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