aoqi@0: /*
vromero@2709:  * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.javac.jvm;
aoqi@0: 
aoqi@0: import java.util.*;
aoqi@0: 
shshahma@3371: import com.sun.tools.javac.tree.TreeInfo.PosKind;
aoqi@0: import com.sun.tools.javac.util.*;
aoqi@0: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
aoqi@0: import com.sun.tools.javac.util.List;
aoqi@0: import com.sun.tools.javac.code.*;
aoqi@0: import com.sun.tools.javac.code.Attribute.TypeCompound;
aoqi@0: import com.sun.tools.javac.code.Symbol.VarSymbol;
aoqi@0: import com.sun.tools.javac.comp.*;
aoqi@0: import com.sun.tools.javac.tree.*;
aoqi@0: 
aoqi@0: import com.sun.tools.javac.code.Symbol.*;
aoqi@0: import com.sun.tools.javac.code.Type.*;
aoqi@0: import com.sun.tools.javac.jvm.Code.*;
aoqi@0: import com.sun.tools.javac.jvm.Items.*;
aoqi@0: import com.sun.tools.javac.tree.EndPosTable;
aoqi@0: import com.sun.tools.javac.tree.JCTree.*;
aoqi@0: 
aoqi@0: import static com.sun.tools.javac.code.Flags.*;
aoqi@0: import static com.sun.tools.javac.code.Kinds.*;
aoqi@0: import static com.sun.tools.javac.code.TypeTag.*;
aoqi@0: import static com.sun.tools.javac.jvm.ByteCodes.*;
aoqi@0: import static com.sun.tools.javac.jvm.CRTFlags.*;
aoqi@0: import static com.sun.tools.javac.main.Option.*;
aoqi@0: import static com.sun.tools.javac.tree.JCTree.Tag.*;
aoqi@0: 
aoqi@0: /** This pass maps flat Java (i.e. without inner classes) to bytecodes.
aoqi@0:  *
aoqi@0:  *  <p><b>This is NOT part of any supported API.
aoqi@0:  *  If you write code that depends on this, you do so at your own risk.
aoqi@0:  *  This code and its internal interfaces are subject to change or
aoqi@0:  *  deletion without notice.</b>
aoqi@0:  */
aoqi@0: public class Gen extends JCTree.Visitor {
aoqi@0:     protected static final Context.Key<Gen> genKey =
aoqi@0:         new Context.Key<Gen>();
aoqi@0: 
aoqi@0:     private final Log log;
aoqi@0:     private final Symtab syms;
aoqi@0:     private final Check chk;
aoqi@0:     private final Resolve rs;
aoqi@0:     private final TreeMaker make;
aoqi@0:     private final Names names;
aoqi@0:     private final Target target;
aoqi@0:     private final Type stringBufferType;
aoqi@0:     private final Map<Type,Symbol> stringBufferAppend;
aoqi@0:     private Name accessDollar;
aoqi@0:     private final Types types;
aoqi@0:     private final Lower lower;
vromero@2566:     private final Flow flow;
aoqi@0: 
aoqi@0:     /** Switch: GJ mode?
aoqi@0:      */
aoqi@0:     private final boolean allowGenerics;
aoqi@0: 
aoqi@0:     /** Set when Miranda method stubs are to be generated. */
aoqi@0:     private final boolean generateIproxies;
aoqi@0: 
aoqi@0:     /** Format of stackmap tables to be generated. */
aoqi@0:     private final Code.StackMapFormat stackMap;
aoqi@0: 
aoqi@0:     /** A type that serves as the expected type for all method expressions.
aoqi@0:      */
aoqi@0:     private final Type methodType;
aoqi@0: 
aoqi@0:     public static Gen instance(Context context) {
aoqi@0:         Gen instance = context.get(genKey);
aoqi@0:         if (instance == null)
aoqi@0:             instance = new Gen(context);
aoqi@0:         return instance;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Constant pool, reset by genClass.
aoqi@0:      */
aoqi@0:     private Pool pool;
aoqi@0: 
aoqi@0:     private final boolean typeAnnoAsserts;
aoqi@0: 
aoqi@0:     protected Gen(Context context) {
aoqi@0:         context.put(genKey, this);
aoqi@0: 
aoqi@0:         names = Names.instance(context);
aoqi@0:         log = Log.instance(context);
aoqi@0:         syms = Symtab.instance(context);
aoqi@0:         chk = Check.instance(context);
aoqi@0:         rs = Resolve.instance(context);
aoqi@0:         make = TreeMaker.instance(context);
aoqi@0:         target = Target.instance(context);
aoqi@0:         types = Types.instance(context);
aoqi@0:         methodType = new MethodType(null, null, null, syms.methodClass);
aoqi@0:         allowGenerics = Source.instance(context).allowGenerics();
aoqi@0:         stringBufferType = target.useStringBuilder()
aoqi@0:             ? syms.stringBuilderType
aoqi@0:             : syms.stringBufferType;
aoqi@0:         stringBufferAppend = new HashMap<Type,Symbol>();
aoqi@0:         accessDollar = names.
aoqi@0:             fromString("access" + target.syntheticNameChar());
vromero@2566:         flow = Flow.instance(context);
aoqi@0:         lower = Lower.instance(context);
aoqi@0: 
aoqi@0:         Options options = Options.instance(context);
aoqi@0:         lineDebugInfo =
aoqi@0:             options.isUnset(G_CUSTOM) ||
aoqi@0:             options.isSet(G_CUSTOM, "lines");
aoqi@0:         varDebugInfo =
aoqi@0:             options.isUnset(G_CUSTOM)
aoqi@0:             ? options.isSet(G)
aoqi@0:             : options.isSet(G_CUSTOM, "vars");
aoqi@0:         genCrt = options.isSet(XJCOV);
aoqi@0:         debugCode = options.isSet("debugcode");
aoqi@0:         allowInvokedynamic = target.hasInvokedynamic() || options.isSet("invokedynamic");
aoqi@0:         pool = new Pool(types);
aoqi@0:         typeAnnoAsserts = options.isSet("TypeAnnotationAsserts");
aoqi@0: 
aoqi@0:         generateIproxies =
aoqi@0:             target.requiresIproxy() ||
aoqi@0:             options.isSet("miranda");
aoqi@0: 
aoqi@0:         if (target.generateStackMapTable()) {
aoqi@0:             // ignore cldc because we cannot have both stackmap formats
aoqi@0:             this.stackMap = StackMapFormat.JSR202;
aoqi@0:         } else {
aoqi@0:             if (target.generateCLDCStackmap()) {
aoqi@0:                 this.stackMap = StackMapFormat.CLDC;
aoqi@0:             } else {
aoqi@0:                 this.stackMap = StackMapFormat.NONE;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         // by default, avoid jsr's for simple finalizers
aoqi@0:         int setjsrlimit = 50;
aoqi@0:         String jsrlimitString = options.get("jsrlimit");
aoqi@0:         if (jsrlimitString != null) {
aoqi@0:             try {
aoqi@0:                 setjsrlimit = Integer.parseInt(jsrlimitString);
aoqi@0:             } catch (NumberFormatException ex) {
aoqi@0:                 // ignore ill-formed numbers for jsrlimit
aoqi@0:             }
aoqi@0:         }
aoqi@0:         this.jsrlimit = setjsrlimit;
aoqi@0:         this.useJsrLocally = false; // reset in visitTry
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Switches
aoqi@0:      */
aoqi@0:     private final boolean lineDebugInfo;
aoqi@0:     private final boolean varDebugInfo;
aoqi@0:     private final boolean genCrt;
aoqi@0:     private final boolean debugCode;
aoqi@0:     private final boolean allowInvokedynamic;
aoqi@0: 
aoqi@0:     /** Default limit of (approximate) size of finalizer to inline.
aoqi@0:      *  Zero means always use jsr.  100 or greater means never use
aoqi@0:      *  jsr.
aoqi@0:      */
aoqi@0:     private final int jsrlimit;
aoqi@0: 
aoqi@0:     /** True if jsr is used.
aoqi@0:      */
aoqi@0:     private boolean useJsrLocally;
aoqi@0: 
aoqi@0:     /** Code buffer, set by genMethod.
aoqi@0:      */
aoqi@0:     private Code code;
aoqi@0: 
aoqi@0:     /** Items structure, set by genMethod.
aoqi@0:      */
aoqi@0:     private Items items;
aoqi@0: 
aoqi@0:     /** Environment for symbol lookup, set by genClass
aoqi@0:      */
aoqi@0:     private Env<AttrContext> attrEnv;
aoqi@0: 
aoqi@0:     /** The top level tree.
aoqi@0:      */
aoqi@0:     private JCCompilationUnit toplevel;
aoqi@0: 
aoqi@0:     /** The number of code-gen errors in this class.
aoqi@0:      */
aoqi@0:     private int nerrs = 0;
aoqi@0: 
aoqi@0:     /** An object containing mappings of syntax trees to their
aoqi@0:      *  ending source positions.
aoqi@0:      */
aoqi@0:     EndPosTable endPosTable;
aoqi@0: 
aoqi@0:     /** Generate code to load an integer constant.
aoqi@0:      *  @param n     The integer to be loaded.
aoqi@0:      */
aoqi@0:     void loadIntConst(int n) {
aoqi@0:         items.makeImmediateItem(syms.intType, n).load();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** The opcode that loads a zero constant of a given type code.
aoqi@0:      *  @param tc   The given type code (@see ByteCode).
aoqi@0:      */
aoqi@0:     public static int zero(int tc) {
aoqi@0:         switch(tc) {
aoqi@0:         case INTcode: case BYTEcode: case SHORTcode: case CHARcode:
aoqi@0:             return iconst_0;
aoqi@0:         case LONGcode:
aoqi@0:             return lconst_0;
aoqi@0:         case FLOATcode:
aoqi@0:             return fconst_0;
aoqi@0:         case DOUBLEcode:
aoqi@0:             return dconst_0;
aoqi@0:         default:
aoqi@0:             throw new AssertionError("zero");
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** The opcode that loads a one constant of a given type code.
aoqi@0:      *  @param tc   The given type code (@see ByteCode).
aoqi@0:      */
aoqi@0:     public static int one(int tc) {
aoqi@0:         return zero(tc) + 1;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Generate code to load -1 of the given type code (either int or long).
aoqi@0:      *  @param tc   The given type code (@see ByteCode).
aoqi@0:      */
aoqi@0:     void emitMinusOne(int tc) {
aoqi@0:         if (tc == LONGcode) {
aoqi@0:             items.makeImmediateItem(syms.longType, new Long(-1)).load();
aoqi@0:         } else {
aoqi@0:             code.emitop0(iconst_m1);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Construct a symbol to reflect the qualifying type that should
aoqi@0:      *  appear in the byte code as per JLS 13.1.
aoqi@0:      *
aoqi@0:      *  For {@literal target >= 1.2}: Clone a method with the qualifier as owner (except
aoqi@0:      *  for those cases where we need to work around VM bugs).
aoqi@0:      *
aoqi@0:      *  For {@literal target <= 1.1}: If qualified variable or method is defined in a
aoqi@0:      *  non-accessible class, clone it with the qualifier class as owner.
aoqi@0:      *
aoqi@0:      *  @param sym    The accessed symbol
aoqi@0:      *  @param site   The qualifier's type.
aoqi@0:      */
aoqi@0:     Symbol binaryQualifier(Symbol sym, Type site) {
aoqi@0: 
aoqi@0:         if (site.hasTag(ARRAY)) {
aoqi@0:             if (sym == syms.lengthVar ||
aoqi@0:                 sym.owner != syms.arrayClass)
aoqi@0:                 return sym;
aoqi@0:             // array clone can be qualified by the array type in later targets
aoqi@0:             Symbol qualifier = target.arrayBinaryCompatibility()
aoqi@0:                 ? new ClassSymbol(Flags.PUBLIC, site.tsym.name,
aoqi@0:                                   site, syms.noSymbol)
aoqi@0:                 : syms.objectType.tsym;
aoqi@0:             return sym.clone(qualifier);
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (sym.owner == site.tsym ||
aoqi@0:             (sym.flags() & (STATIC | SYNTHETIC)) == (STATIC | SYNTHETIC)) {
aoqi@0:             return sym;
aoqi@0:         }
aoqi@0:         if (!target.obeyBinaryCompatibility())
aoqi@0:             return rs.isAccessible(attrEnv, (TypeSymbol)sym.owner)
aoqi@0:                 ? sym
aoqi@0:                 : sym.clone(site.tsym);
aoqi@0: 
aoqi@0:         if (!target.interfaceFieldsBinaryCompatibility()) {
aoqi@0:             if ((sym.owner.flags() & INTERFACE) != 0 && sym.kind == VAR)
aoqi@0:                 return sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         // leave alone methods inherited from Object
aoqi@0:         // JLS 13.1.
aoqi@0:         if (sym.owner == syms.objectType.tsym)
aoqi@0:             return sym;
aoqi@0: 
aoqi@0:         if (!target.interfaceObjectOverridesBinaryCompatibility()) {
aoqi@0:             if ((sym.owner.flags() & INTERFACE) != 0 &&
aoqi@0:                 syms.objectType.tsym.members().lookup(sym.name).scope != null)
aoqi@0:                 return sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         return sym.clone(site.tsym);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Insert a reference to given type in the constant pool,
aoqi@0:      *  checking for an array with too many dimensions;
aoqi@0:      *  return the reference's index.
aoqi@0:      *  @param type   The type for which a reference is inserted.
aoqi@0:      */
aoqi@0:     int makeRef(DiagnosticPosition pos, Type type) {
aoqi@0:         checkDimension(pos, type);
aoqi@0:         if (type.isAnnotated()) {
aoqi@0:             // Treat annotated types separately - we don't want
aoqi@0:             // to collapse all of them - at least for annotated
aoqi@0:             // exceptions.
aoqi@0:             // TODO: review this.
aoqi@0:             return pool.put((Object)type);
aoqi@0:         } else {
aoqi@0:             return pool.put(type.hasTag(CLASS) ? (Object)type.tsym : (Object)type);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Check if the given type is an array with too many dimensions.
aoqi@0:      */
aoqi@0:     private void checkDimension(DiagnosticPosition pos, Type t) {
aoqi@0:         switch (t.getTag()) {
aoqi@0:         case METHOD:
aoqi@0:             checkDimension(pos, t.getReturnType());
aoqi@0:             for (List<Type> args = t.getParameterTypes(); args.nonEmpty(); args = args.tail)
aoqi@0:                 checkDimension(pos, args.head);
aoqi@0:             break;
aoqi@0:         case ARRAY:
aoqi@0:             if (types.dimensions(t) > ClassFile.MAX_DIMENSIONS) {
aoqi@0:                 log.error(pos, "limit.dimensions");
aoqi@0:                 nerrs++;
aoqi@0:             }
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             break;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Create a tempory variable.
aoqi@0:      *  @param type   The variable's type.
aoqi@0:      */
aoqi@0:     LocalItem makeTemp(Type type) {
aoqi@0:         VarSymbol v = new VarSymbol(Flags.SYNTHETIC,
aoqi@0:                                     names.empty,
aoqi@0:                                     type,
aoqi@0:                                     env.enclMethod.sym);
aoqi@0:         code.newLocal(v);
aoqi@0:         return items.makeLocalItem(v);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Generate code to call a non-private method or constructor.
