//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
-
-#include "llvm/MC/MCAtom.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCValue.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
- class MCAsmStreamer : public MCStreamer {
- raw_ostream &OS;
+class MCAsmStreamer : public MCStreamer {
+ raw_ostream &OS;
+ const MCAsmInfo &MAI;
+ MCInstPrinter *InstPrinter;
+ MCCodeEmitter *Emitter;
+public:
+ MCAsmStreamer(MCContext &Context, raw_ostream &_OS, const MCAsmInfo &tai,
+ MCInstPrinter *_Printer, MCCodeEmitter *_Emitter)
+ : MCStreamer(Context), OS(_OS), MAI(tai), InstPrinter(_Printer),
+ Emitter(_Emitter) {}
+ ~MCAsmStreamer() {}
- MCSection *CurSection;
+ /// @name MCStreamer Interface
+ /// @{
- public:
- MCAsmStreamer(MCContext &Context, raw_ostream &_OS)
- : MCStreamer(Context), OS(_OS) {}
- ~MCAsmStreamer() {}
+ virtual void SwitchSection(const MCSection *Section);
- /// @name MCStreamer Interface
- /// @{
+ virtual void EmitLabel(MCSymbol *Symbol);
- virtual void SwitchSection(MCSection *Section);
+ virtual void EmitAssemblerFlag(AssemblerFlag Flag);
- virtual void EmitLabel(MCSymbol *Symbol);
+ virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
- virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
- bool MakeAbsolute = false);
+ virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
- virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
+ virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
- virtual void EmitBytes(const char *Data, unsigned Length);
+ virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
+ unsigned ByteAlignment);
- virtual void EmitValue(const MCValue &Value, unsigned Size);
+ virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
+ unsigned Size = 0, unsigned ByteAlignment = 0);
- virtual void EmitInstruction(const MCInst &Inst);
+ virtual void EmitBytes(StringRef Data);
- virtual void Finish();
-
- /// @}
- };
-
-}
-
-/// Allow printing values directly to a raw_ostream.
-inline raw_ostream &operator<<(raw_ostream &os, const MCValue &Value) {
- if (Value.getSymA()) {
- os << Value.getSymA()->getName();
- if (Value.getSymB())
- os << " - " << Value.getSymB()->getName();
- if (Value.getCst())
- os << " + " << Value.getCst();
- } else {
- assert(!Value.getSymB() && "Invalid machine code value!");
- os << Value.getCst();
- }
+ virtual void EmitValue(const MCExpr *Value, unsigned Size);
+
+ virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
+ unsigned ValueSize = 1,
+ unsigned MaxBytesToEmit = 0);
+
+ virtual void EmitValueToOffset(const MCExpr *Offset,
+ unsigned char Value = 0);
+
+ virtual void EmitInstruction(const MCInst &Inst);
- return os;
+ virtual void Finish();
+
+ /// @}
+};
+
+} // end anonymous namespace.
+
+static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
+ assert(Bytes && "Invalid size!");
+ return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
}
-void MCAsmStreamer::SwitchSection(MCSection *Section) {
+static inline const MCExpr *truncateToSize(const MCExpr *Value,
+ unsigned Bytes) {
+ // FIXME: Do we really need this routine?
+ return Value;
+}
+
+void MCAsmStreamer::SwitchSection(const MCSection *Section) {
+ assert(Section && "Cannot switch to a null section!");
if (Section != CurSection) {
CurSection = Section;
-
- // FIXME: Really we would like the segment, flags, etc. to be separate
- // values instead of embedded in the name. Not all assemblers understand all
- // this stuff though.
- OS << ".section " << Section->getName() << "\n";
+ Section->PrintSwitchToSection(MAI, OS);
}
}
void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
- // FIXME: We need to enforce that we aren't printing atoms which are more
- // complicated than the assembler understands.
