| //===-- DWARFDebugLine.cpp --------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "DWARFDebugLine.h" |
| |
| //#define ENABLE_DEBUG_PRINTF // DO NOT LEAVE THIS DEFINED: DEBUG ONLY!!! |
| #include <assert.h> |
| |
| #include "lldb/Core/FileSpecList.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Host/Host.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/Timer.h" |
| |
| #include "LogChannelDWARF.h" |
| #include "SymbolFileDWARF.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| using namespace std; |
| |
| //---------------------------------------------------------------------- |
| // Parse |
| // |
| // Parse all information in the debug_line_data into an internal |
| // representation. |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::Parse(const DWARFDataExtractor &debug_line_data) { |
| m_lineTableMap.clear(); |
| lldb::offset_t offset = 0; |
| LineTable::shared_ptr line_table_sp(new LineTable); |
| while (debug_line_data.ValidOffset(offset)) { |
| const lldb::offset_t debug_line_offset = offset; |
| |
| if (line_table_sp.get() == NULL) |
| break; |
| |
| if (ParseStatementTable(debug_line_data, &offset, line_table_sp.get())) { |
| // Make sure we don't don't loop infinitely |
| if (offset <= debug_line_offset) |
| break; |
| // DEBUG_PRINTF("m_lineTableMap[0x%8.8x] = line_table_sp\n", |
| // debug_line_offset); |
| m_lineTableMap[debug_line_offset] = line_table_sp; |
| line_table_sp.reset(new LineTable); |
| } else |
| ++offset; // Try next byte in line table |
| } |
| } |
| |
| void DWARFDebugLine::ParseIfNeeded(const DWARFDataExtractor &debug_line_data) { |
| if (m_lineTableMap.empty()) |
| Parse(debug_line_data); |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::GetLineTable |
| //---------------------------------------------------------------------- |
| DWARFDebugLine::LineTable::shared_ptr |
| DWARFDebugLine::GetLineTable(const dw_offset_t offset) const { |
| DWARFDebugLine::LineTable::shared_ptr line_table_shared_ptr; |
| LineTableConstIter pos = m_lineTableMap.find(offset); |
| if (pos != m_lineTableMap.end()) |
| line_table_shared_ptr = pos->second; |
| return line_table_shared_ptr; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DumpStateToFile |
| //---------------------------------------------------------------------- |
| static void DumpStateToFile(dw_offset_t offset, |
| const DWARFDebugLine::State &state, |
| void *userData) { |
| Log *log = (Log *)userData; |
| if (state.row == DWARFDebugLine::State::StartParsingLineTable) { |
| // If the row is zero we are being called with the prologue only |
| state.prologue->Dump(log); |
| log->PutCString("Address Line Column File"); |
| log->PutCString("------------------ ------ ------ ------"); |
| } else if (state.row == DWARFDebugLine::State::DoneParsingLineTable) { |
| // Done parsing line table |
| } else { |
| log->Printf("0x%16.16" PRIx64 " %6u %6u %6u%s\n", state.address, state.line, |
| state.column, state.file, state.end_sequence ? " END" : ""); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::DumpLineTableRows |
| //---------------------------------------------------------------------- |
| bool DWARFDebugLine::DumpLineTableRows(Log *log, SymbolFileDWARF *dwarf2Data, |
| dw_offset_t debug_line_offset) { |
| const DWARFDataExtractor &debug_line_data = dwarf2Data->get_debug_line_data(); |
| |
| if (debug_line_offset == DW_INVALID_OFFSET) { |
| // Dump line table to a single file only |
| debug_line_offset = 0; |
| while (debug_line_data.ValidOffset(debug_line_offset)) |
| debug_line_offset = |
| DumpStatementTable(log, debug_line_data, debug_line_offset); |
| } else { |
| // Dump line table to a single file only |
| DumpStatementTable(log, debug_line_data, debug_line_offset); |
| } |
| return false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::DumpStatementTable |
| //---------------------------------------------------------------------- |
| dw_offset_t |
| DWARFDebugLine::DumpStatementTable(Log *log, |
| const DWARFDataExtractor &debug_line_data, |
| const dw_offset_t debug_line_offset) { |
| if (debug_line_data.ValidOffset(debug_line_offset)) { |
| lldb::offset_t offset = debug_line_offset; |
| log->Printf("--------------------------------------------------------------" |
| "--------\n" |
| "debug_line[0x%8.8x]\n" |
| "--------------------------------------------------------------" |
| "--------\n", |
| debug_line_offset); |
| |
| if (ParseStatementTable(debug_line_data, &offset, DumpStateToFile, log)) |
| return offset; |
| else |
| return debug_line_offset + 1; // Skip to next byte in .debug_line section |
| } |
| |
| return DW_INVALID_OFFSET; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DumpOpcodes |
| //---------------------------------------------------------------------- |
| bool DWARFDebugLine::DumpOpcodes(Log *log, SymbolFileDWARF *dwarf2Data, |
| dw_offset_t debug_line_offset, |
| uint32_t dump_flags) { |
| const DWARFDataExtractor &debug_line_data = dwarf2Data->get_debug_line_data(); |
| |
| if (debug_line_data.GetByteSize() == 0) { |
| log->Printf("< EMPTY >\n"); |
| return false; |
| } |
| |
| if (debug_line_offset == DW_INVALID_OFFSET) { |
| // Dump line table to a single file only |
| debug_line_offset = 0; |
| while (debug_line_data.ValidOffset(debug_line_offset)) |
| debug_line_offset = DumpStatementOpcodes(log, debug_line_data, |
| debug_line_offset, dump_flags); |
| } else { |
| // Dump line table to a single file only |
| DumpStatementOpcodes(log, debug_line_data, debug_line_offset, dump_flags); |
| } |
| return false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DumpStatementOpcodes |
| //---------------------------------------------------------------------- |
| dw_offset_t DWARFDebugLine::DumpStatementOpcodes( |
| Log *log, const DWARFDataExtractor &debug_line_data, |
| const dw_offset_t debug_line_offset, uint32_t flags) { |
| lldb::offset_t offset = debug_line_offset; |
