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Remove what looks like dead code in the production of debug lines.

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We only produce debug line information if we have seen a line directive, so
this code is dead. Also, if we want to be bug by bug compatible with
gas and sometimes produce "empty" .debug_line sections, this will
match the content produced by gas.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118914 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-11-12 18:41:26 +00:00
parent f06202f8e8
commit bac0ad9eda
1 changed files with 2 additions and 45 deletions
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47
lib/MC/MCDwarf.cpp
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@ -135,7 +135,7 @@ static inline void EmitDwarfSetAddress(MCObjectStreamer *MCOS,
// This emits the Dwarf line table for the specified section from the entries
// in the LineSection.
//
static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
const MCSection *Section,
MCLineSection *LineSection,
const MCSection *DwarfLineSection) {
@ -144,7 +144,6 @@ static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
unsigned Column = 0;
unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
unsigned Isa = 0;
bool EmittedLineTable = false;
MCSymbol *LastLabel = NULL;
MCSectionData &DLS =
MCOS->getAssembler().getOrCreateSectionData(*DwarfLineSection);
@ -202,7 +201,6 @@ static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
LastLine = it->getLine();
LastLabel = Label;
EmittedLineTable = true;
}
// Emit a DW_LNE_end_sequence for the end of the section.
@ -226,8 +224,6 @@ static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
0);
// Create a Dwarf Line fragment for the LineDelta and AddrDelta.
new MCDwarfLineAddrFragment(INT64_MAX, *AddrDelta, &DLS);
return EmittedLineTable;
}
//
@ -315,56 +311,17 @@ void MCDwarfFileTable::Emit(MCObjectStreamer *MCOS,
MCOS->EmitLabel(ProEndSym);
// Put out the line tables.
bool EmittedLineTable = false;
DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
MCOS->getContext().getMCLineSections();
for (DenseMap<const MCSection *, MCLineSection *>::iterator it =
MCLineSections.begin(), ie = MCLineSections.end(); it != ie; ++it) {
EmittedLineTable = EmitDwarfLineTable(MCOS, it->first, it->second,
DwarfLineSection);
EmitDwarfLineTable(MCOS, it->first, it->second, DwarfLineSection);
// Now delete the MCLineSections that were created in MCLineEntry::Make()
// and used to emit the line table.
delete it->second;
}
// If there are no line tables emited then we emit:
// The following DW_LNE_set_address sequence to set the address to zero and
// the DW_LNE_end_sequence.
if (EmittedLineTable == false) {
if (MCOS->getAssembler().getBackend().getPointerSize() == 8) {
// This is the DW_LNE_set_address sequence for 64-bit code.
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(9, 1);
MCOS->EmitIntValue(2, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
}
else {
// This is the DW_LNE_set_address sequence for 32-bit code.
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(5, 1);
MCOS->EmitIntValue(2, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
}
// Lastly emit the DW_LNE_end_sequence which consists of 3 bytes '00 01 01'
// (00 is the code for extended opcodes, followed by a ULEB128 length of the
// extended opcode (01), and the DW_LNE_end_sequence (01).
MCOS->EmitIntValue(0, 1); // DW_LNS_extended_op
MCOS->EmitIntValue(1, 1); // ULEB128 length of the extended opcode
MCOS->EmitIntValue(1, 1); // DW_LNE_end_sequence
}
// This is the end of the section, so set the value of the symbol at the end
// of this section (that was used in a previous expression).
MCOS->EmitLabel(LineEndSym);