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Switch the type field in DIVariable and DIGlobalVariable over to DITypeRefs.

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This allows us to catch more opportunities for ODR-based type uniquing
during LTO.
Paired commit with CFE which updates some testcases to verify the new
DIBuilder behavior.

llvm-svn: 204106
This commit is contained in:
Adrian Prantl 2014-03-18 02:34:58 +00:00
parent ca108f3f54
commit c28a560ab2
9 changed files with 51 additions and 32 deletions
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2
docs/SourceLevelDebugging.rst
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@ -567,7 +567,7 @@ Local variables
metadata, ;; Reference to file where defined
i32, ;; 24 bit - Line number where defined
;; 8 bit - Argument number. 1 indicates 1st argument.
metadata, ;; Type descriptor
metadata, ;; Reference to the type descriptor
i32, ;; flags
metadata ;; (optional) Reference to inline location
}

10
include/llvm/IR/DIBuilder.h
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@ -466,7 +466,7 @@ namespace llvm {
/// @param Val llvm::Value of the variable.
DIGlobalVariable
createGlobalVariable(StringRef Name, DIFile File, unsigned LineNo,
DIType Ty, bool isLocalToUnit, llvm::Value *Val);
DITypeRef Ty, bool isLocalToUnit, llvm::Value *Val);
/// \brief Create a new descriptor for the specified global.
/// @param Name Name of the variable.
@ -479,7 +479,7 @@ namespace llvm {
/// @param Val llvm::Value of the variable.
DIGlobalVariable
createGlobalVariable(StringRef Name, StringRef LinkageName, DIFile File,
unsigned LineNo, DIType Ty, bool isLocalToUnit,
unsigned LineNo, DITypeRef Ty, bool isLocalToUnit,
llvm::Value *Val);
/// createStaticVariable - Create a new descriptor for the specified
@ -497,7 +497,7 @@ namespace llvm {
DIGlobalVariable
createStaticVariable(DIDescriptor Context, StringRef Name,
StringRef LinkageName, DIFile File, unsigned LineNo,
DIType Ty, bool isLocalToUnit, llvm::Value *Val,
DITypeRef Ty, bool isLocalToUnit, llvm::Value *Val,
MDNode *Decl = NULL);
@ -518,7 +518,7 @@ namespace llvm {
DIVariable createLocalVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name,
DIFile File, unsigned LineNo,
DIType Ty, bool AlwaysPreserve = false,
DITypeRef Ty, bool AlwaysPreserve = false,
unsigned Flags = 0,
unsigned ArgNo = 0);
@ -537,7 +537,7 @@ namespace llvm {
/// number. 1 indicates 1st argument.
DIVariable createComplexVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name, DIFile F, unsigned LineNo,
DIType Ty, ArrayRef<Value *> Addr,
DITypeRef Ty, ArrayRef<Value *> Addr,
unsigned ArgNo = 0);
/// createFunction - Create a new descriptor for the specified subprogram.

14
include/llvm/IR/DebugInfo.h
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@ -224,6 +224,7 @@ template <typename T> class DIRef {
friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
friend DIScopeRef DIScope::getContext() const;
friend DIScopeRef DIScope::getRef() const;
friend class DIType;
/// Val can be either a MDNode or a MDString, in the latter,
/// MDString specifies the type identifier.
@ -284,6 +285,11 @@ protected:
public:
explicit DIType(const MDNode *N = 0) : DIScope(N) {}
operator DITypeRef () const {
assert(isType() &&
"constructing DITypeRef from an MDNode that is not a type");
return DITypeRef(&*getRef());
}
/// Verify - Verify that a type descriptor is well formed.
bool Verify() const;
@ -616,7 +622,7 @@ public:
}
unsigned getLineNumber() const { return getUnsignedField(7); }
DIType getType() const { return getFieldAs<DIType>(8); }
DITypeRef getType() const { return getFieldAs<DITypeRef>(8); }
unsigned isLocalToUnit() const { return getUnsignedField(9); }
unsigned isDefinition() const { return getUnsignedField(10); }
@ -648,7 +654,7 @@ public:
unsigned L = getUnsignedField(4);
return L >> 24;
}
DIType getType() const { return getFieldAs<DIType>(5); }
DITypeRef getType() const { return getFieldAs<DITypeRef>(5); }
/// isArtificial - Return true if this variable is marked as "artificial".
bool isArtificial() const {
@ -681,7 +687,9 @@ public:
/// isBlockByrefVariable - Return true if the variable was declared as
/// a "__block" variable (Apple Blocks).
bool isBlockByrefVariable() const { return getType().isBlockByrefStruct(); }
bool isBlockByrefVariable(const DITypeIdentifierMap &Map) const {
return (getType().resolve(Map)).isBlockByrefStruct();
}
/// isInlinedFnArgument - Return true if this variable provides debugging
/// information for an inlined function arguments.

