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1879 Commits

Author SHA1 Message Date
Fangrui Song
bcc1e58448 [ELF] Allow --symbol-ordering-file and call graph profile to be used together 
Port https://reviews.llvm.org/D117354 from the MachO port.

If both --symbol-ordering-file and call graph profile are present, the
--symbol-ordering-file takes precedence, but the call graph profile is
still used for symbols that don't appear in the order file.

In addition, call graph profile described sections are now ordered
before other sections.
 2025-01-05 17:13:23 -08:00
Fangrui Song
8d2b070f07 [ELF] Internalize computeCacheDirectedSortOrder. NFC 
and delete an incorremtn comment about ctx.arg.callGraphProfile
 2025-01-05 16:19:09 -08:00
Brad Smith
52574b5f40 [ELF] Add support for PT_OPENBSD_NOBTCFI (#120005) 2024-12-19 19:41:42 -05:00
Peter Collingbourne
64da33a589 ELF: Introduce --randomize-section-padding option. 
The --randomize-section-padding option randomly inserts padding between
input sections using the given seed. It is intended to be used in A/B
experiments to determine the average effect of a change on program
performance, while controlling for effects such as false sharing in
the cache which may introduce measurement bias. For more details,
see the RFC:

https://discourse.llvm.org/t/rfc-lld-feature-for-controlling-for-code-size-dependent-measurement-bias/83334

Reviewers: smithp35, MaskRay

Reviewed By: MaskRay, smithp35

Pull Request: https://github.com/llvm/llvm-project/pull/117653
 2024-12-13 11:52:09 -08:00
Fangrui Song
3733ed6f1c [ELF] Introduce Symbol::isExported to cache includeInDynsym 
isExported, intended to replace exportDynamic, is primarily set in two
locations, (a) after parseSymbolVersion and (b) during demoteSymbols.

In the future, we should try removing exportDynamic. Currently,
merging exportDynamic/isExported would cause
riscv-gp.s to fail:

* The first isExported computation considers the undefined symbol exported
* Defined as a linker-synthesized symbol
* isExported remains true, while it should be false
 2024-12-08 22:40:14 -08:00
Fangrui Song
712264b83c [ELF] Merge parseSymbolVersion and computeIspreemptible 
ICF needs isPreemptible, which can be combined with parseSymbolVersion.
 2024-12-08 17:50:17 -08:00
Fangrui Song
8669028c18 [ELF] Remove unneeded sym->file check 
After #78944 and some follow-ups, sym->file, unless in the initial
Placeholder stage, is guaranteed to be non-null.
 2024-12-07 20:46:02 -08:00
pcc
970d6d2096 ELF: Have __rela_iplt_{start,end} surround .rela.iplt with --pack-dyn-relocs=android. 
In #86751 we moved the IRELATIVE relocations to .rela.plt when
--pack-dyn-relocs=android was enabled but we neglected to also move
the __rela_iplt_{start,end} symbols. As a result, static binaries
linked with this flag were unable to find their IRELATIVE relocations.
Fix it by having the symbols surround the correct section.

Reviewers: MaskRay, smithp35

Reviewed By: MaskRay

Pull Request: https://github.com/llvm/llvm-project/pull/118585
 2024-12-04 17:35:05 -08:00
Fangrui Song
ee19eb3037 [ELF] Change some upper-case utohexstr to lower-case to improve consistency 
The convention is to use lower-case addresses.
 2024-11-29 18:37:47 -08:00
Fangrui Song
1cd627562b [ELF] Remove unneeded Twine in ELFSyncStream 2024-11-24 12:13:02 -08:00
Fangrui Song
37e39667cc [ELF] Make ThunkCreator take ownership of thunks 
This removes many SpecificAlloc instantiations and makes my lld (x86-64
Release+Assertions) smaller by ~36k.
 2024-11-19 23:16:35 -08:00
Fangrui Song
a52032448e [ELF] Avoid make<PhdrEntry> 
Store them in Partition::phdrs instead.
 2024-11-19 22:38:14 -08:00
Fangrui Song
4092c0deef [ELF,ARM] Move global sectionMap into the ARM class 
Otherwise, LLD_IN_TEST=2 testing arm-plt-reloc.s crashes.

