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5 Commits

Author SHA1 Message Date
Fangrui Song
30718f3aa6 [llvm-objcopy] --weaken-symbol/--weaken: weaken STB_GNU_UNIQUE symbols 
STB_GNU_UNIQUE is like STB_GLOBAL with extra semantics:

* gold and ld.lld: changed to STB_GLOBAL if --no-gnu-unique is specified
* glibc: unique even with dlopen `RTLD_LOCAL`, implies DF_1_NODELETE

Therefore, I think it makes sense for --weaken-symbol/--weaken-symbols/--weaken
to change STB_GNU_UNIQUE symbols.

binutils 2.39 will have the same behavior: https://sourceware.org/bugzilla/show_bug.cgi?id=28926

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D120638
 2022-03-16 09:48:19 -07:00
Fangrui Song
cce3521020 [llvm-objcopy] Simplify CompressedSection creation. NFC 
Remove Expected<CompressedSection> factory functions in favor of constructors
now that zlib::compress returns void (D121512).

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D121644
 2022-03-14 23:15:15 -07:00
Alexey Lapshin
a6f3fedc3f [objcopy] Refactor CommonConfig to add posibility to specify added/updated sections as MemoryBuffer. 
Current objcopy implementation has a possibility to add or update sections.
The incoming section is specified as a pair: section name and name of the file
containing section data. The interface does not allow to specify incoming
section as a memory buffer. This patch adds possibility to specify incoming
section as a memory buffer.

Differential Revision: https://reviews.llvm.org/D120486
 2022-03-01 14:49:41 +03:00
Alexey Lapshin
25d7b4fb44 [objcopy][NFC] Rename files to avoid clashing of archive members. 
libtool uses file names to name members of an static library.
Files, located in different directories and having matching name,
would have the same name inside an archive. This is not a problem
for ld, but may be a problem for ar. This patch renames files
from ObjCopy library to avoid names clashing.

See https://reviews.llvm.org/D88827#3335814

Differential Revision: https://reviews.llvm.org/D120345
 2022-02-23 13:05:39 +03:00
Alexey Lapshin
f75da0c8e6 [llvm-objcopy][NFC] Move core implementation of llvm-objcopy into separate library. 
This patch moves core implementation of llvm-objcopy into Object library
(http://lists.llvm.org/pipermail/llvm-dev/2020-September/145075.html).
The functionality for parsing input options is left inside tools/llvm-objcopy.
The interface of ObjCopy library:

ObjCopy/ELF/ELFObjcopy.h

```
Error executeObjcopyOnIHex(const CopyConfig &Config, MemoryBuffer &In,
                           Buffer &Out);
Error executeObjcopyOnRawBinary(const CopyConfig &Config, MemoryBuffer &In,
                                Buffer &Out);
Error executeObjcopyOnBinary(const CopyConfig &Config,
                             object::ELFObjectFileBase &In, Buffer &Out);

```
ObjCopy/COFF/COFFObjcopy.h

```
Error executeObjcopyOnBinary(const CopyConfig &Config,
                             object::COFFObjectFile &In, Buffer &Out);

```
ObjCopy/MachO/MachOObjcopy.h

```
Error executeObjcopyOnBinary(const CopyConfig &Config,
                             object::MachOObjectFile &In, Buffer &Out);

```
ObjCopy/wasm/WasmObjcopy.h

```
Error executeObjcopyOnBinary(const CopyConfig &Config,
                             object::WasmObjectFile &In, Buffer &Out);

```

Differential Revision: https://reviews.llvm.org/D88827
 2022-02-17 13:11:42 +03:00