| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.codegen; |
| |
| import static jdk.internal.org.objectweb.asm.Opcodes.ATHROW; |
| import static jdk.internal.org.objectweb.asm.Opcodes.CHECKCAST; |
| import static jdk.internal.org.objectweb.asm.Opcodes.DUP2; |
| import static jdk.internal.org.objectweb.asm.Opcodes.GETFIELD; |
| import static jdk.internal.org.objectweb.asm.Opcodes.GETSTATIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.GOTO; |
| import static jdk.internal.org.objectweb.asm.Opcodes.H_INVOKESTATIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFEQ; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFGE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFGT; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFLE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFLT; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFNE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFNONNULL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IFNULL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IF_ACMPEQ; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IF_ACMPNE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPEQ; |
| import static jdk.internal.org.objectweb.asm.Opcodes.IF_ICMPNE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.INSTANCEOF; |
| import static jdk.internal.org.objectweb.asm.Opcodes.INVOKEINTERFACE; |
| import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESTATIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.INVOKEVIRTUAL; |
| import static jdk.internal.org.objectweb.asm.Opcodes.NEW; |
| import static jdk.internal.org.objectweb.asm.Opcodes.PUTFIELD; |
| import static jdk.internal.org.objectweb.asm.Opcodes.PUTSTATIC; |
| import static jdk.internal.org.objectweb.asm.Opcodes.RETURN; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.ARGUMENTS; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.CONSTANTS; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.SCOPE; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.THIS; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.THIS_DEBUGGER; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.VARARGS; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.className; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.constructorNoLookup; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.methodDescriptor; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.staticField; |
| import static jdk.nashorn.internal.codegen.CompilerConstants.virtualCallNoLookup; |
| |
| import java.io.PrintStream; |
| import java.lang.reflect.Array; |
| import java.util.EnumSet; |
| import java.util.List; |
| |
| import jdk.internal.dynalink.support.NameCodec; |
| import jdk.internal.org.objectweb.asm.Handle; |
| import jdk.internal.org.objectweb.asm.MethodVisitor; |
| import jdk.nashorn.internal.codegen.ClassEmitter.Flag; |
| import jdk.nashorn.internal.codegen.CompilerConstants.Call; |
| import jdk.nashorn.internal.codegen.CompilerConstants.FieldAccess; |
| import jdk.nashorn.internal.codegen.types.ArrayType; |
| import jdk.nashorn.internal.codegen.types.BitwiseType; |
| import jdk.nashorn.internal.codegen.types.NumericType; |
| import jdk.nashorn.internal.codegen.types.Type; |
| import jdk.nashorn.internal.ir.FunctionNode; |
| import jdk.nashorn.internal.ir.IdentNode; |
| import jdk.nashorn.internal.ir.LexicalContext; |
| import jdk.nashorn.internal.ir.LiteralNode; |
| import jdk.nashorn.internal.ir.RuntimeNode; |
| import jdk.nashorn.internal.ir.Symbol; |
| import jdk.nashorn.internal.runtime.ArgumentSetter; |
| import jdk.nashorn.internal.runtime.Debug; |
| import jdk.nashorn.internal.runtime.DebugLogger; |
| import jdk.nashorn.internal.runtime.JSType; |
| import jdk.nashorn.internal.runtime.ScriptEnvironment; |
| import jdk.nashorn.internal.runtime.ScriptObject; |
| import jdk.nashorn.internal.runtime.linker.Bootstrap; |
| import jdk.nashorn.internal.runtime.options.Options; |
| |
| /** |
| * This is the main function responsible for emitting method code |
| * in a class. It maintains a type stack and keeps track of control |
