[WebAssembly] Apply data relocations at runtime in shared objects

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

Data section relocations in wasm shared libraries are applied by the
library itself at static constructor time.  This change adds a new
synthetic function that applies relocations to relevant memory locations
on startup.

Differential Revision: https://reviews.llvm.org/D59278

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357715 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/BinaryFormat/Wasm.h b/include/llvm/BinaryFormat/Wasm.h
index 443c2a5d2c627c8f15db6dd8b3bf2ca82aeee9bf..ee48a187f8e6e164049fc749024e71a04bd926a7 100644 (file)
--- a/include/llvm/BinaryFormat/Wasm.h
+++ b/include/llvm/BinaryFormat/Wasm.h
@@ -241,11 +241,14 @@ enum : unsigned {
 // Opcodes used in initializer expressions.
 enum : unsigned {
   WASM_OPCODE_END = 0x0b,
+  WASM_OPCODE_CALL = 0x10,
   WASM_OPCODE_GLOBAL_GET = 0x23,
+  WASM_OPCODE_I32_STORE = 0x36,
   WASM_OPCODE_I32_CONST = 0x41,
   WASM_OPCODE_I64_CONST = 0x42,
   WASM_OPCODE_F32_CONST = 0x43,
   WASM_OPCODE_F64_CONST = 0x44,
+  WASM_OPCODE_I32_ADD = 0x6a,
 };
 
 enum : unsigned {