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[llvm-objcopy][MachO] Implement --remove-section
Reviewers: alexshap, rupprecht, jhenderson Reviewed By: rupprecht, jhenderson Subscribers: jakehehrlich, abrachet, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D66282
This commit is contained in:
Seiya Nuta
parent
bc7414f606
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466f12f007
@ -107,6 +107,9 @@ multiple file formats.
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Remove the specified section from the output. Can be specified multiple times
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to remove multiple sections simultaneously.
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For MachO objects, ``<section>`` must be formatted as
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``<segment name>,<section name>``.
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.. option:: --set-section-alignment <section>=<align>
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Set the alignment of section ``<section>`` to `<align>``. Can be specified
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127
test/tools/llvm-objcopy/MachO/remove-section.test
Normal file
127
test/tools/llvm-objcopy/MachO/remove-section.test
Normal file
@ -0,0 +1,127 @@
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## Show that if --remove-section is given, llvm-objcopy removes sections
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## specified by the option.
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# RUN: yaml2obj %s > %t
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## Remove only __TEXT,__text section.
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# RUN: llvm-objcopy --remove-section __TEXT,__text %t %t2
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# RUN: llvm-readobj --sections --section-data %t2 \
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# RUN: | FileCheck %s --check-prefixes=COMMON,REMOVE-TEXT-ONLY
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## Remove multiple sections.
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# RUN: llvm-objcopy --remove-section __TEXT,__text --remove-section __DATA,__data %t %t3
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# RUN: llvm-readobj --sections --section-data %t3 \
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# RUN: | FileCheck %s --check-prefixes=COMMON,REMOVE-TEXT-AND-DATA
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# COMMON: Sections [
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# REMOVE-TEXT-ONLY-NEXT: Section {
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# REMOVE-TEXT-ONLY-NEXT: Index: 0
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# REMOVE-TEXT-ONLY-NEXT: Name: __data (5F 5F 64 61 74 61 00 00 00 00 00 00 00 00 00 00)
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# REMOVE-TEXT-ONLY-NEXT: Segment: __DATA (5F 5F 44 41 54 41 00 00 00 00 00 00 00 00 00 00)
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# REMOVE-TEXT-ONLY-NEXT: Address: 0x4
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# REMOVE-TEXT-ONLY-NEXT: Size: 0x4
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# REMOVE-TEXT-ONLY-NEXT: Offset: 264
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# REMOVE-TEXT-ONLY-NEXT: Alignment: 0
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# REMOVE-TEXT-ONLY-NEXT: RelocationOffset: 0x0
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# REMOVE-TEXT-ONLY-NEXT: RelocationCount: 0
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# REMOVE-TEXT-ONLY-NEXT: Type: Regular (0x0)
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# REMOVE-TEXT-ONLY-NEXT: Attributes [ (0x0)
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# REMOVE-TEXT-ONLY-NEXT: ]
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# REMOVE-TEXT-ONLY-NEXT: Reserved1: 0x0
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# REMOVE-TEXT-ONLY-NEXT: Reserved2: 0x0
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# REMOVE-TEXT-ONLY-NEXT: Reserved3: 0x0
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# REMOVE-TEXT-ONLY-NEXT: SectionData (
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# REMOVE-TEXT-ONLY-NEXT: 0000: DDAADDAA |....|
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# REMOVE-TEXT-ONLY-NEXT: )
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# REMOVE-TEXT-ONLY-NEXT: }
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# COMMON-NEXT: Section {
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# REMOVE-TEXT-ONLY-NEXT: Index: 1
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# REMOVE-TEXT-AND-DATA-NEXT: Index: 0
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# COMMON-NEXT: Name: __const (5F 5F 63 6F 6E 73 74 00 00 00 00 00 00 00 00 00)
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# COMMON-NEXT: Segment: __TEXT (5F 5F 54 45 58 54 00 00 00 00 00 00 00 00 00 00)
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# COMMON-NEXT: Address: 0x8
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# COMMON-NEXT: Size: 0x4
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# REMOVE-TEXT-ONLY-NEXT: Offset: 268
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# REMOVE-TEXT-AND-DATA-NEXT: Offset: 184
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# COMMON-NEXT: Alignment: 0
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# COMMON-NEXT: RelocationOffset: 0x0
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# COMMON-NEXT: RelocationCount: 0
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# COMMON-NEXT: Type: Regular (0x0)
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# COMMON-NEXT: Attributes [ (0x0)
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# COMMON-NEXT: ]
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# COMMON-NEXT: Reserved1: 0x0
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# COMMON-NEXT: Reserved2: 0x0
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# COMMON-NEXT: Reserved3: 0x0
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# COMMON-NEXT: SectionData (
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# COMMON-NEXT: 0000: EEFFEEFF |....|
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# COMMON-NEXT: )
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# COMMON-NEXT: }
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# COMMON-NEXT: ]
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## Keep all sections if the specified section name is not present in the
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## input. The output file should be the same as the input.