aoqi@0:      *  @param pos         Position to be used for error reporting.
aoqi@0:      *  @param site        The type of which the method is a member.
aoqi@0:      *  @param name        The method's name.
aoqi@0:      *  @param argtypes    The method's argument types.
aoqi@0:      *  @param isStatic    A flag that indicates whether we call a
aoqi@0:      *                     static or instance method.
aoqi@0:      */
aoqi@0:     void callMethod(DiagnosticPosition pos,
aoqi@0:                     Type site, Name name, List<Type> argtypes,
aoqi@0:                     boolean isStatic) {
aoqi@0:         Symbol msym = rs.
aoqi@0:             resolveInternalMethod(pos, attrEnv, site, name, argtypes, null);
aoqi@0:         if (isStatic) items.makeStaticItem(msym).invoke();
aoqi@0:         else items.makeMemberItem(msym, name == names.init).invoke();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Is the given method definition an access method
aoqi@0:      *  resulting from a qualified super? This is signified by an odd
aoqi@0:      *  access code.
aoqi@0:      */
aoqi@0:     private boolean isAccessSuper(JCMethodDecl enclMethod) {
aoqi@0:         return
aoqi@0:             (enclMethod.mods.flags & SYNTHETIC) != 0 &&
aoqi@0:             isOddAccessName(enclMethod.name);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Does given name start with "access$" and end in an odd digit?
aoqi@0:      */
aoqi@0:     private boolean isOddAccessName(Name name) {
aoqi@0:         return
aoqi@0:             name.startsWith(accessDollar) &&
aoqi@0:             (name.getByteAt(name.getByteLength() - 1) & 1) == 1;
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Non-local exits
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** Generate code to invoke the finalizer associated with given
aoqi@0:      *  environment.
aoqi@0:      *  Any calls to finalizers are appended to the environments `cont' chain.
aoqi@0:      *  Mark beginning of gap in catch all range for finalizer.
aoqi@0:      */
aoqi@0:     void genFinalizer(Env<GenContext> env) {
aoqi@0:         if (code.isAlive() && env.info.finalize != null)
aoqi@0:             env.info.finalize.gen();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Generate code to call all finalizers of structures aborted by
aoqi@0:      *  a non-local
aoqi@0:      *  exit.  Return target environment of the non-local exit.
aoqi@0:      *  @param target      The tree representing the structure that's aborted
aoqi@0:      *  @param env         The environment current at the non-local exit.
aoqi@0:      */
aoqi@0:     Env<GenContext> unwind(JCTree target, Env<GenContext> env) {
aoqi@0:         Env<GenContext> env1 = env;
aoqi@0:         while (true) {
aoqi@0:             genFinalizer(env1);
aoqi@0:             if (env1.tree == target) break;
aoqi@0:             env1 = env1.next;
aoqi@0:         }
aoqi@0:         return env1;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Mark end of gap in catch-all range for finalizer.
aoqi@0:      *  @param env   the environment which might contain the finalizer
aoqi@0:      *               (if it does, env.info.gaps != null).
aoqi@0:      */
aoqi@0:     void endFinalizerGap(Env<GenContext> env) {
aoqi@0:         if (env.info.gaps != null && env.info.gaps.length() % 2 == 1)
aoqi@0:             env.info.gaps.append(code.curCP());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Mark end of all gaps in catch-all ranges for finalizers of environments
aoqi@0:      *  lying between, and including to two environments.
aoqi@0:      *  @param from    the most deeply nested environment to mark
aoqi@0:      *  @param to      the least deeply nested environment to mark
aoqi@0:      */
aoqi@0:     void endFinalizerGaps(Env<GenContext> from, Env<GenContext> to) {
aoqi@0:         Env<GenContext> last = null;
aoqi@0:         while (last != to) {
aoqi@0:             endFinalizerGap(from);
aoqi@0:             last = from;
aoqi@0:             from = from.next;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Do any of the structures aborted by a non-local exit have
aoqi@0:      *  finalizers that require an empty stack?
aoqi@0:      *  @param target      The tree representing the structure that's aborted
aoqi@0:      *  @param env         The environment current at the non-local exit.
aoqi@0:      */
aoqi@0:     boolean hasFinally(JCTree target, Env<GenContext> env) {
aoqi@0:         while (env.tree != target) {
aoqi@0:             if (env.tree.hasTag(TRY) && env.info.finalize.hasFinalizer())
aoqi@0:                 return true;
aoqi@0:             env = env.next;
aoqi@0:         }
aoqi@0:         return false;
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Normalizing class-members.
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** Distribute member initializer code into constructors and {@code <clinit>}
aoqi@0:      *  method.
aoqi@0:      *  @param defs         The list of class member declarations.
aoqi@0:      *  @param c            The enclosing class.
aoqi@0:      */
aoqi@0:     List<JCTree> normalizeDefs(List<JCTree> defs, ClassSymbol c) {
aoqi@0:         ListBuffer<JCStatement> initCode = new ListBuffer<JCStatement>();
aoqi@0:         ListBuffer<Attribute.TypeCompound> initTAs = new ListBuffer<Attribute.TypeCompound>();
aoqi@0:         ListBuffer<JCStatement> clinitCode = new ListBuffer<JCStatement>();
aoqi@0:         ListBuffer<Attribute.TypeCompound> clinitTAs = new ListBuffer<Attribute.TypeCompound>();
aoqi@0:         ListBuffer<JCTree> methodDefs = new ListBuffer<JCTree>();
aoqi@0:         // Sort definitions into three listbuffers:
aoqi@0:         //  - initCode for instance initializers
aoqi@0:         //  - clinitCode for class initializers
aoqi@0:         //  - methodDefs for method definitions
aoqi@0:         for (List<JCTree> l = defs; l.nonEmpty(); l = l.tail) {
aoqi@0:             JCTree def = l.head;
aoqi@0:             switch (def.getTag()) {
aoqi@0:             case BLOCK:
aoqi@0:                 JCBlock block = (JCBlock)def;
aoqi@0:                 if ((block.flags & STATIC) != 0)
aoqi@0:                     clinitCode.append(block);
mcimadamore@2789:                 else if ((block.flags & SYNTHETIC) == 0)
aoqi@0:                     initCode.append(block);
aoqi@0:                 break;
aoqi@0:             case METHODDEF:
aoqi@0:                 methodDefs.append(def);
aoqi@0:                 break;
aoqi@0:             case VARDEF:
aoqi@0:                 JCVariableDecl vdef = (JCVariableDecl) def;
aoqi@0:                 VarSymbol sym = vdef.sym;
aoqi@0:                 checkDimension(vdef.pos(), sym.type);
aoqi@0:                 if (vdef.init != null) {
aoqi@0:                     if ((sym.flags() & STATIC) == 0) {
aoqi@0:                         // Always initialize instance variables.
aoqi@0:                         JCStatement init = make.at(vdef.pos()).
aoqi@0:                             Assignment(sym, vdef.init);
aoqi@0:                         initCode.append(init);
aoqi@0:                         endPosTable.replaceTree(vdef, init);
aoqi@0:                         initTAs.addAll(getAndRemoveNonFieldTAs(sym));
aoqi@0:                     } else if (sym.getConstValue() == null) {
aoqi@0:                         // Initialize class (static) variables only if
aoqi@0:                         // they are not compile-time constants.
aoqi@0:                         JCStatement init = make.at(vdef.pos).
aoqi@0:                             Assignment(sym, vdef.init);
aoqi@0:                         clinitCode.append(init);
aoqi@0:                         endPosTable.replaceTree(vdef, init);
aoqi@0:                         clinitTAs.addAll(getAndRemoveNonFieldTAs(sym));
aoqi@0:                     } else {
aoqi@0:                         checkStringConstant(vdef.init.pos(), sym.getConstValue());
vromero@2810:                         /* if the init contains a reference to an external class, add it to the
vromero@2810:                          * constant's pool
vromero@2810:                          */
vromero@2810:                         vdef.init.accept(classReferenceVisitor);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 break;
aoqi@0:             default:
aoqi@0:                 Assert.error();
aoqi@0:             }
aoqi@0:         }
aoqi@0:         // Insert any instance initializers into all constructors.
aoqi@0:         if (initCode.length() != 0) {
aoqi@0:             List<JCStatement> inits = initCode.toList();
aoqi@0:             initTAs.addAll(c.getInitTypeAttributes());
aoqi@0:             List<Attribute.TypeCompound> initTAlist = initTAs.toList();
aoqi@0:             for (JCTree t : methodDefs) {
aoqi@0:                 normalizeMethod((JCMethodDecl)t, inits, initTAlist);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         // If there are class initializers, create a <clinit> method
aoqi@0:         // that contains them as its body.
aoqi@0:         if (clinitCode.length() != 0) {
aoqi@0:             MethodSymbol clinit = new MethodSymbol(
aoqi@0:                 STATIC | (c.flags() & STRICTFP),
aoqi@0:                 names.clinit,
aoqi@0:                 new MethodType(
aoqi@0:                     List.<Type>nil(), syms.voidType,
aoqi@0:                     List.<Type>nil(), syms.methodClass),
aoqi@0:                 c);
aoqi@0:             c.members().enter(clinit);
aoqi@0:             List<JCStatement> clinitStats = clinitCode.toList();
aoqi@0:             JCBlock block = make.at(clinitStats.head.pos()).Block(0, clinitStats);
aoqi@0:             block.endpos = TreeInfo.endPos(clinitStats.last());
aoqi@0:             methodDefs.append(make.MethodDef(clinit, block));
aoqi@0: 
aoqi@0:             if (!clinitTAs.isEmpty())
aoqi@0:                 clinit.appendUniqueTypeAttributes(clinitTAs.toList());
aoqi@0:             if (!c.getClassInitTypeAttributes().isEmpty())
aoqi@0:                 clinit.appendUniqueTypeAttributes(c.getClassInitTypeAttributes());
aoqi@0:         }
aoqi@0:         // Return all method definitions.
aoqi@0:         return methodDefs.toList();
aoqi@0:     }
aoqi@0: 
aoqi@0:     private List<Attribute.TypeCompound> getAndRemoveNonFieldTAs(VarSymbol sym) {
aoqi@0:         List<TypeCompound> tas = sym.getRawTypeAttributes();
aoqi@0:         ListBuffer<Attribute.TypeCompound> fieldTAs = new ListBuffer<Attribute.TypeCompound>();
aoqi@0:         ListBuffer<Attribute.TypeCompound> nonfieldTAs = new ListBuffer<Attribute.TypeCompound>();
aoqi@0:         for (TypeCompound ta : tas) {
aoqi@0:             if (ta.getPosition().type == TargetType.FIELD) {
aoqi@0:                 fieldTAs.add(ta);
aoqi@0:             } else {
aoqi@0:                 if (typeAnnoAsserts) {
aoqi@0:                     Assert.error("Type annotation does not have a valid positior");
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 nonfieldTAs.add(ta);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         sym.setTypeAttributes(fieldTAs.toList());
aoqi@0:         return nonfieldTAs.toList();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Check a constant value and report if it is a string that is
aoqi@0:      *  too large.
aoqi@0:      */
aoqi@0:     private void checkStringConstant(DiagnosticPosition pos, Object constValue) {
aoqi@0:         if (nerrs != 0 || // only complain about a long string once
aoqi@0:             constValue == null ||
aoqi@0:             !(constValue instanceof String) ||
aoqi@0:             ((String)constValue).length() < Pool.MAX_STRING_LENGTH)
aoqi@0:             return;
aoqi@0:         log.error(pos, "limit.string");
aoqi@0:         nerrs++;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Insert instance initializer code into initial constructor.
aoqi@0:      *  @param md        The tree potentially representing a
aoqi@0:      *                   constructor's definition.
aoqi@0:      *  @param initCode  The list of instance initializer statements.
aoqi@0:      *  @param initTAs  Type annotations from the initializer expression.
aoqi@0:      */
aoqi@0:     void normalizeMethod(JCMethodDecl md, List<JCStatement> initCode, List<TypeCompound> initTAs) {
aoqi@0:         if (md.name == names.init && TreeInfo.isInitialConstructor(md)) {
aoqi@0:             // We are seeing a constructor that does not call another
aoqi@0:             // constructor of the same class.
aoqi@0:             List<JCStatement> stats = md.body.stats;
aoqi@0:             ListBuffer<JCStatement> newstats = new ListBuffer<JCStatement>();
aoqi@0: 
aoqi@0:             if (stats.nonEmpty()) {
aoqi@0:                 // Copy initializers of synthetic variables generated in
aoqi@0:                 // the translation of inner classes.
aoqi@0:                 while (TreeInfo.isSyntheticInit(stats.head)) {
aoqi@0:                     newstats.append(stats.head);
aoqi@0:                     stats = stats.tail;
aoqi@0:                 }
aoqi@0:                 // Copy superclass constructor call
aoqi@0:                 newstats.append(stats.head);
aoqi@0:                 stats = stats.tail;
aoqi@0:                 // Copy remaining synthetic initializers.
aoqi@0:                 while (stats.nonEmpty() &&
aoqi@0:                        TreeInfo.isSyntheticInit(stats.head)) {
aoqi@0:                     newstats.append(stats.head);
aoqi@0:                     stats = stats.tail;
aoqi@0:                 }
aoqi@0:                 // Now insert the initializer code.
aoqi@0:                 newstats.appendList(initCode);
aoqi@0:                 // And copy all remaining statements.
aoqi@0:                 while (stats.nonEmpty()) {
aoqi@0:                     newstats.append(stats.head);
aoqi@0:                     stats = stats.tail;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             md.body.stats = newstats.toList();
aoqi@0:             if (md.body.endpos == Position.NOPOS)
aoqi@0:                 md.body.endpos = TreeInfo.endPos(md.body.stats.last());
aoqi@0: 
aoqi@0:             md.sym.appendUniqueTypeAttributes(initTAs);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ********************************************************************
aoqi@0:  * Adding miranda methods
aoqi@0:  *********************************************************************/
aoqi@0: 
aoqi@0:     /** Add abstract methods for all methods defined in one of
aoqi@0:      *  the interfaces of a given class,
aoqi@0:      *  provided they are not already implemented in the class.
aoqi@0:      *
aoqi@0:      *  @param c      The class whose interfaces are searched for methods
aoqi@0:      *                for which Miranda methods should be added.
aoqi@0:      */
aoqi@0:     void implementInterfaceMethods(ClassSymbol c) {
aoqi@0:         implementInterfaceMethods(c, c);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Add abstract methods for all methods defined in one of
aoqi@0:      *  the interfaces of a given class,
aoqi@0:      *  provided they are not already implemented in the class.
aoqi@0:      *
aoqi@0:      *  @param c      The class whose interfaces are searched for methods
aoqi@0:      *                for which Miranda methods should be added.
aoqi@0:      *  @param site   The class in which a definition may be needed.
