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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stddef.h>
#include <iterator>
#include "base/memory/ref_counted.h"
#include "base/trace_event/heap_profiler_allocation_context.h"
#include "base/trace_event/heap_profiler_allocation_context_tracker.h"
#include "base/trace_event/trace_event.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace trace_event {
// Define all strings once, because the pseudo stack requires pointer equality,
// and string interning is unreliable.
const char kCupcake[] = "Cupcake";
const char kDonut[] = "Donut";
const char kEclair[] = "Eclair";
const char kFroyo[] = "Froyo";
const char kGingerbread[] = "Gingerbread";
// Asserts that the fixed-size array |expected_backtrace| matches the backtrace
// in |AllocationContextTracker::GetContextSnapshot|.
template <size_t N>
void AssertBacktraceEquals(const StackFrame(&expected_backtrace)[N]) {
AllocationContext ctx =
AllocationContextTracker::GetInstanceForCurrentThread()
->GetContextSnapshot();
auto actual = std::begin(ctx.backtrace.frames);
auto actual_bottom = std::end(ctx.backtrace.frames);
auto expected = std::begin(expected_backtrace);
auto expected_bottom = std::end(expected_backtrace);
// Note that this requires the pointers to be equal, this is not doing a deep
// string comparison.
for (; actual != actual_bottom && expected != expected_bottom;
actual++, expected++)
ASSERT_EQ(*expected, *actual);
// Ensure that the height of the stacks is the same.
ASSERT_EQ(actual, actual_bottom);
ASSERT_EQ(expected, expected_bottom);
}
void AssertBacktraceEmpty() {
AllocationContext ctx =
AllocationContextTracker::GetInstanceForCurrentThread()
->GetContextSnapshot();
for (StackFrame frame : ctx.backtrace.frames)
ASSERT_EQ(nullptr, frame);
}
class AllocationContextTrackerTest : public testing::Test {
public:
void SetUp() override {
TraceConfig config("");
TraceLog::GetInstance()->SetEnabled(config, TraceLog::RECORDING_MODE);
AllocationContextTracker::SetCaptureEnabled(true);
}
void TearDown() override {
AllocationContextTracker::SetCaptureEnabled(false);
TraceLog::GetInstance()->SetDisabled();
}
};
// Check that |TRACE_EVENT| macros push and pop to the pseudo stack correctly.
// Also check that |GetContextSnapshot| fills the backtrace with null pointers
// when the pseudo stack height is less than the capacity.
TEST_F(AllocationContextTrackerTest, PseudoStackScopedTrace) {
StackFrame c = kCupcake;
StackFrame d = kDonut;
StackFrame e = kEclair;
StackFrame f = kFroyo;
AssertBacktraceEmpty();
{
TRACE_EVENT0("Testing", kCupcake);
StackFrame frame_c[] = {c, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
AssertBacktraceEquals(frame_c);
{
TRACE_EVENT0("Testing", kDonut);
StackFrame frame_cd[] = {c, d, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
AssertBacktraceEquals(frame_cd);
}
AssertBacktraceEquals(frame_c);
{
TRACE_EVENT0("Testing", kEclair);
StackFrame frame_ce[] = {c, e, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
AssertBacktraceEquals(frame_ce);
}
AssertBacktraceEquals(frame_c);
}
AssertBacktraceEmpty();
{
TRACE_EVENT0("Testing", kFroyo);
StackFrame frame_f[] = {f, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
AssertBacktraceEquals(frame_f);
}
AssertBacktraceEmpty();
}
// Same as |PseudoStackScopedTrace|, but now test the |TRACE_EVENT_BEGIN| and
// |TRACE_EVENT_END| macros.
TEST_F(AllocationContextTrackerTest, PseudoStackBeginEndTrace) {
StackFrame c = kCupcake;
StackFrame d = kDonut;
StackFrame e = kEclair;
StackFrame f = kFroyo;
StackFrame frame_c[] = {c, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
StackFrame frame_cd[] = {c, d, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
StackFrame frame_ce[] = {c, e, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
StackFrame frame_f[] = {f, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
AssertBacktraceEmpty();
TRACE_EVENT_BEGIN0("Testing", kCupcake);
AssertBacktraceEquals(frame_c);
TRACE_EVENT_BEGIN0("Testing", kDonut);
AssertBacktraceEquals(frame_cd);
TRACE_EVENT_END0("Testing", kDonut);
AssertBacktraceEquals(frame_c);
TRACE_EVENT_BEGIN0("Testing", kEclair);
AssertBacktraceEquals(frame_ce);
TRACE_EVENT_END0("Testing", kEclair);
AssertBacktraceEquals(frame_c);
TRACE_EVENT_END0("Testing", kCupcake);
AssertBacktraceEmpty();
TRACE_EVENT_BEGIN0("Testing", kFroyo);
AssertBacktraceEquals(frame_f);
TRACE_EVENT_END0("Testing", kFroyo);
AssertBacktraceEmpty();
}
TEST_F(AllocationContextTrackerTest, PseudoStackMixedTrace) {
StackFrame c = kCupcake;
StackFrame d = kDonut;
StackFrame e = kEclair;
StackFrame f = kFroyo;
StackFrame frame_c[] = {c, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
StackFrame frame_cd[] = {c, d, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
StackFrame frame_e[] = {e, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
StackFrame frame_ef[] = {e, f, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
AssertBacktraceEmpty();
TRACE_EVENT_BEGIN0("Testing", kCupcake);
AssertBacktraceEquals(frame_c);
{
TRACE_EVENT0("Testing", kDonut);
AssertBacktraceEquals(frame_cd);
}
AssertBacktraceEquals(frame_c);
TRACE_EVENT_END0("Testing", kCupcake);
AssertBacktraceEmpty();
{
TRACE_EVENT0("Testing", kEclair);
AssertBacktraceEquals(frame_e);
TRACE_EVENT_BEGIN0("Testing", kFroyo);
AssertBacktraceEquals(frame_ef);
TRACE_EVENT_END0("Testing", kFroyo);
AssertBacktraceEquals(frame_e);
}
AssertBacktraceEmpty();
}
TEST_F(AllocationContextTrackerTest, BacktraceTakesTop) {
// Push 12 events onto the pseudo stack.
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kCupcake);
TRACE_EVENT0("Testing", kDonut);
TRACE_EVENT0("Testing", kEclair);
TRACE_EVENT0("Testing", kFroyo);
{
TRACE_EVENT0("Testing", kGingerbread);
AllocationContext ctx =
AllocationContextTracker::GetInstanceForCurrentThread()
->GetContextSnapshot();
// The pseudo stack relies on pointer equality, not deep string comparisons.
ASSERT_EQ(kCupcake, ctx.backtrace.frames[0]);
ASSERT_EQ(kFroyo, ctx.backtrace.frames[11]);
}
{
AllocationContext ctx =
AllocationContextTracker::GetInstanceForCurrentThread()
->GetContextSnapshot();
ASSERT_EQ(kCupcake, ctx.backtrace.frames[0]);
ASSERT_EQ(kFroyo, ctx.backtrace.frames[11]);
}
}
} // namespace trace_event
} // namespace base
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