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Add support for separating strings for the split debug info DWARF5

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proposal. This leaves the strings in the skeleton die as strp,
but in all dwo files they're accessed now via DW_FORM_GNU_str_index.

Add support for dumping these sections and modify the fission-cu.ll
testcase to have the correct strings and form. Fix a small bug
in the fixed form sizes routine that involved out of array accesses
for the table and add a FIXME in the extractFast routine to fix
this up.

llvm-svn: 171779
This commit is contained in:
Eric Christopher 2013-01-07 19:32:41 +00:00
parent 250d836387
commit ba738518f0
12 changed files with 120 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/CodeGen/AsmPrinter/DIE.cpp
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@ -197,6 +197,7 @@ void DIEInteger::EmitValue(AsmPrinter *Asm, unsigned Form) const {
case dwarf::DW_FORM_data4: Size = 4; break;
case dwarf::DW_FORM_ref8: // Fall thru
case dwarf::DW_FORM_data8: Size = 8; break;
case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
case dwarf::DW_FORM_addr:
@ -220,6 +221,7 @@ unsigned DIEInteger::SizeOf(AsmPrinter *AP, unsigned Form) const {
case dwarf::DW_FORM_data4: return sizeof(int32_t);
case dwarf::DW_FORM_ref8: // Fall thru
case dwarf::DW_FORM_data8: return sizeof(int64_t);
case dwarf::DW_FORM_GNU_str_index: return MCAsmInfo::getULEB128Size(Integer);
case dwarf::DW_FORM_udata: return MCAsmInfo::getULEB128Size(Integer);
case dwarf::DW_FORM_sdata: return MCAsmInfo::getSLEB128Size(Integer);
case dwarf::DW_FORM_addr: return AP->getDataLayout().getPointerSize();

21
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
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@ -128,6 +128,27 @@ void CompileUnit::addSInt(DIE *Die, unsigned Attribute,
/// reference to the string pool instead of immediate strings so that DIEs have
/// more predictable sizes.
void CompileUnit::addString(DIE *Die, unsigned Attribute, StringRef String) {
if (!DD->useSplitDwarf()) {
MCSymbol *Symb = DU->getStringPoolEntry(String);
DIEValue *Value;
if (Asm->needsRelocationsForDwarfStringPool())
Value = new (DIEValueAllocator) DIELabel(Symb);
else {
MCSymbol *StringPool = DU->getStringPoolSym();
Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
}
Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
} else {
unsigned idx = DU->getStringPoolIndex(String);
DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
Die->addValue(Attribute, dwarf::DW_FORM_GNU_str_index, Value);
}
}
/// addLocalString - Add a string attribute data and value. This is guaranteed
/// to be in the local string pool instead of indirected.
void CompileUnit::addLocalString(DIE *Die, unsigned Attribute,
StringRef String) {
MCSymbol *Symb = DU->getStringPoolEntry(String);
DIEValue *Value;
if (Asm->needsRelocationsForDwarfStringPool())

4
lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
View File

@ -198,6 +198,10 @@ public:
///
void addString(DIE *Die, unsigned Attribute, const StringRef Str);
/// addLocalString - Add a string attribute data and value.
///
void addLocalString(DIE *Die, unsigned Attribute, const StringRef Str);
/// addLabel - Add a Dwarf label attribute data and value.
///
void addLabel(DIE *Die, unsigned Attribute, unsigned Form,

