The Tor Browser: toolkit/crashreporter/google-breakpad/src/common/dwarf_cfi_to

toolkit/crashreporter/google-breakpad/src/common/dwarf_cfi_to_module.cc@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/common/dwarf_cfi_to_module.cc

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 // -*- mode: c++ -*-
 // Copyright (c) 2010, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
 // Implementation of google_breakpad::DwarfCFIToModule.
 // See dwarf_cfi_to_module.h for details.
 #include <sstream>
 #include <iomanip>
 #include "common/dwarf_cfi_to_module.h"
 #include "common/logging.h"
 namespace google_breakpad {
 using std::ostringstream;
 vector<const UniqueString*> DwarfCFIToModule::RegisterNames::MakeVector(
     const char* const* strings,
     size_t size) {
   vector<const UniqueString*> names(size, NULL);
   for (size_t i = 0; i < size; ++i) {
     names[i] = ToUniqueString(strings[i]);
   }
   return names;
 }
 vector<const UniqueString*> DwarfCFIToModule::RegisterNames::I386() {
   static const char *const names[] = {
     "$eax", "$ecx", "$edx", "$ebx", "$esp", "$ebp", "$esi", "$edi",
     "$eip", "$eflags", "$unused1",
     "$st0", "$st1", "$st2", "$st3", "$st4", "$st5", "$st6", "$st7",
     "$unused2", "$unused3",
     "$xmm0", "$xmm1", "$xmm2", "$xmm3", "$xmm4", "$xmm5", "$xmm6", "$xmm7",
     "$mm0", "$mm1", "$mm2", "$mm3", "$mm4", "$mm5", "$mm6", "$mm7",
     "$fcw", "$fsw", "$mxcsr",
     "$es", "$cs", "$ss", "$ds", "$fs", "$gs", "$unused4", "$unused5",
     "$tr", "$ldtr"
   };
   return MakeVector(names, sizeof(names) / sizeof(names[0]));
 }
 vector<const UniqueString*> DwarfCFIToModule::RegisterNames::X86_64() {
   static const char *const names[] = {
     "$rax", "$rdx", "$rcx", "$rbx", "$rsi", "$rdi", "$rbp", "$rsp",
     "$r8",  "$r9",  "$r10", "$r11", "$r12", "$r13", "$r14", "$r15",
     "$rip",
     "$xmm0","$xmm1","$xmm2", "$xmm3", "$xmm4", "$xmm5", "$xmm6", "$xmm7",
     "$xmm8","$xmm9","$xmm10","$xmm11","$xmm12","$xmm13","$xmm14","$xmm15",
     "$st0", "$st1", "$st2", "$st3", "$st4", "$st5", "$st6", "$st7",
     "$mm0", "$mm1", "$mm2", "$mm3", "$mm4", "$mm5", "$mm6", "$mm7",
     "$rflags",
     "$es", "$cs", "$ss", "$ds", "$fs", "$gs", "$unused1", "$unused2",
     "$fs.base", "$gs.base", "$unused3", "$unused4",
     "$tr", "$ldtr",
     "$mxcsr", "$fcw", "$fsw"
   };
   return MakeVector(names, sizeof(names) / sizeof(names[0]));
 }
 // Per ARM IHI 0040A, section 3.1
 vector<const UniqueString*> DwarfCFIToModule::RegisterNames::ARM() {
   static const char *const names[] = {
     "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
     "r8",  "r9",  "r10", "r11", "r12", "sp",  "lr",  "pc",
     "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",
     "fps", "cpsr", "",   "",    "",    "",    "",    "",
     "",    "",    "",    "",    "",    "",    "",    "",
     "",    "",    "",    "",    "",    "",    "",    "",
     "",    "",    "",    "",    "",    "",    "",    "",
     "",    "",    "",    "",    "",    "",    "",    "",
     "s0",  "s1",  "s2",  "s3",  "s4",  "s5",  "s6",  "s7",
     "s8",  "s9",  "s10", "s11", "s12", "s13", "s14", "s15",
     "s16", "s17", "s18", "s19", "s20", "s21", "s22", "s23",
     "s24", "s25", "s26", "s27", "s28", "s29", "s30", "s31",
     "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7"
   };
   return MakeVector(names, sizeof(names) / sizeof(names[0]));
 }
 bool DwarfCFIToModule::Entry(size_t offset, uint64 address, uint64 length,
                              uint8 version, const string &augmentation,
                              unsigned return_address) {
   assert(!entry_);
   // If dwarf2reader::CallFrameInfo can handle this version and
   // augmentation, then we should be okay with that, so there's no
   // need to check them here.
   // Get ready to collect entries.
   entry_ = new Module::StackFrameEntry;
   entry_->address = address;
   entry_->size = length;
   entry_offset_ = offset;
   return_address_ = return_address;
   // Breakpad STACK CFI records must provide a .ra rule, but DWARF CFI
   // may not establish any rule for .ra if the return address column
   // is an ordinary register, and that register holds the return
   // address on entry to the function. So establish an initial .ra
   // rule citing the return address register.
   if (return_address_ < register_names_.size())
     entry_->initial_rules[ustr__ZDra()]
       = Module::Expr(register_names_[return_address_], 0, false);
   return true;
