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Change some methods in MCDwarf.cpp to be able to handle an arbitrary

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MCStreamer instead of just MCObjectStreamer. Address changes cannot
be as efficient as we have to use DW_LNE_set_addres, but at least
most of the logic is shared.

This will be used so that, with CodeGen still using EmitDwarfLocDirective,
llvm-gcc is able to produce debug_line sections without needing an
assembler that supports .loc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119777 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-11-19 02:26:16 +00:00
parent 602890dd8e
commit 195a0ce484
9 changed files with 128 additions and 43 deletions
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7
include/llvm/MC/MCDwarf.h
View File

@ -167,7 +167,7 @@ namespace llvm {
// This is called when an instruction is assembled into the specified
// section and if there is information from the last .loc directive that
// has yet to have a line entry made for it is made.
static void Make(MCObjectStreamer *MCOS, const MCSection *Section);
static void Make(MCStreamer *MCOS, const MCSection *Section);
};
/// MCLineSection - Instances of this class represent the line information
@ -205,7 +205,8 @@ namespace llvm {
//
// This emits the Dwarf file and the line tables.
//
static void Emit(MCObjectStreamer *MCOS, const MCSection *DwarfLineSection);
static void Emit(MCStreamer *MCOS, const MCSection *DwarfLineSection,
MCSectionData *DLS, int PointerSize);
};
class MCDwarfLineAddr {
@ -214,7 +215,7 @@ namespace llvm {
static void Encode(int64_t LineDelta, uint64_t AddrDelta, raw_ostream &OS);
/// Utility function to emit the encoding to a streamer.
static void Emit(MCObjectStreamer *MCOS,
static void Emit(MCStreamer *MCOS,
int64_t LineDelta,uint64_t AddrDelta);
/// Utility function to compute the size of the encoding.

9
include/llvm/MC/MCStreamer.h
View File

@ -28,6 +28,7 @@ namespace llvm {
class MCSymbol;
class StringRef;
class TargetAsmBackend;
class TargetLoweringObjectFile;
class Twine;
class raw_ostream;
class formatted_raw_ostream;
@ -388,6 +389,14 @@ namespace llvm {
MCCodeEmitter *CE = 0,
bool ShowInst = false);
MCStreamer *createAsmStreamerNoLoc(MCContext &Ctx, formatted_raw_ostream &OS,
bool isLittleEndian, bool isVerboseAsm,
const TargetLoweringObjectFile *TLOF,
int PointerSize,
MCInstPrinter *InstPrint = 0,
MCCodeEmitter *CE = 0,
bool ShowInst = false);
/// createMachOStreamer - Create a machine code streamer which will generate
/// Mach-O format object files.
///

7
include/llvm/Target/TargetMachine.h
View File

@ -104,6 +104,7 @@ protected: // Can only create subclasses.
const MCAsmInfo *AsmInfo;
unsigned MCRelaxAll : 1;
unsigned MCUseLoc : 1;
public:
virtual ~TargetMachine();
@ -169,6 +170,12 @@ public:
/// relaxed.
void setMCRelaxAll(bool Value) { MCRelaxAll = Value; }
/// hasMCUseLoc - Check whether we should use dwarf's .loc directive.
bool hasMCUseLoc() const { return MCUseLoc; }
/// setMCUseLoc - Set whether all we should use dwarf's .loc directive.
void setMCUseLoc(bool Value) { MCUseLoc = Value; }
/// getRelocationModel - Returns the code generation relocation model. The
/// choices are static, PIC, and dynamic-no-pic, and target default.
static Reloc::Model getRelocationModel();

