; 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: ...