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// 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 "trace-extension.h"
#include "cctest.h"
#include "sampler.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::Handle<v8::FunctionTemplate> TraceExtension::GetNativeFunctionTemplate(
v8::Isolate* isolate, v8::Handle<v8::String> name) {
if (name->Equals(v8::String::NewFromUtf8(isolate, "trace"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::Trace);
} else if (name->Equals(v8::String::NewFromUtf8(isolate, "js_trace"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSTrace);
} else if (name->Equals(v8::String::NewFromUtf8(isolate, "js_entry_sp"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySP);
} else if (name->Equals(v8::String::NewFromUtf8(isolate,
"js_entry_sp_level2"))) {
return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySPLevel2);
} else {
CHECK(false);
return v8::Handle<v8::FunctionTemplate>();
}
}
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)
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;
}
static struct {
TickSample* sample;
} trace_env = { NULL };
void TraceExtension::InitTraceEnv(TickSample* sample) {
trace_env.sample = sample;
}
void TraceExtension::DoTrace(Address fp) {
RegisterState regs;
regs.fp = fp;
// sp is only used to define stack high bound
regs.sp =
reinterpret_cast<Address>(trace_env.sample) - 10240;
trace_env.sample->Init(CcTest::i_isolate(), regs);
}
void TraceExtension::Trace(const v8::FunctionCallbackInfo<v8::Value>& args) {
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) {
DoTraceHideCEntryFPAddress(GetFP(args));
}
Address TraceExtension::GetJsEntrySp() {
CHECK_NE(NULL, CcTest::i_isolate()->thread_local_top());
return CcTest::i_isolate()->js_entry_sp();
}
void TraceExtension::JSEntrySP(
const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_NE(0, GetJsEntrySp());
}
void TraceExtension::JSEntrySPLevel2(
const v8::FunctionCallbackInfo<v8::Value>& 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());
}
} } // namespace v8::internal