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comparison: toolkit/crashreporter/google-breakpad/src/processor/cfi_frame_info-inl.h
toolkit/crashreporter/google-breakpad/src/processor/cfi_frame_info-inl.h
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| 1 // -*- mode: C++ -*- | |
| 2 | |
| 3 // Copyright (c) 2010, Google Inc. | |
| 4 // All rights reserved. | |
| 5 // | |
| 6 // Redistribution and use in source and binary forms, with or without | |
| 7 // modification, are permitted provided that the following conditions are | |
| 8 // met: | |
| 9 // | |
| 10 // * Redistributions of source code must retain the above copyright | |
| 11 // notice, this list of conditions and the following disclaimer. | |
| 12 // * Redistributions in binary form must reproduce the above | |
| 13 // copyright notice, this list of conditions and the following disclaimer | |
| 14 // in the documentation and/or other materials provided with the | |
| 15 // distribution. | |
| 16 // * Neither the name of Google Inc. nor the names of its | |
| 17 // contributors may be used to endorse or promote products derived from | |
| 18 // this software without specific prior written permission. | |
| 19 // | |
| 20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 31 | |
| 32 // Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com> | |
| 33 | |
| 34 // cfi_frame_info-inl.h: Definitions for cfi_frame_info.h inlined functions. | |
| 35 | |
| 36 #ifndef PROCESSOR_CFI_FRAME_INFO_INL_H_ | |
| 37 #define PROCESSOR_CFI_FRAME_INFO_INL_H_ | |
| 38 | |
| 39 #include <string.h> | |
| 40 | |
| 41 namespace google_breakpad { | |
| 42 | |
| 43 template <typename RegisterValueType, class RawContextType> | |
| 44 bool SimpleCFIWalker<RegisterValueType, RawContextType>::FindCallerRegisters( | |
| 45 const MemoryRegion &memory, | |
| 46 const CFIFrameInfo &cfi_frame_info, | |
| 47 const RawContextType &callee_context, | |
| 48 int callee_validity, | |
| 49 RawContextType *caller_context, | |
| 50 int *caller_validity) const { | |
| 51 typedef CFIFrameInfo::RegisterValueMap<RegisterValueType> ValueMap; | |
| 52 ValueMap callee_registers; | |
| 53 ValueMap caller_registers; | |
| 54 | |
| 55 // Populate callee_registers with register values from callee_context. | |
| 56 for (size_t i = 0; i < map_size_; i++) { | |
| 57 const RegisterSet &r = register_map_[i]; | |
| 58 if (callee_validity & r.validity_flag) | |
| 59 callee_registers.set(r.name, callee_context.*r.context_member); | |
| 60 } | |
| 61 | |
| 62 // Apply the rules, and see what register values they yield. | |
| 63 if (!cfi_frame_info | |
| 64 .FindCallerRegs<RegisterValueType>(callee_registers, memory, | |
| 65 &caller_registers)) | |
| 66 return false; | |
| 67 | |
| 68 // Populate *caller_context with the values the rules placed in | |
| 69 // caller_registers. | |
| 70 memset(caller_context, 0xda, sizeof(*caller_context)); | |
| 71 *caller_validity = 0; | |
| 72 for (size_t i = 0; i < map_size_; i++) { | |
| 73 const RegisterSet &r = register_map_[i]; | |
| 74 | |
| 75 // Did the rules provide a value for this register by its name? | |
| 76 bool found = false; | |
| 77 RegisterValueType v = caller_registers.get(&found, r.name); | |
| 78 if (found) { | |
| 79 caller_context->*r.context_member = v; | |
| 80 *caller_validity |= r.validity_flag; | |
| 81 continue; | |
| 82 } | |
| 83 | |
| 84 // Did the rules provide a value for this register under its | |
| 85 // alternate name? | |
| 86 if (r.alternate_name) { | |
| 87 found = false; | |
| 88 v = caller_registers.get(&found, r.alternate_name); | |
| 89 if (found) { | |
| 90 caller_context->*r.context_member = v; | |
| 91 *caller_validity |= r.validity_flag; | |
| 92 continue; | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 // Is this a callee-saves register? The walker assumes that these | |
| 97 // still hold the caller's value if the CFI doesn't mention them. | |
| 98 // | |
| 99 // Note that other frame walkers may fail to recover callee-saves | |
| 100 // registers; for example, the x86 "traditional" strategy only | |
| 101 // recovers %eip, %esp, and %ebp, even though %ebx, %esi, and %edi | |
| 102 // are callee-saves, too. It is not correct to blindly set the | |
| 103 // valid bit for all callee-saves registers, without first | |
| 104 // checking its validity bit in the callee. | |
| 105 if (r.callee_saves && (callee_validity & r.validity_flag) != 0) { | |
| 106 caller_context->*r.context_member = callee_context.*r.context_member; | |
| 107 *caller_validity |= r.validity_flag; | |
| 108 continue; | |
| 109 } | |
| 110 | |
| 111 // Otherwise, the register's value is unknown. | |
| 112 } | |
| 113 | |
| 114 return true; | |
| 115 } | |
| 116 | |
| 117 } // namespace google_breakpad | |
| 118 | |
| 119 #endif // PROCESSOR_CFI_FRAME_INFO_INL_H_ |
