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4 Commits

Author SHA1 Message Date
Fangrui Song 962b29d716 ELFObjectWriter: Don't sort non-local symbols 
As we don't sort local symbols, don't sort non-local symbols.  This makes
non-local symbols appear in their register order, which matches GNU as. The
register order is nice in that you can write tests with interleaved CHECK
prefixes, e.g.

```
// CHECK: something about foo
.globl foo
foo:
// CHECK: something about bar
.globl bar
bar:
```

With the lexicographical order, the user needs to place lexicographical smallest
symbol first or keep CHECK prefixes in one place.
 2021-02-13 10:32:27 -08:00
Fangrui Song a2028f73c2 Update SHT_LLVM_PART_EHDR test after r371157 
llvm-svn: 371160
 2019-09-06 01:18:01 +00:00
Fangrui Song 4514ac7cfb [ELF] Align SHT_LLVM_PART_EHDR to a maximum page size boundary 
Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=998712

SHT_LLVM_PART_EHDR marks the start of a partition. The partition
sections will be extracted to a separate file. Align to the next maximum
page size boundary so that we can find the ELF header at the start. We
cannot benefit from overlapping p_offset ranges with the previous
segment anyway.

It seems we lack some llvm-objcopy --extract-main-partition and
--extract-partition sanity checks. It may place EHDR at the start
even if p_offset if non zero. Anyway, the lld change is justified for
the reasons above.

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D67032

llvm-svn: 370629
 2019-09-02 08:49:50 +00:00
Peter Collingbourne ba2816be82 ELF: Add basic partition data structures and behaviours. 
This change causes us to read partition specifications from partition
specification sections and split output sections into partitions according
to their reachability from partition entry points.

This is only the first step towards a full implementation of partitions. Later
changes will add additional synthetic sections to each partition so that
they can be loaded independently.

Differential Revision: https://reviews.llvm.org/D60353

llvm-svn: 361925
 2019-05-29 03:55:20 +00:00