12
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -115,11 +115,17 @@ template <typename T> T DbgVariable::resolve(DIRef<T> Ref) const {
return DD->resolve(Ref);
}
bool DbgVariable::isBlockByrefVariable() const {
assert(Var.isVariable() && "Invalid complex DbgVariable!");
return Var.isBlockByrefVariable(DD->getTypeIdentifierMap());
}
DIType DbgVariable::getType() const {
DIType Ty = Var.getType();
DIType Ty = Var.getType().resolve(DD->getTypeIdentifierMap());
// FIXME: isBlockByrefVariable should be reformulated in terms of complex
// addresses instead.
if (Var.isBlockByrefVariable()) {
if (Var.isBlockByrefVariable(DD->getTypeIdentifierMap())) {
/* Byref variables, in Blocks, are declared by the programmer as
"SomeType VarName;", but the compiler creates a
__Block_byref_x_VarName struct, and gives the variable VarName
@ -2301,7 +2307,7 @@ void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
const DebugLocEntry &Entry) {
DIVariable DV(Entry.getVariable());
if (Entry.isInt()) {
DIBasicType BTy(DV.getType());
DIBasicType BTy(resolve(DV.getType()));
if (BTy.Verify() && (BTy.getEncoding() == dwarf::DW_ATE_signed ||
BTy.getEncoding() == dwarf::DW_ATE_signed_char)) {
Streamer.EmitInt8(dwarf::DW_OP_consts, "DW_OP_consts");

10
lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -199,10 +199,7 @@ public:
assert(Var.isVariable() && "Invalid complex DbgVariable!");
return Var.hasComplexAddress();
}
bool isBlockByrefVariable() const {
assert(Var.isVariable() && "Invalid complex DbgVariable!");
return Var.isBlockByrefVariable();
}
bool isBlockByrefVariable() const;
unsigned getNumAddrElements() const {
assert(Var.isVariable() && "Invalid complex DbgVariable!");
return Var.getNumAddrElements();
@ -777,6 +774,11 @@ public:
return Ref.resolve(TypeIdentifierMap);
}
/// \brief Return the TypeIdentifierMap.
const DITypeIdentifierMap& getTypeIdentifierMap() const {
return TypeIdentifierMap;
}
/// Find the DwarfCompileUnit for the given CU Die.
DwarfCompileUnit *lookupUnit(const DIE *CU) const {
return CUDieMap.lookup(CU);

2
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
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@ -1604,7 +1604,7 @@ void DwarfCompileUnit::createGlobalVariableDIE(DIGlobalVariable GV) {
assert(GV.isGlobalVariable());
DIScope GVContext = GV.getContext();
DIType GTy = GV.getType();
DIType GTy = DD->resolve(GV.getType());
// If this is a static data member definition, some attributes belong
// to the declaration DIE.

15
lib/IR/DIBuilder.cpp
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@ -927,7 +927,7 @@ DISubrange DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Count) {
DIGlobalVariable DIBuilder::createGlobalVariable(StringRef Name,
StringRef LinkageName,
DIFile F, unsigned LineNumber,
DIType Ty, bool isLocalToUnit,
DITypeRef Ty, bool isLocalToUnit,
Value *Val) {
Value *Elts[] = {
GetTagConstant(VMContext, dwarf::DW_TAG_variable),
@ -951,7 +951,8 @@ DIGlobalVariable DIBuilder::createGlobalVariable(StringRef Name,
/// \brief Create a new descriptor for the specified global.
DIGlobalVariable DIBuilder::createGlobalVariable(StringRef Name, DIFile F,
unsigned LineNumber, DIType Ty,
unsigned LineNumber,
DITypeRef Ty,
bool isLocalToUnit,
Value *Val) {
return createGlobalVariable(Name, Name, F, LineNumber, Ty, isLocalToUnit,
@ -964,7 +965,8 @@ DIGlobalVariable DIBuilder::createStaticVariable(DIDescriptor Context,
StringRef Name,
StringRef LinkageName,
DIFile F, unsigned LineNumber,
DIType Ty, bool isLocalToUnit,
DITypeRef Ty,
bool isLocalToUnit,
Value *Val, MDNode *Decl) {
Value *Elts[] = {
GetTagConstant(VMContext, dwarf::DW_TAG_variable),
@ -989,14 +991,12 @@ DIGlobalVariable DIBuilder::createStaticVariable(DIDescriptor Context,
/// createVariable - Create a new descriptor for the specified variable.
DIVariable DIBuilder::createLocalVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name, DIFile File,
unsigned LineNo, DIType Ty,
unsigned LineNo, DITypeRef Ty,
bool AlwaysPreserve, unsigned Flags,
unsigned ArgNo) {
DIDescriptor Context(getNonCompileUnitScope(Scope));
assert((!Context || Context.isScope()) &&
"createLocalVariable should be called with a valid Context");
assert(Ty.isType() &&
"createLocalVariable should be called with a valid type");
Value *Elts[] = {
GetTagConstant(VMContext, Tag),
getNonCompileUnitScope(Scope),
@ -1027,7 +1027,8 @@ DIVariable DIBuilder::createLocalVariable(unsigned Tag, DIDescriptor Scope,
DIVariable DIBuilder::createComplexVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name, DIFile F,
unsigned LineNo,
DIType Ty, ArrayRef<Value *> Addr,
DITypeRef Ty,
ArrayRef<Value *> Addr,
unsigned ArgNo) {
SmallVector<Value *, 15> Elts;
Elts.push_back(GetTagConstant(VMContext, Tag));

