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[DebugInfo] Replace debug uses in replaceUsesOutsideBlock
Value::replaceUsesOutsideBlock doesn't replace debug uses which leads to an unnecessary reduction in variable location coverage. Fix this, add a unittest for it, and add a regression test demonstrating the change through instcombine's replacedSelectWithOperand. Reviewed By: djtodoro Differential Revision: https://reviews.llvm.org/D99169
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OCHyams
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94869b0900
commit
94edb782c9
@ -33,6 +33,7 @@
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Utils/Local.h"
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#include <algorithm>
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using namespace llvm;
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@ -531,6 +532,17 @@ void Value::replaceNonMetadataUsesWith(Value *New) {
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doRAUW(New, ReplaceMetadataUses::No);
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}
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/// Replace llvm.dbg.* uses of MetadataAsValue(ValueAsMetadata(V)) outside BB
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/// with New.
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static void replaceDbgUsesOutsideBlock(Value *V, Value *New, BasicBlock *BB) {
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SmallVector<DbgVariableIntrinsic *> DbgUsers;
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findDbgUsers(DbgUsers, V);
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for (auto *DVI : DbgUsers) {
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if (DVI->getParent() != BB)
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DVI->replaceVariableLocationOp(V, New);
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}
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}
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// Like replaceAllUsesWith except it does not handle constants or basic blocks.
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// This routine leaves uses within BB.
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void Value::replaceUsesOutsideBlock(Value *New, BasicBlock *BB) {
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@ -541,6 +553,7 @@ void Value::replaceUsesOutsideBlock(Value *New, BasicBlock *BB) {
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"replaceUses of value with new value of different type!");
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assert(BB && "Basic block that may contain a use of 'New' must be defined\n");
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replaceDbgUsesOutsideBlock(this, New, BB);
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replaceUsesWithIf(New, [BB](Use &U) {
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auto *I = dyn_cast<Instruction>(U.getUser());
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// Don't replace if it's an instruction in the BB basic block.
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@ -0,0 +1,127 @@
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; RUN: opt -instcombine -S %s | FileCheck %s
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;; Ensure that debug uses of a select are replaced when the select is replaced
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;; with one of its operands in InstCombine's replacedSelectWithOperand.
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;; Based on IR generated from this source, compiled with -O2 -g:
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;;
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;; extern void* glob;
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;; struct Thing {
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;; void *ptr;
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;; void *get() {return ptr;}
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;; };
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;; Thing *two(void *in) {
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;; if ((long)in & 1)
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;; return nullptr;
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;; return static_cast<Thing *>(in);
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;; }
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;; void one() {
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;; if (Thing *a = two(glob))
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;; // Without the fix we lose 'this' (a) in the inlined call below.
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;; glob = a->get();
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;; }
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;; Look at the instruction:
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;; %retval.0.i = select i1 %tobool.not.i, %struct.Thing* %2, %struct.Thing* null
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;; Note that %2 is a bitcast of %0.
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;; InstCombine replaces the use of %retval.0.i in if.then with %0 because
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;; if.then is only branched to when retval.0.is not null. Ensure that debug use
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;; of %retval.0.i is also replaced with %0.