| * flow to make sure that the registered instructions don't violate |
| * byte code verification. |
| * |
| * Running Nashorn with -ea will assert as soon as a type stack |
| * becomes corrupt, for easier debugging |
| * |
| * Running Nashorn with -Dnashorn.codegen.debug=true will print |
| * all generated bytecode and labels to stderr, for easier debugging, |
| * including bytecode stack contents |
| */ |
| public class MethodEmitter implements Emitter { |
| /** The ASM MethodVisitor we are plugged into */ |
| private final MethodVisitor method; |
| |
| /** Current type stack for current evaluation */ |
| private Label.Stack stack; |
| |
| /** Parent classEmitter representing the class of this method */ |
| private final ClassEmitter classEmitter; |
| |
| /** FunctionNode representing this method, or null if none exists */ |
| protected FunctionNode functionNode; |
| |
| /** Check whether this emitter ever has a function return point */ |
| private boolean hasReturn; |
| |
| /** The script environment */ |
| private final ScriptEnvironment env; |
| |
| /** Threshold in chars for when string constants should be split */ |
| static final int LARGE_STRING_THRESHOLD = 32 * 1024; |
| |
| /** Debug flag, should we dump all generated bytecode along with stacks? */ |
| private static final DebugLogger LOG = new DebugLogger("codegen", "nashorn.codegen.debug"); |
| private static final boolean DEBUG = LOG.isEnabled(); |
| |
| /** dump stack on a particular line, or -1 if disabled */ |
| private static final int DEBUG_TRACE_LINE; |
| |
| static { |
| final String tl = Options.getStringProperty("nashorn.codegen.debug.trace", "-1"); |
| int line = -1; |
| try { |
| line = Integer.parseInt(tl); |
| } catch (final NumberFormatException e) { |
| //fallthru |
| } |
| DEBUG_TRACE_LINE = line; |
| } |
| |
| /** Bootstrap for normal indy:s */ |
| private static final Handle LINKERBOOTSTRAP = new Handle(H_INVOKESTATIC, Bootstrap.BOOTSTRAP.className(), Bootstrap.BOOTSTRAP.name(), Bootstrap.BOOTSTRAP.descriptor()); |
| |
| /** Bootstrap for runtime node indy:s */ |
| private static final Handle RUNTIMEBOOTSTRAP = new Handle(H_INVOKESTATIC, RuntimeCallSite.BOOTSTRAP.className(), RuntimeCallSite.BOOTSTRAP.name(), RuntimeCallSite.BOOTSTRAP.descriptor()); |
| |
| /** |
| * Constructor - internal use from ClassEmitter only |
| * @see ClassEmitter#method |
| * |
| * @param classEmitter the class emitter weaving the class this method is in |
| * @param method a method visitor |
| */ |
| MethodEmitter(final ClassEmitter classEmitter, final MethodVisitor method) { |
| this(classEmitter, method, null); |
| } |
| |
| /** |
| * Constructor - internal use from ClassEmitter only |
| * @see ClassEmitter#method |
| * |
| * @param classEmitter the class emitter weaving the class this method is in |
| * @param method a method visitor |
| * @param functionNode a function node representing this method |
| */ |
| MethodEmitter(final ClassEmitter classEmitter, final MethodVisitor method, final FunctionNode functionNode) { |
| this.env = classEmitter.getEnv(); |
| this.classEmitter = classEmitter; |
| this.method = method; |
| this.functionNode = functionNode; |
| this.stack = null; |
| } |
| |
| /** |
| * Begin a method |
| * @see Emitter |
| */ |
| @Override |
| public void begin() { |
| classEmitter.beginMethod(this); |
| newStack(); |
| method.visitCode(); |
| } |
| |
| /** |
| * End a method |
| * @see Emitter |
| */ |
| @Override |
| public void end() { |
| method.visitMaxs(0, 0); |
| method.visitEnd(); |
| |
| classEmitter.endMethod(this); |
| } |
| |
| private void newStack() { |
| stack = new Label.Stack(); |
| } |
| |
| @Override |
| public String toString() { |
| return "methodEmitter: " + (functionNode == null ? method : functionNode.getName()).toString() + ' ' + Debug.id(this); |
| } |
| |
| /** |
| * Push a type to the existing stack |
| * @param type the type |
| */ |
| private void pushType(final Type type) { |
| if (type != null) { |
| stack.push(type); |
| } |
| } |
| |
| /** |
| * Pop a type from the existing stack |
| * |