aoqi@0:      */
aoqi@0:     void implementInterfaceMethods(ClassSymbol c, ClassSymbol site) {
aoqi@0:         for (List<Type> l = types.interfaces(c.type); l.nonEmpty(); l = l.tail) {
aoqi@0:             ClassSymbol i = (ClassSymbol)l.head.tsym;
aoqi@0:             for (Scope.Entry e = i.members().elems;
aoqi@0:                  e != null;
aoqi@0:                  e = e.sibling)
aoqi@0:             {
aoqi@0:                 if (e.sym.kind == MTH && (e.sym.flags() & STATIC) == 0)
aoqi@0:                 {
aoqi@0:                     MethodSymbol absMeth = (MethodSymbol)e.sym;
aoqi@0:                     MethodSymbol implMeth = absMeth.binaryImplementation(site, types);
aoqi@0:                     if (implMeth == null)
aoqi@0:                         addAbstractMethod(site, absMeth);
aoqi@0:                     else if ((implMeth.flags() & IPROXY) != 0)
aoqi@0:                         adjustAbstractMethod(site, implMeth, absMeth);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             implementInterfaceMethods(i, site);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Add an abstract methods to a class
aoqi@0:      *  which implicitly implements a method defined in some interface
aoqi@0:      *  implemented by the class. These methods are called "Miranda methods".
aoqi@0:      *  Enter the newly created method into its enclosing class scope.
aoqi@0:      *  Note that it is not entered into the class tree, as the emitter
aoqi@0:      *  doesn't need to see it there to emit an abstract method.
aoqi@0:      *
aoqi@0:      *  @param c      The class to which the Miranda method is added.
aoqi@0:      *  @param m      The interface method symbol for which a Miranda method
aoqi@0:      *                is added.
aoqi@0:      */
aoqi@0:     private void addAbstractMethod(ClassSymbol c,
aoqi@0:                                    MethodSymbol m) {
aoqi@0:         MethodSymbol absMeth = new MethodSymbol(
aoqi@0:             m.flags() | IPROXY | SYNTHETIC, m.name,
aoqi@0:             m.type, // was c.type.memberType(m), but now only !generics supported
aoqi@0:             c);
aoqi@0:         c.members().enter(absMeth); // add to symbol table
aoqi@0:     }
aoqi@0: 
aoqi@0:     private void adjustAbstractMethod(ClassSymbol c,
aoqi@0:                                       MethodSymbol pm,
aoqi@0:                                       MethodSymbol im) {
aoqi@0:         MethodType pmt = (MethodType)pm.type;
aoqi@0:         Type imt = types.memberType(c.type, im);
aoqi@0:         pmt.thrown = chk.intersect(pmt.getThrownTypes(), imt.getThrownTypes());
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Traversal methods
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** Visitor argument: The current environment.
aoqi@0:      */
aoqi@0:     Env<GenContext> env;
aoqi@0: 
aoqi@0:     /** Visitor argument: The expected type (prototype).
aoqi@0:      */
aoqi@0:     Type pt;
aoqi@0: 
aoqi@0:     /** Visitor result: The item representing the computed value.
aoqi@0:      */
aoqi@0:     Item result;
aoqi@0: 
aoqi@0:     /** Visitor method: generate code for a definition, catching and reporting
aoqi@0:      *  any completion failures.
aoqi@0:      *  @param tree    The definition to be visited.
aoqi@0:      *  @param env     The environment current at the definition.
aoqi@0:      */
aoqi@0:     public void genDef(JCTree tree, Env<GenContext> env) {
aoqi@0:         Env<GenContext> prevEnv = this.env;
aoqi@0:         try {
aoqi@0:             this.env = env;
aoqi@0:             tree.accept(this);
aoqi@0:         } catch (CompletionFailure ex) {
aoqi@0:             chk.completionError(tree.pos(), ex);
aoqi@0:         } finally {
aoqi@0:             this.env = prevEnv;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: check whether CharacterRangeTable
aoqi@0:      *  should be emitted, if so, put a new entry into CRTable
aoqi@0:      *  and call method to generate bytecode.
aoqi@0:      *  If not, just call method to generate bytecode.
aoqi@0:      *  @see    #genStat(JCTree, Env)
aoqi@0:      *
aoqi@0:      *  @param  tree     The tree to be visited.
aoqi@0:      *  @param  env      The environment to use.
aoqi@0:      *  @param  crtFlags The CharacterRangeTable flags
aoqi@0:      *                   indicating type of the entry.
aoqi@0:      */
aoqi@0:     public void genStat(JCTree tree, Env<GenContext> env, int crtFlags) {
aoqi@0:         if (!genCrt) {
aoqi@0:             genStat(tree, env);
aoqi@0:             return;
aoqi@0:         }
aoqi@0:         int startpc = code.curCP();
aoqi@0:         genStat(tree, env);
aoqi@0:         if (tree.hasTag(Tag.BLOCK)) crtFlags |= CRT_BLOCK;
aoqi@0:         code.crt.put(tree, crtFlags, startpc, code.curCP());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: generate code for a statement.
aoqi@0:      */
aoqi@0:     public void genStat(JCTree tree, Env<GenContext> env) {
aoqi@0:         if (code.isAlive()) {
aoqi@0:             code.statBegin(tree.pos);
aoqi@0:             genDef(tree, env);
aoqi@0:         } else if (env.info.isSwitch && tree.hasTag(VARDEF)) {
aoqi@0:             // variables whose declarations are in a switch
aoqi@0:             // can be used even if the decl is unreachable.
aoqi@0:             code.newLocal(((JCVariableDecl) tree).sym);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: check whether CharacterRangeTable
aoqi@0:      *  should be emitted, if so, put a new entry into CRTable
aoqi@0:      *  and call method to generate bytecode.
aoqi@0:      *  If not, just call method to generate bytecode.
aoqi@0:      *  @see    #genStats(List, Env)
aoqi@0:      *
aoqi@0:      *  @param  trees    The list of trees to be visited.
aoqi@0:      *  @param  env      The environment to use.
aoqi@0:      *  @param  crtFlags The CharacterRangeTable flags
aoqi@0:      *                   indicating type of the entry.
aoqi@0:      */
aoqi@0:     public void genStats(List<JCStatement> trees, Env<GenContext> env, int crtFlags) {
aoqi@0:         if (!genCrt) {
aoqi@0:             genStats(trees, env);
aoqi@0:             return;
aoqi@0:         }
aoqi@0:         if (trees.length() == 1) {        // mark one statement with the flags
aoqi@0:             genStat(trees.head, env, crtFlags | CRT_STATEMENT);
aoqi@0:         } else {
aoqi@0:             int startpc = code.curCP();
aoqi@0:             genStats(trees, env);
aoqi@0:             code.crt.put(trees, crtFlags, startpc, code.curCP());
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: generate code for a list of statements.
aoqi@0:      */
aoqi@0:     public void genStats(List<? extends JCTree> trees, Env<GenContext> env) {
aoqi@0:         for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
aoqi@0:             genStat(l.head, env, CRT_STATEMENT);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: check whether CharacterRangeTable
aoqi@0:      *  should be emitted, if so, put a new entry into CRTable
aoqi@0:      *  and call method to generate bytecode.
aoqi@0:      *  If not, just call method to generate bytecode.
aoqi@0:      *  @see    #genCond(JCTree,boolean)
aoqi@0:      *
aoqi@0:      *  @param  tree     The tree to be visited.
aoqi@0:      *  @param  crtFlags The CharacterRangeTable flags
aoqi@0:      *                   indicating type of the entry.
aoqi@0:      */
aoqi@0:     public CondItem genCond(JCTree tree, int crtFlags) {
aoqi@0:         if (!genCrt) return genCond(tree, false);
aoqi@0:         int startpc = code.curCP();
aoqi@0:         CondItem item = genCond(tree, (crtFlags & CRT_FLOW_CONTROLLER) != 0);
aoqi@0:         code.crt.put(tree, crtFlags, startpc, code.curCP());
aoqi@0:         return item;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: generate code for a boolean
aoqi@0:      *  expression in a control-flow context.
aoqi@0:      *  @param _tree         The expression to be visited.
aoqi@0:      *  @param markBranches The flag to indicate that the condition is
aoqi@0:      *                      a flow controller so produced conditions
aoqi@0:      *                      should contain a proper tree to generate
aoqi@0:      *                      CharacterRangeTable branches for them.
aoqi@0:      */
aoqi@0:     public CondItem genCond(JCTree _tree, boolean markBranches) {
aoqi@0:         JCTree inner_tree = TreeInfo.skipParens(_tree);
aoqi@0:         if (inner_tree.hasTag(CONDEXPR)) {
aoqi@0:             JCConditional tree = (JCConditional)inner_tree;
aoqi@0:             CondItem cond = genCond(tree.cond, CRT_FLOW_CONTROLLER);
aoqi@0:             if (cond.isTrue()) {
aoqi@0:                 code.resolve(cond.trueJumps);
aoqi@0:                 CondItem result = genCond(tree.truepart, CRT_FLOW_TARGET);
aoqi@0:                 if (markBranches) result.tree = tree.truepart;
aoqi@0:                 return result;
aoqi@0:             }
aoqi@0:             if (cond.isFalse()) {
aoqi@0:                 code.resolve(cond.falseJumps);
aoqi@0:                 CondItem result = genCond(tree.falsepart, CRT_FLOW_TARGET);
aoqi@0:                 if (markBranches) result.tree = tree.falsepart;
aoqi@0:                 return result;
aoqi@0:             }
aoqi@0:             Chain secondJumps = cond.jumpFalse();
aoqi@0:             code.resolve(cond.trueJumps);
aoqi@0:             CondItem first = genCond(tree.truepart, CRT_FLOW_TARGET);
aoqi@0:             if (markBranches) first.tree = tree.truepart;
aoqi@0:             Chain falseJumps = first.jumpFalse();
aoqi@0:             code.resolve(first.trueJumps);
aoqi@0:             Chain trueJumps = code.branch(goto_);
aoqi@0:             code.resolve(secondJumps);
aoqi@0:             CondItem second = genCond(tree.falsepart, CRT_FLOW_TARGET);
aoqi@0:             CondItem result = items.makeCondItem(second.opcode,
aoqi@0:                                       Code.mergeChains(trueJumps, second.trueJumps),
aoqi@0:                                       Code.mergeChains(falseJumps, second.falseJumps));
aoqi@0:             if (markBranches) result.tree = tree.falsepart;
aoqi@0:             return result;
aoqi@0:         } else {
aoqi@0:             CondItem result = genExpr(_tree, syms.booleanType).mkCond();
aoqi@0:             if (markBranches) result.tree = _tree;
aoqi@0:             return result;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Visitor class for expressions which might be constant expressions.
aoqi@0:      *  This class is a subset of TreeScanner. Intended to visit trees pruned by
aoqi@0:      *  Lower as long as constant expressions looking for references to any
aoqi@0:      *  ClassSymbol. Any such reference will be added to the constant pool so
aoqi@0:      *  automated tools can detect class dependencies better.
aoqi@0:      */
aoqi@0:     class ClassReferenceVisitor extends JCTree.Visitor {
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitTree(JCTree tree) {}
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitBinary(JCBinary tree) {
aoqi@0:             tree.lhs.accept(this);
aoqi@0:             tree.rhs.accept(this);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitSelect(JCFieldAccess tree) {
aoqi@0:             if (tree.selected.type.hasTag(CLASS)) {
aoqi@0:                 makeRef(tree.selected.pos(), tree.selected.type);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitIdent(JCIdent tree) {
aoqi@0:             if (tree.sym.owner instanceof ClassSymbol) {
aoqi@0:                 pool.put(tree.sym.owner);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitConditional(JCConditional tree) {
aoqi@0:             tree.cond.accept(this);
aoqi@0:             tree.truepart.accept(this);
aoqi@0:             tree.falsepart.accept(this);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitUnary(JCUnary tree) {
aoqi@0:             tree.arg.accept(this);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitParens(JCParens tree) {
aoqi@0:             tree.expr.accept(this);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void visitTypeCast(JCTypeCast tree) {
aoqi@0:             tree.expr.accept(this);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     private ClassReferenceVisitor classReferenceVisitor = new ClassReferenceVisitor();
aoqi@0: 
aoqi@0:     /** Visitor method: generate code for an expression, catching and reporting
aoqi@0:      *  any completion failures.
aoqi@0:      *  @param tree    The expression to be visited.
aoqi@0:      *  @param pt      The expression's expected type (proto-type).
aoqi@0:      */
aoqi@0:     public Item genExpr(JCTree tree, Type pt) {
aoqi@0:         Type prevPt = this.pt;
aoqi@0:         try {
aoqi@0:             if (tree.type.constValue() != null) {
aoqi@0:                 // Short circuit any expressions which are constants
aoqi@0:                 tree.accept(classReferenceVisitor);
aoqi@0:                 checkStringConstant(tree.pos(), tree.type.constValue());
aoqi@0:                 result = items.makeImmediateItem(tree.type, tree.type.constValue());
aoqi@0:             } else {
aoqi@0:                 this.pt = pt;
aoqi@0:                 tree.accept(this);
aoqi@0:             }
aoqi@0:             return result.coerce(pt);
aoqi@0:         } catch (CompletionFailure ex) {
aoqi@0:             chk.completionError(tree.pos(), ex);
aoqi@0:             code.state.stacksize = 1;
aoqi@0:             return items.makeStackItem(pt);
aoqi@0:         } finally {
aoqi@0:             this.pt = prevPt;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Derived visitor method: generate code for a list of method arguments.
aoqi@0:      *  @param trees    The argument expressions to be visited.
aoqi@0:      *  @param pts      The expression's expected types (i.e. the formal parameter
aoqi@0:      *                  types of the invoked method).
aoqi@0:      */
aoqi@0:     public void genArgs(List<JCExpression> trees, List<Type> pts) {
aoqi@0:         for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) {
aoqi@0:             genExpr(l.head, pts.head).load();
aoqi@0:             pts = pts.tail;
aoqi@0:         }
aoqi@0:         // require lists be of same length
aoqi@0:         Assert.check(pts.isEmpty());
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Visitor methods for statements and definitions
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** Thrown when the byte code size exceeds limit.
aoqi@0:      */
aoqi@0:     public static class CodeSizeOverflow extends RuntimeException {
aoqi@0:         private static final long serialVersionUID = 0;
aoqi@0:         public CodeSizeOverflow() {}
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitMethodDef(JCMethodDecl tree) {
aoqi@0:         // Create a new local environment that points pack at method
aoqi@0:         // definition.
aoqi@0:         Env<GenContext> localEnv = env.dup(tree);
aoqi@0:         localEnv.enclMethod = tree;
aoqi@0:         // The expected type of every return statement in this method
aoqi@0:         // is the method's return type.
aoqi@0:         this.pt = tree.sym.erasure(types).getReturnType();
aoqi@0: 
aoqi@0:         checkDimension(tree.pos(), tree.sym.erasure(types));
aoqi@0:         genMethod(tree, localEnv, false);
aoqi@0:     }
aoqi@0: //where
aoqi@0:         /** Generate code for a method.
aoqi@0:          *  @param tree     The tree representing the method definition.
aoqi@0:          *  @param env      The environment current for the method body.
