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[WebAssembly] Use __stack_pointer global when writing wasm binary

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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
This commit is contained in:
Sam Clegg
2017-06-16 23:59:10 +00:00
parent 4f1fca270a
commit 9d24fb7ff3
17 changed files with 106 additions and 145 deletions
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4
llvm/lib/Object/WasmObjectFile.cpp
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@@ -325,6 +325,7 @@ Error WasmObjectFile::parseRelocSection(StringRef Name, const uint8_t *Ptr,
case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB:
case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32:
case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB:
case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB:
break;
case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_LEB:
case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_SLEB:
@@ -332,7 +333,8 @@ Error WasmObjectFile::parseRelocSection(StringRef Name, const uint8_t *Ptr,
Reloc.Addend = readVarint32(Ptr);
break;
default:
return make_error<GenericBinaryError>("Bad relocation type",
return make_error<GenericBinaryError>("Bad relocation type: " +
Twine(Reloc.Type),
object_error::parse_failed);
}
Section->Relocations.push_back(Reloc);