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llvm-project/llvm/test/CodeGen/X86/x86-64-plt-relative-reloc.ll

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CodeGen: Use PLT relocations for relative references to unnamed_addr functions. The relative vtable ABI (PR26723) needs PLT relocations to refer to virtual functions defined in other DSOs. The unnamed_addr attribute means that the function's address is not significant, so we're allowed to substitute it with the address of a PLT entry. Also includes a bonus feature: addends for COFF image-relative references. Differential Revision: http://reviews.llvm.org/D17938 llvm-svn: 267211
2016-04-23 04:40:10 +08:00
; RUN: llc -mtriple=x86_64-unknown-linux -o - %s | FileCheck %s
@vtable = constant [5 x i32] [i32 0,
i32 trunc (i64 sub (i64 ptrtoint (void ()* @fn1 to i64), i64 ptrtoint (i32* getelementptr ([5 x i32], [5 x i32]* @vtable, i32 0, i32 1) to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (void ()* @fn2 to i64), i64 ptrtoint (i32* getelementptr ([5 x i32], [5 x i32]* @vtable, i32 0, i32 1) to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (void ()* @fn3 to i64), i64 ptrtoint (i32* getelementptr ([5 x i32], [5 x i32]* @vtable, i32 0, i32 1) to i64)) to i32),
i32 trunc (i64 sub (i64 ptrtoint (i8* @global4 to i64), i64 ptrtoint (i32* getelementptr ([5 x i32], [5 x i32]* @vtable, i32 0, i32 1) to i64)) to i32)
]
declare void @fn1() unnamed_addr
declare void @fn2() unnamed_addr
declare void @fn3()
@global4 = external unnamed_addr global i8
; CHECK: .long 0
; CHECK-NEXT: .long (fn1@PLT-vtable)-4
; CHECK-NEXT: .long (fn2@PLT-vtable)-4
; CHECK-NEXT: .long (fn3-vtable)-4
; CHECK-NEXT: .long (global4-vtable)-4