| * @param expected expected type - will assert if wrong |
| * |
| * @return the type that was retrieved |
| */ |
| private Type popType(final Type expected) { |
| final Type type = stack.pop(); |
| assert type.isObject() && expected.isObject() || |
| type.isEquivalentTo(expected) : type + " is not compatible with " + expected; |
| return type; |
| } |
| |
| /** |
| * Pop a type from the existing stack, no matter what it is. |
| * |
| * @return the type |
| */ |
| private Type popType() { |
| return stack.pop(); |
| } |
| |
| /** |
| * Pop a type from the existing stack, ensuring that it is numeric, |
| * assert if not |
| * |
| * @return the type |
| */ |
| private NumericType popNumeric() { |
| final Type type = stack.pop(); |
| assert type.isNumeric() : type + " is not numeric"; |
| return (NumericType)type; |
| } |
| |
| /** |
| * Pop a type from the existing stack, ensuring that it is an integer type |
| * (integer or long), assert if not |
| * |
| * @return the type |
| */ |
| private BitwiseType popInteger() { |
| final Type type = stack.pop(); |
| assert type.isInteger() || type.isLong() : type + " is not an integer or long"; |
| return (BitwiseType)type; |
| } |
| |
| /** |
| * Pop a type from the existing stack, ensuring that it is an array type, |
| * assert if not |
| * |
| * @return the type |
| */ |
| private ArrayType popArray() { |
| final Type type = stack.pop(); |
| assert type.isArray() : type; |
| return (ArrayType)type; |
| } |
| |
| /** |
| * Peek a given number of slots from the top of the stack and return the |
| * type in that slot |
| * |
| * @param pos the number of positions from the top, 0 is the top element |
| * |
| * @return the type at position "pos" on the stack |
| */ |
| final Type peekType(final int pos) { |
| return stack.peek(pos); |
| } |
| |
| /** |
| * Peek at the type at the top of the stack |
| * |
| * @return the type at the top of the stack |
| */ |
| final Type peekType() { |
| return stack.peek(); |
| } |
| |
| /** |
| * Generate code a for instantiating a new object and push the |
| * object type on the stack |
| * |
| * @param classDescriptor class descriptor for the object type |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter _new(final String classDescriptor) { |
| debug("new", classDescriptor); |
| method.visitTypeInsn(NEW, classDescriptor); |
| pushType(Type.OBJECT); |
| return this; |
| } |
| |
| /** |
| * Generate code a for instantiating a new object and push the |
| * object type on the stack |
| * |
| * @param clazz class type to instatiate |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter _new(final Class<?> clazz) { |
| return _new(className(clazz)); |
| } |
| |
| /** |
| * Generate code to call the empty constructor for a class |
| * |
| * @param clazz class type to instatiate |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter newInstance(final Class<?> clazz) { |
| return invoke(constructorNoLookup(clazz)); |
| } |
| |
| /** |
| * Perform a dup, that is, duplicate the top element and |
| * push the duplicate down a given number of positions |
| * on the stack. This is totally type agnostic. |
| * |
| * @param depth the depth on which to put the copy |
| * |
| * @return the method emitter, or null if depth is illegal and |
| * has no instruction equivalent. |
| */ |
| MethodEmitter dup(final int depth) { |
| if (peekType().dup(method, depth) == null) { |
| return null; |
| } |
| |
| debug("dup", depth); |
| |
| switch (depth) { |
| case 0: |
| pushType(peekType()); |
| break; |
| case 1: { |
| final Type p0 = popType(); |
| final Type p1 = popType(); |
| pushType(p0); |
| pushType(p1); |
| pushType(p0); |
| break; |
| } |
| case 2: { |
| final Type p0 = popType(); |
| final Type p1 = popType(); |
| final Type p2 = popType(); |
| pushType(p0); |
| pushType(p2); |
| pushType(p1); |
| pushType(p0); |
| break; |
| } |
| default: |
| assert false : "illegal dup depth = " + depth; |
| return null; |
| } |
| |
| return this; |
| } |
| |
| /** |
| * Perform a dup2, that is, duplicate the top element if it |
| * is a category 2 type, or two top elements if they are category |
