OLD | NEW |
(Empty) | |
| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "base/compiler_specific.h" |
| 6 #include "base/memory/scoped_ptr.h" |
| 7 #include "base/profiler/win32_stack_frame_unwinder.h" |
| 8 #include "testing/gtest/include/gtest/gtest.h" |
| 9 |
| 10 namespace base { |
| 11 |
| 12 namespace { |
| 13 |
| 14 class TestUnwindFunctions : public Win32StackFrameUnwinder::UnwindFunctions { |
| 15 public: |
| 16 TestUnwindFunctions(); |
| 17 |
| 18 PRUNTIME_FUNCTION LookupFunctionEntry(DWORD64 program_counter, |
| 19 PDWORD64 image_base) override; |
| 20 void VirtualUnwind(DWORD64 image_base, |
| 21 DWORD64 program_counter, |
| 22 PRUNTIME_FUNCTION runtime_function, |
| 23 CONTEXT* context) override; |
| 24 |
| 25 void SetNoUnwindInfoForNextFrame(); |
| 26 void SetImageBaseForNextFrame(DWORD64 image_base); |
| 27 |
| 28 private: |
| 29 enum { kRuntimeFunctionPointerIncrement = 1, kImageBaseIncrement = 1 << 20 }; |
| 30 |
| 31 static const PRUNTIME_FUNCTION kNonNullRuntimeFunctionPointer; |
| 32 |
| 33 DWORD64 supplied_program_counter_; |
| 34 DWORD64 custom_image_base_; |
| 35 DWORD64 next_image_base_; |
| 36 bool next_lookup_returns_null_; |
| 37 |
| 38 DISALLOW_COPY_AND_ASSIGN(TestUnwindFunctions); |
| 39 }; |
| 40 |
| 41 // This value is opaque to Win32StackFrameUnwinder. |
| 42 const PRUNTIME_FUNCTION TestUnwindFunctions::kNonNullRuntimeFunctionPointer = |
| 43 reinterpret_cast<PRUNTIME_FUNCTION>(8); |
| 44 |
| 45 TestUnwindFunctions::TestUnwindFunctions() |
| 46 : supplied_program_counter_(0), |
| 47 custom_image_base_(0), |
| 48 next_image_base_(kImageBaseIncrement), |
| 49 next_lookup_returns_null_(false) { |
| 50 } |
| 51 |
| 52 PRUNTIME_FUNCTION TestUnwindFunctions::LookupFunctionEntry( |
| 53 DWORD64 program_counter, |
| 54 PDWORD64 image_base) { |
| 55 supplied_program_counter_ = program_counter; |
| 56 if (custom_image_base_) { |
| 57 *image_base = custom_image_base_; |
| 58 custom_image_base_ = 0; |
| 59 } else { |
| 60 *image_base = next_image_base_; |
| 61 next_image_base_ += kImageBaseIncrement; |
| 62 } |
| 63 if (next_lookup_returns_null_) { |
| 64 next_lookup_returns_null_ = false; |
| 65 return nullptr; |
| 66 } |
| 67 |
| 68 return kNonNullRuntimeFunctionPointer; |
| 69 } |
| 70 |
| 71 void TestUnwindFunctions::VirtualUnwind(DWORD64 image_base, |
| 72 DWORD64 program_counter, |
| 73 PRUNTIME_FUNCTION runtime_function, |
| 74 CONTEXT* context) { |
| 75 EXPECT_EQ(next_image_base_ - kImageBaseIncrement, image_base); |
| 76 EXPECT_EQ(supplied_program_counter_, program_counter); |
| 77 // This function should only be called when LookupFunctionEntry returns a |
| 78 // non-null value. |
| 79 EXPECT_EQ(kNonNullRuntimeFunctionPointer, runtime_function); |
| 80 } |
| 81 |
| 82 void TestUnwindFunctions::SetNoUnwindInfoForNextFrame() { |
| 83 next_lookup_returns_null_ = true; |
| 84 } |
| 85 |
| 86 void TestUnwindFunctions::SetImageBaseForNextFrame(DWORD64 image_base) { |
| 87 next_image_base_ = image_base; |
| 88 } |
| 89 |
| 90 } // namespace |
| 91 |
| 92 class Win32StackFrameUnwinderTest : public testing::Test { |
| 93 protected: |
| 94 Win32StackFrameUnwinderTest() {} |
| 95 |
| 96 // This exists so that Win32StackFrameUnwinder's constructor can be private |
| 97 // with a single friend declaration of this test fixture. |
| 98 scoped_ptr<Win32StackFrameUnwinder> CreateUnwinder(); |
| 99 |
| 100 TestUnwindFunctions unwind_functions_; |
| 101 |
| 102 private: |
| 103 DISALLOW_COPY_AND_ASSIGN(Win32StackFrameUnwinderTest); |
| 104 }; |
| 105 |
| 106 scoped_ptr<Win32StackFrameUnwinder> |
| 107 Win32StackFrameUnwinderTest::CreateUnwinder() { |
| 108 return make_scoped_ptr(new Win32StackFrameUnwinder(&unwind_functions_)); |
| 109 } |
| 110 |
| 111 // Checks the case where all frames have unwind information. |
| 112 TEST_F(Win32StackFrameUnwinderTest, FramesWithUnwindInfo) { |
| 113 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 114 CONTEXT context = {0}; |
| 115 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 116 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 117 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 118 } |
| 119 |
| 120 // Checks that the CONTEXT's stack pointer gets popped when the top frame has no |
| 121 // unwind information. |
| 122 TEST_F(Win32StackFrameUnwinderTest, FrameAtTopWithoutUnwindInfo) { |
| 123 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 124 CONTEXT context = {0}; |
| 125 const DWORD64 original_rsp = 128; |
| 126 context.Rsp = original_rsp; |
| 127 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 128 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 129 EXPECT_EQ(original_rsp, context.Rip); |