36
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -228,6 +228,16 @@ MCSymbol *DwarfUnits::getStringPoolEntry(StringRef Str) {
return Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
}
unsigned DwarfUnits::getStringPoolIndex(StringRef Str) {
std::pair<MCSymbol*, unsigned> &Entry =
StringPool->GetOrCreateValue(Str).getValue();
if (Entry.first) return Entry.second;
Entry.second = NextStringPoolNumber++;
Entry.first = Asm->GetTempSymbol(StringPref, Entry.second);
return Entry.second;
}
// Define a unique number for the abbreviation.
//
void DwarfUnits::assignAbbrevNumber(DIEAbbrev &Abbrev) {
@ -2116,12 +2126,14 @@ void DwarfDebug::emitDebugPubTypes() {
}
// Emit strings into a string section.
void DwarfUnits::emitStrings(const MCSection *Section) {
void DwarfUnits::emitStrings(const MCSection *StrSection,
const MCSection *OffsetSection = NULL,
const MCSymbol *StrSecSym = NULL) {
if (StringPool->empty()) return;
// Start the dwarf str section.
Asm->OutStreamer.SwitchSection(Section);
Asm->OutStreamer.SwitchSection(StrSection);
// Get all of the string pool entries and put them in an array by their ID so
// we can sort them.
@ -2144,6 +2156,17 @@ void DwarfUnits::emitStrings(const MCSection *Section) {
Entries[i].second->getKeyLength()+1),
0/*addrspace*/);
}
// If we've got an offset section go ahead and emit that now as well.
if (OffsetSection) {
Asm->OutStreamer.SwitchSection(OffsetSection);
unsigned offset = 0;
unsigned size = 4;
for (unsigned i = 0, e = Entries.size(); i != e; ++i) {
Asm->OutStreamer.EmitIntValue(offset, size, 0);
offset += Entries[i].second->getKeyLength() + 1;
}
}
}
// Emit visible names into a debug str section.
@ -2377,7 +2400,7 @@ CompileUnit *DwarfDebug::constructSkeletonCU(const MDNode *N) {
DIUnit.getLanguage(), Die, Asm,
this, &SkeletonHolder);
// FIXME: This should be the .dwo file.
NewCU->addString(Die, dwarf::DW_AT_GNU_dwo_name, FN);
NewCU->addLocalString(Die, dwarf::DW_AT_GNU_dwo_name, FN);
// FIXME: We also need DW_AT_addr_base and DW_AT_dwo_id.
@ -2393,7 +2416,7 @@ CompileUnit *DwarfDebug::constructSkeletonCU(const MDNode *N) {
NewCU->addUInt(Die, dwarf::DW_AT_stmt_list, dwarf::DW_FORM_data4, 0);
if (!CompilationDir.empty())
NewCU->addString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
NewCU->addLocalString(Die, dwarf::DW_AT_comp_dir, CompilationDir);
SkeletonHolder.addUnit(NewCU);
@ -2458,5 +2481,8 @@ void DwarfDebug::emitDebugAbbrevDWO() {
// sections.
void DwarfDebug::emitDebugStrDWO() {
assert(useSplitDwarf() && "No split dwarf?");
InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection());
const MCSection *OffSec = Asm->getObjFileLowering().getDwarfStrOffDWOSection();
const MCSymbol *StrSym = DwarfStrSectionSym;
InfoHolder.emitStrings(Asm->getObjFileLowering().getDwarfStrDWOSection(),
OffSec, StrSym);
}

6
lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -240,7 +240,7 @@ public:
const MCSymbol *);
/// \brief Emit all of the strings to the section given.
void emitStrings(const MCSection *);
void emitStrings(const MCSection *, const MCSection *, const MCSymbol *);
/// \brief Returns the entry into the start of the pool.
MCSymbol *getStringPoolSym();
@ -249,6 +249,10 @@ public:
/// string text.
MCSymbol *getStringPoolEntry(StringRef Str);
/// \brief Returns the index into the string pool with the given
/// string text.
unsigned getStringPoolIndex(StringRef Str);
/// \brief Returns the string pool.
StrPool *getStringPool() { return StringPool; }
};

8
lib/DebugInfo/DWARFCompileUnit.h
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@ -28,6 +28,7 @@ class DWARFCompileUnit {
StringRef AbbrevSection;
StringRef RangeSection;
StringRef StringSection;
StringRef StringOffsetSection;
const RelocAddrMap *RelocMap;
bool isLittleEndian;
@ -42,13 +43,16 @@ class DWARFCompileUnit {
public:
DWARFCompileUnit(const DWARFDebugAbbrev *DA, StringRef IS, StringRef AS,
StringRef RS, StringRef SS, const RelocAddrMap *M, bool LE) :
StringRef RS, StringRef SS, StringRef SOS,
const RelocAddrMap *M, bool LE) :
Abbrev(DA), InfoSection(IS), AbbrevSection(AS),
RangeSection(RS), StringSection(SS), RelocMap(M), isLittleEndian(LE) {
RangeSection(RS), StringSection(SS), StringOffsetSection(SOS),
RelocMap(M), isLittleEndian(LE) {
clear();
}
StringRef getStringSection() const { return StringSection; }
StringRef getStringOffsetSection() const { return StringOffsetSection; }
const RelocAddrMap *getRelocMap() const { return RelocMap; }
DataExtractor getDebugInfoExtractor() const;

