mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
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
43 lines
1.8 KiB
LLVM
43 lines
1.8 KiB
LLVM
; RUN: opt -module-summary %s -o %t1.bc
|
|
; RUN: opt -module-summary %p/Inputs/index-const-prop-alias.ll -o %t2.bc
|
|
; RUN: llvm-lto2 run %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,ret_ptr,pl -r=%t1.bc,g.alias,l -r=%t1.bc,g,l \
|
|
; RUN: %t2.bc -r=%t2.bc,g,pl -r=%t2.bc,g.alias,pl -save-temps -o %t3
|
|
; RUN: llvm-dis %t3.1.3.import.bc -o - | FileCheck %s --check-prefix=IMPORT
|
|
; RUN: llvm-dis %t3.1.5.precodegen.bc -o - | FileCheck %s --check-prefix=CODEGEN
|
|
|
|
; When ret_ptr is preserved we return pointer to alias, so we can't internalize aliasee
|
|
; RUN: llvm-lto2 run %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,ret_ptr,plx -r=%t1.bc,g.alias,l -r=%t1.bc,g,l \
|
|
; RUN: %t2.bc -r=%t2.bc,g,pl -r=%t2.bc,g.alias,pl -save-temps -o %t4
|
|
; RUN: llvm-dis %t4.1.3.import.bc -o - | FileCheck %s --check-prefix=PRESERVED
|
|
|
|
; When g.alias is preserved we can't internalize aliasee either
|
|
; RUN: llvm-lto2 run %t1.bc -r=%t1.bc,main,plx -r=%t1.bc,ret_ptr,pl -r=%t1.bc,g.alias,l -r=%t1.bc,g,l \
|
|
; RUN: %t2.bc -r=%t2.bc,g,pl -r=%t2.bc,g.alias,plx -save-temps -o %t5
|
|
; RUN: llvm-dis %t5.1.3.import.bc -o - | FileCheck %s --check-prefix=PRESERVED
|
|
|
|
; We currently don't support importing aliases
|
|
; IMPORT: @g.alias = external global i32
|
|
; IMPORT-NEXT: @g = internal global i32 42, align 4 #0
|
|
; IMPORT: attributes #0 = { "thinlto-internalize" }
|
|
|
|
; CODEGEN: define dso_local i32 @main
|
|
; CODEGEN-NEXT: ret i32 42
|
|
|
|
; PRESERVED: @g.alias = external global i32
|
|
; PRESERVED-NEXT: @g = available_externally global i32 42, align 4
|
|
|
|
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
@g.alias = external global i32
|
|
@g = external global i32
|
|
|
|
define i32 @main() {
|
|
%v = load i32, i32* @g
|
|
ret i32 %v
|
|
}
|
|
|
|
define i32* @ret_ptr() {
|
|
ret i32* @g.alias
|
|
}
|