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6 Commits

Author SHA1 Message Date
Sam Clegg fd11ce32bb [WebAssembly] Import __stack_pointer when building -pie binaries 
The -pie binary doesn't know that layout ahead of time so needs to
import the stack pointer from the embedder, just like we do already
for shared libraries.

This change is needed in order to address:
https://github.com/emscripten-core/emscripten/issues/8915

Differential Revision: https://reviews.llvm.org/D64516

llvm-svn: 365771
 2019-07-11 13:13:25 +00:00
Dan Gohman ba86f2a22e [WebAssembly] Use Emscripten triples in PIC tests. 
With r362638, llc doesn't support -relocation-model=pic with non-Emscripten
triples. Update these tests in lld which use -relocation-model=pic to also
use Emscripten triples.

llvm-svn: 362645
 2019-06-05 20:59:20 +00:00
Sam Clegg ea38ac5ba3 [WebAssembly] Don't assume that strongly defined symbols are DSO-local 
The current PIC model for WebAssembly is more like ELF in that it
allows symbol interposition.

This means that more functions end up being addressed via the GOT
and fewer directly added to the wasm table.

One effect is a reduction in the number of wasm table entries similar
to the previous attempt in https://reviews.llvm.org/D61539 which was
reverted.

Differential Revision: https://reviews.llvm.org/D61772

llvm-svn: 360402
 2019-05-10 01:52:08 +00:00
Sam Clegg 08fa01a9b7 Revert "[WebAssembly] Don't generate unused table entries." 
This reverts commit b33fdb7768.

This change apparently broke am emscripten test.

llvm-svn: 360367
 2019-05-09 19:34:32 +00:00
Sam Clegg b33fdb7768 [WebAssembly] Don't generate unused table entries. 
When generating PIC output only relocations of type
R_WASM_TABLE_INDEX_REL_SLEB should generate table entries.

R_WASM_TABLE_INDEX_I32 get resolved at runtime via the auto-generated
__wasm_apply_relocs functions.

R_WASM_TABLE_INDEX_SLEB are not allowed in PIC code.

Differential Revision: https://reviews.llvm.org/D61539

llvm-svn: 360165
 2019-05-07 15:46:30 +00:00
Sam Clegg 99cf58339f [WebAssembly] Fix typo in relocation checking 
Runtime relocation are generated for relocations of type
R_WASM_MEMORY_ADDR_I32 when in PIC mode (either -shared or -pie).

Followup on https://reviews.llvm.org/D60882.

Differential Revision: https://reviews.llvm.org/D60992

llvm-svn: 358995
 2019-04-23 14:49:38 +00:00