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[lld][ELF] process fini_array sections 

This change processes fini_array section in addition to processing
init_array sections. This also makes functions registered at compile
time for initialization and finalization to be run during execution

llvm-svn: 189196
This commit is contained in:
Shankar Easwaran 2013-08-25 18:05:12 +00:00
parent 12d8089b8e
commit be81dd757e
6 changed files with 43 additions and 1 deletions
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2
lld/lib/ReaderWriter/ELF/Atoms.h
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@ -326,6 +326,7 @@ public:
ret = typeZeroFill;
break;
case llvm::ELF::SHT_INIT_ARRAY:
case llvm::ELF::SHT_FINI_ARRAY:
ret = typeData;
break;
}
@ -432,6 +433,7 @@ public:
return _permissions = permRW_;
case llvm::ELF::SHT_INIT_ARRAY:
case llvm::ELF::SHT_FINI_ARRAY:
return _permissions = permRW_;
default:

1
lld/lib/ReaderWriter/ELF/DefaultLayout.h
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@ -329,6 +329,7 @@ Layout::SectionOrder DefaultLayout<ELFT>::getSectionOrder(
case DefinedAtom::typeDataFast:
return llvm::StringSwitch<Reference::Kind>(name)
.StartsWith(".init_array", ORDER_INIT_ARRAY)
.StartsWith(".fini_array", ORDER_FINI_ARRAY)
.Default(ORDER_DATA);
case DefinedAtom::typeZeroFill:

4
lld/lib/ReaderWriter/ELF/File.h
View File

@ -181,7 +181,9 @@ public:
}
// Create a sectionSymbols entry for every progbits section.
if (section->sh_type == llvm::ELF::SHT_PROGBITS)
if ((section->sh_type == llvm::ELF::SHT_PROGBITS) ||
(section->sh_type == llvm::ELF::SHT_INIT_ARRAY) ||
(section->sh_type == llvm::ELF::SHT_FINI_ARRAY))
_sectionSymbols[section];
if (section->sh_type == llvm::ELF::SHT_RELA) {

14
lld/test/elf/X86_64/Inputs/initfini.c Normal file
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@ -0,0 +1,14 @@
#include <stdio.h>
void __attribute__ ((constructor)) constructor() {
printf("%s\n", __FUNCTION__);
}
void __attribute__ ((destructor)) destructor() {
printf("%s\n", __FUNCTION__);
}
int main() {
return 0;
}

BIN
lld/test/elf/X86_64/Inputs/initfini.o Normal file
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23
lld/test/elf/X86_64/initfini.test Normal file
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@ -0,0 +1,23 @@
# This tests the functionality that lld is able to read
# init_array/fini_array sections in the input ELF. This
# corresponds to the the .init_array/.fini_array sections
# in the output ELF.
RUN: lld -flavor gnu -target x86_64-linux %p/Inputs/initfini.o \
RUN: --noinhibit-exec -emit-yaml -o %t
RUN: FileCheck %s < %t
CHECK: - type: data
CHECK: content: [ 00, 00, 00, 00, 00, 00, 00, 00 ]
CHECK: section-name: .init_array
CHECK: references:
CHECK: - kind: R_X86_64_64
CHECK: offset: 0
CHECK: target: constructor
CHECK: - type: data
CHECK: content: [ 00, 00, 00, 00, 00, 00, 00, 00 ]
CHECK: section-name: .fini_array
CHECK: references:
CHECK: - kind: R_X86_64_64
CHECK: offset: 0
CHECK: target: destructor