| * 1 types, and push them on top of the stack |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dup2() { |
| debug("dup2"); |
| |
| if (peekType().isCategory2()) { |
| pushType(peekType()); |
| } else { |
| final Type type = get2(); |
| pushType(type); |
| pushType(type); |
| pushType(type); |
| pushType(type); |
| } |
| method.visitInsn(DUP2); |
| return this; |
| } |
| |
| /** |
| * Duplicate the top element on the stack and push it |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dup() { |
| return dup(0); |
| } |
| |
| /** |
| * Pop the top element of the stack and throw it away |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter pop() { |
| debug("pop", peekType()); |
| popType().pop(method); |
| return this; |
| } |
| |
| /** |
| * Pop the top element of the stack if category 2 type, or the two |
| * top elements of the stack if category 1 types |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter pop2() { |
| if (peekType().isCategory2()) { |
| popType(); |
| } else { |
| get2n(); |
| } |
| return this; |
| } |
| |
| /** |
| * Swap the top two elements of the stack. This is totally |
| * type agnostic and works for all types |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter swap() { |
| debug("swap"); |
| |
| final Type p0 = popType(); |
| final Type p1 = popType(); |
| p0.swap(method, p1); |
| |
| pushType(p0); |
| pushType(p1); |
| debug("after ", p0, p1); |
| return this; |
| } |
| |
| /** |
| * Add a local variable. This is a nop if the symbol has no slot |
| * |
| * @param symbol symbol for the local variable |
| * @param start start of scope |
| * @param end end of scope |
| */ |
| void localVariable(final Symbol symbol, final Label start, final Label end) { |
| if (!symbol.hasSlot()) { |
| return; |
| } |
| |
| String name = symbol.getName(); |
| |
| if (name.equals(THIS.symbolName())) { |
| name = THIS_DEBUGGER.symbolName(); |
| } |
| |
| method.visitLocalVariable(name, symbol.getSymbolType().getDescriptor(), null, start.getLabel(), end.getLabel(), symbol.getSlot()); |
| } |
| |
| /** |
| * Create a new string builder, call the constructor and push the instance to the stack. |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter newStringBuilder() { |
| return invoke(constructorNoLookup(StringBuilder.class)).dup(); |
| } |
| |
| /** |
| * Pop a string and a StringBuilder from the top of the stack and call the append |
| * function of the StringBuilder, appending the string. Pushes the StringBuilder to |
| * the stack when finished. |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter stringBuilderAppend() { |
| convert(Type.STRING); |
| return invoke(virtualCallNoLookup(StringBuilder.class, "append", StringBuilder.class, String.class)); |
| } |
| |
| /** |
| * Pops two integer types from the stack, performs a bitwise and and pushes |
| * the result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter and() { |
| debug("and"); |
| pushType(get2i().and(method)); |
| return this; |
| } |
| |
| /** |
| * Pops two integer types from the stack, performs a bitwise or and pushes |
| * the result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter or() { |
| debug("or"); |
| pushType(get2i().or(method)); |
| return this; |
| } |
| |
| /** |
| * Pops two integer types from the stack, performs a bitwise xor and pushes |
| * the result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter xor() { |
| debug("xor"); |
| pushType(get2i().xor(method)); |
| return this; |
| } |
| |
| /** |
| * Pops two integer types from the stack, performs a bitwise logic shift right and pushes |
| * the result. The shift count, the first element, must be INT. |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter shr() { |
| debug("shr"); |
| popType(Type.INT); |
| pushType(popInteger().shr(method)); |
| return this; |
| } |
| |
| /** |
| * Pops two integer types from the stack, performs a bitwise shift left and and pushes |
| * the result. The shift count, the first element, must be INT. |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter shl() { |
| debug("shl"); |
