derek.holloway
7502bf64a4
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207 lines
9.1 KiB
LLVM
207 lines
9.1 KiB
LLVM
; In the LoongArch architecture, the .text section is subject to
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; relaxation, meaning the start address of each function can change
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; during the linking process. Therefore, the .debug_rnglists.dwo
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; section must obtain function's start addresses from the .debug_addr
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; section.
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; Generally, a function's body can be relaxed (for example, the
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; square() and main() functions in this test, which contain call
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; instructions). For such code ranges, the linker must place the
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; start and end addresses into the .debug_addr section and use
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; the DW_RLE_startx_endx entry form in the .debug_rnglists.dwo
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; section within the .dwo file.
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; However, some functions may not contain any relaxable instructions
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; (for example, the boo() function in this test). In these cases,
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; it is possible to use the more space-efficient DW_RLE_startx_length
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; range entry form.
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; RUN: rm -rf %t && split-file %s %t && cd %t
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; RUN: llc -dwarf-version=5 -split-dwarf-file=foo.dwo -O0 -mtriple=loongarch64-unknown-linux-gnu -filetype=obj relax_dwo_ranges.ll -o %t.o
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; RUN: llvm-dwarfdump -v %t.o | FileCheck --check-prefix=DWARF5 %s
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; RUN: llvm-dwarfdump --debug-info %t.o > /dev/null 2>&1 | count 0
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; RUN: llvm-objdump -h %t.o | FileCheck --check-prefix=HDR %s
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; RUN: llc -dwarf-version=4 -split-dwarf-file=foo.dwo -O0 -mtriple=loongarch64-unknown-linux-gnu -filetype=obj relax_dwo_ranges.ll -o %t.o
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; RUN: llvm-dwarfdump -v %t.o | FileCheck --check-prefix=DWARF4 %s
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; RUN: llvm-dwarfdump --debug-info %t.o > /dev/null 2>&1 | count 0
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; RUN: llvm-objdump -h %t.o | FileCheck --check-prefix=HDR %s
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; Make sure we don't produce any relocations in any .dwo section
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; HDR-NOT: .rela.{{.*}}.dwo
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; Ensure that 'square()' function uses indexed start and end addresses
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; DWARF5: .debug_info.dwo contents:
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; DWARF5: DW_TAG_subprogram
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; DWARF5-NEXT: DW_AT_low_pc [DW_FORM_addrx] (indexed (00000000) address = 0x0000000000000000 ".text")
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; DWARF5-NEXT: DW_AT_high_pc [DW_FORM_addrx] (indexed (00000001) address = 0x0000000000000040 ".text")
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; DWARF5: DW_AT_name {{.*}} "square")
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; DWARF5: DW_TAG_formal_parameter
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; HDR-NOT: .rela.{{.*}}.dwo
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; Ensure there is no unnecessary addresses in .o file
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; DWARF5: .debug_addr contents:
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; DWARF5: Addrs: [
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; DWARF5-NEXT: 0x0000000000000000
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; DWARF5-NEXT: 0x0000000000000040
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; DWARF5-NEXT: 0x0000000000000040
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; DWARF5-NEXT: 0x0000000000000080
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; DWARF5-NEXT: 0x00000000000000c4
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; DWARF5-NEXT: ]
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; HDR-NOT: .rela.{{.*}}.dwo
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; Ensure that 'boo()' and 'main()' use DW_RLE_startx_length and DW_RLE_startx_endx
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; entries respectively
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; DWARF5: .debug_rnglists.dwo contents:
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; DWARF5: ranges:
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; DWARF5-NEXT: 0x00000014: [DW_RLE_startx_length]: 0x0000000000000002, 0x0000000000000024 => [0x0000000000000040, 0x0000000000000064)
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; DWARF5-NEXT: 0x00000017: [DW_RLE_end_of_list ]
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; DWARF5-NEXT: 0x00000018: [DW_RLE_startx_endx ]: 0x0000000000000003, 0x0000000000000004 => [0x0000000000000080, 0x00000000000000c4)
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; DWARF5-NEXT: 0x0000001b: [DW_RLE_end_of_list ]
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; DWARF5-EMPTY:
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; HDR-NOT: .rela.{{.*}}.dwo
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; DWARF4: .debug_info.dwo contents:
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; DWARF4: DW_TAG_subprogram
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; DWARF4-NEXT: DW_AT_low_pc [DW_FORM_GNU_addr_index] (indexed (00000000) address = 0x0000000000000000 ".text")
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; DWARF4-NEXT: DW_AT_high_pc [DW_FORM_GNU_addr_index] (indexed (00000001) address = 0x0000000000000040 ".text")
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; DWARF4: DW_AT_name {{.*}} "square")
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; DWARF4: DW_TAG_subprogram
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; DWARF4-NEXT: DW_AT_low_pc [DW_FORM_GNU_addr_index] (indexed (00000002) address = 0x0000000000000040 ".text")
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; DWARF4-NEXT: DW_AT_high_pc [DW_FORM_data4] (0x00000024)
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; DWARF4: DW_AT_name {{.*}} "boo")
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; DWARF4: DW_TAG_subprogram
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; DWARF4-NEXT: DW_AT_low_pc [DW_FORM_GNU_addr_index] (indexed (00000003) address = 0x0000000000000080 ".text")
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; DWARF4-NEXT: DW_AT_high_pc [DW_FORM_GNU_addr_index] (indexed (00000004) address = 0x00000000000000c4 ".text")
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; DWARF4: DW_AT_name {{.*}} "main")
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; HDR-NOT: .rela.{{.*}}.dwo
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; Ensure there is no unnecessary addresses in .o file
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; DWARF4: .debug_addr contents:
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; DWARF4: Addrs: [
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; DWARF4-NEXT: 0x0000000000000000
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; DWARF4-NEXT: 0x0000000000000040
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; DWARF4-NEXT: 0x0000000000000040
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; DWARF4-NEXT: 0x0000000000000080
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; DWARF4-NEXT: 0x00000000000000c4
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; DWARF4-NEXT: ]
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; HDR-NOT: .rela.{{.*}}.dwo
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#--- relax_dwo_ranges.cpp
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__attribute__((noinline)) int boo();
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int square(int num) {
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int num1 = boo();
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return num1 * num;
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}
