aoqi@0: /*
aoqi@0:  * Copyright (c) 1999, 2014, 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 com.sun.tools.javac.code.*;
aoqi@0: import com.sun.tools.javac.code.Symbol.*;
aoqi@0: import com.sun.tools.javac.code.Types.UniqueType;
aoqi@0: import com.sun.tools.javac.tree.JCTree;
aoqi@0: import com.sun.tools.javac.util.*;
aoqi@0: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
aoqi@0: 
aoqi@0: import static com.sun.tools.javac.code.TypeTag.BOT;
aoqi@0: import static com.sun.tools.javac.code.TypeTag.INT;
aoqi@0: import static com.sun.tools.javac.jvm.ByteCodes.*;
aoqi@0: import static com.sun.tools.javac.jvm.UninitializedType.*;
aoqi@0: import static com.sun.tools.javac.jvm.ClassWriter.StackMapTableFrame;
aoqi@0: 
aoqi@0: /** An internal structure that corresponds to the code attribute of
aoqi@0:  *  methods in a classfile. The class also provides some utility operations to
aoqi@0:  *  generate bytecode instructions.
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 Code {
aoqi@0: 
aoqi@0:     public final boolean debugCode;
aoqi@0:     public final boolean needStackMap;
aoqi@0: 
aoqi@0:     public enum StackMapFormat {
aoqi@0:         NONE,
aoqi@0:         CLDC {
aoqi@0:             Name getAttributeName(Names names) {
aoqi@0:                 return names.StackMap;
aoqi@0:             }
aoqi@0:         },
aoqi@0:         JSR202 {
aoqi@0:             Name getAttributeName(Names names) {
aoqi@0:                 return names.StackMapTable;
aoqi@0:             }
aoqi@0:         };
aoqi@0:         Name getAttributeName(Names names) {
aoqi@0:             return names.empty;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     final Types types;
aoqi@0:     final Symtab syms;
aoqi@0: 
aoqi@0: /*---------- classfile fields: --------------- */
aoqi@0: 
aoqi@0:     /** The maximum stack size.
aoqi@0:      */
aoqi@0:     public int max_stack = 0;
aoqi@0: 
aoqi@0:     /** The maximum number of local variable slots.
aoqi@0:      */
aoqi@0:     public int max_locals = 0;
aoqi@0: 
aoqi@0:     /** The code buffer.
aoqi@0:      */
aoqi@0:     public byte[] code = new byte[64];
aoqi@0: 
aoqi@0:     /** the current code pointer.
aoqi@0:      */
aoqi@0:     public int cp = 0;
aoqi@0: 
aoqi@0:     /** Check the code against VM spec limits; if
aoqi@0:      *  problems report them and return true.
aoqi@0:      */
aoqi@0:     public boolean checkLimits(DiagnosticPosition pos, Log log) {
aoqi@0:         if (cp > ClassFile.MAX_CODE) {
aoqi@0:             log.error(pos, "limit.code");
aoqi@0:             return true;
aoqi@0:         }
aoqi@0:         if (max_locals > ClassFile.MAX_LOCALS) {
aoqi@0:             log.error(pos, "limit.locals");
aoqi@0:             return true;
aoqi@0:         }
aoqi@0:         if (max_stack > ClassFile.MAX_STACK) {
aoqi@0:             log.error(pos, "limit.stack");
aoqi@0:             return true;
aoqi@0:         }
aoqi@0:         return false;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** A buffer for expression catch data. Each enter is a vector
aoqi@0:      *  of four unsigned shorts.
aoqi@0:      */
aoqi@0:     ListBuffer<char[]> catchInfo = new ListBuffer<char[]>();
aoqi@0: 
aoqi@0:     /** A buffer for line number information. Each entry is a vector
aoqi@0:      *  of two unsigned shorts.
aoqi@0:      */
aoqi@0:     List<char[]> lineInfo = List.nil(); // handled in stack fashion
aoqi@0: 
aoqi@0:     /** The CharacterRangeTable
aoqi@0:      */
aoqi@0:     public CRTable crt;
aoqi@0: 
aoqi@0: /*---------- internal fields: --------------- */
aoqi@0: 
aoqi@0:     /** Are we generating code with jumps &ge; 32K?
aoqi@0:      */
aoqi@0:     public boolean fatcode;
aoqi@0: 
aoqi@0:     /** Code generation enabled?
aoqi@0:      */
aoqi@0:     private boolean alive = true;
aoqi@0: 
aoqi@0:     /** The current machine state (registers and stack).
aoqi@0:      */
aoqi@0:     State state;
aoqi@0: 
aoqi@0:     /** Is it forbidden to compactify code, because something is
aoqi@0:      *  pointing to current location?
aoqi@0:      */
aoqi@0:     private boolean fixedPc = false;
aoqi@0: 
aoqi@0:     /** The next available register.
aoqi@0:      */
aoqi@0:     public int nextreg = 0;
aoqi@0: 
aoqi@0:     /** A chain for jumps to be resolved before the next opcode is emitted.
aoqi@0:      *  We do this lazily to avoid jumps to jumps.
aoqi@0:      */
aoqi@0:     Chain pendingJumps = null;
aoqi@0: 
aoqi@0:     /** The position of the currently statement, if we are at the
aoqi@0:      *  start of this statement, NOPOS otherwise.
aoqi@0:      *  We need this to emit line numbers lazily, which we need to do
aoqi@0:      *  because of jump-to-jump optimization.
aoqi@0:      */
aoqi@0:     int pendingStatPos = Position.NOPOS;
aoqi@0: 
aoqi@0:     /** Set true when a stackMap is needed at the current PC. */
aoqi@0:     boolean pendingStackMap = false;
aoqi@0: 
aoqi@0:     /** The stack map format to be generated. */
aoqi@0:     StackMapFormat stackMap;
aoqi@0: 
aoqi@0:     /** Switch: emit variable debug info.
aoqi@0:      */
aoqi@0:     boolean varDebugInfo;
aoqi@0: 
aoqi@0:     /** Switch: emit line number info.
aoqi@0:      */
aoqi@0:     boolean lineDebugInfo;
aoqi@0: 
aoqi@0:     /** Emit line number info if map supplied
aoqi@0:      */
aoqi@0:     Position.LineMap lineMap;
aoqi@0: 
aoqi@0:     /** The constant pool of the current class.
aoqi@0:      */
aoqi@0:     final Pool pool;
aoqi@0: 
aoqi@0:     final MethodSymbol meth;
aoqi@0: 
aoqi@0:     final LVTRanges lvtRanges;
aoqi@0: 
aoqi@0:     /** Construct a code object, given the settings of the fatcode,
aoqi@0:      *  debugging info switches and the CharacterRangeTable.
aoqi@0:      */
aoqi@0:     public Code(MethodSymbol meth,
aoqi@0:                 boolean fatcode,
aoqi@0:                 Position.LineMap lineMap,
aoqi@0:                 boolean varDebugInfo,
aoqi@0:                 StackMapFormat stackMap,
aoqi@0:                 boolean debugCode,
aoqi@0:                 CRTable crt,
aoqi@0:                 Symtab syms,
aoqi@0:                 Types types,
aoqi@0:                 Pool pool,
aoqi@0:                 LVTRanges lvtRanges) {
aoqi@0:         this.meth = meth;
aoqi@0:         this.fatcode = fatcode;
aoqi@0:         this.lineMap = lineMap;
aoqi@0:         this.lineDebugInfo = lineMap != null;
aoqi@0:         this.varDebugInfo = varDebugInfo;
aoqi@0:         this.crt = crt;
aoqi@0:         this.syms = syms;
aoqi@0:         this.types = types;
aoqi@0:         this.debugCode = debugCode;
aoqi@0:         this.stackMap = stackMap;
aoqi@0:         switch (stackMap) {
aoqi@0:         case CLDC:
aoqi@0:         case JSR202:
aoqi@0:             this.needStackMap = true;
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             this.needStackMap = false;
aoqi@0:         }
aoqi@0:         state = new State();
aoqi@0:         lvar = new LocalVar[20];
aoqi@0:         this.pool = pool;
aoqi@0:         this.lvtRanges = lvtRanges;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /* **************************************************************************
aoqi@0:  * Typecodes & related stuff
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** Given a type, return its type code (used implicitly in the
aoqi@0:      *  JVM architecture).
aoqi@0:      */
aoqi@0:     public static int typecode(Type type) {
aoqi@0:         switch (type.getTag()) {
aoqi@0:         case BYTE: return BYTEcode;
aoqi@0:         case SHORT: return SHORTcode;
aoqi@0:         case CHAR: return CHARcode;
aoqi@0:         case INT: return INTcode;
aoqi@0:         case LONG: return LONGcode;
aoqi@0:         case FLOAT: return FLOATcode;
aoqi@0:         case DOUBLE: return DOUBLEcode;
aoqi@0:         case BOOLEAN: return BYTEcode;
aoqi@0:         case VOID: return VOIDcode;
aoqi@0:         case CLASS:
aoqi@0:         case ARRAY:
aoqi@0:         case METHOD:
aoqi@0:         case BOT:
aoqi@0:         case TYPEVAR:
aoqi@0:         case UNINITIALIZED_THIS:
aoqi@0:         case UNINITIALIZED_OBJECT:
aoqi@0:             return OBJECTcode;
aoqi@0:         default: throw new AssertionError("typecode " + type.getTag());
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Collapse type code for subtypes of int to INTcode.
aoqi@0:      */
aoqi@0:     public static int truncate(int tc) {
aoqi@0:         switch (tc) {
aoqi@0:         case BYTEcode: case SHORTcode: case CHARcode: return INTcode;
aoqi@0:         default: return tc;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** The width in bytes of objects of the type.
aoqi@0:      */
aoqi@0:     public static int width(int typecode) {
aoqi@0:         switch (typecode) {
aoqi@0:         case LONGcode: case DOUBLEcode: return 2;
aoqi@0:         case VOIDcode: return 0;
aoqi@0:         default: return 1;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static int width(Type type) {
aoqi@0:         return type == null ? 1 : width(typecode(type));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** The total width taken up by a vector of objects.
aoqi@0:      */
aoqi@0:     public static int width(List<Type> types) {
aoqi@0:         int w = 0;
aoqi@0:         for (List<Type> l = types; l.nonEmpty(); l = l.tail)
aoqi@0:             w = w + width(l.head);
aoqi@0:         return w;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Given a type, return its code for allocating arrays of that type.
aoqi@0:      */
aoqi@0:     public static int arraycode(Type type) {
aoqi@0:         switch (type.getTag()) {
aoqi@0:         case BYTE: return 8;
aoqi@0:         case BOOLEAN: return 4;
aoqi@0:         case SHORT: return 9;
aoqi@0:         case CHAR: return 5;
aoqi@0:         case INT: return 10;
aoqi@0:         case LONG: return 11;
aoqi@0:         case FLOAT: return 6;
aoqi@0:         case DOUBLE: return 7;
aoqi@0:         case CLASS: return 0;
aoqi@0:         case ARRAY: return 1;
aoqi@0:         default: throw new AssertionError("arraycode " + type);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /* **************************************************************************
aoqi@0:  * Emit code
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** The current output code pointer.
aoqi@0:      */
aoqi@0:     public int curCP() {
aoqi@0:         /*
aoqi@0:          * This method has side-effects because calling it can indirectly provoke
aoqi@0:          *  extra code generation, like goto instructions, depending on the context
aoqi@0:          *  where it's called.
aoqi@0:          *  Use with care or even better avoid using it.
aoqi@0:          */
aoqi@0:         if (pendingJumps != null) {
aoqi@0:             resolvePending();
aoqi@0:         }
aoqi@0:         if (pendingStatPos != Position.NOPOS) {
aoqi@0:             markStatBegin();
aoqi@0:         }
aoqi@0:         fixedPc = true;
aoqi@0:         return cp;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit a byte of code.