28
lib/CodeGen/LLVMTargetMachine.cpp
View File

@ -20,6 +20,7 @@
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
@ -144,11 +145,28 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
if (ShowMCEncoding)
MCE = getTarget().createCodeEmitter(*this, *Context);
AsmStreamer.reset(getTarget().createAsmStreamer(*Context, Out,
getTargetData()->isLittleEndian(),
getVerboseAsm(),
InstPrinter, MCE,
ShowMCInst));
const TargetLoweringObjectFile &TLOF =
getTargetLowering()->getObjFileLowering();
int PointerSize = getTargetData()->getPointerSize();
MCStreamer *S;
if (hasMCUseLoc())
S = getTarget().createAsmStreamer(*Context, Out,
getTargetData()->isLittleEndian(),
getVerboseAsm(),
InstPrinter,
MCE,
ShowMCInst);
else
S = createAsmStreamerNoLoc(*Context, Out,
getTargetData()->isLittleEndian(),
getVerboseAsm(),
&TLOF,
PointerSize,
InstPrinter,
MCE,
ShowMCInst);
AsmStreamer.reset(S);
break;
}
case CGFT_ObjectFile: {

48
lib/MC/MCAsmStreamer.cpp
View File

@ -23,6 +23,7 @@
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
using namespace llvm;
namespace {
@ -36,16 +37,21 @@ class MCAsmStreamer : public MCStreamer {
SmallString<128> CommentToEmit;
raw_svector_ostream CommentStream;
const TargetLoweringObjectFile *TLOF;
int PointerSize;
unsigned IsLittleEndian : 1;
unsigned IsVerboseAsm : 1;
unsigned ShowInst : 1;
public:
MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
bool isLittleEndian, bool isVerboseAsm, MCInstPrinter *printer,
MCCodeEmitter *emitter, bool showInst)
bool isLittleEndian, bool isVerboseAsm,
const TargetLoweringObjectFile *tlof, int pointerSize,
MCInstPrinter *printer, MCCodeEmitter *emitter, bool showInst)
: MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
TLOF(tlof), PointerSize(pointerSize),
IsLittleEndian(isLittleEndian), IsVerboseAsm(isVerboseAsm),
ShowInst(showInst) {
if (InstPrinter && IsVerboseAsm)
@ -637,9 +643,11 @@ void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
}
bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
OS << "\t.file\t" << FileNo << ' ';
PrintQuotedString(Filename, OS);
EmitEOL();
if (!TLOF) {
OS << "\t.file\t" << FileNo << ' ';
PrintQuotedString(Filename, OS);
EmitEOL();
}
return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
}
@ -647,6 +655,11 @@ void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa,
unsigned Discriminator) {
this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
Isa, Discriminator);
if (TLOF)
return;
OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
if (Flags & DWARF2_FLAG_BASIC_BLOCK)
OS << " basic_block";
@ -670,8 +683,6 @@ void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
if (Discriminator)
OS << "discriminator " << Discriminator;
EmitEOL();
return this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
Isa, Discriminator);
}
void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
@ -755,6 +766,9 @@ void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
assert(CurSection && "Cannot emit contents before setting section!");
if (TLOF)
MCLineEntry::Make(this, getCurrentSection());
// Show the encoding in a comment if we have a code emitter.
if (Emitter)
AddEncodingComment(Inst);
@ -784,6 +798,11 @@ void MCAsmStreamer::EmitRawText(StringRef String) {
}
void MCAsmStreamer::Finish() {
// Dump out the dwarf file & directory tables and line tables.
if (getContext().hasDwarfFiles() && TLOF) {
MCDwarfFileTable::Emit(this, TLOF->getDwarfLineSection(), NULL,
PointerSize);
}
}
MCStreamer *llvm::createAsmStreamer(MCContext &Context,
@ -792,5 +811,18 @@ MCStreamer *llvm::createAsmStreamer(MCContext &Context,
bool isVerboseAsm, MCInstPrinter *IP,
MCCodeEmitter *CE, bool ShowInst) {
return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
IP, CE, ShowInst);
NULL, 0, IP, CE, ShowInst);
}
MCStreamer *llvm::createAsmStreamerNoLoc(MCContext &Context,
formatted_raw_ostream &OS,
bool isLittleEndian,
bool isVerboseAsm,
const TargetLoweringObjectFile *TLOF,
int PointerSize,
MCInstPrinter *IP,
MCCodeEmitter *CE, bool ShowInst) {
return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
TLOF, PointerSize, IP, CE, ShowInst);
}

