llvm-project/clang/lib/Frontend/ASTConsumers.cpp

//===--- ASTConsumers.cpp - ASTConsumer implementations -------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// AST Consumer Implementations.
//
//===----------------------------------------------------------------------===//

#include "clang/Frontend/ASTConsumers.h"
#include "clang/Frontend/DocumentXML.h"
#include "clang/Frontend/PathDiagnosticClients.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/FileManager.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/PrettyPrinter.h"
#include "clang/CodeGen/ModuleBuilder.h"
#include "llvm/Module.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include <cstdio>

using namespace clang;

//===----------------------------------------------------------------------===//
/// ASTPrinter - Pretty-printer and dumper of ASTs

namespace {
  class ASTPrinter : public ASTConsumer {
    llvm::raw_ostream &Out;
    bool Dump;

  public:
    ASTPrinter(llvm::raw_ostream* o = NULL, bool Dump = false)
      : Out(o? *o : llvm::errs()), Dump(Dump) { }

    virtual void HandleTranslationUnit(ASTContext &Context) {
      PrintingPolicy Policy = Context.PrintingPolicy;
      Policy.Dump = Dump;
      Context.getTranslationUnitDecl()->print(Out, Policy);
    }
  };
} // end anonymous namespace

ASTConsumer *clang::CreateASTPrinter(llvm::raw_ostream* out) {
  return new ASTPrinter(out);
}

//===----------------------------------------------------------------------===//
/// ASTPrinterXML - XML-printer of ASTs

namespace {
  class ASTPrinterXML : public ASTConsumer {
    DocumentXML         Doc;

  public:
    ASTPrinterXML(llvm::raw_ostream& o) : Doc("CLANG_XML", o) {}

    void Initialize(ASTContext &Context) {
      Doc.initialize(Context);
    }

    virtual void HandleTranslationUnit(ASTContext &Ctx) {
      Doc.addSubNode("TranslationUnit");
      for (DeclContext::decl_iterator
             D = Ctx.getTranslationUnitDecl()->decls_begin(),
             DEnd = Ctx.getTranslationUnitDecl()->decls_end();
           D != DEnd;
           ++D)
        Doc.PrintDecl(*D);
      Doc.toParent();
      Doc.finalize();
    }
  };
} // end anonymous namespace


ASTConsumer *clang::CreateASTPrinterXML(llvm::raw_ostream* out) {
  return new ASTPrinterXML(out ? *out : llvm::outs());
}

ASTConsumer *clang::CreateASTDumper() {
  return new ASTPrinter(0, true);
}

//===----------------------------------------------------------------------===//
/// ASTViewer - AST Visualization

namespace {
  class ASTViewer : public ASTConsumer {
    ASTContext *Context;
  public:
    void Initialize(ASTContext &Context) {
      this->Context = &Context;
    }

    virtual void HandleTopLevelDecl(DeclGroupRef D) {
      for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I)
        HandleTopLevelSingleDecl(*I);
    }

    void HandleTopLevelSingleDecl(Decl *D);
  };
}

void ASTViewer::HandleTopLevelSingleDecl(Decl *D) {
  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
    FD->print(llvm::errs());

    if (Stmt *Body = FD->getBody()) {
      llvm::errs() << '\n';
      Body->viewAST();
      llvm::errs() << '\n';
    }
    return;
  }

  if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
    MD->print(llvm::errs());

    if (MD->getBody()) {
      llvm::errs() << '\n';
      MD->getBody()->viewAST();
      llvm::errs() << '\n';
    }
  }
}


ASTConsumer *clang::CreateASTViewer() { return new ASTViewer(); }

//===----------------------------------------------------------------------===//
/// DeclContextPrinter - Decl and DeclContext Visualization

namespace {

class DeclContextPrinter : public ASTConsumer {
  llvm::raw_ostream& Out;
public:
  DeclContextPrinter() : Out(llvm::errs()) {}

  void HandleTranslationUnit(ASTContext &C) {
    PrintDeclContext(C.getTranslationUnitDecl(), 4);
  }

  void PrintDeclContext(const DeclContext* DC, unsigned Indentation);
};
}  // end anonymous namespace