| if (debug_line_data.ValidOffset(offset)) { |
| Prologue prologue; |
| |
| if (ParsePrologue(debug_line_data, &offset, &prologue)) { |
| log->PutCString("--------------------------------------------------------" |
| "--------------"); |
| log->Printf("debug_line[0x%8.8x]", debug_line_offset); |
| log->PutCString("--------------------------------------------------------" |
| "--------------\n"); |
| prologue.Dump(log); |
| } else { |
| offset = debug_line_offset; |
| log->Printf("0x%8.8" PRIx64 ": skipping pad byte %2.2x", offset, |
| debug_line_data.GetU8(&offset)); |
| return offset; |
| } |
| |
| Row row(prologue.default_is_stmt); |
| const dw_offset_t end_offset = debug_line_offset + prologue.total_length + |
| sizeof(prologue.total_length); |
| |
| assert(debug_line_data.ValidOffset(end_offset - 1)); |
| |
| while (offset < end_offset) { |
| const uint32_t op_offset = offset; |
| uint8_t opcode = debug_line_data.GetU8(&offset); |
| switch (opcode) { |
| case 0: // Extended Opcodes always start with a zero opcode followed by |
| { // a uleb128 length so you can skip ones you don't know about |
| |
| dw_offset_t ext_offset = offset; |
| dw_uleb128_t len = debug_line_data.GetULEB128(&offset); |
| dw_offset_t arg_size = len - (offset - ext_offset); |
| uint8_t sub_opcode = debug_line_data.GetU8(&offset); |
| // if (verbose) |
| // log->Printf( "Extended: <%u> %2.2x ", len, |
| // sub_opcode); |
| |
| switch (sub_opcode) { |
| case DW_LNE_end_sequence: |
| log->Printf("0x%8.8x: DW_LNE_end_sequence", op_offset); |
| row.Dump(log); |
| row.Reset(prologue.default_is_stmt); |
| break; |
| |
| case DW_LNE_set_address: { |
| row.address = debug_line_data.GetMaxU64(&offset, arg_size); |
| log->Printf("0x%8.8x: DW_LNE_set_address (0x%" PRIx64 ")", op_offset, |
| row.address); |
| } break; |
| |
| case DW_LNE_define_file: { |
| FileNameEntry fileEntry; |
| fileEntry.name = debug_line_data.GetCStr(&offset); |
| fileEntry.dir_idx = debug_line_data.GetULEB128(&offset); |
| fileEntry.mod_time = debug_line_data.GetULEB128(&offset); |
| fileEntry.length = debug_line_data.GetULEB128(&offset); |
| log->Printf("0x%8.8x: DW_LNE_define_file('%s', dir=%i, " |
| "mod_time=0x%8.8x, length=%i )", |
| op_offset, fileEntry.name, fileEntry.dir_idx, |
| fileEntry.mod_time, fileEntry.length); |
| prologue.file_names.push_back(fileEntry); |
| } break; |
| |
| case DW_LNE_set_discriminator: { |
| uint64_t discriminator = debug_line_data.GetULEB128(&offset); |
| log->Printf("0x%8.8x: DW_LNE_set_discriminator (0x%" PRIx64 ")", |
| op_offset, discriminator); |
| } break; |
| default: |
| log->Printf("0x%8.8x: DW_LNE_??? (%2.2x) - Skipping unknown upcode", |
| op_offset, opcode); |
| // Length doesn't include the zero opcode byte or the length itself, |
| // but it does include the sub_opcode, so we have to adjust for that |
| // below |
| offset += arg_size; |
| break; |
| } |
| } break; |
| |
| // Standard Opcodes |
| case DW_LNS_copy: |
| log->Printf("0x%8.8x: DW_LNS_copy", op_offset); |
| row.Dump(log); |
| break; |
| |
| case DW_LNS_advance_pc: { |
| dw_uleb128_t addr_offset_n = debug_line_data.GetULEB128(&offset); |
| dw_uleb128_t addr_offset = addr_offset_n * prologue.min_inst_length; |
| log->Printf("0x%8.8x: DW_LNS_advance_pc (0x%x)", op_offset, |
| addr_offset); |
| row.address += addr_offset; |
| } break; |
| |
| case DW_LNS_advance_line: { |
| dw_sleb128_t line_offset = debug_line_data.GetSLEB128(&offset); |
| log->Printf("0x%8.8x: DW_LNS_advance_line (%i)", op_offset, |
| line_offset); |
| row.line += line_offset; |
| } break; |
| |
| case DW_LNS_set_file: |
| row.file = debug_line_data.GetULEB128(&offset); |
| log->Printf("0x%8.8x: DW_LNS_set_file (%u)", op_offset, row.file); |
| break; |
| |
| case DW_LNS_set_column: |
| row.column = debug_line_data.GetULEB128(&offset); |
| log->Printf("0x%8.8x: DW_LNS_set_column (%u)", op_offset, row.column); |
| break; |
| |
| case DW_LNS_negate_stmt: |
| row.is_stmt = !row.is_stmt; |
| log->Printf("0x%8.8x: DW_LNS_negate_stmt", op_offset); |
| break; |
| |
| case DW_LNS_set_basic_block: |
| row.basic_block = true; |
| log->Printf("0x%8.8x: DW_LNS_set_basic_block", op_offset); |
| break; |
| |
| case DW_LNS_const_add_pc: { |
| uint8_t adjust_opcode = 255 - prologue.opcode_base; |
| dw_addr_t addr_offset = |
| (adjust_opcode / prologue.line_range) * prologue.min_inst_length; |
| log->Printf("0x%8.8x: DW_LNS_const_add_pc (0x%8.8" PRIx64 ")", |
| op_offset, addr_offset); |
| row.address += addr_offset; |
| } break; |
| |
| case DW_LNS_fixed_advance_pc: { |
| uint16_t pc_offset = debug_line_data.GetU16(&offset); |
| log->Printf("0x%8.8x: DW_LNS_fixed_advance_pc (0x%4.4x)", op_offset, |
| pc_offset); |
| row.address += pc_offset; |
| } break; |
| |
| case DW_LNS_set_prologue_end: |
| row.prologue_end = true; |
| log->Printf("0x%8.8x: DW_LNS_set_prologue_end", op_offset); |
| break; |
| |
| case DW_LNS_set_epilogue_begin: |
| row.epilogue_begin = true; |
| log->Printf("0x%8.8x: DW_LNS_set_epilogue_begin", op_offset); |
| break; |
| |
| case DW_LNS_set_isa: |
| row.isa = debug_line_data.GetULEB128(&offset); |
| log->Printf("0x%8.8x: DW_LNS_set_isa (%u)", op_offset, row.isa); |
| break; |
| |
| // Special Opcodes |
| default: |
| if (opcode < prologue.opcode_base) { |
| // We have an opcode that this parser doesn't know about, skip the |
| // number of ULEB128 numbers that is says to skip in the prologue's |
| // standard_opcode_lengths array |
| uint8_t n = prologue.standard_opcode_lengths[opcode - 1]; |
| log->Printf("0x%8.8x: Special : Unknown skipping %u ULEB128 values.", |
| op_offset, n); |
| while (n > 0) { |
| debug_line_data.GetULEB128(&offset); |
| --n; |
| } |
| } else { |
| uint8_t adjust_opcode = opcode - prologue.opcode_base; |
| dw_addr_t addr_offset = |
| (adjust_opcode / prologue.line_range) * prologue.min_inst_length; |
| int32_t line_offset = |
