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Revert "Debug Info: Using declarations/DW_TAG_imported_declaration of variables, types, and functions." 

This reverts commit r181393 (git 3923d6a87fe7b2c91cc4a7dbd90c4ec7e2316bcd).

This seems to be emitting too much extra debug info for two (known)
reasons:
* full class definitions are emitted when only declarations are expected
* unused using declarations still produce DW_TAG_imported_declarations

llvm-svn: 181947
This commit is contained in:
David Blaikie 2013-05-15 23:46:19 +00:00
parent a7f94ce8a3
commit db35281468
4 changed files with 20 additions and 103 deletions
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57
clang/lib/CodeGen/CGDebugInfo.cpp
View File

@ -2173,30 +2173,6 @@ llvm::DIType CGDebugInfo::CreateMemberType(llvm::DIFile Unit, QualType FType,
return Ty;
}
llvm::DIDescriptor CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
// We only need a declaration (not a definition) of the type - so use whatever
// we would otherwise do to get a type for a pointee. (forward declarations in
// limited debug info, full definitions (if the type definition is available)
// in unlimited debug info)
if (const TypeDecl *TD = dyn_cast<TypeDecl>(D)) {
llvm::DIFile DefUnit = getOrCreateFile(TD->getLocation());
return CreatePointeeType(CGM.getContext().getTypeDeclType(TD), DefUnit);
}
// Otherwise fall back to a fairly rudimentary cache of existing declarations.
// This doesn't handle providing declarations (for functions or variables) for
// entities without definitions in this TU, nor when the definition proceeds
// the call to this function.
// FIXME: This should be split out into more specific maps with support for
// emitting forward declarations and merging definitions with declarations,
// the same way as we do for types.
llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator I =
DeclCache.find(D->getCanonicalDecl());
if (I == DeclCache.end())
return llvm::DIDescriptor();
llvm::Value *V = I->second;
return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(V));
}
/// getFunctionDeclaration - Return debug info descriptor to describe method
/// declaration for the given method definition.
llvm::DISubprogram CGDebugInfo::getFunctionDeclaration(const Decl *D) {
@ -2368,8 +2344,6 @@ void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, QualType FnType,
getLineNumber(CurLoc), Flags,
CGM.getLangOpts().Optimize,
Fn, TParamsArray, SPDecl);
if (HasDecl)
DeclCache.insert(std::make_pair(D->getCanonicalDecl(), llvm::WeakVH(SP)));
// Push function on region stack.
llvm::MDNode *SPN = SP;
@ -2980,11 +2954,10 @@ void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
LinkageName = StringRef();
llvm::DIDescriptor DContext =
getContextDescriptor(dyn_cast<Decl>(D->getDeclContext()));
llvm::DIGlobalVariable GV = DBuilder.createStaticVariable(DContext, DeclName, LinkageName,
DBuilder.createStaticVariable(DContext, DeclName, LinkageName,
Unit, LineNo, getOrCreateType(T, Unit),
Var->hasInternalLinkage(), Var,
getStaticDataMemberDeclaration(D));
DeclCache.insert(std::make_pair(D->getCanonicalDecl(), llvm::WeakVH(GV)));
}
/// EmitGlobalVariable - Emit information about an objective-c interface.
@ -3029,38 +3002,22 @@ void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
// Do not use DIGlobalVariable for enums.
if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
return;
llvm::DIGlobalVariable GV = DBuilder.createStaticVariable(Unit, Name, Name, Unit,
DBuilder.createStaticVariable(Unit, Name, Name, Unit,
getLineNumber(VD->getLocation()),
Ty, true, Init,
getStaticDataMemberDeclaration(VD));
DeclCache.insert(std::make_pair(VD->getCanonicalDecl(), llvm::WeakVH(GV)));
}
llvm::DIScope CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
if (!LexicalBlockStack.empty())
return llvm::DIScope(LexicalBlockStack.back());
return getContextDescriptor(D);
}
void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
llvm::DIScope Scope =
LexicalBlockStack.empty()
? getContextDescriptor(cast<Decl>(UD.getDeclContext()))
: llvm::DIScope(LexicalBlockStack.back());
DBuilder.createImportedModule(
getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
getOrCreateNameSpace(UD.getNominatedNamespace()),
Scope, getOrCreateNameSpace(UD.getNominatedNamespace()),
getLineNumber(UD.getLocation()));
}
void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
assert(UD.shadow_size() &&
"We shouldn't be codegening an invalid UsingDecl containing no decls");
// Emitting one decl is sufficient - debuggers can detect that this is an
// overloaded name & provide lookup for all the overloads.
const UsingShadowDecl &USD = **UD.shadow_begin();
if (llvm::DIDescriptor Target = getDeclarationOrDefinition(USD.getUnderlyingDecl()))
DBuilder.createImportedDeclaration(
getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
getLineNumber(USD.getLocation()));
}
/// getOrCreateNamesSpace - Return namespace descriptor for the given
/// namespace decl.
llvm::DINameSpace