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; CHECK: if.then:
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i8* %0, metadata ![[THIS:[0-9]+]], metadata !DIExpression())
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; CHECK: ![[THIS]] = !DILocalVariable(name: "this",
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.Thing = type { i8* }
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@glob = external dso_local local_unnamed_addr global i8*, align 8
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define dso_local void @_Z3onev() local_unnamed_addr !dbg !29 {
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entry:
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%0 = load i8*, i8** @glob, align 8, !dbg !35
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call void @llvm.dbg.value(metadata i8* %0, metadata !22, metadata !DIExpression()), !dbg !40
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%1 = ptrtoint i8* %0 to i64, !dbg !42
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%and.i = and i64 %1, 1, !dbg !43
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%tobool.not.i = icmp eq i64 %and.i, 0, !dbg !42
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%2 = bitcast i8* %0 to %struct.Thing*, !dbg !44
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%retval.0.i = select i1 %tobool.not.i, %struct.Thing* %2, %struct.Thing* null, !dbg !44
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call void @llvm.dbg.value(metadata %struct.Thing* %retval.0.i, metadata !33, metadata !DIExpression()), !dbg !45
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%tobool.not = icmp eq %struct.Thing* %retval.0.i, null, !dbg !46
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br i1 %tobool.not, label %if.end, label %if.then, !dbg !47
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if.then: ; preds = %entry
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call void @llvm.dbg.value(metadata %struct.Thing* %retval.0.i, metadata !48, metadata !DIExpression()), !dbg !51
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%ptr.i = getelementptr inbounds %struct.Thing, %struct.Thing* %retval.0.i, i64 0, i32 0, !dbg !53
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%3 = load i8*, i8** %ptr.i, align 8, !dbg !53
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store i8* %3, i8** @glob, align 8, !dbg !56
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br label %if.end, !dbg !57
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if.end: ; preds = %if.then, %entry
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ret void, !dbg !58
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !15, !16}
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!llvm.ident = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 13.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.cpp", directory: "/")
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!2 = !{}
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!3 = !{!4, !5}
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!4 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)
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!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Thing", file: !1, line: 2, size: 64, flags: DIFlagTypePassByValue, elements: !7, identifier: "_ZTS5Thing")
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!7 = !{!8, !10}
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "ptr", scope: !6, file: !1, line: 3, baseType: !9, size: 64)
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!10 = !DISubprogram(name: "get", linkageName: "_ZN5Thing3getEv", scope: !6, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
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!11 = !DISubroutineType(types: !12)
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!12 = !{!9, !13}
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
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!14 = !{i32 7, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{i32 1, !"wchar_size", i32 4}
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!17 = !{!"clang version 13.0.0"}
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!18 = distinct !DISubprogram(name: "two", linkageName: "_Z3twoPv", scope: !1, file: !1, line: 6, type: !19, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !21)
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!19 = !DISubroutineType(types: !20)
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!20 = !{!5, !9}
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!21 = !{!22}
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!22 = !DILocalVariable(name: "in", arg: 1, scope: !18, file: !1, line: 6, type: !9)
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!23 = !DILocation(line: 0, scope: !18)
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!24 = !DILocation(line: 7, column: 7, scope: !25)
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!25 = distinct !DILexicalBlock(scope: !18, file: !1, line: 7, column: 7)
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!26 = !DILocation(line: 7, column: 16, scope: !25)
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!27 = !DILocation(line: 7, column: 7, scope: !18)
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!28 = !DILocation(line: 10, column: 1, scope: !18)
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!29 = distinct !DISubprogram(name: "one", linkageName: "_Z3onev", scope: !1, file: !1, line: 11, type: !30, scopeLine: 11, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !32)
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!30 = !DISubroutineType(types: !31)
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!31 = !{null}
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!32 = !{!33}
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!33 = !DILocalVariable(name: "a", scope: !34, file: !1, line: 12, type: !5)
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!34 = distinct !DILexicalBlock(scope: !29, file: !1, line: 12, column: 14)
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!35 = !DILocation(line: 12, column: 22, scope: !34)
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!40 = !DILocation(line: 0, scope: !18, inlinedAt: !41)
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!41 = distinct !DILocation(line: 12, column: 18, scope: !34)
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!42 = !DILocation(line: 7, column: 7, scope: !25, inlinedAt: !41)
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!43 = !DILocation(line: 7, column: 16, scope: !25, inlinedAt: !41)
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!44 = !DILocation(line: 7, column: 7, scope: !18, inlinedAt: !41)
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!45 = !DILocation(line: 0, scope: !34)
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!46 = !DILocation(line: 12, column: 14, scope: !34)
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!47 = !DILocation(line: 12, column: 14, scope: !29)
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!48 = !DILocalVariable(name: "this", arg: 1, scope: !49, type: !5, flags: DIFlagArtificial | DIFlagObjectPointer)
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!49 = distinct !DISubprogram(name: "get", linkageName: "_ZN5Thing3getEv", scope: !6, file: !1, line: 4, type: !11, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !10, retainedNodes: !50)
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!50 = !{!48}
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!51 = !DILocation(line: 0, scope: !49, inlinedAt: !52)
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!52 = distinct !DILocation(line: 14, column: 15, scope: !34)
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!53 = !DILocation(line: 4, column: 23, scope: !49, inlinedAt: !52)
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!56 = !DILocation(line: 14, column: 10, scope: !34)
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!57 = !DILocation(line: 14, column: 5, scope: !34)
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!58 = !DILocation(line: 15, column: 1, scope: !29)
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!59 = !DILocation(line: 0, scope: !49)
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!60 = !DILocation(line: 4, column: 23, scope: !49)
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!61 = !DILocation(line: 4, column: 16, scope: !49)
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@ -9,6 +9,7 @@
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#include "llvm/IR/Value.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/ModuleSlotTracker.h"
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@ -247,4 +248,68 @@ TEST(ValueTest, getLocalSlotDeath) {
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}
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#endif
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TEST(ValueTest, replaceUsesOutsideBlock) {
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// Check that Value::replaceUsesOutsideBlock(New, BB) replaces uses outside
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// BB, including dbg.* uses of MetadataAsValue(ValueAsMetadata(this)).
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const auto *IR = R"(
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define i32 @f() !dbg !6 {
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entry:
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%a = add i32 0, 1, !dbg !15
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%b = add i32 0, 2, !dbg !15
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%c = add i32 %a, 2, !dbg !15
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call void @llvm.dbg.value(metadata i32 %a, metadata !9, metadata !DIExpression()), !dbg !15
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br label %exit, !dbg !15
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exit:
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call void @llvm.dbg.value(metadata i32 %a, metadata !11, metadata !DIExpression()), !dbg !16
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ret i32 %a, !dbg !16
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C, file: !1, producer: "debugify", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.ll", directory: "/")
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!2 = !{}
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!5 = !{i32 2, !"Debug Info Version", i32 3}
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!6 = distinct !DISubprogram(name: "f", linkageName: "f", scope: null, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !8)
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!7 = !DISubroutineType(types: !2)
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!8 = !{!9, !11}
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!9 = !DILocalVariable(name: "1", scope: !6, file: !1, line: 1, type: !10)
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!10 = !DIBasicType(name: "ty32", size: 32, encoding: DW_ATE_signed)
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!11 = !DILocalVariable(name: "2", scope: !6, file: !1, line: 2, type: !12)
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!12 = !DIBasicType(name: "ty64", size: 64, encoding: DW_ATE_signed)
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!15 = !DILocation(line: 1, column: 1, scope: !6)
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!16 = !DILocation(line: 5, column: 1, scope: !6)
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)";
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LLVMContext Ctx;
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SMDiagnostic Err;
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std::unique_ptr<Module> M = parseAssemblyString(IR, Err, Ctx);
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if (!M)
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Err.print("ValueTest", errs());
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auto GetNext = [](auto *I) { return &*++I->getIterator(); };
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Function *F = M->getFunction("f");
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// Entry.
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BasicBlock *Entry = &F->front();
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Instruction *A = &Entry->front();
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Instruction *B = GetNext(A);
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Instruction *C = GetNext(B);
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auto *EntryDbg = cast<DbgValueInst>(GetNext(C));
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// Exit.
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BasicBlock *Exit = GetNext(Entry);
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auto *ExitDbg = cast<DbgValueInst>(&Exit->front());
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Instruction *Ret = GetNext(ExitDbg);
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A->replaceUsesOutsideBlock(B, Entry);
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// These users are in Entry so shouldn't be changed.
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ASSERT_TRUE(C->getOperand(0) == cast<Value>(A));
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ASSERT_TRUE(EntryDbg->getValue(0) == cast<Value>(A));
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// These users are outside Entry so should be changed.
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ASSERT_TRUE(ExitDbg->getValue(0) == cast<Value>(B));
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ASSERT_TRUE(Ret->getOperand(0) == cast<Value>(B));
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}
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} // end anonymous namespace
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