From 9d05986cc590a0df3fcd38565068be554910ab31 Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Tue, 4 Dec 2012 21:33:58 +0000 Subject: [PATCH] Use the 'count' attribute to calculate the upper bound of an array. The count attribute is more accurate with regards to the size of an array. It also obviates the upper bound attribute in the subrange. We can also better handle an unbound array by setting the count to -1 instead of the lower bound to 1 and upper bound to 0. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169311 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/CGDebugInfo.cpp | 35 +++++-------------- test/CodeGenCXX/debug-info-flex-member.cpp | 2 +- .../debug-info-zero-length-arrays.cpp | 2 +- 3 files changed, 11 insertions(+), 28 deletions(-) diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp index a4182afd1e..f3468f29c1 100644 --- a/lib/CodeGen/CGDebugInfo.cpp +++ b/lib/CodeGen/CGDebugInfo.cpp @@ -1473,25 +1473,19 @@ llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty, llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty, llvm::DIFile Unit) { llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit); - int64_t NumElems = Ty->getNumElements(); - int64_t LowerBound = 0; - int64_t Count = NumElems; - if (NumElems == 0) + int64_t Count = Ty->getNumElements(); + if (Count == 0) // If number of elements are not known then this is an unbounded array. - // Use Low = 1, Hi = 0 to express such arrays. - LowerBound = 1; - else - --NumElems; + // Use Count == -1 to express such arrays. + Count = -1; - llvm::Value *Subscript = DBuilder.getOrCreateSubrange(LowerBound, NumElems, - Count); + llvm::Value *Subscript = DBuilder.getOrCreateSubrange(0, Count); llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscript); uint64_t Size = CGM.getContext().getTypeSize(Ty); uint64_t Align = CGM.getContext().getTypeAlign(Ty); - return - DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray); + return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray); } llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty, @@ -1532,23 +1526,12 @@ llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty, // struct foo { // int x[0]; // }; - int64_t UpperBound = 0; - int64_t LowerBound = 0; - int64_t Count = -1; - if (const ConstantArrayType *CAT = dyn_cast(Ty)) { + int64_t Count = -1; // Count == -1 is an unbounded array. + if (const ConstantArrayType *CAT = dyn_cast(Ty)) Count = CAT->getSize().getZExtValue(); - if (Count) - UpperBound = Count - 1; - } else { - // This is an unbounded array. Use Low = 1, Hi = 0 to express such - // arrays. - LowerBound = 1; - } // FIXME: Verify this is right for VLAs. - Subscripts.push_back(DBuilder.getOrCreateSubrange(LowerBound, - UpperBound, - Count)); + Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count)); EltTy = Ty->getElementType(); } diff --git a/test/CodeGenCXX/debug-info-flex-member.cpp b/test/CodeGenCXX/debug-info-flex-member.cpp index d38634cacf..11329aa1e2 100644 --- a/test/CodeGenCXX/debug-info-flex-member.cpp +++ b/test/CodeGenCXX/debug-info-flex-member.cpp @@ -1,6 +1,6 @@ // RUN: %clang_cc1 -emit-llvm -g -triple x86_64-apple-darwin %s -o - | FileCheck %s -// CHECK: metadata !{i32 {{.*}}, i64 1, i64 0, i64 -1} ; [ DW_TAG_subrange_type ] +// CHECK: metadata !{i32 {{.*}}, i64 0, i64 -1} ; [ DW_TAG_subrange_type ] struct StructName { int member[]; diff --git a/test/CodeGenCXX/debug-info-zero-length-arrays.cpp b/test/CodeGenCXX/debug-info-zero-length-arrays.cpp index a7944c09c6..37e50cbe12 100644 --- a/test/CodeGenCXX/debug-info-zero-length-arrays.cpp +++ b/test/CodeGenCXX/debug-info-zero-length-arrays.cpp @@ -10,4 +10,4 @@ A a; // CHECK: [[ARRAY_TYPE]] = metadata !{i32 {{.*}}, null, metadata !"", null, i32 0, i64 0, i64 32, i32 0, i32 0, metadata [[BASE_TYPE:.*]], metadata [[ELEM_TYPE:.*]], i32 0, i32 0} ; [ DW_TAG_array_type ] // CHECK: [[BASE_TYPE]] = metadata !{i32 {{.*}}, null, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] // CHECK: [[ELEM_TYPE]] = metadata !{metadata [[SUBRANGE:.*]]} -// CHECK: [[SUBRANGE]] = metadata !{i32 786465, i64 1, i64 0, i64 -1} ; [ DW_TAG_subrange_type ] [1, 0] +// CHECK: [[SUBRANGE]] = metadata !{i32 786465, i64 0, i64 -1} ; [ DW_TAG_subrange_type ] [unbound] -- 2.40.0