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// Copyright 2006-2009 the V8 project authors. All rights reserved.
//
// Tests of profiler-related functions from log.h
#ifdef ENABLE_LOGGING_AND_PROFILING
#include <stdlib.h>
#include "v8.h"
#include "codegen.h"
#include "log.h"
#include "top.h"
#include "cctest.h"
#include "disassembler.h"
#include "register-allocator-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::JSFunction;
using v8::internal::StackTracer;
using v8::internal::TickSample;
using v8::internal::Top;
namespace i = v8::internal;
static v8::Persistent<v8::Context> env;
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 = reinterpret_cast<uintptr_t>(fp);
// sp is only used to define stack high bound
trace_env.sample->sp =
reinterpret_cast<unsigned int>(trace_env.sample) - 10240;
StackTracer::Trace(trace_env.sample);
}
// 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 = *(Top::c_entry_fp_address());
CHECK(saved_c_frame_fp);
*(Top::c_entry_fp_address()) = 0;
DoTrace(fp);
*(Top::c_entry_fp_address()) = saved_c_frame_fp;
}
static void CheckRetAddrIsInFunction(const char* func_name,
Address ret_addr,
Address func_start_addr,
unsigned int func_len) {
printf("CheckRetAddrIsInFunction \"%s\": %p %p %p\n",
func_name, func_start_addr, ret_addr, func_start_addr + func_len);
CHECK_GE(ret_addr, func_start_addr);
CHECK_GE(func_start_addr + func_len, ret_addr);
}
static void CheckRetAddrIsInJSFunction(const char* func_name,
Address ret_addr,
Handle<JSFunction> func) {
v8::internal::Code* func_code = func->code();
CheckRetAddrIsInFunction(
func_name, ret_addr,
func_code->instruction_start(),
func_code->ExecutableSize());
}
// --- 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) {
CHECK_EQ(1, args.Length());
Address fp = reinterpret_cast<Address>(args[0]->Int32Value() << 2);
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, Top::GetCurrentThread());
return Top::js_entry_sp(Top::GetCurrentThread());
}
v8::Handle<v8::Value> TraceExtension::JSEntrySP(const v8::Arguments& args) {
CHECK_NE(0, GetJsEntrySp());
return v8::Undefined();
}
static void CompileRun(const char* source) {
Script::Compile(String::New(source))->Run();
}
v8::Handle<v8::Value> TraceExtension::JSEntrySPLevel2(
const v8::Arguments& args) {
v8::HandleScope scope;
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 void InitializeVM() {
if (env.IsEmpty()) {
v8::HandleScope scope;
const char* extensions[] = { "v8/trace" };
v8::ExtensionConfiguration config(1, extensions);
env = v8::Context::New(&config);
}
v8::HandleScope scope;
env->Enter();
}
static Handle<JSFunction> CompileFunction(const char* source) {
return v8::Utils::OpenHandle(*Script::Compile(String::New(source)));
}
static Local<Value> GetGlobalProperty(const char* name) {
return env->Global()->Get(String::New(name));
}
static Handle<JSFunction> GetGlobalJSFunction(const char* name) {
Handle<JSFunction> js_func(JSFunction::cast(
*(v8::Utils::OpenHandle(
*GetGlobalProperty(name)))));
return js_func;
}
static void CheckRetAddrIsInJSFunction(const char* func_name,
Address ret_addr) {
CheckRetAddrIsInJSFunction(func_name, ret_addr,
GetGlobalJSFunction(func_name));
}
static void SetGlobalProperty(const char* name, Local<Value> value) {
env->Global()->Set(String::New(name), value);
}
static Handle<v8::internal::String> NewString(const char* s) {
return i::Factory::NewStringFromAscii(i::CStrVector(s));
}
namespace v8 {
namespace internal {
class CodeGeneratorPatcher {
public:
CodeGeneratorPatcher() {
CodeGenerator::InlineRuntimeLUT genGetFramePointer =
{&CodeGenerator::GenerateGetFramePointer, "_GetFramePointer"};
// _FastCharCodeAt is not used in our tests.
bool result = CodeGenerator::PatchInlineRuntimeEntry(
NewString("_FastCharCodeAt"),
genGetFramePointer, &oldInlineEntry);
CHECK(result);
}
~CodeGeneratorPatcher() {
CHECK(CodeGenerator::PatchInlineRuntimeEntry(
NewString("_GetFramePointer"),
oldInlineEntry, NULL));
}
private:
CodeGenerator::InlineRuntimeLUT oldInlineEntry;
};
} } // namespace v8::internal
// Creates a global function named 'func_name' that calls the tracing
// function 'trace_func_name' with an actual EBP register value,
// shifted right to be presented as Smi.
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, "%s(%%_GetFramePointer());", trace_func_name);
// Compile the script.
i::CodeGeneratorPatcher patcher;
bool allow_natives_syntax = i::FLAG_allow_natives_syntax;
i::FLAG_allow_natives_syntax = true;
Handle<JSFunction> func = CompileFunction(trace_call_buf.start());
CHECK(!func.is_null());
i::FLAG_allow_natives_syntax = allow_natives_syntax;
#ifdef DEBUG
v8::internal::Code* func_code = func->code();
CHECK(func_code->IsCode());
func_code->Print();
#endif
SetGlobalProperty(func_name, v8::ToApi<Value>(func));
}
TEST(CFromJSStackTrace) {
TickSample sample;
InitTraceEnv(&sample);
InitializeVM();
v8::HandleScope scope;
CreateTraceCallerFunction("JSFuncDoTrace", "trace");
CompileRun(
"function JSTrace() {"
" JSFuncDoTrace();"
"};\n"
"JSTrace();");
CHECK_GT(sample.frames_count, 1);
// Stack sampling will start from the first JS function, i.e. "JSFuncDoTrace"
CheckRetAddrIsInJSFunction("JSFuncDoTrace",
sample.stack[0]);
CheckRetAddrIsInJSFunction("JSTrace",
sample.stack[1]);
}
TEST(PureJSStackTrace) {
TickSample sample;
InitTraceEnv(&sample);
InitializeVM();
v8::HandleScope scope;
CreateTraceCallerFunction("JSFuncDoTrace", "js_trace");
CompileRun(
"function JSTrace() {"
" JSFuncDoTrace();"
"};\n"
"function OuterJSTrace() {"
" JSTrace();"
"};\n"
"OuterJSTrace();");
CHECK_GT(sample.frames_count, 1);
// Stack sampling will start from the caller of JSFuncDoTrace, i.e. "JSTrace"
CheckRetAddrIsInJSFunction("JSTrace",
sample.stack[0]);
CheckRetAddrIsInJSFunction("OuterJSTrace",
sample.stack[1]);
}
static void CFuncDoTrace() {
Address fp;
#ifdef __GNUC__
fp = reinterpret_cast<Address>(__builtin_frame_address(0));
#elif defined _MSC_VER
__asm mov [fp], ebp // NOLINT
#endif
DoTrace(fp);
}
static int CFunc(int depth) {
if (depth <= 0) {
CFuncDoTrace();
return 0;
} else {
return CFunc(depth - 1) + 1;
}
}
TEST(PureCStackTrace) {
TickSample sample;
InitTraceEnv(&sample);
// Check that sampler doesn't crash
CHECK_EQ(10, CFunc(10));
}
TEST(JsEntrySp) {
InitializeVM();
v8::HandleScope scope;
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());
}
#endif // ENABLE_LOGGING_AND_PROFILING
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