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llvm/lib/Target/PTX/PTXMCAsmStreamer.cpp
Benjamin Kramer 36a16015ac Don't drop alignment info on local common symbols. 
- On COFF the .lcomm directive has an alignment argument.
- On ELF we fall back to .local + .comm

Based on a patch by NAKAMURA Takumi.

Fixes PR9337, PR9483 and PR10128.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138976 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-01 23:04:27 +00:00

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//===- lib/Target/PTX/PTXMCAsmStreamer.cpp - PTX Text Assembly Output -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.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/MCInstPrinter.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class PTXMCAsmStreamer : public MCStreamer {
formatted_raw_ostream &OS;
const MCAsmInfo &MAI;
OwningPtr<MCInstPrinter> InstPrinter;
OwningPtr<MCCodeEmitter> Emitter;
SmallString<128> CommentToEmit;
raw_svector_ostream CommentStream;
unsigned IsVerboseAsm : 1;
unsigned ShowInst : 1;
public:
PTXMCAsmStreamer(MCContext &Context,
formatted_raw_ostream &os,
bool isVerboseAsm, bool useLoc,
MCInstPrinter *printer,
MCCodeEmitter *emitter,
bool showInst)
: MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
IsVerboseAsm(isVerboseAsm),
ShowInst(showInst) {
if (InstPrinter && IsVerboseAsm)
InstPrinter->setCommentStream(CommentStream);
}
~PTXMCAsmStreamer() {}
inline void EmitEOL() {
// If we don't have any comments, just emit a \n.
if (!IsVerboseAsm) {
OS << '\n';
return;
}
EmitCommentsAndEOL();
}
void EmitCommentsAndEOL();
/// isVerboseAsm - Return true if this streamer supports verbose assembly at
/// all.
virtual bool isVerboseAsm() const { return IsVerboseAsm; }
/// hasRawTextSupport - We support EmitRawText.
virtual bool hasRawTextSupport() const { return true; }
/// 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);
/// AddEncodingComment - Add a comment showing the encoding of an instruction.
virtual void AddEncodingComment(const MCInst &Inst);
/// GetCommentOS - Return a raw_ostream that comments can be written to.
/// Unlike AddComment, you are required to terminate comments with \n if you
/// use this method.
virtual raw_ostream &GetCommentOS() {
if (!IsVerboseAsm)
return nulls(); // Discard comments unless in verbose asm mode.
return CommentStream;
}
/// AddBlankLine - Emit a blank line to a .s file to pretty it up.
virtual void AddBlankLine() {
EmitEOL();
}
/// @name MCStreamer Interface
/// @{
virtual void ChangeSection(const MCSection *Section);
virtual void InitSections() {}
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitThumbFunc(MCSymbol *Func);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label,
unsigned PointerSize);
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
virtual void EmitCOFFSymbolStorageClass(int StorageClass);
virtual void EmitCOFFSymbolType(int Type);
virtual void EndCOFFSymbolDef();
virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment);
/// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
///
/// @param Symbol - The common symbol to emit.
/// @param Size - The size of the common symbol.
/// @param ByteAlignment - The alignment of the common symbol in bytes.
virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment);
virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
unsigned Size = 0, unsigned ByteAlignment = 0);
virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment = 0);
virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
unsigned AddrSpace);
virtual void EmitULEB128Value(const MCExpr *Value);
virtual void EmitSLEB128Value(const MCExpr *Value);
virtual void EmitGPRel32Value(const MCExpr *Value);
virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace);
virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
unsigned ValueSize = 1,
unsigned MaxBytesToEmit = 0);
virtual void EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit = 0);
virtual void EmitValueToOffset(const MCExpr *Offset,
unsigned char Value = 0);
virtual void EmitFileDirective(StringRef Filename);
virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
virtual void EmitInstruction(const MCInst &Inst);
/// EmitRawText - If this file is backed by an assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
virtual void EmitRawText(StringRef String);
virtual void Finish();
/// @}
}; // class PTXMCAsmStreamer
}
/// TODO: Add appropriate implementation of Emit*() methods when needed
void PTXMCAsmStreamer::AddComment(const Twine &T) {
if (!IsVerboseAsm) return;
// Make sure that CommentStream is flushed.
CommentStream.flush();
T.toVector(CommentToEmit);
// Each comment goes on its own line.
CommentToEmit.push_back('\n');
// Tell the comment stream that the vector changed underneath it.
CommentStream.resync();
}
void PTXMCAsmStreamer::EmitCommentsAndEOL() {
if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
OS << '\n';
return;
}
CommentStream.flush();
StringRef Comments = CommentToEmit.str();
assert(Comments.back() == '\n' &&
"Comment array not newline terminated");
do {
// Emit a line of comments.
OS.PadToColumn(MAI.getCommentColumn());
size_t Position = Comments.find('\n');
OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
Comments = Comments.substr(Position+1);
} while (!Comments.empty());
CommentToEmit.clear();
// Tell the comment stream that the vector changed underneath it.
CommentStream.resync();
}
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 PTXMCAsmStreamer::ChangeSection(const MCSection *Section) {
assert(Section && "Cannot switch to a null section!");
}
void PTXMCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
//assert(getCurrentSection() && "Cannot emit before setting section!");
OS << *Symbol << MAI.getLabelSuffix();
EmitEOL();
Symbol->setSection(*getCurrentSection());
}
void PTXMCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
void PTXMCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {}
void PTXMCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
OS << *Symbol << " = " << *Value;
EmitEOL();
// FIXME: Lift context changes into super class.
Symbol->setVariableValue(Value);
}
void PTXMCAsmStreamer::EmitWeakReference(MCSymbol *Alias,
const MCSymbol *Symbol) {
OS << ".weakref " << *Alias << ", " << *Symbol;
EmitEOL();
}
void PTXMCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label,
unsigned PointerSize) {
report_fatal_error("Unimplemented.");
}
void PTXMCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
MCSymbolAttr Attribute) {}
void PTXMCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
void PTXMCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
void PTXMCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {}
void PTXMCAsmStreamer::EmitCOFFSymbolType (int Type) {}
void PTXMCAsmStreamer::EndCOFFSymbolDef() {}
void PTXMCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
void PTXMCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {}
void PTXMCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {}
void PTXMCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
unsigned Size, unsigned ByteAlignment) {}
void PTXMCAsmStreamer::EmitTBSSSymbol(const MCSection *Section,
MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment) {}
static inline char toOctal(int X) { return (X&7)+'0'; }
static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
OS << '"';
for (unsigned i = 0, e = Data.size(); i != e; ++i) {
unsigned char C = Data[i];
if (C == '"' || C == '\\') {
OS << '\\' << (char)C;
continue;
}
if (isprint((unsigned char)C)) {
OS << (char)C;
continue;
}
switch (C) {
case '\b': OS << "\\b"; break;
case '\f': OS << "\\f"; break;
case '\n': OS << "\\n"; break;
case '\r': OS << "\\r"; break;
case '\t': OS << "\\t"; break;
default:
OS << '\\';
OS << toOctal(C >> 6);
OS << toOctal(C >> 3);
OS << toOctal(C >> 0);
break;
}
}
OS << '"';
}
void PTXMCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
assert(getCurrentSection() && "Cannot emit contents before setting section!");
if (Data.empty()) return;
if (Data.size() == 1) {
OS << MAI.getData8bitsDirective(AddrSpace);
OS << (unsigned)(unsigned char)Data[0];
EmitEOL();
return;
}
// If the data ends with 0 and the target supports .asciz, use it, otherwise
// use .ascii
if (MAI.getAscizDirective() && Data.back() == 0) {
OS << MAI.getAscizDirective();
Data = Data.substr(0, Data.size()-1);
} else {
OS << MAI.getAsciiDirective();
}
OS << ' ';
PrintQuotedString(Data, OS);
EmitEOL();
}
void PTXMCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
assert(getCurrentSection() && "Cannot emit contents before setting section!");
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;
int64_t IntValue;
if (!Value->EvaluateAsAbsolute(IntValue))
report_fatal_error("Don't know how to emit this value.");
if (getContext().getAsmInfo().isLittleEndian()) {
EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
} else {
EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
}
return;
}
assert(Directive && "Invalid size for machine code value!");
OS << Directive << *Value;
EmitEOL();
}
void PTXMCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
assert(MAI.hasLEB128() && "Cannot print a .uleb");
OS << ".uleb128 " << *Value;
EmitEOL();
}
void PTXMCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
assert(MAI.hasLEB128() && "Cannot print a .sleb");
OS << ".sleb128 " << *Value;
EmitEOL();
}
void PTXMCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
assert(MAI.getGPRel32Directive() != 0);
OS << MAI.getGPRel32Directive() << *Value;
EmitEOL();
}
/// EmitFill - Emit NumBytes bytes worth of the value specified by
/// FillValue. This implements directives such as '.space'.
void PTXMCAsmStreamer::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 PTXMCAsmStreamer::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;
}
EmitEOL();
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;
EmitEOL();
}
void PTXMCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {}
void PTXMCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {}
void PTXMCAsmStreamer::EmitFileDirective(StringRef Filename) {
assert(MAI.hasSingleParameterDotFile());
OS << "\t.file\t";
PrintQuotedString(Filename, OS);
EmitEOL();
}
// FIXME: should we inherit from MCAsmStreamer?
bool PTXMCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
StringRef Filename){
OS << "\t.file\t" << FileNo << ' ';
PrintQuotedString(Filename, OS);
EmitEOL();
return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
}
void PTXMCAsmStreamer::AddEncodingComment(const MCInst &Inst) {}
void PTXMCAsmStreamer::EmitInstruction(const MCInst &Inst) {
assert(getCurrentSection() && "Cannot emit contents before setting section!");
// Show the encoding in a comment if we have a code emitter.
if (Emitter)
AddEncodingComment(Inst);
// Show the MCInst if enabled.
if (ShowInst) {
Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
GetCommentOS() << "\n";
}
// If we have an AsmPrinter, use that to print, otherwise print the MCInst.
if (InstPrinter)
InstPrinter->printInst(&Inst, OS);
else
Inst.print(OS, &MAI);
EmitEOL();
}
/// EmitRawText - If this file is backed by an assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
void PTXMCAsmStreamer::EmitRawText(StringRef String) {
if (!String.empty() && String.back() == '\n')
String = String.substr(0, String.size()-1);
OS << String;
EmitEOL();
}
void PTXMCAsmStreamer::Finish() {}
namespace llvm {
MCStreamer *createPTXAsmStreamer(MCContext &Context,
formatted_raw_ostream &OS,
bool isVerboseAsm, bool useLoc, bool useCFI,
MCInstPrinter *IP,
MCCodeEmitter *CE, MCAsmBackend *MAB,
bool ShowInst) {
return new PTXMCAsmStreamer(Context, OS, isVerboseAsm, useLoc,
IP, CE, ShowInst);
}
}
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