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DebugInfo: Emit DW_TAG_subprogram's DW_AT_high_pc as an offset from the low_pc 

This removes a relocation from each subprogram, reducing link times,
etc.

llvm-svn: 203187
This commit is contained in:
David Blaikie 2014-03-07 01:30:55 +00:00
parent f5040a64bb
commit 48b1bdcf28
5 changed files with 14 additions and 3 deletions
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3
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -413,7 +413,8 @@ DIE *DwarfDebug::updateSubprogramScopeDIE(DwarfCompileUnit *SPCU,
}
SPCU->addLabelAddress(SPDie, dwarf::DW_AT_low_pc, FunctionBeginSym);
SPCU->addLabelAddress(SPDie, dwarf::DW_AT_high_pc, FunctionEndSym);
SPCU->addLabelDelta(SPDie, dwarf::DW_AT_high_pc, FunctionEndSym,
FunctionBeginSym);
const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
MachineLocation Location(RI->getFrameRegister(*Asm->MF));

6
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -320,6 +320,12 @@ void DwarfUnit::addSectionDelta(DIE *Die, dwarf::Attribute Attribute,
Die->addValue(Attribute, dwarf::DW_FORM_data4, Value);
}
void DwarfUnit::addLabelDelta(DIE *Die, dwarf::Attribute Attribute,
const MCSymbol *Hi, const MCSymbol *Lo) {
DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
Die->addValue(Attribute, dwarf::DW_FORM_data4, Value);
}
/// addDIEEntry - Add a DIE attribute data and value.
///
void DwarfUnit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute, DIE *Entry) {

4
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
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@ -359,6 +359,10 @@ public:
void addSectionDelta(DIE *Die, dwarf::Attribute Attribute, const MCSymbol *Hi,
const MCSymbol *Lo);
/// addLabelDelta - Add a label delta attribute data and value.
void addLabelDelta(DIE *Die, dwarf::Attribute Attribute, const MCSymbol *Hi,
const MCSymbol *Lo);
/// addDIEEntry - Add a DIE attribute data and value.
void addDIEEntry(DIE *Die, dwarf::Attribute Attribute, DIE *Entry);

2
llvm/test/DebugInfo/AArch64/dwarfdump.ll
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@ -12,7 +12,7 @@
; A couple of ABS64s similarly:
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: DW_AT_high_pc [DW_FORM_addr] (0x0000000000000008)
; CHECK: DW_AT_high_pc [DW_FORM_data4] (0x00000008)
define i32 @main() nounwind {
ret i32 0, !dbg !8

2
llvm/test/DebugInfo/X86/dbg-value-location.ll
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@ -4,7 +4,7 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
target triple = "x86_64-apple-darwin10.0.0"
;Radar 8950491
;CHECK: .long Lset5
;CHECK: .long Lset6
;CHECK-NEXT: ## DW_AT_decl_file
;CHECK-NEXT: ## DW_AT_decl_line
;CHECK-NEXT: ## DW_AT_type