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[lld][test] Precommit test for ld -r links with FatLTO PIC objects #92817

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merged 6 commits into from
May 31, 2024
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[lld][test] Precommit test for ld -r links with FatLTO PIC objects #92817

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7ae4266
[𝘀𝗽𝗿] initial version
ilovepi May 20, 2024
c09de94
Fix filename in RUN line
ilovepi May 20, 2024
44140c1
Reuse existing objects in test
ilovepi May 21, 2024
f02bd6e
Set section type to SHT_LLVM_LTO
ilovepi May 21, 2024
cded743
Update test to use llvm-readelf
ilovepi May 23, 2024
8318fad
CD into temp dir
ilovepi May 23, 2024
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78 changes: 52 additions & 26 deletions lld/test/ELF/fatlto/fatlto.test
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Original file line number Diff line number Diff line change
@@ -1,53 +1,79 @@
;; Basic FatLTO tests.
; REQUIRES: x86

; RUN: rm -rf %t && split-file %s %t
; RUN: rm -rf %t && split-file %s %t && cd %t

;; Ensure that input files contain .llvm.lto section.
; RUN: llc %t/a-LTO.ll --filetype=obj -o %t/a-fatLTO.o
; RUN: opt < %t/a-LTO.ll --module-summary -o %t/a-fatLTO.bc
; RUN: llvm-objcopy --add-section=.llvm.lto=%t/a-fatLTO.bc --set-section-flags=.llvm.lto=exclude %t/a-fatLTO.o
; RUN: llc a-LTO.ll --filetype=obj -o a-fatLTO.o --relocation-model=pic
; RUN: opt < a-LTO.ll --module-summary -o a-fatLTO.bc
; RUN: llvm-objcopy --add-section=.llvm.lto=a-fatLTO.bc --set-section-flags=.llvm.lto=exclude --set-section-type=.llvm.lto=0x6fff4c0c a-fatLTO.o

; RUN: llc %t/main-LTO.ll --filetype=obj -o %t/main-fatLTO.o
; RUN: opt < %t/main-LTO.ll --module-summary -o %t/main-fatLTO.bc
; RUN: llvm-objcopy --add-section=.llvm.lto=%t/main-fatLTO.bc --set-section-flags=.llvm.lto=exclude %t/main-fatLTO.o

; RUN: llc main-LTO.ll --filetype=obj -o main-fatLTO.o --relocation-model=pic
; RUN: opt < main-LTO.ll --module-summary -o main-fatLTO.bc
; RUN: llvm-objcopy --add-section=.llvm.lto=main-fatLTO.bc --set-section-flags=.llvm.lto=exclude --set-section-type=.llvm.lto=0x6fff4c0c main-fatLTO.o

; RUN: llvm-readelf -S a-fatLTO.o | FileCheck --check-prefix=HAS_LLVM_LTO %s
; RUN: llvm-readelf -S main-fatLTO.o | FileCheck --check-prefix=HAS_LLVM_LTO %s

;; Make sure that the section flags are set correctly
; HA_LLVM_LTO: Name: .llvm.lto
; HA_LLVM_LTO-NEXT: Type: SHT_LLVM_LTO
; HA_LLVM_LTO-NEXT: Flags
; HA_LLVM_LTO-NEXT: SHF_EXCLUDE

; HAS_LLVM_LTO: Name Type Address Off Size ES Flg Lk Inf Al
; HAS_LLVM_LTO: .llvm.lto LLVM_LTO {{.*}} 00 WE 0 0 1

;; Final executable should not have .llvm.lto section no matter what the target is.
; RUN: ld.lld -o %t/foo-fatLTO %t/a-fatLTO.o %t/main-fatLTO.o --fat-lto-objects
; RUN: llvm-readobj -S %t/foo-fatLTO | FileCheck --check-prefix=CHECK-LTO-TARGET %s
; RUN: ld.lld -o foo-fatLTO a-fatLTO.o main-fatLTO.o --fat-lto-objects
; RUN: llvm-readelf -S foo-fatLTO | FileCheck --check-prefix=CHECK-LTO-TARGET %s

;; Check that fat objects work w/ --start-lib.
; RUN: ld.lld -o %t/foo-fatLTO.start_lib --start-lib %t/a-fatLTO.o %t/main-fatLTO.o --fat-lto-objects
; RUN: llvm-readobj -S %t/foo-fatLTO.start_lib | FileCheck --check-prefix=CHECK-LTO-TARGET %s
; RUN: ld.lld -o foo-fatLTO.start_lib --start-lib a-fatLTO.o main-fatLTO.o --fat-lto-objects
; RUN: llvm-readelf -S foo-fatLTO.start_lib | FileCheck --check-prefix=CHECK-LTO-TARGET %s

