AST/StmtDumper.cpp

//===--- StmtDumper.cpp - Dumping implementation for Stmt ASTs ------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Stmt::dump/Stmt::print methods, which dump out the
// AST in a form that exposes type details and other fields.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/StmtVisitor.h"
#include "clang/AST/Decl.h"
#include "clang/AST/ExprCXX.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/Support/Compiler.h"
#include <cstdio>
using namespace clang;

//===----------------------------------------------------------------------===//
// StmtDumper Visitor
//===----------------------------------------------------------------------===//

namespace  {
  class VISIBILITY_HIDDEN StmtDumper : public StmtVisitor<StmtDumper> {
    SourceManager *SM;
    FILE *F;
    unsigned IndentLevel;
    
    /// MaxDepth - When doing a normal dump (not dumpAll) we only want to dump
    /// the first few levels of an AST.  This keeps track of how many ast levels
    /// are left.
    unsigned MaxDepth;
    
    /// LastLocFilename/LastLocLine - Keep track of the last location we print
    /// out so that we can print out deltas from then on out.
    const char *LastLocFilename;
    unsigned LastLocLine;
  public:
    StmtDumper(SourceManager *sm, FILE *f, unsigned maxDepth)
      : SM(sm), F(f), IndentLevel(0-1), MaxDepth(maxDepth) {
      LastLocFilename = "";
      LastLocLine = ~0U;
    }
    
    void DumpSubTree(Stmt *S) {
      // Prune the recursion if not using dump all.
      if (MaxDepth == 0) return;
      
      ++IndentLevel;
      if (S) {
        Visit(S);
        
        // Print out children.
        Stmt::child_iterator CI = S->child_begin(), CE = S->child_end();
        if (CI != CE) {
          while (CI != CE) {
            fprintf(F, "\n");
            DumpSubTree(*CI++);
          }
        }
        fprintf(F, ")");
      } else {
        Indent();
        fprintf(F, "<<<NULL>>>");
      }
      --IndentLevel;
    }
    
    void DumpDeclarator(Decl *D);
    
    void Indent() const {
      for (int i = 0, e = IndentLevel; i < e; ++i)
        fprintf(F, "  ");
    }
    
    void DumpType(QualType T) {
      fprintf(F, "'%s'", T.getAsString().c_str());

      // If the type is directly a typedef, strip off typedefness to give at
      // least one level of concreteness.
      if (TypedefType *TDT = dyn_cast<TypedefType>(T))
        fprintf(F, ":'%s'", TDT->LookThroughTypedefs().getAsString().c_str());
    }
    void DumpStmt(const Stmt *Node) {
      Indent();
      fprintf(F, "(%s %p", Node->getStmtClassName(), (void*)Node);
      DumpSourceRange(Node);
    }
    void DumpExpr(const Expr *Node) {
      DumpStmt(Node);
      fprintf(F, " ");
      DumpType(Node->getType());
    }
    void DumpSourceRange(const Stmt *Node);
    void DumpLocation(SourceLocation Loc);
    
    // Stmts.
    void VisitStmt(Stmt *Node);
    void VisitDeclStmt(DeclStmt *Node);
    void VisitLabelStmt(LabelStmt *Node);
    void VisitGotoStmt(GotoStmt *Node);
    
    // Exprs
    void VisitExpr(Expr *Node);
    void VisitDeclRefExpr(DeclRefExpr *Node);
    void VisitPreDefinedExpr(PreDefinedExpr *Node);
    void VisitCharacterLiteral(CharacterLiteral *Node);
    void VisitIntegerLiteral(IntegerLiteral *Node);
    void VisitFloatingLiteral(FloatingLiteral *Node);
    void VisitStringLiteral(StringLiteral *Str);
    void VisitUnaryOperator(UnaryOperator *Node);
    void VisitSizeOfAlignOfTypeExpr(SizeOfAlignOfTypeExpr *Node);
    void VisitMemberExpr(MemberExpr *Node);
    void VisitOCUVectorElementExpr(OCUVectorElementExpr *Node);
    void VisitBinaryOperator(BinaryOperator *Node);
    void VisitCompoundAssignOperator(CompoundAssignOperator *Node);
    void VisitAddrLabelExpr(AddrLabelExpr *Node);
    void VisitTypesCompatibleExpr(TypesCompatibleExpr *Node);

