vendor/compiler-rt/compiler-rt-release_39-r276489

4 files changed, 821 insertions, 0 deletions

diff --git a/lib/interception/tests/CMakeLists.txt b/lib/interception/tests/CMakeLists.txt
new file mode 100644
index 0000000000000..bfe41fed2fed5
--- /dev/null
+++ b/lib/interception/tests/CMakeLists.txt
@@ -0,0 +1,142 @@
+include(CompilerRTCompile)
+
+filter_available_targets(INTERCEPTION_UNITTEST_SUPPORTED_ARCH x86_64 i386 mips64 mips64el)
+
+set(INTERCEPTION_UNITTESTS
+  interception_linux_test.cc
+  interception_test_main.cc
+  interception_win_test.cc
+)
+
+set(INTERCEPTION_TEST_HEADERS)
+
+set(INTERCEPTION_TEST_CFLAGS_COMMON
+  ${COMPILER_RT_UNITTEST_CFLAGS}
+  ${COMPILER_RT_GTEST_CFLAGS}
+  -I${COMPILER_RT_SOURCE_DIR}/include
+  -I${COMPILER_RT_SOURCE_DIR}/lib
+  -I${COMPILER_RT_SOURCE_DIR}/lib/interception
+  -fno-rtti
+  -O2
+  -Werror=sign-compare
+  -Wno-non-virtual-dtor)
+
+# -gline-tables-only must be enough for these tests, so use it if possible.
+if(COMPILER_RT_TEST_COMPILER_ID MATCHES "Clang")
+  list(APPEND INTERCEPTION_TEST_CFLAGS_COMMON -gline-tables-only)
+else()
+  list(APPEND INTERCEPTION_TEST_CFLAGS_COMMON -g)
+endif()
+if(MSVC)
+  list(APPEND INTERCEPTION_TEST_CFLAGS_COMMON -gcodeview)
+endif()
+list(APPEND INTERCEPTION_TEST_LINK_FLAGS_COMMON -g)
+
+if(NOT MSVC)
+  list(APPEND INTERCEPTION_TEST_LINK_FLAGS_COMMON --driver-mode=g++)
+endif()
+
+if(ANDROID)
+  list(APPEND INTERCEPTION_TEST_LINK_FLAGS_COMMON -pie)
+endif()
+
+set(INTERCEPTION_TEST_LINK_LIBS)
+append_list_if(COMPILER_RT_HAS_LIBLOG log INTERCEPTION_TEST_LINK_LIBS)
+# NDK r10 requires -latomic almost always.
+append_list_if(ANDROID atomic INTERCEPTION_TEST_LINK_LIBS)
+
+append_list_if(COMPILER_RT_HAS_LIBDL -ldl INTERCEPTION_TEST_LINK_FLAGS_COMMON)
+append_list_if(COMPILER_RT_HAS_LIBRT -lrt INTERCEPTION_TEST_LINK_FLAGS_COMMON)
+append_list_if(COMPILER_RT_HAS_LIBPTHREAD -pthread INTERCEPTION_TEST_LINK_FLAGS_COMMON)
+# x86_64 FreeBSD 9.2 additionally requires libc++ to build the tests. Also,
+# 'libm' shall be specified explicitly to build i386 tests.
+if(CMAKE_SYSTEM MATCHES "FreeBSD-9.2-RELEASE")
+  list(APPEND INTERCEPTION_TEST_LINK_FLAGS_COMMON "-lc++ -lm")
+endif()
+
+include_directories(..)
+include_directories(../..)
+
+# Adds static library which contains interception object file
+# (universal binary on Mac and arch-specific object files on Linux).
