UnwindCursor.hpp revision 1.3.2.2
1 1.3.2.2 rmind //===------------------------- UnwindCursor.hpp ---------------------------===// 2 1.3.2.2 rmind // 3 1.3.2.2 rmind // The LLVM Compiler Infrastructure 4 1.3.2.2 rmind // 5 1.3.2.2 rmind // This file is dual licensed under the MIT and the University of Illinois Open 6 1.3.2.2 rmind // Source Licenses. See LICENSE.TXT for details. 7 1.3.2.2 rmind // 8 1.3.2.2 rmind // 9 1.3.2.2 rmind // C++ interface to lower levels of libuwind 10 1.3.2.2 rmind //===----------------------------------------------------------------------===// 11 1.3.2.2 rmind 12 1.3.2.2 rmind #ifndef __UNWINDCURSOR_HPP__ 13 1.3.2.2 rmind #define __UNWINDCURSOR_HPP__ 14 1.3.2.2 rmind 15 1.3.2.2 rmind #include <stdint.h> 16 1.3.2.2 rmind #include <stdlib.h> 17 1.3.2.2 rmind #include <pthread.h> 18 1.3.2.2 rmind 19 1.3.2.2 rmind #include "AddressSpace.hpp" 20 1.3.2.2 rmind #include "DwarfInstructions.hpp" 21 1.3.2.2 rmind #include "Registers.hpp" 22 1.3.2.2 rmind 23 1.3.2.2 rmind namespace _Unwind { 24 1.3.2.2 rmind 25 1.3.2.2 rmind template <typename A, typename R> class UnwindCursor { 26 1.3.2.2 rmind public: 27 1.3.2.2 rmind UnwindCursor(R ®s, A &as) 28 1.3.2.2 rmind : fRegisters(regs), fAddressSpace(as), fUnwindInfoMissing(false), 29 1.3.2.2 rmind fIsSignalFrame(false) { 30 1.3.2.2 rmind memset(&fInfo, 0, sizeof(fInfo)); 31 1.3.2.2 rmind } 32 1.3.2.2 rmind 33 1.3.2.2 rmind uint64_t getIP() const { return fRegisters.getIP(); } 34 1.3.2.2 rmind 35 1.3.2.2 rmind void setIP(uint64_t value) { return fRegisters.setIP(value); } 36 1.3.2.2 rmind 37 1.3.2.2 rmind uint64_t getSP() const { return fRegisters.getSP(); } 38 1.3.2.2 rmind 39 1.3.2.2 rmind void setSP(uint64_t value) { return fRegisters.setSP(value); } 40 1.3.2.2 rmind 41 1.3.2.2 rmind bool validReg(int regNum) { return fRegisters.validRegister(regNum); } 42 1.3.2.2 rmind 43 1.3.2.2 rmind uint64_t getReg(int regNum) { return fRegisters.getRegister(regNum); } 44 1.3.2.2 rmind 45 1.3.2.2 rmind void setReg(int regNum, uint64_t value) { 46 1.3.2.2 rmind fRegisters.setRegister(regNum, value); 47 1.3.2.2 rmind } 48 1.3.2.2 rmind 49 1.3.2.2 rmind step_result step() { 50 1.3.2.2 rmind // Bottom of stack is defined as having no more unwind info. 51 1.3.2.2 rmind if (fUnwindInfoMissing) 52 1.3.2.2 rmind return UNW_STEP_END; 53 1.3.2.2 rmind 54 1.3.2.2 rmind // Apply unwinding to register set. 55 1.3.2.2 rmind switch (this->stepWithDwarfFDE()) { 56 1.3.2.2 rmind case UNW_STEP_FAILED: 57 1.3.2.2 rmind return UNW_STEP_FAILED; 58 1.3.2.2 rmind case UNW_STEP_END: 59 1.3.2.2 rmind return UNW_STEP_END; 60 1.3.2.2 rmind case UNW_STEP_SUCCESS: 61 1.3.2.2 rmind this->setInfoBasedOnIPRegister(true); 62 1.3.2.2 rmind if (fUnwindInfoMissing) 63 1.3.2.2 rmind return UNW_STEP_END; 64 1.3.2.2 rmind 65 1.3.2.2 rmind if (fInfo.extra_args) 66 1.3.2.2 rmind setSP(getSP() + fInfo.extra_args); 67 1.3.2.2 rmind return UNW_STEP_SUCCESS; 68 1.3.2.2 rmind } 69 1.3.2.2 rmind __builtin_unreachable(); 70 1.3.2.2 rmind } 71 1.3.2.2 rmind 72 1.3.2.2 rmind void getInfo(unw_proc_info_t *info) { *info = fInfo; } 73 1.3.2.2 rmind 74 1.3.2.2 