    // C++
    void VisitCXXCastExpr(CXXCastExpr *Node);
    void VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node);

    // ObjC
    void VisitObjCEncodeExpr(ObjCEncodeExpr *Node);
  };
}

//===----------------------------------------------------------------------===//
//  Utilities
//===----------------------------------------------------------------------===//

void StmtDumper::DumpLocation(SourceLocation Loc) {
  SourceLocation PhysLoc = SM->getPhysicalLoc(Loc);

  // The general format we print out is filename:line:col, but we drop pieces
  // that haven't changed since the last loc printed.
  const char *Filename = SM->getSourceName(PhysLoc);
  unsigned LineNo = SM->getLineNumber(PhysLoc);
  if (strcmp(Filename, LastLocFilename) != 0) {
    fprintf(stderr, "%s:%u:%u", Filename, LineNo, SM->getColumnNumber(PhysLoc));
    LastLocFilename = Filename;
    LastLocLine = LineNo;
  } else if (LineNo != LastLocLine) {
    fprintf(stderr, "line:%u:%u", LineNo, SM->getColumnNumber(PhysLoc));
    LastLocLine = LineNo;
  } else {
    fprintf(stderr, "col:%u", SM->getColumnNumber(PhysLoc));
  }
}

void StmtDumper::DumpSourceRange(const Stmt *Node) {
  // Can't translate locations if a SourceManager isn't available.
  if (SM == 0) return;
  
  // TODO: If the parent expression is available, we can print a delta vs its
  // location.
  SourceRange R = Node->getSourceRange();
  
  fprintf(stderr, " <");
  DumpLocation(R.Begin());
  if (R.Begin() != R.End()) {
    fprintf(stderr, ", ");
    DumpLocation(R.End());
  }
  fprintf(stderr, ">");
    
  // <t2.c:123:421[blah], t2.c:412:321>

}


//===----------------------------------------------------------------------===//
//  Stmt printing methods.
//===----------------------------------------------------------------------===//

void StmtDumper::VisitStmt(Stmt *Node) {
  DumpStmt(Node);
}

void StmtDumper::DumpDeclarator(Decl *D) {
  // FIXME: Need to complete/beautify this... this code simply shows the
  // nodes are where they need to be.
  if (TypedefDecl *localType = dyn_cast<TypedefDecl>(D)) {
    fprintf(F, "\"typedef %s %s\"",
            localType->getUnderlyingType().getAsString().c_str(),
            localType->getName());
  } else if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
    fprintf(F, "\"");
    // Emit storage class for vardecls.
    if (VarDecl *V = dyn_cast<VarDecl>(VD)) {
      switch (V->getStorageClass()) {
      default: assert(0 && "Unknown storage class!");
      case VarDecl::None:     break;
      case VarDecl::Extern:   fprintf(F, "extern "); break;
      case VarDecl::Static:   fprintf(F, "static "); break; 
      case VarDecl::Auto:     fprintf(F, "auto "); break;
      case VarDecl::Register: fprintf(F, "register "); break;
      }
    }
    
    std::string Name = VD->getName();
    VD->getType().getAsStringInternal(Name);
    fprintf(F, "%s", Name.c_str());
    
    // If this is a vardecl with an initializer, emit it.
    if (VarDecl *V = dyn_cast<VarDecl>(VD)) {
      if (V->getInit()) {
        fprintf(F, " =\n");
        DumpSubTree(V->getInit());
      }
    }
    fprintf(F, "\"");
  } else {
    // FIXME: "struct x;"
    assert(0 && "Unexpected decl");
  }
}