6
lib/DebugInfo/DWARFContext.cpp
View File

@ -152,7 +152,8 @@ void DWARFContext::parseCompileUnits() {
while (DIData.isValidOffset(offset)) {
CUs.push_back(DWARFCompileUnit(getDebugAbbrev(), getInfoSection(),
getAbbrevSection(), getRangeSection(),
getStringSection(), &infoRelocMap(),
getStringSection(), "",
&infoRelocMap(),
isLittleEndian()));
if (!CUs.back().extract(DIData, &offset)) {
CUs.pop_back();
@ -172,6 +173,7 @@ void DWARFContext::parseDWOCompileUnits() {
getAbbrevDWOSection(),
getRangeDWOSection(),
getStringDWOSection(),
getStringOffsetDWOSection(),
&infoDWORelocMap(),
isLittleEndian()));
if (!DWOCUs.back().extract(DIData, &offset)) {
@ -382,6 +384,8 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
AbbrevDWOSection = data;
else if (name == "debug_str.dwo")
StringDWOSection = data;
else if (name == "debug_str_offsets.dwo")
StringOffsetDWOSection = data;
// Any more debug info sections go here.
else
continue;

5
lib/DebugInfo/DWARFContext.h
View File

@ -106,6 +106,7 @@ public:
virtual StringRef getInfoDWOSection() = 0;
virtual StringRef getAbbrevDWOSection() = 0;
virtual StringRef getStringDWOSection() = 0;
virtual StringRef getStringOffsetDWOSection() = 0;
virtual StringRef getRangeDWOSection() = 0;
virtual const RelocAddrMap &infoDWORelocMap() const = 0;
@ -140,6 +141,7 @@ class DWARFContextInMemory : public DWARFContext {
StringRef InfoDWOSection;
StringRef AbbrevDWOSection;
StringRef StringDWOSection;
StringRef StringOffsetDWOSection;
StringRef RangeDWOSection;
public:
@ -157,6 +159,9 @@ public:
virtual StringRef getInfoDWOSection() { return InfoDWOSection; }
virtual StringRef getAbbrevDWOSection() { return AbbrevDWOSection; }
virtual StringRef getStringDWOSection() { return StringDWOSection; }
virtual StringRef getStringOffsetDWOSection() {
return StringOffsetDWOSection;
}
virtual StringRef getRangeDWOSection() { return RangeDWOSection; }
virtual const RelocAddrMap &infoDWORelocMap() const { return InfoDWORelocMap; }
};

13
lib/DebugInfo/DWARFDebugInfoEntry.cpp
View File

@ -12,6 +12,7 @@
#include "DWARFContext.h"
#include "DWARFDebugAbbrev.h"
#include "DWARFFormValue.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
@ -113,9 +114,14 @@ bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *cu,
uint32_t i;
uint16_t form;
for (i=0; i<numAttributes; ++i) {
form = AbbrevDecl->getFormByIndex(i);
const uint8_t fixed_skip_size = fixed_form_sizes[form];
// FIXME: Currently we're checking if this is less than the last
// entry in the fixed_form_sizes table, but this should be changed
// to use dynamic dispatch.
const uint8_t fixed_skip_size = (form < DW_FORM_ref_sig8) ?
fixed_form_sizes[form] : 0;
if (fixed_skip_size)
offset += fixed_skip_size;
else {
@ -187,6 +193,8 @@ bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *cu,
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_addr_index:
debug_info_data.getULEB128(&offset);
break;
@ -207,7 +215,6 @@ bool DWARFDebugInfoEntryMinimal::extractFast(const DWARFCompileUnit *cu,
return false;
}
offset += form_size;
} while (form_is_indirect);
}
}
@ -327,6 +334,8 @@ DWARFDebugInfoEntryMinimal::extract(const DWARFCompileUnit *cu,
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_addr_index:
debug_info_data.getULEB128(&offset);
break;