rmind bool isSignalFrame() { return fIsSignalFrame; } 75 1.3.2.2 rmind void setInfoBasedOnIPRegister(bool isReturnAddress = false); 76 1.3.2.2 rmind 77 1.3.2.2 rmind void jumpto() { fRegisters.jumpto(); } 78 1.3.2.2 rmind 79 1.3.2.2 rmind private: 80 1.3.2.2 rmind typedef typename A::pint_t pint_t; 81 1.3.2.2 rmind typedef uint32_t EncodedUnwindInfo; 82 1.3.2.2 rmind 83 1.3.2.2 rmind bool getInfoFromDwarfSection(pint_t, pint_t, uint32_t, uint32_t); 84 1.3.2.2 rmind 85 1.3.2.2 rmind step_result stepWithDwarfFDE() { 86 1.3.2.2 rmind return DwarfInstructions<A, R>::stepWithDwarf( 87 1.3.2.2 rmind fAddressSpace, this->getIP(), fInfo.unwind_info, fRegisters, &fInfo); 88 1.3.2.2 rmind } 89 1.3.2.2 rmind 90 1.3.2.2 rmind unw_proc_info_t fInfo; 91 1.3.2.2 rmind R fRegisters; 92 1.3.2.2 rmind A &fAddressSpace; 93 1.3.2.2 rmind bool fUnwindInfoMissing; 94 1.3.2.2 rmind bool fIsSignalFrame; 95 1.3.2.2 rmind }; 96 1.3.2.2 rmind 97 1.3.2.2 rmind template <typename A, typename R> 98 1.3.2.2 rmind void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) { 99 1.3.2.2 rmind pint_t pc = this->getIP(); 100 1.3.2.2 rmind 101 1.3.2.2 rmind // If the last line of a function is a "throw", the compiler sometimes 102 1.3.2.2 rmind // emits no instructions after the call to __cxa_throw. This means 103 1.3.2.2 rmind // the return address is actually the start of the next function. 104 1.3.2.2 rmind // To disambiguate this, back up the PC when we know it is a return 105 1.3.2.2 rmind // address. 106 1.3.2.2 rmind if (isReturnAddress) 107 1.3.2.2 rmind --pc; 108 1.3.2.2 rmind 109 1.3.2.2 rmind pint_t fdeStart, data_base; 110 1.3.2.2 rmind if (!fAddressSpace.findFDE(pc, fdeStart, data_base)) { 111 1.3.2.2 rmind fUnwindInfoMissing = true; 112 1.3.2.2 rmind return; 113 1.3.2.2 rmind } 114 1.3.2.2 rmind fInfo.data_base = data_base; 115 1.3.2.2 rmind 116 1.3.2.2 rmind typename CFI_Parser<A, R>::FDE_Info fdeInfo; 117 1.3.2.2 rmind typename CFI_Parser<A, R>::CIE_Info cieInfo; 118 1.3.2.2 rmind CFI_Parser<A, R>::decodeFDE(fAddressSpace, fdeStart, &fdeInfo, &cieInfo, 119 1.3.2.2 rmind &fInfo); 120 1.3.2.2 rmind if (pc < fdeInfo.pcStart || pc > fdeInfo.pcEnd) { 121 1.3.2.2 rmind fUnwindInfoMissing = true; 122 1.3.2.2 rmind return; 123 1.3.2.2 rmind } 124 1.3.2.2 rmind fInfo.start_ip = fdeInfo.pcStart; 125 1.3.2.2 rmind 126 1.3.2.2 rmind typename CFI_Parser<A, R>::PrologInfo prolog; 127 1.3.2.2 rmind if (!CFI_Parser<A, R>::parseFDEInstructions(fAddressSpace, fdeInfo, cieInfo, 128 1.3.2.2 rmind pc, &prolog, &fInfo)) { 129 1.3.2.2 rmind fUnwindInfoMissing = true; 130 1.3.2.2 rmind return; 131 1.3.2.2 rmind } 132 1.3.2.2 rmind // Save off parsed FDE info 133 1.3.2.2 rmind fInfo.end_ip = fdeInfo.pcEnd; 134 1.3.2.2 rmind fInfo.lsda = fdeInfo.lsda; 135 1.3.2.2 rmind fInfo.handler = cieInfo.personality; 136 1.3.2.2 rmind fInfo.extra_args = prolog.spExtraArgSize; 137 1.3.2.2 rmind fInfo.unwind_info = fdeInfo.fdeStart; 138 1.3.2.2 rmind } 139 1.3.2.2 rmind 140 1.3.2.2 rmind }; // namespace _Unwind 141 1.3.2.2 rmind 142 1.3.2.2 rmind #endif // __UNWINDCURSOR_HPP__ 143
Indexes created Thu Sep 25 16:09:42 GMT 2025