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ASTDiagnostic.cpp
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ASTDiagnostic.cpp
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//===--- ASTDiagnostic.cpp - Diagnostic Printing Hooks for AST Nodes ------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements a diagnostic formatting hook for AST elements.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTDiagnostic.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTLambda.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/ExprCXX.h"
#include "clang/AST/TemplateBase.h"
#include "clang/AST/Type.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
// Returns a desugared version of the QualType, and marks ShouldAKA as true
// whenever we remove significant sugar from the type.
static QualType Desugar(ASTContext &Context, QualType QT, bool &ShouldAKA) {
QualifierCollector QC;
while (true) {
const Type *Ty = QC.strip(QT);
// Don't aka just because we saw an elaborated type...
if (const ElaboratedType *ET = dyn_cast<ElaboratedType>(Ty)) {
QT = ET->desugar();
continue;
}
// ... or a paren type ...
if (const ParenType *PT = dyn_cast<ParenType>(Ty)) {
QT = PT->desugar();
continue;
}
// ... or a macro defined type ...
if (const MacroQualifiedType *MDT = dyn_cast<MacroQualifiedType>(Ty)) {
QT = MDT->desugar();
continue;
}
// ...or a substituted template type parameter ...
if (const SubstTemplateTypeParmType *ST =
dyn_cast<SubstTemplateTypeParmType>(Ty)) {
QT = ST->desugar();
continue;
}
// ...or an attributed type...
if (const AttributedType *AT = dyn_cast<AttributedType>(Ty)) {
QT = AT->desugar();
continue;
}
// ...or an adjusted type...
if (const AdjustedType *AT = dyn_cast<AdjustedType>(Ty)) {
QT = AT->desugar();
continue;
}
// ... or an auto type.
if (const AutoType *AT = dyn_cast<AutoType>(Ty)) {
if (!AT->isSugared())
break;
QT = AT->desugar();
continue;
}
// Desugar FunctionType if return type or any parameter type should be
// desugared. Preserve nullability attribute on desugared types.
if (const FunctionType *FT = dyn_cast<FunctionType>(Ty)) {
bool DesugarReturn = false;
QualType SugarRT = FT->getReturnType();
QualType RT = Desugar(Context, SugarRT, DesugarReturn);
if (auto nullability = AttributedType::stripOuterNullability(SugarRT)) {
RT = Context.getAttributedType(
AttributedType::getNullabilityAttrKind(*nullability), RT, RT);
}
bool DesugarArgument = false;
SmallVector<QualType, 4> Args;
const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT);
if (FPT) {
for (QualType SugarPT : FPT->param_types()) {
QualType PT = Desugar(Context, SugarPT, DesugarArgument);
if (auto nullability =
AttributedType::stripOuterNullability(SugarPT)) {
PT = Context.getAttributedType(
AttributedType::getNullabilityAttrKind(*nullability), PT, PT);
}
Args.push_back(PT);
}
}
if (DesugarReturn || DesugarArgument) {
ShouldAKA = true;
QT = FPT ? Context.getFunctionType(RT, Args, FPT->getExtProtoInfo())
: Context.getFunctionNoProtoType(RT, FT->getExtInfo());
break;
}
}
// Desugar template specializations if any template argument should be
// desugared.
if (const TemplateSpecializationType *TST =
dyn_cast<TemplateSpecializationType>(Ty)) {
if (!TST->isTypeAlias()) {
bool DesugarArgument = false;
SmallVector<TemplateArgument, 4> Args;
for (unsigned I = 0, N = TST->getNumArgs(); I != N; ++I) {
const TemplateArgument &Arg = TST->getArg(I);
if (Arg.getKind() == TemplateArgument::Type)
Args.push_back(Desugar(Context, Arg.getAsType(), DesugarArgument));
else
Args.push_back(Arg);
}
if (DesugarArgument) {
ShouldAKA = true;
QT = Context.getTemplateSpecializationType(
TST->getTemplateName(), Args, QT);
}
break;
}
}
// Don't desugar magic Objective-C types.
if (QualType(Ty,0) == Context.getObjCIdType() ||
QualType(Ty,0) == Context.getObjCClassType() ||
QualType(Ty,0) == Context.getObjCSelType() ||
QualType(Ty,0) == Context.getObjCProtoType())
break;
// Don't desugar va_list.
if (QualType(Ty, 0) == Context.getBuiltinVaListType() ||
QualType(Ty, 0) == Context.getBuiltinMSVaListType())
break;
// Otherwise, do a single-step desugar.
