140e1894f2
Patch 1/4 adding bitcode support. Store whether or not a function is using Key Instructions in its DISubprogram so that we don't need to rely on the -mllvm flag -dwarf-use-key-instructions to determine whether or not to interpret Key Instructions metadata to decide is_stmt placement at DWARF emission time. This makes bitcode support simple and enables well defined mixing of non-key-instructions and key-instructions functions in an LTO context. This patch adds the bit (using DISubprogram::SubclassData1). PR 144104 and 144103 use it during DWARF emission. PR 44102 adds bitcode support. See pull request for overview of alternative attempts.
70 lines
3.1 KiB
LLVM
70 lines
3.1 KiB
LLVM
; RUN: llc %s --filetype=obj -o - --dwarf-use-key-instructions \
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; RUN: | llvm-objdump -d - --no-show-raw-insn \
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; RUN: | FileCheck %s --check-prefix=OBJ
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; RUN: llc %s --filetype=obj -o - --dwarf-use-key-instructions \
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; RUN: | llvm-dwarfdump - --debug-line \
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; RUN: | FileCheck %s --check-prefix=DBG
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;; 1. [[gnu::nodebug]] void prologue_end();
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;; 2.
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;; 3. int f(int *a, int b, int c) {
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;; 4. prologue_end();
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;; 5. *a =
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;; 6. b + c;
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;; 7. return *a;
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;; 8. }
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;;
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;; The add and store are in the same group (1). The add (line 6) has lower
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;; precedence (rank 2) so should not get is_stmt applied.
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; OBJ: 0000000000000000 <_Z1fPiii>:
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; OBJ-NEXT: 0: pushq %rbp
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; OBJ-NEXT: 1: pushq %r14
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; OBJ-NEXT: 3: pushq %rbx
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; OBJ-NEXT: 4: movl %edx, %ebx
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; OBJ-NEXT: 6: movl %esi, %ebp
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; OBJ-NEXT: 8: movq %rdi, %r14
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; OBJ-NEXT: b: callq 0x10 <_Z1fPiii+0x10>
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; OBJ-NEXT: 10: addl %ebx, %ebp
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; OBJ-NEXT: 12: movl %ebp, (%r14)
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; OBJ-NEXT: 15: movl %ebp, %eax
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; OBJ-NEXT: 17: popq %rbx
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; OBJ-NEXT: 18: popq %r14
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; OBJ-NEXT: 1a: popq %rbp
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; DBG: Address Line Column File ISA Discriminator OpIndex Flags
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; DBG-NEXT: ------------------ ------ ------ ------ --- ------------- ------- -------------
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; DBG-NEXT: 0x0000000000000000 3 0 0 0 0 0 is_stmt
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; DBG-NEXT: 0x000000000000000b 4 0 0 0 0 0 is_stmt prologue_end
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; DBG-NEXT: 0x0000000000000010 6 0 0 0 0 0
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; DBG-NEXT: 0x0000000000000012 5 0 0 0 0 0 is_stmt
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; DBG-NEXT: 0x0000000000000015 7 0 0 0 0 0 is_stmt
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; DBG-NEXT: 0x0000000000000017 7 0 0 0 0 0 epilogue_begin
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; DBG-NEXT: 0x000000000000001c 7 0 0 0 0 0 end_sequence
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target triple = "x86_64-unknown-linux-gnu"
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define hidden noundef i32 @_Z1fPiii(ptr %a, i32 %b, i32 %c) local_unnamed_addr !dbg !11 {
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entry:
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tail call void @_Z12prologue_endv(), !dbg !DILocation(line: 4, scope: !11)
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%add = add nsw i32 %c, %b, !dbg !DILocation(line: 6, scope: !11, atomGroup: 1, atomRank: 2)
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store i32 %add, ptr %a, align 4, !dbg !DILocation(line: 5, scope: !11, atomGroup: 1, atomRank: 1)
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ret i32 %add, !dbg !DILocation(line: 7, scope: !11, atomGroup: 2, atomRank: 1)
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}
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declare void @_Z12prologue_endv() local_unnamed_addr #1
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_17, file: !1, producer: "clang version 19.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.cpp", directory: "/")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 19.0.0"}
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!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !12, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, keyInstructions: true)
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!12 = !DISubroutineType(types: !13)
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!13 = !{}
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