forked from OSchip/llvm-project
492 lines
14 KiB
C++
492 lines
14 KiB
C++
//===--- TemplateBase.cpp - Common template AST class implementation ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements common classes used throughout C++ template
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// representations.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/TemplateBase.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclBase.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/Type.h"
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#include "clang/AST/TypeLoc.h"
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#include "clang/Basic/Diagnostic.h"
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#include "llvm/ADT/FoldingSet.h"
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#include <algorithm>
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#include <cctype>
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using namespace clang;
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/// \brief Print a template integral argument value.
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///
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/// \param TemplArg the TemplateArgument instance to print.
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///
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/// \param Out the raw_ostream instance to use for printing.
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static void printIntegral(const TemplateArgument &TemplArg,
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llvm::raw_ostream &Out) {
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const ::clang::Type *T = TemplArg.getIntegralType().getTypePtr();
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const llvm::APSInt *Val = TemplArg.getAsIntegral();
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if (T->isBooleanType()) {
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Out << (Val->getBoolValue() ? "true" : "false");
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} else if (T->isCharType()) {
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const unsigned char Ch = Val->getZExtValue();
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const std::string Str(1, Ch);
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Out << ((Ch == '\'') ? "'\\" : "'");
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Out.write_escaped(Str, /*UseHexEscapes=*/ true);
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Out << "'";
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} else {
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Out << Val->toString(10);
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}
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}
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//===----------------------------------------------------------------------===//
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// TemplateArgument Implementation
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//===----------------------------------------------------------------------===//
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TemplateArgument TemplateArgument::CreatePackCopy(ASTContext &Context,
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const TemplateArgument *Args,
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unsigned NumArgs) {
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if (NumArgs == 0)
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return TemplateArgument(0, 0);
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TemplateArgument *Storage = new (Context) TemplateArgument [NumArgs];
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std::copy(Args, Args + NumArgs, Storage);
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return TemplateArgument(Storage, NumArgs);
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}
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bool TemplateArgument::isDependent() const {
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switch (getKind()) {
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case Null:
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assert(false && "Should not have a NULL template argument");
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return false;
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case Type:
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return getAsType()->isDependentType();
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case Template:
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return getAsTemplate().isDependent();
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case TemplateExpansion:
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return true;
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case Declaration:
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if (DeclContext *DC = dyn_cast<DeclContext>(getAsDecl()))
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return DC->isDependentContext();
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return getAsDecl()->getDeclContext()->isDependentContext();
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case Integral:
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// Never dependent
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return false;
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case Expression:
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return (getAsExpr()->isTypeDependent() || getAsExpr()->isValueDependent());
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case Pack:
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for (pack_iterator P = pack_begin(), PEnd = pack_end(); P != PEnd; ++P) {
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if (P->isDependent())
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return true;
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}
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return false;
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}
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return false;
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}
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bool TemplateArgument::isPackExpansion() const {
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switch (getKind()) {
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case Null:
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case Declaration:
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case Integral:
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case Pack:
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case Template:
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return false;
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case TemplateExpansion:
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return true;
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case Type:
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return isa<PackExpansionType>(getAsType());
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case Expression:
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return isa<PackExpansionExpr>(getAsExpr());
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}
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return false;
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}
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bool TemplateArgument::containsUnexpandedParameterPack() const {
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switch (getKind()) {
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case Null:
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case Declaration:
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case Integral:
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case TemplateExpansion:
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break;
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case Type:
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if (getAsType()->containsUnexpandedParameterPack())
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return true;
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break;
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case Template:
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if (getAsTemplate().containsUnexpandedParameterPack())
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return true;
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break;
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case Expression:
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if (getAsExpr()->containsUnexpandedParameterPack())
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return true;
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break;
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case Pack:
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for (pack_iterator P = pack_begin(), PEnd = pack_end(); P != PEnd; ++P)
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if (P->containsUnexpandedParameterPack())
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return true;
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break;
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}
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return false;
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}
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llvm::Optional<unsigned> TemplateArgument::getNumTemplateExpansions() const {
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assert(Kind == TemplateExpansion);
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if (TemplateArg.NumExpansions)
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return TemplateArg.NumExpansions - 1;
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return llvm::Optional<unsigned>();
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}
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void TemplateArgument::Profile(llvm::FoldingSetNodeID &ID,
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const ASTContext &Context) const {
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ID.AddInteger(Kind);
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switch (Kind) {
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case Null:
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break;
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case Type:
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getAsType().Profile(ID);
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break;
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case Declaration:
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ID.AddPointer(getAsDecl()? getAsDecl()->getCanonicalDecl() : 0);
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break;
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case Template:
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case TemplateExpansion: {
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TemplateName Template = getAsTemplateOrTemplatePattern();
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if (TemplateTemplateParmDecl *TTP
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= dyn_cast_or_null<TemplateTemplateParmDecl>(
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Template.getAsTemplateDecl())) {
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ID.AddBoolean(true);
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ID.AddInteger(TTP->getDepth());
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ID.AddInteger(TTP->getPosition());
