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llvm-project/llvm/test/CodeGen/RISCV/fixups-diff.ll

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[RISCV][MC] Don't fold symbol differences if requiresDiffExpressionRelocations is true When emitting the difference between two symbols, the standard behavior is that the difference will be resolved to an absolute value if both of the symbols are offsets from the same data fragment. This is undesirable on architectures such as RISC-V where relaxation in the linker may cause the computed difference to become invalid. This caused an issue when compiling to object code, where the size of a function in the debug information was already calculated even though it could change as a consequence of relaxation in the subsequent linking stage. This patch inhibits the resolution of symbol differences to absolute values where the target's AsmBackend has declared that it does not want these to be folded. Differential Revision: https://reviews.llvm.org/D45773 Patch by Edward Jones. llvm-svn: 339864
2018-08-16 19:26:37 +08:00
; RUN: llc -filetype=obj -mtriple=riscv32 -mattr=+relax %s -o - \
[llvm-readobj] Update tests because of changes in llvm-readobj behavior This patch updates tests using llvm-readobj and llvm-readelf, because soon reading from stdin will be achievable only via a '-' as described here: https://bugs.llvm.org/show_bug.cgi?id=46400. Patch with changes to llvm-readobj behavior is here: https://reviews.llvm.org/D83704 Differential Revision: https://reviews.llvm.org/D83912 Reviewed by: jhenderson, MaskRay, grimar
2020-07-20 15:39:14 +08:00
; RUN: | llvm-readobj -r - | FileCheck -check-prefix=RELAX %s
[RISCV][MC] Don't fold symbol differences if requiresDiffExpressionRelocations is true When emitting the difference between two symbols, the standard behavior is that the difference will be resolved to an absolute value if both of the symbols are offsets from the same data fragment. This is undesirable on architectures such as RISC-V where relaxation in the linker may cause the computed difference to become invalid. This caused an issue when compiling to object code, where the size of a function in the debug information was already calculated even though it could change as a consequence of relaxation in the subsequent linking stage. This patch inhibits the resolution of symbol differences to absolute values where the target's AsmBackend has declared that it does not want these to be folded. Differential Revision: https://reviews.llvm.org/D45773 Patch by Edward Jones. llvm-svn: 339864
2018-08-16 19:26:37 +08:00
; RUN: llc -filetype=obj -mtriple=riscv32 -mattr=-relax %s -o - \
[llvm-readobj] Update tests because of changes in llvm-readobj behavior This patch updates tests using llvm-readobj and llvm-readelf, because soon reading from stdin will be achievable only via a '-' as described here: https://bugs.llvm.org/show_bug.cgi?id=46400. Patch with changes to llvm-readobj behavior is here: https://reviews.llvm.org/D83704 Differential Revision: https://reviews.llvm.org/D83912 Reviewed by: jhenderson, MaskRay, grimar
2020-07-20 15:39:14 +08:00
; RUN: | llvm-readobj -r - | FileCheck -check-prefix=NORELAX %s
[RISCV][MC] Don't fold symbol differences if requiresDiffExpressionRelocations is true When emitting the difference between two symbols, the standard behavior is that the difference will be resolved to an absolute value if both of the symbols are offsets from the same data fragment. This is undesirable on architectures such as RISC-V where relaxation in the linker may cause the computed difference to become invalid. This caused an issue when compiling to object code, where the size of a function in the debug information was already calculated even though it could change as a consequence of relaxation in the subsequent linking stage. This patch inhibits the resolution of symbol differences to absolute values where the target's AsmBackend has declared that it does not want these to be folded. Differential Revision: https://reviews.llvm.org/D45773 Patch by Edward Jones. llvm-svn: 339864
2018-08-16 19:26:37 +08:00
; Check that a difference between two symbols in the same fragment
; causes relocations to be emitted if and only if relaxation is enabled.
;
; This specific test is checking that the size of the function in
; the debug information is represented by a relocation. This isn't
; an assembly test as the assembler takes a different path through
; LLVM, which is already covered by the fixups-expr.s test.
source_filename = "tmp.c"
target datalayout = "e-m:e-p:32:32-i64:64-n32-S128"
target triple = "riscv32"
define i32 @main() !dbg !7 {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval, align 4
ret i32 0
}
; RELAX: 0x22 R_RISCV_ADD32 - 0x0
; RELAX: 0x22 R_RISCV_SUB32 - 0x0
; RELAX: 0x2B R_RISCV_ADD32 - 0x0
; RELAX: 0x2B R_RISCV_SUB32 - 0x0
; NORELAX-NOT: R_RISCV_ADD32
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "fixups-diff.ll", directory: "test/MC/RISCV")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang"}
!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DILocation(line: 2, column: 3, scope: !7)