 }
 const UniqueString* DwarfCFIToModule::RegisterName(int i) {
   assert(entry_);
   if (i < 0) {
     assert(i == kCFARegister);
     return ustr__ZDcfa();
   }
   unsigned reg = i;
   if (reg == return_address_)
     return ustr__ZDra();
   // Ensure that a non-empty name exists for this register value.
   if (reg < register_names_.size() && register_names_[reg] != ustr__empty())
     return register_names_[reg];
   reporter_->UnnamedRegister(entry_offset_, reg);
   char buf[30];
   sprintf(buf, "unnamed_register%u", reg);
   return ToUniqueString(buf);
 }
 void DwarfCFIToModule::Record(Module::Address address, int reg,
                               const Module::Expr &rule) {
   assert(entry_);
   // Is this one of this entry's initial rules?
   if (address == entry_->address)
     entry_->initial_rules[RegisterName(reg)] = rule;
   // File it under the appropriate address.
   else
     entry_->rule_changes[address][RegisterName(reg)] = rule;
 }
 bool DwarfCFIToModule::UndefinedRule(uint64 address, int reg) {
   reporter_->UndefinedNotSupported(entry_offset_, RegisterName(reg));
   // Treat this as a non-fatal error.
   return true;
 }
 bool DwarfCFIToModule::SameValueRule(uint64 address, int reg) {
   // reg + 0
   Module::Expr rule
     = Module::Expr(RegisterName(reg), 0, false);
   Record(address, reg, rule);
   return true;
 }
 bool DwarfCFIToModule::OffsetRule(uint64 address, int reg,
                                   int base_register, long offset) {
   // *(base_register + offset)
   Module::Expr rule
     = Module::Expr(RegisterName(base_register), offset, true);
   Record(address, reg, rule);
   return true;
 }
 bool DwarfCFIToModule::ValOffsetRule(uint64 address, int reg,
                                      int base_register, long offset) {
   // base_register + offset
   Module::Expr rule
     = Module::Expr(RegisterName(base_register), offset, false);
   Record(address, reg, rule);
   return true;
 }
 bool DwarfCFIToModule::RegisterRule(uint64 address, int reg,
                                     int base_register) {
   // base_register + 0
   Module::Expr rule
     = Module::Expr(RegisterName(base_register), 0, false);
   Record(address, reg, rule);
   return true;
 }
 bool DwarfCFIToModule::ExpressionRule(uint64 address, int reg,
                                       const string &expression) {
   reporter_->ExpressionsNotSupported(entry_offset_, RegisterName(reg));
   // Treat this as a non-fatal error.
   return true;
 }
 bool DwarfCFIToModule::ValExpressionRule(uint64 address, int reg,
                                          const string &expression) {
   reporter_->ExpressionsNotSupported(entry_offset_, RegisterName(reg));
   // Treat this as a non-fatal error.
   return true;
 }
 bool DwarfCFIToModule::End() {
   module_->AddStackFrameEntry(entry_);
   entry_ = NULL;
   return true;
 }
 void DwarfCFIToModule::Reporter::UnnamedRegister(size_t offset, int reg) {
   BPLOG(INFO) << file_ << ", section '" << section_
     << "': the call frame entry at offset 0x"
     << std::setbase(16) << offset << std::setbase(10)
     << " refers to register " << reg << ", whose name we don't know";
 }
 void DwarfCFIToModule::Reporter::UndefinedNotSupported(
     size_t offset,
     const UniqueString* reg) {
   BPLOG(INFO) << file_ << ", section '" << section_
     << "': the call frame entry at offset 0x"
     << std::setbase(16) << offset << std::setbase(10)
     << " sets the rule for register '" << FromUniqueString(reg)
     << "' to 'undefined', but the Breakpad symbol file format cannot "
     << " express this";
 }
 void DwarfCFIToModule::Reporter::ExpressionsNotSupported(
     size_t offset,
     const UniqueString* reg) {
   static uint64_t n_complaints = 0; // This isn't threadsafe
   n_complaints++;
   if (!is_power_of_2(n_complaints))
     return;
   BPLOG(INFO) << file_ << ", section '" << section_
     << "': the call frame entry at offset 0x"
     << std::setbase(16) << offset << std::setbase(10)
     << " uses a DWARF expression to describe how to recover register '"
     << FromUniqueString(reg) << "', but this translator cannot yet "
     << "translate DWARF expressions to Breakpad postfix expressions (shown "
     << n_complaints << " times)";
 }
 } // namespace google_breakpad

The Tor Browser / annotate

toolkit/crashreporter/google-breakpad/src/common/dwarf_cfi_to_module.cc@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/common/dwarf_cfi_to_module.cc