1 files changed, 86 insertions, 0 deletions
diff --git a/test/wasm/weak-external.ll b/test/wasm/weak-external.ll
new file mode 100644
index 0000000000000..891f7666ec76e
--- /dev/null
+++ b/test/wasm/weak-external.ll
@@ -0,0 +1,86 @@
+; RUN: llc -mtriple wasm32-unknown-unknown-wasm -filetype=obj -o %t.o %s
+; RUN: lld -flavor wasm -strip-debug %t.o -o %t.wasm
+; RUN: obj2yaml %t.wasm | FileCheck %s
+
+; Test that undefined weak externals (global_var) and (foo) don't cause
+; link failures and resolve to zero.
+
+@global_var = extern_weak global i32, align 4
+
+declare extern_weak i32 @foo()
+
+define i8* @get_address_of_foo() #0 {
+entry:
+  ret i8* bitcast (i32 ()* @foo to i8*)
+}
+
+define i32* @get_address_of_global_var() #0 {
+  ret i32* @global_var
+}
+
+define i32 @_start() #0 {
+entry:
+    %0 = load i32, i32* @global_var, align 4
+    ret i32 %0
+}
+
+; CHECK:      --- !WASM
+; CHECK-NEXT: FileHeader:
+; CHECK-NEXT:   Version:         0x00000001
+; CHECK-NEXT: Sections:
+; CHECK-NEXT:   - Type:            TYPE
+; CHECK-NEXT:     Signatures:
+; CHECK-NEXT:       - Index:           0
+; CHECK-NEXT:         ReturnType:      I32
+; CHECK-NEXT:         ParamTypes:
+; CHECK-NEXT:   - Type:            FUNCTION
+; CHECK-NEXT:     FunctionTypes:   [ 0, 0, 0 ]
+; CHECK-NEXT:   - Type:            TABLE
+; CHECK-NEXT:     Tables:
+; CHECK-NEXT:       - ElemType:        ANYFUNC
+; CHECK-NEXT:         Limits:
+; CHECK-NEXT:           Flags:           [ HAS_MAX ]
+; CHECK-NEXT:           Initial:         0x00000002
+; CHECK-NEXT:           Maximum:         0x00000002
+; CHECK-NEXT:   - Type:            MEMORY
+; CHECK-NEXT:     Memories:
+; CHECK-NEXT:       - Initial:         0x00000002
+; CHECK-NEXT:   - Type:            GLOBAL
+; CHECK-NEXT:     Globals:
+; CHECK-NEXT:       - Type:            I32
+; CHECK-NEXT:         Mutable:         true
+; CHECK-NEXT:         InitExpr:
+; CHECK-NEXT:           Opcode:          I32_CONST
+; CHECK-NEXT:           Value:           66560
+; CHECK-NEXT:   - 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:           2
+; CHECK-NEXT:       - Name:            get_address_of_foo
+; CHECK-NEXT:         Kind:            FUNCTION
+; CHECK-NEXT:         Index:           0
+; CHECK-NEXT:       - Name:            get_address_of_global_var
+; CHECK-NEXT:         Kind:            FUNCTION
+; CHECK-NEXT:         Index:           1
+; CHECK-NEXT:   - Type:            ELEM
+; CHECK-NEXT:     Segments:
+; CHECK-NEXT:       - Offset:
+; CHECK-NEXT:           Opcode:          I32_CONST
+; CHECK-NEXT:           Value:           1
+; CHECK-NEXT:         Functions:       [ 0 ]
+; CHECK-NEXT:   - Type:            CODE
+; CHECK-NEXT:     Functions:
+; CHECK-NEXT:       - Locals:
+; CHECK-NEXT:         Body:            4181808080000B
+; CHECK-NEXT:       - Locals:
+; CHECK-NEXT:         Body:            41FFFFFFFF7F0B
+; CHECK-NEXT:       - Locals:
+; CHECK-NEXT:         Body:            41002802FFFFFFFF0F0B
+; CHECK-NEXT:   - Type:            CUSTOM
+; CHECK-NEXT:     Name:            linking
+; CHECK-NEXT:     DataSize:        0
+; CHECK-NEXT: ...