9d4e8c09f4
The current implementation generates a csect with a
".rodata.str.x.y" prefix for a MergeableCString variable definition.
However, a reference to such variable does not get the prefix in its
name because there's not enough information in the containing IR.
In particular, without seeing the initializer and absent of some other
indicators, we cannot tell that the referenced variable is a null-
terminated string.
When the AIX codegen in llvm was being developed, the prefixing was copied
from ELF without having the linker take advantage of the info.
Currently, the AIX linker does not have the capability to merge
MergeableCString variables. If such feature would ever get implemented,
the contract between the linker and compiler would have to be reconsidered.
Here's the before and after of this change:
```
@a = global i64 320255973571806, align 8
@strA = unnamed_addr constant [7 x i8] c"hello\0A\00", align 1 ;; Mergeable1ByteCString
@strB = unnamed_addr constant [8 x i8] c"Blahah\0A\00", align 1 ;; Mergeable1ByteCString
@strC = unnamed_addr constant [2 x i16] [i16 1, i16 0], align 2 ;; Mergeable2ByteCString
@strD = unnamed_addr constant [2 x i16] [i16 1, i16 1], align 2 ;; !isMergeableCString
@strE = external unnamed_addr constant [2 x i16], align 2
-fdata-sections:
.text extern .rodata.str1.1strA .text extern strA
0 SD RO 0 SD RO
.text extern .rodata.str1.1strB .text extern strB
0 SD RO 0 SD RO
.text extern .rodata.str2.2strC ===> .text extern strC
0 SD RO 0 SD RO
.text extern strD .text extern strD
0 SD RO 0 SD RO
.data extern a .data extern a
0 SD RW 0 SD RW
undef extern strE undef extern strE
0 ER UA 0 ER UA
-fno-data-sections:
.text unamex .rodata.str1.1 .text unamex .rodata
0 SD RO 0 SD RO
.text extern strA .text extern strA
0 LD RO 0 LD RO
.text extern strB .text extern strB
0 LD RO 0 LD RO
.text unamex .rodata.str2.2 ===> .text extern strC
0 SD RO 0 LD RO
.text extern strC .text extern strD
0 LD RO 0 LD RO
.text unamex .rodata .data unamex .data
0 SD RO 0 SD RW
.text extern strD .data extern a
0 LD RO 0 LD RW
.data unamex .data undef extern strE
0 SD RW 0 ER UA
.data extern a
0 LD RW
undef extern strE
0 ER UA
```
Reviewed by: David Tenty, Fangrui Song
Differential Revision: https://reviews.llvm.org/D156202
338 lines
13 KiB
LLVM
338 lines
13 KiB
LLVM
; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
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; RUN: -data-sections -xcoff-traceback-table=false < %s | \
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; RUN: FileCheck --check-prefixes=CHECK,CHECK32 %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc64-ibm-aix-xcoff -data-sections < %s | \
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; RUN: FileCheck --check-prefixes=CHECK,CHECK64 %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
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; RUN: -filetype=obj -data-sections -xcoff-traceback-table=false -o %t.o < %s
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; RUN: llvm-objdump -D --symbol-description %t.o | FileCheck --check-prefix=CHECKOBJ %s
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; RUN: llvm-readobj -s %t.o | FileCheck --check-prefix=CHECKSYM %s
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;; Test to see if the default is correct for -data-sections on AIX.
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
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; RUN: -xcoff-traceback-table=false < %s | \
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; RUN: FileCheck --check-prefixes=CHECK,CHECK32 %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc64-ibm-aix-xcoff < %s | \
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; RUN: FileCheck --check-prefixes=CHECK,CHECK64 %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
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; RUN: -xcoff-traceback-table=false -filetype=obj -o %t.o < %s
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; RUN: llvm-objdump -D --symbol-description %t.o | FileCheck --check-prefix=CHECKOBJ %s
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; RUN: llvm-readobj -s %t.o | FileCheck --check-prefix=CHECKSYM %s
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;; Test to see if the default is correct for -data-sections on AIX.
