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llvm-project/llvm/test/tools/lto/hide-linkonce-odr.ll

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Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
; RUN: llvm-as %s -o %t.o
[LIT][Darwin] Change %ld64 to be prefixed with DYLD_INSERT_LIBRARIES Followup from r277778, after Mehdi's comments. Expand %ld64 to perform the necessary preload instead, that way new tests do not need to worry about setting up DYLD_INSERT_LIBRARIES themselves. rdar://problem/24300926 llvm-svn: 277788
2016-08-05 07:58:30 +08:00
; RUN: %ld64 -lto_library %llvmshlibdir/libLTO.dylib -dylib -arch x86_64 -macosx_version_min 10.10.0 -lSystem -o %t.dylib %t.o -save-temps -undefined dynamic_lookup -exported_symbol _c -exported_symbol _b -exported_symbol _GlobLinkonce
Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
; RUN: llvm-dis %t.dylib.lto.opt.bc -o - | FileCheck --check-prefix=IR %s
LTOCodeGenerator: add linkonce(_odr) to "llvm.compiler.used" when present in "MustPreserve" set If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607
2016-05-05 13:14:24 +08:00
; check that @a is no longer a linkonce_odr definition
; IR-NOT: define linkonce_odr void @a()
; check that @b is appended in llvm.used
; IR: @llvm.compiler.used = appending global [2 x i8*] [i8* bitcast ([1 x i8*]* @GlobLinkonce to i8*), i8* bitcast (void ()* @b to i8*)], section "llvm.metadata"
Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
; RUN: llvm-nm %t.dylib | FileCheck --check-prefix=NM %s
LTOCodeGenerator: add linkonce(_odr) to "llvm.compiler.used" when present in "MustPreserve" set If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607
2016-05-05 13:14:24 +08:00
; check that the linker can hide @a but not @b, nor @GlobLinkonce
; NM: 0000000000000f48 S _GlobLinkonce
Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
; NM: 0000000000000f10 t _a
; NM: 0000000000000f20 T _b
; NM: 0000000000000f00 T _c
LTOCodeGenerator: add linkonce(_odr) to "llvm.compiler.used" when present in "MustPreserve" set If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607
2016-05-05 13:14:24 +08:00
Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
target triple = "x86_64-apple-macosx10.10.0"
declare void @external()
LTOCodeGenerator: add linkonce(_odr) to "llvm.compiler.used" when present in "MustPreserve" set If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607
2016-05-05 13:14:24 +08:00
@GlobLinkonce = linkonce_odr unnamed_addr constant [1 x i8*] [i8* null], align 8
Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
define linkonce_odr void @a() noinline {
LTOCodeGenerator: add linkonce(_odr) to "llvm.compiler.used" when present in "MustPreserve" set If the linker requested to preserve a linkonce function, we should honor this even if we drop all uses. We explicitely avoid turning them into weak_odr (unlike the first version of this patch in r267644), because the codegen can be different on Darwin: because of `llvm::canBeOmittedFromSymbolTable()` we may emit the symbol as weak_def_can_be_hidden instead of weak_definition. From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 268607
2016-05-05 13:14:24 +08:00
%use_of_GlobLinkonce = load [1 x i8*], [1 x i8*] *@GlobLinkonce
Add a test showing when ld64 can hide linkonce_odr symbols. llvm-svn: 257903
2016-01-16 00:40:20 +08:00
call void @external()
ret void
}
define linkonce_odr void @b() {
ret void
}
define void()* @c() {
call void @a()
ret void()* @b
}