aoqi@0:      */
aoqi@0:     private  void emit1(int od) {
aoqi@0:         if (!alive) return;
aoqi@0:         code = ArrayUtils.ensureCapacity(code, cp);
aoqi@0:         code[cp++] = (byte)od;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit two bytes of code.
aoqi@0:      */
aoqi@0:     private void emit2(int od) {
aoqi@0:         if (!alive) return;
aoqi@0:         if (cp + 2 > code.length) {
aoqi@0:             emit1(od >> 8);
aoqi@0:             emit1(od);
aoqi@0:         } else {
aoqi@0:             code[cp++] = (byte)(od >> 8);
aoqi@0:             code[cp++] = (byte)od;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit four bytes of code.
aoqi@0:      */
aoqi@0:     public void emit4(int od) {
aoqi@0:         if (!alive) return;
aoqi@0:         if (cp + 4 > code.length) {
aoqi@0:             emit1(od >> 24);
aoqi@0:             emit1(od >> 16);
aoqi@0:             emit1(od >> 8);
aoqi@0:             emit1(od);
aoqi@0:         } else {
aoqi@0:             code[cp++] = (byte)(od >> 24);
aoqi@0:             code[cp++] = (byte)(od >> 16);
aoqi@0:             code[cp++] = (byte)(od >> 8);
aoqi@0:             code[cp++] = (byte)od;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode.
aoqi@0:      */
aoqi@0:     private void emitop(int op) {
aoqi@0:         if (pendingJumps != null) resolvePending();
aoqi@0:         if (alive) {
aoqi@0:             if (pendingStatPos != Position.NOPOS)
aoqi@0:                 markStatBegin();
aoqi@0:             if (pendingStackMap) {
aoqi@0:                 pendingStackMap = false;
aoqi@0:                 emitStackMap();
aoqi@0:             }
aoqi@0:             if (debugCode)
aoqi@0:                 System.err.println("emit@" + cp + " stack=" +
aoqi@0:                                    state.stacksize + ": " +
aoqi@0:                                    mnem(op));
aoqi@0:             emit1(op);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     void postop() {
aoqi@0:         Assert.check(alive || state.stacksize == 0);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit a ldc (or ldc_w) instruction, taking into account operand size
aoqi@0:     */
aoqi@0:     public void emitLdc(int od) {
aoqi@0:         if (od <= 255) {
aoqi@0:             emitop1(ldc1, od);
aoqi@0:         }
aoqi@0:         else {
aoqi@0:             emitop2(ldc2, od);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit a multinewarray instruction.
aoqi@0:      */
aoqi@0:     public void emitMultianewarray(int ndims, int type, Type arrayType) {
aoqi@0:         emitop(multianewarray);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(type);
aoqi@0:         emit1(ndims);
aoqi@0:         state.pop(ndims);
aoqi@0:         state.push(arrayType);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit newarray.
aoqi@0:      */
aoqi@0:     public void emitNewarray(int elemcode, Type arrayType) {
aoqi@0:         emitop(newarray);
aoqi@0:         if (!alive) return;
aoqi@0:         emit1(elemcode);
aoqi@0:         state.pop(1); // count
aoqi@0:         state.push(arrayType);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit anewarray.
aoqi@0:      */
aoqi@0:     public void emitAnewarray(int od, Type arrayType) {
aoqi@0:         emitop(anewarray);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(od);
aoqi@0:         state.pop(1);
aoqi@0:         state.push(arrayType);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an invokeinterface instruction.
aoqi@0:      */
aoqi@0:     public void emitInvokeinterface(int meth, Type mtype) {
aoqi@0:         int argsize = width(mtype.getParameterTypes());
aoqi@0:         emitop(invokeinterface);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(meth);
aoqi@0:         emit1(argsize + 1);
aoqi@0:         emit1(0);
aoqi@0:         state.pop(argsize + 1);
aoqi@0:         state.push(mtype.getReturnType());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an invokespecial instruction.
aoqi@0:      */
aoqi@0:     public void emitInvokespecial(int meth, Type mtype) {
aoqi@0:         int argsize = width(mtype.getParameterTypes());
aoqi@0:         emitop(invokespecial);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(meth);
aoqi@0:         Symbol sym = (Symbol)pool.pool[meth];
aoqi@0:         state.pop(argsize);
aoqi@0:         if (sym.isConstructor())
aoqi@0:             state.markInitialized((UninitializedType)state.peek());
aoqi@0:         state.pop(1);
aoqi@0:         state.push(mtype.getReturnType());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an invokestatic instruction.
aoqi@0:      */
aoqi@0:     public void emitInvokestatic(int meth, Type mtype) {
aoqi@0:         int argsize = width(mtype.getParameterTypes());
aoqi@0:         emitop(invokestatic);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(meth);
aoqi@0:         state.pop(argsize);
aoqi@0:         state.push(mtype.getReturnType());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an invokevirtual instruction.
aoqi@0:      */
aoqi@0:     public void emitInvokevirtual(int meth, Type mtype) {
aoqi@0:         int argsize = width(mtype.getParameterTypes());
aoqi@0:         emitop(invokevirtual);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(meth);
aoqi@0:         state.pop(argsize + 1);
aoqi@0:         state.push(mtype.getReturnType());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an invokedynamic instruction.
aoqi@0:      */
aoqi@0:     public void emitInvokedynamic(int desc, Type mtype) {
aoqi@0:         int argsize = width(mtype.getParameterTypes());
aoqi@0:         emitop(invokedynamic);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(desc);
aoqi@0:         emit2(0);
aoqi@0:         state.pop(argsize);
aoqi@0:         state.push(mtype.getReturnType());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode with no operand field.
aoqi@0:      */
aoqi@0:     public void emitop0(int op) {
aoqi@0:         emitop(op);
aoqi@0:         if (!alive) return;
aoqi@0:         switch (op) {
aoqi@0:         case aaload: {
aoqi@0:             state.pop(1);// index
aoqi@0:             Type a = state.stack[state.stacksize-1];
aoqi@0:             state.pop(1);
aoqi@0:             //sometimes 'null type' is treated as a one-dimensional array type
aoqi@0:             //see Gen.visitLiteral - we should handle this case accordingly
aoqi@0:             Type stackType = a.hasTag(BOT) ?
aoqi@0:                 syms.objectType :
aoqi@0:                 types.erasure(types.elemtype(a));
aoqi@0:             state.push(stackType); }
aoqi@0:             break;
aoqi@0:         case goto_:
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case nop:
aoqi@0:         case ineg:
aoqi@0:         case lneg:
aoqi@0:         case fneg:
aoqi@0:         case dneg:
aoqi@0:             break;
aoqi@0:         case aconst_null:
aoqi@0:             state.push(syms.botType);
aoqi@0:             break;
aoqi@0:         case iconst_m1:
aoqi@0:         case iconst_0:
aoqi@0:         case iconst_1:
aoqi@0:         case iconst_2:
aoqi@0:         case iconst_3:
aoqi@0:         case iconst_4:
aoqi@0:         case iconst_5:
aoqi@0:         case iload_0:
aoqi@0:         case iload_1:
aoqi@0:         case iload_2:
aoqi@0:         case iload_3:
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case lconst_0:
aoqi@0:         case lconst_1:
aoqi@0:         case lload_0:
aoqi@0:         case lload_1:
aoqi@0:         case lload_2:
aoqi@0:         case lload_3:
aoqi@0:             state.push(syms.longType);
aoqi@0:             break;
aoqi@0:         case fconst_0:
aoqi@0:         case fconst_1:
aoqi@0:         case fconst_2:
aoqi@0:         case fload_0:
aoqi@0:         case fload_1:
aoqi@0:         case fload_2:
aoqi@0:         case fload_3:
aoqi@0:             state.push(syms.floatType);
aoqi@0:             break;
aoqi@0:         case dconst_0:
aoqi@0:         case dconst_1:
aoqi@0:         case dload_0:
aoqi@0:         case dload_1:
aoqi@0:         case dload_2:
aoqi@0:         case dload_3:
aoqi@0:             state.push(syms.doubleType);
aoqi@0:             break;
aoqi@0:         case aload_0:
aoqi@0:             state.push(lvar[0].sym.type);
aoqi@0:             break;
aoqi@0:         case aload_1:
aoqi@0:             state.push(lvar[1].sym.type);
aoqi@0:             break;
aoqi@0:         case aload_2:
aoqi@0:             state.push(lvar[2].sym.type);
aoqi@0:             break;
aoqi@0:         case aload_3:
aoqi@0:             state.push(lvar[3].sym.type);
aoqi@0:             break;
aoqi@0:         case iaload:
aoqi@0:         case baload:
aoqi@0:         case caload:
aoqi@0:         case saload:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case laload:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.longType);
aoqi@0:             break;
aoqi@0:         case faload:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.floatType);
aoqi@0:             break;
aoqi@0:         case daload:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.doubleType);
aoqi@0:             break;
aoqi@0:         case istore_0:
aoqi@0:         case istore_1:
aoqi@0:         case istore_2:
aoqi@0:         case istore_3:
aoqi@0:         case fstore_0:
aoqi@0:         case fstore_1:
aoqi@0:         case fstore_2:
aoqi@0:         case fstore_3:
aoqi@0:         case astore_0:
aoqi@0:         case astore_1:
aoqi@0:         case astore_2:
aoqi@0:         case astore_3:
aoqi@0:         case pop:
aoqi@0:         case lshr:
aoqi@0:         case lshl:
aoqi@0:         case lushr:
aoqi@0:             state.pop(1);
aoqi@0:             break;
aoqi@0:         case areturn:
aoqi@0:         case ireturn:
aoqi@0:         case freturn:
aoqi@0:             Assert.check(state.nlocks == 0);
aoqi@0:             state.pop(1);
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case athrow:
aoqi@0:             state.pop(1);
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case lstore_0:
aoqi@0:         case lstore_1:
aoqi@0:         case lstore_2:
aoqi@0:         case lstore_3:
aoqi@0:         case dstore_0:
aoqi@0:         case dstore_1:
aoqi@0:         case dstore_2:
aoqi@0:         case dstore_3:
aoqi@0:         case pop2:
aoqi@0:             state.pop(2);
aoqi@0:             break;
aoqi@0:         case lreturn:
aoqi@0:         case dreturn:
aoqi@0:             Assert.check(state.nlocks == 0);
aoqi@0:             state.pop(2);
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case dup:
aoqi@0:             state.push(state.stack[state.stacksize-1]);
aoqi@0:             break;
aoqi@0:         case return_:
aoqi@0:             Assert.check(state.nlocks == 0);
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case arraylength:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case isub:
aoqi@0:         case iadd:
aoqi@0:         case imul:
aoqi@0:         case idiv:
aoqi@0:         case imod:
aoqi@0:         case ishl:
aoqi@0:         case ishr:
aoqi@0:         case iushr:
aoqi@0:         case iand:
aoqi@0:         case ior:
aoqi@0:         case ixor:
aoqi@0:             state.pop(1);
aoqi@0:             // state.pop(1);
aoqi@0:             // state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case aastore:
aoqi@0:             state.pop(3);
aoqi@0:             break;
aoqi@0:         case land:
aoqi@0:         case lor:
aoqi@0:         case lxor:
aoqi@0:         case lmod:
aoqi@0:         case ldiv:
aoqi@0:         case lmul:
aoqi@0:         case lsub:
aoqi@0:         case ladd:
aoqi@0:             state.pop(2);
aoqi@0:             break;
aoqi@0:         case lcmp:
aoqi@0:             state.pop(4);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case l2i:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case i2l:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.longType);
aoqi@0:             break;
aoqi@0:         case i2f:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.floatType);
