Hi tfiala,
"maximum_operations_per_instruction" is a field that was added to .debug_line
header in DWARF4.
http://reviews.llvm.org/D5533
Files:
source/Plugins/SymbolFile/DWARF/DWARFDebugLine.cpp
source/Plugins/SymbolFile/DWARF/DWARFDebugLine.h
Index: source/Plugins/SymbolFile/DWARF/DWARFDebugLine.cpp
===================================================================
--- source/Plugins/SymbolFile/DWARF/DWARFDebugLine.cpp
+++ source/Plugins/SymbolFile/DWARF/DWARFDebugLine.cpp
@@ -424,6 +424,8 @@
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);
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);
@@ -490,9 +492,12 @@
return false;
const dw_offset_t end_prologue_offset = debug_line_data.GetDWARFOffset(&offset) + offset;
- // Skip instruction length, default is stmt, line base, line range and
- // opcode base, and all opcode lengths
+ // Skip instruction length, default is stmt, line base, line range
offset += 4;
+ // For DWARF4, skip maximum operations per instruction
+ if (version >= 4)
+ offset += 1;
+ // Skip opcode base, and all opcode lengths
const uint8_t opcode_base = debug_line_data.GetU8(&offset);
offset += opcode_base - 1;
std::vector<std::string> include_directories;
Index: source/Plugins/SymbolFile/DWARF/DWARFDebugLine.h
===================================================================
--- source/Plugins/SymbolFile/DWARF/DWARFDebugLine.h
+++ source/Plugins/SymbolFile/DWARF/DWARFDebugLine.h
@@ -75,6 +75,7 @@
uint16_t version; // Version identifier for the statement information format.
uint32_t prologue_length;// The number of bytes following the prologue_length field to the beginning of the first byte of the statement program itself.
uint8_t min_inst_length;// The size in bytes of the smallest target machine instruction. Statement program opcodes that alter the address register first multiply their operands by this value.
+ uint8_t maximum_operations_per_instruction; // New in DWARF4. The maximum number of individual operations that may be encoded in an instruction.
uint8_t default_is_stmt;// The initial value of theis_stmtregister.
int8_t line_base; // This parameter affects the meaning of the special opcodes. See below.
uint8_t line_range; // This parameter affects the meaning of the special opcodes. See below.
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