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# RUN: llvm-objcopy --remove-section __TEXT,__foo %t %t4
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# RUN: cmp %t %t4
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--- !mach-o
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FileHeader:
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magic: 0xFEEDFACF
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cputype: 0x01000007
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cpusubtype: 0x00000003
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filetype: 0x00000001
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ncmds: 1
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sizeofcmds: 312
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flags: 0x00002000
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reserved: 0x00000000
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LoadCommands:
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- cmd: LC_SEGMENT_64
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cmdsize: 312
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segname: ''
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vmaddr: 0
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vmsize: 12
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fileoff: 344
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filesize: 12
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maxprot: 7
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initprot: 7
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nsects: 3
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flags: 0
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Sections:
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- sectname: __text
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segname: __TEXT
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addr: 0x0000000000000000
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content: 'AABBCCDD'
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size: 4
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offset: 344
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align: 0
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reloff: 0x00000000
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nreloc: 0
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flags: 0x80000400
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reserved1: 0x00000000
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reserved2: 0x00000000
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reserved3: 0x00000000
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- sectname: __data
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segname: __DATA
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addr: 0x0000000000000004
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content: 'DDAADDAA'
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size: 4
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offset: 348
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align: 0
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reloff: 0x00000000
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nreloc: 0
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flags: 0x00000000
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reserved1: 0x00000000
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reserved2: 0x00000000
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reserved3: 0x00000000
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- sectname: __const
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segname: __TEXT
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addr: 0x0000000000000008
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content: 'EEFFEEFF'
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size: 4
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offset: 352
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align: 0
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reloff: 0x00000000
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nreloc: 0
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flags: 0x00000000
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reserved1: 0x00000000
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reserved2: 0x00000000
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reserved3: 0x00000000
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@ -23,6 +23,12 @@ using SectionPred = std::function<bool(const Section &Sec)>;
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static void removeSections(const CopyConfig &Config, Object &Obj) {
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SectionPred RemovePred = [](const Section &) { return false; };
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if (!Config.ToRemove.empty()) {
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RemovePred = [&Config, RemovePred](const Section &Sec) {
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return Config.ToRemove.matches(Sec.CanonicalName);
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};
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}
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if (Config.StripAll) {
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// Remove all debug sections.
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RemovePred = [RemovePred](const Section &Sec) {
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@ -34,7 +40,8 @@ static void removeSections(const CopyConfig &Config, Object &Obj) {
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}
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if (!Config.OnlySection.empty()) {
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RemovePred = [&Config, RemovePred](const Section &Sec) {
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// Overwrite RemovePred because --only-section takes priority.
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RemovePred = [&Config](const Section &Sec) {
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return !Config.OnlySection.matches(Sec.CanonicalName);
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};
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}
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@ -71,10 +78,10 @@ static Error handleArgs(const CopyConfig &Config, Object &Obj) {
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!Config.SectionsToRename.empty() || !Config.SymbolsToRename.empty() ||
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!Config.UnneededSymbolsToRemove.empty() ||
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!Config.SetSectionAlignment.empty() || !Config.SetSectionFlags.empty() ||
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!Config.ToRemove.empty() || Config.ExtractDWO || Config.KeepFileSymbols ||
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Config.LocalizeHidden || Config.PreserveDates || Config.StripAllGNU ||
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Config.StripDWO || Config.StripNonAlloc || Config.StripSections ||
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Config.Weaken || Config.DecompressDebugSections || Config.StripDebug ||
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Config.ExtractDWO || Config.KeepFileSymbols || Config.LocalizeHidden ||
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Config.PreserveDates || Config.StripAllGNU || Config.StripDWO ||
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Config.StripNonAlloc || Config.StripSections || Config.Weaken ||
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Config.DecompressDebugSections || Config.StripDebug ||
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Config.StripNonAlloc || Config.StripSections || Config.StripUnneeded ||
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Config.DiscardMode != DiscardType::None || !Config.SymbolsToAdd.empty() ||
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Config.EntryExpr) {
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