c468dc1b12
In the case of weakly defined symbols in shared libraries we now generate both an import and an export. The dynamic linker can then choose how a winner from among all the shared libraries that define a given symbol. Previously any direct usage of a weakly defined symbol would use the DSO-local definition (For example, even through there would be single address for a weakly defined function, each DSO could end up directly calling its local version). Fixes: https://github.com/emscripten-core/emscripten/issues/13773 Differential Revision: https://reviews.llvm.org/D108413
60 lines
2.1 KiB
ArmAsm
60 lines
2.1 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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# Verify the weakly defined fuctions (weak_func) are both
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# imported and exported, and that internal usage (direct call)
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# always uses the imported version.
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.globl weak_func
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.weak weak_func
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weak_func:
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.functype weak_func () -> (i32)
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i32.const 0
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end_function
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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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# CHECK: - Type: IMPORT
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# CHECK-NEXT: Imports:
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# CHECK-NEXT: - Module: env
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# CHECK-NEXT: Field: memory
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# CHECK-NEXT: Kind: MEMORY
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# CHECK-NEXT: Memory:
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# CHECK-NEXT: Minimum: 0x0
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# CHECK-NEXT: - Module: env
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# CHECK-NEXT: Field: __memory_base
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# CHECK-NEXT: Kind: GLOBAL
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# CHECK-NEXT: GlobalType: I32
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# CHECK-NEXT: GlobalMutable: false
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# CHECK-NEXT: - Module: env
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# CHECK-NEXT: Field: __table_base
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# CHECK-NEXT: Kind: GLOBAL
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# CHECK-NEXT: GlobalType: I32
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# CHECK-NEXT: GlobalMutable: false
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# CHECK-NEXT: - Module: env
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# CHECK-NEXT: Field: weak_func
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# CHECK-NEXT: Kind: FUNCTION
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# CHECK-NEXT: SigIndex: 0
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# CHECK: - Type: CUSTOM
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# CHECK-NEXT: Name: name
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# CHECK-NEXT: FunctionNames:
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# CHECK-NEXT: - Index: 0
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# CHECK-NEXT: Name: weak_func
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# CHECK-NEXT: - Index: 1
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# CHECK-NEXT: Name: __wasm_call_ctors
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# CHECK-NEXT: - Index: 2
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# CHECK-NEXT: Name: __wasm_apply_data_relocs
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# CHECK-NEXT: - Index: 3
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# CHECK-NEXT: Name: weak_func
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