+macro(add_interceptor_lib library)
+  add_library(${library} STATIC ${ARGN})
+  set_target_properties(${library} PROPERTIES
+    ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    FOLDER "Compiler-RT Runtime tests")
+endmacro()
+
+function(get_interception_lib_for_arch arch lib lib_name)
+  if(APPLE)
+    set(tgt_name "RTInterception.test.osx")
+  else()
+    set(tgt_name "RTInterception.test.${arch}")
+  endif()
+  set(${lib} "${tgt_name}" PARENT_SCOPE)
+  if(CMAKE_CONFIGURATION_TYPES)
+   set(configuration_path "${CMAKE_CFG_INTDIR}/")
+  else()
+   set(configuration_path "")
+  endif()
+  if(NOT MSVC)
+    set(${lib_name} "${configuration_path}lib${tgt_name}.a" PARENT_SCOPE)
+  else()
+    set(${lib_name} "${configuration_path}${tgt_name}.lib" PARENT_SCOPE)
+  endif()
+endfunction()
+
+# Interception unit tests testsuite.
+add_custom_target(InterceptionUnitTests)
+set_target_properties(InterceptionUnitTests PROPERTIES
+  FOLDER "Compiler-RT Tests")
+
+# Adds interception tests for architecture.
+macro(add_interception_tests_for_arch arch)
+  get_target_flags_for_arch(${arch} TARGET_FLAGS)
+  set(INTERCEPTION_TEST_SOURCES ${INTERCEPTION_UNITTESTS}
+                             ${COMPILER_RT_GTEST_SOURCE})
+  set(INTERCEPTION_TEST_COMPILE_DEPS ${INTERCEPTION_TEST_HEADERS})
+  if(NOT COMPILER_RT_STANDALONE_BUILD)
+    list(APPEND INTERCEPTION_TEST_COMPILE_DEPS gtest)
+  endif()
+  set(INTERCEPTION_TEST_OBJECTS)
+  foreach(source ${INTERCEPTION_TEST_SOURCES})
+    get_filename_component(basename ${source} NAME)
+    if(CMAKE_CONFIGURATION_TYPES)
+      set(output_obj "${CMAKE_CFG_INTDIR}/${basename}.${arch}.o")
+    else()
+      set(output_obj "${basename}.${arch}.o")
+    endif()
+    clang_compile(${output_obj} ${source}
+                  CFLAGS ${INTERCEPTION_TEST_CFLAGS_COMMON} ${TARGET_FLAGS}
+                  DEPS ${INTERCEPTION_TEST_COMPILE_DEPS})
+    list(APPEND INTERCEPTION_TEST_OBJECTS ${output_obj})
+  endforeach()
+  get_interception_lib_for_arch(${arch} INTERCEPTION_COMMON_LIB
+                                INTERCEPTION_COMMON_LIB_NAME)
+  # Add unittest target.
+  set(INTERCEPTION_TEST_NAME "Interception-${arch}-Test")
+  add_compiler_rt_test(InterceptionUnitTests ${INTERCEPTION_TEST_NAME}
+                       OBJECTS ${INTERCEPTION_TEST_OBJECTS}
+                               ${INTERCEPTION_COMMON_LIB_NAME}
+                       DEPS ${INTERCEPTION_TEST_OBJECTS} ${INTERCEPTION_COMMON_LIB}
+                       LINK_FLAGS ${INTERCEPTION_TEST_LINK_FLAGS_COMMON}
+                                  ${TARGET_FLAGS})
+endmacro()
+
+if(COMPILER_RT_CAN_EXECUTE_TESTS AND NOT ANDROID AND NOT APPLE)
+  # We use just-built clang to build interception unittests, so we must
+  # be sure that produced binaries would work.
+  if(APPLE)
+    add_interceptor_lib("RTInterception.test.osx"
+                        $<TARGET_OBJECTS:RTInterception.osx>)
+  else()
+    foreach(arch ${INTERCEPTION_UNITTEST_SUPPORTED_ARCH})
+      add_interceptor_lib("RTInterception.test.${arch}"
+                          $<TARGET_OBJECTS:RTInterception.${arch}>)
+    endforeach()
+  endif()
+  foreach(arch ${INTERCEPTION_UNITTEST_SUPPORTED_ARCH})
+    add_interception_tests_for_arch(${arch})
+  endforeach()
+endif()
diff --git a/lib/interception/tests/interception_linux_test.cc b/lib/interception/tests/interception_linux_test.cc
new file mode 100644
index 0000000000000..4a1ae785d16f4
--- /dev/null
+++ b/lib/interception/tests/interception_linux_test.cc
@@ -0,0 +1,65 @@
+//===-- interception_linux_test.cc ----------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
+// Tests for interception_linux.h.
