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switch asmprinter to emit alignments through OutStreamer.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79406 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-08-19 06:12:02 +00:00
parent 6c2f9e14fd
commit 663c2d2580
2 changed files with 34 additions and 22 deletions
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13
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -753,15 +753,12 @@ void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
NumBits = std::max(NumBits, ForcedAlignBits);
if (NumBits == 0) return; // No need to emit alignment.
if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
O << TAI->getAlignDirective() << NumBits;
unsigned FillValue = 0;
if (getCurrentSection()->getKind().isText())
if (unsigned FillValue = TAI->getTextAlignFillValue()) {
O << ',';
PrintHex(FillValue);
}
O << '\n';
FillValue = TAI->getTextAlignFillValue();
OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
}
/// EmitZeros - Emit a block of zeros.

43
lib/MC/MCAsmStreamer.cpp
View File

@ -14,7 +14,9 @@
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
@ -224,24 +226,37 @@ void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
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)) {
OS << TAI.getAlignDirective();
if (TAI.getAlignmentIsInBytes())
OS << ByteAlignment;
else
OS << Log2_32(ByteAlignment);
if (Value || MaxBytesToEmit) {
OS << ", " << 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 TAI.
switch (ValueSize) {
default:
llvm_unreachable("Invalid size for machine code value!");
case 8:
llvm_unreachable("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;