[WebAssembly] Add --export flag to force a symbol to be exported
This is useful for emscripten or other tools that want to
selectively exports symbols without necessarily changing the
source code.
Differential Revision: https://reviews.llvm.org/D42003
llvm-svn: 322408
diff --git a/lld/test/wasm/export.ll b/lld/test/wasm/export.ll
new file mode 100644
index 0000000..f5cc42c
--- /dev/null
+++ b/lld/test/wasm/export.ll
@@ -0,0 +1,29 @@
+; RUN: llc -filetype=obj -mtriple=wasm32-unknown-unknown-wasm %s -o %t.o
+; RUN: not lld -flavor wasm --export=missing -o %t.wasm %t.o 2>&1 | FileCheck -check-prefix=CHECK-ERROR %s
+; RUN: lld -flavor wasm --export=hidden_function -o %t.wasm %t.o
+; RUN: obj2yaml %t.wasm | FileCheck %s
+
+define hidden i32 @hidden_function() local_unnamed_addr {
+entry:
+ ret i32 0
+}
+
+define i32 @_start() local_unnamed_addr {
+entry:
+ ret i32 0
+}
+
+; CHECK-ERROR: error: symbol exported via --export not found: missing
+
+; CHECK: - Type: EXPORT
+; CHECK-NEXT: Exports:
+; CHECK-NEXT: - Name: memory
+; CHECK-NEXT: Kind: MEMORY
+; CHECK-NEXT: Index: 0
+; CHECK-NEXT: - Name: _start
+; CHECK-NEXT: Kind: FUNCTION
+; CHECK-NEXT: Index: 1
+; CHECK-NEXT: - Name: hidden_function
+; CHECK-NEXT: Kind: FUNCTION
+; CHECK-NEXT: Index: 0
+; CHECK-NEXT: - Type: CODE