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Add support to emit dwarf ranges.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101575 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2010-04-16 23:33:45 +00:00
parent cf7fbd41be
commit f2548caaa8
5 changed files with 65 additions and 5 deletions
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30
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@ -1094,6 +1094,36 @@ void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
}
/// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
/// where the size in bytes of the directive is specified by Size and Hi/Lo
/// specify the labels. This implicitly uses .set if it is available.
void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
const MCSymbol *Lo, unsigned Size)
const {
// Emit Hi+Offset - Lo
// Get the Hi+Offset expression.
const MCExpr *Plus =
MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
MCConstantExpr::Create(Offset, OutContext),
OutContext);
// Get the Hi+Offset-Lo expression.
const MCExpr *Diff =
MCBinaryExpr::CreateSub(Plus,
MCSymbolRefExpr::Create(Lo, OutContext),
OutContext);
if (!MAI->hasSetDirective())
OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/);
else {
// Otherwise, emit with .set (aka assignment).
MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
OutStreamer.EmitAssignment(SetLabel, Diff);
OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
}
}
//===----------------------------------------------------------------------===//