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llvm-mirror/test/DebugInfo/X86/dbg-value-transfer-order.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

150 lines
6.9 KiB
LLVM
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; RUN: llc < %s | FileCheck %s
; Reduced manually from C source:
; unsigned __attribute__((noinline, optnone)) useslot(unsigned v) { return v; }
; void __attribute__((noinline)) f(unsigned cell_offset, unsigned *page_start_) {
; unsigned cell = page_start_[0];
; while (cell) {
; unsigned bit_offset = cell_offset ? __builtin_ctz(cell) : 32;
; unsigned bit_mask = 1U << bit_offset;
; unsigned slot = (cell_offset + bit_offset) << /*log2(sizeof(void*))*/ 3;
; cell ^= bit_mask + page_start_[slot];
; }
; }
; int main() {
; static unsigned pages[32] = {1, 2, 3, 4, 5, 6, 7};
; f(3, &pages[0]);
; }
; We had a bug where the DBG_VALUE instruction for bit_offset would be emitted
; at the end of the basic block, long after its actual program point. What's
; interesting in this example is that the !range metadata produces an AssertSext
; DAG node that gets replaced during ISel. This leads to an unordered SDDbgValue
; vector, which has to be sorted by IR order before it is processed in parallel
; with the Orders insertion point vector.
; CHECK-LABEL: f: # @f
; CHECK: .LBB0_2: # %while.body
; CHECK: movl $32, %ecx
; CHECK: testl {{.*}}
; CHECK: jne .LBB0_4
; CHECK: # %bb.3: # %if.then
; CHECK: callq if_then
; CHECK: movl %eax, %ecx
; CHECK: .LBB0_4: # %if.end
; Check that this DEBUG_VALUE comes before the left shift.
; CHECK: #DEBUG_VALUE: bit_offset <- $ecx
; CHECK: .cv_loc 0 1 8 28 # t.c:8:28
; CHECK: movl $1, %[[reg:[^ ]*]]
; CHECK: shll %cl, %[[reg]]
; ModuleID = 't.c'
source_filename = "t.c"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.24215"
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare i32 @if_then()
; Function Attrs: noinline nounwind readonly uwtable
define void @f(i32 %cell_offset, i32* nocapture %page_start_) local_unnamed_addr #0 !dbg !31 {
entry:
%0 = load i32, i32* %page_start_, align 4, !dbg !45
%tobool14 = icmp eq i32 %0, 0, !dbg !47
br i1 %tobool14, label %while.end, label %while.body, !dbg !47
while.body: ; preds = %while.body.lr.ph, %while.body
%cell.015 = phi i32 [ %0, %entry ], [ %xor, %if.end ]
%tobool1 = icmp eq i32 %cell_offset, 0
br i1 %tobool1, label %if.then, label %if.end
if.then:
%1 = call i32 @if_then(), !dbg !48, !range !49
br label %if.end
if.end:
%cond = phi i32 [ %1, %if.then ], [ 32, %while.body ]
tail call void @llvm.dbg.value(metadata i32 %cond, metadata !39, metadata !DIExpression()), !dbg !51
%shl = shl i32 1, %cond, !dbg !52
%add = add i32 %cond, %cell_offset, !dbg !54
%shl2 = shl i32 %add, 3, !dbg !55
%idxprom = zext i32 %shl2 to i64, !dbg !57
%arrayidx3 = getelementptr inbounds i32, i32* %page_start_, i64 %idxprom, !dbg !57
%2 = load i32, i32* %arrayidx3, align 4, !dbg !57
%add4 = add i32 %2, %shl, !dbg !58
%xor = xor i32 %add4, %cell.015, !dbg !59
tail call void @llvm.dbg.value(metadata i32 %xor, metadata !38, metadata !DIExpression()), !dbg !46
%tobool = icmp eq i32 %xor, 0, !dbg !47
br i1 %tobool, label %while.end, label %while.body, !dbg !47, !llvm.loop !60
while.end: ; preds = %while.body, %entry
ret void, !dbg !62
}
; Function Attrs: nounwind readnone speculatable
declare i32 @llvm.cttz.i32(i32, i1) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { noinline nounwind readonly uwtable }
attributes #1 = { nounwind readnone speculatable }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!14, !15, !16, !17}
!llvm.ident = !{!18}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "f80d0003faf76554dfdec6c95da285cc")
!2 = !{}
!3 = !{!4}
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = distinct !DIGlobalVariable(name: "pages", scope: !6, file: !1, line: 18, type: !10, isLocal: true, isDefinition: true)
!6 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 17, type: !7, isLocal: false, isDefinition: true, scopeLine: 17, isOptimized: true, unit: !0, retainedNodes: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{!9}
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !DICompositeType(tag: DW_TAG_array_type, baseType: !11, size: 1024, elements: !12)
!11 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
!12 = !{!13}
!13 = !DISubrange(count: 32)
!14 = !{i32 2, !"CodeView", i32 1}
!15 = !{i32 2, !"Debug Info Version", i32 3}
!16 = !{i32 1, !"wchar_size", i32 2}
!17 = !{i32 7, !"PIC Level", i32 2}
!18 = !{!"clang version 6.0.0 "}
!31 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 4, type: !32, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !35)
!32 = !DISubroutineType(types: !33)
!33 = !{null, !11, !34}
!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64)
!35 = !{!36, !37, !38, !39, !41, !42}
!36 = !DILocalVariable(name: "page_start_", arg: 2, scope: !31, file: !1, line: 4, type: !34)
!37 = !DILocalVariable(name: "cell_offset", arg: 1, scope: !31, file: !1, line: 4, type: !11)
!38 = !DILocalVariable(name: "cell", scope: !31, file: !1, line: 5, type: !11)
!39 = !DILocalVariable(name: "bit_offset", scope: !40, file: !1, line: 7, type: !11)
!40 = distinct !DILexicalBlock(scope: !31, file: !1, line: 6, column: 16)
!41 = !DILocalVariable(name: "bit_mask", scope: !40, file: !1, line: 8, type: !11)
!42 = !DILocalVariable(name: "slot", scope: !40, file: !1, line: 9, type: !11)
!43 = !DILocation(line: 4, column: 66, scope: !31)
!44 = !DILocation(line: 4, column: 43, scope: !31)
!45 = !DILocation(line: 5, column: 19, scope: !31)
!46 = !DILocation(line: 5, column: 12, scope: !31)
!47 = !DILocation(line: 6, column: 3, scope: !31)
!48 = !DILocation(line: 7, column: 41, scope: !40)
!49 = !{i32 0, i32 33}
!50 = !DILocation(line: 7, column: 27, scope: !40)
!51 = !DILocation(line: 7, column: 14, scope: !40)
!52 = !DILocation(line: 8, column: 28, scope: !40)
!53 = !DILocation(line: 8, column: 14, scope: !40)
!54 = !DILocation(line: 9, column: 34, scope: !40)
!55 = !DILocation(line: 9, column: 48, scope: !40)
!56 = !DILocation(line: 9, column: 14, scope: !40)
!57 = !DILocation(line: 13, column: 24, scope: !40)
!58 = !DILocation(line: 13, column: 22, scope: !40)
!59 = !DILocation(line: 13, column: 10, scope: !40)
!60 = distinct !{!60, !47, !61}
!61 = !DILocation(line: 14, column: 3, scope: !31)
!62 = !DILocation(line: 15, column: 1, scope: !31)
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