aoqi@0:             break;
aoqi@0:         case i2d:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.doubleType);
aoqi@0:             break;
aoqi@0:         case l2f:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.floatType);
aoqi@0:             break;
aoqi@0:         case l2d:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.doubleType);
aoqi@0:             break;
aoqi@0:         case f2i:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case f2l:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.longType);
aoqi@0:             break;
aoqi@0:         case f2d:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.doubleType);
aoqi@0:             break;
aoqi@0:         case d2i:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case d2l:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.longType);
aoqi@0:             break;
aoqi@0:         case d2f:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.floatType);
aoqi@0:             break;
aoqi@0:         case tableswitch:
aoqi@0:         case lookupswitch:
aoqi@0:             state.pop(1);
aoqi@0:             // the caller is responsible for patching up the state
aoqi@0:             break;
aoqi@0:         case dup_x1: {
aoqi@0:             Type val1 = state.pop1();
aoqi@0:             Type val2 = state.pop1();
aoqi@0:             state.push(val1);
aoqi@0:             state.push(val2);
aoqi@0:             state.push(val1);
aoqi@0:             break;
aoqi@0:         }
aoqi@0:         case bastore:
aoqi@0:             state.pop(3);
aoqi@0:             break;
aoqi@0:         case int2byte:
aoqi@0:         case int2char:
aoqi@0:         case int2short:
aoqi@0:             break;
aoqi@0:         case fmul:
aoqi@0:         case fadd:
aoqi@0:         case fsub:
aoqi@0:         case fdiv:
aoqi@0:         case fmod:
aoqi@0:             state.pop(1);
aoqi@0:             break;
aoqi@0:         case castore:
aoqi@0:         case iastore:
aoqi@0:         case fastore:
aoqi@0:         case sastore:
aoqi@0:             state.pop(3);
aoqi@0:             break;
aoqi@0:         case lastore:
aoqi@0:         case dastore:
aoqi@0:             state.pop(4);
aoqi@0:             break;
aoqi@0:         case dup2:
aoqi@0:             if (state.stack[state.stacksize-1] != null) {
aoqi@0:                 Type value1 = state.pop1();
aoqi@0:                 Type value2 = state.pop1();
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:             } else {
aoqi@0:                 Type value = state.pop2();
aoqi@0:                 state.push(value);
aoqi@0:                 state.push(value);
aoqi@0:             }
aoqi@0:             break;
aoqi@0:         case dup2_x1:
aoqi@0:             if (state.stack[state.stacksize-1] != null) {
aoqi@0:                 Type value1 = state.pop1();
aoqi@0:                 Type value2 = state.pop1();
aoqi@0:                 Type value3 = state.pop1();
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:                 state.push(value3);
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:             } else {
aoqi@0:                 Type value1 = state.pop2();
aoqi@0:                 Type value2 = state.pop1();
aoqi@0:                 state.push(value1);
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:             }
aoqi@0:             break;
aoqi@0:         case dup2_x2:
aoqi@0:             if (state.stack[state.stacksize-1] != null) {
aoqi@0:                 Type value1 = state.pop1();
aoqi@0:                 Type value2 = state.pop1();
aoqi@0:                 if (state.stack[state.stacksize-1] != null) {
aoqi@0:                     // form 1
aoqi@0:                     Type value3 = state.pop1();
aoqi@0:                     Type value4 = state.pop1();
aoqi@0:                     state.push(value2);
aoqi@0:                     state.push(value1);
aoqi@0:                     state.push(value4);
aoqi@0:                     state.push(value3);
aoqi@0:                     state.push(value2);
aoqi@0:                     state.push(value1);
aoqi@0:                 } else {
aoqi@0:                     // form 3
aoqi@0:                     Type value3 = state.pop2();
aoqi@0:                     state.push(value2);
aoqi@0:                     state.push(value1);
aoqi@0:                     state.push(value3);
aoqi@0:                     state.push(value2);
aoqi@0:                     state.push(value1);
aoqi@0:                 }
aoqi@0:             } else {
aoqi@0:                 Type value1 = state.pop2();
aoqi@0:                 if (state.stack[state.stacksize-1] != null) {
aoqi@0:                     // form 2
aoqi@0:                     Type value2 = state.pop1();
aoqi@0:                     Type value3 = state.pop1();
aoqi@0:                     state.push(value1);
aoqi@0:                     state.push(value3);
aoqi@0:                     state.push(value2);
aoqi@0:                     state.push(value1);
aoqi@0:                 } else {
aoqi@0:                     // form 4
aoqi@0:                     Type value2 = state.pop2();
aoqi@0:                     state.push(value1);
aoqi@0:                     state.push(value2);
aoqi@0:                     state.push(value1);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             break;
aoqi@0:         case dup_x2: {
aoqi@0:             Type value1 = state.pop1();
aoqi@0:             if (state.stack[state.stacksize-1] != null) {
aoqi@0:                 // form 1
aoqi@0:                 Type value2 = state.pop1();
aoqi@0:                 Type value3 = state.pop1();
aoqi@0:                 state.push(value1);
aoqi@0:                 state.push(value3);
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:             } else {
aoqi@0:                 // form 2
aoqi@0:                 Type value2 = state.pop2();
aoqi@0:                 state.push(value1);
aoqi@0:                 state.push(value2);
aoqi@0:                 state.push(value1);
aoqi@0:             }
aoqi@0:         }
aoqi@0:             break;
aoqi@0:         case fcmpl:
aoqi@0:         case fcmpg:
aoqi@0:             state.pop(2);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case dcmpl:
aoqi@0:         case dcmpg:
aoqi@0:             state.pop(4);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case swap: {
aoqi@0:             Type value1 = state.pop1();
aoqi@0:             Type value2 = state.pop1();
aoqi@0:             state.push(value1);
aoqi@0:             state.push(value2);
aoqi@0:             break;
aoqi@0:         }
aoqi@0:         case dadd:
aoqi@0:         case dsub:
aoqi@0:         case dmul:
aoqi@0:         case ddiv:
aoqi@0:         case dmod:
aoqi@0:             state.pop(2);
aoqi@0:             break;
aoqi@0:         case ret:
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case wide:
aoqi@0:             // must be handled by the caller.
aoqi@0:             return;
aoqi@0:         case monitorenter:
aoqi@0:         case monitorexit:
aoqi@0:             state.pop(1);
aoqi@0:             break;
aoqi@0: 
aoqi@0:         default:
aoqi@0:             throw new AssertionError(mnem(op));
aoqi@0:         }
aoqi@0:         postop();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode with a one-byte operand field.
aoqi@0:      */
aoqi@0:     public void emitop1(int op, int od) {
aoqi@0:         emitop(op);
aoqi@0:         if (!alive) return;
aoqi@0:         emit1(od);
aoqi@0:         switch (op) {
aoqi@0:         case bipush:
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case ldc1:
aoqi@0:             state.push(typeForPool(pool.pool[od]));
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             throw new AssertionError(mnem(op));
aoqi@0:         }
aoqi@0:         postop();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** The type of a constant pool entry. */
aoqi@0:     private Type typeForPool(Object o) {
aoqi@0:         if (o instanceof Integer) return syms.intType;
aoqi@0:         if (o instanceof Float) return syms.floatType;
aoqi@0:         if (o instanceof String) return syms.stringType;
aoqi@0:         if (o instanceof Long) return syms.longType;
aoqi@0:         if (o instanceof Double) return syms.doubleType;
aoqi@0:         if (o instanceof ClassSymbol) return syms.classType;
aoqi@0:         if (o instanceof Pool.MethodHandle) return syms.methodHandleType;
aoqi@0:         if (o instanceof UniqueType) return typeForPool(((UniqueType)o).type);
aoqi@0:         if (o instanceof Type) {
aoqi@0:             Type ty = ((Type)o).unannotatedType();
aoqi@0: 
aoqi@0:             if (ty instanceof Type.ArrayType) return syms.classType;
aoqi@0:             if (ty instanceof Type.MethodType) return syms.methodTypeType;
aoqi@0:         }
aoqi@0:         throw new AssertionError("Invalid type of constant pool entry: " + o.getClass());
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode with a one-byte operand field;
aoqi@0:      *  widen if field does not fit in a byte.
aoqi@0:      */
aoqi@0:     public void emitop1w(int op, int od) {
aoqi@0:         if (od > 0xFF) {
aoqi@0:             emitop(wide);
aoqi@0:             emitop(op);
aoqi@0:             emit2(od);
aoqi@0:         } else {
aoqi@0:             emitop(op);
aoqi@0:             emit1(od);
aoqi@0:         }
aoqi@0:         if (!alive) return;
aoqi@0:         switch (op) {
aoqi@0:         case iload:
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case lload:
aoqi@0:             state.push(syms.longType);
aoqi@0:             break;
aoqi@0:         case fload:
aoqi@0:             state.push(syms.floatType);
aoqi@0:             break;
aoqi@0:         case dload:
aoqi@0:             state.push(syms.doubleType);
aoqi@0:             break;
aoqi@0:         case aload:
aoqi@0:             state.push(lvar[od].sym.type);
aoqi@0:             break;
aoqi@0:         case lstore:
aoqi@0:         case dstore:
aoqi@0:             state.pop(2);
aoqi@0:             break;
aoqi@0:         case istore:
aoqi@0:         case fstore:
aoqi@0:         case astore:
aoqi@0:             state.pop(1);
aoqi@0:             break;
aoqi@0:         case ret:
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             throw new AssertionError(mnem(op));
aoqi@0:         }
aoqi@0:         postop();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode with two one-byte operand fields;
aoqi@0:      *  widen if either field does not fit in a byte.
aoqi@0:      */
aoqi@0:     public void emitop1w(int op, int od1, int od2) {
aoqi@0:         if (od1 > 0xFF || od2 < -128 || od2 > 127) {
aoqi@0:             emitop(wide);
aoqi@0:             emitop(op);
aoqi@0:             emit2(od1);
aoqi@0:             emit2(od2);
aoqi@0:         } else {
aoqi@0:             emitop(op);
aoqi@0:             emit1(od1);
aoqi@0:             emit1(od2);
aoqi@0:         }
aoqi@0:         if (!alive) return;
aoqi@0:         switch (op) {
aoqi@0:         case iinc:
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             throw new AssertionError(mnem(op));
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode with a two-byte operand field.
aoqi@0:      */
aoqi@0:     public void emitop2(int op, int od) {
aoqi@0:         emitop(op);
aoqi@0:         if (!alive) return;
aoqi@0:         emit2(od);
aoqi@0:         switch (op) {
aoqi@0:         case getstatic:
aoqi@0:             state.push(((Symbol)(pool.pool[od])).erasure(types));
aoqi@0:             break;
aoqi@0:         case putstatic:
aoqi@0:             state.pop(((Symbol)(pool.pool[od])).erasure(types));
aoqi@0:             break;
aoqi@0:         case new_:
aoqi@0:             Symbol sym;
aoqi@0:             if (pool.pool[od] instanceof UniqueType) {
aoqi@0:                 // Required by change in Gen.makeRef to allow
aoqi@0:                 // annotated types.
aoqi@0:                 // TODO: is this needed anywhere else?
