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839d814b88
MC already knows how to emulate the .weak directive (with its ELF semantics; i.e., an undefined weak symbol resolves to 0, and a defined weak symbol has lower link precedence than a strong symbol of the same name) using COFF weak externals. Plumb this through the ASM printer too, so that definitions marked with __attribute__((weak)) at the language level (which gets translated to weak linkage at the IR level) have the corresponding .weak directive emitted. Note that declarations marked with __attribute__((weak)) at the language level (which translates to extern_weak at the IR level) already have .weak directives emitted. Weak*/linkonce* symbols without an associated comdat (in particular, ones generated with __attribute__((weak)) in C/C++) were earlier emitted as normal unique globals, as the comdat is required to provide the linkonce semantics. This change makes sure they are emitted as .weak instead, allowing other symbols to override them. Rename the existing coff-weak.ll test to coff-linkonce.ll. I'm not quite sure what that test covers, since the behavior being tested in it (the emission of a one_only section) is just a result of passing -function-sections to llc; the linkonce_odr makes no difference. Add a new coff-weak.ll which tests the new directive emission. Based on an previous patch by Shoaib Meenai. Differential Revision: https://reviews.llvm.org/D44543
142 lines
3.8 KiB
LLVM
142 lines
3.8 KiB
LLVM
; RUN: llc -mtriple i386-pc-win32 < %s \
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; RUN: | FileCheck -check-prefix CHECK -check-prefix CHECK-CL %s
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; RUN: llc -mtriple i386-pc-mingw32 < %s \
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; RUN: | FileCheck -check-prefix CHECK -check-prefix CHECK-GCC %s
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; RUN: llc -mtriple i686-pc-cygwin %s -o - \
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; RUN: | FileCheck -check-prefix CHECK -check-prefix CHECK-GCC %s
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; RUN: llc -mtriple i386-pc-win32 < %s \
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; RUN: | FileCheck -check-prefix NOTEXPORTED %s
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; RUN: llc -mtriple i386-pc-mingw32 < %s \
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; RUN: | FileCheck -check-prefix NOTEXPORTED %s
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; RUN: llc -mtriple i686-pc-cygwin %s -o - \
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; RUN: | FileCheck -check-prefix NOTEXPORTED %s
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; CHECK: .text
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define void @notExported() {
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ret void
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}
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; CHECK: .globl _f1
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define dllexport void @f1() {
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ret void
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}
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; CHECK: .globl _f2
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define dllexport void @f2() unnamed_addr {
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ret void
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}
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declare dllexport void @notDefined()
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; CHECK: .globl _stdfun@0
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define dllexport x86_stdcallcc void @stdfun() nounwind {
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ret void
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}
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; CHECK: .globl @fastfun@0
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define dllexport x86_fastcallcc i32 @fastfun() nounwind {
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ret i32 0
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}
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; CHECK: .globl _thisfun
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define dllexport x86_thiscallcc void @thisfun() nounwind {
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ret void
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}
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; CHECK: .globl _lnk1
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$lnk1 = comdat any
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define linkonce_odr dllexport void @lnk1() comdat {
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ret void
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}
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; CHECK: .globl _lnk2
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$lnk2 = comdat any
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define linkonce_odr dllexport void @lnk2() alwaysinline comdat {
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ret void
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}
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; CHECK: .weak _weak1
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define weak_odr dllexport void @weak1() {
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ret void
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}
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; CHECK: .data
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; CHECK: .globl _Var1
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@Var1 = dllexport global i32 1, align 4
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; CHECK: .rdata,"dr"
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; CHECK: .globl _Var2
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@Var2 = dllexport unnamed_addr constant i32 1
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; CHECK: .comm _Var3
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@Var3 = common dllexport global i32 0, align 4
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; CHECK: .weak _WeakVar1
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@WeakVar1 = weak_odr dllexport global i32 1, align 4
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; CHECK: .weak _WeakVar2
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@WeakVar2 = weak_odr dllexport unnamed_addr constant i32 1
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; CHECK: .globl _alias
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; CHECK: .set _alias, _notExported
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@alias = dllexport alias void(), void()* @notExported
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; CHECK: .globl _alias2
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; CHECK: .set _alias2, _f1
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@alias2 = dllexport alias void(), void()* @f1
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; CHECK: .globl _alias3
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; CHECK: .set _alias3, _notExported
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@alias3 = dllexport alias void(), void()* @notExported
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; CHECK: .weak _weak_alias
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; CHECK: .set _weak_alias, _f1
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@weak_alias = weak_odr dllexport alias void(), void()* @f1
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; Verify items that should not be exported do not appear in the export table.
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; We use a separate check prefix to avoid confusion between -NOT and -SAME.
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; NOTEXPORTED: .section .drectve
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; NOTEXPORTED-NOT: notExported
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; NOTEXPORTED-NOT: notDefined
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; CHECK: .section .drectve
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; CHECK-CL: .ascii " /EXPORT:_f1"
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; CHECK-CL: .ascii " /EXPORT:_f2"
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; CHECK-CL: .ascii " /EXPORT:_stdfun@0"
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; CHECK-CL: .ascii " /EXPORT:@fastfun@0"
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; CHECK-CL: .ascii " /EXPORT:_thisfun"
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; CHECK-CL: .ascii " /EXPORT:_lnk1"
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; CHECK-CL: .ascii " /EXPORT:_lnk2"
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; CHECK-CL: .ascii " /EXPORT:_weak1"
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; CHECK-CL: .ascii " /EXPORT:_Var1,DATA"
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; CHECK-CL: .ascii " /EXPORT:_Var2,DATA"
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; CHECK-CL: .ascii " /EXPORT:_Var3,DATA"
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; CHECK-CL: .ascii " /EXPORT:_WeakVar1,DATA"
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; CHECK-CL: .ascii " /EXPORT:_WeakVar2,DATA"
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; CHECK-CL: .ascii " /EXPORT:_alias"
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; CHECK-CL: .ascii " /EXPORT:_alias2"
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; CHECK-CL: .ascii " /EXPORT:_alias3"
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; CHECK-CL: .ascii " /EXPORT:_weak_alias"
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; CHECK-GCC: .ascii " -export:f1"
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; CHECK-GCC: .ascii " -export:f2"
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; CHECK-GCC: .ascii " -export:stdfun@0"
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; CHECK-GCC: .ascii " -export:@fastfun@0"
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; CHECK-GCC: .ascii " -export:thisfun"
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; CHECK-GCC: .ascii " -export:lnk1"
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; CHECK-GCC: .ascii " -export:lnk2"
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; CHECK-GCC: .ascii " -export:weak1"
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; CHECK-GCC: .ascii " -export:Var1,data"
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; CHECK-GCC: .ascii " -export:Var2,data"
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; CHECK-GCC: .ascii " -export:Var3,data"
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; CHECK-GCC: .ascii " -export:WeakVar1,data"
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; CHECK-GCC: .ascii " -export:WeakVar2,data"
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; CHECK-GCC: .ascii " -export:alias"
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; CHECK-GCC: .ascii " -export:alias2"
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; CHECK-GCC: .ascii " -export:alias3"
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; CHECK-GCC: .ascii " -export:weak_alias"
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