13
clang/lib/CodeGen/CGDebugInfo.h
View File

@ -35,7 +35,6 @@ namespace clang {
class ObjCIvarDecl;
class ClassTemplateSpecializationDecl;
class GlobalDecl;
class UsingDecl;
namespace CodeGen {
class CodeGenModule;
@ -95,9 +94,6 @@ class CGDebugInfo {
llvm::DenseMap<const char *, llvm::WeakVH> DIFileCache;
llvm::DenseMap<const FunctionDecl *, llvm::WeakVH> SPCache;
/// \brief Cache declarations relevant to DW_TAG_imported_declarations (C++
/// using declarations) that aren't covered by other more specific caches.
llvm::DenseMap<const Decl *, llvm::WeakVH> DeclCache;
llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH> NameSpaceCache;
llvm::DenseMap<const Decl *, llvm::WeakVH> StaticDataMemberCache;
@ -269,9 +265,6 @@ public:
/// \brief - Emit C++ using directive.
void EmitUsingDirective(const UsingDirectiveDecl &UD);
/// \brief - Emit C++ using declaration.
void EmitUsingDecl(const UsingDecl &UD);
/// getOrCreateRecordType - Emit record type's standalone debug info.
llvm::DIType getOrCreateRecordType(QualType Ty, SourceLocation L);
@ -293,8 +286,6 @@ private:
/// getContextDescriptor - Get context info for the decl.
llvm::DIScope getContextDescriptor(const Decl *Decl);
llvm::DIScope getCurrentContextDescriptor(const Decl *Decl);
/// createRecordFwdDecl - Create a forward decl for a RecordType in a given
/// context.
llvm::DIType createRecordFwdDecl(const RecordDecl *, llvm::DIDescriptor);
@ -338,10 +329,6 @@ private:
llvm::DIType CreateMemberType(llvm::DIFile Unit, QualType FType,
StringRef Name, uint64_t *Offset);
/// \brief Retrieve the DIDescriptor, if any, for the canonical form of this
/// declaration.
llvm::DIDescriptor getDeclarationOrDefinition(const Decl *D);
/// getFunctionDeclaration - Return debug info descriptor to describe method
/// declaration for the given method definition.
llvm::DISubprogram getFunctionDeclaration(const Decl *D);

7
clang/lib/CodeGen/CGDecl.cpp
View File

@ -72,13 +72,14 @@ void CodeGenFunction::EmitDecl(const Decl &D) {
case Decl::Block:
case Decl::Captured:
case Decl::ClassScopeFunctionSpecialization:
case Decl::UsingShadow:
llvm_unreachable("Declaration should not be in declstmts!");
case Decl::Function: // void X();
case Decl::Record: // struct/union/class X;
case Decl::Enum: // enum X;
case Decl::EnumConstant: // enum ? { X = ? }
case Decl::CXXRecord: // struct/union/class X; [C++]
case Decl::Using: // using X; [C++]
case Decl::UsingShadow:
case Decl::NamespaceAlias:
case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
case Decl::Label: // __label__ x;
@ -88,10 +89,6 @@ void CodeGenFunction::EmitDecl(const Decl &D) {
// None of these decls require codegen support.
return;
case Decl::Using: // using X; [C++]
if (CGDebugInfo *DI = getDebugInfo())
DI->EmitUsingDecl(cast<UsingDecl>(D));
return;
case Decl::UsingDirective: // using namespace X; [C++]
if (CGDebugInfo *DI = getDebugInfo())
DI->EmitUsingDirective(cast<UsingDirectiveDecl>(D));