QualType Underlying;
bool IsSugar = false;
switch (Ty->getTypeClass()) {
#define ABSTRACT_TYPE(Class, Base)
#define TYPE(Class, Base) \
case Type::Class: { \
const Class##Type *CTy = cast<Class##Type>(Ty); \
if (CTy->isSugared()) { \
IsSugar = true; \
Underlying = CTy->desugar(); \
} \
break; \
}
#include "clang/AST/TypeNodes.inc"
}
// If it wasn't sugared, we're done.
if (!IsSugar)
break;
// If the desugared type is a vector type, we don't want to expand
// it, it will turn into an attribute mess. People want their "vec4".
if (isa<VectorType>(Underlying))
break;
// Don't desugar through the primary typedef of an anonymous type.
if (const TagType *UTT = Underlying->getAs<TagType>())
if (const TypedefType *QTT = dyn_cast<TypedefType>(QT))
if (UTT->getDecl()->getTypedefNameForAnonDecl() == QTT->getDecl())
break;
// Record that we actually looked through an opaque type here.
ShouldAKA = true;
QT = Underlying;
}
// If we have a pointer-like type, desugar the pointee as well.
// FIXME: Handle other pointer-like types.
if (const PointerType *Ty = QT->getAs<PointerType>()) {
QT = Context.getPointerType(Desugar(Context, Ty->getPointeeType(),
ShouldAKA));
} else if (const auto *Ty = QT->getAs<ObjCObjectPointerType>()) {
QT = Context.getObjCObjectPointerType(Desugar(Context, Ty->getPointeeType(),
ShouldAKA));
} else if (const LValueReferenceType *Ty = QT->getAs<LValueReferenceType>()) {
QT = Context.getLValueReferenceType(Desugar(Context, Ty->getPointeeType(),
ShouldAKA));
} else if (const RValueReferenceType *Ty = QT->getAs<RValueReferenceType>()) {
QT = Context.getRValueReferenceType(Desugar(Context, Ty->getPointeeType(),
ShouldAKA));
} else if (const auto *Ty = QT->getAs<ObjCObjectType>()) {
if (Ty->getBaseType().getTypePtr() != Ty && !ShouldAKA) {
QualType BaseType = Desugar(Context, Ty->getBaseType(), ShouldAKA);
QT = Context.getObjCObjectType(BaseType, Ty->getTypeArgsAsWritten(),
llvm::makeArrayRef(Ty->qual_begin(),
Ty->getNumProtocols()),
Ty->isKindOfTypeAsWritten());
}
}
return QC.apply(Context, QT);
}
/// Convert the given type to a string suitable for printing as part of
/// a diagnostic.
///
/// There are four main criteria when determining whether we should have an
/// a.k.a. clause when pretty-printing a type:
///
/// 1) Some types provide very minimal sugar that doesn't impede the
/// user's understanding --- for example, elaborated type
/// specifiers. If this is all the sugar we see, we don't want an
/// a.k.a. clause.
/// 2) Some types are technically sugared but are much more familiar
/// when seen in their sugared form --- for example, va_list,
/// vector types, and the magic Objective C types. We don't
/// want to desugar these, even if we do produce an a.k.a. clause.
/// 3) Some types may have already been desugared previously in this diagnostic.
/// if this is the case, doing another "aka" would just be clutter.
/// 4) Two different types within the same diagnostic have the same output
/// string. In this case, force an a.k.a with the desugared type when
/// doing so will provide additional information.
///
/// \param Context the context in which the type was allocated
/// \param Ty the type to print
/// \param QualTypeVals pointer values to QualTypes which are used in the
/// diagnostic message
static std::string
ConvertTypeToDiagnosticString(ASTContext &Context, QualType Ty,
ArrayRef<DiagnosticsEngine::ArgumentValue> PrevArgs,
ArrayRef<intptr_t> QualTypeVals) {
// FIXME: Playing with std::string is really slow.
bool ForceAKA = false;
QualType CanTy = Ty.getCanonicalType();
std::string S = Ty.getAsString(Context.getPrintingPolicy());
std::string CanS = CanTy.getAsString(Context.getPrintingPolicy());
for (unsigned I = 0, E = QualTypeVals.size(); I != E; ++I) {
QualType CompareTy =
QualType::getFromOpaquePtr(reinterpret_cast<void*>(QualTypeVals[I]));
if (CompareTy.isNull())
continue;
if (CompareTy == Ty)
continue; // Same types
QualType CompareCanTy = CompareTy.getCanonicalType();
if (CompareCanTy == CanTy)
continue; // Same canonical types
std::string CompareS = CompareTy.getAsString(Context.getPrintingPolicy());
bool ShouldAKA = false;
QualType CompareDesugar = Desugar(Context, CompareTy, ShouldAKA);
std::string CompareDesugarStr =
CompareDesugar.getAsString(Context.getPrintingPolicy());
if (CompareS != S && CompareDesugarStr != S)
continue; // The type string is different than the comparison string
// and the desugared comparison string.