- //assert(Symbol->getAtom()->getSection() == CurSection &&
- // "The label for a symbol must match its section!");
- OS << Symbol->getName() << ":\n";
-}
-
-void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
- bool MakeAbsolute) {
- if (MakeAbsolute) {
- OS << ".set " << Symbol->getName() << ", " << Value << '\n';
- } else {
- OS << Symbol->getName() << " = " << Value << '\n';
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+ assert(CurSection && "Cannot emit before setting section!");
+
+ Symbol->print(OS, &MAI);
+ OS << ":\n";
+ Symbol->setSection(*CurSection);
+}
+
+void MCAsmStreamer::EmitAssemblerFlag(AssemblerFlag Flag) {
+ switch (Flag) {
+ default: assert(0 && "Invalid flag!");
+ case SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
}
+ OS << '\n';
}
-void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+ // Only absolute symbols can be redefined.
+ assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
+ "Cannot define a symbol twice!");
+
+ Symbol->print(OS, &MAI);
+ OS << " = ";
+ Value->print(OS, &MAI);
+ OS << '\n';
+
+ // FIXME: Lift context changes into super class.
+ // FIXME: Set associated section.
+ Symbol->setValue(Value);
+}
+
+void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
SymbolAttr Attribute) {
switch (Attribute) {
- case Global: OS << ".globl"; break;
- case Weak: OS << ".weak"; break;
- case PrivateExtern: OS << ".private_extern"; break;
+ case Global: OS << ".globl"; break;
+ case Hidden: OS << ".hidden"; break;
+ case IndirectSymbol: OS << ".indirect_symbol"; break;
+ case Internal: OS << ".internal"; break;
+ case LazyReference: OS << ".lazy_reference"; break;
+ case NoDeadStrip: OS << ".no_dead_strip"; break;
+ case PrivateExtern: OS << ".private_extern"; break;
+ case Protected: OS << ".protected"; break;
+ case Reference: OS << ".reference"; break;
+ case Weak: OS << ".weak"; break;
+ case WeakDefinition: OS << ".weak_definition"; break;
+ case WeakReference: OS << ".weak_reference"; break;
}
- OS << ' ' << Symbol->getName() << '\n';
+ OS << ' ';
+ Symbol->print(OS, &MAI);
+ OS << '\n';
+}
+
+void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+ OS << ".desc" << ' ';
+ Symbol->print(OS, &MAI);
+ OS << ',' << DescValue << '\n';
}
-void MCAsmStreamer::EmitBytes(const char *Data, unsigned Length) {
- for (unsigned i = 0; i != Length; ++i) {
- OS << ".byte " << (unsigned) Data[i] << '\n';
+void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
+ unsigned ByteAlignment) {
+ OS << ".comm ";
+ Symbol->print(OS, &MAI);
+ OS << ',' << Size;
+ if (ByteAlignment != 0)
+ OS << ',' << Log2_32(ByteAlignment);
+ OS << '\n';
+}
+
+void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+ unsigned Size, unsigned ByteAlignment) {
+ // Note: a .zerofill directive does not switch sections.
+ OS << ".zerofill ";
+
+ // This is a mach-o specific directive.
+ const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
+ OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
+
+ if (Symbol != NULL) {
+ OS << ',';
+ Symbol->print(OS, &MAI);
+ OS << ',' << Size;
+ if (ByteAlignment != 0)
+ OS << ',' << Log2_32(ByteAlignment);
}
+ OS << '\n';
}
-void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
+void MCAsmStreamer::EmitBytes(StringRef Data) {
+ assert(CurSection && "Cannot emit contents before setting section!");
+ for (unsigned i = 0, e = Data.size(); i != e; ++i)
+ OS << ".byte " << (unsigned) (unsigned char) Data[i] << '\n';
+}
+
+void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
+ assert(CurSection && "Cannot emit contents before setting section!");
// Need target hooks to know how to print this.
switch (Size) {
default:
- assert(0 && "Invalid size for machine code value!");
+ llvm_unreachable("Invalid size for machine code value!");
case 1: OS << ".byte"; break;
- case 2: OS << ".hword"; break;
+ case 2: OS << ".short"; break;
case 4: OS << ".long"; break;
case 8: OS << ".quad"; break;
}
- OS << ' ' << Value << '\n';
+ OS << ' ';
+ truncateToSize(Value, Size)->print(OS, &MAI);
+ OS << '\n';
+}
+
+void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
+ unsigned ValueSize,
+ unsigned MaxBytesToEmit) {
+ // Some assemblers don't support non-power of two alignments, so we always
+ // emit alignments as a power of two if possible.