aoqi@0:                 sym = ((UniqueType)(pool.pool[od])).type.tsym;
aoqi@0:             } else {
aoqi@0:                 sym = (Symbol)(pool.pool[od]);
aoqi@0:             }
aoqi@0:             state.push(uninitializedObject(sym.erasure(types), cp-3));
aoqi@0:             break;
aoqi@0:         case sipush:
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case if_acmp_null:
aoqi@0:         case if_acmp_nonnull:
aoqi@0:         case ifeq:
aoqi@0:         case ifne:
aoqi@0:         case iflt:
aoqi@0:         case ifge:
aoqi@0:         case ifgt:
aoqi@0:         case ifle:
aoqi@0:             state.pop(1);
aoqi@0:             break;
aoqi@0:         case if_icmpeq:
aoqi@0:         case if_icmpne:
aoqi@0:         case if_icmplt:
aoqi@0:         case if_icmpge:
aoqi@0:         case if_icmpgt:
aoqi@0:         case if_icmple:
aoqi@0:         case if_acmpeq:
aoqi@0:         case if_acmpne:
aoqi@0:             state.pop(2);
aoqi@0:             break;
aoqi@0:         case goto_:
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case putfield:
aoqi@0:             state.pop(((Symbol)(pool.pool[od])).erasure(types));
aoqi@0:             state.pop(1); // object ref
aoqi@0:             break;
aoqi@0:         case getfield:
aoqi@0:             state.pop(1); // object ref
aoqi@0:             state.push(((Symbol)(pool.pool[od])).erasure(types));
aoqi@0:             break;
aoqi@0:         case checkcast: {
aoqi@0:             state.pop(1); // object ref
aoqi@0:             Object o = pool.pool[od];
aoqi@0:             Type t = (o instanceof Symbol)
aoqi@0:                 ? ((Symbol)o).erasure(types)
aoqi@0:                 : types.erasure((((UniqueType)o).type));
aoqi@0:             state.push(t);
aoqi@0:             break; }
aoqi@0:         case ldc2w:
aoqi@0:             state.push(typeForPool(pool.pool[od]));
aoqi@0:             break;
aoqi@0:         case instanceof_:
aoqi@0:             state.pop(1);
aoqi@0:             state.push(syms.intType);
aoqi@0:             break;
aoqi@0:         case ldc2:
aoqi@0:             state.push(typeForPool(pool.pool[od]));
aoqi@0:             break;
aoqi@0:         case jsr:
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             throw new AssertionError(mnem(op));
aoqi@0:         }
aoqi@0:         // postop();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit an opcode with a four-byte operand field.
aoqi@0:      */
aoqi@0:     public void emitop4(int op, int od) {
aoqi@0:         emitop(op);
aoqi@0:         if (!alive) return;
aoqi@0:         emit4(od);
aoqi@0:         switch (op) {
aoqi@0:         case goto_w:
aoqi@0:             markDead();
aoqi@0:             break;
aoqi@0:         case jsr_w:
aoqi@0:             break;
aoqi@0:         default:
aoqi@0:             throw new AssertionError(mnem(op));
aoqi@0:         }
aoqi@0:         // postop();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Align code pointer to next `incr' boundary.
aoqi@0:      */
aoqi@0:     public void align(int incr) {
aoqi@0:         if (alive)
aoqi@0:             while (cp % incr != 0) emitop0(nop);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Place a byte into code at address pc.
aoqi@0:      *  Pre: {@literal pc + 1 <= cp }.
aoqi@0:      */
aoqi@0:     private void put1(int pc, int op) {
aoqi@0:         code[pc] = (byte)op;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Place two bytes into code at address pc.
aoqi@0:      *  Pre: {@literal pc + 2 <= cp }.
aoqi@0:      */
aoqi@0:     private void put2(int pc, int od) {
aoqi@0:         // pre: pc + 2 <= cp
aoqi@0:         put1(pc, od >> 8);
aoqi@0:         put1(pc+1, od);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Place four  bytes into code at address pc.
aoqi@0:      *  Pre: {@literal pc + 4 <= cp }.
aoqi@0:      */
aoqi@0:     public void put4(int pc, int od) {
aoqi@0:         // pre: pc + 4 <= cp
aoqi@0:         put1(pc  , od >> 24);
aoqi@0:         put1(pc+1, od >> 16);
aoqi@0:         put1(pc+2, od >> 8);
aoqi@0:         put1(pc+3, od);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Return code byte at position pc as an unsigned int.
aoqi@0:      */
aoqi@0:     private int get1(int pc) {
aoqi@0:         return code[pc] & 0xFF;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Return two code bytes at position pc as an unsigned int.
aoqi@0:      */
aoqi@0:     private int get2(int pc) {
aoqi@0:         return (get1(pc) << 8) | get1(pc+1);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Return four code bytes at position pc as an int.
aoqi@0:      */
aoqi@0:     public int get4(int pc) {
aoqi@0:         // pre: pc + 4 <= cp
aoqi@0:         return
aoqi@0:             (get1(pc) << 24) |
aoqi@0:             (get1(pc+1) << 16) |
aoqi@0:             (get1(pc+2) << 8) |
aoqi@0:             (get1(pc+3));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Is code generation currently enabled?
aoqi@0:      */
aoqi@0:     public boolean isAlive() {
aoqi@0:         return alive || pendingJumps != null;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Switch code generation on/off.
aoqi@0:      */
aoqi@0:     public void markDead() {
aoqi@0:         alive = false;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Declare an entry point; return current code pointer
aoqi@0:      */
aoqi@0:     public int entryPoint() {
aoqi@0:         int pc = curCP();
aoqi@0:         alive = true;
aoqi@0:         pendingStackMap = needStackMap;
aoqi@0:         return pc;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Declare an entry point with initial state;
aoqi@0:      *  return current code pointer
aoqi@0:      */
aoqi@0:     public int entryPoint(State state) {
aoqi@0:         int pc = curCP();
aoqi@0:         alive = true;
aoqi@0:         this.state = state.dup();
aoqi@0:         Assert.check(state.stacksize <= max_stack);
aoqi@0:         if (debugCode) System.err.println("entry point " + state);
aoqi@0:         pendingStackMap = needStackMap;
aoqi@0:         return pc;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Declare an entry point with initial state plus a pushed value;
aoqi@0:      *  return current code pointer
aoqi@0:      */
aoqi@0:     public int entryPoint(State state, Type pushed) {
aoqi@0:         int pc = curCP();
aoqi@0:         alive = true;
aoqi@0:         this.state = state.dup();
aoqi@0:         Assert.check(state.stacksize <= max_stack);
aoqi@0:         this.state.push(pushed);
aoqi@0:         if (debugCode) System.err.println("entry point " + state);
aoqi@0:         pendingStackMap = needStackMap;
aoqi@0:         return pc;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /**************************************************************************
aoqi@0:  * Stack map generation
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** An entry in the stack map. */
aoqi@0:     static class StackMapFrame {
aoqi@0:         int pc;
aoqi@0:         Type[] locals;
aoqi@0:         Type[] stack;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** A buffer of cldc stack map entries. */
aoqi@0:     StackMapFrame[] stackMapBuffer = null;
aoqi@0: 
aoqi@0:     /** A buffer of compressed StackMapTable entries. */
aoqi@0:     StackMapTableFrame[] stackMapTableBuffer = null;
aoqi@0:     int stackMapBufferSize = 0;
aoqi@0: 
aoqi@0:     /** The last PC at which we generated a stack map. */
aoqi@0:     int lastStackMapPC = -1;
aoqi@0: 
aoqi@0:     /** The last stack map frame in StackMapTable. */
aoqi@0:     StackMapFrame lastFrame = null;
aoqi@0: 
aoqi@0:     /** The stack map frame before the last one. */
aoqi@0:     StackMapFrame frameBeforeLast = null;
aoqi@0: 
aoqi@0:     /** Emit a stack map entry.  */
aoqi@0:     public void emitStackMap() {
aoqi@0:         int pc = curCP();
aoqi@0:         if (!needStackMap) return;
aoqi@0: 
aoqi@0: 
aoqi@0: 
aoqi@0:         switch (stackMap) {
aoqi@0:             case CLDC:
aoqi@0:                 emitCLDCStackMap(pc, getLocalsSize());
aoqi@0:                 break;
aoqi@0:             case JSR202:
aoqi@0:                 emitStackMapFrame(pc, getLocalsSize());
aoqi@0:                 break;
aoqi@0:             default:
aoqi@0:                 throw new AssertionError("Should have chosen a stackmap format");
aoqi@0:         }
aoqi@0:         // DEBUG code follows
aoqi@0:         if (debugCode) state.dump(pc);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private int getLocalsSize() {
aoqi@0:         int nextLocal = 0;
aoqi@0:         for (int i=max_locals-1; i>=0; i--) {
aoqi@0:             if (state.defined.isMember(i) && lvar[i] != null) {
aoqi@0:                 nextLocal = i + width(lvar[i].sym.erasure(types));
aoqi@0:                 break;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return nextLocal;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit a CLDC stack map frame. */
aoqi@0:     void emitCLDCStackMap(int pc, int localsSize) {
aoqi@0:         if (lastStackMapPC == pc) {
aoqi@0:             // drop existing stackmap at this offset
aoqi@0:             stackMapBuffer[--stackMapBufferSize] = null;
aoqi@0:         }
aoqi@0:         lastStackMapPC = pc;
aoqi@0: 
aoqi@0:         if (stackMapBuffer == null) {
aoqi@0:             stackMapBuffer = new StackMapFrame[20];
aoqi@0:         } else {
aoqi@0:             stackMapBuffer = ArrayUtils.ensureCapacity(stackMapBuffer, stackMapBufferSize);
aoqi@0:         }
aoqi@0:         StackMapFrame frame =
aoqi@0:             stackMapBuffer[stackMapBufferSize++] = new StackMapFrame();
aoqi@0:         frame.pc = pc;
aoqi@0: 
aoqi@0:         frame.locals = new Type[localsSize];
aoqi@0:         for (int i=0; i<localsSize; i++) {
aoqi@0:             if (state.defined.isMember(i) && lvar[i] != null) {
aoqi@0:                 Type vtype = lvar[i].sym.type;
aoqi@0:                 if (!(vtype instanceof UninitializedType))
aoqi@0:                     vtype = types.erasure(vtype);
aoqi@0:                 frame.locals[i] = vtype;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         frame.stack = new Type[state.stacksize];
aoqi@0:         for (int i=0; i<state.stacksize; i++)
aoqi@0:             frame.stack[i] = state.stack[i];
aoqi@0:     }
aoqi@0: 
aoqi@0:     void emitStackMapFrame(int pc, int localsSize) {
aoqi@0:         if (lastFrame == null) {
aoqi@0:             // first frame
aoqi@0:             lastFrame = getInitialFrame();
aoqi@0:         } else if (lastFrame.pc == pc) {
aoqi@0:             // drop existing stackmap at this offset
aoqi@0:             stackMapTableBuffer[--stackMapBufferSize] = null;
aoqi@0:             lastFrame = frameBeforeLast;
aoqi@0:             frameBeforeLast = null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         StackMapFrame frame = new StackMapFrame();
aoqi@0:         frame.pc = pc;
aoqi@0: 
aoqi@0:         int localCount = 0;
aoqi@0:         Type[] locals = new Type[localsSize];
aoqi@0:         for (int i=0; i<localsSize; i++, localCount++) {
aoqi@0:             if (state.defined.isMember(i) && lvar[i] != null) {
aoqi@0:                 Type vtype = lvar[i].sym.type;
aoqi@0:                 if (!(vtype instanceof UninitializedType))
aoqi@0:                     vtype = types.erasure(vtype);
aoqi@0:                 locals[i] = vtype;
aoqi@0:                 if (width(vtype) > 1) i++;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         frame.locals = new Type[localCount];
aoqi@0:         for (int i=0, j=0; i<localsSize; i++, j++) {
aoqi@0:             Assert.check(j < localCount);
aoqi@0:             frame.locals[j] = locals[i];
aoqi@0:             if (width(locals[i]) > 1) i++;
aoqi@0:         }
aoqi@0: 
aoqi@0:         int stackCount = 0;
aoqi@0:         for (int i=0; i<state.stacksize; i++) {
aoqi@0:             if (state.stack[i] != null) {
aoqi@0:                 stackCount++;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         frame.stack = new Type[stackCount];
aoqi@0:         stackCount = 0;
aoqi@0:         for (int i=0; i<state.stacksize; i++) {
aoqi@0:             if (state.stack[i] != null) {
aoqi@0:                 frame.stack[stackCount++] = types.erasure(state.stack[i]);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (stackMapTableBuffer == null) {
aoqi@0:             stackMapTableBuffer = new StackMapTableFrame[20];
aoqi@0:         } else {
aoqi@0:             stackMapTableBuffer = ArrayUtils.ensureCapacity(
aoqi@0:                                     stackMapTableBuffer,
aoqi@0:                                     stackMapBufferSize);
aoqi@0:         }
aoqi@0:         stackMapTableBuffer[stackMapBufferSize++] =
aoqi@0:                 StackMapTableFrame.getInstance(frame, lastFrame.pc, lastFrame.locals, types);
aoqi@0: 
aoqi@0:         frameBeforeLast = lastFrame;
aoqi@0:         lastFrame = frame;
aoqi@0:     }
aoqi@0: 
aoqi@0:     StackMapFrame getInitialFrame() {
aoqi@0:         StackMapFrame frame = new StackMapFrame();
aoqi@0:         List<Type> arg_types = ((MethodType)meth.externalType(types)).argtypes;
aoqi@0:         int len = arg_types.length();
aoqi@0:         int count = 0;
aoqi@0:         if (!meth.isStatic()) {
aoqi@0:             Type thisType = meth.owner.type;
aoqi@0:             frame.locals = new Type[len+1];
aoqi@0:             if (meth.isConstructor() && thisType != syms.objectType) {
aoqi@0:                 frame.locals[count++] = UninitializedType.uninitializedThis(thisType);
aoqi@0:             } else {
aoqi@0:                 frame.locals[count++] = types.erasure(thisType);
aoqi@0:             }
aoqi@0:         } else {
aoqi@0:             frame.locals = new Type[len];
aoqi@0:         }
aoqi@0:         for (Type arg_type : arg_types) {
aoqi@0:             frame.locals[count++] = types.erasure(arg_type);
aoqi@0:         }
aoqi@0:         frame.pc = -1;
aoqi@0:         frame.stack = null;
aoqi@0:         return frame;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /**************************************************************************
aoqi@0:  * Operations having to do with jumps
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** A chain represents a list of unresolved jumps. Jump locations
aoqi@0:      *  are sorted in decreasing order.
