From: Adrian Prantl Date: Tue, 6 Jan 2015 17:14:10 +0000 (+0000) Subject: Reapply: Teach SROA how to update debug info for fragmented variables. X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=46cb54c0fb39dd03fb30e3a1c36bdf88b31bca1e;p=oota-llvm.git Reapply: Teach SROA how to update debug info for fragmented variables. This also rolls in the changes discussed in http://reviews.llvm.org/D6766. Defers migrating the debug info for new allocas until after all partitions are created. Thanks to Chandler for reviewing! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225272 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/lib/Transforms/Scalar/SROA.cpp b/lib/Transforms/Scalar/SROA.cpp index ed161fd4af3..d0c6bd05635 100644 --- a/lib/Transforms/Scalar/SROA.cpp +++ b/lib/Transforms/Scalar/SROA.cpp @@ -1240,6 +1240,10 @@ class SROA : public FunctionPass { /// currently in the promotable queue. SetVector> SpeculatableSelects; + /// Debug intrinsics do not show up as regular uses in the + /// IR. This side-table holds the missing use edges. + DenseMap DbgDeclares; + public: SROA(bool RequiresDomTree = true) : FunctionPass(ID), RequiresDomTree(RequiresDomTree), C(nullptr), @@ -1257,8 +1261,8 @@ private: friend class AllocaSliceRewriter; bool presplitLoadsAndStores(AllocaInst &AI, AllocaSlices &AS); - bool rewritePartition(AllocaInst &AI, AllocaSlices &AS, - AllocaSlices::Partition &P); + AllocaInst *rewritePartition(AllocaInst &AI, AllocaSlices &AS, + AllocaSlices::Partition &P); bool splitAlloca(AllocaInst &AI, AllocaSlices &AS); bool runOnAlloca(AllocaInst &AI); void clobberUse(Use &U); @@ -3964,8 +3968,8 @@ bool SROA::presplitLoadsAndStores(AllocaInst &AI, AllocaSlices &AS) { /// appropriate new offsets. It also evaluates how successful the rewrite was /// at enabling promotion and if it was successful queues the alloca to be /// promoted. -bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &AS, - AllocaSlices::Partition &P) { +AllocaInst *SROA::rewritePartition(AllocaInst &AI, AllocaSlices &AS, + AllocaSlices::Partition &P) { // Try to compute a friendly type for this partition of the alloca. This // won't always succeed, in which case we fall back to a legal integer type // or an i8 array of an appropriate size. @@ -4003,6 +4007,7 @@ bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &AS, NewAI = &AI; // FIXME: We should be able to bail at this point with "nothing changed". // FIXME: We might want to defer PHI speculation until after here. + // FIXME: return nullptr; } else { unsigned Alignment = AI.getAlignment(); if (!Alignment) { @@ -4098,7 +4103,7 @@ bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &AS, PostPromotionWorklist.pop_back(); } - return true; + return NewAI; } /// \brief Walks the slices of an alloca and form partitions based on them, @@ -4137,9 +4142,24 @@ bool SROA::splitAlloca(AllocaInst &AI, AllocaSlices &AS) { if (!IsSorted) std::sort(AS.begin(), AS.end()); + /// \brief Describes the allocas introduced by rewritePartition + /// in order to migrate the debug info. + struct Piece { + AllocaInst *Alloca; + uint64_t Offset; + uint64_t Size; + Piece(AllocaInst *AI, uint64_t O, uint64_t S) + : Alloca(AI), Offset(O), Size(S) {} + }; + SmallVector Pieces; + // Rewrite each partition. for (auto &P : AS.partitions()) { - Changed |= rewritePartition(AI, AS, P); + if (AllocaInst *NewAI = rewritePartition(AI, AS, P)) { + Changed = true; + if (NewAI != &AI) + Pieces.push_back(Piece(NewAI, P.beginOffset(), P.size())); + } ++NumPartitions; } @@ -4147,6 +4167,28 @@ bool SROA::splitAlloca(AllocaInst &AI, AllocaSlices &AS) { MaxPartitionsPerAlloca = std::max(NumPartitions, MaxPartitionsPerAlloca); + // Migrate debug information from the old alloca to the new alloca(s) + // and the individial partitions. + if (DbgDeclareInst *DbgDecl = DbgDeclares.lookup(&AI)) { + DIVariable Var(DbgDecl->getVariable()); + DIExpression Expr(DbgDecl->getExpression()); + DIBuilder DIB(*AI.getParent()->getParent()->getParent(), + /*AllowUnresolved*/ false); + bool IsSplit = Pieces.size() > 1; + for (auto Piece : Pieces) { + // Create a piece expression describing the new partition or reuse AI's + // expression if there is only one partition. + if (IsSplit) + Expr = DIB.createPieceExpression(Piece.Offset, Piece.Size); + Instruction *NewDDI = DIB.insertDeclare(Piece.Alloca, Var, Expr, &AI); + NewDDI->setDebugLoc(DbgDecl->getDebugLoc()); + assert((!DbgDeclares.count(Piece.Alloca) || + DbgDeclares[Piece.Alloca] == cast(NewDDI) + ) && "alloca already described"); + DbgDeclares.insert(std::make_pair(Piece.Alloca, + cast(NewDDI))); + } + } return Changed; } @@ -4258,8 +4300,13 @@ void SROA::deleteDeadInstructions( DeadInsts.insert(U); } - if (AllocaInst *AI = dyn_cast(I)) + if (AllocaInst *AI = dyn_cast(I)) { DeletedAllocas.insert(AI); + if (DbgDeclareInst *DbgDecl = DbgDeclares.lookup(AI)) { + DbgDecl->eraseFromParent(); + DbgDeclares.erase(AI); + } + } ++NumDeleted; I->eraseFromParent(); @@ -4374,11 +4421,16 @@ bool SROA::runOnFunction(Function &F) { DT = DTWP ? &DTWP->getDomTree() : nullptr; AC = &getAnalysis().getAssumptionCache(F); + DbgDeclares.clear(); BasicBlock &EntryBB = F.getEntryBlock(); for (BasicBlock::iterator I = EntryBB.begin(), E = std::prev(EntryBB.end()); - I != E; ++I) + I != E; ++I) { if (AllocaInst *AI = dyn_cast(I)) Worklist.insert(AI); + else if (DbgDeclareInst *DDI = dyn_cast(I)) + if (auto AI = dyn_cast_or_null(DDI->getAddress())) + DbgDeclares.insert(std::make_pair(AI, DDI)); + } bool Changed = false; // A set of deleted alloca instruction pointers which should be removed from diff --git a/test/DebugInfo/X86/array2.ll b/test/DebugInfo/X86/array2.ll index 6dfa8d71783..74dd9303d75 100644 --- a/test/DebugInfo/X86/array2.ll +++ b/test/DebugInfo/X86/array2.ll @@ -13,12 +13,12 @@ ; } ; ; RUN: opt %s -O2 -S -o - | FileCheck %s -; Test that we do not lower dbg.declares for arrays. +; Test that we correctly lower dbg.declares for arrays. ; ; CHECK: define i32 @main -; CHECK: call void @llvm.dbg.value -; CHECK: call void @llvm.dbg.value -; CHECK: call void @llvm.dbg.declare +; CHECK: call void @llvm.dbg.value(metadata i32 42, i64 0, metadata ![[ARRAY:[0-9]+]], metadata ![[EXPR:[0-9]+]]) +; CHECK: ![[ARRAY]] = {{.*}}; [ DW_TAG_auto_variable ] [array] [line 6] +; CHECK: ![[EXPR]] = {{.