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Initial support for the cfi directives. This is just enough to get

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f:
        .cfi_startproc
        nop
        .cfi_endproc

assembled (on ELF).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121434 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2010-12-09 23:48:29 +00:00
parent 29012319cd
commit 1c952b9cc9
32 changed files with 550 additions and 176 deletions
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63
lib/MC/MCAsmStreamer.cpp
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@@ -24,6 +24,7 @@
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetAsmInfo.h"
using namespace llvm;
namespace {
@@ -37,32 +38,26 @@ 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;
unsigned UseLoc : 1;
bool needsSet(const MCExpr *Value);
public:
MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
bool isLittleEndian, bool isVerboseAsm,
const TargetLoweringObjectFile *tlof, int pointerSize,
bool isVerboseAsm,
bool useLoc,
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) {
IsVerboseAsm(isVerboseAsm),
ShowInst(showInst), UseLoc(useLoc) {
if (InstPrinter && IsVerboseAsm)
InstPrinter->setCommentStream(CommentStream);
}
~MCAsmStreamer() {}
bool isLittleEndian() const { return IsLittleEndian; }
inline void EmitEOL() {
// If we don't have any comments, just emit a \n.
if (!IsVerboseAsm) {
@@ -152,7 +147,8 @@ public:
virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
bool isPCRel, unsigned AddrSpace);
virtual void EmitIntValue(uint64_t Value, unsigned Size,
unsigned AddrSpace = 0);
@@ -307,7 +303,8 @@ void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label) {
EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
EmitDwarfSetLineAddr(LineDelta, Label,
getContext().getTargetAsmInfo().getPointerSize());
}
void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
@@ -512,9 +509,10 @@ void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
}
void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
bool isPCRel, unsigned AddrSpace) {
assert(CurSection && "Cannot emit contents before setting section!");
assert(!isPCRel && "Cannot emit pc relative relocations!");
const char *Directive = 0;
switch (Size) {
default: break;
@@ -528,7 +526,7 @@ void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
int64_t IntValue;
if (!Value->EvaluateAsAbsolute(IntValue))
report_fatal_error("Don't know how to emit this value.");
if (isLittleEndian()) {
if (getContext().getTargetAsmInfo().isLittleEndian()) {
EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
} else {
@@ -662,7 +660,7 @@ void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
}
bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
if (!TLOF) {
if (UseLoc) {
OS << "\t.file\t" << FileNo << ' ';
PrintQuotedString(Filename, OS);
EmitEOL();
@@ -676,7 +674,7 @@ void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Discriminator) {
this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
Isa, Discriminator);
if (TLOF)
if (!UseLoc)
return;
OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
@@ -829,7 +827,7 @@ void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
unsigned Bit = (Code[i] >> j) & 1;
unsigned FixupBit;
if (IsLittleEndian)
if (getContext().getTargetAsmInfo().isLittleEndian())
FixupBit = i * 8 + j;
else
FixupBit = i * 8 + (7-j);
@@ -855,7 +853,7 @@ void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
assert(CurSection && "Cannot emit contents before setting section!");
if (TLOF)
if (!UseLoc)
MCLineEntry::Make(this, getCurrentSection());
// Show the encoding in a comment if we have a code emitter.
@@ -888,28 +886,15 @@ 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());
if (getContext().hasDwarfFiles() && !UseLoc)
MCDwarfFileTable::Emit(this);
}
MCStreamer *llvm::createAsmStreamer(MCContext &Context,
formatted_raw_ostream &OS,
bool isLittleEndian,
bool isVerboseAsm, MCInstPrinter *IP,
bool isVerboseAsm, bool useLoc,
MCInstPrinter *IP,
MCCodeEmitter *CE, bool ShowInst) {
return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
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);
return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc,
IP, CE, ShowInst);
}