aoqi@0:      */
aoqi@0:     public static class Chain {
aoqi@0: 
aoqi@0:         /** The position of the jump instruction.
aoqi@0:          */
aoqi@0:         public final int pc;
aoqi@0: 
aoqi@0:         /** The machine state after the jump instruction.
aoqi@0:          *  Invariant: all elements of a chain list have the same stacksize
aoqi@0:          *  and compatible stack and register contents.
aoqi@0:          */
aoqi@0:         Code.State state;
aoqi@0: 
aoqi@0:         /** The next jump in the list.
aoqi@0:          */
aoqi@0:         public final Chain next;
aoqi@0: 
aoqi@0:         /** Construct a chain from its jump position, stacksize, previous
aoqi@0:          *  chain, and machine state.
aoqi@0:          */
aoqi@0:         public Chain(int pc, Chain next, Code.State state) {
aoqi@0:             this.pc = pc;
aoqi@0:             this.next = next;
aoqi@0:             this.state = state;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Negate a branch opcode.
aoqi@0:      */
aoqi@0:     public static int negate(int opcode) {
aoqi@0:         if (opcode == if_acmp_null) return if_acmp_nonnull;
aoqi@0:         else if (opcode == if_acmp_nonnull) return if_acmp_null;
aoqi@0:         else return ((opcode + 1) ^ 1) - 1;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit a jump instruction.
aoqi@0:      *  Return code pointer of instruction to be patched.
aoqi@0:      */
aoqi@0:     public int emitJump(int opcode) {
aoqi@0:         if (fatcode) {
aoqi@0:             if (opcode == goto_ || opcode == jsr) {
aoqi@0:                 emitop4(opcode + goto_w - goto_, 0);
aoqi@0:             } else {
aoqi@0:                 emitop2(negate(opcode), 8);
aoqi@0:                 emitop4(goto_w, 0);
aoqi@0:                 alive = true;
aoqi@0:                 pendingStackMap = needStackMap;
aoqi@0:             }
aoqi@0:             return cp - 5;
aoqi@0:         } else {
aoqi@0:             emitop2(opcode, 0);
aoqi@0:             return cp - 3;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Emit a branch with given opcode; return its chain.
aoqi@0:      *  branch differs from jump in that jsr is treated as no-op.
aoqi@0:      */
aoqi@0:     public Chain branch(int opcode) {
aoqi@0:         Chain result = null;
aoqi@0:         if (opcode == goto_) {
aoqi@0:             result = pendingJumps;
aoqi@0:             pendingJumps = null;
aoqi@0:         }
aoqi@0:         if (opcode != dontgoto && isAlive()) {
aoqi@0:             result = new Chain(emitJump(opcode),
aoqi@0:                                result,
aoqi@0:                                state.dup());
aoqi@0:             fixedPc = fatcode;
aoqi@0:             if (opcode == goto_) alive = false;
aoqi@0:         }
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve chain to point to given target.
aoqi@0:      */
aoqi@0:     public void resolve(Chain chain, int target) {
aoqi@0:         boolean changed = false;
aoqi@0:         State newState = state;
aoqi@0:         for (; chain != null; chain = chain.next) {
aoqi@0:             Assert.check(state != chain.state
aoqi@0:                     && (target > chain.pc || state.stacksize == 0));
aoqi@0:             if (target >= cp) {
aoqi@0:                 target = cp;
aoqi@0:             } else if (get1(target) == goto_) {
aoqi@0:                 if (fatcode) target = target + get4(target + 1);
aoqi@0:                 else target = target + get2(target + 1);
aoqi@0:             }
aoqi@0:             if (get1(chain.pc) == goto_ &&
aoqi@0:                 chain.pc + 3 == target && target == cp && !fixedPc) {
aoqi@0:                 // If goto the next instruction, the jump is not needed:
aoqi@0:                 // compact the code.
aoqi@0:                 if (varDebugInfo) {
aoqi@0:                     adjustAliveRanges(cp, -3);
aoqi@0:                 }
aoqi@0:                 cp = cp - 3;
aoqi@0:                 target = target - 3;
aoqi@0:                 if (chain.next == null) {
aoqi@0:                     // This is the only jump to the target. Exit the loop
aoqi@0:                     // without setting new state. The code is reachable
aoqi@0:                     // from the instruction before goto_.
aoqi@0:                     alive = true;
aoqi@0:                     break;
aoqi@0:                 }
aoqi@0:             } else {
aoqi@0:                 if (fatcode)
aoqi@0:                     put4(chain.pc + 1, target - chain.pc);
aoqi@0:                 else if (target - chain.pc < Short.MIN_VALUE ||
aoqi@0:                          target - chain.pc > Short.MAX_VALUE)
aoqi@0:                     fatcode = true;
aoqi@0:                 else
aoqi@0:                     put2(chain.pc + 1, target - chain.pc);
aoqi@0:                 Assert.check(!alive ||
aoqi@0:                     chain.state.stacksize == newState.stacksize &&
aoqi@0:                     chain.state.nlocks == newState.nlocks);
aoqi@0:             }
aoqi@0:             fixedPc = true;
aoqi@0:             if (cp == target) {
aoqi@0:                 changed = true;
aoqi@0:                 if (debugCode)
aoqi@0:                     System.err.println("resolving chain state=" + chain.state);
aoqi@0:                 if (alive) {
aoqi@0:                     newState = chain.state.join(newState);
aoqi@0:                 } else {
aoqi@0:                     newState = chain.state;
aoqi@0:                     alive = true;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:         Assert.check(!changed || state != newState);
aoqi@0:         if (state != newState) {
aoqi@0:             setDefined(newState.defined);
aoqi@0:             state = newState;
aoqi@0:             pendingStackMap = needStackMap;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve chain to point to current code pointer.
aoqi@0:      */
aoqi@0:     public void resolve(Chain chain) {
aoqi@0:         Assert.check(
aoqi@0:             !alive ||
aoqi@0:             chain==null ||
aoqi@0:             state.stacksize == chain.state.stacksize &&
aoqi@0:             state.nlocks == chain.state.nlocks);
aoqi@0:         pendingJumps = mergeChains(chain, pendingJumps);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve any pending jumps.
aoqi@0:      */
aoqi@0:     public void resolvePending() {
aoqi@0:         Chain x = pendingJumps;
aoqi@0:         pendingJumps = null;
aoqi@0:         resolve(x, cp);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Merge the jumps in of two chains into one.
aoqi@0:      */
aoqi@0:     public static Chain mergeChains(Chain chain1, Chain chain2) {
aoqi@0:         // recursive merge sort
aoqi@0:         if (chain2 == null) return chain1;
aoqi@0:         if (chain1 == null) return chain2;
aoqi@0:         Assert.check(
aoqi@0:             chain1.state.stacksize == chain2.state.stacksize &&
aoqi@0:             chain1.state.nlocks == chain2.state.nlocks);
aoqi@0:         if (chain1.pc < chain2.pc)
aoqi@0:             return new Chain(
aoqi@0:                 chain2.pc,
aoqi@0:                 mergeChains(chain1, chain2.next),
aoqi@0:                 chain2.state);
aoqi@0:         return new Chain(
aoqi@0:                 chain1.pc,
aoqi@0:                 mergeChains(chain1.next, chain2),
aoqi@0:                 chain1.state);
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /* **************************************************************************
aoqi@0:  * Catch clauses
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** Add a catch clause to code.
aoqi@0:      */
aoqi@0:     public void addCatch(
aoqi@0:         char startPc, char endPc, char handlerPc, char catchType) {
aoqi@0:             catchInfo.append(new char[]{startPc, endPc, handlerPc, catchType});
aoqi@0:         }
aoqi@0: 
aoqi@0: 
aoqi@0:     public void compressCatchTable() {
aoqi@0:         ListBuffer<char[]> compressedCatchInfo = new ListBuffer<>();
aoqi@0:         List<Integer> handlerPcs = List.nil();
aoqi@0:         for (char[] catchEntry : catchInfo) {
aoqi@0:             handlerPcs = handlerPcs.prepend((int)catchEntry[2]);
aoqi@0:         }
aoqi@0:         for (char[] catchEntry : catchInfo) {
aoqi@0:             int startpc = catchEntry[0];
aoqi@0:             int endpc = catchEntry[1];
aoqi@0:             if (startpc == endpc ||
aoqi@0:                     (startpc == (endpc - 1) &&
aoqi@0:                     handlerPcs.contains(startpc))) {
aoqi@0:                 continue;
aoqi@0:             } else {
aoqi@0:                 compressedCatchInfo.append(catchEntry);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         catchInfo = compressedCatchInfo;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /* **************************************************************************
aoqi@0:  * Line numbers
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** Add a line number entry.
aoqi@0:      */
aoqi@0:     public void addLineNumber(char startPc, char lineNumber) {
aoqi@0:         if (lineDebugInfo) {
aoqi@0:             if (lineInfo.nonEmpty() && lineInfo.head[0] == startPc)
aoqi@0:                 lineInfo = lineInfo.tail;
aoqi@0:             if (lineInfo.isEmpty() || lineInfo.head[1] != lineNumber)
aoqi@0:                 lineInfo = lineInfo.prepend(new char[]{startPc, lineNumber});
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Mark beginning of statement.