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
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; RUN: -xcoff-traceback-table=false < %s | \
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; RUN: FileCheck --check-prefixes=CHECK,CHECK32 %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc64-ibm-aix-xcoff \
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; RUN: -xcoff-traceback-table=false < %s | \
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; RUN: FileCheck --check-prefixes=CHECK,CHECK64 %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr4 -mattr=-altivec -mtriple powerpc-ibm-aix-xcoff \
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; RUN: -xcoff-traceback-table=false -filetype=obj -o %t.o < %s
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; RUN: llvm-objdump -D --symbol-description %t.o | FileCheck --check-prefix=CHECKOBJ %s
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; RUN: llvm-readobj -s %t.o | FileCheck --check-prefix=CHECKSYM %s
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@ivar = local_unnamed_addr global i32 35, align 4
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@const_ivar = constant i32 35, align 4
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@a = common global i32 0, align 4
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@f = common local_unnamed_addr global i32 0, align 4
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@.str = private unnamed_addr constant [9 x i8] c"abcdefgh\00", align 1
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@p = global ptr @.str, align 4
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define i8 @foo() {
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entry:
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%0 = load ptr, ptr @p, align 4
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%1 = load i8, ptr %0, align 1
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ret i8 %1
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}
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define i32 @bar() {
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entry:
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%0 = load i32, ptr @ivar, align 4
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%1 = load i32, ptr @const_ivar, align 4
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%add = add nsw i32 %0, %1
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%2 = load i32, ptr @a, align 4
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%add1 = add nsw i32 %add, %2
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%3 = load i32, ptr @f, align 4
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%add2 = add nsw i32 %add1, %3
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ret i32 %add2
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}
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; CHECK: .csect ivar[RW],2
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; CHECK-NEXT: .globl ivar[RW]
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; CHECK-NEXT: .align 2
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; CHECK-NEXT: .vbyte 4, 35 # 0x23
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; CHECK-NEXT: .csect const_ivar[RO],2
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; CHECK-NEXT: .globl const_ivar[RO]
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; CHECK-NEXT: .align 2
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; CHECK-NEXT: .vbyte 4, 35 # 0x23
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; CHECK-NEXT: .comm a[RW],4,2
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; CHECK-NEXT: .comm f[RW],4,2
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; CHECK-NEXT: .csect L...str[RO],2
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; CHECK-NEXT: .string "abcdefgh"
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; CHECK32: .csect p[RW],2
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; CHECK32-NEXT: .globl p[RW]
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; CHECK32-NEXT: .align 2
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; CHECK32-NEXT: .vbyte 4, L...str[RO]
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; CHECK64: .csect p[RW],3
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; CHECK64-NEXT: .globl p[RW]
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; CHECK64-NEXT: .align 3
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; CHECK64-NEXT: .vbyte 8, L...str[RO]
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; CHECK: .toc
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; CHECK-NEXT: L..C0:
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; CHECK-NEXT: .tc p[TC],p[RW]
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; CHECK-NEXT: L..C1:
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; CHECK-NEXT: .tc ivar[TC],ivar[RW]
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; CHECK-NEXT: L..C2:
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; CHECK-NEXT: .tc a[TC],a[RW]
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; CHECK-NEXT: L..C3:
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; CHECK-NEXT: .tc f[TC],f[RW]
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; CHECKOBJ: 00000038 (idx: 7) const_ivar[RO]:
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; CHECKOBJ-NEXT: 38: 00 00 00 23 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 0000003c (idx: 9) L...str[RO]:
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; CHECKOBJ-NEXT: 3c: 61 62 63 64
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; CHECKOBJ-NEXT: 40: 65 66 67 68
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; CHECKOBJ-NEXT: 44: 00 00 00 00 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: Disassembly of section .data:
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 00000048 (idx: 11) ivar[RW]:
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; CHECKOBJ-NEXT: 48: 00 00 00 23 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 0000004c (idx: 13) p[RW]:
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; CHECKOBJ-NEXT: 4c: 00 00 00 3c <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 00000050 (idx: 15) foo[DS]:
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; CHECKOBJ-NEXT: 50: 00 00 00 00 <unknown>
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; CHECKOBJ-NEXT: 54: 00 00 00 68 <unknown>
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; CHECKOBJ-NEXT: 58: 00 00 00 00 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 0000005c (idx: 17) bar[DS]:
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; CHECKOBJ-NEXT: 5c: 00 00 00 10 <unknown>
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; CHECKOBJ-NEXT: 60: 00 00 00 68 <unknown>
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; CHECKOBJ-NEXT: 64: 00 00 00 00 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 00000068 (idx: 21) p[TC]:
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; CHECKOBJ-NEXT: 68: 00 00 00 4c <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 0000006c (idx: 23) ivar[TC]:
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; CHECKOBJ-NEXT: 6c: 00 00 00 48 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 00000070 (idx: 25) a[TC]:
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; CHECKOBJ-NEXT: 70: 00 00 00 78 <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 00000074 (idx: 27) f[TC]:
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; CHECKOBJ-NEXT: 74: 00 00 00 7c <unknown>
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: Disassembly of section .bss:
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 00000078 (idx: 29) a[RW]:
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; CHECKOBJ-NEXT: ...
