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Fix DWARF debugging information on x86/Linux and (hopefully)

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Mingw32/Cygwin targets. This fixes PR978


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35000 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2007-03-07 02:47:57 +00:00
parent cb20998b3f
commit a6199c87c2
4 changed files with 80 additions and 17 deletions
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13
include/llvm/Target/TargetAsmInfo.h
View File

@ -246,6 +246,10 @@ namespace llvm {
//===--- Dwarf Emission Directives -----------------------------------===//
/// AbsoluteSectionOffsets - True if we should emit abolute section
/// offsets. Defaults to false.
bool AbsoluteSectionOffsets;
/// HasLEB128 - True if target asm supports leb128 directives.
///
bool HasLEB128; // Defaults to false.
@ -266,6 +270,9 @@ namespace llvm {
///
bool DwarfRequiresFrameSection; // Defaults to true.
/// DwarfSectionOffsetDirective - Special section offset directive.
const char* DwarfSectionOffsetDirective; // Defaults to NULL
/// DwarfAbbrevSection - Section directive for Dwarf abbrev.
///
const char *DwarfAbbrevSection; // Defaults to ".debug_abbrev".
@ -494,6 +501,9 @@ namespace llvm {
const char *getHiddenDirective() const {
return HiddenDirective;
}
bool isAbsoluteSectionOffsets() const {
return AbsoluteSectionOffsets;
}
bool hasLEB128() const {
return HasLEB128;
}
@ -509,6 +519,9 @@ namespace llvm {
bool getDwarfRequiresFrameSection() const {
return DwarfRequiresFrameSection;
}
const char *getDwarfSectionOffsetDirective() const {
return DwarfSectionOffsetDirective;
}
const char *getDwarfAbbrevSection() const {
return DwarfAbbrevSection;
}

78
lib/CodeGen/DwarfWriter.cpp
View File

@ -823,8 +823,12 @@ public:
void PrintLabelName(DWLabel Label) const {
PrintLabelName(Label.Tag, Label.Number);
}
void PrintLabelName(const char *Tag, unsigned Number) const {
O << TAI->getPrivateGlobalPrefix() << Tag;
void PrintLabelName(const char *Tag, unsigned Number,
bool isInSection = false) const {
if (isInSection && TAI->getDwarfSectionOffsetDirective())
O << TAI->getDwarfSectionOffsetDirective() << Tag;
else
O << TAI->getPrivateGlobalPrefix() << Tag;
if (Number) O << Number;
}
@ -907,7 +911,44 @@ public:
PrintLabelName(TagLo, NumberLo);
}
}
void EmitSectionOffset(const char* Label, const char* Section,
unsigned LabelNumber, unsigned SectionNumber,
bool IsSmall = false) const {
if (TAI->needsSet()) {
static unsigned SetCounter = 1;
O << "\t.set\t";
PrintLabelName("set", SetCounter);
O << ",";
PrintLabelName(Label, LabelNumber, true);
if (!TAI->isAbsoluteSectionOffsets()) {
O << "-";
PrintLabelName(Section, SectionNumber);
}
O << "\n";
if (IsSmall || TAI->getAddressSize() == sizeof(int32_t))
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
PrintLabelName("set", SetCounter);
++SetCounter;
} else {
if (IsSmall || TAI->getAddressSize() == sizeof(int32_t))
O << TAI->getData32bitsDirective();
else
O << TAI->getData64bitsDirective();
PrintLabelName(Label, LabelNumber, true);
if (!TAI->isAbsoluteSectionOffsets()) {
O << "-";
PrintLabelName(Section, SectionNumber);
}
}
}
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.
void EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
@ -1649,8 +1690,11 @@ private:
CompileUnit *NewCompileUnit(CompileUnitDesc *UnitDesc, unsigned ID) {
// Construct debug information entry.
DIE *Die = new DIE(DW_TAG_compile_unit);
AddDelta(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0),
DWLabel("section_line", 0));
if (TAI->isAbsoluteSectionOffsets())
AddLabel(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0));
else
AddDelta(Die, DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0),
DWLabel("section_line", 0));
AddString(Die, DW_AT_producer, DW_FORM_string, UnitDesc->getProducer());
AddUInt (Die, DW_AT_language, DW_FORM_data1, UnitDesc->getLanguage());
AddString(Die, DW_AT_name, DW_FORM_string, UnitDesc->getFileName());
@ -2065,7 +2109,7 @@ private:
Asm->EmitInt32(ContentSize); Asm->EOL("Length of Compilation Unit Info");
Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF version number");
EmitDifference("abbrev_begin", 0, "section_abbrev", 0, true);
EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true);
Asm->EOL("Offset Into Abbrev. Section");
Asm->EmitInt8(TAI->getAddressSize()); Asm->EOL("Address Size (in bytes)");
@ -2323,8 +2367,8 @@ private:
Asm->EOL("Length of Frame Information Entry");
EmitLabel("frame_begin", SubprogramCount);
EmitDifference("frame_common_begin", 0, "section_frame", 0, true);
EmitSectionOffset("frame_common_begin", "section_frame", 0, 0, true);
Asm->EOL("FDE CIE offset");
EmitReference("func_begin", SubprogramCount);
@ -2358,8 +2402,8 @@ private:
EmitLabel("pubnames_begin", Unit->getID());
Asm->EmitInt16(DWARF_VERSION); Asm->EOL("DWARF Version");
EmitDifference("info_begin", Unit->getID(), "section_info", 0, true);
EmitSectionOffset("info_begin", "section_info", Unit->getID(), 0, true);
Asm->EOL("Offset of Compilation Unit Info");
EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),true);
@ -2786,9 +2830,9 @@ private:
Asm->EOL("Length of Frame Information Entry");
EmitLabel("eh_frame_begin", SubprogramCount);
EmitDifference("eh_frame_begin", SubprogramCount,
"section_eh_frame", 0, true);
EmitSectionOffset("eh_frame_begin", "section_eh_frame",
SubprogramCount, 0, true);
Asm->EOL("FDE CIE offset");
EmitReference("eh_func_begin", SubprogramCount, true);
@ -2951,8 +2995,8 @@ private:
// Emit the landng pad site information.
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
const LandingPadInfo &LandingPad = LandingPads[i];
EmitDifference("label", LandingPad.BeginLabel,
"eh_func_begin", SubprogramCount);
EmitSectionOffset("label", "eh_func_begin",
LandingPad.BeginLabel, SubprogramCount);
Asm->EOL("Region start");
EmitDifference("label", LandingPad.EndLabel,
@ -2965,8 +3009,8 @@ private:
else
Asm->EmitInt64(0);
} else {
EmitDifference("label", LandingPad.LandingPadLabel,
"eh_func_begin", SubprogramCount);
EmitSectionOffset("label", "eh_func_begin",
LandingPad.LandingPadLabel, SubprogramCount);
}
Asm->EOL("Landing pad");