aoqi@0:          *  @param fatcode  A flag that indicates whether all jumps are
aoqi@0:          *                  within 32K.  We first invoke this method under
aoqi@0:          *                  the assumption that fatcode == false, i.e. all
aoqi@0:          *                  jumps are within 32K.  If this fails, fatcode
aoqi@0:          *                  is set to true and we try again.
aoqi@0:          */
aoqi@0:         void genMethod(JCMethodDecl tree, Env<GenContext> env, boolean fatcode) {
aoqi@0:             MethodSymbol meth = tree.sym;
aoqi@0:             int extras = 0;
aoqi@0:             // Count up extra parameters
aoqi@0:             if (meth.isConstructor()) {
aoqi@0:                 extras++;
aoqi@0:                 if (meth.enclClass().isInner() &&
aoqi@0:                     !meth.enclClass().isStatic()) {
aoqi@0:                     extras++;
aoqi@0:                 }
aoqi@0:             } else if ((tree.mods.flags & STATIC) == 0) {
aoqi@0:                 extras++;
aoqi@0:             }
aoqi@0:             //      System.err.println("Generating " + meth + " in " + meth.owner); //DEBUG
aoqi@0:             if (Code.width(types.erasure(env.enclMethod.sym.type).getParameterTypes()) + extras >
aoqi@0:                 ClassFile.MAX_PARAMETERS) {
aoqi@0:                 log.error(tree.pos(), "limit.parameters");
aoqi@0:                 nerrs++;
aoqi@0:             }
aoqi@0: 
aoqi@0:             else if (tree.body != null) {
aoqi@0:                 // Create a new code structure and initialize it.
aoqi@0:                 int startpcCrt = initCode(tree, env, fatcode);
aoqi@0: 
aoqi@0:                 try {
aoqi@0:                     genStat(tree.body, env);
aoqi@0:                 } catch (CodeSizeOverflow e) {
aoqi@0:                     // Failed due to code limit, try again with jsr/ret
aoqi@0:                     startpcCrt = initCode(tree, env, fatcode);
aoqi@0:                     genStat(tree.body, env);
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 if (code.state.stacksize != 0) {
aoqi@0:                     log.error(tree.body.pos(), "stack.sim.error", tree);
aoqi@0:                     throw new AssertionError();
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 // If last statement could complete normally, insert a
aoqi@0:                 // return at the end.
aoqi@0:                 if (code.isAlive()) {
aoqi@0:                     code.statBegin(TreeInfo.endPos(tree.body));
aoqi@0:                     if (env.enclMethod == null ||
aoqi@0:                         env.enclMethod.sym.type.getReturnType().hasTag(VOID)) {
aoqi@0:                         code.emitop0(return_);
aoqi@0:                     } else {
aoqi@0:                         // sometime dead code seems alive (4415991);
aoqi@0:                         // generate a small loop instead
aoqi@0:                         int startpc = code.entryPoint();
aoqi@0:                         CondItem c = items.makeCondItem(goto_);
aoqi@0:                         code.resolve(c.jumpTrue(), startpc);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 if (genCrt)
aoqi@0:                     code.crt.put(tree.body,
aoqi@0:                                  CRT_BLOCK,
aoqi@0:                                  startpcCrt,
aoqi@0:                                  code.curCP());
aoqi@0: 
aoqi@0:                 code.endScopes(0);
aoqi@0: 
aoqi@0:                 // If we exceeded limits, panic
aoqi@0:                 if (code.checkLimits(tree.pos(), log)) {
aoqi@0:                     nerrs++;
aoqi@0:                     return;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 // If we generated short code but got a long jump, do it again
aoqi@0:                 // with fatCode = true.
aoqi@0:                 if (!fatcode && code.fatcode) genMethod(tree, env, true);
aoqi@0: 
aoqi@0:                 // Clean up
aoqi@0:                 if(stackMap == StackMapFormat.JSR202) {
aoqi@0:                     code.lastFrame = null;
aoqi@0:                     code.frameBeforeLast = null;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 // Compress exception table
aoqi@0:                 code.compressCatchTable();
aoqi@0: 
aoqi@0:                 // Fill in type annotation positions for exception parameters
aoqi@0:                 code.fillExceptionParameterPositions();
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private int initCode(JCMethodDecl tree, Env<GenContext> env, boolean fatcode) {
aoqi@0:             MethodSymbol meth = tree.sym;
aoqi@0: 
aoqi@0:             // Create a new code structure.
aoqi@0:             meth.code = code = new Code(meth,
aoqi@0:                                         fatcode,
aoqi@0:                                         lineDebugInfo ? toplevel.lineMap : null,
aoqi@0:                                         varDebugInfo,
aoqi@0:                                         stackMap,
aoqi@0:                                         debugCode,
aoqi@0:                                         genCrt ? new CRTable(tree, env.toplevel.endPositions)
aoqi@0:                                                : null,
aoqi@0:                                         syms,
aoqi@0:                                         types,
vromero@2709:                                         pool);
aoqi@0:             items = new Items(pool, code, syms, types);
aoqi@0:             if (code.debugCode) {
aoqi@0:                 System.err.println(meth + " for body " + tree);
aoqi@0:             }
aoqi@0: 
aoqi@0:             // If method is not static, create a new local variable address
aoqi@0:             // for `this'.
aoqi@0:             if ((tree.mods.flags & STATIC) == 0) {
aoqi@0:                 Type selfType = meth.owner.type;
aoqi@0:                 if (meth.isConstructor() && selfType != syms.objectType)
aoqi@0:                     selfType = UninitializedType.uninitializedThis(selfType);
aoqi@0:                 code.setDefined(
aoqi@0:                         code.newLocal(
aoqi@0:                             new VarSymbol(FINAL, names._this, selfType, meth.owner)));
aoqi@0:             }
aoqi@0: 
aoqi@0:             // Mark all parameters as defined from the beginning of
aoqi@0:             // the method.
aoqi@0:             for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
aoqi@0:                 checkDimension(l.head.pos(), l.head.sym.type);
aoqi@0:                 code.setDefined(code.newLocal(l.head.sym));
aoqi@0:             }
aoqi@0: 
aoqi@0:             // Get ready to generate code for method body.
aoqi@0:             int startpcCrt = genCrt ? code.curCP() : 0;
aoqi@0:             code.entryPoint();
aoqi@0: 
aoqi@0:             // Suppress initial stackmap
aoqi@0:             code.pendingStackMap = false;
aoqi@0: 
aoqi@0:             return startpcCrt;
aoqi@0:         }
aoqi@0: 
aoqi@0:     public void visitVarDef(JCVariableDecl tree) {
aoqi@0:         VarSymbol v = tree.sym;
aoqi@0:         code.newLocal(v);
aoqi@0:         if (tree.init != null) {
aoqi@0:             checkStringConstant(tree.init.pos(), v.getConstValue());
aoqi@0:             if (v.getConstValue() == null || varDebugInfo) {
aoqi@0:                 genExpr(tree.init, v.erasure(types)).load();
aoqi@0:                 items.makeLocalItem(v).store();
aoqi@0:             }
aoqi@0:         }
aoqi@0:         checkDimension(tree.pos(), v.type);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitSkip(JCSkip tree) {
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitBlock(JCBlock tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         Env<GenContext> localEnv = env.dup(tree, new GenContext());
aoqi@0:         genStats(tree.stats, localEnv);
aoqi@0:         // End the scope of all block-local variables in variable info.
aoqi@0:         if (!env.tree.hasTag(METHODDEF)) {
aoqi@0:             code.statBegin(tree.endpos);
aoqi@0:             code.endScopes(limit);
aoqi@0:             code.pendingStatPos = Position.NOPOS;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitDoLoop(JCDoWhileLoop tree) {
aoqi@0:         genLoop(tree, tree.body, tree.cond, List.<JCExpressionStatement>nil(), false);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitWhileLoop(JCWhileLoop tree) {
aoqi@0:         genLoop(tree, tree.body, tree.cond, List.<JCExpressionStatement>nil(), true);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitForLoop(JCForLoop tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         genStats(tree.init, env);
aoqi@0:         genLoop(tree, tree.body, tree.cond, tree.step, true);
aoqi@0:         code.endScopes(limit);
aoqi@0:     }
aoqi@0:     //where
aoqi@0:         /** Generate code for a loop.
aoqi@0:          *  @param loop       The tree representing the loop.
aoqi@0:          *  @param body       The loop's body.
aoqi@0:          *  @param cond       The loop's controling condition.
aoqi@0:          *  @param step       "Step" statements to be inserted at end of
aoqi@0:          *                    each iteration.
aoqi@0:          *  @param testFirst  True if the loop test belongs before the body.
aoqi@0:          */
aoqi@0:         private void genLoop(JCStatement loop,
aoqi@0:                              JCStatement body,
aoqi@0:                              JCExpression cond,
aoqi@0:                              List<JCExpressionStatement> step,
aoqi@0:                              boolean testFirst) {
aoqi@0:             Env<GenContext> loopEnv = env.dup(loop, new GenContext());
aoqi@0:             int startpc = code.entryPoint();
vromero@2638:             if (testFirst) { //while or for loop
aoqi@0:                 CondItem c;
aoqi@0:                 if (cond != null) {
aoqi@0:                     code.statBegin(cond.pos);
aoqi@0:                     c = genCond(TreeInfo.skipParens(cond), CRT_FLOW_CONTROLLER);
aoqi@0:                 } else {
aoqi@0:                     c = items.makeCondItem(goto_);
aoqi@0:                 }
aoqi@0:                 Chain loopDone = c.jumpFalse();
aoqi@0:                 code.resolve(c.trueJumps);
aoqi@0:                 genStat(body, loopEnv, CRT_STATEMENT | CRT_FLOW_TARGET);
aoqi@0:                 code.resolve(loopEnv.info.cont);
aoqi@0:                 genStats(step, loopEnv);
aoqi@0:                 code.resolve(code.branch(goto_), startpc);
aoqi@0:                 code.resolve(loopDone);
aoqi@0:             } else {
aoqi@0:                 genStat(body, loopEnv, CRT_STATEMENT | CRT_FLOW_TARGET);
aoqi@0:                 code.resolve(loopEnv.info.cont);
aoqi@0:                 genStats(step, loopEnv);
aoqi@0:                 CondItem c;
aoqi@0:                 if (cond != null) {
aoqi@0:                     code.statBegin(cond.pos);
aoqi@0:                     c = genCond(TreeInfo.skipParens(cond), CRT_FLOW_CONTROLLER);
aoqi@0:                 } else {
aoqi@0:                     c = items.makeCondItem(goto_);
aoqi@0:                 }
aoqi@0:                 code.resolve(c.jumpTrue(), startpc);
aoqi@0:                 code.resolve(c.falseJumps);
aoqi@0:             }
aoqi@0:             code.resolve(loopEnv.info.exit);
vromero@2638:             if (loopEnv.info.exit != null) {
vromero@2638:                 loopEnv.info.exit.state.defined.excludeFrom(code.nextreg);
vromero@2638:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:     public void visitForeachLoop(JCEnhancedForLoop tree) {
aoqi@0:         throw new AssertionError(); // should have been removed by Lower.
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitLabelled(JCLabeledStatement tree) {
aoqi@0:         Env<GenContext> localEnv = env.dup(tree, new GenContext());
aoqi@0:         genStat(tree.body, localEnv, CRT_STATEMENT);
aoqi@0:         code.resolve(localEnv.info.exit);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitSwitch(JCSwitch tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         Assert.check(!tree.selector.type.hasTag(CLASS));
aoqi@0:         int startpcCrt = genCrt ? code.curCP() : 0;
aoqi@0:         Item sel = genExpr(tree.selector, syms.intType);
aoqi@0:         List<JCCase> cases = tree.cases;
aoqi@0:         if (cases.isEmpty()) {
aoqi@0:             // We are seeing:  switch <sel> {}
aoqi@0:             sel.load().drop();
aoqi@0:             if (genCrt)
aoqi@0:                 code.crt.put(TreeInfo.skipParens(tree.selector),
aoqi@0:                              CRT_FLOW_CONTROLLER, startpcCrt, code.curCP());
aoqi@0:         } else {
aoqi@0:             // We are seeing a nonempty switch.
aoqi@0:             sel.load();
aoqi@0:             if (genCrt)
aoqi@0:                 code.crt.put(TreeInfo.skipParens(tree.selector),
aoqi@0:                              CRT_FLOW_CONTROLLER, startpcCrt, code.curCP());
aoqi@0:             Env<GenContext> switchEnv = env.dup(tree, new GenContext());
aoqi@0:             switchEnv.info.isSwitch = true;
aoqi@0: 
aoqi@0:             // Compute number of labels and minimum and maximum label values.
aoqi@0:             // For each case, store its label in an array.
aoqi@0:             int lo = Integer.MAX_VALUE;  // minimum label.
aoqi@0:             int hi = Integer.MIN_VALUE;  // maximum label.
aoqi@0:             int nlabels = 0;               // number of labels.
aoqi@0: 
aoqi@0:             int[] labels = new int[cases.length()];  // the label array.
aoqi@0:             int defaultIndex = -1;     // the index of the default clause.
aoqi@0: 
aoqi@0:             List<JCCase> l = cases;
aoqi@0:             for (int i = 0; i < labels.length; i++) {
aoqi@0:                 if (l.head.pat != null) {
aoqi@0:                     int val = ((Number)l.head.pat.type.constValue()).intValue();
aoqi@0:                     labels[i] = val;
aoqi@0:                     if (val < lo) lo = val;
aoqi@0:                     if (hi < val) hi = val;
aoqi@0:                     nlabels++;
aoqi@0:                 } else {
aoqi@0:                     Assert.check(defaultIndex == -1);
aoqi@0:                     defaultIndex = i;
aoqi@0:                 }
aoqi@0:                 l = l.tail;
aoqi@0:             }
aoqi@0: 
aoqi@0:             // Determine whether to issue a tableswitch or a lookupswitch
aoqi@0:             // instruction.
aoqi@0:             long table_space_cost = 4 + ((long) hi - lo + 1); // words
aoqi@0:             long table_time_cost = 3; // comparisons
aoqi@0:             long lookup_space_cost = 3 + 2 * (long) nlabels;
aoqi@0:             long lookup_time_cost = nlabels;
aoqi@0:             int opcode =
aoqi@0:                 nlabels > 0 &&
aoqi@0:                 table_space_cost + 3 * table_time_cost <=
aoqi@0:                 lookup_space_cost + 3 * lookup_time_cost
aoqi@0:                 ?