std::string CompareCanS =
CompareCanTy.getAsString(Context.getPrintingPolicy());
if (CompareCanS == CanS)
continue; // No new info from canonical type
ForceAKA = true;
break;
}
// Check to see if we already desugared this type in this
// diagnostic. If so, don't do it again.
bool Repeated = false;
for (unsigned i = 0, e = PrevArgs.size(); i != e; ++i) {
// TODO: Handle ak_declcontext case.
if (PrevArgs[i].first == DiagnosticsEngine::ak_qualtype) {
void *Ptr = (void*)PrevArgs[i].second;
QualType PrevTy(QualType::getFromOpaquePtr(Ptr));
if (PrevTy == Ty) {
Repeated = true;
break;
}
}
}
// Consider producing an a.k.a. clause if removing all the direct
// sugar gives us something "significantly different".
if (!Repeated) {
bool ShouldAKA = false;
QualType DesugaredTy = Desugar(Context, Ty, ShouldAKA);
if (ShouldAKA || ForceAKA) {
if (DesugaredTy == Ty) {
DesugaredTy = Ty.getCanonicalType();
}
std::string akaStr = DesugaredTy.getAsString(Context.getPrintingPolicy());
if (akaStr != S) {
S = "'" + S + "' (aka '" + akaStr + "')";
return S;
}
}
// Give some additional info on vector types. These are either not desugared
// or displaying complex __attribute__ expressions so add details of the
// type and element count.
if (const auto *VTy = Ty->getAs<VectorType>()) {
std::string DecoratedString;
llvm::raw_string_ostream OS(DecoratedString);
const char *Values = VTy->getNumElements() > 1 ? "values" : "value";
OS << "'" << S << "' (vector of " << VTy->getNumElements() << " '"
<< VTy->getElementType().getAsString(Context.getPrintingPolicy())
<< "' " << Values << ")";
return OS.str();
}
}
S = "'" + S + "'";
return S;
}
static bool FormatTemplateTypeDiff(ASTContext &Context, QualType FromType,
QualType ToType, bool PrintTree,
bool PrintFromType, bool ElideType,
bool ShowColors, raw_ostream &OS);
void clang::FormatASTNodeDiagnosticArgument(
DiagnosticsEngine::ArgumentKind Kind,
intptr_t Val,
StringRef Modifier,
StringRef Argument,
ArrayRef<DiagnosticsEngine::ArgumentValue> PrevArgs,
SmallVectorImpl<char> &Output,
void *Cookie,
ArrayRef<intptr_t> QualTypeVals) {
ASTContext &Context = *static_cast<ASTContext*>(Cookie);
size_t OldEnd = Output.size();
llvm::raw_svector_ostream OS(Output);
bool NeedQuotes = true;
switch (Kind) {
default: llvm_unreachable("unknown ArgumentKind");
case DiagnosticsEngine::ak_addrspace: {
assert(Modifier.empty() && Argument.empty() &&
"Invalid modifier for Qualfiers argument");
auto S = Qualifiers::getAddrSpaceAsString(static_cast<LangAS>(Val));
if (S.empty()) {
OS << (Context.getLangOpts().OpenCL ? "default" : "generic");
OS << " address space";
} else {
OS << "address space";
OS << " '" << S << "'";
}
NeedQuotes = false;
break;
}
case DiagnosticsEngine::ak_qual: {
assert(Modifier.empty() && Argument.empty() &&
"Invalid modifier for Qualfiers argument");
Qualifiers Q(Qualifiers::fromOpaqueValue(Val));
auto S = Q.getAsString();
if (S.empty()) {
OS << "unqualified";
NeedQuotes = false;
} else {
OS << S;
}
break;
}
case DiagnosticsEngine::ak_qualtype_pair: {
TemplateDiffTypes &TDT = *reinterpret_cast<TemplateDiffTypes*>(Val);
QualType FromType =
QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.FromType));
QualType ToType =
QualType::getFromOpaquePtr(reinterpret_cast<void*>(TDT.ToType));
if (FormatTemplateTypeDiff(Context, FromType, ToType, TDT.PrintTree,
TDT.PrintFromType, TDT.ElideType,
TDT.ShowColors, OS)) {
NeedQuotes = !TDT.PrintTree;
TDT.TemplateDiffUsed = true;
break;
}
// Don't fall-back during tree printing. The caller will handle
// this case.
if (TDT.PrintTree)
return;
// Attempting to do a template diff on non-templates. Set the variables
// and continue with regular type printing of the appropriate type.