59
lib/MC/MCDwarf.cpp
View File

@ -60,7 +60,7 @@ static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta)
// and if there is information from the last .loc directive that has yet to have
// a line entry made for it is made.
//
void MCLineEntry::Make(MCObjectStreamer *MCOS, const MCSection *Section) {
void MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) {
if (!MCOS->getContext().getDwarfLocSeen())
return;
@ -99,7 +99,7 @@ void MCLineEntry::Make(MCObjectStreamer *MCOS, const MCSection *Section) {
//
// This helper routine returns an expression of End - Start + IntVal .
//
static inline const MCExpr *MakeStartMinusEndExpr(MCObjectStreamer *MCOS,
static inline const MCExpr *MakeStartMinusEndExpr(MCStreamer *MCOS,
MCSymbol *Start,
MCSymbol *End, int IntVal) {
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
@ -120,33 +120,33 @@ static inline const MCExpr *MakeStartMinusEndExpr(MCObjectStreamer *MCOS,
// This emits an "absolute" address used in the start of a dwarf line number
// table. This will result in a relocatation entry for the address.
//
static inline void EmitDwarfSetAddress(MCObjectStreamer *MCOS,
MCSymbol *Symbol) {
static inline void EmitDwarfSetAddress(MCStreamer *MCOS,
MCSymbol *Symbol,
int PointerSize) {
MCOS->EmitIntValue(dwarf::DW_LNS_extended_op, 1);
int sizeof_address = MCOS->getAssembler().getBackend().getPointerSize();
MCOS->EmitULEB128IntValue(sizeof_address + 1);
MCOS->EmitULEB128IntValue(PointerSize + 1);
MCOS->EmitIntValue(dwarf::DW_LNE_set_address, 1);
MCOS->EmitSymbolValue(Symbol, sizeof_address);
MCOS->EmitSymbolValue(Symbol, PointerSize);
}
//
// This emits the Dwarf line table for the specified section from the entries
// in the LineSection.
//
static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
static inline void EmitDwarfLineTable(MCStreamer *MCOS,
const MCSection *Section,
MCLineSection *LineSection,
const MCSection *DwarfLineSection) {
const MCSection *DwarfLineSection,
MCSectionData *DLS,
int PointerSize) {
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Column = 0;
unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
unsigned Isa = 0;
MCSymbol *LastLabel = NULL;
MCSectionData &DLS =
MCOS->getAssembler().getOrCreateSectionData(*DwarfLineSection);
// Loop through each MCLineEntry and encode the dwarf line number table.
for (MCLineSection::iterator
@ -185,9 +185,9 @@ static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
// At this point we want to emit/create the sequence to encode the delta in
// line numbers and the increment of the address from the previous Label
// and the current Label.
if (LastLabel == NULL) {
if (LastLabel == NULL || DLS == NULL) {
// emit the sequence to set the address
EmitDwarfSetAddress(MCOS, Label);
EmitDwarfSetAddress(MCOS, Label, PointerSize);
// emit the sequence for the LineDelta (from 1) and a zero address delta.
MCDwarfLineAddr::Emit(MCOS, LineDelta, 0);
}
@ -196,7 +196,7 @@ static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
// this Label (plus 0).
const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, Label,0);
// Create a Dwarf Line fragment for the LineDelta and AddrDelta.
new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, &DLS);
new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, DLS);
}
LastLine = it->getLine();
@ -218,19 +218,29 @@ static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
// Switch back the the dwarf line section.
MCOS->SwitchSection(DwarfLineSection);
// Create an expression for the address delta from the LastLabel and this
// SectionEnd label.
const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, SectionEnd,
0);
// Create a Dwarf Line fragment for the LineDelta and AddrDelta.
new MCDwarfLineAddrFragment(INT64_MAX, *AddrDelta, &DLS);
if (DLS == NULL) {
// emit the sequence to set the address
EmitDwarfSetAddress(MCOS, SectionEnd, PointerSize);
// emit the sequence for the LineDelta (from 1) and a zero address delta.
MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
} else {
// Create an expression for the address delta from the LastLabel and this
// SectionEnd label.
const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, SectionEnd,
0);
// Create a Dwarf Line fragment for the LineDelta and AddrDelta.
new MCDwarfLineAddrFragment(INT64_MAX, *AddrDelta, DLS);
}
}
//
// This emits the Dwarf file and the line tables.
//
void MCDwarfFileTable::Emit(MCObjectStreamer *MCOS,
const MCSection *DwarfLineSection) {
void MCDwarfFileTable::Emit(MCStreamer *MCOS,
const MCSection *DwarfLineSection,
MCSectionData *DLS,
int PointerSize) {
// Switch to the section where the table will be emitted into.
MCOS->SwitchSection(DwarfLineSection);
@ -315,7 +325,8 @@ void MCDwarfFileTable::Emit(MCObjectStreamer *MCOS,
MCOS->getContext().getMCLineSections();
for (DenseMap<const MCSection *, MCLineSection *>::iterator it =
MCLineSections.begin(), ie = MCLineSections.end(); it != ie; ++it) {
EmitDwarfLineTable(MCOS, it->first, it->second, DwarfLineSection);
EmitDwarfLineTable(MCOS, it->first, it->second, DwarfLineSection, DLS,
PointerSize);
// Now delete the MCLineSections that were created in MCLineEntry::Make()
// and used to emit the line table.
@ -345,7 +356,7 @@ void MCDwarfLineAddr::Write(MCObjectWriter *OW, int64_t LineDelta,
}
/// Utility function to emit the encoding to a streamer.
void MCDwarfLineAddr::Emit(MCObjectStreamer *MCOS, int64_t LineDelta,
void MCDwarfLineAddr::Emit(MCStreamer *MCOS, int64_t LineDelta,
uint64_t AddrDelta) {
SmallString<256> Tmp;
raw_svector_ostream OS(Tmp);

