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MC: Add support for disabling "temporary label" behavior. Useful for debugging

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on Darwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128430 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2011-03-28 22:49:15 +00:00
parent cede7c0551
commit c6cf43d258
4 changed files with 52 additions and 3 deletions
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7
include/llvm/MC/MCContext.h
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@ -84,6 +84,11 @@ namespace llvm {
MCDwarfLoc CurrentDwarfLoc;
bool DwarfLocSeen;
/// Honor temporary labels, this is useful for debugging semantic
/// differences between temporary and non-temporary labels (primarily on
/// Darwin).
bool AllowTemporaryLabels;
/// The dwarf line information from the .loc directives for the sections
/// with assembled machine instructions have after seeing .loc directives.
DenseMap<const MCSection *, MCLineSection *> MCLineSections;
@ -109,6 +114,8 @@ namespace llvm {
const TargetAsmInfo &getTargetAsmInfo() const { return *TAI; }
void setAllowTemporaryLabels(bool Value) { AllowTemporaryLabels = Value; }
/// @name Symbol Management
/// @{

9
lib/MC/MCContext.cpp
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@ -28,7 +28,8 @@ typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
MCContext::MCContext(const MCAsmInfo &mai, const TargetAsmInfo *tai) :
MAI(mai), TAI(tai), NextUniqueID(0),
CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0) {
CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0),
AllowTemporaryLabels(true) {
MachOUniquingMap = 0;
ELFUniquingMap = 0;
COFFUniquingMap = 0;
@ -76,8 +77,10 @@ MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) {
}
MCSymbol *MCContext::CreateSymbol(StringRef Name) {
// Determine whether this is an assembler temporary or normal label.
bool isTemporary = Name.startswith(MAI.getPrivateGlobalPrefix());
// Determine whether this is an assembler temporary or normal label, if used.
bool isTemporary = false;
if (AllowTemporaryLabels)
isTemporary = Name.startswith(MAI.getPrivateGlobalPrefix());
StringMapEntry<bool> *NameEntry = &UsedNames.GetOrCreateValue(Name);
if (NameEntry->getValue()) {

33
test/MC/MachO/temp-labels.s Normal file
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@ -0,0 +1,33 @@
// RUN: llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -L -o - | macho-dump --dump-section-data | FileCheck %s
// CHECK: # Load Command 1
// CHECK: (('command', 2)
// CHECK: ('size', 24)
// CHECK: ('symoff', 296)
// CHECK: ('nsyms', 2)
// CHECK: ('stroff', 328)
// CHECK: ('strsize', 8)
// CHECK: ('_string_data', '\x00_f0\x00L0\x00')
// CHECK: ('_symbols', [
// CHECK: # Symbol 0
// CHECK: (('n_strx', 1)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 1)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 0)
// CHECK: ('_string', '_f0')
// CHECK: ),
// CHECK: # Symbol 1
// CHECK: (('n_strx', 5)
// CHECK: ('n_type', 0xe)
// CHECK: ('n_sect', 1)
// CHECK: ('n_desc', 0)
// CHECK: ('n_value', 4)
// CHECK: ('_string', 'L0')
// CHECK: ),
// CHECK: ])
// CHECK: ),
_f0:
.long 0
L0:
.long 0

6
tools/llvm-mc/llvm-mc.cpp
View File

@ -113,6 +113,10 @@ static cl::opt<bool>
NoInitialTextSection("n", cl::desc(
"Don't assume assembly file starts in the text section"));
static cl::opt<bool>
SaveTempLabels("L", cl::desc(
"Don't discard temporary labels"));
enum ActionType {
AC_AsLex,
AC_Assemble,
@ -327,6 +331,8 @@ static int AssembleInput(const char *ProgName) {
const TargetAsmInfo *tai = new TargetAsmInfo(*TM);
MCContext Ctx(*MAI, tai);
if (SaveTempLabels)
Ctx.setAllowTemporaryLabels(false);
OwningPtr<tool_output_file> Out(GetOutputStream());
if (!Out)