| prologue.line_base + (adjust_opcode % prologue.line_range); |
| log->Printf("0x%8.8x: address += 0x%" PRIx64 ", line += %i\n", |
| op_offset, (uint64_t)addr_offset, line_offset); |
| row.address += addr_offset; |
| row.line += line_offset; |
| row.Dump(log); |
| } |
| break; |
| } |
| } |
| return end_offset; |
| } |
| return DW_INVALID_OFFSET; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Parse |
| // |
| // Parse the entire line table contents calling callback each time a new |
| // prologue is parsed and every time a new row is to be added to the line |
| // table. |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::Parse(const DWARFDataExtractor &debug_line_data, |
| DWARFDebugLine::State::Callback callback, |
| void *userData) { |
| lldb::offset_t offset = 0; |
| if (debug_line_data.ValidOffset(offset)) { |
| if (!ParseStatementTable(debug_line_data, &offset, callback, userData)) |
| ++offset; // Skip to next byte in .debug_line section |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::ParsePrologue |
| //---------------------------------------------------------------------- |
| bool DWARFDebugLine::ParsePrologue(const DWARFDataExtractor &debug_line_data, |
| lldb::offset_t *offset_ptr, |
| Prologue *prologue) { |
| const lldb::offset_t prologue_offset = *offset_ptr; |
| |
| // DEBUG_PRINTF("0x%8.8x: ParsePrologue()\n", *offset_ptr); |
| |
| prologue->Clear(); |
| uint32_t i; |
| const char *s; |
| prologue->total_length = debug_line_data.GetDWARFInitialLength(offset_ptr); |
| prologue->version = debug_line_data.GetU16(offset_ptr); |
| if (prologue->version < 2 || prologue->version > 4) |
| return false; |
| |
| prologue->prologue_length = debug_line_data.GetDWARFOffset(offset_ptr); |
| const lldb::offset_t end_prologue_offset = |
| prologue->prologue_length + *offset_ptr; |
| prologue->min_inst_length = debug_line_data.GetU8(offset_ptr); |
| if (prologue->version >= 4) |
| prologue->maximum_operations_per_instruction = |
| debug_line_data.GetU8(offset_ptr); |
| else |
| prologue->maximum_operations_per_instruction = 1; |
| prologue->default_is_stmt = debug_line_data.GetU8(offset_ptr); |
| prologue->line_base = debug_line_data.GetU8(offset_ptr); |
| prologue->line_range = debug_line_data.GetU8(offset_ptr); |
| prologue->opcode_base = debug_line_data.GetU8(offset_ptr); |
| |
| prologue->standard_opcode_lengths.reserve(prologue->opcode_base - 1); |
| |
| for (i = 1; i < prologue->opcode_base; ++i) { |
| uint8_t op_len = debug_line_data.GetU8(offset_ptr); |
| prologue->standard_opcode_lengths.push_back(op_len); |
| } |
| |
| while (*offset_ptr < end_prologue_offset) { |
| s = debug_line_data.GetCStr(offset_ptr); |
| if (s && s[0]) |
| prologue->include_directories.push_back(s); |
| else |
| break; |
| } |
| |
| while (*offset_ptr < end_prologue_offset) { |
| const char *name = debug_line_data.GetCStr(offset_ptr); |
| if (name && name[0]) { |
| FileNameEntry fileEntry; |
| fileEntry.name = name; |
| fileEntry.dir_idx = debug_line_data.GetULEB128(offset_ptr); |
| fileEntry.mod_time = debug_line_data.GetULEB128(offset_ptr); |
| fileEntry.length = debug_line_data.GetULEB128(offset_ptr); |
| prologue->file_names.push_back(fileEntry); |
| } else |
| break; |
| } |
| |
| // XXX GNU as is broken for 64-Bit DWARF |
| if (*offset_ptr != end_prologue_offset) { |
| Host::SystemLog(Host::eSystemLogWarning, |
| "warning: parsing line table prologue at 0x%8.8" PRIx64 |
| " should have ended at 0x%8.8" PRIx64 |
| " but it ended at 0x%8.8" PRIx64 "\n", |
| prologue_offset, end_prologue_offset, *offset_ptr); |
| } |
| return end_prologue_offset; |
| } |
| |
| bool DWARFDebugLine::ParseSupportFiles( |
| const lldb::ModuleSP &module_sp, const DWARFDataExtractor &debug_line_data, |
| const lldb_private::FileSpec &cu_comp_dir, dw_offset_t stmt_list, |
| FileSpecList &support_files) { |
| lldb::offset_t offset = stmt_list; |
| |
| Prologue prologue; |
| if (!ParsePrologue(debug_line_data, &offset, &prologue)) { |
| Host::SystemLog(Host::eSystemLogError, "error: parsing line table prologue " |
| "at 0x%8.8x (parsing ended around " |
| "0x%8.8" PRIx64 "\n", |
| stmt_list, offset); |
| return false; |
| } |
| |
| FileSpec file_spec; |
| std::string remapped_file; |
| |
| for (uint32_t file_idx = 1; |
| prologue.GetFile(file_idx, cu_comp_dir, file_spec); ++file_idx) { |
| if (module_sp->RemapSourceFile(file_spec.GetPath(), remapped_file)) |
| file_spec.SetFile(remapped_file, false, FileSpec::Style::native); |
| support_files.Append(file_spec); |
| } |
| return true; |
| } |
| |
| //---------------------------------------------------------------------- |
| // ParseStatementTable |
| // |
| // Parse a single line table (prologue and all rows) and call the callback |
| // function once for the prologue (row in state will be zero) and each time a |
| // row is to be added to the line table. |
| //---------------------------------------------------------------------- |
| bool DWARFDebugLine::ParseStatementTable( |
| const DWARFDataExtractor &debug_line_data, lldb::offset_t *offset_ptr, |
| DWARFDebugLine::State::Callback callback, void *userData) { |
| Log *log(LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_LINE)); |
| Prologue::shared_ptr prologue(new Prologue()); |
| |
| const dw_offset_t debug_line_offset = *offset_ptr; |
| |
| static Timer::Category func_cat(LLVM_PRETTY_FUNCTION); |
| Timer scoped_timer( |
| func_cat, "DWARFDebugLine::ParseStatementTable (.debug_line[0x%8.8x])", |
| debug_line_offset); |
| |
| if (!ParsePrologue(debug_line_data, offset_ptr, prologue.get())) { |
| if (log) |
| log->Error("failed to parse DWARF line table prologue"); |
| // Restore our offset and return false to indicate failure! |
| *offset_ptr = debug_line_offset; |
| return false; |
| } |
| |
| if (log) |
| prologue->Dump(log); |
| |
| const dw_offset_t end_offset = |
| debug_line_offset + prologue->total_length + |
| (debug_line_data.GetDWARFSizeofInitialLength()); |