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ID.AddBoolean(TTP->isParameterPack());
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} else {
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ID.AddBoolean(false);
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ID.AddPointer(Context.getCanonicalTemplateName(Template)
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.getAsVoidPointer());
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}
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break;
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}
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case Integral:
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getAsIntegral()->Profile(ID);
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getIntegralType().Profile(ID);
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break;
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case Expression:
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getAsExpr()->Profile(ID, Context, true);
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break;
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case Pack:
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ID.AddInteger(Args.NumArgs);
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for (unsigned I = 0; I != Args.NumArgs; ++I)
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Args.Args[I].Profile(ID, Context);
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}
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}
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bool TemplateArgument::structurallyEquals(const TemplateArgument &Other) const {
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if (getKind() != Other.getKind()) return false;
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switch (getKind()) {
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case Null:
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case Type:
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case Declaration:
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case Expression:
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case Template:
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case TemplateExpansion:
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return TypeOrValue == Other.TypeOrValue;
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case Integral:
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return getIntegralType() == Other.getIntegralType() &&
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*getAsIntegral() == *Other.getAsIntegral();
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case Pack:
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if (Args.NumArgs != Other.Args.NumArgs) return false;
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for (unsigned I = 0, E = Args.NumArgs; I != E; ++I)
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if (!Args.Args[I].structurallyEquals(Other.Args.Args[I]))
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return false;
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return true;
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}
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// Suppress warnings.
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return false;
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}
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TemplateArgument TemplateArgument::getPackExpansionPattern() const {
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assert(isPackExpansion());
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switch (getKind()) {
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case Type:
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return getAsType()->getAs<PackExpansionType>()->getPattern();
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case Expression:
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return cast<PackExpansionExpr>(getAsExpr())->getPattern();
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case TemplateExpansion:
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return TemplateArgument(getAsTemplateOrTemplatePattern());
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case Declaration:
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case Integral:
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case Pack:
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case Null:
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case Template:
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return TemplateArgument();
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}
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return TemplateArgument();
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}
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void TemplateArgument::print(const PrintingPolicy &Policy,
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llvm::raw_ostream &Out) const {
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switch (getKind()) {
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case Null:
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Out << "<no value>";
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break;
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case Type: {
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std::string TypeStr;
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getAsType().getAsStringInternal(TypeStr, Policy);
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Out << TypeStr;
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break;
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}
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case Declaration: {
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bool Unnamed = true;
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if (NamedDecl *ND = dyn_cast_or_null<NamedDecl>(getAsDecl())) {
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if (ND->getDeclName()) {
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Unnamed = false;
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Out << ND->getNameAsString();
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}
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}
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if (Unnamed) {
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Out << "<anonymous>";
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}
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break;
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}
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case Template:
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getAsTemplate().print(Out, Policy);
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break;
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case TemplateExpansion:
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getAsTemplateOrTemplatePattern().print(Out, Policy);
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Out << "...";
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break;
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case Integral: {
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printIntegral(*this, Out);
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break;
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}
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case Expression:
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getAsExpr()->printPretty(Out, 0, Policy);
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break;
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case Pack:
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Out << "<";
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bool First = true;
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for (TemplateArgument::pack_iterator P = pack_begin(), PEnd = pack_end();
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P != PEnd; ++P) {
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if (First)
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First = false;
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else
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Out << ", ";
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P->print(Policy, Out);
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}
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Out << ">";
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break;
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}
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}
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//===----------------------------------------------------------------------===//
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// TemplateArgumentLoc Implementation
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//===----------------------------------------------------------------------===//
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TemplateArgumentLocInfo::TemplateArgumentLocInfo() {
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memset(this, 0, sizeof(TemplateArgumentLocInfo));
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}
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SourceRange TemplateArgumentLoc::getSourceRange() const {
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switch (Argument.getKind()) {
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case TemplateArgument::Expression:
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return getSourceExpression()->getSourceRange();
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case TemplateArgument::Declaration:
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return getSourceDeclExpression()->getSourceRange();
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case TemplateArgument::Type:
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if (TypeSourceInfo *TSI = getTypeSourceInfo())
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return TSI->getTypeLoc().getSourceRange();
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else
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return SourceRange();
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case TemplateArgument::Template:
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if (getTemplateQualifierLoc())
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return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
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getTemplateNameLoc());
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return SourceRange(getTemplateNameLoc());
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case TemplateArgument::TemplateExpansion:
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if (getTemplateQualifierLoc())
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return SourceRange(getTemplateQualifierLoc().getBeginLoc(),
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getTemplateEllipsisLoc());
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return SourceRange(getTemplateNameLoc(), getTemplateEllipsisLoc());
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case TemplateArgument::Integral:
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case TemplateArgument::Pack:
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case TemplateArgument::Null:
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return SourceRange();
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}
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// Silence bonus gcc warning.