*}}; [ DW_TAG_expression ] [DW_OP_piece offset=0, size=4] target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-apple-macosx10.9.0" diff --git a/test/DebugInfo/X86/sroasplit-1.ll b/test/DebugInfo/X86/sroasplit-1.ll new file mode 100644 index 00000000000..edb3f466f57 --- /dev/null +++ b/test/DebugInfo/X86/sroasplit-1.ll @@ -0,0 +1,97 @@ +; RUN: opt %s -sroa -verify -S -o - | FileCheck %s +; +; Test that we can partial emit debug info for aggregates repeatedly +; split up by SROA. +; +; // Compile with -O1 +; typedef struct { +; int a; +; long int b; +; } Inner; +; +; typedef struct { +; Inner inner[2]; +; } Outer; +; +; int foo(Outer outer) { +; Inner i1 = outer.inner[1]; +; return i1.a; +; } +; + +; Verify that SROA creates a variable piece when splitting i1. +; CHECK: %[[I1:.*]] = alloca [12 x i8], align 4 +; CHECK: call void @llvm.dbg.declare(metadata [12 x i8]* %[[I1]], metadata ![[VAR:[0-9]+]], metadata ![[PIECE1:[0-9]+]]) +; CHECK: call void @llvm.dbg.value(metadata i32 %[[A:.*]], i64 0, metadata ![[VAR]], metadata ![[PIECE2:[0-9]+]]) +; CHECK: ret i32 %[[A]] +; Read Var and Piece: +; CHECK: ![[VAR]] = {{.*}} ; [ DW_TAG_auto_variable ] [i1] [line 11] +; CHECK: ![[PIECE1]] = {{.*}} ; [ DW_TAG_expression ] [DW_OP_piece offset=4, size=12] +; CHECK: ![[PIECE2]] = {{.*}} ; [ DW_TAG_expression ] [DW_OP_piece offset=0, size=4] + +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.9.0" + +%struct.Outer = type { [2 x %struct.Inner] } +%struct.Inner = type { i32, i64 } + +; Function Attrs: nounwind ssp uwtable +define i32 @foo(%struct.Outer* byval align 8 %outer) #0 { +entry: + %i1 = alloca %struct.Inner, align 8 + call void @llvm.dbg.declare(metadata %struct.Outer* %outer, metadata !25, metadata !2), !dbg !26 + call void @llvm.dbg.declare(metadata %struct.Inner* %i1, metadata !27, metadata !2), !dbg !28 + %inner = getelementptr inbounds %struct.Outer* %outer, i32 0, i32 0, !dbg !28 + %arrayidx = getelementptr inbounds [2 x %struct.Inner]* %inner, i32 0, i64 1, !dbg !28 + %0 = bitcast %struct.Inner* %i1 to i8*, !dbg !28 + %1 = bitcast %struct.Inner* %arrayidx to i8*, !dbg !28 + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 16, i32 8, i1 false), !dbg !28 + %a = getelementptr inbounds %struct.Inner* %i1, i32 0, i32 0, !dbg !29 + %2 = load i32* %a, align 4, !dbg !29 + ret i32 %2, !dbg !29 +} + +; Function Attrs: nounwind readnone +declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 + +; Function Attrs: nounwind +declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2 + +attributes #0 = { nounwind ssp uwtable } +attributes #1 = { nounwind readnone } +attributes #2 = { nounwind } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!22, !23} +!llvm.ident = !{!24} + +!0 = !{!"0x11\0012\00clang version 3.5.0 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [ DW_TAG_compile_unit ] [sroasplit-1.c] [DW_LANG_C99] +!1 = !{!"sroasplit-1.c", !""} +!2 = !{} +!3 = !{!4} +!4 = !{!"0x2e\00foo\00foo\00\0010\000\001\000\006\00256\000\0010", !1, !5, !6, null, i32 (%struct.Outer*)* @foo, null, null, !2} ; [ DW_TAG_subprogram ] [ DW_TAG_subprogram ] [line 10] [def] [foo] +!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [ DW_TAG_file_type ] [sroasplit-1.c] +!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] +!7 = !{!8, !9} +!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed] +!9 = !{!"0x16\00Outer\008\000\000\000\000", !1, null, !10} ; [ DW_TAG_typedef ] [ DW_TAG_typedef ] [Outer] [line 8, size 0, align 0, offset 0] [from ] +!10 = !{!"0x13\00\006\00256\0064\000\000\000", !1, null, null, !11, null, null, null} ; [ DW_TAG_structure_type ] [line 6, size 256, align 64, offset 0] [def] [from ] +!11 = !{!12} +!12 = !