| |
| State state(prologue, log, callback, userData); |
| |
| while (*offset_ptr < end_offset) { |
| // DEBUG_PRINTF("0x%8.8x: ", *offset_ptr); |
| uint8_t opcode = debug_line_data.GetU8(offset_ptr); |
| |
| if (opcode == 0) { |
| // Extended Opcodes always start with a zero opcode followed by a uleb128 |
| // length so you can skip ones you don't know about |
| lldb::offset_t ext_offset = *offset_ptr; |
| dw_uleb128_t len = debug_line_data.GetULEB128(offset_ptr); |
| dw_offset_t arg_size = len - (*offset_ptr - ext_offset); |
| |
| // DEBUG_PRINTF("Extended: <%2u> ", len); |
| uint8_t sub_opcode = debug_line_data.GetU8(offset_ptr); |
| switch (sub_opcode) { |
| case DW_LNE_end_sequence: |
| // Set the end_sequence register of the state machine to true and |
| // append a row to the matrix using the current values of the state- |
| // machine registers. Then reset the registers to the initial values |
| // specified above. Every statement program sequence must end with a |
| // DW_LNE_end_sequence instruction which creates a row whose address is |
| // that of the byte after the last target machine instruction of the |
| // sequence. |
| state.end_sequence = true; |
| state.AppendRowToMatrix(*offset_ptr); |
| state.Reset(); |
| break; |
| |
| case DW_LNE_set_address: |
| // Takes a single relocatable address as an operand. The size of the |
| // operand is the size appropriate to hold an address on the target |
| // machine. Set the address register to the value given by the |
| // relocatable address. All of the other statement program opcodes that |
| // affect the address register add a delta to it. This instruction |
| // stores a relocatable value into it instead. |
| if (arg_size == 4) |
| state.address = debug_line_data.GetU32(offset_ptr); |
| else // arg_size == 8 |
| state.address = debug_line_data.GetU64(offset_ptr); |
| break; |
| |
| case DW_LNE_define_file: |
| // Takes 4 arguments. The first is a null terminated string containing |
| // a source file name. The second is an unsigned LEB128 number |
| // representing the directory index of the directory in which the file |
| // was found. The third is an unsigned LEB128 number representing the |
| // time of last modification of the file. The fourth is an unsigned |
| // LEB128 number representing the length in bytes of the file. The time |
| // and length fields may contain LEB128(0) if the information is not |
| // available. |
| // |
| // The directory index represents an entry in the include_directories |
| // section of the statement program prologue. The index is LEB128(0) if |
| // the file was found in the current directory of the compilation, |
| // LEB128(1) if it was found in the first directory in the |
| // include_directories section, and so on. The directory index is |
| // ignored for file names that represent full path names. |
| // |
| // The files are numbered, starting at 1, in the order in which they |
| // appear; the names in the prologue come before names defined by the |
| // DW_LNE_define_file instruction. These numbers are used in the file |
| // register of the state machine. |
| { |
| FileNameEntry fileEntry; |
| fileEntry.name = debug_line_data.GetCStr(offset_ptr); |
| fileEntry.dir_idx = debug_line_data.GetULEB128(offset_ptr); |
| fileEntry.mod_time = debug_line_data.GetULEB128(offset_ptr); |
| fileEntry.length = debug_line_data.GetULEB128(offset_ptr); |
| state.prologue->file_names.push_back(fileEntry); |
| } |
| break; |
| |
| default: |
| // Length doesn't include the zero opcode byte or the length itself, |
| // but it does include the sub_opcode, so we have to adjust for that |
| // below |
| (*offset_ptr) += arg_size; |
| break; |
| } |
| } else if (opcode < prologue->opcode_base) { |
| switch (opcode) { |
| // Standard Opcodes |
| case DW_LNS_copy: |
| // Takes no arguments. Append a row to the matrix using the current |
| // values of the state-machine registers. Then set the basic_block |
| // register to false. |
| state.AppendRowToMatrix(*offset_ptr); |
| break; |
| |
| case DW_LNS_advance_pc: |
| // Takes a single unsigned LEB128 operand, multiplies it by the |
| // min_inst_length field of the prologue, and adds the result to the |
| // address register of the state machine. |
| state.address += |
| debug_line_data.GetULEB128(offset_ptr) * prologue->min_inst_length; |
| break; |
| |
| case DW_LNS_advance_line: |
| // Takes a single signed LEB128 operand and adds that value to the line |
| // register of the state machine. |
| state.line += debug_line_data.GetSLEB128(offset_ptr); |
| break; |
| |
| case DW_LNS_set_file: |
| // Takes a single unsigned LEB128 operand and stores it in the file |
| // register of the state machine. |
| state.file = debug_line_data.GetULEB128(offset_ptr); |
| break; |
| |
| case DW_LNS_set_column: |
| // Takes a single unsigned LEB128 operand and stores it in the column |
| // register of the state machine. |
| state.column = debug_line_data.GetULEB128(offset_ptr); |
| break; |
| |
| case DW_LNS_negate_stmt: |
| // Takes no arguments. Set the is_stmt register of the state machine to |
| // the logical negation of its current value. |
| state.is_stmt = !state.is_stmt; |
| break; |
| |
| case DW_LNS_set_basic_block: |
| // Takes no arguments. Set the basic_block register of the state |
| // machine to true |
| state.basic_block = true; |
| break; |
| |
| case DW_LNS_const_add_pc: |
| // Takes no arguments. Add to the address register of the state machine |
| // the address increment value corresponding to special opcode 255. The |
| // motivation for DW_LNS_const_add_pc is this: when the statement |
| // program needs to advance the address by a small amount, it can use a |
| // single special opcode, which occupies a single byte. When it needs |
| // to advance the address by up to twice the range of the last special |
| // opcode, it can use DW_LNS_const_add_pc followed by a special opcode, |
