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on darwin empty functions need to codegen into something of non-zero length,

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otherwise labels get incorrectly merged.  We handled this by emitting a 
".byte 0", but this isn't correct on thumb/arm targets where the text segment
needs to be a multiple of 2/4 bytes.  Handle this by emitting a noop.  This
is more gross than it should be because arm/ppc are not fully mc'ized yet.

This fixes rdar://7908505



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102400 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-26 23:37:21 +00:00
parent ae11c3f83e
commit ee9eb411ff
6 changed files with 28 additions and 5 deletions
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12
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@@ -585,9 +585,15 @@ void AsmPrinter::EmitFunctionBody() {
// If the function is empty and the object file uses .subsections_via_symbols,
// then we need to emit *something* to the function body to prevent the
// labels from collapsing together. Just emit a 0 byte.
if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
// labels from collapsing together. Just emit a noop.
if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) {
MCInst Noop;
TM.getInstrInfo()->getNoopForMachoTarget(Noop);
if (Noop.getOpcode())
OutStreamer.EmitInstruction(Noop);
else // Target not mc-ized yet.
OutStreamer.EmitRawText(StringRef("\tnop\n"));
}
// Emit target-specific gunk after the function body.
EmitFunctionBodyEnd();