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3 Commits

Author SHA1 Message Date
Dan Gohman 53572d0470 [WebAssembly] Limit PIC support to the Emscripten target 
The current PIC support currently only works with Emscripten, so
disable it for other targets.

This is the PIC portion of https://reviews.llvm.org/D62542.

Reviewed By: dschuff, sbc100

llvm-svn: 362638
 2019-06-05 20:01:01 +00:00
Sam Clegg 2a7cac932b [WebAssembly] Add new explicit relocation types for PIC relocations 
See https://github.com/WebAssembly/tool-conventions/pull/106

Differential Revision: https://reviews.llvm.org/D59907

llvm-svn: 357710
 2019-04-04 17:43:50 +00:00
Sam Clegg 492f752969 [WebAssembly] Initial implementation of PIC code generation 
This change implements lowering of references global symbols in PIC
mode.

This change implements lowering of global references in PIC mode using a
new @GOT reference type. @GOT references can be used with function or
data symbol names combined with the get_global instruction. In this case
the linker will insert the wasm global that stores the address of the
symbol (either in memory for data symbols or in the wasm table for
function symbols).

For now I'm continuing to use the R_WASM_GLOBAL_INDEX_LEB relocation
type for this type of reference which means that this relocation type
can refer to either a global or a function or data symbol. We could
choose to introduce specific relocation types for GOT entries in the
future.  See the current dynamic linking proposal:

https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md

Differential Revision: https://reviews.llvm.org/D54647

llvm-svn: 357022
 2019-03-26 19:46:15 +00:00