LCOV - code coverage report
Current view: directory - toolkit/crashreporter/google-breakpad/src/common - dwarf_cfi_to_module.cc (source / functions) Found Hit Coverage
Test: app.info Lines: 80 59 73.8 %
Date: 2012-06-02 Functions: 18 12 66.7 %

       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                 : // Implementation of google_breakpad::DwarfCFIToModule.
      35                 : // See dwarf_cfi_to_module.h for details.
      36                 : 
      37                 : #include <sstream>
      38                 : 
      39                 : #include "common/dwarf_cfi_to_module.h"
      40                 : 
      41                 : namespace google_breakpad {
      42                 : 
      43                 : using std::ostringstream;
      44                 : 
      45             248 : vector<string> DwarfCFIToModule::RegisterNames::MakeVector(
      46                 :     const char * const *strings,
      47                 :     size_t size) {
      48             248 :   vector<string> names(strings, strings + size);
      49                 :   return names;
      50                 : }
      51                 : 
      52             248 : vector<string> DwarfCFIToModule::RegisterNames::I386() {
      53                 :   static const char *const names[] = {
      54                 :     "$eax", "$ecx", "$edx", "$ebx", "$esp", "$ebp", "$esi", "$edi",
      55                 :     "$eip", "$eflags", "$unused1",
      56                 :     "$st0", "$st1", "$st2", "$st3", "$st4", "$st5", "$st6", "$st7",
      57                 :     "$unused2", "$unused3",
      58                 :     "$xmm0", "$xmm1", "$xmm2", "$xmm3", "$xmm4", "$xmm5", "$xmm6", "$xmm7",
      59                 :     "$mm0", "$mm1", "$mm2", "$mm3", "$mm4", "$mm5", "$mm6", "$mm7",
      60                 :     "$fcw", "$fsw", "$mxcsr",
      61                 :     "$es", "$cs", "$ss", "$ds", "$fs", "$gs", "$unused4", "$unused5",
      62                 :     "$tr", "$ldtr"
      63                 :   };
      64                 : 
      65             248 :   return MakeVector(names, sizeof(names) / sizeof(names[0]));
      66                 : }
      67                 : 
      68               0 : vector<string> DwarfCFIToModule::RegisterNames::X86_64() {
      69                 :   static const char *const names[] = {
      70                 :     "$rax", "$rdx", "$rcx", "$rbx", "$rsi", "$rdi", "$rbp", "$rsp",
      71                 :     "$r8",  "$r9",  "$r10", "$r11", "$r12", "$r13", "$r14", "$r15",
      72                 :     "$rip",
      73                 :     "$xmm0","$xmm1","$xmm2", "$xmm3", "$xmm4", "$xmm5", "$xmm6", "$xmm7",
      74                 :     "$xmm8","$xmm9","$xmm10","$xmm11","$xmm12","$xmm13","$xmm14","$xmm15",
      75                 :     "$st0", "$st1", "$st2", "$st3", "$st4", "$st5", "$st6", "$st7",
      76                 :     "$mm0", "$mm1", "$mm2", "$mm3", "$mm4", "$mm5", "$mm6", "$mm7",
      77                 :     "$rflags",
      78                 :     "$es", "$cs", "$ss", "$ds", "$fs", "$gs", "$unused1", "$unused2",
      79                 :     "$fs.base", "$gs.base", "$unused3", "$unused4",
      80                 :     "$tr", "$ldtr",
      81                 :     "$mxcsr", "$fcw", "$fsw"
      82                 :   };
      83                 : 
      84               0 :   return MakeVector(names, sizeof(names) / sizeof(names[0]));
      85                 : }
      86                 : 
      87               0 : vector<string> DwarfCFIToModule::RegisterNames::ARM() {
      88                 :   static const char *const names[] = {
      89                 :     "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
      90                 :     "r8",  "r9",  "r10", "r11", "r12", "sp",  "lr",  "pc",
      91                 :     "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",
      92                 :     "fps", "cpsr"
      93                 :   };
      94                 : 
      95               0 :   return MakeVector(names, sizeof(names) / sizeof(names[0]));
      96                 : }
      97                 : 
      98          691722 : bool DwarfCFIToModule::Entry(size_t offset, uint64 address, uint64 length,
      99                 :                              uint8 version, const string &augmentation,
     100                 :                              unsigned return_address) {
     101          691722 :   assert(!entry_);
     102                 : 
     103                 :   // If dwarf2reader::CallFrameInfo can handle this version and
     104                 :   // augmentation, then we should be okay with that, so there's no
     105                 :   // need to check them here.