void DeclContextPrinter::PrintDeclContext(const DeclContext* DC,
                                          unsigned Indentation) {
  // Print DeclContext name.
  switch (DC->getDeclKind()) {
  case Decl::TranslationUnit:
    Out << "[translation unit] " << DC;
    break;
  case Decl::Namespace: {
    Out << "[namespace] ";
    const NamespaceDecl* ND = cast<NamespaceDecl>(DC);
    Out << ND->getNameAsString();
    break;
  }
  case Decl::Enum: {
    const EnumDecl* ED = cast<EnumDecl>(DC);
    if (ED->isDefinition())
      Out << "[enum] ";
    else
      Out << "<enum> ";
    Out << ED->getNameAsString();
    break;
  }
  case Decl::Record: {
    const RecordDecl* RD = cast<RecordDecl>(DC);
    if (RD->isDefinition())
      Out << "[struct] ";
    else
      Out << "<struct> ";
    Out << RD->getNameAsString();
    break;
  }
  case Decl::CXXRecord: {
    const CXXRecordDecl* RD = cast<CXXRecordDecl>(DC);
    if (RD->isDefinition())
      Out << "[class] ";
    else
      Out << "<class> ";
    Out << RD->getNameAsString() << " " << DC;
    break;
  }
  case Decl::ObjCMethod:
    Out << "[objc method]";
    break;
  case Decl::ObjCInterface:
    Out << "[objc interface]";
    break;
  case Decl::ObjCCategory:
    Out << "[objc category]";
    break;
  case Decl::ObjCProtocol:
    Out << "[objc protocol]";
    break;
  case Decl::ObjCImplementation:
    Out << "[objc implementation]";
    break;
  case Decl::ObjCCategoryImpl:
    Out << "[objc categoryimpl]";
    break;
  case Decl::LinkageSpec:
    Out << "[linkage spec]";
    break;
  case Decl::Block:
    Out << "[block]";
    break;
  case Decl::Function: {
    const FunctionDecl* FD = cast<FunctionDecl>(DC);
    if (FD->isThisDeclarationADefinition())
      Out << "[function] ";
    else
      Out << "<function> ";
    Out << FD->getNameAsString();
    // Print the parameters.
    Out << "(";
    bool PrintComma = false;
    for (FunctionDecl::param_const_iterator I = FD->param_begin(),
           E = FD->param_end(); I != E; ++I) {
      if (PrintComma)
        Out << ", ";
      else
        PrintComma = true;
      Out << (*I)->getNameAsString();
    }
    Out << ")";
    break;
  }
  case Decl::CXXMethod: {
    const CXXMethodDecl* D = cast<CXXMethodDecl>(DC);
    if (D->isOutOfLine())
      Out << "[c++ method] ";
    else if (D->isImplicit())
      Out << "(c++ method) ";
    else
      Out << "<c++ method> ";
    Out << D->getNameAsString();
    // Print the parameters.
    Out << "(";
    bool PrintComma = false;
    for (FunctionDecl::param_const_iterator I = D->param_begin(),
           E = D->param_end(); I != E; ++I) {
      if (PrintComma)
        Out << ", ";
      else
        PrintComma = true;
      Out << (*I)->getNameAsString();
    }
    Out << ")";

    // Check the semantic DeclContext.
    const DeclContext* SemaDC = D->getDeclContext();
    const DeclContext* LexicalDC = D->getLexicalDeclContext();
    if (SemaDC != LexicalDC)
      Out << " [[" << SemaDC << "]]";

    break;
  }
  case Decl::CXXConstructor: {
    const CXXConstructorDecl* D = cast<CXXConstructorDecl>(DC);
    if (D->isOutOfLine())
      Out << "[c++ ctor] ";
    else if (D->isImplicit())
      Out << "(c++ ctor) ";
    else
      Out << "<c++ ctor> ";
    Out << D->getNameAsString();
    // Print the parameters.
    Out << "(";
    bool PrintComma = false;
    for (FunctionDecl::param_const_iterator I = D->param_begin(),
           E = D->param_end(); I != E; ++I) {
      if (PrintComma)
        Out << ", ";
      else
        PrintComma = true;
      Out << (*I)->getNameAsString();
    }
    Out << ")";

    // Check the semantic DC.
    const DeclContext* SemaDC = D->getDeclContext();
    const DeclContext* LexicalDC = D->getLexicalDeclContext();
    if (SemaDC != LexicalDC)
      Out << " [[" << SemaDC << "]]";
    break;
  }
  case Decl::CXXDestructor: {
    const CXXDestructorDecl* D = cast<CXXDestructorDecl>(DC);
    if (D->isOutOfLine())
      Out << "[c++ dtor] ";
    else if (D->isImplicit())
      Out << "(c++ dtor) ";
    else
      Out << "<c++ dtor> ";
    Out << D->getNameAsString();
    // Check the semantic DC.
    const DeclContext* SemaDC = D->getDeclContext();
    const DeclContext* LexicalDC = D->getLexicalDeclContext();
    if (SemaDC != LexicalDC)
      Out << " [[" << SemaDC << "]]";
    break;
  }
  case Decl::CXXConversion: {
    const CXXConversionDecl* D = cast<CXXConversionDecl>(DC);
    if (D->isOutOfLine())
      Out << "[c++ conversion] ";
    else if (D->isImplicit())
      Out << "(c++ conversion) ";
    else
      Out << "<c++ conversion> ";
    Out << D->getNameAsString();
    // Check the semantic DC.
    const DeclContext* SemaDC = D->getDeclContext();
    const DeclContext* LexicalDC = D->getLexicalDeclContext();
    if (SemaDC != LexicalDC)
      Out << " [[" << SemaDC << "]]";
    break;
  }

  default:
    assert(0 && "a decl that inherits DeclContext isn't handled");
  }

  Out << "\n";