aoqi@0:      */
aoqi@0:     public void statBegin(int pos) {
aoqi@0:         if (pos != Position.NOPOS) {
aoqi@0:             pendingStatPos = pos;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Force stat begin eagerly
aoqi@0:      */
aoqi@0:     public void markStatBegin() {
aoqi@0:         if (alive && lineDebugInfo) {
aoqi@0:             int line = lineMap.getLineNumber(pendingStatPos);
aoqi@0:             char cp1 = (char)cp;
aoqi@0:             char line1 = (char)line;
aoqi@0:             if (cp1 == cp && line1 == line)
aoqi@0:                 addLineNumber(cp1, line1);
aoqi@0:         }
aoqi@0:         pendingStatPos = Position.NOPOS;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: /* **************************************************************************
aoqi@0:  * Simulated VM machine state
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     class State implements Cloneable {
aoqi@0:         /** The set of registers containing values. */
aoqi@0:         Bits defined;
aoqi@0: 
aoqi@0:         /** The (types of the) contents of the machine stack. */
aoqi@0:         Type[] stack;
aoqi@0: 
aoqi@0:         /** The first stack position currently unused. */
aoqi@0:         int stacksize;
aoqi@0: 
aoqi@0:         /** The numbers of registers containing locked monitors. */
aoqi@0:         int[] locks;
aoqi@0:         int nlocks;
aoqi@0: 
aoqi@0:         State() {
aoqi@0:             defined = new Bits();
aoqi@0:             stack = new Type[16];
aoqi@0:         }
aoqi@0: 
aoqi@0:         State dup() {
aoqi@0:             try {
aoqi@0:                 State state = (State)super.clone();
aoqi@0:                 state.defined = new Bits(defined);
aoqi@0:                 state.stack = stack.clone();
aoqi@0:                 if (locks != null) state.locks = locks.clone();
aoqi@0:                 if (debugCode) {
aoqi@0:                     System.err.println("duping state " + this);
aoqi@0:                     dump();
aoqi@0:                 }
aoqi@0:                 return state;
aoqi@0:             } catch (CloneNotSupportedException ex) {
aoqi@0:                 throw new AssertionError(ex);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         void lock(int register) {
aoqi@0:             if (locks == null) {
aoqi@0:                 locks = new int[20];
aoqi@0:             } else {
aoqi@0:                 locks = ArrayUtils.ensureCapacity(locks, nlocks);
aoqi@0:             }
aoqi@0:             locks[nlocks] = register;
aoqi@0:             nlocks++;
aoqi@0:         }
aoqi@0: 
aoqi@0:         void unlock(int register) {
aoqi@0:             nlocks--;
aoqi@0:             Assert.check(locks[nlocks] == register);
aoqi@0:             locks[nlocks] = -1;
aoqi@0:         }
aoqi@0: 
aoqi@0:         void push(Type t) {
aoqi@0:             if (debugCode) System.err.println("   pushing " + t);
aoqi@0:             switch (t.getTag()) {
aoqi@0:             case VOID:
aoqi@0:                 return;
aoqi@0:             case BYTE:
aoqi@0:             case CHAR:
aoqi@0:             case SHORT:
aoqi@0:             case BOOLEAN:
aoqi@0:                 t = syms.intType;
aoqi@0:                 break;
aoqi@0:             default:
aoqi@0:                 break;
aoqi@0:             }
aoqi@0:             stack = ArrayUtils.ensureCapacity(stack, stacksize+2);
aoqi@0:             stack[stacksize++] = t;
aoqi@0:             switch (width(t)) {
aoqi@0:             case 1:
aoqi@0:                 break;
aoqi@0:             case 2:
aoqi@0:                 stack[stacksize++] = null;
aoqi@0:                 break;
aoqi@0:             default:
aoqi@0:                 throw new AssertionError(t);
aoqi@0:             }
aoqi@0:             if (stacksize > max_stack)
aoqi@0:                 max_stack = stacksize;
aoqi@0:         }
aoqi@0: 
aoqi@0:         Type pop1() {
aoqi@0:             if (debugCode) System.err.println("   popping " + 1);
aoqi@0:             stacksize--;
aoqi@0:             Type result = stack[stacksize];
aoqi@0:             stack[stacksize] = null;
aoqi@0:             Assert.check(result != null && width(result) == 1);
aoqi@0:             return result;
aoqi@0:         }
aoqi@0: 
aoqi@0:         Type peek() {
aoqi@0:             return stack[stacksize-1];
aoqi@0:         }
aoqi@0: 
aoqi@0:         Type pop2() {
aoqi@0:             if (debugCode) System.err.println("   popping " + 2);
aoqi@0:             stacksize -= 2;
aoqi@0:             Type result = stack[stacksize];
aoqi@0:             stack[stacksize] = null;
aoqi@0:             Assert.check(stack[stacksize+1] == null
aoqi@0:                     && result != null && width(result) == 2);
aoqi@0:             return result;
aoqi@0:         }
aoqi@0: 
aoqi@0:         void pop(int n) {
aoqi@0:             if (debugCode) System.err.println("   popping " + n);
aoqi@0:             while (n > 0) {
aoqi@0:                 stack[--stacksize] = null;
aoqi@0:                 n--;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         void pop(Type t) {
aoqi@0:             pop(width(t));
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** Force the top of the stack to be treated as this supertype
aoqi@0:          *  of its current type. */
aoqi@0:         void forceStackTop(Type t) {
aoqi@0:             if (!alive) return;
aoqi@0:             switch (t.getTag()) {
aoqi@0:             case CLASS:
aoqi@0:             case ARRAY:
aoqi@0:                 int width = width(t);
aoqi@0:                 Type old = stack[stacksize-width];
aoqi@0:                 Assert.check(types.isSubtype(types.erasure(old),
aoqi@0:                                        types.erasure(t)));
aoqi@0:                 stack[stacksize-width] = t;
aoqi@0:                 break;
aoqi@0:             default:
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         void markInitialized(UninitializedType old) {
aoqi@0:             Type newtype = old.initializedType();
aoqi@0:             for (int i=0; i<stacksize; i++) {
aoqi@0:                 if (stack[i] == old) stack[i] = newtype;
aoqi@0:             }
aoqi@0:             for (int i=0; i<lvar.length; i++) {
aoqi@0:                 LocalVar lv = lvar[i];
aoqi@0:                 if (lv != null && lv.sym.type == old) {
aoqi@0:                     VarSymbol sym = lv.sym;
aoqi@0:                     sym = sym.clone(sym.owner);
aoqi@0:                     sym.type = newtype;
aoqi@0:                     LocalVar newlv = lvar[i] = new LocalVar(sym);
aoqi@0:                     newlv.aliveRanges = lv.aliveRanges;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         State join(State other) {
aoqi@0:             defined.andSet(other.defined);
aoqi@0:             Assert.check(stacksize == other.stacksize
aoqi@0:                     && nlocks == other.nlocks);
aoqi@0:             for (int i=0; i<stacksize; ) {
aoqi@0:                 Type t = stack[i];
aoqi@0:                 Type tother = other.stack[i];
aoqi@0:                 Type result =
aoqi@0:                     t==tother ? t :
aoqi@0:                     types.isSubtype(t, tother) ? tother :
aoqi@0:                     types.isSubtype(tother, t) ? t :
aoqi@0:                     error();
aoqi@0:                 int w = width(result);
aoqi@0:                 stack[i] = result;
aoqi@0:                 if (w == 2) Assert.checkNull(stack[i+1]);
aoqi@0:                 i += w;
aoqi@0:             }
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         Type error() {
aoqi@0:             throw new AssertionError("inconsistent stack types at join point");
aoqi@0:         }
aoqi@0: 
aoqi@0:         void dump() {
aoqi@0:             dump(-1);
aoqi@0:         }
aoqi@0: 
aoqi@0:         void dump(int pc) {
aoqi@0:             System.err.print("stackMap for " + meth.owner + "." + meth);
aoqi@0:             if (pc == -1)
aoqi@0:                 System.out.println();
aoqi@0:             else
aoqi@0:                 System.out.println(" at " + pc);
aoqi@0:             System.err.println(" stack (from bottom):");
aoqi@0:             for (int i=0; i<stacksize; i++)
aoqi@0:                 System.err.println("  " + i + ": " + stack[i]);
aoqi@0: 
aoqi@0:             int lastLocal = 0;
aoqi@0:             for (int i=max_locals-1; i>=0; i--) {
aoqi@0:                 if (defined.isMember(i)) {
aoqi@0:                     lastLocal = i;
aoqi@0:                     break;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (lastLocal >= 0)
aoqi@0:                 System.err.println(" locals:");
aoqi@0:             for (int i=0; i<=lastLocal; i++) {
aoqi@0:                 System.err.print("  " + i + ": ");
aoqi@0:                 if (defined.isMember(i)) {
aoqi@0:                     LocalVar var = lvar[i];
aoqi@0:                     if (var == null) {
aoqi@0:                         System.err.println("(none)");
aoqi@0:                     } else if (var.sym == null)
aoqi@0:                         System.err.println("UNKNOWN!");
aoqi@0:                     else
aoqi@0:                         System.err.println("" + var.sym + " of type " +
aoqi@0:                                            var.sym.erasure(types));
aoqi@0:                 } else {
aoqi@0:                     System.err.println("undefined");
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (nlocks != 0) {
aoqi@0:                 System.err.print(" locks:");
aoqi@0:                 for (int i=0; i<nlocks; i++) {
aoqi@0:                     System.err.print(" " + locks[i]);
aoqi@0:                 }
aoqi@0:                 System.err.println();
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     static final Type jsrReturnValue = new JCPrimitiveType(INT, null);
aoqi@0: 
aoqi@0: 
aoqi@0: /* **************************************************************************
aoqi@0:  * Local variables
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** A live range of a local variable. */
aoqi@0:     static class LocalVar {
aoqi@0:         final VarSymbol sym;
aoqi@0:         final char reg;
aoqi@0: 
aoqi@0:         class Range {
aoqi@0:             char start_pc = Character.MAX_VALUE;
aoqi@0:             char length = Character.MAX_VALUE;
aoqi@0: 
aoqi@0:             Range() {}
aoqi@0: 
aoqi@0:             Range(char start) {
aoqi@0:                 this.start_pc = start;
aoqi@0:             }
aoqi@0: 
aoqi@0:             Range(char start, char length) {
aoqi@0:                 this.start_pc = start;
aoqi@0:                 this.length = length;
aoqi@0:             }
aoqi@0: 
aoqi@0:             boolean closed() {
aoqi@0:                 return start_pc != Character.MAX_VALUE && length != Character.MAX_VALUE;
aoqi@0:             }
aoqi@0: 
aoqi@0:             @Override
aoqi@0:             public String toString() {
aoqi@0:                 int currentStartPC = start_pc;
aoqi@0:                 int currentLength = length;
aoqi@0:                 return "startpc = " + currentStartPC + " length " + currentLength;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         java.util.List<Range> aliveRanges = new java.util.ArrayList<>();
aoqi@0: 
aoqi@0:         LocalVar(VarSymbol v) {
aoqi@0:             this.sym = v;
aoqi@0:             this.reg = (char)v.adr;
aoqi@0:         }
aoqi@0:         public LocalVar dup() {
aoqi@0:             return new LocalVar(sym);
aoqi@0:         }
aoqi@0: 
aoqi@0:         Range firstRange() {
aoqi@0:             return aliveRanges.isEmpty() ? null : aliveRanges.get(0);
aoqi@0:         }
aoqi@0: 
aoqi@0:         Range lastRange() {
aoqi@0:             return aliveRanges.isEmpty() ? null : aliveRanges.get(aliveRanges.size() - 1);
aoqi@0:         }
aoqi@0: 
aoqi@0:         void removeLastRange() {
aoqi@0:             Range lastRange = lastRange();
aoqi@0:             if (lastRange != null) {
aoqi@0:                 aliveRanges.remove(lastRange);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:             if (aliveRanges == null) {
aoqi@0:                 return "empty local var";
aoqi@0:             }
aoqi@0:             StringBuilder sb = new StringBuilder().append(sym)
aoqi@0:                     .append(" in register ").append((int)reg).append(" \n");
aoqi@0:             for (Range r : aliveRanges) {
aoqi@0:                 sb.append(" starts at pc=").append(Integer.toString(((int)r.start_pc)))
aoqi@0:                     .append(" length=").append(Integer.toString(((int)r.length)))
aoqi@0:                     .append("\n");
aoqi@0:             }
aoqi@0:             return sb.toString();
aoqi@0:         }
aoqi@0: 
aoqi@0:         public void openRange(char start) {
aoqi@0:             if (!hasOpenRange()) {
aoqi@0:                 aliveRanges.add(new Range(start));
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
vromero@2534:         public void closeRange(char length) {
vromero@2534:             if (isLastRangeInitialized() && length > 0) {
aoqi@0:                 Range range = lastRange();
aoqi@0:                 if (range != null) {
aoqi@0:                     if (range.length == Character.MAX_VALUE) {
vromero@2534:                         range.length = length;
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             } else {
aoqi@0:                 removeLastRange();
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         public boolean hasOpenRange() {
aoqi@0:             if (aliveRanges.isEmpty()) {
aoqi@0:                 return false;
aoqi@0:             }
aoqi@0:             return lastRange().length == Character.MAX_VALUE;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public boolean isLastRangeInitialized() {
aoqi@0:             if (aliveRanges.isEmpty()) {
aoqi@0:                 return false;
aoqi@0:             }
aoqi@0:             return lastRange().start_pc != Character.MAX_VALUE;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public Range getWidestRange() {
aoqi@0:             if (aliveRanges.isEmpty()) {
aoqi@0:                 return new Range();
aoqi@0:             } else {
aoqi@0:                 Range firstRange = firstRange();
aoqi@0:                 Range lastRange = lastRange();
aoqi@0:                 char length = (char)(lastRange.length + (lastRange.start_pc - firstRange.start_pc));
aoqi@0:                 return new Range(firstRange.start_pc, length);
aoqi@0:             }
aoqi@0:          }
aoqi@0: 
aoqi@0:     };
aoqi@0: 
aoqi@0:     /** Local variables, indexed by register. */
aoqi@0:     LocalVar[] lvar;
aoqi@0: 
aoqi@0:     /** Add a new local variable. */
aoqi@0:     private void addLocalVar(VarSymbol v) {
aoqi@0:         int adr = v.adr;
aoqi@0:         lvar = ArrayUtils.ensureCapacity(lvar, adr+1);
aoqi@0:         Assert.checkNull(lvar[adr]);
aoqi@0:         if (pendingJumps != null) {
aoqi@0:             resolvePending();
aoqi@0:         }
aoqi@0:         lvar[adr] = new LocalVar(v);
aoqi@0:         state.defined.excl(adr);
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     public void closeAliveRanges(JCTree tree) {
aoqi@0:         closeAliveRanges(tree, cp);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void closeAliveRanges(JCTree tree, int closingCP) {
aoqi@0:         List<VarSymbol> locals = lvtRanges.getVars(meth, tree);
aoqi@0:         for (LocalVar localVar: lvar) {
aoqi@0:             for (VarSymbol aliveLocal : locals) {
vromero@2595:                 if (localVar != null) {
vromero@2595:                     if (localVar.sym == aliveLocal && localVar.lastRange() != null) {
vromero@2595:                         char length = (char)(closingCP - localVar.lastRange().start_pc);
vromero@2595:                         if (length < Character.MAX_VALUE) {
vromero@2595:                             localVar.closeRange(length);
vromero@2595:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     void adjustAliveRanges(int oldCP, int delta) {
aoqi@0:         for (LocalVar localVar: lvar) {
vromero@2572:             if (localVar != null) {
vromero@2572:                 for (LocalVar.Range range: localVar.aliveRanges) {
vromero@2572:                     if (range.closed() && range.start_pc + range.length >= oldCP) {
vromero@2572:                         range.length += delta;
vromero@2572:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Calculates the size of the LocalVariableTable.