aoqi@0:                 tableswitch : lookupswitch;
aoqi@0: 
aoqi@0:             int startpc = code.curCP();    // the position of the selector operation
aoqi@0:             code.emitop0(opcode);
aoqi@0:             code.align(4);
aoqi@0:             int tableBase = code.curCP();  // the start of the jump table
aoqi@0:             int[] offsets = null;          // a table of offsets for a lookupswitch
aoqi@0:             code.emit4(-1);                // leave space for default offset
aoqi@0:             if (opcode == tableswitch) {
aoqi@0:                 code.emit4(lo);            // minimum label
aoqi@0:                 code.emit4(hi);            // maximum label
aoqi@0:                 for (long i = lo; i <= hi; i++) {  // leave space for jump table
aoqi@0:                     code.emit4(-1);
aoqi@0:                 }
aoqi@0:             } else {
aoqi@0:                 code.emit4(nlabels);    // number of labels
aoqi@0:                 for (int i = 0; i < nlabels; i++) {
aoqi@0:                     code.emit4(-1); code.emit4(-1); // leave space for lookup table
aoqi@0:                 }
aoqi@0:                 offsets = new int[labels.length];
aoqi@0:             }
aoqi@0:             Code.State stateSwitch = code.state.dup();
aoqi@0:             code.markDead();
aoqi@0: 
aoqi@0:             // For each case do:
aoqi@0:             l = cases;
aoqi@0:             for (int i = 0; i < labels.length; i++) {
aoqi@0:                 JCCase c = l.head;
aoqi@0:                 l = l.tail;
aoqi@0: 
aoqi@0:                 int pc = code.entryPoint(stateSwitch);
aoqi@0:                 // Insert offset directly into code or else into the
aoqi@0:                 // offsets table.
aoqi@0:                 if (i != defaultIndex) {
aoqi@0:                     if (opcode == tableswitch) {
aoqi@0:                         code.put4(
aoqi@0:                             tableBase + 4 * (labels[i] - lo + 3),
aoqi@0:                             pc - startpc);
aoqi@0:                     } else {
aoqi@0:                         offsets[i] = pc - startpc;
aoqi@0:                     }
aoqi@0:                 } else {
aoqi@0:                     code.put4(tableBase, pc - startpc);
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 // Generate code for the statements in this case.
aoqi@0:                 genStats(c.stats, switchEnv, CRT_FLOW_TARGET);
aoqi@0:             }
aoqi@0: 
aoqi@0:             // Resolve all breaks.
aoqi@0:             code.resolve(switchEnv.info.exit);
aoqi@0: 
aoqi@0:             // If we have not set the default offset, we do so now.
aoqi@0:             if (code.get4(tableBase) == -1) {
aoqi@0:                 code.put4(tableBase, code.entryPoint(stateSwitch) - startpc);
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (opcode == tableswitch) {
aoqi@0:                 // Let any unfilled slots point to the default case.
aoqi@0:                 int defaultOffset = code.get4(tableBase);
aoqi@0:                 for (long i = lo; i <= hi; i++) {
aoqi@0:                     int t = (int)(tableBase + 4 * (i - lo + 3));
aoqi@0:                     if (code.get4(t) == -1)
aoqi@0:                         code.put4(t, defaultOffset);
aoqi@0:                 }
aoqi@0:             } else {
aoqi@0:                 // Sort non-default offsets and copy into lookup table.
aoqi@0:                 if (defaultIndex >= 0)
aoqi@0:                     for (int i = defaultIndex; i < labels.length - 1; i++) {
aoqi@0:                         labels[i] = labels[i+1];
aoqi@0:                         offsets[i] = offsets[i+1];
aoqi@0:                     }
aoqi@0:                 if (nlabels > 0)
aoqi@0:                     qsort2(labels, offsets, 0, nlabels - 1);
aoqi@0:                 for (int i = 0; i < nlabels; i++) {
aoqi@0:                     int caseidx = tableBase + 8 * (i + 1);
aoqi@0:                     code.put4(caseidx, labels[i]);
aoqi@0:                     code.put4(caseidx + 4, offsets[i]);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:         code.endScopes(limit);
aoqi@0:     }
aoqi@0: //where
aoqi@0:         /** Sort (int) arrays of keys and values
aoqi@0:          */
aoqi@0:        static void qsort2(int[] keys, int[] values, int lo, int hi) {
aoqi@0:             int i = lo;
aoqi@0:             int j = hi;
aoqi@0:             int pivot = keys[(i+j)/2];
aoqi@0:             do {
aoqi@0:                 while (keys[i] < pivot) i++;
aoqi@0:                 while (pivot < keys[j]) j--;
aoqi@0:                 if (i <= j) {
aoqi@0:                     int temp1 = keys[i];
aoqi@0:                     keys[i] = keys[j];
aoqi@0:                     keys[j] = temp1;
aoqi@0:                     int temp2 = values[i];
aoqi@0:                     values[i] = values[j];
aoqi@0:                     values[j] = temp2;
aoqi@0:                     i++;
aoqi@0:                     j--;
aoqi@0:                 }
aoqi@0:             } while (i <= j);
aoqi@0:             if (lo < j) qsort2(keys, values, lo, j);
aoqi@0:             if (i < hi) qsort2(keys, values, i, hi);
aoqi@0:         }
aoqi@0: 
aoqi@0:     public void visitSynchronized(JCSynchronized tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         // Generate code to evaluate lock and save in temporary variable.
aoqi@0:         final LocalItem lockVar = makeTemp(syms.objectType);
aoqi@0:         genExpr(tree.lock, tree.lock.type).load().duplicate();
aoqi@0:         lockVar.store();
aoqi@0: 
aoqi@0:         // Generate code to enter monitor.
aoqi@0:         code.emitop0(monitorenter);
aoqi@0:         code.state.lock(lockVar.reg);
aoqi@0: 
aoqi@0:         // Generate code for a try statement with given body, no catch clauses
aoqi@0:         // in a new environment with the "exit-monitor" operation as finalizer.
aoqi@0:         final Env<GenContext> syncEnv = env.dup(tree, new GenContext());
aoqi@0:         syncEnv.info.finalize = new GenFinalizer() {
aoqi@0:             void gen() {
aoqi@0:                 genLast();
aoqi@0:                 Assert.check(syncEnv.info.gaps.length() % 2 == 0);
aoqi@0:                 syncEnv.info.gaps.append(code.curCP());
aoqi@0:             }
aoqi@0:             void genLast() {
aoqi@0:                 if (code.isAlive()) {
aoqi@0:                     lockVar.load();
aoqi@0:                     code.emitop0(monitorexit);
aoqi@0:                     code.state.unlock(lockVar.reg);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         };
aoqi@0:         syncEnv.info.gaps = new ListBuffer<Integer>();
aoqi@0:         genTry(tree.body, List.<JCCatch>nil(), syncEnv);
aoqi@0:         code.endScopes(limit);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitTry(final JCTry tree) {
aoqi@0:         // Generate code for a try statement with given body and catch clauses,
aoqi@0:         // in a new environment which calls the finally block if there is one.
aoqi@0:         final Env<GenContext> tryEnv = env.dup(tree, new GenContext());
aoqi@0:         final Env<GenContext> oldEnv = env;
aoqi@0:         if (!useJsrLocally) {
aoqi@0:             useJsrLocally =
aoqi@0:                 (stackMap == StackMapFormat.NONE) &&
aoqi@0:                 (jsrlimit <= 0 ||
aoqi@0:                 jsrlimit < 100 &&
aoqi@0:                 estimateCodeComplexity(tree.finalizer)>jsrlimit);
aoqi@0:         }
aoqi@0:         tryEnv.info.finalize = new GenFinalizer() {
aoqi@0:             void gen() {
aoqi@0:                 if (useJsrLocally) {
aoqi@0:                     if (tree.finalizer != null) {
aoqi@0:                         Code.State jsrState = code.state.dup();
aoqi@0:                         jsrState.push(Code.jsrReturnValue);
aoqi@0:                         tryEnv.info.cont =
aoqi@0:                             new Chain(code.emitJump(jsr),
aoqi@0:                                       tryEnv.info.cont,
aoqi@0:                                       jsrState);
aoqi@0:                     }
aoqi@0:                     Assert.check(tryEnv.info.gaps.length() % 2 == 0);
aoqi@0:                     tryEnv.info.gaps.append(code.curCP());
aoqi@0:                 } else {
aoqi@0:                     Assert.check(tryEnv.info.gaps.length() % 2 == 0);
aoqi@0:                     tryEnv.info.gaps.append(code.curCP());
aoqi@0:                     genLast();
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             void genLast() {
aoqi@0:                 if (tree.finalizer != null)
aoqi@0:                     genStat(tree.finalizer, oldEnv, CRT_BLOCK);
aoqi@0:             }
aoqi@0:             boolean hasFinalizer() {
aoqi@0:                 return tree.finalizer != null;
aoqi@0:             }
aoqi@0:         };
aoqi@0:         tryEnv.info.gaps = new ListBuffer<Integer>();
aoqi@0:         genTry(tree.body, tree.catchers, tryEnv);
aoqi@0:     }
aoqi@0:     //where
aoqi@0:         /** Generate code for a try or synchronized statement
aoqi@0:          *  @param body      The body of the try or synchronized statement.
aoqi@0:          *  @param catchers  The lis of catch clauses.
aoqi@0:          *  @param env       the environment current for the body.
aoqi@0:          */
aoqi@0:         void genTry(JCTree body, List<JCCatch> catchers, Env<GenContext> env) {
aoqi@0:             int limit = code.nextreg;
aoqi@0:             int startpc = code.curCP();
aoqi@0:             Code.State stateTry = code.state.dup();
aoqi@0:             genStat(body, env, CRT_BLOCK);
aoqi@0:             int endpc = code.curCP();
aoqi@0:             boolean hasFinalizer =
aoqi@0:                 env.info.finalize != null &&
aoqi@0:                 env.info.finalize.hasFinalizer();
aoqi@0:             List<Integer> gaps = env.info.gaps.toList();
aoqi@0:             code.statBegin(TreeInfo.endPos(body));
aoqi@0:             genFinalizer(env);
aoqi@0:             code.statBegin(TreeInfo.endPos(env.tree));
aoqi@0:             Chain exitChain = code.branch(goto_);
aoqi@0:             endFinalizerGap(env);
aoqi@0:             if (startpc != endpc) for (List<JCCatch> l = catchers; l.nonEmpty(); l = l.tail) {
aoqi@0:                 // start off with exception on stack
aoqi@0:                 code.entryPoint(stateTry, l.head.param.sym.type);
aoqi@0:                 genCatch(l.head, env, startpc, endpc, gaps);
aoqi@0:                 genFinalizer(env);
aoqi@0:                 if (hasFinalizer || l.tail.nonEmpty()) {
aoqi@0:                     code.statBegin(TreeInfo.endPos(env.tree));
aoqi@0:                     exitChain = Code.mergeChains(exitChain,
aoqi@0:                                                  code.branch(goto_));
aoqi@0:                 }
aoqi@0:                 endFinalizerGap(env);
aoqi@0:             }
aoqi@0:             if (hasFinalizer) {
aoqi@0:                 // Create a new register segement to avoid allocating
aoqi@0:                 // the same variables in finalizers and other statements.
aoqi@0:                 code.newRegSegment();
aoqi@0: 
aoqi@0:                 // Add a catch-all clause.
aoqi@0: 
aoqi@0:                 // start off with exception on stack
aoqi@0:                 int catchallpc = code.entryPoint(stateTry, syms.throwableType);
aoqi@0: 
aoqi@0:                 // Register all exception ranges for catch all clause.
aoqi@0:                 // The range of the catch all clause is from the beginning
aoqi@0:                 // of the try or synchronized block until the present
aoqi@0:                 // code pointer excluding all gaps in the current
aoqi@0:                 // environment's GenContext.
aoqi@0:                 int startseg = startpc;
aoqi@0:                 while (env.info.gaps.nonEmpty()) {
aoqi@0:                     int endseg = env.info.gaps.next().intValue();
aoqi@0:                     registerCatch(body.pos(), startseg, endseg,
aoqi@0:                                   catchallpc, 0);
aoqi@0:                     startseg = env.info.gaps.next().intValue();
aoqi@0:                 }
shshahma@3371:                 code.statBegin(TreeInfo.finalizerPos(env.tree, PosKind.FIRST_STAT_POS));
aoqi@0:                 code.markStatBegin();
aoqi@0: 
aoqi@0:                 Item excVar = makeTemp(syms.throwableType);
aoqi@0:                 excVar.store();
aoqi@0:                 genFinalizer(env);
shshahma@3371:                 code.resolvePending();
shshahma@3371:                 code.statBegin(TreeInfo.finalizerPos(env.tree, PosKind.END_POS));
shshahma@3371:                 code.markStatBegin();
shshahma@3371: 
aoqi@0:                 excVar.load();
aoqi@0:                 registerCatch(body.pos(), startseg,
aoqi@0:                               env.info.gaps.next().intValue(),
aoqi@0:                               catchallpc, 0);
aoqi@0:                 code.emitop0(athrow);
aoqi@0:                 code.markDead();
aoqi@0: 
aoqi@0:                 // If there are jsr's to this finalizer, ...
aoqi@0:                 if (env.info.cont != null) {
aoqi@0:                     // Resolve all jsr's.
aoqi@0:                     code.resolve(env.info.cont);
aoqi@0: 
aoqi@0:                     // Mark statement line number
shshahma@3371:                     code.statBegin(TreeInfo.finalizerPos(env.tree, PosKind.FIRST_STAT_POS));
aoqi@0:                     code.markStatBegin();
aoqi@0: 
aoqi@0:                     // Save return address.
aoqi@0:                     LocalItem retVar = makeTemp(syms.throwableType);
aoqi@0:                     retVar.store();
aoqi@0: 
aoqi@0:                     // Generate finalizer code.
aoqi@0:                     env.info.finalize.genLast();
aoqi@0: 
aoqi@0:                     // Return.
aoqi@0:                     code.emitop1w(ret, retVar.reg);
aoqi@0:                     code.markDead();
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             // Resolve all breaks.
aoqi@0:             code.resolve(exitChain);
aoqi@0: 
aoqi@0:             code.endScopes(limit);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Generate code for a catch clause.
aoqi@0:          *  @param tree     The catch clause.
aoqi@0:          *  @param env      The environment current in the enclosing try.
aoqi@0:          *  @param startpc  Start pc of try-block.
aoqi@0:          *  @param endpc    End pc of try-block.
aoqi@0:          */
aoqi@0:         void genCatch(JCCatch tree,
aoqi@0:                       Env<GenContext> env,
aoqi@0:                       int startpc, int endpc,
aoqi@0:                       List<Integer> gaps) {
aoqi@0:             if (startpc != endpc) {
aoqi@0:                 List<JCExpression> subClauses = TreeInfo.isMultiCatch(tree) ?