  // Print decls in the DeclContext.
  for (DeclContext::decl_iterator I = DC->decls_begin(), E = DC->decls_end();
       I != E; ++I) {
    for (unsigned i = 0; i < Indentation; ++i)
      Out << "  ";

    Decl::Kind DK = I->getKind();
    switch (DK) {
    case Decl::Namespace:
    case Decl::Enum:
    case Decl::Record:
    case Decl::CXXRecord:
    case Decl::ObjCMethod:
    case Decl::ObjCInterface:
    case Decl::ObjCCategory:
    case Decl::ObjCProtocol:
    case Decl::ObjCImplementation:
    case Decl::ObjCCategoryImpl:
    case Decl::LinkageSpec:
    case Decl::Block:
    case Decl::Function:
    case Decl::CXXMethod:
    case Decl::CXXConstructor:
    case Decl::CXXDestructor:
    case Decl::CXXConversion:
    {
      DeclContext* DC = cast<DeclContext>(*I);
      PrintDeclContext(DC, Indentation+2);
      break;
    }
    case Decl::Field: {
      FieldDecl* FD = cast<FieldDecl>(*I);
      Out << "<field> " << FD->getNameAsString() << "\n";
      break;
    }
    case Decl::Typedef: {
      TypedefDecl* TD = cast<TypedefDecl>(*I);
      Out << "<typedef> " << TD->getNameAsString() << "\n";
      break;
    }
    case Decl::EnumConstant: {
      EnumConstantDecl* ECD = cast<EnumConstantDecl>(*I);
      Out << "<enum constant> " << ECD->getNameAsString() << "\n";
      break;
    }
    case Decl::Var: {
      VarDecl* VD = cast<VarDecl>(*I);
      Out << "<var> " << VD->getNameAsString() << "\n";
      break;
    }
    case Decl::ImplicitParam: {
      ImplicitParamDecl* IPD = cast<ImplicitParamDecl>(*I);
      Out << "<implicit parameter> " << IPD->getNameAsString() << "\n";
      break;
    }
    case Decl::ParmVar: {
      ParmVarDecl* PVD = cast<ParmVarDecl>(*I);
      Out << "<parameter> " << PVD->getNameAsString() << "\n";
      break;
    }
    case Decl::ObjCProperty: {
      ObjCPropertyDecl* OPD = cast<ObjCPropertyDecl>(*I);
      Out << "<objc property> " << OPD->getNameAsString() << "\n";
      break;
    }
    default:
      fprintf(stderr, "DeclKind: %d \"%s\"\n", DK, I->getDeclKindName());
      assert(0 && "decl unhandled");
    }
  }
}
ASTConsumer *clang::CreateDeclContextPrinter() {
  return new DeclContextPrinter();
}

//===----------------------------------------------------------------------===//
/// RecordLayoutDumper - C++ Record Layout Dumping.
namespace {
class RecordLayoutDumper : public ASTConsumer {
  llvm::raw_ostream& Out;
  
  void PrintOffset(uint64_t Offset, unsigned IndentLevel) {
    Out << llvm::format("%4d | ", Offset);
    for (unsigned I = 0; I < IndentLevel * 2; ++I) Out << ' ';
  }
  
  void DumpRecordLayoutOffsets(const CXXRecordDecl *RD, ASTContext &C,
                               uint64_t Offset,
                               unsigned IndentLevel, const char* Description,
                               bool IncludeVirtualBases) {
    const ASTRecordLayout &Info = C.getASTRecordLayout(RD);

    PrintOffset(Offset, IndentLevel);
    Out << C.getTypeDeclType((CXXRecordDecl *)RD).getAsString();
    if (Description)
      Out << ' ' << Description;
    if (RD->isEmpty())
      Out << " (empty)";
    Out << '\n';
    
    IndentLevel++;
    
    const CXXRecordDecl *PrimaryBase = Info.getPrimaryBase();
    
    // Vtable pointer.
    if (RD->isDynamicClass() && !PrimaryBase) {
      PrintOffset(Offset, IndentLevel);
      Out << '(' << RD->getNameAsString() << " vtable pointer)\n";
    }
    // Dump (non-virtual) bases
    for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
         E = RD->bases_end(); I != E; ++I) {
      assert(!I->getType()->isDependentType() &&
             "Cannot layout class with dependent bases.");
      if (I->isVirtual())
        continue;
      
      const CXXRecordDecl *Base =
        cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl());
      
      uint64_t BaseOffset = Offset + Info.getBaseClassOffset(Base) / 8;
      