{!"0xd\00inner\007\00256\0064\000\000", !1, !10, !13} ; [ DW_TAG_member ] [inner] [line 7, size 256, align 64, offset 0] [from ] +!13 = !{!"0x1\00\000\00256\0064\000\000", null, null, !14, !20, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 256, align 64, offset 0] [from Inner] +!14 = !{!"0x16\00Inner\004\000\000\000\000", !1, null, !15} ; [ DW_TAG_typedef ] [ DW_TAG_typedef ] [Inner] [line 4, size 0, align 0, offset 0] [from ] +!15 = !{!"0x13\00\001\00128\0064\000\000\000", !1, null, null, !16, null, null, null} ; [ DW_TAG_structure_type ] [line 1, size 128, align 64, offset 0] [def] [from ] +!16 = !{!17, !18} +!17 = !{!"0xd\00a\002\0032\0032\000\000", !1, !15, !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int] +!18 = !{!"0xd\00b\003\0064\0064\0064\000", !1, !15, !19} ; [ DW_TAG_member ] [b] [line 3, size 64, align 64, offset 64] [from long int] +!19 = !{!"0x24\00long int\000\0064\0064\000\000\005", null, null} ; [ DW_TAG_base_type ] [ DW_TAG_base_type ] [long int] [line 0, size 64, align 64, offset 0, enc DW_ATE_signed] +!20 = !{!21} +!21 = !{!"0x21\000\002"} ; [ DW_TAG_subrange_type ] [0, 1] +!22 = !{i32 2, !"Dwarf Version", i32 2} +!23 = !{i32 1, !"Debug Info Version", i32 2} +!24 = !{!"clang version 3.5.0 "} +!25 = !{!"0x101\00outer\0016777226\000", !4, !5, !9} ; [ DW_TAG_arg_variable ] [ DW_TAG_arg_variable ] [outer] [line 10] +!26 = !{i32 10, i32 0, !4, null} +!27 = !{!"0x100\00i1\0011\000", !4, !5, !14} ; [ DW_TAG_auto_variable ] [ DW_TAG_auto_variable ] [i1] [line 11] +!28 = !{i32 11, i32 0, !4, null} +!29 = !{i32 12, i32 0, !4, null} diff --git a/test/DebugInfo/X86/sroasplit-2.ll b/test/DebugInfo/X86/sroasplit-2.ll new file mode 100644 index 00000000000..4e68d0c9561 --- /dev/null +++ b/test/DebugInfo/X86/sroasplit-2.ll @@ -0,0 +1,102 @@ +; RUN: opt %s -sroa -verify -S -o - | FileCheck %s +; +; Test that we can partial emit debug info for aggregates repeatedly +; split up by SROA. +; +; // Compile with -O1 +; typedef struct { +; int a; +; int b; +; } Inner; +; +; typedef struct { +; Inner inner[2]; +; } Outer; +; +; int foo(Outer outer) { +; Inner i1 = outer.inner[1]; +; return i1.a; +; } +; + +; Verify that SROA creates a variable piece when splitting i1. +; CHECK: call void @llvm.dbg.value(metadata i64 %outer.coerce0, i64 0, metadata ![[O:[0-9]+]], metadata ![[PIECE1:[0-9]+]]), +; CHECK: call void @llvm.dbg.value(metadata i64 %outer.coerce1, i64 0, metadata ![[O]], metadata ![[PIECE2:[0-9]+]]), +; CHECK: call void @llvm.dbg.value({{.*}}, i64 0, metadata ![[I1:[0-9]+]], metadata ![[PIECE3:[0-9]+]]), +; CHECK-DAG: ![[O]] = {{.*}} [ DW_TAG_arg_variable ] [outer] [line 10] +; CHECK-DAG: ![[PIECE1]] = {{.*}} [ DW_TAG_expression ] [DW_OP_piece offset=0, size=8] +; CHECK-DAG: ![[PIECE2]] = {{.*}} [ DW_TAG_expression ] [DW_OP_piece offset=8, size=8] +; CHECK-DAG: ![[I1]] = {{.*}} [ DW_TAG_auto_variable ] [i1] [line 11] +; CHECK-DAG: ![[PIECE3]] = {{.