Val = TDT.PrintFromType ? TDT.FromType : TDT.ToType;
Modifier = StringRef();
Argument = StringRef();
// Fall through
LLVM_FALLTHROUGH;
}
case DiagnosticsEngine::ak_qualtype: {
assert(Modifier.empty() && Argument.empty() &&
"Invalid modifier for QualType argument");
QualType Ty(QualType::getFromOpaquePtr(reinterpret_cast<void*>(Val)));
OS << ConvertTypeToDiagnosticString(Context, Ty, PrevArgs, QualTypeVals);
NeedQuotes = false;
break;
}
case DiagnosticsEngine::ak_declarationname: {
if (Modifier == "objcclass" && Argument.empty())
OS << '+';
else if (Modifier == "objcinstance" && Argument.empty())
OS << '-';
else
assert(Modifier.empty() && Argument.empty() &&
"Invalid modifier for DeclarationName argument");
OS << DeclarationName::getFromOpaqueInteger(Val);
break;
}
case DiagnosticsEngine::ak_nameddecl: {
bool Qualified;
if (Modifier == "q" && Argument.empty())
Qualified = true;
else {
assert(Modifier.empty() && Argument.empty() &&
"Invalid modifier for NamedDecl* argument");
Qualified = false;
}
const NamedDecl *ND = reinterpret_cast<const NamedDecl*>(Val);
ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), Qualified);
break;
}
case DiagnosticsEngine::ak_nestednamespec: {
NestedNameSpecifier *NNS = reinterpret_cast<NestedNameSpecifier*>(Val);
NNS->print(OS, Context.getPrintingPolicy());
NeedQuotes = false;
break;
}
case DiagnosticsEngine::ak_declcontext: {
DeclContext *DC = reinterpret_cast<DeclContext *> (Val);
assert(DC && "Should never have a null declaration context");
NeedQuotes = false;
// FIXME: Get the strings for DeclContext from some localized place
if (DC->isTranslationUnit()) {
if (Context.getLangOpts().CPlusPlus)
OS << "the global namespace";
else
OS << "the global scope";
} else if (DC->isClosure()) {
OS << "block literal";
} else if (isLambdaCallOperator(DC)) {
OS << "lambda expression";
} else if (TypeDecl *Type = dyn_cast<TypeDecl>(DC)) {
OS << ConvertTypeToDiagnosticString(Context,
Context.getTypeDeclType(Type),
PrevArgs, QualTypeVals);
} else {
assert(isa<NamedDecl>(DC) && "Expected a NamedDecl");
NamedDecl *ND = cast<NamedDecl>(DC);
if (isa<NamespaceDecl>(ND))
OS << "namespace ";
else if (isa<ObjCMethodDecl>(ND))
OS << "method ";
else if (isa<FunctionDecl>(ND))
OS << "function ";
OS << '\'';
ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
OS << '\'';
}
break;
}
case DiagnosticsEngine::ak_attr: {
const Attr *At = reinterpret_cast<Attr *>(Val);
assert(At && "Received null Attr object!");
OS << '\'' << At->getSpelling() << '\'';
NeedQuotes = false;
break;
}
}
if (NeedQuotes) {
Output.insert(Output.begin()+OldEnd, '\'');
Output.push_back('\'');
}
}
/// TemplateDiff - A class that constructs a pretty string for a pair of
/// QualTypes. For the pair of types, a diff tree will be created containing
/// all the information about the templates and template arguments. Afterwards,
/// the tree is transformed to a string according to the options passed in.
namespace {
class TemplateDiff {
/// Context - The ASTContext which is used for comparing template arguments.
ASTContext &Context;
/// Policy - Used during expression printing.
PrintingPolicy Policy;
/// ElideType - Option to elide identical types.
bool ElideType;
/// PrintTree - Format output string as a tree.
bool PrintTree;
/// ShowColor - Diagnostics support color, so bolding will be used.
bool ShowColor;
/// FromTemplateType - When single type printing is selected, this is the
/// type to be be printed. When tree printing is selected, this type will
/// show up first in the tree.
QualType FromTemplateType;
/// ToTemplateType - The type that FromType is compared to. Only in tree
/// printing will this type be outputed.
QualType ToTemplateType;
/// OS - The stream used to construct the output strings.
raw_ostream &OS;
/// IsBold - Keeps track of the bold formatting for the output string.
bool IsBold;
/// DiffTree - A tree representation the differences between two types.
class DiffTree {
public:
/// DiffKind - The difference in a DiffNode. Fields of
/// TemplateArgumentInfo needed by each difference can be found in the
/// Set* and Get* functions.
enum DiffKind {
/// Incomplete or invalid node.
Invalid,
/// Another level of templates
Template,
/// Type difference, all type differences except those falling under
/// the Template difference.