| // for a total of two bytes. Only if it needs to advance the address by |
| // more than twice that range will it need to use both |
| // DW_LNS_advance_pc and a special opcode, requiring three or more |
| // bytes. |
| { |
| uint8_t adjust_opcode = 255 - prologue->opcode_base; |
| dw_addr_t addr_offset = (adjust_opcode / prologue->line_range) * |
| prologue->min_inst_length; |
| state.address += addr_offset; |
| } |
| break; |
| |
| case DW_LNS_fixed_advance_pc: |
| // Takes a single uhalf operand. Add to the address register of the |
| // state machine the value of the (unencoded) operand. This is the only |
| // extended opcode that takes an argument that is not a variable length |
| // number. The motivation for DW_LNS_fixed_advance_pc is this: existing |
| // assemblers cannot emit DW_LNS_advance_pc or special opcodes because |
| // they cannot encode LEB128 numbers or judge when the computation of a |
| // special opcode overflows and requires the use of DW_LNS_advance_pc. |
| // Such assemblers, however, can use DW_LNS_fixed_advance_pc instead, |
| // sacrificing compression. |
| state.address += debug_line_data.GetU16(offset_ptr); |
| break; |
| |
| case DW_LNS_set_prologue_end: |
| // Takes no arguments. Set the prologue_end register of the state |
| // machine to true |
| state.prologue_end = true; |
| break; |
| |
| case DW_LNS_set_epilogue_begin: |
| // Takes no arguments. Set the basic_block register of the state |
| // machine to true |
| state.epilogue_begin = true; |
| break; |
| |
| case DW_LNS_set_isa: |
| // Takes a single unsigned LEB128 operand and stores it in the column |
| // register of the state machine. |
| state.isa = debug_line_data.GetULEB128(offset_ptr); |
| break; |
| |
| default: |
| // Handle any unknown standard opcodes here. We know the lengths of |
| // such opcodes because they are specified in the prologue as a |
| // multiple of LEB128 operands for each opcode. |
| { |
| uint8_t i; |
| assert(static_cast<size_t>(opcode - 1) < |
| prologue->standard_opcode_lengths.size()); |
| const uint8_t opcode_length = |
| prologue->standard_opcode_lengths[opcode - 1]; |
| for (i = 0; i < opcode_length; ++i) |
| debug_line_data.Skip_LEB128(offset_ptr); |
| } |
| break; |
| } |
| } else { |
| // Special Opcodes |
| |
| // A special opcode value is chosen based on the amount that needs |
| // to be added to the line and address registers. The maximum line |
| // increment for a special opcode is the value of the line_base field in |
| // the header, plus the value of the line_range field, minus 1 (line base |
| // + line range - 1). If the desired line increment is greater than the |
| // maximum line increment, a standard opcode must be used instead of a |
| // special opcode. The "address advance" is calculated by dividing the |
| // desired address increment by the minimum_instruction_length field from |
| // the header. The special opcode is then calculated using the following |
| // formula: |
| // |
| // opcode = (desired line increment - line_base) + (line_range * address |
| // advance) + opcode_base |
| // |
| // If the resulting opcode is greater than 255, a standard opcode must be |
| // used instead. |
| // |
| // To decode a special opcode, subtract the opcode_base from the opcode |
| // itself to give the adjusted opcode. The amount to increment the |
| // address register is the result of the adjusted opcode divided by the |
| // line_range multiplied by the minimum_instruction_length field from the |
| // header. That is: |
| // |
| // address increment = (adjusted opcode / line_range) * |
| // minimum_instruction_length |
| // |
| // The amount to increment the line register is the line_base plus the |
| // result of the adjusted opcode modulo the line_range. That is: |
| // |
| // line increment = line_base + (adjusted opcode % line_range) |
| |
| uint8_t adjust_opcode = opcode - prologue->opcode_base; |
| dw_addr_t addr_offset = |
| (adjust_opcode / prologue->line_range) * prologue->min_inst_length; |
| int32_t line_offset = |
| prologue->line_base + (adjust_opcode % prologue->line_range); |
| state.line += line_offset; |
| state.address += addr_offset; |
| state.AppendRowToMatrix(*offset_ptr); |
| } |
| } |
| |
| state.Finalize(*offset_ptr); |
| |
| return end_offset; |
| } |
| |
| //---------------------------------------------------------------------- |
| // ParseStatementTableCallback |
| //---------------------------------------------------------------------- |
| static void ParseStatementTableCallback(dw_offset_t offset, |
| const DWARFDebugLine::State &state, |
| void *userData) { |
| DWARFDebugLine::LineTable *line_table = (DWARFDebugLine::LineTable *)userData; |
| if (state.row == DWARFDebugLine::State::StartParsingLineTable) { |
| // Just started parsing the line table, so lets keep a reference to the |
| // prologue using the supplied shared pointer |
| line_table->prologue = state.prologue; |
| } else if (state.row == DWARFDebugLine::State::DoneParsingLineTable) { |
| // Done parsing line table, nothing to do for the cleanup |
| } else { |
| // We have a new row, lets append it |
| line_table->AppendRow(state); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // ParseStatementTable |
| // |
| // Parse a line table at offset and populate the LineTable class with the |
| // prologue and all rows. |
| //---------------------------------------------------------------------- |
| bool DWARFDebugLine::ParseStatementTable( |
| const DWARFDataExtractor &debug_line_data, lldb::offset_t *offset_ptr, |
| LineTable *line_table) { |
| return ParseStatementTable(debug_line_data, offset_ptr, |
| ParseStatementTableCallback, line_table); |
| } |
| |
| inline bool DWARFDebugLine::Prologue::IsValid() const { |
| return SymbolFileDWARF::SupportedVersion(version); |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::Prologue::Dump |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::Prologue::Dump(Log *log) { |
