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Author SHA1 Message Date
Sam Clegg 199497086e [lld][WebAssembly] Delay creation of internal __wasm_memory_init function 
This also allows for its creation to be conditional so it is completely
elided when not needed.

Differential Revision: https://reviews.llvm.org/D93035
 2020-12-10 10:47:18 -08:00
Sam Clegg 29a3056bb5 [lld][WebAssembly] Allow references to __tls_base without shared memory 
Previously we limited the use of atomics and TLS to programs
linked with `--shared-memory`.

However, as of https://reviews.llvm.org/D79530 we now allow
programs that use atomic to be linked without `--shared-memory`.
For this to be useful we also want to all TLS usage in such
programs.  In this case, since we know we are single threaded
we simply include the TLS data as a regular active segment
and create an immutable `__tls_base` global that point to the
start of this segment.

Fixes: https://github.com/emscripten-core/emscripten/issues/12489

Differential Revision: https://reviews.llvm.org/D91115
 2020-11-10 17:58:06 -08:00
Sam Clegg 504cb2730c [lld][WebAssembly] Convert TLS tests to asm format 
Fix a corresponding bug in WasmAsmParser around parsing.tdata sections.

Differential Revision: https://reviews.llvm.org/D91113
 2020-11-10 11:38:53 -08:00