//===----------------------------------------------------------------------===//
//
// Emit general DWARF directives.
-//
+//
//===----------------------------------------------------------------------===//
#include "DwarfPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetFrameInfo.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/ADT/SmallString.h"
using namespace llvm;
-DwarfPrinter::DwarfPrinter(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T,
- const char *flavor)
-: O(OS), Asm(A), MAI(T), TD(Asm->TM.getTargetData()),
+DwarfPrinter::DwarfPrinter(AsmPrinter *A)
+: Asm(A), MAI(A->MAI), TD(Asm->TM.getTargetData()),
RI(Asm->TM.getRegisterInfo()), M(NULL), MF(NULL), MMI(NULL),
- SubprogramCount(0), Flavor(flavor), SetCounter(1) {}
+ SubprogramCount(0) {}
-void DwarfPrinter::PrintRelDirective(bool Force32Bit, bool isInSection) const {
- if (isInSection && MAI->getDwarfSectionOffsetDirective())
- O << MAI->getDwarfSectionOffsetDirective();
- else if (Force32Bit || TD->getPointerSize() == sizeof(int32_t))
- O << MAI->getData32bitsDirective();
- else
- O << MAI->getData64bitsDirective();
+
+/// getDWLabel - Return the MCSymbol corresponding to the assembler temporary
+/// label with the specified stem and unique ID.
+MCSymbol *DwarfPrinter::getDWLabel(const char *Name, unsigned ID) const {
+ // FIXME: REMOVE this. However, there is stuff in EH that passes counters in
+ // here that can be zero.
+
+ //assert(ID && "Should use getTempLabel if no ID");
+ if (ID == 0) return getTempLabel(Name);
+ return Asm->OutContext.GetOrCreateSymbol
+ (Twine(MAI->getPrivateGlobalPrefix()) + Twine(Name) + Twine(ID));
}
-/// EOL - Print a newline character to asm stream. If a comment is present
-/// then it will be printed first. Comments should not contain '\n'.
-void DwarfPrinter::EOL(const Twine &Comment) const {
- if (Asm->VerboseAsm && !Comment.isTriviallyEmpty()) {
- Asm->O.PadToColumn(MAI->getCommentColumn());
- Asm->O << Asm->MAI->getCommentString() << ' ' << Comment;
+/// getTempLabel - Return the MCSymbol corresponding to the assembler temporary
+/// label with the specified name.
+MCSymbol *DwarfPrinter::getTempLabel(const char *Name) const {
+ return Asm->OutContext.GetOrCreateSymbol
+ (Twine(MAI->getPrivateGlobalPrefix()) + Name);
+}
+
+
+/// SizeOfEncodedValue - Return the size of the encoding in bytes.
+unsigned DwarfPrinter::SizeOfEncodedValue(unsigned Encoding) const {
+ if (Encoding == dwarf::DW_EH_PE_omit)
+ return 0;
+
+ switch (Encoding & 0x07) {
+ case dwarf::DW_EH_PE_absptr:
+ return TD->getPointerSize();
+ case dwarf::DW_EH_PE_udata2:
+ return 2;
+ case dwarf::DW_EH_PE_udata4:
+ return 4;
+ case dwarf::DW_EH_PE_udata8:
+ return 8;
}
- Asm->O << '\n';
+
+ assert(0 && "Invalid encoded value.");
+ return 0;
}
static const char *DecodeDWARFEncoding(unsigned Encoding) {
Asm->OutStreamer.AddComment(Desc);
if (MAI->hasLEB128()) {
- O << "\t.sleb128\t" << Value;
- Asm->OutStreamer.AddBlankLine();
+ // FIXME: MCize.
+ Asm->OutStreamer.EmitRawText("\t.sleb128\t" + Twine(Value));
return;
}
Value >>= 7;
IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
if (IsMore) Byte |= 0x80;
-
Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
} while (IsMore);
}
/// EmitULEB128 - emit the specified signed leb128 value.
-void DwarfPrinter::EmitULEB128(unsigned Value, const char *Desc) const {
+void DwarfPrinter::EmitULEB128(unsigned Value, const char *Desc,
+ unsigned PadTo) const {
if (Asm->VerboseAsm && Desc)
Asm->OutStreamer.AddComment(Desc);
- if (MAI->hasLEB128()) {
- O << "\t.uleb128\t" << Value;
- Asm->OutStreamer.AddBlankLine();
+ if (MAI->hasLEB128() && PadTo == 0) {
+ // FIXME: MCize.