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__attribute__((noinline)) int boo() {
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return 8;
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}
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int main() {
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int a = 10;
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int squared = square(a);
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return squared;
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}
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#--- gen
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clang -g -S -emit-llvm -gsplit-dwarf --target=loongarch64 -march=loongarch64 -O0 relax_dwo_ranges.cpp -o -
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#--- relax_dwo_ranges.ll
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; ModuleID = 'relax_dwo_ranges.cpp'
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source_filename = "relax_dwo_ranges.cpp"
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target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
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target triple = "loongarch64"
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; Function Attrs: mustprogress noinline optnone
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define dso_local noundef signext i32 @_Z6squarei(i32 noundef signext %num) #0 !dbg !8 {
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entry:
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%num.addr = alloca i32, align 4
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%num1 = alloca i32, align 4
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store i32 %num, ptr %num.addr, align 4
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#dbg_declare(ptr %num.addr, !13, !DIExpression(), !14)
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#dbg_declare(ptr %num1, !15, !DIExpression(), !16)
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%call = call noundef signext i32 @_Z3boov(), !dbg !17
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store i32 %call, ptr %num1, align 4, !dbg !16
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%0 = load i32, ptr %num1, align 4, !dbg !18
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%1 = load i32, ptr %num.addr, align 4, !dbg !19
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%mul = mul nsw i32 %0, %1, !dbg !20
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ret i32 %mul, !dbg !21
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}
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; Function Attrs: mustprogress noinline nounwind optnone
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define dso_local noundef signext i32 @_Z3boov() #1 !dbg !22 {
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entry:
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ret i32 8, !dbg !25
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}
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; Function Attrs: mustprogress noinline norecurse optnone
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define dso_local noundef signext i32 @main() #2 !dbg !26 {
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entry:
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%retval = alloca i32, align 4
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%a = alloca i32, align 4
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%squared = alloca i32, align 4
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store i32 0, ptr %retval, align 4
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#dbg_declare(ptr %a, !27, !DIExpression(), !28)
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store i32 10, ptr %a, align 4, !dbg !28
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#dbg_declare(ptr %squared, !29, !DIExpression(), !30)
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%0 = load i32, ptr %a, align 4, !dbg !31
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%call = call noundef signext i32 @_Z6squarei(i32 noundef signext %0), !dbg !32
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store i32 %call, ptr %squared, align 4, !dbg !30
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%1 = load i32, ptr %squared, align 4, !dbg !33
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ret i32 %1, !dbg !34
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}
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attributes #0 = { mustprogress noinline optnone "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="loongarch64" "target-features"="+64bit,+d,+f,+relax,+ual" }
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attributes #1 = { mustprogress noinline nounwind optnone "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="loongarch64" "target-features"="+64bit,+d,+f,+relax,+ual" }
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attributes #2 = { mustprogress noinline norecurse optnone "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="loongarch64" "target-features"="+64bit,+d,+f,+relax,+ual" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, splitDebugFilename: "relax_dwo_ranges.dwo", emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: GNU)
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!1 = !DIFile(filename: "relax_dwo_ranges.cpp", directory: ".", checksumkind: CSK_MD5, checksum: "ecc4b1fa92df66be7da599933e4a21da")
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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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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"direct-access-external-data", i32 0}
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!6 = !{i32 7, !"frame-pointer", i32 2}
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!7 = !{!"clang"}
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!8 = distinct !DISubprogram(name: "square", linkageName: "_Z6squarei", scope: !1, file: !1, line: 3, type: !9, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !12)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11, !11}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !{}
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!13 = !DILocalVariable(name: "num", arg: 1, scope: !8, file: !1, line: 3, type: !11)
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!14 = !DILocation(line: 3, column: 16, scope: !8)
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!15 = !DILocalVariable(name: "num1", scope: !8, file: !1, line: 4, type: !11)
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!16 = !DILocation(line: 4, column: 7, scope: !8)
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!17 = !DILocation(line: 4, column: 14, scope: !8)
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!18 = !DILocation(line: 5, column: 10, scope: !8)
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!19 = !DILocation(line: 5, column: 17, scope: !8)
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!20 = !DILocation(line: 5, column: 15, scope: !8)
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!21 = !DILocation(line: 5, column: 3, scope: !8)
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!22 = distinct !DISubprogram(name: "boo", linkageName: "_Z3boov", scope: !1, file: !1, line: 8, type: !23, scopeLine: 8, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0)
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!23 = !DISubroutineType(types: !24)
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!24 = !{!11}
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!25 = !DILocation(line: 9, column: 3, scope: !22)
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!26 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 12, type: !23, scopeLine: 12, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !12)
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!27 = !DILocalVariable(name: "a", scope: !26, file: !1, line: 13, type: !11)
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!28 = !DILocation(line: 13, column: 7, scope: !26)
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!29 = !DILocalVariable(name: "squared", scope: !26, file: !1, line: 14, type: !11)
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!30 = !DILocation(line: 14, column: 7, scope: !26)
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!31 = !DILocation(line: 14, column: 24, scope: !26)
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!32 = !DILocation(line: 14, column: 17, scope: !26)
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!33 = !DILocation(line: 15, column: 10, scope: !26)
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!34 = !DILocation(line: 15, column: 3, scope: !26)
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