//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
-
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
-#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCValue.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/FormattedStream.h"
using namespace llvm;
namespace {
- class MCAsmStreamer : public MCStreamer {
- raw_ostream &OS;
+class MCAsmStreamer : public MCStreamer {
+ formatted_raw_ostream &OS;
+ const MCAsmInfo &MAI;
+ bool IsLittleEndian, IsVerboseAsm;
+ MCInstPrinter *InstPrinter;
+ MCCodeEmitter *Emitter;
+
+ SmallString<128> CommentToEmit;
+public:
+ MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
+ const MCAsmInfo &mai,
+ bool isLittleEndian, bool isVerboseAsm, MCInstPrinter *printer,
+ MCCodeEmitter *emitter)
+ : MCStreamer(Context), OS(os), MAI(mai), IsLittleEndian(isLittleEndian),
+ IsVerboseAsm(isVerboseAsm), InstPrinter(printer), Emitter(emitter) {}
+ ~MCAsmStreamer() {}
+
+ bool isLittleEndian() const { return IsLittleEndian; }
+
+
+ inline void EmitEOL() {
+ if (CommentToEmit.empty()) {
+ OS << '\n';
+ return;
+ }
+ EmitCommentsAndEOL();
+ }
+ void EmitCommentsAndEOL();
+
+ /// AddComment - Add a comment that can be emitted to the generated .s
+ /// file if applicable as a QoI issue to make the output of the compiler
+ /// more readable. This only affects the MCAsmStreamer, and only when
+ /// verbose assembly output is enabled.
+ virtual void AddComment(const Twine &T);
+
+ /// @name MCStreamer Interface
+ /// @{
- MCSection *CurSection;
+ virtual void SwitchSection(const MCSection *Section);
- public:
- MCAsmStreamer(MCContext &Context, raw_ostream &_OS)
- : MCStreamer(Context), OS(_OS), CurSection(0) {}
- ~MCAsmStreamer() {}
+ virtual void EmitLabel(MCSymbol *Symbol);
- /// @name MCStreamer Interface
- /// @{
+ virtual void EmitAssemblerFlag(AssemblerFlag Flag);
- virtual void SwitchSection(MCSection *Section);
+ virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
- virtual void EmitLabel(MCSymbol *Symbol);
+ virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
- virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
- bool MakeAbsolute = false);
+ virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
- virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
+ virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
+ unsigned ByteAlignment);
- virtual void EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
- unsigned Pow2Alignment, bool IsLocal);
+ virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
+ unsigned Size = 0, unsigned ByteAlignment = 0);
- virtual void EmitBytes(const char *Data, unsigned Length);
+ virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
- virtual void EmitValue(const MCValue &Value, unsigned Size);
+ virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
+ virtual void EmitIntValue(uint64_t Value, unsigned Size, unsigned AddrSpace);
- virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
- unsigned ValueSize = 1,
- unsigned MaxBytesToEmit = 0);
+ virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
+ unsigned AddrSpace);
- virtual void EmitValueToOffset(const MCValue &Offset,
- unsigned char Value = 0);
-
- virtual void EmitInstruction(const MCInst &Inst);
+ 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);
+
+ virtual void Finish();
+
+ /// @}
+};
- virtual void Finish();
+} // end anonymous namespace.
+
+/// AddComment - Add a comment that can be emitted to the generated .s
+/// file if applicable as a QoI issue to make the output of the compiler
+/// more readable. This only affects the MCAsmStreamer, and only when
+/// verbose assembly output is enabled.
+void MCAsmStreamer::AddComment(const Twine &T) {
+ if (!IsVerboseAsm) return;
+ // Each comment goes on its own line.
+ if (!CommentToEmit.empty())
+ CommentToEmit.push_back('\n');
+ T.toVector(CommentToEmit);
+}
+
+void MCAsmStreamer::EmitCommentsAndEOL() {
+ StringRef Comments = CommentToEmit.str();
+ while (!Comments.empty()) {
+ // Emit a line of comments.
+ OS.PadToColumn(MAI.getCommentColumn());
+ size_t Position = Comments.find('\n');
+ OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
- /// @}
- };
-
-}
-
-/// Allow printing values directly to a raw_ostream.
-static 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.getConstant())
- os << " + " << Value.getConstant();
- } else {
- assert(!Value.getSymB() && "Invalid machine code value!");
- os << Value.getConstant();
+ if (Position == StringRef::npos) break;
+ Comments = Comments.substr(Position+1);
}
-
- return os;
+
+ CommentToEmit.clear();
}
+
static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
assert(Bytes && "Invalid size!");
return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
}
-static inline MCValue truncateToSize(const MCValue &Value, unsigned Bytes) {
- return MCValue::get(Value.getSymA(), Value.getSymB(),
- truncateToSize(Value.getConstant(), Bytes));
+static inline const MCExpr *truncateToSize(const MCExpr *Value,
+ unsigned Bytes) {
+ // FIXME: Do we really need this routine?