*}} [ DW_TAG_expression ] [DW_OP_piece offset=0, size=4] + +; ModuleID = 'sroasplit-2.c' +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.9.0" + +%struct.Outer = type { [2 x %struct.Inner] } +%struct.Inner = type { i32, i32 } + +; Function Attrs: nounwind ssp uwtable +define i32 @foo(i64 %outer.coerce0, i64 %outer.coerce1) #0 { + %outer = alloca %struct.Outer, align 8 + %i1 = alloca %struct.Inner, align 4 + %1 = bitcast %struct.Outer* %outer to { i64, i64 }* + %2 = getelementptr { i64, i64 }* %1, i32 0, i32 0 + store i64 %outer.coerce0, i64* %2 + %3 = getelementptr { i64, i64 }* %1, i32 0, i32 1 + store i64 %outer.coerce1, i64* %3 + call void @llvm.dbg.declare(metadata %struct.Outer* %outer, metadata !24, metadata !2), !dbg !25 + call void @llvm.dbg.declare(metadata %struct.Inner* %i1, metadata !26, metadata !2), !dbg !27 + %4 = getelementptr inbounds %struct.Outer* %outer, i32 0, i32 0, !dbg !27 + %5 = getelementptr inbounds [2 x %struct.Inner]* %4, i32 0, i64 1, !dbg !27 + %6 = bitcast %struct.Inner* %i1 to i8*, !dbg !27 + %7 = bitcast %struct.Inner* %5 to i8*, !dbg !27 + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %6, i8* %7, i64 8, i32 4, i1 false), !dbg !27 + %8 = getelementptr inbounds %struct.Inner* %i1, i32 0, i32 0, !dbg !28 + %9 = load i32* %8, align 4, !dbg !28 + ret i32 %9, !dbg !28 +} + +; Function Attrs: nounwind readnone +declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 + +; Function Attrs: nounwind +declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2 + +attributes #0 = { nounwind ssp uwtable "no-frame-pointer-elim"="true" } +attributes #1 = { nounwind readnone } +attributes #2 = { nounwind } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!21, !22} +!llvm.ident = !{!23} + +!0 = !{!"0x11\0012\00clang version 3.5.0 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [ DW_TAG_compile_unit ] [sroasplit-2.c] [DW_LANG_C99] +!1 = !{!"sroasplit-2.c", !""} +!2 = !{} +!3 = !{!4} +!4 = !{!"0x2e\00foo\00foo\00\0010\000\001\000\006\00256\000\0010", !1, !5, !6, null, i32 (i64, i64)* @foo, null, null, !2} ; [ DW_TAG_subprogram ] [ DW_TAG_subprogram ] [line 10] [def] [foo] +!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [ DW_TAG_file_type ] [sroasplit-2.c] +!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] +!7 = !{!8, !9} +!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed] +!9 = !{!"0x16\00Outer\008\000\000\000\000", !1, null, !10} ; [ DW_TAG_typedef ] [ DW_TAG_typedef ] [Outer] [line 8, size 0, align 0, offset 0] [from ] +!10 = !{!"0x13\00\006\00128\0032\000\000\000", !1, null, null, !11, null, null, null} ; [ DW_TAG_structure_type ] [line 6, size 128, align 32, offset 0] [def] [from ] +!11 = !{!12} +!12 = !{!"0xd\00inner\007\00128\0032\000\000", !1, !10, !13} ; [ DW_TAG_member ] [inner] [line 7, size 128, align 32, offset 0] [from ] +!13 = !{!"0x1\00\000\00128\0032\000\000", null, null, !14, !19, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 128, align 32, offset 0] [from Inner] +!14 = !{!"0x16\00Inner\004\000\000\000\000", !1, null, !15} ; [ DW_TAG_typedef ] [ DW_TAG_typedef ] [Inner] [line 4, size 0, align 0, offset 0] [from ] +!15 = !{!"0x13\00\001\0064\0032\000\000\000", !1, null, null, !16, null, null, null} ; [ DW_TAG_structure_type ] [line 1, size 64, align 32, offset 0] [def] [from ] +!16 = !{!17, !18} +!17 = !{!"0xd\00a\002\0032\0032\000\000", !1, !15, !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int] +!18 = !{!"0xd\00b\003\0032\0032\0032\000", !1, !15, !8} ; [ DW_TAG_member ] [b] [line 3, size 32, align 32, offset 32] [from int] +!19 = !{!20} +!20 = !{!"0x21\000\002"} ; [ DW_TAG_subrange_type ] [0, 1] +!21 = !{i32 2, !"Dwarf Version", i32 2} +!22 = !{i32 1, !"Debug Info Version", i32 2} +!23 = !{!"clang version 3.5.0 "} +!24 = !