c77659e549
This patch provides two major changes: 1. Add getRelocationInfo to check if a constant will have static, dynamic, or no relocations. (Also rename the original needsRelocation to needsDynamicRelocation.) 2. Only allow a constant with no relocations (static or dynamic) to be placed in a mergeable section. This will allow unused symbols that contain static relocations and happen to fit in mergeable constant sections (.rodata.cstN) to instead be placed in unique-named sections if -fdata-sections is used and subsequently garbage collected by --gc-sections. See https://lists.llvm.org/pipermail/llvm-dev/2021-February/148281.html. Differential Revision: https://reviews.llvm.org/D95960
46 lines
1.7 KiB
LLVM
46 lines
1.7 KiB
LLVM
; RUN: llc -relocation-model=pic -data-sections -o - %s | FileCheck %s
|
|
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
@hidden = external hidden global i8
|
|
@default = external global i8
|
|
|
|
; CHECK: .section .rodata.rodata
|
|
; CHECK: rodata:
|
|
; CHECK: .long hidden-rodata
|
|
@rodata = hidden constant i32 trunc (i64 sub (i64 ptrtoint (i8* @hidden to i64), i64 ptrtoint (i32* @rodata to i64)) to i32)
|
|
|
|
; CHECK: .section .data.rel.ro.relro1
|
|
; CHECK: relro1:
|
|
; CHECK: .long default-relro1
|
|
@relro1 = hidden constant i32 trunc (i64 sub (i64 ptrtoint (i8* @default to i64), i64 ptrtoint (i32* @relro1 to i64)) to i32)
|
|
|
|
; CHECK: .section .data.rel.ro.relro2
|
|
; CHECK: relro2:
|
|
; CHECK: .long hidden-relro2
|
|
@relro2 = constant i32 trunc (i64 sub (i64 ptrtoint (i8* @hidden to i64), i64 ptrtoint (i32* @relro2 to i64)) to i32)
|
|
|
|
; CHECK: .section .rodata.obj
|
|
; CHECK-NEXT: .globl obj
|
|
; CHECK: obj:
|
|
; CHECK: .long 0
|
|
; CHECK: .long (hidden_func-obj)-4
|
|
|
|
declare hidden void @hidden_func()
|
|
|
|
; Ensure that inbound GEPs with constant offsets are also resolved.
|
|
@obj = dso_local unnamed_addr constant { { i32, i32 } } {
|
|
{ i32, i32 } {
|
|
i32 0,
|
|
i32 trunc (i64 sub (i64 ptrtoint (void ()* dso_local_equivalent @hidden_func to i64), i64 ptrtoint (i32* getelementptr inbounds ({ { i32, i32 } }, { { i32, i32 } }* @obj, i32 0, i32 0, i32 1) to i64)) to i32)
|
|
} }, align 4
|
|
|
|
; CHECK: .section .rodata.rodata2
|
|
; CHECK-NEXT: .globl rodata2
|
|
; CHECK: rodata2:
|
|
; CHECK: .long extern_func@PLT-rodata2
|
|
|
|
declare void @extern_func()
|
|
|
|
@rodata2 = dso_local constant i32 trunc (i64 sub (i64 ptrtoint (void ()* dso_local_equivalent @extern_func to i64), i64 ptrtoint (i32* @rodata2 to i64)) to i32)
|