3
lib/Target/TargetAsmInfo.cpp
View File

@ -69,11 +69,13 @@ TargetAsmInfo::TargetAsmInfo() :
UsedDirective(0),
WeakRefDirective(0),
HiddenDirective("\t.hidden\t"),
AbsoluteSectionOffsets(false),
HasLEB128(false),
HasDotLoc(false),
HasDotFile(false),
SupportsExceptionHandling(false),
DwarfRequiresFrameSection(true),
DwarfSectionOffsetDirective(0),
DwarfAbbrevSection(".debug_abbrev"),
DwarfInfoSection(".debug_info"),
DwarfLineSection(".debug_line"),
@ -106,3 +108,4 @@ unsigned TargetAsmInfo::getInlineAsmLength(const char *Str) const {
// Multiply by the worst-case length for each instruction.
return NumInsts * MaxInstLength;
}

3
lib/Target/X86/X86TargetAsmInfo.cpp
View File

@ -97,6 +97,7 @@ X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
case X86Subtarget::isELF:
// Set up DWARF directives
HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
AbsoluteSectionOffsets = true;
// bool HasLEB128; // Defaults to false.
// hasDotLoc - True if target asm supports .loc directives.
// bool HasDotLoc; // Defaults to false.
@ -130,9 +131,11 @@ X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
// Set up DWARF directives
HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
AbsoluteSectionOffsets = true;
PrivateGlobalPrefix = "L"; // Prefix for private global symbols
WeakRefDirective = "\t.weak\t";
DwarfRequiresFrameSection = false;
DwarfSectionOffsetDirective = "\t.secrel32\t";
DwarfAbbrevSection = "\t.section\t.debug_abbrev,\"dr\"";
DwarfInfoSection = "\t.section\t.debug_info,\"dr\"";
DwarfLineSection = "\t.section\t.debug_line,\"dr\"";