aoqi@0:                         ((JCTypeUnion)tree.param.vartype).alternatives :
aoqi@0:                         List.of(tree.param.vartype);
aoqi@0:                 while (gaps.nonEmpty()) {
aoqi@0:                     for (JCExpression subCatch : subClauses) {
aoqi@0:                         int catchType = makeRef(tree.pos(), subCatch.type);
aoqi@0:                         int end = gaps.head.intValue();
aoqi@0:                         registerCatch(tree.pos(),
aoqi@0:                                       startpc,  end, code.curCP(),
aoqi@0:                                       catchType);
aoqi@0:                         if (subCatch.type.isAnnotated()) {
aoqi@0:                             for (Attribute.TypeCompound tc :
aoqi@0:                                      subCatch.type.getAnnotationMirrors()) {
aoqi@0:                                 tc.position.type_index = catchType;
aoqi@0:                             }
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                     gaps = gaps.tail;
aoqi@0:                     startpc = gaps.head.intValue();
aoqi@0:                     gaps = gaps.tail;
aoqi@0:                 }
aoqi@0:                 if (startpc < endpc) {
aoqi@0:                     for (JCExpression subCatch : subClauses) {
aoqi@0:                         int catchType = makeRef(tree.pos(), subCatch.type);
aoqi@0:                         registerCatch(tree.pos(),
aoqi@0:                                       startpc, endpc, code.curCP(),
aoqi@0:                                       catchType);
aoqi@0:                         if (subCatch.type.isAnnotated()) {
aoqi@0:                             for (Attribute.TypeCompound tc :
aoqi@0:                                      subCatch.type.getAnnotationMirrors()) {
aoqi@0:                                 tc.position.type_index = catchType;
aoqi@0:                             }
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 VarSymbol exparam = tree.param.sym;
aoqi@0:                 code.statBegin(tree.pos);
aoqi@0:                 code.markStatBegin();
aoqi@0:                 int limit = code.nextreg;
aoqi@0:                 int exlocal = code.newLocal(exparam);
aoqi@0:                 items.makeLocalItem(exparam).store();
aoqi@0:                 code.statBegin(TreeInfo.firstStatPos(tree.body));
aoqi@0:                 genStat(tree.body, env, CRT_BLOCK);
aoqi@0:                 code.endScopes(limit);
aoqi@0:                 code.statBegin(TreeInfo.endPos(tree.body));
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Register a catch clause in the "Exceptions" code-attribute.
aoqi@0:          */
aoqi@0:         void registerCatch(DiagnosticPosition pos,
aoqi@0:                            int startpc, int endpc,
aoqi@0:                            int handler_pc, int catch_type) {
aoqi@0:             char startpc1 = (char)startpc;
aoqi@0:             char endpc1 = (char)endpc;
aoqi@0:             char handler_pc1 = (char)handler_pc;
aoqi@0:             if (startpc1 == startpc &&
aoqi@0:                 endpc1 == endpc &&
aoqi@0:                 handler_pc1 == handler_pc) {
aoqi@0:                 code.addCatch(startpc1, endpc1, handler_pc1,
aoqi@0:                               (char)catch_type);
aoqi@0:             } else {
aoqi@0:                 if (!useJsrLocally && !target.generateStackMapTable()) {
aoqi@0:                     useJsrLocally = true;
aoqi@0:                     throw new CodeSizeOverflow();
aoqi@0:                 } else {
aoqi@0:                     log.error(pos, "limit.code.too.large.for.try.stmt");
aoqi@0:                     nerrs++;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:     /** Very roughly estimate the number of instructions needed for
aoqi@0:      *  the given tree.
aoqi@0:      */
aoqi@0:     int estimateCodeComplexity(JCTree tree) {
aoqi@0:         if (tree == null) return 0;
aoqi@0:         class ComplexityScanner extends TreeScanner {
aoqi@0:             int complexity = 0;
aoqi@0:             public void scan(JCTree tree) {
aoqi@0:                 if (complexity > jsrlimit) return;
aoqi@0:                 super.scan(tree);
aoqi@0:             }
aoqi@0:             public void visitClassDef(JCClassDecl tree) {}
aoqi@0:             public void visitDoLoop(JCDoWhileLoop tree)
aoqi@0:                 { super.visitDoLoop(tree); complexity++; }
aoqi@0:             public void visitWhileLoop(JCWhileLoop tree)
aoqi@0:                 { super.visitWhileLoop(tree); complexity++; }
aoqi@0:             public void visitForLoop(JCForLoop tree)
aoqi@0:                 { super.visitForLoop(tree); complexity++; }
aoqi@0:             public void visitSwitch(JCSwitch tree)
aoqi@0:                 { super.visitSwitch(tree); complexity+=5; }
aoqi@0:             public void visitCase(JCCase tree)
aoqi@0:                 { super.visitCase(tree); complexity++; }
aoqi@0:             public void visitSynchronized(JCSynchronized tree)
aoqi@0:                 { super.visitSynchronized(tree); complexity+=6; }
aoqi@0:             public void visitTry(JCTry tree)
aoqi@0:                 { super.visitTry(tree);
aoqi@0:                   if (tree.finalizer != null) complexity+=6; }
aoqi@0:             public void visitCatch(JCCatch tree)
aoqi@0:                 { super.visitCatch(tree); complexity+=2; }
aoqi@0:             public void visitConditional(JCConditional tree)
aoqi@0:                 { super.visitConditional(tree); complexity+=2; }
aoqi@0:             public void visitIf(JCIf tree)
aoqi@0:                 { super.visitIf(tree); complexity+=2; }
aoqi@0:             // note: for break, continue, and return we don't take unwind() into account.
aoqi@0:             public void visitBreak(JCBreak tree)
aoqi@0:                 { super.visitBreak(tree); complexity+=1; }
aoqi@0:             public void visitContinue(JCContinue tree)
aoqi@0:                 { super.visitContinue(tree); complexity+=1; }
aoqi@0:             public void visitReturn(JCReturn tree)
aoqi@0:                 { super.visitReturn(tree); complexity+=1; }
aoqi@0:             public void visitThrow(JCThrow tree)
aoqi@0:                 { super.visitThrow(tree); complexity+=1; }
aoqi@0:             public void visitAssert(JCAssert tree)
aoqi@0:                 { super.visitAssert(tree); complexity+=5; }
aoqi@0:             public void visitApply(JCMethodInvocation tree)
aoqi@0:                 { super.visitApply(tree); complexity+=2; }
aoqi@0:             public void visitNewClass(JCNewClass tree)
aoqi@0:                 { scan(tree.encl); scan(tree.args); complexity+=2; }
aoqi@0:             public void visitNewArray(JCNewArray tree)
aoqi@0:                 { super.visitNewArray(tree); complexity+=5; }
aoqi@0:             public void visitAssign(JCAssign tree)
aoqi@0:                 { super.visitAssign(tree); complexity+=1; }
aoqi@0:             public void visitAssignop(JCAssignOp tree)
aoqi@0:                 { super.visitAssignop(tree); complexity+=2; }
aoqi@0:             public void visitUnary(JCUnary tree)
aoqi@0:                 { complexity+=1;
aoqi@0:                   if (tree.type.constValue() == null) super.visitUnary(tree); }
aoqi@0:             public void visitBinary(JCBinary tree)
aoqi@0:                 { complexity+=1;
aoqi@0:                   if (tree.type.constValue() == null) super.visitBinary(tree); }
aoqi@0:             public void visitTypeTest(JCInstanceOf tree)
aoqi@0:                 { super.visitTypeTest(tree); complexity+=1; }
aoqi@0:             public void visitIndexed(JCArrayAccess tree)
aoqi@0:                 { super.visitIndexed(tree); complexity+=1; }
aoqi@0:             public void visitSelect(JCFieldAccess tree)
aoqi@0:                 { super.visitSelect(tree);
aoqi@0:                   if (tree.sym.kind == VAR) complexity+=1; }
aoqi@0:             public void visitIdent(JCIdent tree) {
aoqi@0:                 if (tree.sym.kind == VAR) {
aoqi@0:                     complexity+=1;
aoqi@0:                     if (tree.type.constValue() == null &&
aoqi@0:                         tree.sym.owner.kind == TYP)
aoqi@0:                         complexity+=1;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             public void visitLiteral(JCLiteral tree)
aoqi@0:                 { complexity+=1; }
aoqi@0:             public void visitTree(JCTree tree) {}
aoqi@0:             public void visitWildcard(JCWildcard tree) {
aoqi@0:                 throw new AssertionError(this.getClass().getName());
aoqi@0:             }
aoqi@0:         }
aoqi@0:         ComplexityScanner scanner = new ComplexityScanner();
aoqi@0:         tree.accept(scanner);
aoqi@0:         return scanner.complexity;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitIf(JCIf tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         Chain thenExit = null;
aoqi@0:         CondItem c = genCond(TreeInfo.skipParens(tree.cond),
aoqi@0:                              CRT_FLOW_CONTROLLER);
aoqi@0:         Chain elseChain = c.jumpFalse();
aoqi@0:         if (!c.isFalse()) {
aoqi@0:             code.resolve(c.trueJumps);
aoqi@0:             genStat(tree.thenpart, env, CRT_STATEMENT | CRT_FLOW_TARGET);
aoqi@0:             thenExit = code.branch(goto_);
aoqi@0:         }
aoqi@0:         if (elseChain != null) {
aoqi@0:             code.resolve(elseChain);
aoqi@0:             if (tree.elsepart != null) {
aoqi@0:                 genStat(tree.elsepart, env,CRT_STATEMENT | CRT_FLOW_TARGET);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         code.resolve(thenExit);
aoqi@0:         code.endScopes(limit);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitExec(JCExpressionStatement tree) {
aoqi@0:         // Optimize x++ to ++x and x-- to --x.
aoqi@0:         JCExpression e = tree.expr;
aoqi@0:         switch (e.getTag()) {
aoqi@0:             case POSTINC:
aoqi@0:                 ((JCUnary) e).setTag(PREINC);
aoqi@0:                 break;
aoqi@0:             case POSTDEC:
aoqi@0:                 ((JCUnary) e).setTag(PREDEC);
aoqi@0:                 break;
aoqi@0:         }
aoqi@0:         genExpr(tree.expr, tree.expr.type).drop();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitBreak(JCBreak tree) {
aoqi@0:         Env<GenContext> targetEnv = unwind(tree.target, env);
aoqi@0:         Assert.check(code.state.stacksize == 0);
aoqi@0:         targetEnv.info.addExit(code.branch(goto_));
aoqi@0:         endFinalizerGaps(env, targetEnv);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitContinue(JCContinue tree) {
aoqi@0:         Env<GenContext> targetEnv = unwind(tree.target, env);
aoqi@0:         Assert.check(code.state.stacksize == 0);
aoqi@0:         targetEnv.info.addCont(code.branch(goto_));
aoqi@0:         endFinalizerGaps(env, targetEnv);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitReturn(JCReturn tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         final Env<GenContext> targetEnv;
aeriksso@3000: 
aeriksso@3000:         /* Save and then restore the location of the return in case a finally
aeriksso@3000:          * is expanded (with unwind()) in the middle of our bytecodes.
aeriksso@3000:          */
aeriksso@3000:         int tmpPos = code.pendingStatPos;
aoqi@0:         if (tree.expr != null) {
aoqi@0:             Item r = genExpr(tree.expr, pt).load();
aoqi@0:             if (hasFinally(env.enclMethod, env)) {
aoqi@0:                 r = makeTemp(pt);
aoqi@0:                 r.store();
aoqi@0:             }
aoqi@0:             targetEnv = unwind(env.enclMethod, env);
aeriksso@3000:             code.pendingStatPos = tmpPos;
aoqi@0:             r.load();
aoqi@0:             code.emitop0(ireturn + Code.truncate(Code.typecode(pt)));
aoqi@0:         } else {
aoqi@0:             targetEnv = unwind(env.enclMethod, env);
aoqi@0:             code.pendingStatPos = tmpPos;
aoqi@0:             code.emitop0(return_);
aoqi@0:         }
aoqi@0:         endFinalizerGaps(env, targetEnv);
aoqi@0:         code.endScopes(limit);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitThrow(JCThrow tree) {
aoqi@0:         genExpr(tree.expr, tree.expr.type).load();
aoqi@0:         code.emitop0(athrow);
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Visitor methods for expressions
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     public void visitApply(JCMethodInvocation tree) {
aoqi@0:         setTypeAnnotationPositions(tree.pos);
aoqi@0:         // Generate code for method.
aoqi@0:         Item m = genExpr(tree.meth, methodType);
aoqi@0:         // Generate code for all arguments, where the expected types are
aoqi@0:         // the parameters of the method's external type (that is, any implicit
aoqi@0:         // outer instance of a super(...) call appears as first parameter).
aoqi@0:         MethodSymbol msym = (MethodSymbol)TreeInfo.symbol(tree.meth);
aoqi@0:         genArgs(tree.args,
aoqi@0:                 msym.externalType(types).getParameterTypes());
aoqi@0:         if (!msym.isDynamic()) {
aoqi@0:             code.statBegin(tree.pos);
aoqi@0:         }
aoqi@0:         result = m.invoke();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitConditional(JCConditional tree) {
aoqi@0:         Chain thenExit = null;
aoqi@0:         CondItem c = genCond(tree.cond, CRT_FLOW_CONTROLLER);
aoqi@0:         Chain elseChain = c.jumpFalse();
aoqi@0:         if (!c.isFalse()) {
aoqi@0:             code.resolve(c.trueJumps);
aoqi@0:             int startpc = genCrt ? code.curCP() : 0;
aoqi@0:             genExpr(tree.truepart, pt).load();
aoqi@0:             code.state.forceStackTop(tree.type);
aoqi@0:             if (genCrt) code.crt.put(tree.truepart, CRT_FLOW_TARGET,
aoqi@0:                                      startpc, code.curCP());
aoqi@0:             thenExit = code.branch(goto_);
aoqi@0:         }
aoqi@0:         if (elseChain != null) {
aoqi@0:             code.resolve(elseChain);
aoqi@0:             int startpc = genCrt ? code.curCP() : 0;
aoqi@0:             genExpr(tree.falsepart, pt).load();
aoqi@0:             code.state.forceStackTop(tree.type);
aoqi@0:             if (genCrt) code.crt.put(tree.falsepart, CRT_FLOW_TARGET,
aoqi@0:                                      startpc, code.curCP());
aoqi@0:         }
aoqi@0:         code.resolve(thenExit);
aoqi@0:         result = items.makeStackItem(pt);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private void setTypeAnnotationPositions(int treePos) {
aoqi@0:         MethodSymbol meth = code.meth;
aoqi@0:         boolean initOrClinit = code.meth.getKind() == javax.lang.model.element.ElementKind.CONSTRUCTOR
aoqi@0:                 || code.meth.getKind() == javax.lang.model.element.ElementKind.STATIC_INIT;
aoqi@0: 
aoqi@0:         for (Attribute.TypeCompound ta : meth.getRawTypeAttributes()) {
aoqi@0:             if (ta.hasUnknownPosition())
aoqi@0:                 ta.tryFixPosition();
aoqi@0: 
aoqi@0:             if (ta.position.matchesPos(treePos))
aoqi@0:                 ta.position.updatePosOffset(code.cp);
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (!initOrClinit)
aoqi@0:             return;
aoqi@0: 
aoqi@0:         for (Attribute.TypeCompound ta : meth.owner.getRawTypeAttributes()) {
aoqi@0:             if (ta.hasUnknownPosition())
aoqi@0:                 ta.tryFixPosition();
aoqi@0: 
aoqi@0:             if (ta.position.matchesPos(treePos))
aoqi@0:                 ta.position.updatePosOffset(code.cp);
aoqi@0:         }
aoqi@0: 
aoqi@0:         ClassSymbol clazz = meth.enclClass();
aoqi@0:         for (Symbol s : new com.sun.tools.javac.model.FilteredMemberList(clazz.members())) {
aoqi@0:             if (!s.getKind().isField())
aoqi@0:                 continue;
aoqi@0: 
aoqi@0:             for (Attribute.TypeCompound ta : s.getRawTypeAttributes()) {
aoqi@0:                 if (ta.hasUnknownPosition())
aoqi@0:                     ta.tryFixPosition();
aoqi@0: 
aoqi@0:                 if (ta.position.matchesPos(treePos))
aoqi@0:                     ta.position.updatePosOffset(code.cp);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitNewClass(JCNewClass tree) {
aoqi@0:         // Enclosing instances or anonymous classes should have been eliminated
aoqi@0:         // by now.
