bf67610a8a
Temporary symbols generated for .eh_frame and .debug_line have an empty name, which appear in .symtab in the presence of RISC-V style linker relaxation and will not be discarded by ld/objcopy --discard-locals (-X). In contrast, GNU assembler's riscv port assigns a fake name ".L0 " (with a trailing space) to these symbols so that will be discarded by ld/objcopy --discard-locals. This patch matches the GNU behavior. Since Clang's RISC-V targets pass -X to ld, and GNU ld defaults to -X for RISC-V targets, these ".L0 " symbols will be discarded after linking by default, as expected by users. The llvm-symbolizer special case for RISC-V `SF_FormatSpecific` symbols https://reviews.llvm.org/D98669 needs to be adjusted. Note: `"":` in assembly currently crashes. Note: bolt tests used /usr/bin/clang before llvmorg-19-init-9532-g59bfc3106874. The revert llvmorg-19-init-9531-g28b55342e1a8 actually broke bolt/test/RISCV/fake-label-no-entry.c
49 lines
1.7 KiB
LLVM
49 lines
1.7 KiB
LLVM
; RUN: llc -filetype=obj -mtriple=riscv32 -mattr=+relax %s -o - \
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; RUN: | llvm-readobj -r - | FileCheck %s
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; RUN: llc -filetype=obj -mtriple=riscv32 -mattr=-relax %s -o - \
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; RUN: | llvm-readobj -r - | FileCheck %s
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;; b-a in the inline asm is unaffected by linker relaxation, so we don't emit
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;; relocations.
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;; b-a in the inline asm and DW_AT_high_pc are unaffected by linker relaxation,
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;; so we don't emit ADD/SUB relocations.
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;; See also MC/RISCV/fixups-expr.s.
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source_filename = "tmp.c"
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target datalayout = "e-m:e-p:32:32-i64:64-n32-S128"
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target triple = "riscv32"
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define i32 @main() !dbg !7 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, ptr %retval, align 4
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call void asm sideeffect "a:\0Ab:\0A.dword b-a", ""()
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ret i32 0
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}
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; CHECK: Section {{.*}} .rela.debug_info {
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; CHECK-NOT: R_RISCV_ADD32
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; CHECK: }
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; CHECK: Section {{.*}} .rela.eh_frame {
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; CHECK-NEXT: 0x1C R_RISCV_32_PCREL .L0 0x0
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; CHECK-NEXT: }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "fixups-diff.ll", directory: "test/MC/RISCV")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang"}
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!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)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocation(line: 2, column: 3, scope: !7)
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