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[llvm-locstats] Avoid the locstats when no scope bytes coverage found 

If the total number of PC range bytes in each variable's enclosing scope
('scope bytes total') is 0, we will have division by zero.

Differential Revision: https://reviews.llvm.org/D71415
This commit is contained in:
Djordje Todorovic 2019-12-12 14:31:50 +01:00
parent ed8dadb37c
commit baea913609
2 changed files with 43 additions and 0 deletions
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39
llvm/test/tools/llvm-locstats/no_scope_bytes.ll Normal file
View File

@ -0,0 +1,39 @@
; UNSUPPORTED: system-windows
; REQUIRES: x86-registered-target
; RUN: llc %s -o %t0.o -filetype=obj
; RUN: %llvm-locstats %t0.o | FileCheck %s --check-prefix=LOCSTATS
;
; LOCSTATS: No scope bytes found.
;
; This is based on the following reproducer:
;
; int fn() {
; return 0;
; }
;
; ModuleID = 'test.c'
source_filename = "test.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: norecurse nounwind readnone uwtable
define dso_local i32 @fn() local_unnamed_addr !dbg !7 {
entry:
ret i32 0, !dbg !11
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/")
!2 = !{}
!3 = !{i32 7, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 10.0.0"}
!7 = distinct !DISubprogram(name: "fn", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DILocation(line: 2, column: 3, scope: !7)

4
llvm/utils/llvm-locstats/llvm-locstats.py
View File

@ -29,6 +29,10 @@ def locstats_output(
variables_coverage_map
):
if scope_bytes == 0:
print ('No scope bytes found.')
sys.exit(0)
pc_ranges_covered = int(ceil(scope_bytes_covered * 100.0)
/ scope_bytes)
variables_coverage_per_map = {}