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// Copyright (c) 2010 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.
//
// Unit tests for PreamblePatcher
#include "ceee/testing/sidestep/integration.h"
#include "ceee/testing/sidestep/preamble_patcher.h"
#include "ceee/testing/sidestep/mini_disassembler.h"
#pragma warning(push)
#pragma warning(disable:4553)
#include "ceee/testing/sidestep/auto_testing_hook.h"
#pragma warning(pop)
// Turning off all optimizations for this file, since the official build's
// "Whole program optimization" seems to cause the TestPatchUsingDynamicStub
// test to crash with an access violation. We debugged this and found
// that the optimized access a register that is changed by a call to the hook
// function.
#pragma optimize("", off)
namespace {
// Function for testing - this is what we patch
//
// NOTE: Because of the way the compiler optimizes this function in
// release builds, we need to use a different input value every time we
// call it within a function, otherwise the compiler will just reuse the
// last calculated incremented value.
int __declspec(noinline) IncrementNumber(int i) {
return i + 1;
}
// A function that is too short to patch
int __declspec(naked) TooShortFunction(int) {
__asm {
ret
}
}
typedef int (*IncrementingFunc)(int);
IncrementingFunc original_function = NULL;
int HookIncrementNumber(int i) {
SIDESTEP_ASSERT(original_function != NULL);
int incremented_once = original_function(i);
return incremented_once + 1;
}
// For the AutoTestingHook test, we can't use original_function, because
// all that is encapsulated.
// This function "increments" by 10, just to set it apart from the other
// functions.
int __declspec(noinline) AutoHookIncrementNumber(int i) {
return i + 10;
}
}; // namespace
namespace sidestep {
bool TestPatchUsingDynamicStub() {
original_function = NULL;
SIDESTEP_EXPECT_TRUE(IncrementNumber(1) == 2);
SIDESTEP_EXPECT_TRUE(sidestep::SIDESTEP_SUCCESS ==
sidestep::PreamblePatcher::Patch(IncrementNumber,
HookIncrementNumber,
&original_function));
SIDESTEP_EXPECT_TRUE(original_function);
SIDESTEP_EXPECT_TRUE(IncrementNumber(2) == 4);
SIDESTEP_EXPECT_TRUE(original_function(3) == 4);
// Clearbox test to see that the function has been patched.
sidestep::MiniDisassembler disassembler;
unsigned int instruction_size = 0;
SIDESTEP_EXPECT_TRUE(sidestep::IT_JUMP == disassembler.Disassemble(
reinterpret_cast<unsigned char*>(IncrementNumber),
instruction_size));
// Since we patched IncrementNumber, its first statement is a
// jmp to the hook function. So verify that we now can not patch
// IncrementNumber because it starts with a jump.
#if 0
IncrementingFunc dummy = NULL;
// TODO(joi@chromium.org): restore this test once flag is added to
// disable JMP following
SIDESTEP_EXPECT_TRUE(sidestep::SIDESTEP_JUMP_INSTRUCTION ==
sidestep::PreamblePatcher::Patch(IncrementNumber,
HookIncrementNumber,
&dummy));
// This test disabled because code in preamble_patcher_with_stub.cc
// asserts before returning the error code -- so there is no way
// to get an error code here, in debug build.
dummy = NULL;
SIDESTEP_EXPECT_TRUE(sidestep::SIDESTEP_FUNCTION_TOO_SMALL ==
sidestep::PreamblePatcher::Patch(TooShortFunction,
HookIncrementNumber,
&dummy));
#endif
SIDESTEP_EXPECT_TRUE(sidestep::SIDESTEP_SUCCESS ==
sidestep::PreamblePatcher::Unpatch(IncrementNumber,
HookIncrementNumber,
original_function));
return true;
}
bool PatchThenUnpatch() {
original_function = NULL;
SIDESTEP_EXPECT_TRUE(sidestep::SIDESTEP_SUCCESS ==
sidestep::PreamblePatcher::Patch(IncrementNumber,
HookIncrementNumber,
&original_function));
SIDESTEP_EXPECT_TRUE(original_function);
SIDESTEP_EXPECT_TRUE(IncrementNumber(1) == 3);
SIDESTEP_EXPECT_TRUE(original_function(2) == 3);
SIDESTEP_EXPECT_TRUE(sidestep::SIDESTEP_SUCCESS ==
sidestep::PreamblePatcher::Unpatch(IncrementNumber,
HookIncrementNumber,
original_function));
original_function = NULL;
SIDESTEP_EXPECT_TRUE(IncrementNumber(3) == 4);
return true;
}
bool AutoTestingHookTest() {
SIDESTEP_EXPECT_TRUE(IncrementNumber(1) == 2);
// Inner scope, so we can test what happens when the AutoTestingHook
// goes out of scope
{
AutoTestingHook hook = MakeTestingHook(IncrementNumber,
AutoHookIncrementNumber);
(void) hook;
SIDESTEP_EXPECT_TRUE(IncrementNumber(2) == 12);
}
SIDESTEP_EXPECT_TRUE(IncrementNumber(3) == 4);
return true;
}
bool AutoTestingHookInContainerTest() {
SIDESTEP_EXPECT_TRUE(IncrementNumber(1) == 2);
// Inner scope, so we can test what happens when the AutoTestingHook
// goes out of scope
{
AutoTestingHookHolder hook(MakeTestingHookHolder(IncrementNumber,
AutoHookIncrementNumber));
(void) hook;
SIDESTEP_EXPECT_TRUE(IncrementNumber(2) == 12);
}
SIDESTEP_EXPECT_TRUE(IncrementNumber(3) == 4);
return true;
}
bool UnitTests() {
return TestPatchUsingDynamicStub() && PatchThenUnpatch() &&
AutoTestingHookTest() && AutoTestingHookInContainerTest();
}
}; // namespace sidestep
#pragma optimize("", on)
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