| popType(Type.INT); |
| pushType(popInteger().shl(method)); |
| return this; |
| } |
| |
| /** |
| * Pops two integer types from the stack, performs a bitwise arithetic shift right and pushes |
| * the result. The shift count, the first element, must be INT. |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter sar() { |
| debug("sar"); |
| popType(Type.INT); |
| pushType(popInteger().sar(method)); |
| return this; |
| } |
| |
| /** |
| * Pops a numeric type from the stack, negates it and pushes the result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter neg() { |
| debug("neg"); |
| pushType(popNumeric().neg(method)); |
| return this; |
| } |
| |
| /** |
| * Add label for the start of a catch block and push the exception to the |
| * stack |
| * |
| * @param recovery label pointing to start of catch block |
| */ |
| void _catch(final Label recovery) { |
| stack.clear(); |
| stack.push(Type.OBJECT); |
| label(recovery); |
| } |
| |
| /** |
| * Start a try/catch block. |
| * |
| * @param entry start label for try |
| * @param exit end label for try |
| * @param recovery start label for catch |
| * @param typeDescriptor type descriptor for exception |
| */ |
| void _try(final Label entry, final Label exit, final Label recovery, final String typeDescriptor) { |
| method.visitTryCatchBlock(entry.getLabel(), exit.getLabel(), recovery.getLabel(), typeDescriptor); |
| } |
| |
| /** |
| * Start a try/catch block. |
| * |
| * @param entry start label for try |
| * @param exit end label for try |
| * @param recovery start label for catch |
| * @param clazz exception class |
| */ |
| void _try(final Label entry, final Label exit, final Label recovery, final Class<?> clazz) { |
| method.visitTryCatchBlock(entry.getLabel(), exit.getLabel(), recovery.getLabel(), CompilerConstants.className(clazz)); |
| } |
| |
| /** |
| * Start a try/catch block. The catch is "Throwable" - i.e. catch-all |
| * |
| * @param entry start label for try |
| * @param exit end label for try |
| * @param recovery start label for catch |
| */ |
| void _try(final Label entry, final Label exit, final Label recovery) { |
| _try(entry, exit, recovery, (String)null); |
| } |
| |
| |
| /** |
| * Load the constants array |
| * @return this method emitter |
| */ |
| MethodEmitter loadConstants() { |
| getStatic(classEmitter.getUnitClassName(), CONSTANTS.symbolName(), CONSTANTS.descriptor()); |
| assert peekType().isArray() : peekType(); |
| return this; |
| } |
| |
| /** |
| * Push the undefined value for the given type, i.e. |
| * UNDEFINED or UNDEFINEDNUMBER. Currently we have no way of |
| * representing UNDEFINED for INTs and LONGs, so they are not |
| * allowed to be local variables (yet) |
| * |
| * @param type the type for which to push UNDEFINED |
| * @return the method emitter |
| */ |
| MethodEmitter loadUndefined(final Type type) { |
| debug("load undefined ", type); |
| pushType(type.loadUndefined(method)); |
| return this; |
| } |
| |
| /** |
| * Push the empty value for the given type, i.e. EMPTY. |
| * |
| * @param type the type |
| * @return the method emitter |
| */ |
| MethodEmitter loadEmpty(final Type type) { |
| debug("load empty ", type); |
| pushType(type.loadEmpty(method)); |
| return this; |
| } |
| |
| /** |
| * Push null to stack |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter loadNull() { |
| debug("aconst_null"); |
| pushType(Type.OBJECT.ldc(method, null)); |
| return this; |
| } |
| |
| /** |
| * Push a handle representing this class top stack |
| * |
| * @param className name of the class |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter loadType(final String className) { |
| debug("load type", className); |
| method.visitLdcInsn(jdk.internal.org.objectweb.asm.Type.getObjectType(className)); |
| pushType(Type.OBJECT); |
| return this; |
| } |
| |
| /** |
| * Push a boolean constant to the stack. |
| * |
| * @param b value of boolean |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final boolean b) { |
| debug("load boolean", b); |
| pushType(Type.BOOLEAN.ldc(method, b)); |
| return this; |
| } |
| |