+//
+//===----------------------------------------------------------------------===//
+#include "interception/interception.h"
+
+#include "gtest/gtest.h"
+
+// Too slow for debug build
+#if !SANITIZER_DEBUG
+#if SANITIZER_LINUX
+
+static int InterceptorFunctionCalled;
+
+DECLARE_REAL(int, isdigit, int);
+
+INTERCEPTOR(int, isdigit, int d) {
+  ++InterceptorFunctionCalled;
+  return d >= '0' && d <= '9';
+}
+
+namespace __interception {
+
+TEST(Interception, GetRealFunctionAddress) {
+  uptr expected_malloc_address = (uptr)(void*)&malloc;
+  uptr malloc_address = 0;
+  EXPECT_TRUE(GetRealFunctionAddress("malloc", &malloc_address, 0, 0));
+  EXPECT_EQ(expected_malloc_address, malloc_address);
+
+  uptr dummy_address = 0;
+  EXPECT_TRUE(
+      GetRealFunctionAddress("dummy_doesnt_exist__", &dummy_address, 0, 0));
+  EXPECT_EQ(0U, dummy_address);
+}
+
+TEST(Interception, Basic) {
+  ASSERT_TRUE(INTERCEPT_FUNCTION(isdigit));
+
+  // After interception, the counter should be incremented.
+  InterceptorFunctionCalled = 0;
+  EXPECT_NE(0, isdigit('1'));
+  EXPECT_EQ(1, InterceptorFunctionCalled);
+  EXPECT_EQ(0, isdigit('a'));
+  EXPECT_EQ(2, InterceptorFunctionCalled);
+
+  // Calling the REAL function should not affect the counter.
+  InterceptorFunctionCalled = 0;
+  EXPECT_NE(0, REAL(isdigit)('1'));
+  EXPECT_EQ(0, REAL(isdigit)('a'));
+  EXPECT_EQ(0, InterceptorFunctionCalled);
+}
+
+}  // namespace __interception
+
+#endif  // SANITIZER_LINUX
+#endif  // #if !SANITIZER_DEBUG
diff --git a/lib/interception/tests/interception_test_main.cc b/lib/interception/tests/interception_test_main.cc
new file mode 100644
index 0000000000000..311da51ecfcec
--- /dev/null
+++ b/lib/interception/tests/interception_test_main.cc
@@ -0,0 +1,22 @@
+//===-- interception_test_main.cc------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Testing the machinery for providing replacements/wrappers for system
+// functions.
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+
+int main(int argc, char **argv) {
+  testing::GTEST_FLAG(death_test_style) = "threadsafe";
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}
diff --git a/lib/interception/tests/interception_win_test.cc b/lib/interception/tests/interception_win_test.cc
new file mode 100644
index 0000000000000..611354f03d12b
--- /dev/null
+++ b/lib/interception/tests/interception_win_test.cc
@@ -0,0 +1,592 @@
+//===-- interception_win_test.cc ------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
+// Tests for interception_win.h.