Follow-up to https://reviews.llvm.org/D150870
 2024-11-18 09:08:30 -08:00
Fangrui Song
5b1b6a62b8 [ELF] Make elfHeader/programHeaders unique_ptr 
This removes some SpecificAlloc instantiations, makes lld smaller, and
drops the small memory waste due to the separate BumpPtrAllocator.
 2024-11-17 00:25:42 -08:00
Fangrui Song
2991a4e209 [ELF] Replace functions bAlloc/saver/uniqueSaver with member access 2024-11-16 22:34:13 -08:00
Fangrui Song
8f238f662c [ELF] Make Ctx inherit from CommonLinkerContext 
link calls `new CommonLinkerContext`. Now that `Ctx ctx` is a local
variable, we can make it inherit from CommonLinkerContext.
 2024-11-16 22:28:55 -08:00
Fangrui Song
dc6229bd66 [lld] Use context-aware outs() and errs() 2024-11-16 18:25:51 -08:00
Fangrui Song
a626eb2a2f [ELF] Pass ctx to bAlloc/saver/uniqueSaver 2024-11-16 15:20:21 -08:00
Fangrui Song
24c7d97cff [ELF] Replace context-less errorHandler() and error() with ctx.errHandler 2024-11-16 14:14:54 -08:00
Fangrui Song
3fb83f65c4 [ELF] Replace toString(RelType) with operator<< while using ELFSyncStream 2024-11-16 11:45:46 -08:00
Fangrui Song
d82422f69c [ELF] Remove errorOrWarn 2024-11-15 09:37:38 -08:00
Fangrui Song
d69cc05bcf [ELF] Migrate away from global ctx 2024-11-14 22:30:29 -08:00
Fangrui Song
ed6c106e6a [ELF] Replace errorCount with errCount(ctx) 
to reduce reliance on the global context.
 2024-11-07 09:06:01 -08:00
Fangrui Song
9b058bb42d [ELF] Replace errorOrWarn(...) with Err 2024-11-06 22:33:51 -08:00
Fangrui Song
f8bae3af74 [ELF] Replace warn(...) with Warn 2024-11-06 22:19:31 -08:00
Fangrui Song
09c2c5e1e9 [ELF] Replace error(...) with ErrAlways or Err 
Most are migrated to ErrAlways mechanically.
In the future we should change most to Err.
 2024-11-06 22:04:52 -08:00
Fangrui Song
63c6fe4a0b [ELF] Replace fatal(...) with Fatal or Err 2024-11-06 21:17:26 -08:00
Fangrui Song
5d928ffce2 [ELF] Remove error-prone RelocationBaseSection::classof 2024-10-19 21:02:03 -07:00
Fangrui Song
861bd36bce [ELF] Pass Ctx & to Symbol::getVA 2024-10-19 20:32:58 -07:00
Fangrui Song
fe8af49a1b [ELF] Pass Ctx & to Defined & CommonSymbol 2024-10-20 01:38:16 +00:00
Fangrui Song
682925ef43 [ELF] Pass Ctx & to Partition 2024-10-15 22:58:07 -07:00
Fangrui Song
a3bad9adcb [ELF] Pass Ctx & 2024-10-12 09:56:05 -07:00
Fangrui Song
dbd197118d [ELF] Pass Ctx & to Symbol 2024-10-11 23:34:43 -07:00
Fangrui Song
dd326b1225 [ELF] Pass Ctx & 2024-10-11 21:10:05 -07:00
Fangrui Song
1c28f31133 [ELF] Pass Ctx & 2024-10-11 18:35:02 -07:00
Fangrui Song
81bd712f92 [ELF] Revert Ctx & parameters from SyntheticSection 
Since Ctx &ctx is a member variable,
1f391a75af
7a5b9ef54e
e2f0ec3a3a can be reverted.
 2024-10-10 23:43:21 -07:00
Fangrui Song
cfd3289a1f [ELF] Pass Ctx & to some free functions 2024-10-06 19:36:21 -07:00
Fangrui Song
5f6346190c [ELF] Pass Ctx & to SyntheticSections 2024-10-06 17:23:16 -07:00
Fangrui Song
f1dccda1b5 [ELF] Pass Ctx & to Symbols 2024-10-06 17:05:43 -07:00
Fangrui Song
b3e0bd3d28 [ELF] Pass Ctx & to Arch/ 2024-10-06 00:31:51 -07:00
Fangrui Song
6d03a69034 [ELF] Pass Ctx & to Arch/ 2024-10-06 00:14:12 -07:00
Fangrui Song
53a1fb0cd7 [ELF] Pass Ctx & 2024-10-05 09:37:27 -07:00
Fangrui Song
e2f0ec3a3a [ELF] Pass Ctx & to SyntheticSection::getSize 2024-10-03 22:53:07 -07:00
Fangrui Song
7a5b9ef54e [ELF] Pass Ctx & to SyntheticSection::writeTo 2024-10-03 20:56:09 -07:00
Fangrui Song
1f391a75af [ELF] Pass Ctx & to SyntheticSection::finalizeContents 2024-10-03 20:45:40 -07:00
Fangrui Song
3590068950 [ELF] Pass Ctx & to OutputSections 2024-10-03 20:06:58 -07:00
Fangrui Song
c490d349c5 [ELF] Pass Ctx & to Relocations 2024-09-29 16:15:32 -07:00
Fangrui Song
cc6c059dc1 [ELF] Pass Ctx & to Writer 2024-09-29 15:54:28 -07:00
Fangrui Song
17473182f5 [ELF] Pass Ctx & to MapFile 2024-09-29 15:39:52 -07:00
Fangrui Song
29783f70db [ELF] Pass Ctx & to Relocations 2024-09-28 19:17:18 -07:00