+ return Value;
}
-void MCAsmStreamer::SwitchSection(MCSection *Section) {
+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) {
- assert(Symbol->getSection() == 0 && "Cannot emit a symbol twice!");
+ assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
assert(CurSection && "Cannot emit before setting section!");
- assert(!getContext().GetSymbolValue(Symbol) &&
- "Cannot emit symbol which was directly assigned to!");
- OS << Symbol->getName() << ":\n";
- Symbol->setSection(CurSection);
- Symbol->setExternal(false);
+ OS << *Symbol << ":";
+ EmitEOL();
+ Symbol->setSection(*CurSection);
}
-void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
- bool MakeAbsolute) {
- assert(!Symbol->getSection() && "Cannot assign to a label!");
-
- if (MakeAbsolute) {
- OS << ".set " << Symbol->getName() << ", " << Value << '\n';
- } else {
- OS << Symbol->getName() << " = " << Value << '\n';
+void MCAsmStreamer::EmitAssemblerFlag(AssemblerFlag Flag) {
+ switch (Flag) {
+ default: assert(0 && "Invalid flag!");
+ case SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
}
+ EmitEOL();
+}
+
+void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+ // Only absolute symbols can be redefined.
+ assert((Symbol->isUndefined() || Symbol->isAbsolute()) &&
+ "Cannot define a symbol twice!");
+
+ OS << *Symbol << " = " << *Value;
+ EmitEOL();
- getContext().SetSymbolValue(Symbol, Value);
+ // FIXME: Lift context changes into super class.
+ // FIXME: Set associated section.
+ Symbol->setValue(Value);
}
-void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
SymbolAttr Attribute) {
switch (Attribute) {
- 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;
+ case Global: OS << MAI.getGlobalDirective(); break; // .globl
+ 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;
+ EmitEOL();
+}
+
+void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+ OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
+ EmitEOL();
}
void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, unsigned Size,
- unsigned Pow2Alignment, bool IsLocal) {
- if (IsLocal)
- OS << ".lcomm";
- else
- OS << ".comm";
- OS << ' ' << Symbol->getName() << ',' << Size;
- if (Pow2Alignment != 0)
- OS << ',' << Pow2Alignment;
- OS << '\n';
-}
-
-void MCAsmStreamer::EmitBytes(const char *Data, unsigned Length) {
+ unsigned ByteAlignment) {
+ OS << MAI.getCOMMDirective() << *Symbol << ',' << Size;
+ if (ByteAlignment != 0 && MAI.getCOMMDirectiveTakesAlignment()) {
+ if (MAI.getAlignmentIsInBytes())
+ OS << ',' << ByteAlignment;
+ else
+ OS << ',' << Log2_32(ByteAlignment);
+ }
+ EmitEOL();
+}
+
+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 << ',' << Size;
+ if (ByteAlignment != 0)
+ OS << ',' << Log2_32(ByteAlignment);
+ }
+ EmitEOL();
+}
+
+void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
+ assert(CurSection && "Cannot emit contents before setting section!");
+ const char *Directive = MAI.getData8bitsDirective(AddrSpace);
+ for (unsigned i = 0, e = Data.size(); i != e; ++i) {
+ OS << Directive << (unsigned)(unsigned char)Data[i];
+ EmitEOL();
+ }
+}
+
+/// EmitIntValue - Special case of EmitValue that avoids the client having
+/// to pass in a MCExpr for constant integers.
+void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
+ unsigned AddrSpace) {
assert(CurSection && "Cannot emit contents before setting section!");
- for (unsigned i = 0; i != Length; ++i)
- OS << ".byte " << (unsigned) Data[i] << '\n';
+ const char *Directive = 0;
+ switch (Size) {
+ default: break;
+ case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
+ case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
+ case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
+ case 8:
+ Directive = MAI.getData64bitsDirective(AddrSpace);
+ // If the target doesn't support 64-bit data, emit as two 32-bit halves.
+ if (Directive) break;
+ if (isLittleEndian()) {
+ EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
+ EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
+ } else {
+ EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
+ EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
+ }
+ return;
+ }
+
+ assert(Directive && "Invalid size for machine code value!");
+ OS << Directive << truncateToSize(Value, Size);
+ EmitEOL();
}
-void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
+void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
+ unsigned AddrSpace) {
assert(CurSection && "Cannot emit contents before setting section!");
- // Need target hooks to know how to print this.