| 130 EXPECT_EQ(original_rsp + 8, context.Rsp); |
| 131 |
| 132 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 133 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 134 } |
| 135 |
| 136 // Checks that a frame below the top of the stack with missing unwind info |
| 137 // results in blacklisting the module. |
| 138 TEST_F(Win32StackFrameUnwinderTest, BlacklistedModule) { |
| 139 const DWORD64 image_base_for_module_with_bad_function = 1024; |
| 140 { |
| 141 // First stack, with a bad function below the top of the stack. |
| 142 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 143 CONTEXT context = {0}; |
| 144 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 145 |
| 146 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 147 unwind_functions_.SetImageBaseForNextFrame( |
| 148 image_base_for_module_with_bad_function); |
| 149 EXPECT_FALSE(unwinder->TryUnwind(&context)); |
| 150 } |
| 151 |
| 152 { |
| 153 // Second stack; check that a function at the top of the stack without |
| 154 // unwind info from the previously-seen module is blacklisted. |
| 155 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 156 CONTEXT context = {0}; |
| 157 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 158 unwind_functions_.SetImageBaseForNextFrame( |
| 159 image_base_for_module_with_bad_function); |
| 160 EXPECT_FALSE(unwinder->TryUnwind(&context)); |
| 161 } |
| 162 |
| 163 { |
| 164 // Third stack; check that a function at the top of the stack *with* unwind |
| 165 // info from the previously-seen module is not blacklisted. Then check that |
| 166 // functions below the top of the stack with unwind info are not |
| 167 // blacklisted, regardless of whether they are in the previously-seen |
| 168 // module. |
| 169 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 170 CONTEXT context = {0}; |
| 171 unwind_functions_.SetImageBaseForNextFrame( |
| 172 image_base_for_module_with_bad_function); |
| 173 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 174 |
| 175 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 176 |
| 177 unwind_functions_.SetImageBaseForNextFrame( |
| 178 image_base_for_module_with_bad_function); |
| 179 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 180 } |
| 181 |
| 182 { |
| 183 // Fourth stack; check that a function at the top of the stack without |
| 184 // unwind info and not from the previously-seen module is not |
| 185 // blacklisted. Then check that functions below the top of the stack with |
| 186 // unwind info are not blacklisted, regardless of whether they are in the |
| 187 // previously-seen module. |
| 188 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 189 CONTEXT context = {0}; |
| 190 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 191 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 192 |
| 193 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 194 |
| 195 unwind_functions_.SetImageBaseForNextFrame( |
| 196 image_base_for_module_with_bad_function); |
| 197 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 198 } |
| 199 } |
| 200 |
| 201 // Checks that a frame below the top of the stack with missing unwind info does |
| 202 // not result in blacklisting the module if the first frame also was missing |
| 203 // unwind info. This ensures we don't blacklist an innocent module because the |
| 204 // first frame was bad but we didn't know it at the time. |
| 205 TEST_F(Win32StackFrameUnwinderTest, ModuleFromQuestionableFrameNotBlacklisted) { |
| 206 const DWORD64 image_base_for_questionable_module = 2048; |
| 207 { |
| 208 // First stack, with both the first and second frames missing unwind info. |
| 209 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 210 CONTEXT context = {0}; |
| 211 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 212 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 213 |
| 214 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 215 unwind_functions_.SetImageBaseForNextFrame( |
| 216 image_base_for_questionable_module); |
| 217 EXPECT_FALSE(unwinder->TryUnwind(&context)); |
| 218 } |
| 219 |
| 220 { |
| 221 // Second stack; check that the questionable module was not blacklisted. |
| 222 scoped_ptr<Win32StackFrameUnwinder> unwinder = CreateUnwinder(); |
| 223 CONTEXT context = {0}; |
| 224 unwind_functions_.SetNoUnwindInfoForNextFrame(); |
| 225 unwind_functions_.SetImageBaseForNextFrame( |
| 226 image_base_for_questionable_module); |
| 227 EXPECT_TRUE(unwinder->TryUnwind(&context)); |
| 228 } |
| 229 } |
| 230 |
| 231 } // namespace base |
OLD | NEW |