aoqi@0:         Assert.check(tree.encl == null && tree.def == null);
aoqi@0:         setTypeAnnotationPositions(tree.pos);
aoqi@0: 
aoqi@0:         code.emitop2(new_, makeRef(tree.pos(), tree.type));
aoqi@0:         code.emitop0(dup);
aoqi@0: 
aoqi@0:         // Generate code for all arguments, where the expected types are
aoqi@0:         // the parameters of the constructor's external type (that is,
aoqi@0:         // any implicit outer instance appears as first parameter).
aoqi@0:         genArgs(tree.args, tree.constructor.externalType(types).getParameterTypes());
aoqi@0: 
aoqi@0:         items.makeMemberItem(tree.constructor, true).invoke();
aoqi@0:         result = items.makeStackItem(tree.type);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitNewArray(JCNewArray tree) {
aoqi@0:         setTypeAnnotationPositions(tree.pos);
aoqi@0: 
aoqi@0:         if (tree.elems != null) {
aoqi@0:             Type elemtype = types.elemtype(tree.type);
aoqi@0:             loadIntConst(tree.elems.length());
aoqi@0:             Item arr = makeNewArray(tree.pos(), tree.type, 1);
aoqi@0:             int i = 0;
aoqi@0:             for (List<JCExpression> l = tree.elems; l.nonEmpty(); l = l.tail) {
aoqi@0:                 arr.duplicate();
aoqi@0:                 loadIntConst(i);
aoqi@0:                 i++;
aoqi@0:                 genExpr(l.head, elemtype).load();
aoqi@0:                 items.makeIndexedItem(elemtype).store();
aoqi@0:             }
aoqi@0:             result = arr;
aoqi@0:         } else {
aoqi@0:             for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
aoqi@0:                 genExpr(l.head, syms.intType).load();
aoqi@0:             }
aoqi@0:             result = makeNewArray(tree.pos(), tree.type, tree.dims.length());
aoqi@0:         }
aoqi@0:     }
aoqi@0: //where
aoqi@0:         /** Generate code to create an array with given element type and number
aoqi@0:          *  of dimensions.
aoqi@0:          */
aoqi@0:         Item makeNewArray(DiagnosticPosition pos, Type type, int ndims) {
aoqi@0:             Type elemtype = types.elemtype(type);
aoqi@0:             if (types.dimensions(type) > ClassFile.MAX_DIMENSIONS) {
aoqi@0:                 log.error(pos, "limit.dimensions");
aoqi@0:                 nerrs++;
aoqi@0:             }
aoqi@0:             int elemcode = Code.arraycode(elemtype);
aoqi@0:             if (elemcode == 0 || (elemcode == 1 && ndims == 1)) {
aoqi@0:                 code.emitAnewarray(makeRef(pos, elemtype), type);
aoqi@0:             } else if (elemcode == 1) {
aoqi@0:                 code.emitMultianewarray(ndims, makeRef(pos, type), type);
aoqi@0:             } else {
aoqi@0:                 code.emitNewarray(elemcode, type);
aoqi@0:             }
aoqi@0:             return items.makeStackItem(type);
aoqi@0:         }
aoqi@0: 
aoqi@0:     public void visitParens(JCParens tree) {
aoqi@0:         result = genExpr(tree.expr, tree.expr.type);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitAssign(JCAssign tree) {
aoqi@0:         Item l = genExpr(tree.lhs, tree.lhs.type);
aoqi@0:         genExpr(tree.rhs, tree.lhs.type).load();
aoqi@0:         result = items.makeAssignItem(l);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitAssignop(JCAssignOp tree) {
aoqi@0:         OperatorSymbol operator = (OperatorSymbol) tree.operator;
aoqi@0:         Item l;
aoqi@0:         if (operator.opcode == string_add) {
aoqi@0:             // Generate code to make a string buffer
aoqi@0:             makeStringBuffer(tree.pos());
aoqi@0: 
aoqi@0:             // Generate code for first string, possibly save one
aoqi@0:             // copy under buffer
aoqi@0:             l = genExpr(tree.lhs, tree.lhs.type);
aoqi@0:             if (l.width() > 0) {
aoqi@0:                 code.emitop0(dup_x1 + 3 * (l.width() - 1));
aoqi@0:             }
aoqi@0: 
aoqi@0:             // Load first string and append to buffer.
aoqi@0:             l.load();
aoqi@0:             appendString(tree.lhs);
aoqi@0: 
aoqi@0:             // Append all other strings to buffer.
aoqi@0:             appendStrings(tree.rhs);
aoqi@0: 
aoqi@0:             // Convert buffer to string.
aoqi@0:             bufferToString(tree.pos());
aoqi@0:         } else {
aoqi@0:             // Generate code for first expression
aoqi@0:             l = genExpr(tree.lhs, tree.lhs.type);
aoqi@0: 
aoqi@0:             // If we have an increment of -32768 to +32767 of a local
aoqi@0:             // int variable we can use an incr instruction instead of
aoqi@0:             // proceeding further.
aoqi@0:             if ((tree.hasTag(PLUS_ASG) || tree.hasTag(MINUS_ASG)) &&
aoqi@0:                 l instanceof LocalItem &&
aoqi@0:                 tree.lhs.type.getTag().isSubRangeOf(INT) &&
aoqi@0:                 tree.rhs.type.getTag().isSubRangeOf(INT) &&
aoqi@0:                 tree.rhs.type.constValue() != null) {
aoqi@0:                 int ival = ((Number) tree.rhs.type.constValue()).intValue();
aoqi@0:                 if (tree.hasTag(MINUS_ASG)) ival = -ival;
aoqi@0:                 ((LocalItem)l).incr(ival);
aoqi@0:                 result = l;
aoqi@0:                 return;
aoqi@0:             }
aoqi@0:             // Otherwise, duplicate expression, load one copy
aoqi@0:             // and complete binary operation.
aoqi@0:             l.duplicate();
aoqi@0:             l.coerce(operator.type.getParameterTypes().head).load();
aoqi@0:             completeBinop(tree.lhs, tree.rhs, operator).coerce(tree.lhs.type);
aoqi@0:         }
aoqi@0:         result = items.makeAssignItem(l);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitUnary(JCUnary tree) {
aoqi@0:         OperatorSymbol operator = (OperatorSymbol)tree.operator;
aoqi@0:         if (tree.hasTag(NOT)) {
aoqi@0:             CondItem od = genCond(tree.arg, false);
aoqi@0:             result = od.negate();
aoqi@0:         } else {
aoqi@0:             Item od = genExpr(tree.arg, operator.type.getParameterTypes().head);
aoqi@0:             switch (tree.getTag()) {
aoqi@0:             case POS:
aoqi@0:                 result = od.load();
aoqi@0:                 break;
aoqi@0:             case NEG:
aoqi@0:                 result = od.load();
aoqi@0:                 code.emitop0(operator.opcode);
aoqi@0:                 break;
aoqi@0:             case COMPL:
aoqi@0:                 result = od.load();
aoqi@0:                 emitMinusOne(od.typecode);
aoqi@0:                 code.emitop0(operator.opcode);
aoqi@0:                 break;
aoqi@0:             case PREINC: case PREDEC:
aoqi@0:                 od.duplicate();
aoqi@0:                 if (od instanceof LocalItem &&
aoqi@0:                     (operator.opcode == iadd || operator.opcode == isub)) {
aoqi@0:                     ((LocalItem)od).incr(tree.hasTag(PREINC) ? 1 : -1);
aoqi@0:                     result = od;
aoqi@0:                 } else {
aoqi@0:                     od.load();
aoqi@0:                     code.emitop0(one(od.typecode));
aoqi@0:                     code.emitop0(operator.opcode);
aoqi@0:                     // Perform narrowing primitive conversion if byte,
aoqi@0:                     // char, or short.  Fix for 4304655.
aoqi@0:                     if (od.typecode != INTcode &&
aoqi@0:                         Code.truncate(od.typecode) == INTcode)
aoqi@0:                       code.emitop0(int2byte + od.typecode - BYTEcode);
aoqi@0:                     result = items.makeAssignItem(od);
aoqi@0:                 }
aoqi@0:                 break;
aoqi@0:             case POSTINC: case POSTDEC:
aoqi@0:                 od.duplicate();
aoqi@0:                 if (od instanceof LocalItem &&
aoqi@0:                     (operator.opcode == iadd || operator.opcode == isub)) {
aoqi@0:                     Item res = od.load();
aoqi@0:                     ((LocalItem)od).incr(tree.hasTag(POSTINC) ? 1 : -1);
aoqi@0:                     result = res;
aoqi@0:                 } else {
aoqi@0:                     Item res = od.load();
aoqi@0:                     od.stash(od.typecode);
aoqi@0:                     code.emitop0(one(od.typecode));
aoqi@0:                     code.emitop0(operator.opcode);
aoqi@0:                     // Perform narrowing primitive conversion if byte,
aoqi@0:                     // char, or short.  Fix for 4304655.
aoqi@0:                     if (od.typecode != INTcode &&
aoqi@0:                         Code.truncate(od.typecode) == INTcode)
aoqi@0:                       code.emitop0(int2byte + od.typecode - BYTEcode);
aoqi@0:                     od.store();
aoqi@0:                     result = res;
aoqi@0:                 }
aoqi@0:                 break;
aoqi@0:             case NULLCHK:
aoqi@0:                 result = od.load();
aoqi@0:                 code.emitop0(dup);
aoqi@0:                 genNullCheck(tree.pos());
aoqi@0:                 break;
aoqi@0:             default:
aoqi@0:                 Assert.error();
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Generate a null check from the object value at stack top. */
aoqi@0:     private void genNullCheck(DiagnosticPosition pos) {
aoqi@0:         callMethod(pos, syms.objectType, names.getClass,
aoqi@0:                    List.<Type>nil(), false);
aoqi@0:         code.emitop0(pop);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitBinary(JCBinary tree) {
aoqi@0:         OperatorSymbol operator = (OperatorSymbol)tree.operator;
aoqi@0:         if (operator.opcode == string_add) {
aoqi@0:             // Create a string buffer.
aoqi@0:             makeStringBuffer(tree.pos());
aoqi@0:             // Append all strings to buffer.
aoqi@0:             appendStrings(tree);
aoqi@0:             // Convert buffer to string.
aoqi@0:             bufferToString(tree.pos());
aoqi@0:             result = items.makeStackItem(syms.stringType);
aoqi@0:         } else if (tree.hasTag(AND)) {
aoqi@0:             CondItem lcond = genCond(tree.lhs, CRT_FLOW_CONTROLLER);
aoqi@0:             if (!lcond.isFalse()) {
aoqi@0:                 Chain falseJumps = lcond.jumpFalse();
aoqi@0:                 code.resolve(lcond.trueJumps);
aoqi@0:                 CondItem rcond = genCond(tree.rhs, CRT_FLOW_TARGET);
aoqi@0:                 result = items.
aoqi@0:                     makeCondItem(rcond.opcode,
aoqi@0:                                  rcond.trueJumps,
aoqi@0:                                  Code.mergeChains(falseJumps,
aoqi@0:                                                   rcond.falseJumps));
aoqi@0:             } else {
aoqi@0:                 result = lcond;
aoqi@0:             }
aoqi@0:         } else if (tree.hasTag(OR)) {
aoqi@0:             CondItem lcond = genCond(tree.lhs, CRT_FLOW_CONTROLLER);
aoqi@0:             if (!lcond.isTrue()) {
aoqi@0:                 Chain trueJumps = lcond.jumpTrue();
aoqi@0:                 code.resolve(lcond.falseJumps);
aoqi@0:                 CondItem rcond = genCond(tree.rhs, CRT_FLOW_TARGET);
aoqi@0:                 result = items.
aoqi@0:                     makeCondItem(rcond.opcode,
aoqi@0:                                  Code.mergeChains(trueJumps, rcond.trueJumps),
aoqi@0:                                  rcond.falseJumps);
aoqi@0:             } else {
aoqi@0:                 result = lcond;
aoqi@0:             }
aoqi@0:         } else {
aoqi@0:             Item od = genExpr(tree.lhs, operator.type.getParameterTypes().head);
aoqi@0:             od.load();
aoqi@0:             result = completeBinop(tree.lhs, tree.rhs, operator);
aoqi@0:         }
aoqi@0:     }
aoqi@0: //where
aoqi@0:         /** Make a new string buffer.
aoqi@0:          */
aoqi@0:         void makeStringBuffer(DiagnosticPosition pos) {
aoqi@0:             code.emitop2(new_, makeRef(pos, stringBufferType));
aoqi@0:             code.emitop0(dup);
aoqi@0:             callMethod(
aoqi@0:                 pos, stringBufferType, names.init, List.<Type>nil(), false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Append value (on tos) to string buffer (on tos - 1).
aoqi@0:          */
aoqi@0:         void appendString(JCTree tree) {
aoqi@0:             Type t = tree.type.baseType();
aoqi@0:             if (!t.isPrimitive() && t.tsym != syms.stringType.tsym) {
aoqi@0:                 t = syms.objectType;
aoqi@0:             }
aoqi@0:             items.makeMemberItem(getStringBufferAppend(tree, t), false).invoke();
aoqi@0:         }
aoqi@0:         Symbol getStringBufferAppend(JCTree tree, Type t) {
aoqi@0:             Assert.checkNull(t.constValue());
aoqi@0:             Symbol method = stringBufferAppend.get(t);
aoqi@0:             if (method == null) {
aoqi@0:                 method = rs.resolveInternalMethod(tree.pos(),
aoqi@0:                                                   attrEnv,
aoqi@0:                                                   stringBufferType,
aoqi@0:                                                   names.append,
aoqi@0:                                                   List.of(t),
aoqi@0:                                                   null);
aoqi@0:                 stringBufferAppend.put(t, method);
aoqi@0:             }
aoqi@0:             return method;
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Add all strings in tree to string buffer.
aoqi@0:          */
aoqi@0:         void appendStrings(JCTree tree) {
aoqi@0:             tree = TreeInfo.skipParens(tree);
aoqi@0:             if (tree.hasTag(PLUS) && tree.type.constValue() == null) {
aoqi@0:                 JCBinary op = (JCBinary) tree;
aoqi@0:                 if (op.operator.kind == MTH &&
aoqi@0:                     ((OperatorSymbol) op.operator).opcode == string_add) {
aoqi@0:                     appendStrings(op.lhs);
aoqi@0:                     appendStrings(op.rhs);
aoqi@0:                     return;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             genExpr(tree, tree.type).load();
aoqi@0:             appendString(tree);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Convert string buffer on tos to string.
