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d41ca54775
dso_local leads to direct access even if the definition is not within this compilation unit (it is still in the same linkage unit). On ELF, such a relocation (e.g. R_X86_64_PC32) referencing a STB_GLOBAL STV_DEFAULT object can cause a linker error in a -shared link. If the linkage is changed to available_externally, the dso_local flag should be dropped, so that no direct access will be generated. The current behavior is benign, because -fpic does not assume dso_local (clang/lib/CodeGen/CodeGenModule.cpp:shouldAssumeDSOLocal). If we do that for -fno-semantic-interposition (D73865), there will be an R_X86_64_PC32 linker error without this patch. Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D74751
29 lines
1004 B
LLVM
29 lines
1004 B
LLVM
;; The same as index-const-prop-gvref.ll, except for PIE.
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; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/index-const-prop-gvref.ll -o %t2.bc
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; RUN: llvm-lto2 run -save-temps %t2.bc -r=%t2.bc,b,pl -r=%t2.bc,a,pl \
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; RUN: %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,a, -r=%t1.bc,b, -o %t3
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; RUN: llvm-dis %t3.2.3.import.bc -o - | FileCheck %s --check-prefix=DEST
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;; For PIE, keep dso_local for declarations to enable direct access.
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; DEST: @b = external dso_local global i32*
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; DEST-NEXT: @a = available_externally dso_local global i32 42, align 4
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@a = external global i32
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@b = external global i32*
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define i32 @main() {
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%p = load i32*, i32** @b, align 8
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store i32 33, i32* %p, align 4
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%v = load i32, i32* @a, align 4
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ret i32 %v
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 7, !"PIE Level", i32 2}
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!1 = !{i32 7, !"PIC Level", i32 2}
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