;; Check if .llvm.lto section gets aggregated in LTO target.
; CHECK-LTO-TARGET-NOT: Name: .llvm.lto
; CHECK-LTO-TARGET: Name Type Address Off Size ES Flg Lk Inf Al
; CHECK-LTO-TARGET-NOT: .llvm.lto

;; Final executable should not have .llvm.lto section no matter what the target is.
; RUN: ld.lld -o %t/foo-fatNoLTO %t/a-fatLTO.o %/t/main-fatLTO.o
; RUN: llvm-readobj -S %t/foo-fatNoLTO | FileCheck --check-prefix=CHECK-NON-LTO-TARGET %s
; RUN: ld.lld -o foo-fatNoLTO a-fatLTO.o %/t/main-fatLTO.o
; RUN: llvm-readelf -S foo-fatNoLTO | FileCheck --check-prefix=CHECK-NON-LTO-TARGET %s

;; Check if .llvm.lto section gets aggregated in non-LTO target.
; CHECK-NON-LTO-TARGET-NOT: Name: .llvm.lto
; CHECK-NON-LTO-TARGET: Name Type Address Off Size ES Flg Lk Inf Al
; CHECK-NON-LTO-TARGET-NOT: .llvm.lto

;; Check if the LTO target executable produced from FatLTO object file is
;; identical to the one produced from LTO modules.
; RUN: opt < %t/a-LTO.ll --module-summary -o %t/a-LTO.bc
; RUN: opt < %t/main-LTO.ll --module-summary -o %t/main-LTO.bc
; RUN: ld.lld -o %t/foo-LTO %t/a-LTO.bc %t/main-LTO.bc
; RUN: cmp %t/foo-fatLTO %t/foo-LTO
; RUN: opt < a-LTO.ll --module-summary -o a-LTO.bc
; RUN: opt < main-LTO.ll --module-summary -o main-LTO.bc
; RUN: ld.lld -o foo-LTO a-LTO.bc main-LTO.bc
; RUN: cmp foo-fatLTO foo-LTO

;; Check if the no-LTO target executable produced from FatLTO object file is
;; identical to the one produced from regular object files.
; RUN: llc %t/a-LTO.ll --filetype=obj -o %t/a.o
; RUN: llc %t/main-LTO.ll --filetype=obj -o %t/main.o
; RUN: ld.lld -o %t/foo-noLTO %t/a.o %t/main.o
; RUN: cmp %t/foo-fatNoLTO %t/foo-noLTO
; RUN: llc a-LTO.ll --filetype=obj -o a.o
; RUN: llc main-LTO.ll --filetype=obj -o main.o
; RUN: ld.lld -o foo-noLTO a.o main.o
; RUN: cmp foo-fatNoLTO foo-noLTO

;; Check archive support.
; RUN: llvm-ar rcs %t/a.a %t/a-fatLTO.o
; RUN: ld.lld -o %t/foo-fatLTO.archive %t/a.a %t/main-LTO.bc --fat-lto-objects
; RUN: cmp %t/foo-fatLTO.archive %t/foo-LTO
; RUN: llvm-ar rcs a.a a-fatLTO.o
; RUN: ld.lld -o foo-fatLTO.archive a.a main-LTO.bc --fat-lto-objects
; RUN: cmp foo-fatLTO.archive foo-LTO

;; Test FatLTO works with relocatable links using PIC objects
;; Currently, with PIC relocatable links, FatLTO sections are treated as
;; orphan sections and incorrectly concatenated together. This test verifies
;; the current behavior, but should be fixed to either merge those sections
;; correctly, or to drop them altogether.
; RUN: llvm-ar rcs fatLTO-pic.a a-fatLTO.o main-fatLTO.o
; RUN: llvm-readelf -S fatLTO-pic.a | FileCheck --check-prefix=HAS_LLVM_LTO %s

; RUN: ld.lld --whole-archive fatLTO-pic.a -r -o fatLTO-pic-reolcatable.o
; RUN: llvm-readelf -S fatLTO-pic-reolcatable.o | FileCheck --check-prefix=HAS_LLVM_LTO %s

;--- a-LTO.ll
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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