| /** |
| * Push an int constant to the stack |
| * |
| * @param i value of the int |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final int i) { |
| debug("load int", i); |
| pushType(Type.INT.ldc(method, i)); |
| return this; |
| } |
| |
| /** |
| * Push a double constant to the stack |
| * |
| * @param d value of the double |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final double d) { |
| debug("load double", d); |
| pushType(Type.NUMBER.ldc(method, d)); |
| return this; |
| } |
| |
| /** |
| * Push an long constant to the stack |
| * |
| * @param l value of the long |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final long l) { |
| debug("load long", l); |
| pushType(Type.LONG.ldc(method, l)); |
| return this; |
| } |
| |
| /** |
| * Fetch the length of an array. |
| * @return Array length. |
| */ |
| MethodEmitter arraylength() { |
| debug("arraylength"); |
| popType(Type.OBJECT); |
| pushType(Type.OBJECT_ARRAY.arraylength(method)); |
| return this; |
| } |
| |
| /** |
| * Push a String constant to the stack |
| * |
| * @param s value of the String |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final String s) { |
| debug("load string", s); |
| |
| if (s == null) { |
| loadNull(); |
| return this; |
| } |
| |
| //NASHORN-142 - split too large string |
| final int length = s.length(); |
| if (length > LARGE_STRING_THRESHOLD) { |
| |
| _new(StringBuilder.class); |
| dup(); |
| load(length); |
| invoke(constructorNoLookup(StringBuilder.class, int.class)); |
| |
| for (int n = 0; n < length; n += LARGE_STRING_THRESHOLD) { |
| final String part = s.substring(n, Math.min(n + LARGE_STRING_THRESHOLD, length)); |
| load(part); |
| stringBuilderAppend(); |
| } |
| |
| invoke(virtualCallNoLookup(StringBuilder.class, "toString", String.class)); |
| |
| return this; |
| } |
| |
| pushType(Type.OBJECT.ldc(method, s)); |
| return this; |
| } |
| |
| /** |
| * Push a local variable to the stack. If the symbol representing |
| * the local variable doesn't have a slot, this is a NOP |
| * |
| * @param symbol the symbol representing the local variable. |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final Symbol symbol) { |
| assert symbol != null; |
| if (symbol.hasSlot()) { |
| final int slot = symbol.getSlot(); |
| debug("load symbol", symbol.getName(), " slot=", slot); |
| final Type type = symbol.getSymbolType().load(method, slot); |
| pushType(type == Type.OBJECT && symbol.isThis() ? Type.THIS : type); |
| } else if (symbol.isParam()) { |
| assert !symbol.isScope(); |
| assert functionNode.isVarArg() : "Non-vararg functions have slotted parameters"; |
| final int index = symbol.getFieldIndex(); |
| if (functionNode.needsArguments()) { |
| // ScriptObject.getArgument(int) on arguments |
| debug("load symbol", symbol.getName(), " arguments index=", index); |
| loadCompilerConstant(ARGUMENTS); |
| load(index); |
| ScriptObject.GET_ARGUMENT.invoke(this); |
| } else { |
| // array load from __varargs__ |
| debug("load symbol", symbol.getName(), " array index=", index); |
| loadCompilerConstant(VARARGS); |
| load(symbol.getFieldIndex()); |
| arrayload(); |
| } |
| } |
| return this; |
| } |
| |
| /** |
| * Push a local variable to the stack, given an explicit bytecode slot |
| * This is used e.g. for stub generation where we know where items like |
| * "this" and "scope" reside. |
| * |
| * @param type the type of the variable |
| * @param slot the slot the variable is in |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter load(final Type type, final int slot) { |
| debug("explicit load", type, slot); |
| final Type loadType = type.load(method, slot); |
| pushType(loadType == Type.OBJECT && isThisSlot(slot) ? Type.THIS : loadType); |
| return this; |
| } |
| |
| private boolean isThisSlot(final int slot) { |
| if (functionNode == null) { |
| return slot == CompilerConstants.JAVA_THIS.slot(); |
| } |
| final int thisSlot = compilerConstant(THIS).getSlot(); |
| assert !functionNode.needsCallee() || thisSlot == 1; // needsCallee -> thisSlot == 1 |
| assert functionNode.needsCallee() || thisSlot == 0; // !needsCallee -> thisSlot == 0 |
