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8 Commits

Author SHA1 Message Date
Sam Clegg 9abe8c4805 [lld][WebAssembly] Report undefined symbols during scanRelocations 
This puts handling of undefined symbols in a single location.  Its
also more in line with the ELF backend which only reports undefined
symbols based on relocations.

One side effect is that we no longer report undefined symbols that are
only referenced in GC'd sections.

This also fixes a crash reported in the emscripten toolchain:
https://github.com/emscripten-core/emscripten/issues/8930.

Differential Revision: https://reviews.llvm.org/D64280

llvm-svn: 365553
 2019-07-09 20:45:20 +00:00
Sam Clegg d0e1d00397 [lld][WebAssembly] Fix typo in error message 
Differential Revision: https://reviews.llvm.org/D64315

llvm-svn: 365304
 2019-07-08 09:34:30 +00:00
Sam Clegg 7cdec273dd [WebAssembly] Error on relocations against undefined data symbols. 
We can't (currently) meaningfully resolve certain types of relocations
against undefined data symbols.  Previously when `--allow-undefined` was
used we were treating such relocation much like weak data symbols and
simply inserting zeros.  This change turns such use cases in to an
error.

This means that `--allow-undefined` is no longer effective for data
symbols.

Fixes https://bugs.llvm.org/show_bug.cgi?id=40364

Differential Revision: https://reviews.llvm.org/D60882

llvm-svn: 358899
 2019-04-22 16:12:54 +00:00
Sam Clegg 09137be7f8 [WebAssembly] Apply data relocations at runtime in shared objects 
See: https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md

Data section relocations in wasm shared libraries are applied by the
library itself at static constructor time.  This change adds a new
synthetic function that applies relocations to relevant memory locations
on startup.

Differential Revision: https://reviews.llvm.org/D59278

llvm-svn: 357715
 2019-04-04 18:40:51 +00:00
Sam Clegg e3a845e25e Re-land "[WebAssembly] Improve invalid relocation error message"" 
See https://reviews.llvm.org/D59860

The initial version of this change effected more than just the
error message.  This version is scoped down to only effect the error
itself.

llvm-svn: 357328
 2019-03-29 22:56:39 +00:00
Derek Schuff 0c9ea10530 Revert "[WebAssembly] Improve invalid relocation error message" 
This reverts commit 0805ec5f7b.

llvm-svn: 357225
 2019-03-29 00:05:00 +00:00
Sam Clegg 0805ec5f7b [WebAssembly] Improve invalid relocation error message 
This message now matches the equivalent message in the ELF linker.

Differential Revision: https://reviews.llvm.org/D59860

llvm-svn: 357143
 2019-03-28 02:02:07 +00:00
Sam Clegg 632c217921 [WebAssembly] Error on R_WASM_MEMORY_ADDR relocations against undefined data symbols. 
For these types of relocations an absolute memory address is
required which is not possible for undefined data symbols.  For symbols
that can be undefined at link time (i.e. external data symbols in
shared libraries) a different type of relocation (i.e. via a GOT) will
be needed.

Differential Revision: https://reviews.llvm.org/D59337

llvm-svn: 356310
 2019-03-16 01:18:12 +00:00