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; CHECKOBJ-EMPTY:
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; CHECKOBJ-NEXT: 0000007c (idx: 31) f[RW]:
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; CHECKOBJ-NEXT: ...
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: const_ivar
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; CHECKSYM: Value (RelocatableAddress): 0x38
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; CHECKSYM: Section: .text
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_EXT (0x2)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_RO (0x1)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: L...str
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; CHECKSYM: Value (RelocatableAddress): 0x3C
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; CHECKSYM: Section: .text
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_HIDEXT (0x6B)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 9
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_RO (0x1)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: ivar
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; CHECKSYM: Value (RelocatableAddress): 0x48
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_EXT (0x2)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_RW (0x5)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: p
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; CHECKSYM: Value (RelocatableAddress): 0x4C
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_EXT (0x2)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_RW (0x5)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: TOC
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; CHECKSYM: Value (RelocatableAddress): 0x68
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_HIDEXT (0x6B)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 0
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_TC0 (0xF)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: p
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; CHECKSYM: Value (RelocatableAddress): 0x68
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_HIDEXT (0x6B)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_TC (0x3)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: ivar
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; CHECKSYM: Value (RelocatableAddress): 0x6C
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_HIDEXT (0x6B)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_TC (0x3)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: a
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; CHECKSYM: Value (RelocatableAddress): 0x70
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_HIDEXT (0x6B)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_TC (0x3)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: f
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; CHECKSYM: Value (RelocatableAddress): 0x74
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; CHECKSYM: Section: .data
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_HIDEXT (0x6B)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_SD (0x1)
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; CHECKSYM: StorageMappingClass: XMC_TC (0x3)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: a
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; CHECKSYM: Value (RelocatableAddress): 0x78
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; CHECKSYM: Section: .bss
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_EXT (0x2)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_CM (0x3)
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; CHECKSYM: StorageMappingClass: XMC_RW (0x5)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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; CHECKSYM: Symbol {
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; CHECKSYM: Name: f
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; CHECKSYM: Value (RelocatableAddress): 0x7C
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; CHECKSYM: Section: .bss
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; CHECKSYM: Type: 0x0
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; CHECKSYM: StorageClass: C_EXT (0x2)
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; CHECKSYM: NumberOfAuxEntries: 1
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; CHECKSYM: CSECT Auxiliary Entry {
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; CHECKSYM: SectionLen: 4
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; CHECKSYM: ParameterHashIndex: 0x0
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; CHECKSYM: TypeChkSectNum: 0x0
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; CHECKSYM: SymbolAlignmentLog2: 2
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; CHECKSYM: SymbolType: XTY_CM (0x3)
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; CHECKSYM: StorageMappingClass: XMC_RW (0x5)
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; CHECKSYM: StabInfoIndex: 0x0
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; CHECKSYM: StabSectNum: 0x0
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; CHECKSYM: }
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; CHECKSYM: }
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