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Fix a bug in Darwin EH: FDE->CIE pointer must

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be relocatable.  Describe why .set is needed better.

llvm-svn: 48848
This commit is contained in:
Dale Johannesen 2008-03-26 23:31:39 +00:00
parent ee0874a62e
commit 4524d3a1d1
2 changed files with 18 additions and 15 deletions
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11
include/llvm/Target/TargetAsmInfo.h
View File

@ -65,8 +65,15 @@ namespace llvm {
/// section on this target. Null if this target doesn't support zerofill.
const char *ZeroFillDirective; // Default is null.
/// NeedsSet - True if target asm can't compute addresses on data
/// directives.
/// NeedsSet - True if target asm treats expressions in data directives
/// as linktime-relocatable. For assembly-time computation, we need to
/// use a .set. Thus:
/// .set w, x-y
/// .long w
/// is computed at assembly time, while
/// .long x-y
/// is relocated if the relative locations of x and y change at linktime.
/// We want both these things in different places.
bool NeedsSet; // Defaults to false.
/// MaxInstLength - This is the maximum possible length of an instruction,

22
lib/CodeGen/DwarfWriter.cpp
View File

@ -925,19 +925,20 @@ public:
void EmitSectionOffset(const char* Label, const char* Section,
unsigned LabelNumber, unsigned SectionNumber,
bool IsSmall = false, bool isEH = false) {
bool IsSmall = false, bool isEH = false,
bool useSet = true) {
bool printAbsolute = false;
if (TAI->needsSet()) {
if (isEH)
printAbsolute = TAI->isAbsoluteEHSectionOffsets();
else
printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
if (TAI->needsSet() && useSet) {
O << "\t.set\t";
PrintLabelName("set", SetCounter, Flavor);
O << ",";
PrintLabelName(Label, LabelNumber);
if (isEH)
printAbsolute = TAI->isAbsoluteEHSectionOffsets();
else
printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
if (!printAbsolute) {
O << "-";
PrintLabelName(Section, SectionNumber);
@ -953,11 +954,6 @@ public:
PrintLabelName(Label, LabelNumber);
if (isEH)
printAbsolute = TAI->isAbsoluteEHSectionOffsets();
else
printAbsolute = TAI->isAbsoluteDebugSectionOffsets();
if (!printAbsolute) {
O << "-";
PrintLabelName(Section, SectionNumber);
@ -2919,7 +2915,7 @@ private:
EmitSectionOffset("eh_frame_begin", "eh_frame_common",
EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
true, true);
true, true, false);
Asm->EOL("FDE CIE offset");
EmitReference("eh_func_begin", EHFrameInfo.Number, true);