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Atomize the ObjC category list section. 

__DATA, __objc_catlist contains a list of pointers to categories.

We want to atomize it so that the ObjC pass can later optimize and remove
categories.  That will be a later patch.

llvm-svn: 259386
This commit is contained in:
Pete Cooper 2016-02-01 19:10:10 +00:00
parent 45dee06177
commit 4a92469260
2 changed files with 73 additions and 0 deletions
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3
lld/lib/ReaderWriter/MachO/MachONormalizedFileToAtoms.cpp
View File

@ -89,6 +89,7 @@ const MachORelocatableSectionToAtomType sectsToAtomType[] = {
ENTRY("__DATA", "__thread_bss", S_THREAD_LOCAL_ZEROFILL,
typeTLVInitialZeroFill),
ENTRY("__DATA", "__objc_imageinfo", S_REGULAR, typeObjCImageInfo),
ENTRY("__DATA", "__objc_catlist", S_REGULAR, typeObjC2CategoryList),
ENTRY("", "", S_INTERPOSING, typeInterposingTuples),
ENTRY("__LD", "__compact_unwind", S_REGULAR,
typeCompactUnwindInfo),
@ -181,6 +182,8 @@ void sectionParseInfo(DefinedAtom::ContentType atomType,
atomizeCU),
ENTRY(typeGOT, 4, scopeLinkageUnit, mergeByContent,
atomizePointerSize),
ENTRY(typeObjC2CategoryList, 4, scopeTranslationUnit, mergeByContent,
atomizePointerSize),
ENTRY(typeUnknown, 1, scopeGlobal, mergeNo,
atomizeAtSymbols)
};

70
lld/test/mach-o/objc-category-list-atom.yaml Normal file
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@ -0,0 +1,70 @@
# RUN: lld -flavor darwin -arch x86_64 -r -print_atoms %s -o %t | FileCheck %s
# RUN: lld -flavor darwin -arch x86_64 -r -print_atoms %t -o %t2 | FileCheck %s
--- !mach-o
arch: x86_64
file-type: MH_OBJECT
flags: [ MH_SUBSECTIONS_VIA_SYMBOLS ]
compat-version: 0.0
current-version: 0.0
has-UUID: false
OS: unknown
sections:
- segment: __DATA
section: __objc_catlist
type: S_REGULAR
attributes: [ S_ATTR_NO_DEAD_STRIP ]
alignment: 8
address: 0x00000000000003F8
content: [ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 ]
relocations:
- offset: 0x00000008
type: X86_64_RELOC_UNSIGNED
length: 3
pc-rel: false
extern: true
symbol: 0
- offset: 0x00000000
type: X86_64_RELOC_UNSIGNED
length: 3
pc-rel: false
extern: true
symbol: 1
undefined-symbols:
- name: __category1
type: N_UNDF
scope: [ N_EXT ]
value: 0x0000000000000000
- name: __category2
type: N_UNDF
scope: [ N_EXT ]
value: 0x0000000000000000
page-size: 0x00000000
...
# Make sure we atomize the category list section by pointer sized atoms.
# CHECK: path: '<linker-internal>'
# CHECK: defined-atoms:
# CHECK: - type: objc-category-list
# CHECK: content: [ 00, 00, 00, 00, 00, 00, 00, 00 ]
# CHECK: merge: by-content
# CHECK: alignment: 8
# CHECK: references:
# CHECK: - kind: pointer64
# CHECK: offset: 0
# CHECK: target: __category2
# CHECK: - type: objc-category-list
# CHECK: content: [ 00, 00, 00, 00, 00, 00, 00, 00 ]
# CHECK: merge: by-content
# CHECK: alignment: 8
# CHECK: references:
# CHECK: - kind: pointer64
# CHECK: offset: 0
# CHECK: target: __category1
# CHECK: undefined-atoms:
# CHECK: - name: __category1
# CHECK: - name: __category2
# CHECK: ...