+ Asm->OutStreamer.EmitRawText("\t.uleb128\t" + Twine(Value));
return;
}
- // If we don't have .uleb128, emit as .bytes.
+ // If we don't have .uleb128 or we want to emit padding, emit as .bytes.
do {
unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
Value >>= 7;
- if (Value) Byte |= 0x80;
+ if (Value || PadTo != 0) Byte |= 0x80;
Asm->OutStreamer.EmitIntValue(Byte, 1, /*addrspace*/0);
} while (Value);
+
+ if (PadTo) {
+ if (PadTo > 1)
+ Asm->OutStreamer.EmitFill(PadTo - 1, 0x80/*fillval*/, 0/*addrspace*/);
+ Asm->OutStreamer.EmitFill(1, 0/*fillval*/, 0/*addrspace*/);
+ }
}
-/// PrintLabelName - Print label name in form used by Dwarf writer.
-///
-void DwarfPrinter::PrintLabelName(const char *Tag, unsigned Number) const {
- O << MAI->getPrivateGlobalPrefix() << Tag;
- if (Number) O << Number;
-}
-void DwarfPrinter::PrintLabelName(const char *Tag, unsigned Number,
- const char *Suffix) const {
- O << MAI->getPrivateGlobalPrefix() << Tag;
- if (Number) O << Number;
- O << Suffix;
-}
+void DwarfPrinter::EmitReference(const MCSymbol *Sym, unsigned Encoding) const {
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
-/// EmitLabel - Emit location label for internal use by Dwarf.
-///
-void DwarfPrinter::EmitLabel(const char *Tag, unsigned Number) const {
- PrintLabelName(Tag, Number);
- O << ":\n";
+ const MCExpr *Exp = TLOF.getExprForDwarfReference(Sym, Asm->Mang,
+ Asm->MMI, Encoding,
+ Asm->OutStreamer);
+ Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
}
-/// EmitReference - Emit a reference to a label.
-///
-void DwarfPrinter::EmitReference(const char *Tag, unsigned Number,
- bool IsPCRelative, bool Force32Bit) const {
- PrintRelDirective(Force32Bit);
- PrintLabelName(Tag, Number);
- if (IsPCRelative) O << "-" << MAI->getPCSymbol();
-}
-void DwarfPrinter::EmitReference(const std::string &Name, bool IsPCRelative,
- bool Force32Bit) const {
- PrintRelDirective(Force32Bit);
- O << Name;
- if (IsPCRelative) O << "-" << MAI->getPCSymbol();
-}
+void DwarfPrinter::EmitReference(const GlobalValue *GV, unsigned Encoding)const{
+ const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
-void DwarfPrinter::EmitReference(const MCSymbol *Sym, bool IsPCRelative,
- bool Force32Bit) const {
- PrintRelDirective(Force32Bit);
- O << *Sym;
- if (IsPCRelative) O << "-" << MAI->getPCSymbol();
+ const MCExpr *Exp =
+ TLOF.getExprForDwarfGlobalReference(GV, Asm->Mang, Asm->MMI, Encoding,
+ Asm->OutStreamer);
+ Asm->OutStreamer.EmitValue(Exp, SizeOfEncodedValue(Encoding), /*addrspace*/0);
}
/// EmitDifference - Emit the difference between two labels. If this assembler
/// supports .set, we emit a .set of a temporary and then use it in the .word.
-void DwarfPrinter::EmitDifference(const char *TagHi, unsigned NumberHi,
- const char *TagLo, unsigned NumberLo,
+void DwarfPrinter::EmitDifference(const MCSymbol *TagHi, const MCSymbol *TagLo,
bool IsSmall) {
- if (MAI->hasSetDirective()) {
- // FIXME: switch to OutStreamer.EmitAssignment.