| uint32_t i; |
| |
| log->Printf("Line table prologue:"); |
| log->Printf(" total_length: 0x%8.8x", total_length); |
| log->Printf(" version: %u", version); |
| log->Printf("prologue_length: 0x%8.8x", prologue_length); |
| log->Printf("min_inst_length: %u", min_inst_length); |
| log->Printf("default_is_stmt: %u", default_is_stmt); |
| log->Printf(" line_base: %i", line_base); |
| log->Printf(" line_range: %u", line_range); |
| log->Printf(" opcode_base: %u", opcode_base); |
| |
| for (i = 0; i < standard_opcode_lengths.size(); ++i) { |
| log->Printf("standard_opcode_lengths[%s] = %u", DW_LNS_value_to_name(i + 1), |
| standard_opcode_lengths[i]); |
| } |
| |
| if (!include_directories.empty()) { |
| for (i = 0; i < include_directories.size(); ++i) { |
| log->Printf("include_directories[%3u] = '%s'", i + 1, |
| include_directories[i]); |
| } |
| } |
| |
| if (!file_names.empty()) { |
| log->PutCString(" Dir Mod Time File Len File Name"); |
| log->PutCString(" ---- ---------- ---------- " |
| "---------------------------"); |
| for (i = 0; i < file_names.size(); ++i) { |
| const FileNameEntry &fileEntry = file_names[i]; |
| log->Printf("file_names[%3u] %4u 0x%8.8x 0x%8.8x %s", i + 1, |
| fileEntry.dir_idx, fileEntry.mod_time, fileEntry.length, |
| fileEntry.name); |
| } |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::ParsePrologue::Append |
| // |
| // Append the contents of the prologue to the binary stream buffer |
| //---------------------------------------------------------------------- |
| // void |
| // DWARFDebugLine::Prologue::Append(BinaryStreamBuf& buff) const |
| //{ |
| // uint32_t i; |
| // |
| // buff.Append32(total_length); |
| // buff.Append16(version); |
| // buff.Append32(prologue_length); |
| // buff.Append8(min_inst_length); |
| // buff.Append8(default_is_stmt); |
| // buff.Append8(line_base); |
| // buff.Append8(line_range); |
| // buff.Append8(opcode_base); |
| // |
| // for (i=0; i<standard_opcode_lengths.size(); ++i) |
| // buff.Append8(standard_opcode_lengths[i]); |
| // |
| // for (i=0; i<include_directories.size(); ++i) |
| // buff.AppendCStr(include_directories[i].c_str()); |
| // buff.Append8(0); // Terminate the include directory section with empty |
| // string |
| // |
| // for (i=0; i<file_names.size(); ++i) |
| // { |
| // buff.AppendCStr(file_names[i].name.c_str()); |
| // buff.Append32_as_ULEB128(file_names[i].dir_idx); |
| // buff.Append32_as_ULEB128(file_names[i].mod_time); |
| // buff.Append32_as_ULEB128(file_names[i].length); |
| // } |
| // buff.Append8(0); // Terminate the file names section with empty string |
| //} |
| |
| bool DWARFDebugLine::Prologue::GetFile(uint32_t file_idx, |
| const lldb_private::FileSpec &comp_dir, FileSpec &file) const { |
| uint32_t idx = file_idx - 1; // File indexes are 1 based... |
| if (idx < file_names.size()) { |
| file.SetFile(file_names[idx].name, false, FileSpec::Style::native); |
| if (file.IsRelative()) { |
| if (file_names[idx].dir_idx > 0) { |
| const uint32_t dir_idx = file_names[idx].dir_idx - 1; |
| if (dir_idx < include_directories.size()) { |
| file.PrependPathComponent(include_directories[dir_idx]); |
| if (!file.IsRelative()) |
| return true; |
| } |
| } |
| |
| if (comp_dir) |
| file.PrependPathComponent(comp_dir); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::LineTable::Dump |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::LineTable::Dump(Log *log) const { |
| if (prologue.get()) |
| prologue->Dump(log); |
| |
| if (!rows.empty()) { |
| log->PutCString("Address Line Column File ISA Flags"); |
| log->PutCString( |
| "------------------ ------ ------ ------ --- -------------"); |
| Row::const_iterator pos = rows.begin(); |
| Row::const_iterator end = rows.end(); |
| while (pos != end) { |
| (*pos).Dump(log); |
| ++pos; |
| } |
| } |
| } |
| |
| void DWARFDebugLine::LineTable::AppendRow(const DWARFDebugLine::Row &state) { |
| rows.push_back(state); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Compare function for the binary search in |
| // DWARFDebugLine::LineTable::LookupAddress() |
| //---------------------------------------------------------------------- |
| static bool FindMatchingAddress(const DWARFDebugLine::Row &row1, |
| const DWARFDebugLine::Row &row2) { |
| return row1.address < row2.address; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::LineTable::LookupAddress |
| //---------------------------------------------------------------------- |
| uint32_t DWARFDebugLine::LineTable::LookupAddress(dw_addr_t address, |
| dw_addr_t cu_high_pc) const { |
| uint32_t index = UINT32_MAX; |
| if (!rows.empty()) { |
| // Use the lower_bound algorithm to perform a binary search since we know |
| // that our line table data is ordered by address. |
| DWARFDebugLine::Row row; |
| row.address = address; |
| Row::const_iterator begin_pos = rows.begin(); |
| Row::const_iterator end_pos = rows.end(); |
| Row::const_iterator pos = |
| lower_bound(begin_pos, end_pos, row, FindMatchingAddress); |
| if (pos == end_pos) { |
| if (address < cu_high_pc) |
| return rows.size() - 1; |
| } else { |
| // Rely on fact that we are using a std::vector and we can do pointer |
| // arithmetic to find the row index (which will be one less that what we |
| // found since it will find the first position after the current address) |
| // since std::vector iterators are just pointers to the container type. |
| index = pos - begin_pos; |
| if (pos->address > address) { |
| if (index > 0) |
| --index; |
| else |
| index = UINT32_MAX; |
| } |
| } |
| } |
| return index; // Failed to find address |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::Row::Row |
| //---------------------------------------------------------------------- |
| DWARFDebugLine::Row::Row(bool default_is_stmt) |
| : address(0), line(1), column(0), file(1), is_stmt(default_is_stmt), |