Type,
/// Expression difference, this is only when both arguments are
/// expressions. If one argument is an expression and the other is
/// Integer or Declaration, then use that diff type instead.
Expression,
/// Template argument difference
TemplateTemplate,
/// Integer difference
Integer,
/// Declaration difference, nullptr arguments are included here
Declaration,
/// One argument being integer and the other being declaration
FromIntegerAndToDeclaration,
FromDeclarationAndToInteger
};
private:
/// TemplateArgumentInfo - All the information needed to pretty print
/// a template argument. See the Set* and Get* functions to see which
/// fields are used for each DiffKind.
struct TemplateArgumentInfo {
QualType ArgType;
Qualifiers Qual;
llvm::APSInt Val;
bool IsValidInt = false;
Expr *ArgExpr = nullptr;
TemplateDecl *TD = nullptr;
ValueDecl *VD = nullptr;
bool NeedAddressOf = false;
bool IsNullPtr = false;
bool IsDefault = false;
};
/// DiffNode - The root node stores the original type. Each child node
/// stores template arguments of their parents. For templated types, the
/// template decl is also stored.
struct DiffNode {
DiffKind Kind = Invalid;
/// NextNode - The index of the next sibling node or 0.
unsigned NextNode = 0;
/// ChildNode - The index of the first child node or 0.
unsigned ChildNode = 0;
/// ParentNode - The index of the parent node.
unsigned ParentNode = 0;
TemplateArgumentInfo FromArgInfo, ToArgInfo;
/// Same - Whether the two arguments evaluate to the same value.
bool Same = false;
DiffNode(unsigned ParentNode = 0) : ParentNode(ParentNode) {}
};
/// FlatTree - A flattened tree used to store the DiffNodes.
SmallVector<DiffNode, 16> FlatTree;
/// CurrentNode - The index of the current node being used.
unsigned CurrentNode;
/// NextFreeNode - The index of the next unused node. Used when creating
/// child nodes.
unsigned NextFreeNode;
/// ReadNode - The index of the current node being read.
unsigned ReadNode;
public:
DiffTree() : CurrentNode(0), NextFreeNode(1), ReadNode(0) {
FlatTree.push_back(DiffNode());
}
// Node writing functions, one for each valid DiffKind element.
void SetTemplateDiff(TemplateDecl *FromTD, TemplateDecl *ToTD,
Qualifiers FromQual, Qualifiers ToQual,
bool FromDefault, bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = Template;
FlatTree[CurrentNode].FromArgInfo.TD = FromTD;
FlatTree[CurrentNode].ToArgInfo.TD = ToTD;
FlatTree[CurrentNode].FromArgInfo.Qual = FromQual;
FlatTree[CurrentNode].ToArgInfo.Qual = ToQual;
SetDefault(FromDefault, ToDefault);
}
void SetTypeDiff(QualType FromType, QualType ToType, bool FromDefault,
bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = Type;
FlatTree[CurrentNode].FromArgInfo.ArgType = FromType;
FlatTree[CurrentNode].ToArgInfo.ArgType = ToType;
SetDefault(FromDefault, ToDefault);
}
void SetExpressionDiff(Expr *FromExpr, Expr *ToExpr, bool FromDefault,
bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = Expression;
FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
SetDefault(FromDefault, ToDefault);
}
void SetTemplateTemplateDiff(TemplateDecl *FromTD, TemplateDecl *ToTD,
bool FromDefault, bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = TemplateTemplate;
FlatTree[CurrentNode].FromArgInfo.TD = FromTD;
FlatTree[CurrentNode].ToArgInfo.TD = ToTD;
SetDefault(FromDefault, ToDefault);
}
void SetIntegerDiff(const llvm::APSInt &FromInt, const llvm::APSInt &ToInt,
bool IsValidFromInt, bool IsValidToInt,
QualType FromIntType, QualType ToIntType,
Expr *FromExpr, Expr *ToExpr, bool FromDefault,
bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = Integer;
FlatTree[CurrentNode].FromArgInfo.Val = FromInt;
FlatTree[CurrentNode].ToArgInfo.Val = ToInt;
FlatTree[CurrentNode].FromArgInfo.IsValidInt = IsValidFromInt;
FlatTree[CurrentNode].ToArgInfo.IsValidInt = IsValidToInt;
FlatTree[CurrentNode].FromArgInfo.ArgType = FromIntType;
FlatTree[CurrentNode].ToArgInfo.ArgType = ToIntType;
FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
SetDefault(FromDefault, ToDefault);
}
void SetDeclarationDiff(ValueDecl *FromValueDecl, ValueDecl *ToValueDecl,
bool FromAddressOf, bool ToAddressOf,
bool FromNullPtr, bool ToNullPtr, Expr *FromExpr,
Expr *ToExpr, bool FromDefault, bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = Declaration;
FlatTree[CurrentNode].FromArgInfo.VD = FromValueDecl;
FlatTree[CurrentNode].ToArgInfo.VD = ToValueDecl;
FlatTree[CurrentNode].FromArgInfo.NeedAddressOf = FromAddressOf;
FlatTree[CurrentNode].ToArgInfo.NeedAddressOf = ToAddressOf;
FlatTree[CurrentNode].FromArgInfo.IsNullPtr = FromNullPtr;
FlatTree[CurrentNode].ToArgInfo.IsNullPtr = ToNullPtr;
FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
SetDefault(FromDefault, ToDefault);
}
void SetFromDeclarationAndToIntegerDiff(
ValueDecl *FromValueDecl, bool FromAddressOf, bool FromNullPtr,
Expr *FromExpr, const llvm::APSInt &ToInt, bool IsValidToInt,
QualType ToIntType, Expr *ToExpr, bool FromDefault, bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = FromDeclarationAndToInteger;
FlatTree[CurrentNode].FromArgInfo.VD = FromValueDecl;
FlatTree[CurrentNode].FromArgInfo.NeedAddressOf = FromAddressOf;
FlatTree[CurrentNode].FromArgInfo.IsNullPtr = FromNullPtr;
FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
FlatTree[CurrentNode].ToArgInfo.Val = ToInt;
FlatTree[CurrentNode].ToArgInfo.IsValidInt = IsValidToInt;
FlatTree[CurrentNode].ToArgInfo.ArgType = ToIntType;
FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
SetDefault(FromDefault, ToDefault);
}
void SetFromIntegerAndToDeclarationDiff(
const llvm::APSInt &FromInt, bool IsValidFromInt, QualType FromIntType,
Expr *FromExpr, ValueDecl *ToValueDecl, bool ToAddressOf,
bool ToNullPtr, Expr *ToExpr, bool FromDefault, bool ToDefault) {
assert(FlatTree[CurrentNode].Kind == Invalid && "Node is not empty.");
FlatTree[CurrentNode].Kind = FromIntegerAndToDeclaration;
FlatTree[CurrentNode].FromArgInfo.Val = FromInt;
FlatTree[CurrentNode].FromArgInfo.IsValidInt = IsValidFromInt;
FlatTree[CurrentNode].FromArgInfo.ArgType = FromIntType;
FlatTree[CurrentNode].FromArgInfo.ArgExpr = FromExpr;
FlatTree[CurrentNode].ToArgInfo.VD = ToValueDecl;
FlatTree[CurrentNode].ToArgInfo.NeedAddressOf = ToAddressOf;
FlatTree[CurrentNode].ToArgInfo.IsNullPtr = ToNullPtr;
FlatTree[CurrentNode].ToArgInfo.ArgExpr = ToExpr;
SetDefault(FromDefault, ToDefault);
}
/// SetDefault - Sets FromDefault and ToDefault flags of the current node.
void SetDefault(bool FromDefault, bool ToDefault) {
assert((!FromDefault || !ToDefault) && "Both arguments cannot be default.");
FlatTree[CurrentNode].FromArgInfo.IsDefault = FromDefault;
FlatTree[CurrentNode].ToArgInfo.IsDefault = ToDefault;
}
/// SetSame - Sets the same flag of the current node.
void SetSame(bool Same) {
FlatTree[CurrentNode].Same = Same;
}
/// SetKind - Sets the current node's type.
void SetKind(DiffKind Kind) {
FlatTree[CurrentNode].Kind = Kind;
}
/// Up - Changes the node to the parent of the current node.
void Up() {
assert(FlatTree[CurrentNode].Kind != Invalid &&
"Cannot exit node before setting node information.");
CurrentNode = FlatTree[CurrentNode].ParentNode;
}
/// AddNode - Adds a child node to the current node, then sets that node
/// node as the current node.
void AddNode() {
assert(FlatTree[CurrentNode].Kind == Template &&
"Only Template nodes can have children nodes.");
FlatTree.push_back(DiffNode(CurrentNode));
DiffNode &Node = FlatTree[CurrentNode];
if (Node.ChildNode == 0) {
// If a child node doesn't exist, add one.
Node.ChildNode = NextFreeNode;
} else {
// If a child node exists, find the last child node and add a
// next node to it.
unsigned i;
for (i = Node.ChildNode; FlatTree[i].NextNode != 0;
i = FlatTree[i].NextNode) {
}
FlatTree[i].NextNode = NextFreeNode;
}
CurrentNode = NextFreeNode;
++NextFreeNode;
}
// Node reading functions.
