0e8f4ce31d
Symbols from LTO objects don't contain Wasm signatures, but we need a signature when we create undefined/stub functions for missing weakly undefined symbols. Luckily, after LTO, we know that symbols that are not referenced by a regular object file must not be needed in the final output so there is no need to generate undefined/stub function for them. Differential Revision: https://reviews.llvm.org/D126554
32 lines
894 B
LLVM
32 lines
894 B
LLVM
; RUN: llvm-as %s -o %t.o
|
|
; RUN: wasm-ld %t.o -o %t.wasm
|
|
; RUN: obj2yaml %t.wasm | FileCheck %s
|
|
|
|
; Test that undefined weak external functions are handled in the LTO case
|
|
; We had a bug where stub function generation was failing because functions
|
|
; that are in bitcode (pre-LTO) don't have signatures assigned.
|
|
|
|
target datalayout = "e-m:e-p:32:32-p10:8:8-p20:8:8-i64:64-n32:64-S128"
|
|
target triple = "wasm32-unknown-unknown"
|
|
|
|
declare extern_weak i32 @foo()
|
|
|
|
declare extern_weak i32 @bar()
|
|
|
|
; The reference to bar here will exist in the LTO file, but the LTO process will
|
|
; remove it, so it will never be referenced by an normal object file, and
|
|
; therefore never have a signature.
|
|
define void @unused_function() #0 {
|
|
entry:
|
|
%call2 = call i32 @bar()
|
|
ret void
|
|
}
|
|
|
|
define void @_start() #0 {
|
|
entry:
|
|
%call2 = call i32 @foo()
|
|
ret void
|
|
}
|
|
|
|
; CHECK: Name: 'undefined_weak:foo'
|