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`clang -g -gpubnames` (with optional -gsplit-dwarf) creates the
`.debug_names` section ("per-CU" index). By default lld concatenates
input `.debug_names` sections into an output `.debug_names` section.
LLDB can consume the concatenated section but the lookup performance is
not good.
This patch adds --debug-names to create a per-module index by combining
the per-CU indexes into a single index that covers the entire load
module. The produced `.debug_names` is a replacement for `.gdb_index`.
Type units (-fdebug-types-section) are not handled yet.
Co-authored-by: Fangrui Song <i@maskray.me>
---------
Co-authored-by: Fangrui Song <i@maskray.me>
34 lines
1.2 KiB
ArmAsm
34 lines
1.2 KiB
ArmAsm
# REQUIRES: x86
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# RUN: rm -rf %t && mkdir %t && cd %t
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %S/Inputs/debug-names-a.s -o a.o
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# RUN: echo '.globl foo; foo:' | llvm-mc -filetype=obj -triple=x86_64 - -o b0.o
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# RUN: ld.lld --debug-names a.o b0.o -o out0
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# RUN: llvm-dwarfdump -debug-names out0 | FileCheck %s --check-prefix=DWARF
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# DWARF: .debug_names contents:
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# DWARF-NEXT: Name Index @ 0x0 {
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# DWARF-NEXT: Header {
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# DWARF-NEXT: Length: 0x6F
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# DWARF-NEXT: Format: DWARF32
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# DWARF-NEXT: Version: 5
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# DWARF-NEXT: CU count: 1
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# DWARF-NEXT: Local TU count: 0
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# DWARF-NEXT: Foreign TU count: 0
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# DWARF-NEXT: Bucket count: 2
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# DWARF-NEXT: Name count: 2
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# DWARF-NEXT: Abbreviations table size: 0x15
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# DWARF-NEXT: Augmentation: 'LLVM0700'
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# DWARF-NEXT: }
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# DWARF-NEXT: Compilation Unit offsets [
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# DWARF-NEXT: CU[0]: 0x00000000
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# DWARF-NEXT: ]
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## Test both files without .debug_names.
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# RUN: echo '.globl _start; _start:' | llvm-mc -filetype=obj -triple=x86_64 - -o a0.o
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# RUN: ld.lld --debug-names a0.o b0.o -o out1
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# RUN: llvm-readelf -SW out1 | FileCheck %s --check-prefix=ELF
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# ELF: Name Type Address Off Size ES Flg Lk Inf Al
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# ELF-NOT: .debug_names
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