shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions 6 Packages Projects Releases Wiki Activity
llvm-project/llvm/test/DebugInfo/X86/basic-block-sections_1.ll
Sriraman Tallam d1a838babc Basic block sections should enable function sections implicitly. 
Basic block sections enables function sections implicitly, this is not needed
and is inefficient with "=list" option.

We had basic block sections enable function sections implicitly in clang. This
is particularly inefficient with "=list" option as it places functions that do
not have any basic block sections in separate sections. This causes unnecessary
object file overhead for large applications.

This patch disables this implicit behavior. It only creates function sections
for those functions that require basic block sections.

Further, there was an inconistent behavior with llc as llc was not turning on
function sections by default. This patch makes llc and clang consistent and
tests are added to check the new behavior.

This is the first of two patches and this adds functionality in LLVM to
create a new section for the entry block if function sections is not
enabled.

Differential Revision: https://reviews.llvm.org/D93876
2021-02-16 16:27:16 -08:00

106 lines
5.2 KiB
LLVM
Raw Blame History

; RUN: llc -O0 %s -mtriple=x86_64 -filetype=obj -o %t && llvm-dwarfdump -debug-info -v %t | FileCheck --check-prefix=NO-SECTIONS %s
; RUN: llc -O0 %s --basic-block-sections=all --unique-basic-block-section-names -mtriple=x86_64 -filetype=obj -o %t && llvm-dwarfdump -debug-info -v %t | FileCheck --check-prefix=BB-SECTIONS %s
; RUN: llc -O0 %s --basic-block-sections=all --unique-basic-block-section-names -mtriple=x86_64 -filetype=obj -split-dwarf-file=%t.dwo -o %t && llvm-dwarfdump -debug-info -v %t | FileCheck --check-prefix=BB-SECTIONS %s
; RUN: llc -O0 %s --basic-block-sections=all -mtriple=x86_64 -o - | FileCheck --check-prefix=BB-SECTIONS-ASM %s
; RUN: llc -O0 %s -mtriple=x86_64 -filetype=obj -o %t && llvm-dwarfdump -debug-line %t | FileCheck --check-prefix=BB-SECTIONS-LINE-TABLE %s
; From:
; 1 int foo(int a) {
; 2 if (a > 20)
; 3 return 2;
; 4 else
; 5 return 0;
; 6 }
; NO-SECTIONS: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000 ".text")
; NO-SECTIONS: DW_AT_high_pc [DW_FORM_data4] ({{.*}})
; BB-SECTIONS: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; BB-SECTIONS-NEXT: DW_AT_ranges [DW_FORM_sec_offset]
; BB-SECTIONS-NEXT: [{{.*}}) ".text._Z3fooi._Z3fooi.__part.1"
; BB-SECTIONS-NEXT: [{{.*}}) ".text._Z3fooi._Z3fooi.__part.2"
; BB-SECTIONS-NEXT: [{{.*}}) ".text._Z3fooi._Z3fooi.__part.3"
; BB-SECTIONS-NEXT: [{{.*}}) ".text._Z3fooi"
; BB-SECTIONS-ASM: _Z3fooi:
; BB-SECTIONS-ASM: .Ltmp{{[0-9]+}}:
; BB-SECTIONS-ASM-NEXT: .loc 1 2 9 prologue_end
; BB-SECTIONS-ASM: .Ltmp{{[0-9]+}}:
; BB-SECTIONS-ASM-NEXT: .loc 1 2 7 is_stmt
; BB-SECTIONS-ASM: _Z3fooi.__part.1:
; BB-SECTIONS-ASM: .LBB_END0_{{[0-9]+}}:
