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// Copyright 2014 the V8 project authors. All rights reserved.
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// 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.
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "test/cctest/trace-extension.h"
#include "include/v8-profiler.h"
#include "include/v8-template.h"
#include "src/execution/vm-state-inl.h"
#include "src/objects/smi.h"
#include "src/profiler/tick-sample.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::NewFromUtf8Literal(isolate, "trace"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::Trace);
} else if (name->StrictEquals(
v8::String::NewFromUtf8Literal(isolate, "js_trace"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSTrace);
} else if (name->StrictEquals(
v8::String::NewFromUtf8Literal(isolate, "js_entry_sp"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySP);
} else if (name->StrictEquals(v8::String::NewFromUtf8Literal(
isolate, "js_entry_sp_level2"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySPLevel2);
}
UNREACHABLE();
}
Address TraceExtension::GetFP(const v8::FunctionCallbackInfo<v8::Value>& info) {
// Convert frame pointer from encoding as smis in the arguments to a pointer.
CHECK_EQ(2, info.Length()); // Ignore second argument on 32-bit platform.
CHECK(i::ValidateCallbackInfo(info));
#if defined(V8_HOST_ARCH_32_BIT)
Address fp = *reinterpret_cast<Address*>(*info[0]);
#elif defined(V8_HOST_ARCH_64_BIT)
uint64_t kSmiValueMask =
(static_cast<uintptr_t>(1) << (kSmiValueSize - 1)) - 1;
uint64_t low_bits =
Tagged<Smi>(*reinterpret_cast<Address*>(*info[0])).value() &
kSmiValueMask;
uint64_t high_bits =
Tagged<Smi>(*reinterpret_cast<Address*>(*info[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 { TickSample* sample; } trace_env = {nullptr};
void TraceExtension::InitTraceEnv(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::i_isolate(), regs,
TickSample::kSkipCEntryFrame, true);
}
void TraceExtension::Trace(const v8::FunctionCallbackInfo<v8::Value>& info) {
CHECK(i::ValidateCallbackInfo(info));
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
i::VMState<EXTERNAL> state(isolate);
Address address = reinterpret_cast<Address>(&TraceExtension::Trace);
i::ExternalCallbackScope call_scope(isolate, address);
DoTrace(GetFP(info));
}
// 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>& info) {
CHECK(i::ValidateCallbackInfo(info));
i::Isolate* isolate = reinterpret_cast<i::Isolate*>(info.GetIsolate());
i::VMState<EXTERNAL> state(isolate);
Address address = reinterpret_cast<Address>(&TraceExtension::JSTrace);
i::ExternalCallbackScope call_scope(isolate, address);
DoTraceHideCEntryFPAddress(GetFP(info));
}
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>& info) {
CHECK(i::ValidateCallbackInfo(info));
CHECK(GetJsEntrySp());
}
void TraceExtension::JSEntrySPLevel2(
const v8::FunctionCallbackInfo<v8::Value>& info) {
CHECK(i::ValidateCallbackInfo(info));
v8::HandleScope scope(info.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
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