aoqi@0:      */
aoqi@0:     public int getLVTSize() {
aoqi@0:         int result = varBufferSize;
aoqi@0:         for (int i = 0; i < varBufferSize; i++) {
aoqi@0:             LocalVar var = varBuffer[i];
aoqi@0:             result += var.aliveRanges.size() - 1;
aoqi@0:         }
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Set the current variable defined state. */
aoqi@0:     public void setDefined(Bits newDefined) {
aoqi@0:         if (alive && newDefined != state.defined) {
aoqi@0:             Bits diff = new Bits(state.defined).xorSet(newDefined);
aoqi@0:             for (int adr = diff.nextBit(0);
aoqi@0:                  adr >= 0;
aoqi@0:                  adr = diff.nextBit(adr+1)) {
aoqi@0:                 if (adr >= nextreg)
aoqi@0:                     state.defined.excl(adr);
aoqi@0:                 else if (state.defined.isMember(adr))
aoqi@0:                     setUndefined(adr);
aoqi@0:                 else
aoqi@0:                     setDefined(adr);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Mark a register as being (possibly) defined. */
aoqi@0:     public void setDefined(int adr) {
aoqi@0:         LocalVar v = lvar[adr];
aoqi@0:         if (v == null) {
aoqi@0:             state.defined.excl(adr);
aoqi@0:         } else {
aoqi@0:             state.defined.incl(adr);
aoqi@0:             if (cp < Character.MAX_VALUE) {
aoqi@0:                 v.openRange((char)cp);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Mark a register as being undefined. */
aoqi@0:     public void setUndefined(int adr) {
aoqi@0:         state.defined.excl(adr);
aoqi@0:         if (adr < lvar.length &&
aoqi@0:             lvar[adr] != null &&
aoqi@0:             lvar[adr].isLastRangeInitialized()) {
aoqi@0:             LocalVar v = lvar[adr];
aoqi@0:             char length = (char)(curCP() - v.lastRange().start_pc);
vromero@2534:             if (length < Character.MAX_VALUE) {
aoqi@0:                 lvar[adr] = v.dup();
aoqi@0:                 v.closeRange(length);
aoqi@0:                 putVar(v);
aoqi@0:             } else {
aoqi@0:                 v.removeLastRange();
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** End the scope of a variable. */
aoqi@0:     private void endScope(int adr) {
aoqi@0:         LocalVar v = lvar[adr];
aoqi@0:         if (v != null) {
aoqi@0:             if (v.isLastRangeInitialized()) {
aoqi@0:                 char length = (char)(curCP() - v.lastRange().start_pc);
aoqi@0:                 if (length < Character.MAX_VALUE) {
aoqi@0:                     v.closeRange(length);
aoqi@0:                     putVar(v);
aoqi@0:                     fillLocalVarPosition(v);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             /** the call to curCP() can implicitly adjust the current cp, if so
aoqi@0:              * the alive range of local variables may be modified. Thus we need
aoqi@0:              * all of them. For this reason assigning null to the given address
aoqi@0:              * should be the last action to do.
aoqi@0:              */
aoqi@0:             lvar[adr] = null;
aoqi@0:         }
aoqi@0:         state.defined.excl(adr);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private void fillLocalVarPosition(LocalVar lv) {
aoqi@0:         if (lv == null || lv.sym == null || !lv.sym.hasTypeAnnotations())
aoqi@0:             return;
aoqi@0:         for (Attribute.TypeCompound ta : lv.sym.getRawTypeAttributes()) {
aoqi@0:             TypeAnnotationPosition p = ta.position;
aoqi@0:             LocalVar.Range widestRange = lv.getWidestRange();
aoqi@0:             p.lvarOffset = new int[] { (int)widestRange.start_pc };
aoqi@0:             p.lvarLength = new int[] { (int)widestRange.length };
aoqi@0:             p.lvarIndex = new int[] { (int)lv.reg };
aoqi@0:             p.isValidOffset = true;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     // Method to be called after compressCatchTable to
aoqi@0:     // fill in the exception table index for type
aoqi@0:     // annotations on exception parameters.
aoqi@0:     public void fillExceptionParameterPositions() {
aoqi@0:         for (int i = 0; i < varBufferSize; ++i) {
aoqi@0:             LocalVar lv = varBuffer[i];
aoqi@0:             if (lv == null || lv.sym == null
aoqi@0:                     || !lv.sym.hasTypeAnnotations()
aoqi@0:                     || !lv.sym.isExceptionParameter())
aoqi@0:                 continue;
aoqi@0: 
aoqi@0:             for (Attribute.TypeCompound ta : lv.sym.getRawTypeAttributes()) {
aoqi@0:                 TypeAnnotationPosition p = ta.position;
aoqi@0:                 // At this point p.type_index contains the catch type index.
aoqi@0:                 // Use that index to determine the exception table index.
aoqi@0:                 // We can afterwards discard the type_index.
aoqi@0:                 // A TA position is shared for all type annotations in the
aoqi@0:                 // same location; updating one is enough.
aoqi@0:                 // Use -666 as a marker that the exception_index was already updated.
aoqi@0:                 if (p.type_index != -666) {
aoqi@0:                     p.exception_index = findExceptionIndex(p.type_index);
aoqi@0:                     p.type_index = -666;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     private int findExceptionIndex(int catchType) {
aoqi@0:         if (catchType == Integer.MIN_VALUE) {
aoqi@0:             // We didn't set the catch type index correctly.
aoqi@0:             // This shouldn't happen.
aoqi@0:             // TODO: issue error?
aoqi@0:             return -1;
aoqi@0:         }
aoqi@0:         List<char[]> iter = catchInfo.toList();
aoqi@0:         int len = catchInfo.length();
aoqi@0:         for (int i = 0; i < len; ++i) {
aoqi@0:             char[] catchEntry = iter.head;
aoqi@0:             iter = iter.tail;
aoqi@0:             char ct = catchEntry[3];
aoqi@0:             if (catchType == ct) {
aoqi@0:                 return i;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return -1;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Put a live variable range into the buffer to be output to the
aoqi@0:      *  class file.
aoqi@0:      */
aoqi@0:     void putVar(LocalVar var) {
aoqi@0:         // Keep local variables if
aoqi@0:         // 1) we need them for debug information
aoqi@0:         // 2) it is an exception type and it contains type annotations
aoqi@0:         boolean keepLocalVariables = varDebugInfo ||
aoqi@0:             (var.sym.isExceptionParameter() && var.sym.hasTypeAnnotations());
aoqi@0:         if (!keepLocalVariables) return;
aoqi@0:         if ((var.sym.flags() & Flags.SYNTHETIC) != 0) return;
aoqi@0:         if (varBuffer == null)
aoqi@0:             varBuffer = new LocalVar[20];
aoqi@0:         else
aoqi@0:             varBuffer = ArrayUtils.ensureCapacity(varBuffer, varBufferSize);
aoqi@0:         varBuffer[varBufferSize++] = var;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Previously live local variables, to be put into the variable table. */
aoqi@0:     LocalVar[] varBuffer;
aoqi@0:     int varBufferSize;
aoqi@0: 
aoqi@0:     /** Create a new local variable address and return it.
aoqi@0:      */
aoqi@0:     private int newLocal(int typecode) {
aoqi@0:         int reg = nextreg;
aoqi@0:         int w = width(typecode);
aoqi@0:         nextreg = reg + w;
aoqi@0:         if (nextreg > max_locals) max_locals = nextreg;
aoqi@0:         return reg;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private int newLocal(Type type) {
aoqi@0:         return newLocal(typecode(type));
aoqi@0:     }
aoqi@0: 
aoqi@0:     public int newLocal(VarSymbol v) {
aoqi@0:         int reg = v.adr = newLocal(v.erasure(types));
aoqi@0:         addLocalVar(v);
aoqi@0:         return reg;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Start a set of fresh registers.
aoqi@0:      */
aoqi@0:     public void newRegSegment() {
aoqi@0:         nextreg = max_locals;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** End scopes of all variables with registers &ge; first.