     106                 : 
     107                 :   // Get ready to collect entries.
     108          691722 :   entry_ = new Module::StackFrameEntry;
     109          691722 :   entry_->address = address;
     110          691722 :   entry_->size = length;
     111          691722 :   entry_offset_ = offset;
     112          691722 :   return_address_ = return_address;
     113                 : 
     114                 :   // Breakpad STACK CFI records must provide a .ra rule, but DWARF CFI
     115                 :   // may not establish any rule for .ra if the return address column
     116                 :   // is an ordinary register, and that register holds the return
     117                 :   // address on entry to the function. So establish an initial .ra
     118                 :   // rule citing the return address register.
     119          691722 :   if (return_address_ < register_names_.size())
     120          691722 :     entry_->initial_rules[ra_name_] = register_names_[return_address_];
     121                 : 
     122          691722 :   return true;
     123                 : }
     124                 : 
     125        12650766 : string DwarfCFIToModule::RegisterName(int i) {
     126        12650766 :   assert(entry_);
     127        12650766 :   if (i < 0) {
     128         4868051 :     assert(i == kCFARegister);
     129         4868051 :     return cfa_name_;
     130                 :   }
     131         7782715 :   unsigned reg = i;
     132         7782715 :   if (reg == return_address_)
     133          691722 :     return ra_name_;
     134                 : 
     135         7090993 :   if (0 <= reg && reg < register_names_.size())
     136         7090993 :     return register_names_[reg];
     137                 : 
     138               0 :   reporter_->UnnamedRegister(entry_offset_, reg);
     139                 :   char buf[30];
     140               0 :   sprintf(buf, "unnamed_register%u", reg);
     141               0 :   return buf;
     142                 : }
     143                 : 
     144         6325237 : void DwarfCFIToModule::Record(Module::Address address, int reg,
     145                 :                               const string &rule) {
     146         6325237 :   assert(entry_);
     147                 : 
     148                 :   // Place the name in our global set of strings, and then use the string
     149                 :   // from the set. Even though the assignment looks like a copy, all the
     150                 :   // major std::string implementations use reference counting internally,
     151                 :   // so the effect is to have all our data structures share copies of rules
     152                 :   // whenever possible. Since register names are drawn from a
     153                 :   // vector<string>, register names are already shared.
     154        12650474 :   string shared_rule = *common_strings_.insert(rule).first;
     155                 : 
     156                 :   // Is this one of this entry's initial rules?
     157         6325237 :   if (address == entry_->address)
     158         1383444 :     entry_->initial_rules[RegisterName(reg)] = shared_rule;
     159                 :   // File it under the appropriate address.
     160                 :   else
     161         4941793 :     entry_->rule_changes[address][RegisterName(reg)] = shared_rule;
     162         6325237 : }
     163                 : 
     164               0 : bool DwarfCFIToModule::UndefinedRule(uint64 address, int reg) {
     165               0 :   reporter_->UndefinedNotSupported(entry_offset_, RegisterName(reg));
     166                 :   // Treat this as a non-fatal error.