; BB-SECTIONS-ASM: .size _Z3fooi.__part.1, .LBB_END0_{{[0-9]+}}-_Z3fooi.__part.1
; BB-SECTIONS-ASM: _Z3fooi.__part.2:
; BB-SECTIONS-ASM: .Ltmp{{[0-9]+}}:
; BB-SECTIONS-ASM-NEXT: .LBB_END0_{{[0-9]+}}:
; BB-SECTIONS-ASM: .size _Z3fooi.__part.2, .LBB_END0_{{[0-9]+}}-_Z3fooi.__part.2
; BB-SECTIONS-ASM: _Z3fooi.__part.3:
; BB-SECTIONS-ASM: .Ltmp{{[0-9]+}}:
; BB-SECTIONS-ASM-NEXT: .LBB_END0_{{[0-9]+}}:
; BB-SECTIONS-ASM: .size _Z3fooi.__part.3, .LBB_END0_{{[0-9]+}}-_Z3fooi.__part.3
; BB-SECTIONS-ASM: .Lfunc_end0:
; BB-SECTIONS-ASM: .Ldebug_ranges0:
; BB-SECTIONS-ASM-NEXT: .quad _Z3fooi.__part.1
; BB-SECTIONS-ASM-NEXT: .quad .LBB_END0_{{[0-9]+}}
; BB-SECTIONS-ASM-NEXT: .quad _Z3fooi.__part.2
; BB-SECTIONS-ASM-NEXT: .quad .LBB_END0_{{[0-9]+}}
; BB-SECTIONS-ASM-NEXT: .quad _Z3fooi.__part.3
; BB-SECTIONS-ASM-NEXT: .quad .LBB_END0_{{[0-9]+}}
; BB-SECTIONS-ASM-NEXT: .quad .Lfunc_begin0
; BB-SECTIONS-ASM-NEXT: .quad .Lfunc_end0
; BB-SECTIONS-ASM-NEXT: .quad 0
; BB-SECTIONS-ASM-NEXT: .quad 0
; BB-SECTIONS-LINE-TABLE: 0x0000000000000000 1 0 1 0 0 is_stmt
; BB-SECTIONS-LINE-TABLE-NEXT: 0x0000000000000004 2 9 1 0 0 is_stmt prologue_end
; BB-SECTIONS-LINE-TABLE-NEXT: 0x0000000000000009 2 7 1 0 0
; BB-SECTIONS-LINE-TABLE-NEXT: 0x000000000000000b 3 5 1 0 0 is_stmt
; BB-SECTIONS-LINE-TABLE-NEXT: 0x0000000000000015 5 5 1 0 0 is_stmt
; BB-SECTIONS-LINE-TABLE-NEXT: 0x000000000000001d 6 1 1 0 0 is_stmt
; BB-SECTIONS-LINE-TABLE-NEXT: 0x0000000000000022 6 1 1 0 0 is_stmt end_sequence
; Function Attrs: noinline nounwind optnone uwtable
define dso_local i32 @_Z3fooi(i32 %0) !dbg !7 {
%2 = alloca i32, align 4
%3 = alloca i32, align 4
store i32 %0, i32* %3, align 4
call void @llvm.dbg.declare(metadata i32* %3, metadata !11, metadata !DIExpression()), !dbg !12
%4 = load i32, i32* %3, align 4, !dbg !13
%5 = icmp sgt i32 %4, 20, !dbg !15
br i1 %5, label %6, label %7, !dbg !16
6: ; preds = %1
store i32 2, i32* %2, align 4, !dbg !17
br label %8, !dbg !17
7: ; preds = %1
store i32 0, i32* %2, align 4, !dbg !18
br label %8, !dbg !18
8: ; preds = %7, %6
%9 = load i32, i32* %2, align 4, !dbg !19
ret i32 %9, !dbg !19
}
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 10.0.0 (git@github.com:google/llvm-propeller.git f9421ebf4b3d8b64678bf6c49d1607fdce3f50c5)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "debuginfo.cc", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!7 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 1, type: !10)
!12 = !DILocation(line: 1, column: 13, scope: !7)
!13 = !DILocation(line: 2, column: 7, scope: !14)
!14 = distinct !DILexicalBlock(scope: !7, file: !1, line: 2, column: 7)
!15 = !DILocation(line: 2, column: 9, scope: !14)
!16 = !DILocation(line: 2, column: 7, scope: !7)
!17 = !DILocation(line: 3, column: 5, scope: !14)
!18 = !DILocation(line: 5, column: 5, scope: !14)
!19 = !DILocation(line: 6, column: 1, scope: !7)
Reference in New Issue View Git Blame Copy Permalink