void StmtDumper::VisitDeclStmt(DeclStmt *Node) {
  DumpStmt(Node);
  fprintf(F, "\n");
  for (ScopedDecl *D = Node->getDecl(); D; D = D->getNextDeclarator()) {
    ++IndentLevel;
    Indent();
    fprintf(F, "%p ", (void*)D);
    DumpDeclarator(D);
    if (D->getNextDeclarator())
      fprintf(F, "\n");
    --IndentLevel;
  }
}

void StmtDumper::VisitLabelStmt(LabelStmt *Node) {
  DumpStmt(Node);
  fprintf(F, " '%s'\n", Node->getName());
}

void StmtDumper::VisitGotoStmt(GotoStmt *Node) {
  DumpStmt(Node);
  fprintf(F, " '%s':%p", Node->getLabel()->getName(), (void*)Node->getLabel());
}

//===----------------------------------------------------------------------===//
//  Expr printing methods.
//===----------------------------------------------------------------------===//

void StmtDumper::VisitExpr(Expr *Node) {
  DumpExpr(Node);
}

void StmtDumper::VisitDeclRefExpr(DeclRefExpr *Node) {
  DumpExpr(Node);

  fprintf(F, " ");
  switch (Node->getDecl()->getKind()) {
    case Decl::Function: fprintf(F,"FunctionDecl"); break;
    case Decl::BlockVar: fprintf(F,"BlockVar"); break;
    case Decl::FileVar: fprintf(F,"FileVar"); break;
    case Decl::ParmVar: fprintf(F,"ParmVar"); break;
    case Decl::EnumConstant: fprintf(F,"EnumConstant"); break;
    case Decl::Typedef: fprintf(F,"Typedef"); break;
    case Decl::Struct: fprintf(F,"Struct"); break;
    case Decl::Union: fprintf(F,"Union"); break;
    case Decl::Class: fprintf(F,"Class"); break;
    case Decl::Enum: fprintf(F,"Enum"); break;
    case Decl::ObjcInterface: fprintf(F,"ObjcInterface"); break;
    case Decl::ObjcClass: fprintf(F,"ObjcClass"); break;
    default: fprintf(F,"Decl"); break;
  }
  
  fprintf(F, "='%s' %p", Node->getDecl()->getName(), (void*)Node->getDecl());
}

void StmtDumper::VisitPreDefinedExpr(PreDefinedExpr *Node) {
  DumpExpr(Node);
  switch (Node->getIdentType()) {
  default:
    assert(0 && "unknown case");
  case PreDefinedExpr::Func:
    fprintf(F, " __func__");
    break;
  case PreDefinedExpr::Function:
    fprintf(F, " __FUNCTION__");
    break;
  case PreDefinedExpr::PrettyFunction:
    fprintf(F, " __PRETTY_FUNCTION__");
    break;
  }
}

void StmtDumper::VisitCharacterLiteral(CharacterLiteral *Node) {
  DumpExpr(Node);
  fprintf(F, " %d", Node->getValue());
}

void StmtDumper::VisitIntegerLiteral(IntegerLiteral *Node) {
  DumpExpr(Node);

  bool isSigned = Node->getType()->isSignedIntegerType();
  fprintf(F, " %s", Node->getValue().toString(10, isSigned).c_str());
}
void StmtDumper::VisitFloatingLiteral(FloatingLiteral *Node) {
  DumpExpr(Node);
  fprintf(F, " %f", Node->getValueAsDouble());
}

void StmtDumper::VisitStringLiteral(StringLiteral *Str) {
  DumpExpr(Str);
  // FIXME: this doesn't print wstrings right.
  fprintf(F, " %s\"", Str->isWide() ? "L" : "");

  for (unsigned i = 0, e = Str->getByteLength(); i != e; ++i) {
    switch (char C = Str->getStrData()[i]) {
    default:
      if (isprint(C))
        fputc(C, F); 
      else
        fprintf(F, "\\%03o", C);
      break;
    // Handle some common ones to make dumps prettier.
    case '\\': fprintf(F, "\\\\"); break;
    case '"':  fprintf(F, "\\\""); break;
    case '\n': fprintf(F, "\\n"); break;
    case '\t': fprintf(F, "\\t"); break;
    case '\a': fprintf(F, "\\a"); break;
    case '\b': fprintf(F, "\\b"); break;
    }
  }
  fprintf(F, "\"");
}