+ if (isPowerOf2_32(ByteAlignment)) {
+ switch (ValueSize) {
+ default: llvm_unreachable("Invalid size for machine code value!");
+ case 1: OS << MAI.getAlignDirective(); break;
+ // FIXME: use MAI for this!
+ case 2: OS << ".p2alignw "; break;
+ case 4: OS << ".p2alignl "; break;
+ case 8: llvm_unreachable("Unsupported alignment size!");
+ }
+
+ if (MAI.getAlignmentIsInBytes())
+ OS << ByteAlignment;
+ else
+ OS << Log2_32(ByteAlignment);
+
+ if (Value || MaxBytesToEmit) {
+ OS << ", 0x";
+ OS.write_hex(truncateToSize(Value, ValueSize));
+
+ if (MaxBytesToEmit)
+ OS << ", " << MaxBytesToEmit;
+ }
+ OS << '\n';
+ return;
+ }
+
+ // Non-power of two alignment. This is not widely supported by assemblers.
+ // FIXME: Parameterize this based on MAI.
+ switch (ValueSize) {
+ default: llvm_unreachable("Invalid size for machine code value!");
+ case 1: OS << ".balign"; break;
+ case 2: OS << ".balignw"; break;
+ case 4: OS << ".balignl"; break;
+ case 8: llvm_unreachable("Unsupported alignment size!");
+ }
+
+ OS << ' ' << ByteAlignment;
+ OS << ", " << truncateToSize(Value, ValueSize);
+ if (MaxBytesToEmit)
+ OS << ", " << MaxBytesToEmit;
+ OS << '\n';
+}
+
+void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
+ unsigned char Value) {
+ // FIXME: Verify that Offset is associated with the current section.
+ OS << ".org ";
+ Offset->print(OS, &MAI);
+ OS << ", " << (unsigned) Value << '\n';
}
void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
- // FIXME: Implement.
- OS << "# FIXME: Implement instruction printing!\n";
+ assert(CurSection && "Cannot emit contents before setting section!");
+
+ // If we have an AsmPrinter, use that to print.
+ if (InstPrinter) {
+ InstPrinter->printInst(&Inst);
+ OS << '\n';
+
+ // Show the encoding if we have a code emitter.
+ if (Emitter) {
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ Emitter->EncodeInstruction(Inst, VecOS);
+ VecOS.flush();
+
+ OS.indent(20);
+ OS << " # encoding: [";
+ for (unsigned i = 0, e = Code.size(); i != e; ++i) {
+ if (i)
+ OS << ',';
+ OS << format("%#04x", uint8_t(Code[i]));
+ }
+ OS << "]\n";
+ }
+
+ return;
+ }
+
+ // Otherwise fall back to a structural printing for now. Eventually we should
+ // always have access to the target specific printer.
+ Inst.print(OS, &MAI);
+ OS << '\n';
}
void MCAsmStreamer::Finish() {
OS.flush();
}
-MCStreamer *llvm::createAsmStreamer(MCContext &Context, raw_ostream &OS) {
- return new MCAsmStreamer(Context, OS);
+MCStreamer *llvm::createAsmStreamer(MCContext &Context, raw_ostream &OS,
+ const MCAsmInfo &MAI, MCInstPrinter *IP,
+ MCCodeEmitter *CE) {
+ return new MCAsmStreamer(Context, OS, MAI, IP, CE);
}
projects / oota-llvm.git / blobdiff