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For Darwin, emit all the text section directives together before the dwarf

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section directives.  This causes the assembler to put the text sections at
the beginning of the object file, which helps work around a limitation of the
Darwin ARM relocations.  Radar 7255355.

llvm-svn: 83127
This commit is contained in:
Bob Wilson 2009-09-30 00:23:42 +00:00
parent 0136a7ebec
commit 48f9855607
1 changed files with 19 additions and 0 deletions
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19
lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
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@ -1046,6 +1046,25 @@ void ARMAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
bool ARMAsmPrinter::doInitialization(Module &M) {
if (Subtarget->isTargetDarwin()) {
Reloc::Model RelocM = TM.getRelocationModel();
if (RelocM == Reloc::PIC_ || RelocM == Reloc::DynamicNoPIC) {
// Declare all the text sections up front (before the DWARF sections
// emitted by AsmPrinter::doInitialization) so the assembler will keep
// them together at the beginning of the object file. This helps
// avoid out-of-range branches that are due a fundamental limitation of
// the way symbol offsets are encoded with the current Darwin ARM
// relocations.
O << "\t.section __TEXT,__text,regular\n"
<< "\t.section __TEXT,__textcoal_nt,coalesced\n"
<< "\t.section __TEXT,__const_coal,coalesced\n";
if (RelocM == Reloc::DynamicNoPIC)
O << "\t.section __TEXT,__symbol_stub4,symbol_stubs,none,12\n";
else
O << "\t.section __TEXT,__picsymbolstub4,symbol_stubs,none,16\n";
}
}
bool Result = AsmPrinter::doInitialization(M);
DW = getAnalysisIfAvailable<DwarfWriter>();