     167               0 :   return true;
     168                 : }
     169                 : 
     170         1457223 : bool DwarfCFIToModule::SameValueRule(uint64 address, int reg) {
     171         2914446 :   ostringstream s;
     172         1457223 :   s << RegisterName(reg);
     173         1457223 :   Record(address, reg, s.str());
     174         1457223 :   return true;
     175                 : }
     176                 : 
     177         2189720 : bool DwarfCFIToModule::OffsetRule(uint64 address, int reg,
     178                 :                                   int base_register, long offset) {
     179         4379440 :   ostringstream s;
     180         2189720 :   s << RegisterName(base_register) << " " << offset << " + ^";
     181         2189720 :   Record(address, reg, s.str());
     182         2189720 :   return true;
     183                 : }
     184                 : 
     185         2678294 : bool DwarfCFIToModule::ValOffsetRule(uint64 address, int reg,
     186                 :                                      int base_register, long offset) {
     187         5356588 :   ostringstream s;
     188         2678294 :   s << RegisterName(base_register) << " " << offset << " +";
     189         2678294 :   Record(address, reg, s.str());
     190         2678294 :   return true;
     191                 : }
     192                 : 
     193               0 : bool DwarfCFIToModule::RegisterRule(uint64 address, int reg,
     194                 :                                     int base_register) {
     195               0 :   ostringstream s;
     196               0 :   s << RegisterName(base_register);
     197               0 :   Record(address, reg, s.str());
     198               0 :   return true;
     199                 : }
     200                 : 
     201             255 : bool DwarfCFIToModule::ExpressionRule(uint64 address, int reg,
     202                 :                                       const string &expression) {
     203             255 :   reporter_->ExpressionsNotSupported(entry_offset_, RegisterName(reg));
     204                 :   // Treat this as a non-fatal error.
     205             255 :   return true;
     206                 : }
     207                 : 
     208              37 : bool DwarfCFIToModule::ValExpressionRule(uint64 address, int reg,
     209                 :                                          const string &expression) {
     210              37 :   reporter_->ExpressionsNotSupported(entry_offset_, RegisterName(reg));
     211                 :   // Treat this as a non-fatal error.
     212              37 :   return true;
     213                 : }
     214                 : 
     215          691722 : bool DwarfCFIToModule::End() {
     216          691722 :   module_->AddStackFrameEntry(entry_);
     217          691722 :   entry_ = NULL;
     218          691722 :   return true;
     219                 : }
     220                 : 
     221               0 : void DwarfCFIToModule::Reporter::UnnamedRegister(size_t offset, int reg) {
     222                 :   fprintf(stderr, "%s, section '%s': "
     223                 :           "the call frame entry at offset 0x%zx refers to register %d,"
     224                 :           " whose name we don't know\n",
     225               0 :           file_.c_str(), section_.c_str(), offset, reg);
     226               0 : }
     227                 : 
     228               0 : void DwarfCFIToModule::Reporter::UndefinedNotSupported(size_t offset,
     229                 :                                                        const string &reg) {
     230                 :   fprintf(stderr, "%s, section '%s': "
     231                 :           "the call frame entry at offset 0x%zx sets the rule for "
     232                 :           "register '%s' to 'undefined', but the Breakpad symbol file format"
     233                 :           " cannot express this\n",
     234               0 :           file_.c_str(), section_.c_str(), offset, reg.c_str());
     235               0 : }
     236                 : 
     237             292 : void DwarfCFIToModule::Reporter::ExpressionsNotSupported(size_t offset,
     238                 :                                                          const string &reg) {
     239                 :   fprintf(stderr, "%s, section '%s': "
     240                 :           "the call frame entry at offset 0x%zx uses a DWARF expression to"
     241                 :           " describe how to recover register '%s', "
     242                 :           " but this translator cannot yet translate DWARF expressions to"
     243                 :           " Breakpad postfix expressions\n",
     244             292 :           file_.c_str(), section_.c_str(), offset, reg.c_str());
     245             292 : }
     246                 : 
     247                 : } // namespace google_breakpad

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