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3 Commits

Author SHA1 Message Date
Sam Clegg 9d24fb7ff3 [WebAssembly] Use __stack_pointer global when writing wasm binary 
This ensures that symbolic relocations are generated for stack
pointer manipulations.

These relocations are of type R_WEBASSEMBLY_GLOBAL_INDEX_LEB.
This change also adds support for reading relocations of this
type in WasmObjectFile.cpp.

Since its a globally imported symbol this does mean that
the get_global/set_global instruction won't be valid until
the objects are linked that global used in no longer an
imported global.

Differential Revision: https://reviews.llvm.org/D34172

llvm-svn: 305616
 2017-06-16 23:59:10 +00:00
Dan Gohman 82607f56bd [WebAssembly] Add support for using a wasm global for the stack pointer. 
This replaces the __stack_pointer variable which was allocated in linear
memory.

llvm-svn: 296201
 2017-02-24 23:46:05 +00:00
Derek Schuff 0d41b7b3f3 [WebAssembly] Emit a BasePointer when we have overly-aligned stack objects 
Because we shift the stack pointer by an unknown amount, we need an
additional pointer. In the case where we have variable-size objects
as well, we can't reuse the frame pointer, thus three pointers.

Patch by Jacob Gravelle

Differential Revision: https://reviews.llvm.org/D26263

llvm-svn: 286160
 2016-11-07 22:00:48 +00:00