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This patch adds a flag in MCAsmInfo that indicates whether dwarf register

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numbers should be printed instead of symbolic register names in
MCAsmStreamer::EmitRegisterName. This is necessary because some versions of
GNU assembler won't accept code in which symbolic register names are used in
cfi directives. There is no change in behavior unless the flag is explicitly
set to true by a backend.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134635 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-07-07 20:30:33 +00:00
parent 17a2f8e551
commit 3014b2f322
3 changed files with 9 additions and 1 deletions
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7
include/llvm/MC/MCAsmInfo.h
View File

@ -284,6 +284,10 @@ namespace llvm {
// use EmitLabelOffsetDifference.
bool DwarfUsesLabelOffsetForRanges;
/// DwarfRegNumForCFI - True if dwarf register numbers are printed
/// instead of symbolic register names in .cfi_* directives.
bool DwarfRegNumForCFI; // Defaults to false;
//===--- CBE Asm Translation Table -----------------------------------===//
const char *const *AsmTransCBE; // Defaults to empty
@ -475,6 +479,9 @@ namespace llvm {
bool doesDwarfUsesLabelOffsetForRanges() const {
return DwarfUsesLabelOffsetForRanges;
}
bool useDwarfRegNumForCFI() const {
return DwarfRegNumForCFI;
}
const char *const *getAsmCBE() const {
return AsmTransCBE;
}

1
lib/MC/MCAsmInfo.cpp
View File

@ -78,6 +78,7 @@ MCAsmInfo::MCAsmInfo() {
DwarfRequiresRelocationForSectionOffset = true;
DwarfSectionOffsetDirective = 0;
DwarfUsesLabelOffsetForRanges = true;
DwarfRegNumForCFI = false;
HasMicrosoftFastStdCallMangling = false;
AsmTransCBE = 0;

2
lib/MC/MCAsmStreamer.cpp
View File

@ -825,7 +825,7 @@ void MCAsmStreamer::EmitCFIEndProc() {
}
void MCAsmStreamer::EmitRegisterName(int64_t Register) {
if (InstPrinter) {
if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
const TargetAsmInfo &asmInfo = getContext().getTargetAsmInfo();
unsigned LLVMRegister = asmInfo.getLLVMRegNum(Register, true);
InstPrinter->printRegName(OS, LLVMRegister);