+//
+//===----------------------------------------------------------------------===//
+#include "interception/interception.h"
+
+#include "gtest/gtest.h"
+
+// Too slow for debug build
+#if !SANITIZER_DEBUG
+#if SANITIZER_WINDOWS
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+namespace __interception {
+namespace {
+
+enum FunctionPrefixKind {
+  FunctionPrefixNone,
+  FunctionPrefixPadding,
+  FunctionPrefixHotPatch,
+  FunctionPrefixDetour,
+};
+
+typedef bool (*TestOverrideFunction)(uptr, uptr, uptr*);
+typedef int (*IdentityFunction)(int);
+
+#if SANITIZER_WINDOWS64
+
+const u8 kIdentityCodeWithPrologue[] = {
+    0x55,                   // push        rbp
+    0x48, 0x89, 0xE5,       // mov         rbp,rsp
+    0x8B, 0xC1,             // mov         eax,ecx
+    0x5D,                   // pop         rbp
+    0xC3,                   // ret
+};
+
+const u8 kIdentityCodeWithPushPop[] = {
+    0x55,                   // push        rbp
+    0x48, 0x89, 0xE5,       // mov         rbp,rsp
+    0x53,                   // push        rbx
+    0x50,                   // push        rax
+    0x58,                   // pop         rax
+    0x8B, 0xC1,             // mov         rax,rcx
+    0x5B,                   // pop         rbx
+    0x5D,                   // pop         rbp
+    0xC3,                   // ret
+};
+
+const u8 kIdentityTwiceOffset = 16;
+const u8 kIdentityTwice[] = {
+    0x55,                   // push        rbp
+    0x48, 0x89, 0xE5,       // mov         rbp,rsp
+    0x8B, 0xC1,             // mov         eax,ecx
+    0x5D,                   // pop         rbp
+    0xC3,                   // ret
+    0x90, 0x90, 0x90, 0x90,
+    0x90, 0x90, 0x90, 0x90,
+    0x55,                   // push        rbp
+    0x48, 0x89, 0xE5,       // mov         rbp,rsp
+    0x8B, 0xC1,             // mov         eax,ecx
+    0x5D,                   // pop         rbp
+    0xC3,                   // ret
+};
+
+const u8 kIdentityCodeWithMov[] = {
+    0x89, 0xC8,             // mov         eax, ecx
+    0xC3,                   // ret
+};
+
+const u8 kIdentityCodeWithJump[] = {
+    0xE9, 0x04, 0x00, 0x00,
+    0x00,                   // jmp + 4
+    0xCC, 0xCC, 0xCC, 0xCC,
+    0x89, 0xC8,             // mov         eax, ecx
+    0xC3,                   // ret
+};
+
+#else
+
+const u8 kIdentityCodeWithPrologue[] = {
+    0x55,                   // push        ebp
+    0x8B, 0xEC,             // mov         ebp,esp
+    0x8B, 0x45, 0x08,       // mov         eax,dword ptr [ebp + 8]
+    0x5D,                   // pop         ebp
+    0xC3,                   // ret
+};
+
+const u8 kIdentityCodeWithPushPop[] = {
+    0x55,                   // push        ebp
+    0x8B, 0xEC,             // mov         ebp,esp
+    0x53,                   // push        ebx
+    0x50,                   // push        eax
+    0x58,                   // pop         eax
+    0x8B, 0x45, 0x08,       // mov         eax,dword ptr [ebp + 8]
+    0x5B,                   // pop         ebx
+    0x5D,                   // pop         ebp
+    0xC3,                   // ret
+};
+
+const u8 kIdentityTwiceOffset = 8;
+const u8 kIdentityTwice[] = {
+    0x55,                   // push        ebp
+    0x8B, 0xEC,             // mov         ebp,esp
+    0x8B, 0x45, 0x08,       // mov         eax,dword ptr [ebp + 8]
+    0x5D,                   // pop         ebp
+    0xC3,                   // ret
+    0x55,                   // push        ebp
