[llvm] r312196 - Don't add a fragment expression when GlobalSRA splits up a single-member struct
Adrian Prantl via llvm-commits
llvm-commits at lists.llvm.org
Wed Aug 30 17:06:18 PDT 2017
Author: adrian
Date: Wed Aug 30 17:06:18 2017
New Revision: 312196
URL: http://llvm.org/viewvc/llvm-project?rev=312196&view=rev
Log:
Don't add a fragment expression when GlobalSRA splits up a single-member struct
Fixes PR34390.
https://bugs.llvm.org/show_bug.cgi?id=34390
Added:
llvm/trunk/test/DebugInfo/Generic/global-sra-single-member.ll
Modified:
llvm/trunk/lib/Transforms/IPO/GlobalOpt.cpp
Modified: llvm/trunk/lib/Transforms/IPO/GlobalOpt.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/GlobalOpt.cpp?rev=312196&r1=312195&r2=312196&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/IPO/GlobalOpt.cpp (original)
+++ llvm/trunk/lib/Transforms/IPO/GlobalOpt.cpp Wed Aug 30 17:06:18 2017
@@ -420,15 +420,17 @@ static bool GlobalUsersSafeToSRA(GlobalV
/// Copy over the debug info for a variable to its SRA replacements.
static void transferSRADebugInfo(GlobalVariable *GV, GlobalVariable *NGV,
uint64_t FragmentOffsetInBits,
- uint64_t FragmentSizeInBits) {
+ uint64_t FragmentSizeInBits,
+ unsigned NumElements) {
SmallVector<DIGlobalVariableExpression *, 1> GVs;
GV->getDebugInfo(GVs);
for (auto *GVE : GVs) {
DIVariable *Var = GVE->getVariable();
DIExpression *Expr = GVE->getExpression();
- auto *NExpr = DIExpression::createFragmentExpression(
- Expr, FragmentOffsetInBits, FragmentSizeInBits);
- auto *NGVE = DIGlobalVariableExpression::get(GVE->getContext(), Var, NExpr);
+ if (NumElements > 1)
+ Expr = DIExpression::createFragmentExpression(Expr, FragmentOffsetInBits,
+ FragmentSizeInBits);
+ auto *NGVE = DIGlobalVariableExpression::get(GVE->getContext(), Var, Expr);
NGV->addDebugInfo(NGVE);
}
}
@@ -458,9 +460,10 @@ static GlobalVariable *SRAGlobal(GlobalV
if (StructType *STy = dyn_cast<StructType>(Ty)) {
uint64_t FragmentOffset = 0;
- NewGlobals.reserve(STy->getNumElements());
+ unsigned NumElements = STy->getNumElements();
+ NewGlobals.reserve(NumElements);
const StructLayout &Layout = *DL.getStructLayout(STy);
- for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
+ for (unsigned i = 0, e = NumElements; i != e; ++i) {
Constant *In = Init->getAggregateElement(i);
assert(In && "Couldn't get element of initializer?");
GlobalVariable *NGV = new GlobalVariable(STy->getElementType(i), false,
@@ -484,7 +487,7 @@ static GlobalVariable *SRAGlobal(GlobalV
// Copy over the debug info for the variable.
FragmentOffset = alignTo(FragmentOffset, NewAlign);
uint64_t Size = DL.getTypeSizeInBits(NGV->getValueType());
- transferSRADebugInfo(GV, NGV, FragmentOffset, Size);
+ transferSRADebugInfo(GV, NGV, FragmentOffset, Size, NumElements);
FragmentOffset += Size;
}
} else if (SequentialType *STy = dyn_cast<SequentialType>(Ty)) {
@@ -516,8 +519,8 @@ static GlobalVariable *SRAGlobal(GlobalV
unsigned NewAlign = (unsigned)MinAlign(StartAlignment, EltSize*i);
if (NewAlign > EltAlign)
NGV->setAlignment(NewAlign);
-
- transferSRADebugInfo(GV, NGV, FragmentSizeInBits * i, FragmentSizeInBits);
+ transferSRADebugInfo(GV, NGV, FragmentSizeInBits * i, FragmentSizeInBits,
+ NumElements);
}
}
Added: llvm/trunk/test/DebugInfo/Generic/global-sra-single-member.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/DebugInfo/Generic/global-sra-single-member.ll?rev=312196&view=auto
==============================================================================
--- llvm/trunk/test/DebugInfo/Generic/global-sra-single-member.ll (added)
+++ llvm/trunk/test/DebugInfo/Generic/global-sra-single-member.ll Wed Aug 30 17:06:18 2017
@@ -0,0 +1,53 @@
+; RUN: opt -S -globalopt < %s | FileCheck %s
+; struct {
+; int f0;
+; } static a;
+; int main() {
+; a.f0++;
+; return 0;
+; }
+
+source_filename = "pr34390.c"
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.12.0"
+
+%struct.anon = type { i32 }
+
+; CHECK: @a.0 = internal unnamed_addr global i32 0, align 4, !dbg ![[GVE:.*]]
+ at a = internal global %struct.anon zeroinitializer, align 4, !dbg !0
+
+define i32 @main() #0 !dbg !15 {
+entry:
+ %retval = alloca i32, align 4
+ store i32 0, i32* %retval, align 4
+ %0 = load i32, i32* getelementptr inbounds (%struct.anon, %struct.anon* @a, i32 0, i32 0), align 4, !dbg !18
+ %inc = add nsw i32 %0, 1, !dbg !18
+ store i32 %inc, i32* getelementptr inbounds (%struct.anon, %struct.anon* @a, i32 0, i32 0), align 4, !dbg !18
+ ret i32 0, !dbg !19
+}
+
+attributes #0 = { noinline nounwind optnone ssp uwtable }
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12, !13}
+
+; CHECK: ![[GVE]] = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 3, type: !6, isLocal: true, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (trunk 312175) (llvm/trunk 312146)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
+!3 = !DIFile(filename: "test.c", directory: "/")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, size: 32, elements: !7)
+!7 = !{!8}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "f0", scope: !6, file: !3, line: 2, baseType: !9, size: 32)
+!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{i32 7, !"PIC Level", i32 2}
+!15 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 4, type: !16, isLocal: false, isDefinition: true, scopeLine: 4, isOptimized: false, unit: !2, variables: !4)
+!16 = !DISubroutineType(types: !17)
+!17 = !{!9}
+!18 = !DILocation(line: 5, column: 7, scope: !15)
+!19 = !DILocation(line: 6, column: 3, scope: !15)
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