/// StartTraverse - Prepares the tree for recursive traversal.
void StartTraverse() {
ReadNode = 0;
CurrentNode = NextFreeNode;
NextFreeNode = 0;
}
/// Parent - Move the current read node to its parent.
void Parent() {
ReadNode = FlatTree[ReadNode].ParentNode;
}
void GetTemplateDiff(TemplateDecl *&FromTD, TemplateDecl *&ToTD,
Qualifiers &FromQual, Qualifiers &ToQual) {
assert(FlatTree[ReadNode].Kind == Template && "Unexpected kind.");
FromTD = FlatTree[ReadNode].FromArgInfo.TD;
ToTD = FlatTree[ReadNode].ToArgInfo.TD;
FromQual = FlatTree[ReadNode].FromArgInfo.Qual;
ToQual = FlatTree[ReadNode].ToArgInfo.Qual;
}
void GetTypeDiff(QualType &FromType, QualType &ToType) {
assert(FlatTree[ReadNode].Kind == Type && "Unexpected kind");
FromType = FlatTree[ReadNode].FromArgInfo.ArgType;
ToType = FlatTree[ReadNode].ToArgInfo.ArgType;
}
void GetExpressionDiff(Expr *&FromExpr, Expr *&ToExpr) {
assert(FlatTree[ReadNode].Kind == Expression && "Unexpected kind");
FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
}
void GetTemplateTemplateDiff(TemplateDecl *&FromTD, TemplateDecl *&ToTD) {
assert(FlatTree[ReadNode].Kind == TemplateTemplate && "Unexpected kind.");
FromTD = FlatTree[ReadNode].FromArgInfo.TD;
ToTD = FlatTree[ReadNode].ToArgInfo.TD;
}
void GetIntegerDiff(llvm::APSInt &FromInt, llvm::APSInt &ToInt,
bool &IsValidFromInt, bool &IsValidToInt,
QualType &FromIntType, QualType &ToIntType,
Expr *&FromExpr, Expr *&ToExpr) {
assert(FlatTree[ReadNode].Kind == Integer && "Unexpected kind.");
FromInt = FlatTree[ReadNode].FromArgInfo.Val;
ToInt = FlatTree[ReadNode].ToArgInfo.Val;
IsValidFromInt = FlatTree[ReadNode].FromArgInfo.IsValidInt;
IsValidToInt = FlatTree[ReadNode].ToArgInfo.IsValidInt;
FromIntType = FlatTree[ReadNode].FromArgInfo.ArgType;
ToIntType = FlatTree[ReadNode].ToArgInfo.ArgType;
FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
}
void GetDeclarationDiff(ValueDecl *&FromValueDecl, ValueDecl *&ToValueDecl,
bool &FromAddressOf, bool &ToAddressOf,
bool &FromNullPtr, bool &ToNullPtr, Expr *&FromExpr,
Expr *&ToExpr) {
assert(FlatTree[ReadNode].Kind == Declaration && "Unexpected kind.");
FromValueDecl = FlatTree[ReadNode].FromArgInfo.VD;
ToValueDecl = FlatTree[ReadNode].ToArgInfo.VD;
FromAddressOf = FlatTree[ReadNode].FromArgInfo.NeedAddressOf;
ToAddressOf = FlatTree[ReadNode].ToArgInfo.NeedAddressOf;
FromNullPtr = FlatTree[ReadNode].FromArgInfo.IsNullPtr;
ToNullPtr = FlatTree[ReadNode].ToArgInfo.IsNullPtr;
FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
}
void GetFromDeclarationAndToIntegerDiff(
ValueDecl *&FromValueDecl, bool &FromAddressOf, bool &FromNullPtr,
Expr *&FromExpr, llvm::APSInt &ToInt, bool &IsValidToInt,
QualType &ToIntType, Expr *&ToExpr) {
assert(FlatTree[ReadNode].Kind == FromDeclarationAndToInteger &&
"Unexpected kind.");
FromValueDecl = FlatTree[ReadNode].FromArgInfo.VD;
FromAddressOf = FlatTree[ReadNode].FromArgInfo.NeedAddressOf;
FromNullPtr = FlatTree[ReadNode].FromArgInfo.IsNullPtr;
FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
ToInt = FlatTree[ReadNode].ToArgInfo.Val;
IsValidToInt = FlatTree[ReadNode].ToArgInfo.IsValidInt;
ToIntType = FlatTree[ReadNode].ToArgInfo.ArgType;
ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
}
void GetFromIntegerAndToDeclarationDiff(
llvm::APSInt &FromInt, bool &IsValidFromInt, QualType &FromIntType,
Expr *&FromExpr, ValueDecl *&ToValueDecl, bool &ToAddressOf,
bool &ToNullPtr, Expr *&ToExpr) {
assert(FlatTree[ReadNode].Kind == FromIntegerAndToDeclaration &&
"Unexpected kind.");
FromInt = FlatTree[ReadNode].FromArgInfo.Val;
IsValidFromInt = FlatTree[ReadNode].FromArgInfo.IsValidInt;
FromIntType = FlatTree[ReadNode].FromArgInfo.ArgType;
FromExpr = FlatTree[ReadNode].FromArgInfo.ArgExpr;
ToValueDecl = FlatTree[ReadNode].ToArgInfo.VD;
ToAddressOf = FlatTree[ReadNode].ToArgInfo.NeedAddressOf;
ToNullPtr = FlatTree[ReadNode].ToArgInfo.IsNullPtr;
ToExpr = FlatTree[ReadNode].ToArgInfo.ArgExpr;
}
/// FromDefault - Return true if the from argument is the default.
