-// Copyright 2006-2009 the V8 project authors. All rights reserved.
+// Copyright 2010 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.
//
// Tests of profiler-related functions from log.h
Address TraceExtension::GetFP(const v8::Arguments& args) {
- CHECK_EQ(1, args.Length());
- // CodeGenerator::GenerateGetFramePointer pushes EBP / RBP value
- // on stack. In 64-bit mode we can't use Smi operations code because
- // they check that value is within Smi bounds.
+ // 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;
}
}
-namespace v8 {
-namespace internal {
-
-class CodeGeneratorPatcher {
- public:
- CodeGeneratorPatcher() {
- CodeGenerator::InlineRuntimeLUT gen_get_frame_pointer =
- {&CodeGenerator::GenerateGetFramePointer, "_GetFramePointer", 0};
- // _RandomHeapNumber is just used as a dummy function that has zero
- // arguments, the same as the _GetFramePointer function we actually patch
- // in.
- bool result = CodeGenerator::PatchInlineRuntimeEntry(
- NewString("_RandomHeapNumber"),
- gen_get_frame_pointer, &old_inline_entry);
- CHECK(result);
- }
-
- ~CodeGeneratorPatcher() {
- CHECK(CodeGenerator::PatchInlineRuntimeEntry(
- NewString("_GetFramePointer"),
- old_inline_entry, NULL));
- }
+// This C++ function is called as a constructor, to grab the frame pointer
+// from the calling function. When this function runs, the stack contains
+// a C_Entry frame and a Construct frame above the calling function's frame.
+static v8::Handle<Value> construct_call(const v8::Arguments& args) {
+ i::StackFrameIterator frame_iterator;
+ CHECK(frame_iterator.frame()->is_exit());
+ frame_iterator.Advance();
+ CHECK(frame_iterator.frame()->is_construct());
+ frame_iterator.Advance();
+ i::StackFrame* calling_frame = frame_iterator.frame();
+ CHECK(calling_frame->is_java_script());
+
+#if defined(V8_HOST_ARCH_32_BIT)
+ int32_t low_bits = reinterpret_cast<intptr_t>(calling_frame->fp());
+ args.This()->Set(v8_str("low_bits"), v8_num(low_bits >> 1));
+#elif defined(V8_HOST_ARCH_64_BIT)
+ int32_t low_bits = reinterpret_cast<uintptr_t>(calling_frame->fp());
+ int32_t high_bits = reinterpret_cast<uintptr_t>(calling_frame->fp()) >> 32;
+ args.This()->Set(v8_str("low_bits"), v8_num(low_bits));
+ args.This()->Set(v8_str("high_bits"), v8_num(high_bits));
+#else
+#error Host architecture is neither 32-bit nor 64-bit.
+#endif
+ return args.This();
+}
- private:
- CodeGenerator::InlineRuntimeLUT old_inline_entry;
-};
-} } // namespace v8::internal
+// Use the API to create a JSFunction object that calls the above C++ function.
+void CreateFramePointerGrabberConstructor(const char* constructor_name) {
+ Local<v8::FunctionTemplate> constructor_template =
+ v8::FunctionTemplate::New(construct_call);
+ constructor_template->SetClassName(v8_str("FPGrabber"));
+ Local<Function> fun = constructor_template->GetFunction();
+ env->Global()->Set(v8_str(constructor_name), fun);
+}
// 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.
+// encoded as one or two Smis.
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);
+ i::OS::SNPrintF(trace_call_buf,
+ "fp = new FPGrabber(); %s(fp.low_bits, fp.high_bits);",
+ trace_func_name);
+
+ // Create the FPGrabber function, which grabs the caller's frame pointer
+ // when called as a constructor.
+ CreateFramePointerGrabberConstructor("FPGrabber");
// 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;
func->shared()->set_name(*NewString(func_name));
#ifdef DEBUG
// StackTracer uses Top::c_entry_fp as a starting point for stack
// walking.
TEST(CFromJSStackTrace) {
- // TODO(711): The hack of replacing the inline runtime function
- // RandomHeapNumber with GetFrameNumber does not work with the way
- // the full compiler generates inline runtime calls.
- i::FLAG_full_compiler = false;
- i::FLAG_always_full_compiler = false;
-
TickSample sample;
InitTraceEnv(&sample);
// Top::c_entry_fp value. In this case, StackTracer uses passed frame
// pointer value as a starting point for stack walking.
TEST(PureJSStackTrace) {
- // TODO(711): The hack of replacing the inline runtime function
- // RandomHeapNumber with GetFrameNumber does not work with the way
- // the full compiler generates inline runtime calls.
- i::FLAG_full_compiler = false;
- i::FLAG_always_full_compiler = false;
-
TickSample sample;
InitTraceEnv(&sample);
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