aoqi@0:      */
aoqi@0:     public void endScopes(int first) {
aoqi@0:         int prevNextReg = nextreg;
aoqi@0:         nextreg = first;
aoqi@0:         for (int i = nextreg; i < prevNextReg; i++) endScope(i);
aoqi@0:     }
aoqi@0: 
aoqi@0: /**************************************************************************
aoqi@0:  * static tables
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     public static String mnem(int opcode) {
aoqi@0:         return Mneumonics.mnem[opcode];
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static class Mneumonics {
aoqi@0:         private final static String[] mnem = new String[ByteCodeCount];
aoqi@0:         static {
aoqi@0:             mnem[nop] = "nop";
aoqi@0:             mnem[aconst_null] = "aconst_null";
aoqi@0:             mnem[iconst_m1] = "iconst_m1";
aoqi@0:             mnem[iconst_0] = "iconst_0";
aoqi@0:             mnem[iconst_1] = "iconst_1";
aoqi@0:             mnem[iconst_2] = "iconst_2";
aoqi@0:             mnem[iconst_3] = "iconst_3";
aoqi@0:             mnem[iconst_4] = "iconst_4";
aoqi@0:             mnem[iconst_5] = "iconst_5";
aoqi@0:             mnem[lconst_0] = "lconst_0";
aoqi@0:             mnem[lconst_1] = "lconst_1";
aoqi@0:             mnem[fconst_0] = "fconst_0";
aoqi@0:             mnem[fconst_1] = "fconst_1";
aoqi@0:             mnem[fconst_2] = "fconst_2";
aoqi@0:             mnem[dconst_0] = "dconst_0";
aoqi@0:             mnem[dconst_1] = "dconst_1";
aoqi@0:             mnem[bipush] = "bipush";
aoqi@0:             mnem[sipush] = "sipush";
aoqi@0:             mnem[ldc1] = "ldc1";
aoqi@0:             mnem[ldc2] = "ldc2";
aoqi@0:             mnem[ldc2w] = "ldc2w";
aoqi@0:             mnem[iload] = "iload";
aoqi@0:             mnem[lload] = "lload";
aoqi@0:             mnem[fload] = "fload";
aoqi@0:             mnem[dload] = "dload";
aoqi@0:             mnem[aload] = "aload";
aoqi@0:             mnem[iload_0] = "iload_0";
aoqi@0:             mnem[lload_0] = "lload_0";
aoqi@0:             mnem[fload_0] = "fload_0";
aoqi@0:             mnem[dload_0] = "dload_0";
aoqi@0:             mnem[aload_0] = "aload_0";
aoqi@0:             mnem[iload_1] = "iload_1";
aoqi@0:             mnem[lload_1] = "lload_1";
aoqi@0:             mnem[fload_1] = "fload_1";
aoqi@0:             mnem[dload_1] = "dload_1";
aoqi@0:             mnem[aload_1] = "aload_1";
aoqi@0:             mnem[iload_2] = "iload_2";
aoqi@0:             mnem[lload_2] = "lload_2";
aoqi@0:             mnem[fload_2] = "fload_2";
aoqi@0:             mnem[dload_2] = "dload_2";
aoqi@0:             mnem[aload_2] = "aload_2";
aoqi@0:             mnem[iload_3] = "iload_3";
aoqi@0:             mnem[lload_3] = "lload_3";
aoqi@0:             mnem[fload_3] = "fload_3";
aoqi@0:             mnem[dload_3] = "dload_3";
aoqi@0:             mnem[aload_3] = "aload_3";
aoqi@0:             mnem[iaload] = "iaload";
aoqi@0:             mnem[laload] = "laload";
aoqi@0:             mnem[faload] = "faload";
aoqi@0:             mnem[daload] = "daload";
aoqi@0:             mnem[aaload] = "aaload";
aoqi@0:             mnem[baload] = "baload";
aoqi@0:             mnem[caload] = "caload";
aoqi@0:             mnem[saload] = "saload";
aoqi@0:             mnem[istore] = "istore";
aoqi@0:             mnem[lstore] = "lstore";
aoqi@0:             mnem[fstore] = "fstore";
aoqi@0:             mnem[dstore] = "dstore";
aoqi@0:             mnem[astore] = "astore";
aoqi@0:             mnem[istore_0] = "istore_0";
aoqi@0:             mnem[lstore_0] = "lstore_0";
aoqi@0:             mnem[fstore_0] = "fstore_0";
aoqi@0:             mnem[dstore_0] = "dstore_0";
aoqi@0:             mnem[astore_0] = "astore_0";
aoqi@0:             mnem[istore_1] = "istore_1";
aoqi@0:             mnem[lstore_1] = "lstore_1";
aoqi@0:             mnem[fstore_1] = "fstore_1";
aoqi@0:             mnem[dstore_1] = "dstore_1";
aoqi@0:             mnem[astore_1] = "astore_1";
aoqi@0:             mnem[istore_2] = "istore_2";
aoqi@0:             mnem[lstore_2] = "lstore_2";
aoqi@0:             mnem[fstore_2] = "fstore_2";
aoqi@0:             mnem[dstore_2] = "dstore_2";
aoqi@0:             mnem[astore_2] = "astore_2";
aoqi@0:             mnem[istore_3] = "istore_3";
aoqi@0:             mnem[lstore_3] = "lstore_3";
aoqi@0:             mnem[fstore_3] = "fstore_3";
aoqi@0:             mnem[dstore_3] = "dstore_3";
aoqi@0:             mnem[astore_3] = "astore_3";
aoqi@0:             mnem[iastore] = "iastore";
aoqi@0:             mnem[lastore] = "lastore";
aoqi@0:             mnem[fastore] = "fastore";
aoqi@0:             mnem[dastore] = "dastore";
aoqi@0:             mnem[aastore] = "aastore";
aoqi@0:             mnem[bastore] = "bastore";
aoqi@0:             mnem[castore] = "castore";
aoqi@0:             mnem[sastore] = "sastore";
aoqi@0:             mnem[pop] = "pop";
aoqi@0:             mnem[pop2] = "pop2";
aoqi@0:             mnem[dup] = "dup";
aoqi@0:             mnem[dup_x1] = "dup_x1";
aoqi@0:             mnem[dup_x2] = "dup_x2";
aoqi@0:             mnem[dup2] = "dup2";
aoqi@0:             mnem[dup2_x1] = "dup2_x1";
aoqi@0:             mnem[dup2_x2] = "dup2_x2";
aoqi@0:             mnem[swap] = "swap";
aoqi@0:             mnem[iadd] = "iadd";
aoqi@0:             mnem[ladd] = "ladd";
aoqi@0:             mnem[fadd] = "fadd";
aoqi@0:             mnem[dadd] = "dadd";
aoqi@0:             mnem[isub] = "isub";
aoqi@0:             mnem[lsub] = "lsub";
aoqi@0:             mnem[fsub] = "fsub";
aoqi@0:             mnem[dsub] = "dsub";
aoqi@0:             mnem[imul] = "imul";
aoqi@0:             mnem[lmul] = "lmul";
aoqi@0:             mnem[fmul] = "fmul";
aoqi@0:             mnem[dmul] = "dmul";
aoqi@0:             mnem[idiv] = "idiv";
aoqi@0:             mnem[ldiv] = "ldiv";
aoqi@0:             mnem[fdiv] = "fdiv";
aoqi@0:             mnem[ddiv] = "ddiv";
aoqi@0:             mnem[imod] = "imod";
aoqi@0:             mnem[lmod] = "lmod";
aoqi@0:             mnem[fmod] = "fmod";
aoqi@0:             mnem[dmod] = "dmod";
aoqi@0:             mnem[ineg] = "ineg";
aoqi@0:             mnem[lneg] = "lneg";
aoqi@0:             mnem[fneg] = "fneg";
aoqi@0:             mnem[dneg] = "dneg";
aoqi@0:             mnem[ishl] = "ishl";
aoqi@0:             mnem[lshl] = "lshl";
aoqi@0:             mnem[ishr] = "ishr";
aoqi@0:             mnem[lshr] = "lshr";
aoqi@0:             mnem[iushr] = "iushr";
aoqi@0:             mnem[lushr] = "lushr";
aoqi@0:             mnem[iand] = "iand";
aoqi@0:             mnem[land] = "land";
aoqi@0:             mnem[ior] = "ior";
aoqi@0:             mnem[lor] = "lor";
aoqi@0:             mnem[ixor] = "ixor";
aoqi@0:             mnem[lxor] = "lxor";
aoqi@0:             mnem[iinc] = "iinc";
aoqi@0:             mnem[i2l] = "i2l";
aoqi@0:             mnem[i2f] = "i2f";
aoqi@0:             mnem[i2d] = "i2d";
aoqi@0:             mnem[l2i] = "l2i";
aoqi@0:             mnem[l2f] = "l2f";
aoqi@0:             mnem[l2d] = "l2d";
aoqi@0:             mnem[f2i] = "f2i";
aoqi@0:             mnem[f2l] = "f2l";
aoqi@0:             mnem[f2d] = "f2d";
aoqi@0:             mnem[d2i] = "d2i";
aoqi@0:             mnem[d2l] = "d2l";
aoqi@0:             mnem[d2f] = "d2f";
aoqi@0:             mnem[int2byte] = "int2byte";
aoqi@0:             mnem[int2char] = "int2char";
aoqi@0:             mnem[int2short] = "int2short";
aoqi@0:             mnem[lcmp] = "lcmp";
aoqi@0:             mnem[fcmpl] = "fcmpl";
aoqi@0:             mnem[fcmpg] = "fcmpg";
aoqi@0:             mnem[dcmpl] = "dcmpl";
aoqi@0:             mnem[dcmpg] = "dcmpg";
aoqi@0:             mnem[ifeq] = "ifeq";
aoqi@0:             mnem[ifne] = "ifne";
aoqi@0:             mnem[iflt] = "iflt";
aoqi@0:             mnem[ifge] = "ifge";
aoqi@0:             mnem[ifgt] = "ifgt";
aoqi@0:             mnem[ifle] = "ifle";
aoqi@0:             mnem[if_icmpeq] = "if_icmpeq";
aoqi@0:             mnem[if_icmpne] = "if_icmpne";
aoqi@0:             mnem[if_icmplt] = "if_icmplt";
aoqi@0:             mnem[if_icmpge] = "if_icmpge";
aoqi@0:             mnem[if_icmpgt] = "if_icmpgt";
aoqi@0:             mnem[if_icmple] = "if_icmple";
aoqi@0:             mnem[if_acmpeq] = "if_acmpeq";
aoqi@0:             mnem[if_acmpne] = "if_acmpne";
aoqi@0:             mnem[goto_] = "goto_";
aoqi@0:             mnem[jsr] = "jsr";
aoqi@0:             mnem[ret] = "ret";
aoqi@0:             mnem[tableswitch] = "tableswitch";
aoqi@0:             mnem[lookupswitch] = "lookupswitch";
aoqi@0:             mnem[ireturn] = "ireturn";
aoqi@0:             mnem[lreturn] = "lreturn";
aoqi@0:             mnem[freturn] = "freturn";
aoqi@0:             mnem[dreturn] = "dreturn";
aoqi@0:             mnem[areturn] = "areturn";
aoqi@0:             mnem[return_] = "return_";
aoqi@0:             mnem[getstatic] = "getstatic";
aoqi@0:             mnem[putstatic] = "putstatic";
aoqi@0:             mnem[getfield] = "getfield";
aoqi@0:             mnem[putfield] = "putfield";
aoqi@0:             mnem[invokevirtual] = "invokevirtual";
aoqi@0:             mnem[invokespecial] = "invokespecial";
aoqi@0:             mnem[invokestatic] = "invokestatic";
aoqi@0:             mnem[invokeinterface] = "invokeinterface";
aoqi@0:             mnem[invokedynamic] = "invokedynamic";
aoqi@0:             mnem[new_] = "new_";
aoqi@0:             mnem[newarray] = "newarray";
aoqi@0:             mnem[anewarray] = "anewarray";
aoqi@0:             mnem[arraylength] = "arraylength";
aoqi@0:             mnem[athrow] = "athrow";
aoqi@0:             mnem[checkcast] = "checkcast";
aoqi@0:             mnem[instanceof_] = "instanceof_";
aoqi@0:             mnem[monitorenter] = "monitorenter";
aoqi@0:             mnem[monitorexit] = "monitorexit";
aoqi@0:             mnem[wide] = "wide";
aoqi@0:             mnem[multianewarray] = "multianewarray";
aoqi@0:             mnem[if_acmp_null] = "if_acmp_null";
aoqi@0:             mnem[if_acmp_nonnull] = "if_acmp_nonnull";
aoqi@0:             mnem[goto_w] = "goto_w";
aoqi@0:             mnem[jsr_w] = "jsr_w";
aoqi@0:             mnem[breakpoint] = "breakpoint";
aoqi@0:         }
aoqi@0:     }
aoqi@0: }