{!"0x101\00outer\0016777226\000", !4, !5, !9} ; [ DW_TAG_arg_variable ] [ DW_TAG_arg_variable ] [outer] [line 10] +!25 = !{i32 10, i32 0, !4, null} +!26 = !{!"0x100\00i1\0011\000", !4, !5, !14} ; [ DW_TAG_auto_variable ] [ DW_TAG_auto_variable ] [i1] [line 11] +!27 = !{i32 11, i32 0, !4, null} +!28 = !{i32 12, i32 0, !4, null} diff --git a/test/DebugInfo/X86/sroasplit-3.ll b/test/DebugInfo/X86/sroasplit-3.ll new file mode 100644 index 00000000000..b38eded22da --- /dev/null +++ b/test/DebugInfo/X86/sroasplit-3.ll @@ -0,0 +1,63 @@ +; RUN: opt %s -sroa -verify -S -o - | FileCheck %s +; ModuleID = 'test.c' +; Test that SROA updates the debug info correctly if an alloca was rewritten but +; not partitioned into multiple allocas. +; +; CHECK: call void @llvm.dbg.value(metadata float %s.coerce, i64 0, metadata ![[VAR:[0-9]+]], metadata ![[EXPR:[0-9]+]]) +; CHECK: ![[VAR]] = {{.*}} [ DW_TAG_arg_variable ] [s] [line 3] +; CHECK: ![[EXPR]] = {{.*}} [ DW_TAG_expression ] +; CHECK-NOT: DW_OP_piece + +; +; struct S { float f; }; +; +; float foo(struct S s) { +; return s.f; +; } +target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-apple-macosx10.10.0" + +%struct.S = type { float } + +; Function Attrs: nounwind ssp uwtable +define float @foo(float %s.coerce) #0 { +entry: + %s = alloca %struct.S, align 4 + %coerce.dive = getelementptr %struct.S* %s, i32 0, i32 0 + store float %s.coerce, float* %coerce.dive, align 1 + call void @llvm.dbg.declare(metadata %struct.S* %s, metadata !16, metadata !17), !dbg !18 + %f = getelementptr inbounds %struct.S* %s, i32 0, i32 0, !dbg !19 + %0 = load float* %f, align 4, !dbg !19 + ret float %0, !dbg !19 +} + +; Function Attrs: nounwind readnone +declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 + +attributes #0 = { nounwind ssp uwtable } +attributes #1 = { nounwind readnone } + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!12, !13, !14} +!llvm.ident = !{!15} + +!0 = !{!"0x11\0012\00clang version 3.6.0 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/Volumes/Data/llvm/_build.ninja.debug/test.c] [DW_LANG_C99] +!1 = !{!"test.c", !"/Volumes/Data/llvm/_build.ninja.debug"} +!2 = !{} +!3 = !{!4} +!4 = !{!"0x2e\00foo\00foo\00\003\000\001\000\000\00256\000\003", !1, !5, !6, null, float (float)* @foo, null, null, !2} ; [ DW_TAG_subprogram ] [line 3] [def] [foo] +!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [/Volumes/Data/llvm/_build.ninja.debug/test.c] +!6 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] +!7 = !{!8, !9} +!8 = !{!"0x24\00float\000\0032\0032\000\000\004", null, null} ; [ DW_TAG_base_type ] [float] [line 0, size 32, align 32, offset 0, enc DW_ATE_float] +!9 = !{!"0x13\00S\001\0032\0032\000\000\000", !1, null, null, !10, null, null, null} ; [ DW_TAG_structure_type ] [S] [line 1, size 32, align 32, offset 0] [def] [from ] +!10 = !{!11} +!11 = !{!"0xd\00f\001\0032\0032\000\000", !1, !9, !8} ; [ DW_TAG_member ] [f] [line 1, size 32, align 32, offset 0] [from float] +!12 = !{i32 2, !"Dwarf Version", i32 2} +!13 = !{i32 2, !"Debug Info Version", i32 2} +!14 = !{i32 1, !"PIC Level", i32 2} +!15 = !{!"clang version 3.6.0 "} +!16 = !{!"0x101\00s\0016777219\000", !4, !5, !9} ; [ DW_TAG_arg_variable ] [s] [line 3] +!17 = !{!"0x102"} ; [ DW_TAG_expression ] +!18 = !{i32 3, i32 20, !4, null} +!19 = !{i32 4, i32 2, !4, null}