| return slot == thisSlot; |
| } |
| |
| /** |
| * Push a method handle to the stack |
| * |
| * @param className class name |
| * @param methodName method name |
| * @param descName descriptor |
| * @param flags flags that describe this handle, e.g. invokespecial new, or invoke virtual |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter loadHandle(final String className, final String methodName, final String descName, final EnumSet<Flag> flags) { |
| debug("load handle "); |
| pushType(Type.OBJECT.ldc(method, new Handle(Flag.getValue(flags), className, methodName, descName))); |
| return this; |
| } |
| |
| private Symbol compilerConstant(final CompilerConstants cc) { |
| return functionNode.getBody().getExistingSymbol(cc.symbolName()); |
| } |
| |
| /** |
| * True if this method has a slot allocated for the scope variable (meaning, something in the method actually needs |
| * the scope). |
| * @return if this method has a slot allocated for the scope variable. |
| */ |
| boolean hasScope() { |
| return compilerConstant(SCOPE).hasSlot(); |
| } |
| |
| MethodEmitter loadCompilerConstant(final CompilerConstants cc) { |
| final Symbol symbol = compilerConstant(cc); |
| if (cc == SCOPE && peekType() == Type.SCOPE) { |
| dup(); |
| return this; |
| } |
| return load(symbol); |
| } |
| |
| void storeCompilerConstant(final CompilerConstants cc) { |
| final Symbol symbol = compilerConstant(cc); |
| debug("store compiler constant ", symbol); |
| store(symbol); |
| } |
| |
| /** |
| * Load an element from an array, determining type automatically |
| * @return the method emitter |
| */ |
| MethodEmitter arrayload() { |
| debug("Xaload"); |
| popType(Type.INT); |
| pushType(popArray().aload(method)); |
| return this; |
| } |
| |
| /** |
| * Pop a value, an index and an array from the stack and store |
| * the value at the given index in the array. |
| */ |
| void arraystore() { |
| debug("Xastore"); |
| final Type value = popType(); |
| final Type index = popType(Type.INT); |
| assert index.isInteger() : "array index is not integer, but " + index; |
| final ArrayType array = popArray(); |
| |
| assert value.isEquivalentTo(array.getElementType()) : "Storing "+value+" into "+array; |
| assert array.isObject(); |
| array.astore(method); |
| } |
| |
| /** |
| * Pop a value from the stack and store it in a local variable represented |
| * by the given symbol. If the symbol has no slot, this is a NOP |
| * |
| * @param symbol symbol to store stack to |
| */ |
| void store(final Symbol symbol) { |
| assert symbol != null : "No symbol to store"; |
| if (symbol.hasSlot()) { |
| final int slot = symbol.getSlot(); |
| debug("store symbol", symbol.getName(), " slot=", slot); |
| popType(symbol.getSymbolType()).store(method, slot); |
| } else if (symbol.isParam()) { |
| assert !symbol.isScope(); |
| assert functionNode.isVarArg() : "Non-vararg functions have slotted parameters"; |
| final int index = symbol.getFieldIndex(); |
| if (functionNode.needsArguments()) { |
| debug("store symbol", symbol.getName(), " arguments index=", index); |
| loadCompilerConstant(ARGUMENTS); |
| load(index); |
| ArgumentSetter.SET_ARGUMENT.invoke(this); |
| } else { |
| // varargs without arguments object - just do array store to __varargs__ |
| debug("store symbol", symbol.getName(), " array index=", index); |
| loadCompilerConstant(VARARGS); |
| load(index); |
| ArgumentSetter.SET_ARRAY_ELEMENT.invoke(this); |
| } |
| } |
| } |
| |
| /** |
| * Pop a value from the stack and store it in a given local variable |
| * slot. |
| * |
| * @param type the type to pop |
| * @param slot the slot |
| */ |
| void store(final Type type, final int slot) { |
| popType(type); |
| type.store(method, slot); |
| } |
| |
| /** |
| * Increment/Decrement a local integer by the given value. |
| * |
| * @param slot the int slot |
| * @param increment the amount to increment |
| */ |
| void iinc(final int slot, final int increment) { |
| debug("iinc"); |
| method.visitIincInsn(slot, increment); |
| } |
| |
| /** |
