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ELF's lack of linker directives is worked around by a custom section (`.swift1_autolink_entries`). This is metadata that is not intended to be emitted into the linked binary. A previous change introduced the use of a module (global) assembly gadget to discard the section. However, this interacts poorly with ASAN which would instrument the section, resulting in a strong reference. This reference would persist to a discarded symbol. lld would object to this. Blacklist the symbol to ensure that ASAN + autolinking can co-exist.
28 lines
938 B
Swift
28 lines
938 B
Swift
// RUN: %swiftc_driver -emit-ir %s -o - | %FileCheck %s -check-prefix ELF
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// Check that the swift auto link section is available in the object file.
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// RUN: %swiftc_driver -c %s -o %t
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// RUN: llvm-readelf %t -S | %FileCheck %s -check-prefix SECTION
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// Checks that the swift auto link section is removed from the final binary.
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// RUN: %swiftc_driver -emit-executable %s -o %t
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// RUN: llvm-readelf %t -S | %FileCheck %s -check-prefix NOSECTION
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// REQUIRES: OS=linux-gnu
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print("Hi from Swift!")
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// ELF: module asm ".section .swift1_autolink_entries,\220x80000000\22"
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// Find the metadata entry for the blacklisting of the metadata symbol
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// Ensure that it is in the ASAN metadata
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// ELF-DAG: !llvm.asan.globals = !{
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// ELF-SAME: [[MD:![0-9]+]]
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// ELF-SAME: }
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// ELF-DAG: [[MD]] = !{[37 x i8]* @_swift1_autolink_entries, null, null, i1 false, i1 true}
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// SECTION: .swift1_autolink_entries
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// NOSECTION-NOT: .swift1_autolink_entries
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