46
clang/test/CodeGenCXX/debug-info-namespace.cpp
View File

@ -4,11 +4,6 @@ namespace A {
#line 1 "foo.cpp"
namespace B {
int i;
void f1() { }
void f1(int) { }
struct foo;
struct bar { };
typedef bar baz;
}
using namespace B;
}
@ -21,41 +16,22 @@ int func(bool b) {
return i;
}
using namespace A;
using B::foo;
using B::bar;
using B::f1;
using B::i;
using B::baz;
bar x;
return i;
return B::i;
}
// This should work even if 'i' and 'func' were declarations & not definitions,
// but it doesn't yet.
// CHECK: [[CU:![0-9]*]] = {{.*}}[[MODULES:![0-9]*]], metadata !""} ; [ DW_TAG_compile_unit ]
// CHECK: [[FILE:![0-9]*]] {{.*}}debug-info-namespace.cpp"
// CHECK: [[FOOCPP:![0-9]*]] = metadata !{metadata !"foo.cpp", {{.*}}
// CHECK: [[NS:![0-9]*]] = {{.*}}, metadata [[FILE2:![0-9]*]], metadata [[CTXT:![0-9]*]], {{.*}} ; [ DW_TAG_namespace ] [B] [line 1]
// CHECK: [[FUNC:![0-9]*]] {{.*}} ; [ DW_TAG_subprogram ] [line 9] [def] [func]
// CHECK: [[FILE2:![0-9]*]]} ; [ DW_TAG_file_type ] [{{.*}}foo.cpp]
// CHECK: [[VAR:![0-9]*]] = {{.*}}, metadata [[NS:![0-9]*]], metadata !"i", {{.*}} ; [ DW_TAG_variable ] [i]
// CHECK: [[NS]] = {{.*}}, metadata [[FILE2]], metadata [[CTXT:![0-9]*]], {{.*}} ; [ DW_TAG_namespace ] [B] [line 1]
// CHECK: [[CTXT]] = {{.*}}, metadata [[FILE]], null, {{.*}} ; [ DW_TAG_namespace ] [A] [line 3]
// CHECK: [[F1:![0-9]*]] {{.*}} ; [ DW_TAG_subprogram ] [line 4] [def] [f1]
// CHECK: [[FUNC:![0-9]*]] {{.*}} ; [ DW_TAG_subprogram ] [line 14] [def] [func]
// CHECK: [[FILE2]]} ; [ DW_TAG_file_type ] [{{.*}}foo.cpp]
// CHECK: [[I:![0-9]*]] = {{.*}}, metadata [[NS]], metadata !"i", {{.*}} ; [ DW_TAG_variable ] [i]
// CHECK: [[MODULES]] = metadata !{metadata [[M1:![0-9]*]], metadata [[M2:![0-9]*]], metadata [[M3:![0-9]*]], metadata [[M4:![0-9]*]], metadata [[M5:![0-9]*]], metadata [[M6:![0-9]*]], metadata [[M7:![0-9]*]], metadata [[M8:![0-9]*]], metadata [[M9:![0-9]*]]}
// CHECK: [[M1]] = metadata !{i32 {{[0-9]*}}, metadata [[CTXT]], metadata [[NS]], i32 9} ; [ DW_TAG_imported_module ]
// CHECK: [[M2]] = metadata !{i32 {{[0-9]*}}, metadata [[CU]], metadata [[CTXT]], i32 12} ; [ DW_TAG_imported_module ]
// CHECK: [[M3]] = metadata !{i32 {{[0-9]*}}, metadata [[LEX:![0-9]*]], metadata [[NS]], i32 16} ; [ DW_TAG_imported_module ]
// CHECK: [[LEX]] = metadata !{i32 {{[0-9]*}}, metadata [[FILE2]], metadata [[FUNC]], i32 15, i32 0, i32 0} ; [ DW_TAG_lexical_block ]
// CHECK: [[M4]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[CTXT]], i32 19} ; [ DW_TAG_imported_module ]
// CHECK: [[M5]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[FOO:![0-9]*]], i32 20} ; [ DW_TAG_imported_declaration ]
// CHECK: [[FOO]] {{.*}} ; [ DW_TAG_structure_type ] [foo] [line 5, size 0, align 0, offset 0] [fwd] [from ]
// CHECK: [[M6]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[BAR:![0-9]*]], i32 21} ; [ DW_TAG_imported_declaration ]
// CHECK: [[BAR]] {{.*}} ; [ DW_TAG_structure_type ] [bar] [line 6, {{.*}}] [from ]
// CHECK: [[M7]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[F1]], i32 22} ; [ DW_TAG_imported_declaration ]
// CHECK: [[M8]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[I]], i32 23} ; [ DW_TAG_imported_declaration ]
// CHECK: [[M9]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[BAZ:![0-9]*]], i32 24} ; [ DW_TAG_imported_declaration ]
// CHECK: [[BAZ]] = metadata !{i32 {{[0-9]*}}, metadata [[FOOCPP]], metadata [[NS]], {{.*}} ; [ DW_TAG_typedef ] [baz] {{.*}} [from bar]
// CHECK: [[MODULES]] = metadata !{metadata [[M1:![0-9]*]], metadata [[M2:![0-9]*]], metadata [[M3:![0-9]*]], metadata [[M4:![0-9]*]]}
// CHECK: [[M1]] = metadata !{i32 {{[0-9]*}}, metadata [[CTXT]], metadata [[NS]], i32 4} ; [ DW_TAG_imported_module ]
// CHECK: [[M2]] = metadata !{i32 {{[0-9]*}}, metadata [[CU]], metadata [[CTXT]], i32 7} ; [ DW_TAG_imported_module ]
// CHECK: [[M3]] = metadata !{i32 {{[0-9]*}}, metadata [[LEX:![0-9]*]], metadata [[NS]], i32 11} ; [ DW_TAG_imported_module ]
// CHECK: [[LEX]] = metadata !{i32 {{[0-9]*}}, metadata [[FILE2]], metadata [[FUNC]], i32 10, i32 0, i32 0} ; [ DW_TAG_lexical_block ]
// CHECK: [[M4]] = metadata !{i32 {{[0-9]*}}, metadata [[FUNC]], metadata [[CTXT]], i32 14} ; [ DW_TAG_imported_module ]
// FIXME: It is confused on win32 to generate file entry when dosish filename is given.
// REQUIRES: shell