| basic_block(false), end_sequence(false), prologue_end(false), |
| epilogue_begin(false), isa(0) {} |
| |
| //---------------------------------------------------------------------- |
| // Called after a row is appended to the matrix |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::Row::PostAppend() { |
| basic_block = false; |
| prologue_end = false; |
| epilogue_begin = false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::Row::Reset |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::Row::Reset(bool default_is_stmt) { |
| address = 0; |
| line = 1; |
| column = 0; |
| file = 1; |
| is_stmt = default_is_stmt; |
| basic_block = false; |
| end_sequence = false; |
| prologue_end = false; |
| epilogue_begin = false; |
| isa = 0; |
| } |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::Row::Dump |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::Row::Dump(Log *log) const { |
| log->Printf("0x%16.16" PRIx64 " %6u %6u %6u %3u %s%s%s%s%s", address, line, |
| column, file, isa, is_stmt ? " is_stmt" : "", |
| basic_block ? " basic_block" : "", |
| prologue_end ? " prologue_end" : "", |
| epilogue_begin ? " epilogue_begin" : "", |
| end_sequence ? " end_sequence" : ""); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Compare function LineTable structures |
| //---------------------------------------------------------------------- |
| static bool AddressLessThan(const DWARFDebugLine::Row &a, |
| const DWARFDebugLine::Row &b) { |
| return a.address < b.address; |
| } |
| |
| // Insert a row at the correct address if the addresses can be out of order |
| // which can only happen when we are linking a line table that may have had |
| // it's contents rearranged. |
| void DWARFDebugLine::Row::Insert(Row::collection &state_coll, |
| const Row &state) { |
| // If we don't have anything yet, or if the address of the last state in our |
| // line table is less than the current one, just append the current state |
| if (state_coll.empty() || AddressLessThan(state_coll.back(), state)) { |
| state_coll.push_back(state); |
| } else { |
| // Do a binary search for the correct entry |
| pair<Row::iterator, Row::iterator> range(equal_range( |
| state_coll.begin(), state_coll.end(), state, AddressLessThan)); |
| |
| // If the addresses are equal, we can safely replace the previous entry |
| // with the current one if the one it is replacing is an end_sequence |
| // entry. We currently always place an extra end sequence when ever we exit |
| // a valid address range for a function in case the functions get |
| // rearranged by optimizations or by order specifications. These extra end |
| // sequences will disappear by getting replaced with valid consecutive |
| // entries within a compile unit if there are no gaps. |
| if (range.first == range.second) { |
| state_coll.insert(range.first, state); |
| } else { |
| if ((distance(range.first, range.second) == 1) && |
| range.first->end_sequence == true) { |
| *range.first = state; |
| } else { |
| state_coll.insert(range.second, state); |
| } |
| } |
| } |
| } |
| |
| void DWARFDebugLine::Row::Dump(Log *log, const Row::collection &state_coll) { |
| std::for_each(state_coll.begin(), state_coll.end(), |
| bind2nd(std::mem_fun_ref(&Row::Dump), log)); |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::State::State |
| //---------------------------------------------------------------------- |
| DWARFDebugLine::State::State(Prologue::shared_ptr &p, Log *l, |
| DWARFDebugLine::State::Callback cb, void *userData) |
| : Row(p->default_is_stmt), prologue(p), log(l), callback(cb), |
| callbackUserData(userData), row(StartParsingLineTable) { |
| // Call the callback with the initial row state of zero for the prologue |
| if (callback) |
| callback(0, *this, callbackUserData); |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::State::Reset |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::State::Reset() { Row::Reset(prologue->default_is_stmt); } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::State::AppendRowToMatrix |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::State::AppendRowToMatrix(dw_offset_t offset) { |
| // Each time we are to add an entry into the line table matrix call the |
| // callback function so that someone can do something with the current state |
| // of the state machine (like build a line table or dump the line table!) |
| if (log) { |
| if (row == 0) { |
| log->PutCString("Address Line Column File ISA Flags"); |
| log->PutCString( |
| "------------------ ------ ------ ------ --- -------------"); |
| } |
| Dump(log); |
| } |
| |
| ++row; // Increase the row number before we call our callback for a real row |
| if (callback) |
| callback(offset, *this, callbackUserData); |
| PostAppend(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // DWARFDebugLine::State::Finalize |
| //---------------------------------------------------------------------- |
| void DWARFDebugLine::State::Finalize(dw_offset_t offset) { |
| // Call the callback with a special row state when we are done parsing a line |
| // table |
| row = DoneParsingLineTable; |
| if (callback) |
| callback(offset, *this, callbackUserData); |
| } |
| |
| // void |
| // DWARFDebugLine::AppendLineTableData |
| //( |
| // const DWARFDebugLine::Prologue* prologue, |
| // const DWARFDebugLine::Row::collection& state_coll, |
| // const uint32_t addr_size, |
| // BinaryStreamBuf &debug_line_data |
| //) |
| //{ |
| // if (state_coll.empty()) |
| // { |
| // // We have no entries, just make an empty line table |
| // debug_line_data.Append8(0); |
| // debug_line_data.Append8(1); |
| // debug_line_data.Append8(DW_LNE_end_sequence); |
| // } |
| // else |
| // { |
| // DWARFDebugLine::Row::const_iterator pos; |
| // Row::const_iterator end = state_coll.end(); |
| // bool default_is_stmt = prologue->default_is_stmt; |
| // const DWARFDebugLine::Row reset_state(default_is_stmt); |