aoqi@0:          */
aoqi@0:         void bufferToString(DiagnosticPosition pos) {
aoqi@0:             callMethod(
aoqi@0:                 pos,
aoqi@0:                 stringBufferType,
aoqi@0:                 names.toString,
aoqi@0:                 List.<Type>nil(),
aoqi@0:                 false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Complete generating code for operation, with left operand
aoqi@0:          *  already on stack.
aoqi@0:          *  @param lhs       The tree representing the left operand.
aoqi@0:          *  @param rhs       The tree representing the right operand.
aoqi@0:          *  @param operator  The operator symbol.
aoqi@0:          */
aoqi@0:         Item completeBinop(JCTree lhs, JCTree rhs, OperatorSymbol operator) {
aoqi@0:             MethodType optype = (MethodType)operator.type;
aoqi@0:             int opcode = operator.opcode;
aoqi@0:             if (opcode >= if_icmpeq && opcode <= if_icmple &&
aoqi@0:                 rhs.type.constValue() instanceof Number &&
aoqi@0:                 ((Number) rhs.type.constValue()).intValue() == 0) {
aoqi@0:                 opcode = opcode + (ifeq - if_icmpeq);
aoqi@0:             } else if (opcode >= if_acmpeq && opcode <= if_acmpne &&
aoqi@0:                        TreeInfo.isNull(rhs)) {
aoqi@0:                 opcode = opcode + (if_acmp_null - if_acmpeq);
aoqi@0:             } else {
aoqi@0:                 // The expected type of the right operand is
aoqi@0:                 // the second parameter type of the operator, except for
aoqi@0:                 // shifts with long shiftcount, where we convert the opcode
aoqi@0:                 // to a short shift and the expected type to int.
aoqi@0:                 Type rtype = operator.erasure(types).getParameterTypes().tail.head;
aoqi@0:                 if (opcode >= ishll && opcode <= lushrl) {
aoqi@0:                     opcode = opcode + (ishl - ishll);
aoqi@0:                     rtype = syms.intType;
aoqi@0:                 }
aoqi@0:                 // Generate code for right operand and load.
aoqi@0:                 genExpr(rhs, rtype).load();
aoqi@0:                 // If there are two consecutive opcode instructions,
aoqi@0:                 // emit the first now.
aoqi@0:                 if (opcode >= (1 << preShift)) {
aoqi@0:                     code.emitop0(opcode >> preShift);
aoqi@0:                     opcode = opcode & 0xFF;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (opcode >= ifeq && opcode <= if_acmpne ||
aoqi@0:                 opcode == if_acmp_null || opcode == if_acmp_nonnull) {
aoqi@0:                 return items.makeCondItem(opcode);
aoqi@0:             } else {
aoqi@0:                 code.emitop0(opcode);
aoqi@0:                 return items.makeStackItem(optype.restype);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:     public void visitTypeCast(JCTypeCast tree) {
aoqi@0:         setTypeAnnotationPositions(tree.pos);
aoqi@0:         result = genExpr(tree.expr, tree.clazz.type).load();
aoqi@0:         // Additional code is only needed if we cast to a reference type
aoqi@0:         // which is not statically a supertype of the expression's type.
aoqi@0:         // For basic types, the coerce(...) in genExpr(...) will do
aoqi@0:         // the conversion.
aoqi@0:         if (!tree.clazz.type.isPrimitive() &&
aoqi@0:             types.asSuper(tree.expr.type, tree.clazz.type.tsym) == null) {
aoqi@0:             code.emitop2(checkcast, makeRef(tree.pos(), tree.clazz.type));
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitWildcard(JCWildcard tree) {
aoqi@0:         throw new AssertionError(this.getClass().getName());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitTypeTest(JCInstanceOf tree) {
aoqi@0:         setTypeAnnotationPositions(tree.pos);
aoqi@0:         genExpr(tree.expr, tree.expr.type).load();
aoqi@0:         code.emitop2(instanceof_, makeRef(tree.pos(), tree.clazz.type));
aoqi@0:         result = items.makeStackItem(syms.booleanType);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitIndexed(JCArrayAccess tree) {
aoqi@0:         genExpr(tree.indexed, tree.indexed.type).load();
aoqi@0:         genExpr(tree.index, syms.intType).load();
aoqi@0:         result = items.makeIndexedItem(tree.type);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitIdent(JCIdent tree) {
aoqi@0:         Symbol sym = tree.sym;
aoqi@0:         if (tree.name == names._this || tree.name == names._super) {
aoqi@0:             Item res = tree.name == names._this
aoqi@0:                 ? items.makeThisItem()
aoqi@0:                 : items.makeSuperItem();
aoqi@0:             if (sym.kind == MTH) {
aoqi@0:                 // Generate code to address the constructor.
aoqi@0:                 res.load();
aoqi@0:                 res = items.makeMemberItem(sym, true);
aoqi@0:             }
aoqi@0:             result = res;
aoqi@0:         } else if (sym.kind == VAR && sym.owner.kind == MTH) {
aoqi@0:             result = items.makeLocalItem((VarSymbol)sym);
aoqi@0:         } else if (isInvokeDynamic(sym)) {
aoqi@0:             result = items.makeDynamicItem(sym);
aoqi@0:         } else if ((sym.flags() & STATIC) != 0) {
aoqi@0:             if (!isAccessSuper(env.enclMethod))
aoqi@0:                 sym = binaryQualifier(sym, env.enclClass.type);
aoqi@0:             result = items.makeStaticItem(sym);
aoqi@0:         } else {
aoqi@0:             items.makeThisItem().load();
aoqi@0:             sym = binaryQualifier(sym, env.enclClass.type);
aoqi@0:             result = items.makeMemberItem(sym, (sym.flags() & PRIVATE) != 0);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitSelect(JCFieldAccess tree) {
aoqi@0:         Symbol sym = tree.sym;
aoqi@0: 
aoqi@0:         if (tree.name == names._class) {
aoqi@0:             Assert.check(target.hasClassLiterals());
aoqi@0:             code.emitLdc(makeRef(tree.pos(), tree.selected.type));
aoqi@0:             result = items.makeStackItem(pt);
aoqi@0:             return;
aoqi@0:        }
aoqi@0: 
aoqi@0:         Symbol ssym = TreeInfo.symbol(tree.selected);
aoqi@0: 
aoqi@0:         // Are we selecting via super?
aoqi@0:         boolean selectSuper =
aoqi@0:             ssym != null && (ssym.kind == TYP || ssym.name == names._super);
aoqi@0: 
aoqi@0:         // Are we accessing a member of the superclass in an access method
aoqi@0:         // resulting from a qualified super?
aoqi@0:         boolean accessSuper = isAccessSuper(env.enclMethod);
aoqi@0: 
aoqi@0:         Item base = (selectSuper)
aoqi@0:             ? items.makeSuperItem()
aoqi@0:             : genExpr(tree.selected, tree.selected.type);
aoqi@0: 
aoqi@0:         if (sym.kind == VAR && ((VarSymbol) sym).getConstValue() != null) {
aoqi@0:             // We are seeing a variable that is constant but its selecting
aoqi@0:             // expression is not.
aoqi@0:             if ((sym.flags() & STATIC) != 0) {
aoqi@0:                 if (!selectSuper && (ssym == null || ssym.kind != TYP))
aoqi@0:                     base = base.load();
aoqi@0:                 base.drop();
aoqi@0:             } else {
aoqi@0:                 base.load();
aoqi@0:                 genNullCheck(tree.selected.pos());
aoqi@0:             }
aoqi@0:             result = items.
aoqi@0:                 makeImmediateItem(sym.type, ((VarSymbol) sym).getConstValue());
aoqi@0:         } else {
aoqi@0:             if (isInvokeDynamic(sym)) {
aoqi@0:                 result = items.makeDynamicItem(sym);
aoqi@0:                 return;
aoqi@0:             } else {
aoqi@0:                 sym = binaryQualifier(sym, tree.selected.type);
aoqi@0:             }
aoqi@0:             if ((sym.flags() & STATIC) != 0) {
aoqi@0:                 if (!selectSuper && (ssym == null || ssym.kind != TYP))
aoqi@0:                     base = base.load();
aoqi@0:                 base.drop();
aoqi@0:                 result = items.makeStaticItem(sym);
aoqi@0:             } else {
aoqi@0:                 base.load();
aoqi@0:                 if (sym == syms.lengthVar) {
aoqi@0:                     code.emitop0(arraylength);
aoqi@0:                     result = items.makeStackItem(syms.intType);
aoqi@0:                 } else {
aoqi@0:                     result = items.
aoqi@0:                         makeMemberItem(sym,
aoqi@0:                                        (sym.flags() & PRIVATE) != 0 ||
aoqi@0:                                        selectSuper || accessSuper);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isInvokeDynamic(Symbol sym) {
aoqi@0:         return sym.kind == MTH && ((MethodSymbol)sym).isDynamic();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitLiteral(JCLiteral tree) {
aoqi@0:         if (tree.type.hasTag(BOT)) {
aoqi@0:             code.emitop0(aconst_null);
aoqi@0:             if (types.dimensions(pt) > 1) {
aoqi@0:                 code.emitop2(checkcast, makeRef(tree.pos(), pt));
aoqi@0:                 result = items.makeStackItem(pt);
aoqi@0:             } else {
aoqi@0:                 result = items.makeStackItem(tree.type);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         else
aoqi@0:             result = items.makeImmediateItem(tree.type, tree.value);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void visitLetExpr(LetExpr tree) {
aoqi@0:         int limit = code.nextreg;
aoqi@0:         genStats(tree.defs, env);
aoqi@0:         result = genExpr(tree.expr, tree.expr.type).load();
aoqi@0:         code.endScopes(limit);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private void generateReferencesToPrunedTree(ClassSymbol classSymbol, Pool pool) {
aoqi@0:         List<JCTree> prunedInfo = lower.prunedTree.get(classSymbol);
aoqi@0:         if (prunedInfo != null) {
aoqi@0:             for (JCTree prunedTree: prunedInfo) {
aoqi@0:                 prunedTree.accept(classReferenceVisitor);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * main method
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** Generate code for a class definition.
aoqi@0:      *  @param env   The attribution environment that belongs to the
aoqi@0:      *               outermost class containing this class definition.
aoqi@0:      *               We need this for resolving some additional symbols.
aoqi@0:      *  @param cdef  The tree representing the class definition.
aoqi@0:      *  @return      True if code is generated with no errors.
aoqi@0:      */
aoqi@0:     public boolean genClass(Env<AttrContext> env, JCClassDecl cdef) {
aoqi@0:         try {
aoqi@0:             attrEnv = env;
aoqi@0:             ClassSymbol c = cdef.sym;
aoqi@0:             this.toplevel = env.toplevel;
aoqi@0:             this.endPosTable = toplevel.endPositions;
aoqi@0:             // If this is a class definition requiring Miranda methods,
aoqi@0:             // add them.
aoqi@0:             if (generateIproxies &&
aoqi@0:                 (c.flags() & (INTERFACE|ABSTRACT)) == ABSTRACT
aoqi@0:                 && !allowGenerics // no Miranda methods available with generics
aoqi@0:                 )
aoqi@0:                 implementInterfaceMethods(c);
aoqi@0:             c.pool = pool;
aoqi@0:             pool.reset();
vromero@2810:             /* method normalizeDefs() can add references to external classes into the constant pool
vromero@2810:              * so it should be called after pool.reset()
vromero@2810:              */
vromero@2810:             cdef.defs = normalizeDefs(cdef.defs, c);
aoqi@0:             generateReferencesToPrunedTree(c, pool);
aoqi@0:             Env<GenContext> localEnv =
aoqi@0:                 new Env<GenContext>(cdef, new GenContext());
aoqi@0:             localEnv.toplevel = env.toplevel;
aoqi@0:             localEnv.enclClass = cdef;
aoqi@0: 
aoqi@0:             for (List<JCTree> l = cdef.defs; l.nonEmpty(); l = l.tail) {
aoqi@0:                 genDef(l.head, localEnv);
aoqi@0:             }
aoqi@0:             if (pool.numEntries() > Pool.MAX_ENTRIES) {
aoqi@0:                 log.error(cdef.pos(), "limit.pool");
aoqi@0:                 nerrs++;
aoqi@0:             }
aoqi@0:             if (nerrs != 0) {
aoqi@0:                 // if errors, discard code
aoqi@0:                 for (List<JCTree> l = cdef.defs; l.nonEmpty(); l = l.tail) {
aoqi@0:                     if (l.head.hasTag(METHODDEF))
aoqi@0:                         ((JCMethodDecl) l.head).sym.code = null;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             cdef.defs = List.nil(); // discard trees
aoqi@0:             return nerrs == 0;
aoqi@0:         } finally {
aoqi@0:             // note: this method does NOT support recursion.
aoqi@0:             attrEnv = null;
aoqi@0:             this.env = null;
aoqi@0:             toplevel = null;
aoqi@0:             endPosTable = null;
aoqi@0:             nerrs = 0;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Auxiliary classes
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** An abstract class for finalizer generation.
aoqi@0:      */
aoqi@0:     abstract class GenFinalizer {
aoqi@0:         /** Generate code to clean up when unwinding. */
aoqi@0:         abstract void gen();
aoqi@0: 
aoqi@0:         /** Generate code to clean up at last. */
aoqi@0:         abstract void genLast();
aoqi@0: 
aoqi@0:         /** Does this finalizer have some nontrivial cleanup to perform? */
aoqi@0:         boolean hasFinalizer() { return true; }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** code generation contexts,
aoqi@0:      *  to be used as type parameter for environments.
aoqi@0:      */
aoqi@0:     static class GenContext {
aoqi@0: 
aoqi@0:         /** A chain for all unresolved jumps that exit the current environment.
aoqi@0:          */
aoqi@0:         Chain exit = null;
aoqi@0: 
aoqi@0:         /** A chain for all unresolved jumps that continue in the
aoqi@0:          *  current environment.
aoqi@0:          */
aoqi@0:         Chain cont = null;
aoqi@0: 
aoqi@0:         /** A closure that generates the finalizer of the current environment.
aoqi@0:          *  Only set for Synchronized and Try contexts.
aoqi@0:          */
aoqi@0:         GenFinalizer finalize = null;
aoqi@0: 
aoqi@0:         /** Is this a switch statement?  If so, allocate registers
aoqi@0:          * even when the variable declaration is unreachable.
aoqi@0:          */
aoqi@0:         boolean isSwitch = false;
aoqi@0: 
aoqi@0:         /** A list buffer containing all gaps in the finalizer range,
aoqi@0:          *  where a catch all exception should not apply.
aoqi@0:          */
aoqi@0:         ListBuffer<Integer> gaps = null;
aoqi@0: 
aoqi@0:         /** Add given chain to exit chain.
aoqi@0:          */
aoqi@0:         void addExit(Chain c)  {
aoqi@0:             exit = Code.mergeChains(c, exit);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Add given chain to cont chain.
aoqi@0:          */
aoqi@0:         void addCont(Chain c) {
aoqi@0:             cont = Code.mergeChains(c, cont);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: }