16
lib/IR/DebugInfo.cpp
View File

@ -541,10 +541,11 @@ bool DIGlobalVariable::Verify() const {
if (getDisplayName().empty())
return false;
// Make sure context @ field 2 and type @ field 8 are MDNodes.
// Make sure context @ field 2 is an MDNode.
if (!fieldIsMDNode(DbgNode, 2))
return false;
if (!fieldIsMDNode(DbgNode, 8))
// Make sure that type @ field 8 is a DITypeRef.
if (!fieldIsTypeRef(DbgNode, 8))
return false;
// Make sure StaticDataMemberDeclaration @ field 12 is MDNode.
if (!fieldIsMDNode(DbgNode, 12))
@ -558,10 +559,11 @@ bool DIVariable::Verify() const {
if (!isVariable())
return false;
// Make sure context @ field 1 and type @ field 5 are MDNodes.
// Make sure context @ field 1 is an MDNode.
if (!fieldIsMDNode(DbgNode, 1))
return false;
if (!fieldIsMDNode(DbgNode, 5))
// Make sure that type @ field 5 is a DITypeRef.
if (!fieldIsTypeRef(DbgNode, 5))
return false;
return DbgNode->getNumOperands() >= 8;
}
@ -999,7 +1001,7 @@ void DebugInfoFinder::processModule(const Module &M) {
DIGlobalVariable DIG(GVs.getElement(i));
if (addGlobalVariable(DIG)) {
processScope(DIG.getContext());
processType(DIG.getType());
processType(DIG.getType().resolve(TypeIdentifierMap));
}
}
DIArray SPs = CU.getSubprograms();
@ -1133,7 +1135,7 @@ void DebugInfoFinder::processDeclare(const Module &M,
if (!NodesSeen.insert(DV))
return;
processScope(DIVariable(N).getContext());
processType(DIVariable(N).getType());
processType(DIVariable(N).getType().resolve(TypeIdentifierMap));
}
void DebugInfoFinder::processValue(const Module &M, const DbgValueInst *DVI) {
@ -1149,7 +1151,7 @@ void DebugInfoFinder::processValue(const Module &M, const DbgValueInst *DVI) {
if (!NodesSeen.insert(DV))
return;
processScope(DIVariable(N).getContext());
processType(DIVariable(N).getType());
processType(DIVariable(N).getType().resolve(TypeIdentifierMap));
}
/// addType - Add type into Tys.

2
test/Linker/type-unique-odr-a.ll
View File

@ -93,6 +93,6 @@ attributes #1 = { nounwind readnone }
!21 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!22 = metadata !{metadata !"clang version 3.5.0 "}
!23 = metadata !{i32 11, i32 0, metadata !15, null}
!24 = metadata !{i32 786688, metadata !19, metadata !"a", metadata !16, i32 8, metadata !4, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [a] [line 8]
!24 = metadata !{i32 786688, metadata !19, metadata !"a", metadata !16, i32 8, metadata !"_ZTS1A", i32 0, i32 0} ; [ DW_TAG_auto_variable ] [a] [line 8]
!25 = metadata !{i32 8, i32 0, metadata !19, null} ; [ DW_TAG_imported_declaration ]
!26 = metadata !{i32 9, i32 0, metadata !19, null}