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Emit relocations from .debug_aranges to .debug_info for asm files

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2012-11-14 09:55:38 +00:00
parent 1e65676a12
commit 15ab115df5
2 changed files with 61 additions and 11 deletions
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28
lib/MC/MCDwarf.cpp
View File

@ -484,7 +484,8 @@ static void EmitGenDwarfAbbrev(MCStreamer *MCOS) {
// .debug_aranges section. Which contains a header and a table of pairs of
// PointerSize'ed values for the address and size of section(s) with line table
// entries (just the default .text in our case) and a terminating pair of zeros.
static void EmitGenDwarfAranges(MCStreamer *MCOS) {
static void EmitGenDwarfAranges(MCStreamer *MCOS,
const MCSymbol *InfoSectionSymbol) {
MCContext &context = MCOS->getContext();
// Create a symbol at the end of the section that we are creating the dwarf
@ -523,8 +524,11 @@ static void EmitGenDwarfAranges(MCStreamer *MCOS) {
// The 2 byte version, which is 2.
MCOS->EmitIntValue(2, 2);
// The 4 byte offset to the compile unit in the .debug_info from the start
// of the .debug_info, it is at the start of that section so this is zero.
MCOS->EmitIntValue(0, 4);
// of the .debug_info.
if (InfoSectionSymbol)
MCOS->EmitSymbolValue(InfoSectionSymbol, 4);
else
MCOS->EmitIntValue(0, 4);
// The 1 byte size of an address.
MCOS->EmitIntValue(AddrSize, 1);
// The 1 byte size of a segment descriptor, we use a value of zero.
@ -705,15 +709,21 @@ void MCGenDwarfInfo::Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol) {
// Create the dwarf sections in this order (.debug_line already created).
MCContext &context = MCOS->getContext();
const MCAsmInfo &AsmInfo = context.getAsmInfo();
bool CreateDwarfSectionSymbols =
AsmInfo.doesDwarfUseRelocationsAcrossSections();
if (!CreateDwarfSectionSymbols)
LineSectionSymbol = NULL;
MCSymbol *AbbrevSectionSymbol = NULL;
MCSymbol *InfoSectionSymbol = NULL;
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfInfoSection());
if (CreateDwarfSectionSymbols) {
InfoSectionSymbol = context.CreateTempSymbol();
MCOS->EmitLabel(InfoSectionSymbol);
}
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfAbbrevSection());
MCSymbol *AbbrevSectionSymbol;
if (AsmInfo.doesDwarfUseRelocationsAcrossSections()) {
if (CreateDwarfSectionSymbols) {
AbbrevSectionSymbol = context.CreateTempSymbol();
MCOS->EmitLabel(AbbrevSectionSymbol);
} else {
AbbrevSectionSymbol = NULL;
LineSectionSymbol = NULL;
}
MCOS->SwitchSection(context.getObjectFileInfo()->getDwarfARangesSection());
@ -722,7 +732,7 @@ void MCGenDwarfInfo::Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol) {
return;
// Output the data for .debug_aranges section.
EmitGenDwarfAranges(MCOS);
EmitGenDwarfAranges(MCOS, InfoSectionSymbol);
// Output the data for .debug_abbrev section.
EmitGenDwarfAbbrev(MCOS);

44
test/MC/ELF/gen-dwarf.s
View File

@ -1,8 +1,9 @@
// RUN: llvm-mc -g -triple i686-pc-linux-gnu %s -filetype=obj -o - | elf-dump | FileCheck %s
// Test that on ELF the debug info has a relocation to debug_abbrev and one to
// to debug_line.
// Test that on ELF:
// 1. the debug info has a relocation to debug_abbrev and one to to debug_line.
// 2. the debug_aranges has relocations to text and debug_line.
.text
@ -47,6 +48,34 @@ foo:
// CHECK: # Section 8
// CHECK-NEXT: (('sh_name', 0x00000001) # '.debug_abbrev'
// Section 9 is .debug_aranges
// CHECK: # Section 9
// CHECK-NEXT: (('sh_name', 0x0000001e) # '.debug_aranges'
// Two relocations in .debug_aranges, one to text and one to debug_info.
// CHECK: # '.rel.debug_aranges'
// CHECK: # Relocation 0
// CHECK-NEXT: (('r_offset', 0x00000006)
// CHECK-NEXT: ('r_sym', 0x000005)
// CHECK-NEXT: ('r_type', 0x01)
// CHECK-NEXT: ),
// CHECK-NEXT: # Relocation 1
// CHECK-NEXT: (('r_offset', 0x00000010)
// CHECK-NEXT: ('r_sym', 0x000001)
// CHECK-NEXT: ('r_type', 0x01)
// CHECK-NEXT: ),
// Symbol 1 is section 1 (.text)
// CHECK: # Symbol 1
// CHECK-NEXT: (('st_name', 0x00000000) # ''
// CHECK-NEXT: ('st_value', 0x00000000)
// CHECK-NEXT: ('st_size', 0x00000000)
// CHECK-NEXT: ('st_bind', 0x0)
// CHECK-NEXT: ('st_type', 0x3)
// CHECK-NEXT: ('st_other', 0x00)
// CHECK-NEXT: ('st_shndx', 0x0001)
// CHECK-NEXT: ),
// Symbol 4 is section 4 (.debug_line)
// CHECK: # Symbol 4
// CHECK-NEXT: (('st_name', 0x00000000) # ''
@ -58,6 +87,17 @@ foo:
// CHECK-NEXT: ('st_shndx', 0x0004)
// CHECK-NEXT: ),
// Symbol 5 is section 6 (.debug_info)
// CHECK: # Symbol 5
// CHECK-NEXT: (('st_name', 0x00000000) # ''
// CHECK-NEXT: ('st_value', 0x00000000)
// CHECK-NEXT: ('st_size', 0x00000000)
// CHECK-NEXT: ('st_bind', 0x0)
// CHECK-NEXT: ('st_type', 0x3)
// CHECK-NEXT: ('st_other', 0x00)
// CHECK-NEXT: ('st_shndx', 0x0006)
// CHECK-NEXT: ),
// Symbol 6 is section 8 (.debug_abbrev)
// CHECK: # Symbol 6
// CHECK-NEXT: (('st_name', 0x00000000) # ''