+    0x8B, 0xEC,             // mov         ebp,esp
+    0x8B, 0x45, 0x08,       // mov         eax,dword ptr [ebp + 8]
+    0x5D,                   // pop         ebp
+    0xC3,                   // ret
+};
+
+const u8 kIdentityCodeWithMov[] = {
+    0x8B, 0x44, 0x24, 0x04, // mov         eax,dword ptr [esp + 4]
+    0xC3,                   // ret
+};
+
+const u8 kIdentityCodeWithJump[] = {
+    0xE9, 0x04, 0x00, 0x00,
+    0x00,                   // jmp + 4
+    0xCC, 0xCC, 0xCC, 0xCC,
+    0x8B, 0x44, 0x24, 0x04, // mov         eax,dword ptr [esp + 4]
+    0xC3,                   // ret
+};
+
+#endif
+
+const u8 kPatchableCode1[] = {
+    0xB8, 0x4B, 0x00, 0x00, 0x00,   // mov eax,4B
+    0x33, 0xC9,                     // xor ecx,ecx
+    0xC3,                           // ret
+};
+
+const u8 kPatchableCode2[] = {
+    0x55,                           // push ebp
+    0x8B, 0xEC,                     // mov ebp,esp
+    0x33, 0xC0,                     // xor eax,eax
+    0x5D,                           // pop ebp
+    0xC3,                           // ret
+};
+
+const u8 kPatchableCode3[] = {
+    0x55,                           // push ebp
+    0x8B, 0xEC,                     // mov ebp,esp
+    0x6A, 0x00,                     // push 0
+    0xE8, 0x3D, 0xFF, 0xFF, 0xFF,   // call <func>
+};
+
+const u8 kPatchableCode4[] = {
+    0xE9, 0xCC, 0xCC, 0xCC, 0xCC,   // jmp <label>
+    0x90, 0x90, 0x90, 0x90,
+};
+
+const u8 kUnpatchableCode1[] = {
+    0xC3,                           // ret
+};
+
+const u8 kUnpatchableCode2[] = {
+    0x33, 0xC9,                     // xor ecx,ecx
+    0xC3,                           // ret
+};
+
+const u8 kUnpatchableCode3[] = {
+    0x75, 0xCC,                     // jne <label>
+    0x33, 0xC9,                     // xor ecx,ecx
+    0xC3,                           // ret
+};
+
+const u8 kUnpatchableCode4[] = {
+    0x74, 0xCC,                     // jne <label>
+    0x33, 0xC9,                     // xor ecx,ecx
+    0xC3,                           // ret
+};
+
+const u8 kUnpatchableCode5[] = {
+    0xEB, 0x02,                     // jmp <label>
+    0x33, 0xC9,                     // xor ecx,ecx
+    0xC3,                           // ret
+};
+
+const u8 kUnpatchableCode6[] = {
+    0xE8, 0xCC, 0xCC, 0xCC, 0xCC,   // call <func>
+    0x90, 0x90, 0x90, 0x90,
+};
+
+// A buffer holding the dynamically generated code under test.
+u8* ActiveCode;
+size_t ActiveCodeLength = 4096;
+
+template<class T>
+static void LoadActiveCode(
+    const T &code,
+    uptr *entry_point,
+    FunctionPrefixKind prefix_kind = FunctionPrefixNone) {
+  if (ActiveCode == nullptr) {
+    ActiveCode =
+        (u8*)::VirtualAlloc(nullptr, ActiveCodeLength,
+                            MEM_COMMIT | MEM_RESERVE,
+                            PAGE_EXECUTE_READWRITE);
+    ASSERT_NE(ActiveCode, nullptr);
+  }
+
+  size_t position = 0;
+
+  // Add padding to avoid memory violation when scanning the prefix.
+  for (int i = 0; i < 16; ++i)
+    ActiveCode[position++] = 0xC3;  // Instruction 'ret'.
+
+  // Add function padding.
+  size_t padding = 0;
+  if (prefix_kind == FunctionPrefixPadding)
+    padding = 16;
+  else if (prefix_kind == FunctionPrefixDetour ||
+           prefix_kind == FunctionPrefixHotPatch)
+    padding = FIRST_32_SECOND_64(5, 6);
+  // Insert |padding| instructions 'nop'.
+  for (size_t i = 0; i < padding; ++i)
+    ActiveCode[position++] = 0x90;
+
+  // Keep track of the entry point.
