b0f18af30b
A LazySymbol is one that lives in `.a` archive and gets pulled in by a strong reference. However, weak references to such symbols do not result in them be loaded from the archive. In this case we want to treat such symbols at undefined rather then lazy, once symbols resolution is complete. This fixes a crash bug in the linker when weakly referenced symbol that lives in an archive file is live at the end of the link. In the case of dynamic linking this is expected to turn into an import with (in the case of a function symbol) a function index. Differential Revision: https://reviews.llvm.org/D130736
62 lines
2.3 KiB
ArmAsm
62 lines
2.3 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.o %s
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# RUN: wasm-ld --experimental-pic -shared -o %t.wasm %t.o
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# RUN: obj2yaml %t.wasm | FileCheck %s
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# RUN: llvm-objdump -d %t.wasm | FileCheck %s -check-prefix=ASM
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# Run the same test but include a definition of ret32 in a library file.
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# This verifies that LazySymbols (those found in library archives) are correctly
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# demoted to undefined symbols in the final link when they are only weakly
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# referenced.
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# RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown -o %t.ret32.o %p/Inputs/ret32.s
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# RUN: rm -f %T/libret32.a
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# RUN: llvm-ar cru %T/libret32.a %t.ret32.o
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# RUN: wasm-ld --experimental-pic -shared -o %t.ret32.wasm %t.o %T/libret32.a
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# RUN: obj2yaml %t.wasm | FileCheck %s
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# RUN: llvm-objdump -d %t.wasm | FileCheck %s -check-prefix=ASM
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# Verify the weak undefined symbols are marked as such in the
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# dylink section.
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.weak weak_func
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.functype weak_func () -> (i32)
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.weak ret32
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.functype ret32 (f32) -> (i32)
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.globl call_weak
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call_weak:
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# ASM: <call_weak>:
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.functype call_weak () -> (i32)
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call weak_func
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# ASM: 10 80 80 80 80 00 call 0
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end_function
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# ASM-NEXT: 0b end
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# This function is defined in library archive, but since our reference to it
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# is weak we don't expect this definition to be used. Instead we expect it to
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# act like an undefined reference and result in an imported function.
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.globl call_weak_libfunc
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call_weak_libfunc:
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# ASM: <call_weak_libfunc>:
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.functype call_weak_libfunc () -> (i32)
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f32.const 1.0
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call ret32
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# ASM: 10 81 80 80 80 00 call 1
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end_function
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# ASM-NEXT: 0b end
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# CHECK: Sections:
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# CHECK-NEXT: - Type: CUSTOM
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# CHECK-NEXT: Name: dylink.0
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# CHECK-NEXT: MemorySize: 0
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# CHECK-NEXT: MemoryAlignment: 0
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# CHECK-NEXT: TableSize: 0
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# CHECK-NEXT: TableAlignment: 0
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# CHECK-NEXT: Needed: []
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# CHECK-NEXT: ImportInfo:
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# CHECK-NEXT: - Module: env
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# CHECK-NEXT: Field: weak_func
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# CHECK-NEXT: Flags: [ BINDING_WEAK, UNDEFINED ]
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# CHECK-NEXT: - Module: env
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# CHECK-NEXT: Field: ret32
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# CHECK-NEXT: Flags: [ BINDING_WEAK, UNDEFINED ]
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