| // -*- 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 "common/dwarf_cfi_to_module.h" |
| |
| namespace google_breakpad { |
| |
| using std::ostringstream; |
| |
| 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[".ra"] = register_names_[return_address_]; |
| |
| return true; |
| } |
| |
| string DwarfCFIToModule::RegisterName(int i) { |
| assert(entry_); |
| if (i < 0) { |
| assert(i == kCFARegister); |
| return ".cfa"; |
| } |
| unsigned reg = i; |
| if (reg == return_address_) |
| return ".ra"; |
| |
| if (0 <= reg && reg < register_names_.size()) |
| return register_names_[reg]; |
| |
| reporter_->UnnamedRegister(entry_offset_, reg); |
| char buf[30]; |
| sprintf(buf, "unnamed_register%u", reg); |
| return buf; |
| } |
| |
| void DwarfCFIToModule::Record(Module::Address address, int reg, |
| const string &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) { |
| ostringstream s; |
| s << RegisterName(reg); |
| Record(address, reg, s.str()); |
| return true; |
| } |
| |
| bool DwarfCFIToModule::OffsetRule(uint64 address, int reg, |
| int base_register, long offset) { |
| ostringstream s; |
| s << RegisterName(base_register) << " " << offset << " + ^"; |
| Record(address, reg, s.str()); |
| return true; |
| } |
| |
| bool DwarfCFIToModule::ValOffsetRule(uint64 address, int reg, |
| int base_register, long offset) { |
| ostringstream s; |
| s << RegisterName(base_register) << " " << offset << " +"; |
| Record(address, reg, s.str()); |
| return true; |
| } |
| |
| bool DwarfCFIToModule::RegisterRule(uint64 address, int reg, |
| int base_register) { |
| ostringstream s; |
| s << RegisterName(base_register); |
| Record(address, reg, s.str()); |
| 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) { |
| fprintf(stderr, "%s, section '%s': " |
| "the call frame entry at offset 0x%zx refers to register %d," |
| " whose name we don't know\n", |
| file_.c_str(), section_.c_str(), offset, reg); |
| } |
| |
| void DwarfCFIToModule::Reporter::UndefinedNotSupported(size_t offset, |
| const string ®) { |
| fprintf(stderr, "%s, section '%s': " |
| "the call frame entry at offset 0x%zx sets the rule for " |
| "register '%s' to 'undefined', but the Breakpad symbol file format" |
| " cannot express this\n", |
| file_.c_str(), section_.c_str(), offset, reg.c_str()); |
| } |
| |
| void DwarfCFIToModule::Reporter::ExpressionsNotSupported(size_t offset, |
| const string ®) { |
| fprintf(stderr, "%s, section '%s': " |
| "the call frame entry at offset 0x%zx uses a DWARF expression to" |
| " describe how to recover register '%s', " |
| " but this translator cannot yet translate DWARF expressions to" |
| " Breakpad postfix expressions\n", |
| file_.c_str(), section_.c_str(), offset, reg.c_str()); |
| } |
| |
| } // namespace google_breakpad |