+  *entry_point = (uptr)&ActiveCode[position];
+
+  // Add the detour instruction (i.e. mov edi, edi)
+  if (prefix_kind == FunctionPrefixDetour) {
+#if SANITIZER_WINDOWS64
+    // Note that "mov edi,edi" is NOP in 32-bit only, in 64-bit it clears
+    // higher bits of RDI.
+    // Use 66,90H as NOP for Windows64.
+    ActiveCode[position++] = 0x66;
+    ActiveCode[position++] = 0x90;
+#else
+    // mov edi,edi.
+    ActiveCode[position++] = 0x8B;
+    ActiveCode[position++] = 0xFF;
+#endif
+
+  }
+
+  // Copy the function body.
+  for (size_t i = 0; i < sizeof(T); ++i)
+    ActiveCode[position++] = code[i];
+}
+
+int InterceptorFunctionCalled;
+IdentityFunction InterceptedRealFunction;
+
+int InterceptorFunction(int x) {
+  ++InterceptorFunctionCalled;
+  return InterceptedRealFunction(x);
+}
+
+}  // namespace
+
+// Tests for interception_win.h
+TEST(Interception, InternalGetProcAddress) {
+  HMODULE ntdll_handle = ::GetModuleHandle("ntdll");
+  ASSERT_NE(nullptr, ntdll_handle);
+  uptr DbgPrint_expected = (uptr)::GetProcAddress(ntdll_handle, "DbgPrint");
+  uptr isdigit_expected = (uptr)::GetProcAddress(ntdll_handle, "isdigit");
+  uptr DbgPrint_adddress = InternalGetProcAddress(ntdll_handle, "DbgPrint");
+  uptr isdigit_address = InternalGetProcAddress(ntdll_handle, "isdigit");
+
+  EXPECT_EQ(DbgPrint_expected, DbgPrint_adddress);
+  EXPECT_EQ(isdigit_expected, isdigit_address);
+  EXPECT_NE(DbgPrint_adddress, isdigit_address);
+}
+
+template<class T>
+static void TestIdentityFunctionPatching(
+    const T &code,
+    TestOverrideFunction override,
+    FunctionPrefixKind prefix_kind = FunctionPrefixNone) {
+  uptr identity_address;
+  LoadActiveCode(code, &identity_address, prefix_kind);
+  IdentityFunction identity = (IdentityFunction)identity_address;
+
+  // Validate behavior before dynamic patching.
+  InterceptorFunctionCalled = 0;
+  EXPECT_EQ(0, identity(0));
+  EXPECT_EQ(42, identity(42));
+  EXPECT_EQ(0, InterceptorFunctionCalled);
+
+  // Patch the function.
+  uptr real_identity_address = 0;
+  bool success = override(identity_address,
+                         (uptr)&InterceptorFunction,
+                         &real_identity_address);
+  EXPECT_TRUE(success);
+  EXPECT_NE(0U, real_identity_address);
+  IdentityFunction real_identity = (IdentityFunction)real_identity_address;
+  InterceptedRealFunction = real_identity;
+
+  // Don't run tests if hooking failed or the real function is not valid.
+  if (!success || !real_identity_address)
+    return;
+
+  // Calling the redirected function.
+  InterceptorFunctionCalled = 0;
+  EXPECT_EQ(0, identity(0));
+  EXPECT_EQ(42, identity(42));
+  EXPECT_EQ(2, InterceptorFunctionCalled);
+
+  // Calling the real function.