bool FromDefault() {
return FlatTree[ReadNode].FromArgInfo.IsDefault;
}
/// ToDefault - Return true if the to argument is the default.
bool ToDefault() {
return FlatTree[ReadNode].ToArgInfo.IsDefault;
}
/// NodeIsSame - Returns true the arguments are the same.
bool NodeIsSame() {
return FlatTree[ReadNode].Same;
}
/// HasChildrend - Returns true if the node has children.
bool HasChildren() {
return FlatTree[ReadNode].ChildNode != 0;
}
/// MoveToChild - Moves from the current node to its child.
void MoveToChild() {
ReadNode = FlatTree[ReadNode].ChildNode;
}
/// AdvanceSibling - If there is a next sibling, advance to it and return
/// true. Otherwise, return false.
bool AdvanceSibling() {
if (FlatTree[ReadNode].NextNode == 0)
return false;
ReadNode = FlatTree[ReadNode].NextNode;
return true;
}
/// HasNextSibling - Return true if the node has a next sibling.
bool HasNextSibling() {
return FlatTree[ReadNode].NextNode != 0;
}
/// Empty - Returns true if the tree has no information.
bool Empty() {
return GetKind() == Invalid;
}
/// GetKind - Returns the current node's type.
DiffKind GetKind() {
return FlatTree[ReadNode].Kind;
}
};
DiffTree Tree;
/// TSTiterator - a pair of iterators that walks the
/// TemplateSpecializationType and the desugared TemplateSpecializationType.
/// The deseguared TemplateArgument should provide the canonical argument
/// for comparisons.
class TSTiterator {
typedef const TemplateArgument& reference;
typedef const TemplateArgument* pointer;
/// InternalIterator - an iterator that is used to enter a
/// TemplateSpecializationType and read TemplateArguments inside template
/// parameter packs in order with the rest of the TemplateArguments.
struct InternalIterator {
/// TST - the template specialization whose arguments this iterator
/// traverse over.
const TemplateSpecializationType *TST;
/// Index - the index of the template argument in TST.
unsigned Index;
/// CurrentTA - if CurrentTA is not the same as EndTA, then CurrentTA
/// points to a TemplateArgument within a parameter pack.
TemplateArgument::pack_iterator CurrentTA;
/// EndTA - the end iterator of a parameter pack
TemplateArgument::pack_iterator EndTA;
/// InternalIterator - Constructs an iterator and sets it to the first
/// template argument.
InternalIterator(const TemplateSpecializationType *TST)
: TST(TST), Index(0), CurrentTA(nullptr), EndTA(nullptr) {
if (!TST) return;
if (isEnd()) return;
// Set to first template argument. If not a parameter pack, done.
TemplateArgument TA = TST->getArg(0);
if (TA.getKind() != TemplateArgument::Pack) return;
// Start looking into the parameter pack.
CurrentTA = TA.pack_begin();
EndTA = TA.pack_end();
// Found a valid template argument.
if (CurrentTA != EndTA) return;
// Parameter pack is empty, use the increment to get to a valid
// template argument.
++(*this);
}
/// Return true if the iterator is non-singular.
bool isValid() const { return TST; }
/// isEnd - Returns true if the iterator is one past the end.
bool isEnd() const {
assert(TST && "InternalIterator is invalid with a null TST.");
return Index >= TST->getNumArgs();
}
/// &operator++ - Increment the iterator to the next template argument.
InternalIterator &operator++() {
assert(TST && "InternalIterator is invalid with a null TST.");
if (isEnd()) {
return *this;
}
// If in a parameter pack, advance in the parameter pack.
if (CurrentTA != EndTA) {
++CurrentTA;
if (CurrentTA != EndTA)
return *this;
}
// Loop until a template argument is found, or the end is reached.
while (true) {
// Advance to the next template argument. Break if reached the end.
if (++Index == TST->getNumArgs())
break;