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286 lines
10 KiB
286 lines
10 KiB
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Tests of profiler-related functions from log.h
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#include <stdlib.h>
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#include "v8.h"
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#include "api.h"
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#include "cctest.h"
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#include "codegen.h"
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#include "disassembler.h"
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#include "isolate.h"
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#include "log.h"
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#include "sampler.h"
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#include "trace-extension.h"
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#include "vm-state-inl.h"
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using v8::Function;
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using v8::Local;
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using v8::Object;
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using v8::Script;
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using v8::String;
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using v8::Value;
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using v8::internal::byte;
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using v8::internal::Address;
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using v8::internal::Handle;
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using v8::internal::Isolate;
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using v8::internal::JSFunction;
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using v8::internal::TickSample;
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static bool IsAddressWithinFuncCode(JSFunction* function, Address addr) {
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i::Code* code = function->code();
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return code->contains(addr);
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}
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static bool IsAddressWithinFuncCode(v8::Local<v8::Context> context,
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const char* func_name,
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Address addr) {
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v8::Local<v8::Value> func = context->Global()->Get(v8_str(func_name));
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CHECK(func->IsFunction());
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JSFunction* js_func = JSFunction::cast(*v8::Utils::OpenHandle(*func));
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return IsAddressWithinFuncCode(js_func, addr);
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}
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// This C++ function is called as a constructor, to grab the frame pointer
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// from the calling function. When this function runs, the stack contains
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// a C_Entry frame and a Construct frame above the calling function's frame.
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static void construct_call(const v8::FunctionCallbackInfo<v8::Value>& args) {
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i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
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i::StackFrameIterator frame_iterator(isolate);
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CHECK(frame_iterator.frame()->is_exit());
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frame_iterator.Advance();
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CHECK(frame_iterator.frame()->is_construct());
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frame_iterator.Advance();
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i::StackFrame* calling_frame = frame_iterator.frame();
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CHECK(calling_frame->is_java_script());
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#if defined(V8_HOST_ARCH_32_BIT)
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int32_t low_bits = reinterpret_cast<int32_t>(calling_frame->fp());
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args.This()->Set(v8_str("low_bits"), v8_num(low_bits >> 1));
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#elif defined(V8_HOST_ARCH_64_BIT)
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uint64_t fp = reinterpret_cast<uint64_t>(calling_frame->fp());
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int32_t low_bits = static_cast<int32_t>(fp & 0xffffffff);
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int32_t high_bits = static_cast<int32_t>(fp >> 32);
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args.This()->Set(v8_str("low_bits"), v8_num(low_bits));
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args.This()->Set(v8_str("high_bits"), v8_num(high_bits));
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#else
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#error Host architecture is neither 32-bit nor 64-bit.
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#endif
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args.GetReturnValue().Set(args.This());
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}
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// Use the API to create a JSFunction object that calls the above C++ function.
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void CreateFramePointerGrabberConstructor(v8::Local<v8::Context> context,
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const char* constructor_name) {
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Local<v8::FunctionTemplate> constructor_template =
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v8::FunctionTemplate::New(context->GetIsolate(), construct_call);
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constructor_template->SetClassName(v8_str("FPGrabber"));
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Local<Function> fun = constructor_template->GetFunction();
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context->Global()->Set(v8_str(constructor_name), fun);
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}
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// Creates a global function named 'func_name' that calls the tracing
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// function 'trace_func_name' with an actual EBP register value,
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// encoded as one or two Smis.
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static void CreateTraceCallerFunction(v8::Local<v8::Context> context,
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const char* func_name,
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const char* trace_func_name) {
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i::EmbeddedVector<char, 256> trace_call_buf;
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i::OS::SNPrintF(trace_call_buf,
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"function %s() {"
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" fp = new FPGrabber();"
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" %s(fp.low_bits, fp.high_bits);"
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"}",
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func_name, trace_func_name);
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// Create the FPGrabber function, which grabs the caller's frame pointer
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// when called as a constructor.
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CreateFramePointerGrabberConstructor(context, "FPGrabber");
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// Compile the script.
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CompileRun(trace_call_buf.start());
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}
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// This test verifies that stack tracing works when called during
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// execution of a native function called from JS code. In this case,
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// TickSample::Trace uses Isolate::c_entry_fp as a starting point for stack
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// walking.
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TEST(CFromJSStackTrace) {
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// BUG(1303) Inlining of JSFuncDoTrace() in JSTrace below breaks this test.
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i::FLAG_use_inlining = false;
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TickSample sample;
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i::TraceExtension::InitTraceEnv(&sample);
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v8::HandleScope scope(CcTest::isolate());
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v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
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v8::Context::Scope context_scope(context);
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// Create global function JSFuncDoTrace which calls
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// extension function trace() with the current frame pointer value.