+  InterceptorFunctionCalled = 0;
+  EXPECT_EQ(0, real_identity(0));
+  EXPECT_EQ(42, real_identity(42));
+  EXPECT_EQ(0, InterceptorFunctionCalled);
+
+  TestOnlyReleaseTrampolineRegions();
+}
+
+#if !SANITIZER_WINDOWS64
+TEST(Interception, OverrideFunctionWithDetour) {
+  TestOverrideFunction override = OverrideFunctionWithDetour;
+  FunctionPrefixKind prefix = FunctionPrefixDetour;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithMov, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithJump, override, prefix);
+}
+#endif  // !SANITIZER_WINDOWS64
+
+TEST(Interception, OverrideFunctionWithRedirectJump) {
+  TestOverrideFunction override = OverrideFunctionWithRedirectJump;
+  TestIdentityFunctionPatching(kIdentityCodeWithJump, override);
+}
+
+TEST(Interception, OverrideFunctionWithHotPatch) {
+  TestOverrideFunction override = OverrideFunctionWithHotPatch;
+  FunctionPrefixKind prefix = FunctionPrefixHotPatch;
+  TestIdentityFunctionPatching(kIdentityCodeWithMov, override, prefix);
+}
+
+TEST(Interception, OverrideFunctionWithTrampoline) {
+  TestOverrideFunction override = OverrideFunctionWithTrampoline;
+  FunctionPrefixKind prefix = FunctionPrefixNone;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+
+  prefix = FunctionPrefixPadding;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+}
+
+TEST(Interception, OverrideFunction) {
+  TestOverrideFunction override = OverrideFunction;
+  FunctionPrefixKind prefix = FunctionPrefixNone;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithJump, override, prefix);
+
+  prefix = FunctionPrefixPadding;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithMov, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithJump, override, prefix);
+
+  prefix = FunctionPrefixHotPatch;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithMov, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithJump, override, prefix);
+
+  prefix = FunctionPrefixDetour;
+  TestIdentityFunctionPatching(kIdentityCodeWithPrologue, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithPushPop, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithMov, override, prefix);
+  TestIdentityFunctionPatching(kIdentityCodeWithJump, override, prefix);
+}
+
+template<class T>
+static void TestIdentityFunctionMultiplePatching(
+    const T &code,
+    TestOverrideFunction override,
+    FunctionPrefixKind prefix_kind = FunctionPrefixNone) {
+  uptr identity_address;
+  LoadActiveCode(code, &identity_address, prefix_kind);
+
+  // Patch the function.
+  uptr real_identity_address = 0;
+  bool success = override(identity_address,
+                          (uptr)&InterceptorFunction,
+                          &real_identity_address);
+  EXPECT_TRUE(success);
+  EXPECT_NE(0U, real_identity_address);
+
+  // Re-patching the function should not work.
+  success = override(identity_address,
+                     (uptr)&InterceptorFunction,
+                     &real_identity_address);
+  EXPECT_FALSE(success);
+
+  TestOnlyReleaseTrampolineRegions();
+}
+
+TEST(Interception, OverrideFunctionMultiplePatchingIsFailing) {
+#if !SANITIZER_WINDOWS64
+  TestIdentityFunctionMultiplePatching(kIdentityCodeWithPrologue,
+                                       OverrideFunctionWithDetour,
+                                       FunctionPrefixDetour);
+#endif
+
+  TestIdentityFunctionMultiplePatching(kIdentityCodeWithMov,
+                                       OverrideFunctionWithHotPatch,
+                                       FunctionPrefixHotPatch);
+
+  TestIdentityFunctionMultiplePatching(kIdentityCodeWithPushPop,
+                                       OverrideFunctionWithTrampoline,
+                                       FunctionPrefixPadding);
+}
+
+TEST(Interception, OverrideFunctionTwice) {
+  uptr identity_address1;
+  LoadActiveCode(kIdentityTwice, &identity_address1);
+  uptr identity_address2 = identity_address1 + kIdentityTwiceOffset;
+  IdentityFunction identity1 = (IdentityFunction)identity_address1;
+  IdentityFunction identity2 = (IdentityFunction)identity_address2;
+
+  // Patch the two functions.
+  uptr real_identity_address = 0;
+  EXPECT_TRUE(OverrideFunction(identity_address1,
+                               (uptr)&InterceptorFunction,
+                               &real_identity_address));
+  EXPECT_TRUE(OverrideFunction(identity_address2,
+                               (uptr)&InterceptorFunction,
+                               &real_identity_address));
+  IdentityFunction real_identity = (IdentityFunction)real_identity_address;
+  InterceptedRealFunction = real_identity;
+
+  // Calling the redirected function.