+ const char *Directive = 0;
switch (Size) {
- default:
- assert(0 && "Invalid size for machine code value!");
- case 1: OS << ".byte"; break;
- case 2: OS << ".short"; break;
- case 4: OS << ".long"; break;
- case 8: OS << ".quad"; break;
+ default: break;
+ case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
+ case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
+ case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
+ case 8: Directive = MAI.getData64bitsDirective(AddrSpace); break;
}
+
+ assert(Directive && "Invalid size for machine code value!");
+ OS << Directive << *truncateToSize(Value, Size);
+ EmitEOL();
+}
- OS << ' ' << truncateToSize(Value, Size) << '\n';
+/// EmitFill - Emit NumBytes bytes worth of the value specified by
+/// FillValue. This implements directives such as '.space'.
+void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
+ unsigned AddrSpace) {
+ if (NumBytes == 0) return;
+
+ if (AddrSpace == 0)
+ if (const char *ZeroDirective = MAI.getZeroDirective()) {
+ OS << ZeroDirective << NumBytes;
+ if (FillValue != 0)
+ OS << ',' << (int)FillValue;
+ EmitEOL();
+ return;
+ }
+
+ // Emit a byte at a time.
+ MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
}
void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) {
- // Some assemblers don't support .balign, so we always emit as .p2align if
- // this is a power of two. Otherwise we assume the client knows the target
- // supports .balign and use that.
- unsigned Pow2 = Log2_32(ByteAlignment);
- bool IsPow2 = (1U << Pow2) == ByteAlignment;
-
+ // 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;
+ }
+ EmitEOL();
+ return;
+ }
+
+ // Non-power of two alignment. This is not widely supported by assemblers.
+ // FIXME: Parameterize this based on MAI.
switch (ValueSize) {
- default:
- assert(0 && "Invalid size for machine code value!");
- case 8:
- assert(0 && "Unsupported alignment size!");
- case 1: OS << (IsPow2 ? ".p2align" : ".balign"); break;
- case 2: OS << (IsPow2 ? ".p2alignw" : ".balignw"); break;
- case 4: OS << (IsPow2 ? ".p2alignl" : ".balignl"); break;
+ 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 << ' ' << (IsPow2 ? Pow2 : ByteAlignment);
-
+ OS << ' ' << ByteAlignment;
OS << ", " << truncateToSize(Value, ValueSize);
if (MaxBytesToEmit)
OS << ", " << MaxBytesToEmit;
- OS << '\n';
+ EmitEOL();
}
-void MCAsmStreamer::EmitValueToOffset(const MCValue &Offset,
+void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
// FIXME: Verify that Offset is associated with the current section.
- OS << ".org " << Offset << ", " << (unsigned) Value << '\n';
-}
-
-static raw_ostream &operator<<(raw_ostream &OS, const MCOperand &Op) {
- if (Op.isReg())
- return OS << "reg:" << Op.getReg();
- if (Op.isImm())
- return OS << "imm:" << Op.getImm();
- if (Op.isMBBLabel())
- return OS << "mbblabel:("
- << Op.getMBBLabelFunction() << ", " << Op.getMBBLabelBlock();
- assert(Op.isMCValue() && "Invalid operand!");
- return OS << "val:" << Op.getMCValue();
+ OS << ".org " << *Offset << ", " << (unsigned) Value;
+ EmitEOL();
}
void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
assert(CurSection && "Cannot emit contents before setting section!");
- // FIXME: Implement proper printing.
- OS << "MCInst("
- << "opcode=" << Inst.getOpcode() << ", "
- << "operands=[";
- for (unsigned i = 0, e = Inst.getNumOperands(); i != e; ++i) {
- if (i)
- OS << ", ";
- OS << Inst.getOperand(i);
+
+ // If we have an AsmPrinter, use that to print.
+ if (InstPrinter) {
+ InstPrinter->printInst(&Inst);
+ EmitEOL();
+
+ // 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;
}
- OS << "])\n";
+
+ // Otherwise fall back to a structural printing for now. Eventually we should
+ // always have access to the target specific printer.
+ Inst.print(OS, &MAI);
+ EmitEOL();
}
void MCAsmStreamer::Finish() {
OS.flush();
}
-MCStreamer *llvm::createAsmStreamer(MCContext &Context, raw_ostream &OS) {
- return new MCAsmStreamer(Context, OS);
+MCStreamer *llvm::createAsmStreamer(MCContext &Context,
+ formatted_raw_ostream &OS,
+ const MCAsmInfo &MAI, bool isLittleEndian,
+ bool isVerboseAsm, MCInstPrinter *IP,
+ MCCodeEmitter *CE) {
+ return new MCAsmStreamer(Context, OS, MAI, isLittleEndian, isVerboseAsm,
+ IP, CE);
}
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