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10 Commits

Author SHA1 Message Date
Nicholas Wilson 6c7fe30a1c [WebAssembly] Implement --print-gc-sections for synthetic functions 
Enables cleaning up confusion between which name variables are mangled
and which are unmangled, and --print-gc-sections then excersises and
tests that.

Differential Revision: https://reviews.llvm.org/D44440

llvm-svn: 330449
 2018-04-20 17:09:18 +00:00
Nicholas Wilson 2e55ee77e2 [WebAssembly] Handle weak undefined functions with a synthetic stub 
This error case is described in Linking.md. The operand for call requires
generation of a synthetic stub.

Differential Revision: https://reviews.llvm.org/D44028

llvm-svn: 327151
 2018-03-09 17:06:38 +00:00
Sam Clegg 9310297438 [WebAssembly] Add explicit symbol table 
This change modified lld to in response the llvm change which
moved to a more explicit symbol table in the object format.

Based on patches by Nicholas Wilson:
 1. https://reviews.llvm.org/D41955
 2. https://reviews.llvm.org/D42585

The primary difference that we see in the test output is that
for relocatable (-r) output we now have symbol table which
replaces exports/imports and globals.

See: https://github.com/WebAssembly/tool-conventions/issues/38
Differential Revision: https://reviews.llvm.org/D43264

llvm-svn: 325861
 2018-02-23 05:08:53 +00:00
Sam Clegg 00245539b6 [WebAssembly] Rename GlobalSymbol types. NFC. 
Purely a rename in preparation for adding new global symbol type.

We want to use GlobalSymbol to represent real wasm globals and
DataSymbol for pointers to things in linear memory (what ELF would
call STT_OBJECT).

This reduces the size the patch to add the explicit symbol table
which is coming soon!

Differential Revision: https://reviews.llvm.org/D43476

llvm-svn: 325645
 2018-02-20 23:38:27 +00:00
Rui Ueyama 34133b23e4 [WebAssembly] Expand a lambda that is used only once. 
Differential Revision: https://reviews.llvm.org/D43435

llvm-svn: 325536
 2018-02-19 22:34:47 +00:00
Rui Ueyama 81bee04bf9 [WebAssembly] Define toString(wasm::InputChunk *) and use that in MarkLive.cpp. 
Define toString(wasm::InputChunk *) and use that in MarkLive.cpp.

Differential Revision: https://reviews.llvm.org/D43434

llvm-svn: 325535
 2018-02-19 22:29:48 +00:00
Sam Clegg 6d83fb4c07 [WebAssembly] Remove unneeded Chunk::getFileName() method. NFC. 
Differential Revision: https://reviews.llvm.org/D43405

llvm-svn: 325414
 2018-02-16 23:46:51 +00:00
Sam Clegg 3d1f4b954d [WebAssembly] Fix typos in comment. NFC. 
Patch by Nicholas Wilson!

llvm-svn: 325370
 2018-02-16 18:37:32 +00:00
Sam Clegg f0d433d0c6 [WebAssembly] Refactor linker-generated symbols. NFC. 
Group all synthetic symbols in the in single struct to match
the ELF linker.

This change is part of a larger change to add more linker
symbols such as `_end` and `_edata`.

Differential Revision: https://reviews.llvm.org/D42866

llvm-svn: 324157
 2018-02-02 22:59:56 +00:00
Sam Clegg 0362633fd2 [WebAssembly] Add support for --gc-sections 
In this initial version we only GC symbols with `hidden` visibility since
other symbols we export to the embedder.

We could potentially modify this the future and only use symbols
explicitly passed via `--export` as GC roots.

This version of the code only does GC of data and code. GC for the
types section is coming soon.

Differential Revision: https://reviews.llvm.org/D42511

llvm-svn: 323842
 2018-01-31 01:45:47 +00:00