+  InterceptorFunctionCalled = 0;
+  EXPECT_EQ(42, identity1(42));
+  EXPECT_EQ(42, identity2(42));
+  EXPECT_EQ(2, InterceptorFunctionCalled);
+
+  TestOnlyReleaseTrampolineRegions();
+}
+
+template<class T>
+static bool TestFunctionPatching(
+    const T &code,
+    TestOverrideFunction override,
+    FunctionPrefixKind prefix_kind = FunctionPrefixNone) {
+  uptr address;
+  LoadActiveCode(code, &address, prefix_kind);
+  uptr unused_real_address = 0;
+  bool result = override(
+      address, (uptr)&InterceptorFunction, &unused_real_address);
+
+  TestOnlyReleaseTrampolineRegions();
+  return result;
+}
+
+TEST(Interception, PatchableFunction) {
+  TestOverrideFunction override = OverrideFunction;
+  // Test without function padding.
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode1, override));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode2, override));
+#if SANITIZER_WINDOWS64
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode3, override));
+#else
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode3, override));
+#endif
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode4, override));
+
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode2, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6, override));
+}
+
+#if !SANITIZER_WINDOWS64
+TEST(Interception, PatchableFunctionWithDetour) {
+  TestOverrideFunction override = OverrideFunctionWithDetour;
+  // Without the prefix, no function can be detoured.
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode1, override));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode2, override));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode3, override));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode4, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode2, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6, override));
+
+  // With the prefix, all functions can be detoured.
+  FunctionPrefixKind prefix = FunctionPrefixDetour;
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode1, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode2, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode3, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode4, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode1, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode2, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode3, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode4, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode5, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode6, override, prefix));
+}
+#endif  // !SANITIZER_WINDOWS64
+
+TEST(Interception, PatchableFunctionWithRedirectJump) {
+  TestOverrideFunction override = OverrideFunctionWithRedirectJump;
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode1, override));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode2, override));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode3, override));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode4, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode2, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5, override));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6, override));
+}
+
+TEST(Interception, PatchableFunctionWithHotPatch) {
+  TestOverrideFunction override = OverrideFunctionWithHotPatch;
+  FunctionPrefixKind prefix = FunctionPrefixHotPatch;
+
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode1, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode2, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode3, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode4, override, prefix));
+
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode2, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6, override, prefix));
+}
+
+TEST(Interception, PatchableFunctionWithTrampoline) {
+  TestOverrideFunction override = OverrideFunctionWithTrampoline;
+  FunctionPrefixKind prefix = FunctionPrefixPadding;
+
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode1, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode2, override, prefix));
+#if SANITIZER_WINDOWS64
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode3, override, prefix));
+#else
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode3, override, prefix));
+#endif
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode4, override, prefix));
+
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode2, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6, override, prefix));
+}
+
+TEST(Interception, PatchableFunctionPadding) {
+  TestOverrideFunction override = OverrideFunction;
+  FunctionPrefixKind prefix = FunctionPrefixPadding;
+
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode1, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode2, override, prefix));
+#if SANITIZER_WINDOWS64
+  EXPECT_FALSE(TestFunctionPatching(kPatchableCode3, override, prefix));
+#else
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode3, override, prefix));
+#endif
+  EXPECT_TRUE(TestFunctionPatching(kPatchableCode4, override, prefix));
+
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1, override, prefix));
+  EXPECT_TRUE(TestFunctionPatching(kUnpatchableCode2, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5, override, prefix));
+  EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6, override, prefix));
+}
+
+}  // namespace __interception
+
+#endif  // SANITIZER_WINDOWS
+#endif  // #if !SANITIZER_DEBUG