| // const DWARFDebugLine::Row* prev_state = &reset_state; |
| // const int32_t max_line_increment_for_special_opcode = |
| // prologue->MaxLineIncrementForSpecialOpcode(); |
| // for (pos = state_coll.begin(); pos != end; ++pos) |
| // { |
| // const DWARFDebugLine::Row& curr_state = *pos; |
| // int32_t line_increment = 0; |
| // dw_addr_t addr_offset = curr_state.address - prev_state->address; |
| // dw_addr_t addr_advance = (addr_offset) / prologue->min_inst_length; |
| // line_increment = (int32_t)(curr_state.line - prev_state->line); |
| // |
| // // If our previous state was the reset state, then let's emit the |
| // // address to keep GDB's DWARF parser happy. If we don't start each |
| // // sequence with a DW_LNE_set_address opcode, the line table won't |
| // // get slid properly in GDB. |
| // |
| // if (prev_state == &reset_state) |
| // { |
| // debug_line_data.Append8(0); // Extended opcode |
| // debug_line_data.Append32_as_ULEB128(addr_size + 1); // Length of |
| // opcode bytes |
| // debug_line_data.Append8(DW_LNE_set_address); |
| // debug_line_data.AppendMax64(curr_state.address, addr_size); |
| // addr_advance = 0; |
| // } |
| // |
| // if (prev_state->file != curr_state.file) |
| // { |
| // debug_line_data.Append8(DW_LNS_set_file); |
| // debug_line_data.Append32_as_ULEB128(curr_state.file); |
| // } |
| // |
| // if (prev_state->column != curr_state.column) |
| // { |
| // debug_line_data.Append8(DW_LNS_set_column); |
| // debug_line_data.Append32_as_ULEB128(curr_state.column); |
| // } |
| // |
| // // Don't do anything fancy if we are at the end of a sequence |
| // // as we don't want to push any extra rows since the |
| // DW_LNE_end_sequence |
| // // will push a row itself! |
| // if (curr_state.end_sequence) |
| // { |
| // if (line_increment != 0) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_line); |
| // debug_line_data.Append32_as_SLEB128(line_increment); |
| // } |
| // |
| // if (addr_advance > 0) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_pc); |
| // debug_line_data.Append32_as_ULEB128(addr_advance); |
| // } |
| // |
| // // Now push the end sequence on! |
| // debug_line_data.Append8(0); |
| // debug_line_data.Append8(1); |
| // debug_line_data.Append8(DW_LNE_end_sequence); |
| // |
| // prev_state = &reset_state; |
| // } |
| // else |
| // { |
| // if (line_increment || addr_advance) |
| // { |
| // if (line_increment > max_line_increment_for_special_opcode) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_line); |
| // debug_line_data.Append32_as_SLEB128(line_increment); |
| // line_increment = 0; |
| // } |
| // |
| // uint32_t special_opcode = (line_increment >= |
| // prologue->line_base) ? ((line_increment - |
| // prologue->line_base) + (prologue->line_range * addr_advance) |
| // + prologue->opcode_base) : 256; |
| // if (special_opcode > 255) |
| // { |
| // // Both the address and line won't fit in one special |
| // opcode |
| // // check to see if just the line advance will? |
| // uint32_t special_opcode_line = ((line_increment >= |
| // prologue->line_base) && (line_increment != 0)) ? |
| // ((line_increment - prologue->line_base) + |
| // prologue->opcode_base) : 256; |
| // |
| // |
| // if (special_opcode_line > 255) |
| // { |
| // // Nope, the line advance won't fit by itself, check |
| // the address increment by itself |
| // uint32_t special_opcode_addr = addr_advance ? |
| // ((0 - prologue->line_base) + |
| // (prologue->line_range * addr_advance) + |
| // prologue->opcode_base) : 256; |
| // |
| // if (special_opcode_addr > 255) |
| // { |
| // // Neither the address nor the line will fit in |
| // a |
| // // special opcode, we must manually enter both |
| // then |
| // // do a DW_LNS_copy to push a row (special |
| // opcode |
| // // automatically imply a new row is pushed) |
| // if (line_increment != 0) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_line); |
| // debug_line_data.Append32_as_SLEB128(line_increment); |
| // } |
| // |
| // if (addr_advance > 0) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_pc); |
| // debug_line_data.Append32_as_ULEB128(addr_advance); |
| // } |
| // |
| // // Now push a row onto the line table manually |
| // debug_line_data.Append8(DW_LNS_copy); |
| // |
| // } |
| // else |
| // { |
| // // The address increment alone will fit into a |
| // special opcode |
| // // so modify our line change, then issue a |
| // special opcode |
| // // for the address increment and it will push a |
| // row into the |
| // // line table |
| // if (line_increment != 0) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_line); |
| // debug_line_data.Append32_as_SLEB128(line_increment); |
| // } |
| // |
| // // Advance of line and address will fit into a |
| // single byte special opcode |
| // // and this will also push a row onto the line |
| // table |
| // debug_line_data.Append8(special_opcode_addr); |
| // } |
| // } |
| // else |
| // { |
| // // The line change alone will fit into a special |
| // opcode |
| // // so modify our address increment first, then issue |
| // a |
| // // special opcode for the line change and it will |
| // push |
| // // a row into the line table |
| // if (addr_advance > 0) |
| // { |
| // debug_line_data.Append8(DW_LNS_advance_pc); |
| // debug_line_data.Append32_as_ULEB128(addr_advance); |
| // } |
| // |
| // // Advance of line and address will fit into a |
| // single byte special opcode |
| // // and this will also push a row onto the line table |
| // debug_line_data.Append8(special_opcode_line); |
| // } |
| // } |
| // else |
| // { |
| // // Advance of line and address will fit into a single |
| // byte special opcode |
| // // and this will also push a row onto the line table |
| // debug_line_data.Append8(special_opcode); |
| // } |
| // } |
| // prev_state = &curr_state; |
| // } |
| // } |
| // } |
| //} |