5
lib/MC/MCELFStreamer.cpp
View File

@ -490,7 +490,10 @@ void MCELFStreamer::Finish() {
const MCSection *DwarfLineSection =
getContext().getELFSection(".debug_line", 0, 0,
SectionKind::getDataRelLocal());
MCDwarfFileTable::Emit(this, DwarfLineSection);
MCSectionData &DLS =
getAssembler().getOrCreateSectionData(*DwarfLineSection);
int PointerSize = getAssembler().getBackend().getPointerSize();
MCDwarfFileTable::Emit(this, DwarfLineSection, &DLS, PointerSize);
}
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),

5
lib/MC/MCMachOStreamer.cpp
View File

@ -414,7 +414,10 @@ void MCMachOStreamer::Finish() {
"__debug_line",
MCSectionMachO::S_ATTR_DEBUG,
0, SectionKind::getDataRelLocal());
MCDwarfFileTable::Emit(this, DwarfLineSection);
MCSectionData &DLS =
getAssembler().getOrCreateSectionData(*DwarfLineSection);
int PointerSize = getAssembler().getBackend().getPointerSize();
MCDwarfFileTable::Emit(this, DwarfLineSection, &DLS, PointerSize);
}
// We have to set the fragment atom associations so we can relax properly for

3
lib/Target/TargetMachine.cpp
View File

@ -219,7 +219,8 @@ FunctionSections("ffunction-sections",
TargetMachine::TargetMachine(const Target &T)
: TheTarget(T), AsmInfo(0),
MCRelaxAll(false) {
MCRelaxAll(false),
MCUseLoc(true) {
// Typically it will be subtargets that will adjust FloatABIType from Default
// to Soft or Hard.
if (UseSoftFloat)