28
lib/DebugInfo/DWARFFormValue.cpp
View File

@ -46,8 +46,6 @@ static const uint8_t form_sizes_addr4[] = {
0, // 0x18 DW_FORM_exprloc
0, // 0x19 DW_FORM_flag_present
8, // 0x20 DW_FORM_ref_sig8
4, // 0x1f01 DW_FORM_GNU_addr_index
4, // 0x1f02 DW_FORM_GNU_str_index
};
static const uint8_t form_sizes_addr8[] = {
@ -78,8 +76,6 @@ static const uint8_t form_sizes_addr8[] = {
0, // 0x18 DW_FORM_exprloc
0, // 0x19 DW_FORM_flag_present
8, // 0x20 DW_FORM_ref_sig8
8, // 0x1f01 DW_FORM_GNU_addr_index
8, // 0x1f01 DW_FORM_GNU_str_index
};
const uint8_t *
@ -295,6 +291,8 @@ DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
case DW_FORM_sdata:
case DW_FORM_udata:
case DW_FORM_ref_udata:
case DW_FORM_GNU_str_index:
case DW_FORM_GNU_addr_index:
debug_info_data.getULEB128(offset_ptr);
return true;
@ -321,6 +319,7 @@ DWARFFormValue::skipValue(uint16_t form, DataExtractor debug_info_data,
void
DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const {
DataExtractor debug_str_data(cu->getStringSection(), true, 0);
DataExtractor debug_str_offset_data(cu->getStringOffsetSection(), true, 0);
uint64_t uvalue = getUnsigned();
bool cu_relative_offset = false;
@ -379,6 +378,17 @@ DWARFFormValue::dump(raw_ostream &OS, const DWARFCompileUnit *cu) const {
}
break;
}
case DW_FORM_GNU_str_index: {
OS << format(" indexed (%8.8x) string = ", (uint32_t)uvalue);
const char *dbg_str = getIndirectCString(&debug_str_data,
&debug_str_offset_data);
if (dbg_str) {
OS << '"';
OS.write_escaped(dbg_str);
OS << '"';
}
break;
}
case DW_FORM_ref_addr:
OS << format("0x%016" PRIx64, uvalue);
break;
@ -436,6 +446,16 @@ DWARFFormValue::getAsCString(const DataExtractor *debug_str_data_ptr) const {
return NULL;
}
const char*
DWARFFormValue::getIndirectCString(const DataExtractor *DS,
const DataExtractor *DSO) const {
if (!DS || !DSO) return NULL;
uint32_t offset = Value.uval * 4;
uint32_t soffset = DSO->getULEB128(&offset);
return DS->getCStr(&soffset);
}
uint64_t DWARFFormValue::getReference(const DWARFCompileUnit *cu) const {
uint64_t die_offset = Value.uval;
switch (Form) {

2
lib/DebugInfo/DWARFFormValue.h
View File

@ -64,6 +64,8 @@ public:
uint64_t getUnsigned() const { return Value.uval; }
int64_t getSigned() const { return Value.sval; }
const char *getAsCString(const DataExtractor *debug_str_data_ptr) const;
const char *getIndirectCString(const DataExtractor *,
const DataExtractor *) const;
bool skipValue(DataExtractor debug_info_data, uint32_t *offset_ptr,
const DWARFCompileUnit *cu) const;
static bool skipValue(uint16_t form, DataExtractor debug_info_data,

8
test/DebugInfo/X86/fission-cu.ll
View File

@ -30,10 +30,10 @@
; FIXME: Strings will ultimately be a different form.
; CHECK: .debug_info.dwo contents:
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_producer [DW_FORM_strp]
; CHECK: DW_AT_producer [DW_FORM_GNU_str_index] ( indexed (00000000) string = "clang version 3.3 (trunk 169021) (llvm/trunk 169020)")
; CHECK: DW_AT_language [DW_FORM_data2] (0x000c)
; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000035] = "baz.c")
; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000001) string = "baz.c")
; CHECK: DW_TAG_base_type
; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000061] = "int")
; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000004) string = "int")
; CHECK: DW_TAG_variable
; CHECK: DW_AT_name [DW_FORM_strp] ( .debug_str[0x0000005f] = "a")
; CHECK: DW_AT_name [DW_FORM_GNU_str_index] ( indexed (00000003) string = "a")