- O << "\t.set\t";
- PrintLabelName("set", SetCounter, Flavor);
- O << ",";
- PrintLabelName(TagHi, NumberHi);
- O << "-";
- PrintLabelName(TagLo, NumberLo);
- O << "\n";
-
- PrintRelDirective(IsSmall);
- PrintLabelName("set", SetCounter, Flavor);
- ++SetCounter;
- } else {
- PrintRelDirective(IsSmall);
- PrintLabelName(TagHi, NumberHi);
- O << "-";
- PrintLabelName(TagLo, NumberLo);
- }
+ unsigned Size = IsSmall ? 4 : TD->getPointerSize();
+ Asm->EmitLabelDifference(TagHi, TagLo, Size);
}
-void DwarfPrinter::EmitSectionOffset(const char* Label, const char* Section,
- unsigned LabelNumber,
- unsigned SectionNumber,
- bool IsSmall, bool isEH,
- bool useSet) {
- bool printAbsolute = false;
+void DwarfPrinter::EmitSectionOffset(const MCSymbol *Label,
+ const MCSymbol *Section,
+ bool IsSmall, bool isEH) {
+ bool isAbsolute;
if (isEH)
- printAbsolute = MAI->isAbsoluteEHSectionOffsets();
+ isAbsolute = MAI->isAbsoluteEHSectionOffsets();
else
- printAbsolute = MAI->isAbsoluteDebugSectionOffsets();
-
- if (MAI->hasSetDirective() && useSet) {
- // FIXME: switch to OutStreamer.EmitAssignment.
- O << "\t.set\t";
- PrintLabelName("set", SetCounter, Flavor);
- O << ",";
- PrintLabelName(Label, LabelNumber);
+ isAbsolute = MAI->isAbsoluteDebugSectionOffsets();
- if (!printAbsolute) {
- O << "-";
- PrintLabelName(Section, SectionNumber);
- }
-
- O << "\n";
- PrintRelDirective(IsSmall);
- PrintLabelName("set", SetCounter, Flavor);
- ++SetCounter;
+ if (!isAbsolute)
+ return EmitDifference(Label, Section, IsSmall);
+
+ // On COFF targets, we have to emit the weird .secrel32 directive.
+ if (const char *SecOffDir = MAI->getDwarfSectionOffsetDirective()) {
+ // FIXME: MCize.
+ Asm->OutStreamer.EmitRawText(SecOffDir + Twine(Label->getName()));
} else {
- PrintRelDirective(IsSmall, true);
- PrintLabelName(Label, LabelNumber);
-
- if (!printAbsolute) {
- O << "-";
- PrintLabelName(Section, SectionNumber);
- }
+ unsigned Size = IsSmall ? 4 : TD->getPointerSize();
+ Asm->OutStreamer.EmitSymbolValue(Label, Size, 0/*AddrSpace*/);
}
}
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.
-void DwarfPrinter::EmitFrameMoves(const char *BaseLabel, unsigned BaseLabelID,
+void DwarfPrinter::EmitFrameMoves(MCSymbol *BaseLabel,
const std::vector<MachineMove> &Moves,
bool isEH) {
- int stackGrowth =
- Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
- TargetFrameInfo::StackGrowsUp ?
- TD->getPointerSize() : -TD->getPointerSize();
- bool IsLocal = BaseLabel && strcmp(BaseLabel, "label") == 0;
-
+ int stackGrowth = TD->getPointerSize();
+ if (Asm->TM.getFrameInfo()->getStackGrowthDirection() !=
+ TargetFrameInfo::StackGrowsUp)
+ stackGrowth *= -1;
+
for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
const MachineMove &Move = Moves[i];
- unsigned LabelID = Move.getLabelID();
-
- if (LabelID) {
- LabelID = MMI->MappedLabel(LabelID);
-
- // Throw out move if the label is invalid.
- if (!LabelID) continue;
- }
+ MCSymbol *Label = Move.getLabel();
+ // Throw out move if the label is invalid.
+ if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
const MachineLocation &Dst = Move.getDestination();
const MachineLocation &Src = Move.getSource();
// Advance row if new location.
- if (BaseLabel && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
- EmitCFAByte(dwarf::DW_CFA_advance_loc4);
- EmitDifference("label", LabelID, BaseLabel, BaseLabelID, true);
- Asm->O << '\n';
-
- BaseLabelID = LabelID;
- BaseLabel = "label";
- IsLocal = true;
+ if (BaseLabel && Label) {
+ MCSymbol *ThisSym = Label;
+ if (ThisSym != BaseLabel) {
+ EmitCFAByte(dwarf::DW_CFA_advance_loc4);
+ EmitDifference(ThisSym, BaseLabel, true);
+ BaseLabel = ThisSym;
+ }
}
// If advancing cfa.
projects / oota-llvm.git / blobdiff