llvm-6502/test/Instrumentation/SanitizerCoverage/coverage2-dbg.ll

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; Test that coverage instrumentation does not lose debug location.
; RUN: opt < %s -sancov -sanitizer-coverage-level=2 -S | FileCheck %s
; C++ source:
; 1: void foo(int *a) {
; 2: if (a)
; 3: *a = 0;
; 4: }
; clang++ if.cc -O3 -g -S -emit-llvm
; and add sanitize_address to @_Z3fooPi
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Check that __sanitizer_cov call has !dgb pointing to the beginning
; of appropriate basic blocks.
; CHECK-LABEL:_Z3fooPi
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[A:!.*]]
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[B:!.*]]
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[C:!.*]]
; CHECK: ret void
; CHECK: [[A]] = metadata !{i32 1, i32 0, metadata !{{.*}}, null}
; CHECK: [[B]] = metadata !{i32 3, i32 5, metadata !{{.*}}, null}
; CHECK: [[C]] = metadata !{i32 4, i32 1, metadata !{{.*}}, null}
define void @_Z3fooPi(i32* %a) #0 {
entry:
tail call void @llvm.dbg.value(metadata !{i32* %a}, i64 0, metadata !11, metadata !{metadata !"0x102"}), !dbg !15
%tobool = icmp eq i32* %a, null, !dbg !16
br i1 %tobool, label %if.end, label %if.then, !dbg !16
if.then: ; preds = %entry
store i32 0, i32* %a, align 4, !dbg !18, !tbaa !19
br label %if.end, !dbg !18
if.end: ; preds = %entry, %if.then
ret void, !dbg !23
}
; Function Attrs: nounwind readnone
Move the complex address expression out of DIVariable and into an extra argument of the llvm.dbg.declare/llvm.dbg.value intrinsics. Previously, DIVariable was a variable-length field that has an optional reference to a Metadata array consisting of a variable number of complex address expressions. In the case of OpPiece expressions this is wasting a lot of storage in IR, because when an aggregate type is, e.g., SROA'd into all of its n individual members, the IR will contain n copies of the DIVariable, all alike, only differing in the complex address reference at the end. By making the complex address into an extra argument of the dbg.value/dbg.declare intrinsics, all of the pieces can reference the same variable and the complex address expressions can be uniqued across the CU, too. Down the road, this will allow us to move other flags, such as "indirection" out of the DIVariable, too. The new intrinsics look like this: declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr) declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr) This patch adds a new LLVM-local tag to DIExpressions, so we can detect and pretty-print DIExpression metadata nodes. What this patch doesn't do: This patch does not touch the "Indirect" field in DIVariable; but moving that into the expression would be a natural next step. http://reviews.llvm.org/D4919 rdar://problem/17994491 Thanks to dblaikie and dexonsmith for reviewing this patch! Note: I accidentally committed a bogus older version of this patch previously. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-01 18:55:02 +00:00
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" sanitize_address}
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!12, !13}
!llvm.ident = !{!14}
!0 = metadata !{metadata !"0x11\004\00clang version 3.6.0 (217079)\001\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [FOO/if.cc] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"if.cc", metadata !"FOO"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{metadata !"0x2e\00foo\00foo\00_Z3fooPi\001\000\001\000\006\00256\001\001", metadata !1, metadata !5, metadata !6, null, void (i32*)* @_Z3fooPi, null, null, metadata !10} ; [ DW_TAG_subprogram ] [line 1] [def] [foo]
!5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [FOO/if.cc]
!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = metadata !{null, metadata !8}
!8 = metadata !{metadata !"0xf\00\000\0064\0064\000\000", null, null, metadata !9} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from int]
!9 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!10 = metadata !{metadata !11}
!11 = metadata !{metadata !"0x101\00a\0016777217\000", metadata !4, metadata !5, metadata !8} ; [ DW_TAG_arg_variable ] [a] [line 1]
!12 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!13 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
!14 = metadata !{metadata !"clang version 3.6.0 (217079)"}
!15 = metadata !{i32 1, i32 15, metadata !4, null}
!16 = metadata !{i32 2, i32 7, metadata !17, null}
!17 = metadata !{metadata !"0xb\002\007\000", metadata !1, metadata !4} ; [ DW_TAG_lexical_block ] [FOO/if.cc]
!18 = metadata !{i32 3, i32 5, metadata !17, null}
!19 = metadata !{metadata !20, metadata !20, i64 0}
!20 = metadata !{metadata !"int", metadata !21, i64 0}
!21 = metadata !{metadata !"omnipotent char", metadata !22, i64 0}
!22 = metadata !{metadata !"Simple C/C++ TBAA"}
!23 = metadata !{i32 4, i32 1, metadata !4, null}