[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
diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
index 19e14f3..9cf7782 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
@@ -68,6 +68,8 @@
bool IsFunction = IsFunctionExpr(Fixup.getValue());
switch (unsigned(Fixup.getKind())) {
+ case WebAssembly::fixup_code_global_index:
+ return wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB;
case WebAssembly::fixup_code_sleb128_i32:
if (IsFunction)
return wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB;