[PATCH] D27462: For functions with debug info, do not propagate the callsite debug location to inlined instructions.
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Wed Dec 7 02:47:37 PST 2016
This revision was automatically updated to reflect the committed changes.
Closed by commit rL288895: [InlineFunction] Do not propagate the callsite debug location to instructions… (authored by adibiagio).
Changed prior to commit:
https://reviews.llvm.org/D27462?vs=80416&id=80559#toc
Repository:
rL LLVM
https://reviews.llvm.org/D27462
Files:
llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp
llvm/trunk/test/DebugInfo/Generic/inline-debug-loc.ll
Index: llvm/trunk/test/DebugInfo/Generic/inline-debug-loc.ll
===================================================================
--- llvm/trunk/test/DebugInfo/Generic/inline-debug-loc.ll
+++ llvm/trunk/test/DebugInfo/Generic/inline-debug-loc.ll
@@ -0,0 +1,47 @@
+; RUN: opt -inline -S < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+; Function @bar contains instruction %cmp which is not associated to any debug
+; location. This test verifies that the inliner doesn't incorrectly attribute
+; the callsite debug location to %cmp.
+
+define i32 @bar(i32 %a, i32 %b) #0 !dbg !6 {
+entry:
+ %inc = add i32 %a, 1, !dbg !8
+ %cmp = icmp slt i32 %inc, %b
+ %select = select i1 %cmp, i32 %a, i32 %b, !dbg !8
+ ret i32 %select, !dbg !8
+}
+
+
+; CHECK-LABEL: define i32 @baz(
+; CHECK: entry:
+; CHECK: %[[INC:[a-z0-9.]+]] = add i32 %a, 1, !dbg ![[DL:[0-9]+]]
+; CHECK: %[[CMP:[a-z0-9.]+]] = icmp slt i32 %[[INC]], %b
+; CHECK-NOT: !dbg
+; CHECK: %[[SELECT:[a-z0-9.]+]] = select i1 %[[CMP]], i32 %a, i32 %b, !dbg ![[DL]]
+;
+; ![[DL]] = !DILocation(line: 3, scope: !{{.*}}, inlinedAt: {{.*}})
+
+define i32 @baz(i32 %a, i32 %b) !dbg !9 {
+entry:
+ %call = tail call i32 @bar(i32 %a, i32 %b), !dbg !10
+ ret i32 %call, !dbg !10
+}
+
+attributes #0 = { alwaysinline }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)
+!1 = !DIFile(filename: "test.c", directory: "")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!6 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
+!7 = !DISubroutineType(types: !2)
+!8 = !DILocation(line: 3, scope: !6)
+!9 = distinct !DISubprogram(name: "baz", scope: !1, file: !1, line: 11, type: !7, isLocal: false, isDefinition: true, scopeLine: 11, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
+!10 = !DILocation(line: 12, scope: !9)
Index: llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp
===================================================================
--- llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp
+++ llvm/trunk/lib/Transforms/Utils/InlineFunction.cpp
@@ -1350,7 +1350,7 @@
/// Update inlined instructions' line numbers to
/// to encode location where these instructions are inlined.
static void fixupLineNumbers(Function *Fn, Function::iterator FI,
- Instruction *TheCall) {
+ Instruction *TheCall, bool CalleeHasDebugInfo) {
const DebugLoc &TheCallDL = TheCall->getDebugLoc();
if (!TheCallDL)
return;
@@ -1374,6 +1374,8 @@
BI != BE; ++BI) {
DebugLoc DL = BI->getDebugLoc();
if (!DL) {
+ if (CalleeHasDebugInfo)
+ continue;
// If the inlined instruction has no line number, make it look as if it
// originates from the call location. This is important for
// ((__always_inline__, __nodebug__)) functions which must use caller
@@ -1643,8 +1645,11 @@
if (IFI.CG)
UpdateCallGraphAfterInlining(CS, FirstNewBlock, VMap, IFI);
- // Update inlined instructions' line number information.
- fixupLineNumbers(Caller, FirstNewBlock, TheCall);
+ // For 'nodebug' functions, the associated DISubprogram is always null.
+ // Conservatively avoid propagating the callsite debug location to
+ // instructions inlined from a function whose DISubprogram is not null.
+ fixupLineNumbers(Caller, FirstNewBlock, TheCall,
+ CalledFunc->getSubprogram() != nullptr);
// Clone existing noalias metadata if necessary.
CloneAliasScopeMetadata(CS, VMap);
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