void StmtDumper::VisitUnaryOperator(UnaryOperator *Node) {
  DumpExpr(Node);
  fprintf(F, " %s '%s'", Node->isPostfix() ? "postfix" : "prefix",
          UnaryOperator::getOpcodeStr(Node->getOpcode()));
}
void StmtDumper::VisitSizeOfAlignOfTypeExpr(SizeOfAlignOfTypeExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " %s ", Node->isSizeOf() ? "sizeof" : "alignof");
  DumpType(Node->getArgumentType());
}

void StmtDumper::VisitMemberExpr(MemberExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " %s%s %p", Node->isArrow() ? "->" : ".",
          Node->getMemberDecl()->getName(), (void*)Node->getMemberDecl());
}
void StmtDumper::VisitOCUVectorElementExpr(OCUVectorElementExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " %s", Node->getAccessor().getName());
}
void StmtDumper::VisitBinaryOperator(BinaryOperator *Node) {
  DumpExpr(Node);
  fprintf(F, " '%s'", BinaryOperator::getOpcodeStr(Node->getOpcode()));
}
void StmtDumper::VisitCompoundAssignOperator(CompoundAssignOperator *Node) {
  DumpExpr(Node);
  fprintf(F, " '%s' ComputeTy=",
          BinaryOperator::getOpcodeStr(Node->getOpcode()));
  DumpType(Node->getComputationType());
}

// GNU extensions.

void StmtDumper::VisitAddrLabelExpr(AddrLabelExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " %s %p", Node->getLabel()->getName(), (void*)Node->getLabel());
}

void StmtDumper::VisitTypesCompatibleExpr(TypesCompatibleExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " ");
  DumpType(Node->getArgType1());
  fprintf(F, " ");
  DumpType(Node->getArgType2());
}

//===----------------------------------------------------------------------===//
// C++ Expressions
//===----------------------------------------------------------------------===//

void StmtDumper::VisitCXXCastExpr(CXXCastExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " %s", CXXCastExpr::getOpcodeStr(Node->getOpcode()));
}

void StmtDumper::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node) {
  DumpExpr(Node);
  fprintf(F, " %s", Node->getValue() ? "true" : "false");
}

//===----------------------------------------------------------------------===//
// Obj-C Expressions
//===----------------------------------------------------------------------===//

void StmtDumper::VisitObjCEncodeExpr(ObjCEncodeExpr *Node) {
  DumpExpr(Node);
 
  fprintf(F, " ");
  DumpType(Node->getEncodedType());
}

//===----------------------------------------------------------------------===//
// Stmt method implementations
//===----------------------------------------------------------------------===//

/// dump - This does a local dump of the specified AST fragment.  It dumps the
/// specified node and a few nodes underneath it, but not the whole subtree.
/// This is useful in a debugger.
void Stmt::dump(SourceManager &SM) const {
  StmtDumper P(&SM, stderr, 4);
  P.DumpSubTree(const_cast<Stmt*>(this));
  fprintf(stderr, "\n");
}

/// dump - This does a local dump of the specified AST fragment.  It dumps the
/// specified node and a few nodes underneath it, but not the whole subtree.
/// This is useful in a debugger.
void Stmt::dump() const {
  StmtDumper P(0, stderr, 4);
  P.DumpSubTree(const_cast<Stmt*>(this));
  fprintf(stderr, "\n");
}

/// dumpAll - This does a dump of the specified AST fragment and all subtrees.
void Stmt::dumpAll(SourceManager &SM) const {
  StmtDumper P(&SM, stderr, ~0U);
  P.DumpSubTree(const_cast<Stmt*>(this));
  fprintf(stderr, "\n");
}

/// dumpAll - This does a dump of the specified AST fragment and all subtrees.
void Stmt::dumpAll() const {
  StmtDumper P(0, stderr, ~0U);
  P.DumpSubTree(const_cast<Stmt*>(this));
  fprintf(stderr, "\n");
}