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Diffstat (limited to 'src/common/dwarf/cfi_assembler.cc')
-rw-r--r-- | src/common/dwarf/cfi_assembler.cc | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/common/dwarf/cfi_assembler.cc b/src/common/dwarf/cfi_assembler.cc new file mode 100644 index 00000000..07995458 --- /dev/null +++ b/src/common/dwarf/cfi_assembler.cc @@ -0,0 +1,103 @@ +// 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> + +// cfi_assembler.cc: Implementation of google_breakpad::CFISection class. +// See cfi_assembler.h for details. + +#include <cassert> + +#include "common/dwarf/cfi_assembler.h" +#include "common/dwarf/dwarf2enums.h" + +namespace google_breakpad { + +CFISection &CFISection::CIEHeader(u_int64_t code_alignment_factor, + int data_alignment_factor, + unsigned return_address_register, + u_int8_t version, + const string &augmentation, + bool dwarf64) { + assert(!entry_length_); + entry_length_ = new PendingLength(); + + if (dwarf64) { + D32(0xffffffff); + D64(entry_length_->length); + entry_length_->start = Here(); + D64(0xffffffffffffffffULL); // CIE distinguished value + } else { + D32(entry_length_->length); + entry_length_->start = Here(); + D32(0xffffffff); // CIE distinguished value + } + D8(version); + AppendCString(augmentation); + ULEB128(code_alignment_factor); + LEB128(data_alignment_factor); + if (version == 1) + D8(return_address_register); + else + ULEB128(return_address_register); + return *this; +} + +CFISection &CFISection::FDEHeader(Label cie_pointer, + u_int64_t initial_location, + u_int64_t address_range, + bool dwarf64) { + assert(!entry_length_); + entry_length_ = new PendingLength(); + + if (dwarf64) { + D32(0xffffffff); + D64(entry_length_->length); + entry_length_->start = Here(); + D64(cie_pointer); + } else { + D32(entry_length_->length); + entry_length_->start = Here(); + D32(cie_pointer); + } + Append(endianness(), address_size_, initial_location); + Append(endianness(), address_size_, address_range); + return *this; +} + +CFISection &CFISection::FinishEntry() { + assert(entry_length_); + Align(address_size_, dwarf2reader::DW_CFA_nop); + entry_length_->length = Here() - entry_length_->start; + delete entry_length_; + entry_length_ = NULL; + return *this; +} + +}; |