
v8::String::NewFromUtf8(isolate, "trace", v8::NewStringType::kNormal)
.ToLocalChecked())) {
return v8::FunctionTemplate::New(isolate, TraceExtension::Trace);
} else if (name->StrictEquals(
v8::String::NewFromUtf8(isolate, "js_trace",
v8::NewStringType::kNormal)
.ToLocalChecked())) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSTrace);
} else if (name->StrictEquals(
v8::String::NewFromUtf8(isolate, "js_entry_sp",
v8::NewStringType::kNormal)
.ToLocalChecked())) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySP);
} else if (name->StrictEquals(
v8::String::NewFromUtf8(isolate, "js_entry_sp_level2",
v8::NewStringType::kNormal)
.ToLocalChecked())) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySPLevel2);
}
UNREACHABLE();
}
Address TraceExtension::GetFP(const v8::FunctionCallbackInfo<v8::Value>& 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)
uint64_t kSmiValueMask =
(static_cast<uintptr_t>(1) << (kSmiValueSize - 1)) - 1;
uint64_t low_bits =
Smi(*reinterpret_cast<Address*>(*args[0])).value() & kSmiValueMask;
uint64_t high_bits =
Smi(*reinterpret_cast<Address*>(*args[1])).value() & kSmiValueMask;
Address fp =
static_cast<Address>((high_bits << (kSmiValueSize - 1)) | low_bits);
#else
#error Host architecture is neither 32-bit nor 64-bit.
#endif
printf("Trace: %p\n", reinterpret_cast<void*>(fp));
return fp;
}
static struct { v8::TickSample* sample; } trace_env = {nullptr};
void TraceExtension::InitTraceEnv(v8::TickSample* sample) {
trace_env.sample = sample;
}
void TraceExtension::DoTrace(Address fp) {
RegisterState regs;
regs.fp = reinterpret_cast<void*>(fp);
// sp is only used to define stack high bound
regs.sp = reinterpret_cast<void*>(
reinterpret_cast<Address>(trace_env.sample) - 10240);
trace_env.sample->Init(CcTest::isolate(), regs,
v8::TickSample::kSkipCEntryFrame, true);
}
void TraceExtension::Trace(const v8::FunctionCallbackInfo<v8::Value>& args) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
i::VMState<EXTERNAL> state(isolate);
Address address = reinterpret_cast<Address>(&TraceExtension::Trace);
i::ExternalCallbackScope call_scope(isolate, address);
DoTrace(GetFP(args));
}
// 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 =
*(CcTest::i_isolate()->c_entry_fp_address());
CHECK(saved_c_frame_fp);
*(CcTest::i_isolate()->c_entry_fp_address()) = 0;
i::TraceExtension::DoTrace(fp);
*(CcTest::i_isolate()->c_entry_fp_address()) = saved_c_frame_fp;
}
void TraceExtension::JSTrace(const v8::FunctionCallbackInfo<v8::Value>& args) {
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
i::VMState<EXTERNAL> state(isolate);
Address address = reinterpret_cast<Address>(&TraceExtension::JSTrace);
i::ExternalCallbackScope call_scope(isolate, address);
DoTraceHideCEntryFPAddress(GetFP(args));
}
Address TraceExtension::GetJsEntrySp() {
CHECK(CcTest::i_isolate()->thread_local_top());
return CcTest::i_isolate()->js_entry_sp();
}
void TraceExtension::JSEntrySP(
const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK(GetJsEntrySp());
}
void TraceExtension::JSEntrySPLevel2(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::HandleScope scope(args.GetIsolate());
const Address js_entry_sp = GetJsEntrySp();
CHECK(js_entry_sp);
CompileRun("js_entry_sp();");
CHECK_EQ(js_entry_sp, GetJsEntrySp());
}
} // namespace internal
} // namespace v8
|