      DumpRecordLayoutOffsets(Base, C, BaseOffset, IndentLevel, 
                              Base == PrimaryBase ? "(primary base)" : "(base)",
                              /*IncludeVirtualBases=*/false);
    }
    
    // Dump fields.
    uint64_t FieldNo = 0;
    for (CXXRecordDecl::field_iterator I = RD->field_begin(),
         E = RD->field_end(); I != E; ++I, ++FieldNo) {      
      const FieldDecl *Field = *I;
      uint64_t FieldOffset = Offset + Info.getFieldOffset(FieldNo) / 8;
      
      if (const RecordType *RT = Field->getType()->getAs<RecordType>()) {
        if (const CXXRecordDecl *D = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
          DumpRecordLayoutOffsets(D, C, FieldOffset, IndentLevel, 
                                  Field->getNameAsCString(),
                                  /*IncludeVirtualBases=*/true);
          continue;
        }
      }
      
      PrintOffset(FieldOffset, IndentLevel);
      Out << Field->getType().getAsString() << ' ';
      Out << Field->getNameAsString() << '\n';
    }
    
    if (!IncludeVirtualBases)
      return;
    
    // Dump virtual bases.
    for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(),
         E = RD->vbases_end(); I != E; ++I) {
      assert(I->isVirtual() && "Found non-virtual class!");
      const CXXRecordDecl *VBase =
        cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl());
      
      uint64_t VBaseOffset = Offset + Info.getVBaseClassOffset(VBase) / 8;
      DumpRecordLayoutOffsets(VBase, C, VBaseOffset, IndentLevel, 
                              VBase == PrimaryBase ? 
                              "(primary virtual base)" : "(virtual base)",
                              /*IncludeVirtualBases=*/false);
    }
  }
  
  // FIXME: Maybe this could be useful in ASTContext.cpp.
  void DumpRecordLayout(const CXXRecordDecl *RD, ASTContext &C) {
    const ASTRecordLayout &Info = C.getASTRecordLayout(RD);
    
    DumpRecordLayoutOffsets(RD, C, 0, 0, 0, 
                            /*IncludeVirtualBases=*/true);
    Out << "  sizeof=" << Info.getSize() / 8;
    Out << ", dsize=" << Info.getDataSize() / 8;
    Out << ", align=" << Info.getAlignment() / 8 << '\n';
    Out << "  nvsize=" << Info.getNonVirtualSize() / 8;
    Out << ", nvalign=" << Info.getNonVirtualAlign() / 8 << '\n';
    Out << '\n';
  }
  
public:
  RecordLayoutDumper() : Out(llvm::errs()) {}
  
  void HandleTranslationUnit(ASTContext &C) {
    for (ASTContext::type_iterator I = C.types_begin(), E = C.types_end(); 
         I != E; ++I) {
      const RecordType *RT = dyn_cast<RecordType>(*I);
      if (!RT)
        continue;
      
      const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl());
      if (!RD)
        continue;
      
      if (RD->isImplicit())
        continue;

      if (RD->isDependentType())
        continue;
      
      if (RD->isInvalidDecl())
        continue;
      
      if (!RD->getDefinition(C))
        continue;
      
      // FIXME: Do we really need to hard code this?
      if (RD->getQualifiedNameAsString() == "__va_list_tag")
        continue;
      
      DumpRecordLayout(RD, C);
   }
  }
};
} // end anonymous namespace
ASTConsumer *clang::CreateRecordLayoutDumper() {
  return new RecordLayoutDumper();
}

//===----------------------------------------------------------------------===//
/// InheritanceViewer - C++ Inheritance Visualization

namespace {
class InheritanceViewer : public ASTConsumer {
  const std::string clsname;
public:
  InheritanceViewer(const std::string& cname) : clsname(cname) {}

  void HandleTranslationUnit(ASTContext &C) {
    for (ASTContext::type_iterator I=C.types_begin(),E=C.types_end(); I!=E; ++I)
      if (RecordType *T = dyn_cast<RecordType>(*I)) {
        if (CXXRecordDecl *D = dyn_cast<CXXRecordDecl>(T->getDecl())) {
          // FIXME: This lookup needs to be generalized to handle namespaces and
          // (when we support them) templates.
          if (D->getNameAsString() == clsname) {
            D->viewInheritance(C);
          }
        }
      }
  }
};
}

ASTConsumer *clang::CreateInheritanceViewer(const std::string& clsname) {
  return new InheritanceViewer(clsname);
}