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return SourceRange();
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}
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TemplateArgumentLoc
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TemplateArgumentLoc::getPackExpansionPattern(SourceLocation &Ellipsis,
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llvm::Optional<unsigned> &NumExpansions,
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ASTContext &Context) const {
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assert(Argument.isPackExpansion());
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switch (Argument.getKind()) {
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case TemplateArgument::Type: {
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// FIXME: We shouldn't ever have to worry about missing
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// type-source info!
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TypeSourceInfo *ExpansionTSInfo = getTypeSourceInfo();
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if (!ExpansionTSInfo)
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ExpansionTSInfo = Context.getTrivialTypeSourceInfo(
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getArgument().getAsType(),
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Ellipsis);
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PackExpansionTypeLoc Expansion
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= cast<PackExpansionTypeLoc>(ExpansionTSInfo->getTypeLoc());
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Ellipsis = Expansion.getEllipsisLoc();
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TypeLoc Pattern = Expansion.getPatternLoc();
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NumExpansions = Expansion.getTypePtr()->getNumExpansions();
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// FIXME: This is horrible. We know where the source location data is for
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// the pattern, and we have the pattern's type, but we are forced to copy
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// them into an ASTContext because TypeSourceInfo bundles them together
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// and TemplateArgumentLoc traffics in TypeSourceInfo pointers.
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TypeSourceInfo *PatternTSInfo
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= Context.CreateTypeSourceInfo(Pattern.getType(),
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Pattern.getFullDataSize());
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memcpy(PatternTSInfo->getTypeLoc().getOpaqueData(),
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Pattern.getOpaqueData(), Pattern.getFullDataSize());
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return TemplateArgumentLoc(TemplateArgument(Pattern.getType()),
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PatternTSInfo);
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}
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case TemplateArgument::Expression: {
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PackExpansionExpr *Expansion
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= cast<PackExpansionExpr>(Argument.getAsExpr());
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Expr *Pattern = Expansion->getPattern();
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Ellipsis = Expansion->getEllipsisLoc();
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NumExpansions = Expansion->getNumExpansions();
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return TemplateArgumentLoc(Pattern, Pattern);
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}
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case TemplateArgument::TemplateExpansion:
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Ellipsis = getTemplateEllipsisLoc();
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NumExpansions = Argument.getNumTemplateExpansions();
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return TemplateArgumentLoc(Argument.getPackExpansionPattern(),
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getTemplateQualifierLoc(),
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getTemplateNameLoc());
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case TemplateArgument::Declaration:
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case TemplateArgument::Template:
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case TemplateArgument::Integral:
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case TemplateArgument::Pack:
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case TemplateArgument::Null:
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return TemplateArgumentLoc();
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}
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return TemplateArgumentLoc();
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}
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const DiagnosticBuilder &clang::operator<<(const DiagnosticBuilder &DB,
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const TemplateArgument &Arg) {
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switch (Arg.getKind()) {
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case TemplateArgument::Null:
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// This is bad, but not as bad as crashing because of argument
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// count mismatches.
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return DB << "(null template argument)";
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case TemplateArgument::Type:
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return DB << Arg.getAsType();
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case TemplateArgument::Declaration:
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return DB << Arg.getAsDecl();
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case TemplateArgument::Integral:
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return DB << Arg.getAsIntegral()->toString(10);
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case TemplateArgument::Template:
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return DB << Arg.getAsTemplate();
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case TemplateArgument::TemplateExpansion:
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return DB << Arg.getAsTemplateOrTemplatePattern() << "...";
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case TemplateArgument::Expression: {
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// This shouldn't actually ever happen, so it's okay that we're
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// regurgitating an expression here.
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// FIXME: We're guessing at LangOptions!
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llvm::SmallString<32> Str;
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llvm::raw_svector_ostream OS(Str);
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LangOptions LangOpts;
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LangOpts.CPlusPlus = true;
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PrintingPolicy Policy(LangOpts);
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Arg.getAsExpr()->printPretty(OS, 0, Policy);
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return DB << OS.str();
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}
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case TemplateArgument::Pack: {
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// FIXME: We're guessing at LangOptions!
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llvm::SmallString<32> Str;
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llvm::raw_svector_ostream OS(Str);
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LangOptions LangOpts;
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LangOpts.CPlusPlus = true;
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PrintingPolicy Policy(LangOpts);
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Arg.print(Policy, OS);
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return DB << OS.str();
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}
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}
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return DB;
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}
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