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CreateTraceCallerFunction(context, "JSFuncDoTrace", "trace");
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Local<Value> result = CompileRun(
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"function JSTrace() {"
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" JSFuncDoTrace();"
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"};\n"
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"JSTrace();\n"
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"true;");
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CHECK(!result.IsEmpty());
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// When stack tracer is invoked, the stack should look as follows:
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// script [JS]
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// JSTrace() [JS]
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// JSFuncDoTrace() [JS] [captures EBP value and encodes it as Smi]
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// trace(EBP) [native (extension)]
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// DoTrace(EBP) [native]
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// TickSample::Trace
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CHECK(sample.has_external_callback);
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CHECK_EQ(FUNCTION_ADDR(i::TraceExtension::Trace), sample.external_callback);
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// Stack tracing will start from the first JS function, i.e. "JSFuncDoTrace"
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int base = 0;
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CHECK_GT(sample.frames_count, base + 1);
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CHECK(IsAddressWithinFuncCode(
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context, "JSFuncDoTrace", sample.stack[base + 0]));
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CHECK(IsAddressWithinFuncCode(context, "JSTrace", sample.stack[base + 1]));
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}
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// This test verifies that stack tracing works when called during
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// execution of JS code. However, as calling TickSample::Trace requires
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// entering native code, we can only emulate pure JS by erasing
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// Isolate::c_entry_fp value. In this case, TickSample::Trace uses passed frame
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// pointer value as a starting point for stack walking.
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TEST(PureJSStackTrace) {
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// This test does not pass with inlining enabled since inlined functions
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// don't appear in the stack trace.
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i::FLAG_use_inlining = false;
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TickSample sample;
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i::TraceExtension::InitTraceEnv(&sample);
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v8::HandleScope scope(CcTest::isolate());
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v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
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v8::Context::Scope context_scope(context);
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// Create global function JSFuncDoTrace which calls
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// extension function js_trace() with the current frame pointer value.
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CreateTraceCallerFunction(context, "JSFuncDoTrace", "js_trace");
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Local<Value> result = CompileRun(
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"function JSTrace() {"
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" JSFuncDoTrace();"
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"};\n"
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"function OuterJSTrace() {"
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" JSTrace();"
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"};\n"
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"OuterJSTrace();\n"
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"true;");
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CHECK(!result.IsEmpty());
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// When stack tracer is invoked, the stack should look as follows:
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// script [JS]
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// OuterJSTrace() [JS]
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// JSTrace() [JS]
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// JSFuncDoTrace() [JS]
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// js_trace(EBP) [native (extension)]
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// DoTraceHideCEntryFPAddress(EBP) [native]
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// TickSample::Trace
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//
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CHECK(sample.has_external_callback);
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CHECK_EQ(FUNCTION_ADDR(i::TraceExtension::JSTrace), sample.external_callback);
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// Stack sampling will start from the caller of JSFuncDoTrace, i.e. "JSTrace"
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int base = 0;
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CHECK_GT(sample.frames_count, base + 1);
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CHECK(IsAddressWithinFuncCode(context, "JSTrace", sample.stack[base + 0]));
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CHECK(IsAddressWithinFuncCode(
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context, "OuterJSTrace", sample.stack[base + 1]));
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}
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static void CFuncDoTrace(byte dummy_parameter) {
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Address fp;
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#ifdef __GNUC__
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fp = reinterpret_cast<Address>(__builtin_frame_address(0));
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#elif defined _MSC_VER
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// Approximate a frame pointer address. We compile without base pointers,
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// so we can't trust ebp/rbp.
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fp = &dummy_parameter - 2 * sizeof(void*); // NOLINT
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#else
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#error Unexpected platform.
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#endif
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i::TraceExtension::DoTrace(fp);
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}
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static int CFunc(int depth) {
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if (depth <= 0) {
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CFuncDoTrace(0);
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return 0;
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} else {
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return CFunc(depth - 1) + 1;
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}
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}
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// This test verifies that stack tracing doesn't crash when called on
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// pure native code. TickSample::Trace only unrolls JS code, so we can't
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// get any meaningful info here.
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TEST(PureCStackTrace) {
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TickSample sample;
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i::TraceExtension::InitTraceEnv(&sample);
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v8::HandleScope scope(CcTest::isolate());
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v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
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v8::Context::Scope context_scope(context);
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// Check that sampler doesn't crash
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CHECK_EQ(10, CFunc(10));
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}
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TEST(JsEntrySp) {
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v8::HandleScope scope(CcTest::isolate());
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v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
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v8::Context::Scope context_scope(context);
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CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
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CompileRun("a = 1; b = a + 1;");
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CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
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CompileRun("js_entry_sp();");
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CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
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CompileRun("js_entry_sp_level2();");
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CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
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}
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