| * Pop an exception object from the stack and generate code |
| * for throwing it |
| */ |
| public void athrow() { |
| debug("athrow"); |
| final Type receiver = popType(Type.OBJECT); |
| assert receiver.isObject(); |
| method.visitInsn(ATHROW); |
| stack = null; |
| } |
| |
| /** |
| * Pop an object from the stack and perform an instanceof |
| * operation, given a classDescriptor to compare it to. |
| * Push the boolean result 1/0 as an int to the stack |
| * |
| * @param classDescriptor descriptor of the class to type check against |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter _instanceof(final String classDescriptor) { |
| debug("instanceof", classDescriptor); |
| popType(Type.OBJECT); |
| method.visitTypeInsn(INSTANCEOF, classDescriptor); |
| pushType(Type.INT); |
| return this; |
| } |
| |
| /** |
| * Pop an object from the stack and perform an instanceof |
| * operation, given a classDescriptor to compare it to. |
| * Push the boolean result 1/0 as an int to the stack |
| * |
| * @param clazz the type to check instanceof against |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter _instanceof(final Class<?> clazz) { |
| return _instanceof(CompilerConstants.className(clazz)); |
| } |
| |
| /** |
| * Perform a checkcast operation on the object at the top of the |
| * stack. |
| * |
| * @param classDescriptor descriptor of the class to type check against |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter checkcast(final String classDescriptor) { |
| debug("checkcast", classDescriptor); |
| assert peekType().isObject(); |
| method.visitTypeInsn(CHECKCAST, classDescriptor); |
| return this; |
| } |
| |
| /** |
| * Perform a checkcast operation on the object at the top of the |
| * stack. |
| * |
| * @param clazz class to checkcast against |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter checkcast(final Class<?> clazz) { |
| return checkcast(CompilerConstants.className(clazz)); |
| } |
| |
| /** |
| * Instantiate a new array given a length that is popped |
| * from the stack and the array type |
| * |
| * @param arrayType the type of the array |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter newarray(final ArrayType arrayType) { |
| debug("newarray ", "arrayType=", arrayType); |
| popType(Type.INT); //LENGTH |
| pushType(arrayType.newarray(method)); |
| return this; |
| } |
| |
| /** |
| * Instantiate a multidimensional array with a given number of dimensions. |
| * On the stack are dim lengths of the sub arrays. |
| * |
| * @param arrayType type of the array |
| * @param dims number of dimensions |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter multinewarray(final ArrayType arrayType, final int dims) { |
| debug("multianewarray ", arrayType, dims); |
| for (int i = 0; i < dims; i++) { |
| popType(Type.INT); //LENGTH |
| } |
| pushType(arrayType.newarray(method, dims)); |
| return this; |
| } |
| |
| /** |
| * Helper function to pop and type check the appropriate arguments |
| * from the stack given a method signature |
| * |
| * @param signature method signature |
| * |
| * @return return type of method |
| */ |
| private Type fixParamStack(final String signature) { |
| final Type[] params = Type.getMethodArguments(signature); |
| for (int i = params.length - 1; i >= 0; i--) { |
| popType(params[i]); |
| } |
| final Type returnType = Type.getMethodReturnType(signature); |
| return returnType; |
| } |
| |
| /** |
| * Generate an invocation to a Call structure |
| * @see CompilerConstants |
| * |
| * @param call the call object |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter invoke(final Call call) { |
| return call.invoke(this); |
| } |
| |
| private MethodEmitter invoke(final int opcode, final String className, final String methodName, final String methodDescriptor, final boolean hasReceiver) { |
| final Type returnType = fixParamStack(methodDescriptor); |
| |
| if (hasReceiver) { |
| popType(Type.OBJECT); |
| } |
| |
| method.visitMethodInsn(opcode, className, methodName, methodDescriptor); |
| |
| if (returnType != null) { |
| pushType(returnType); |
| } |
| |
| return this; |
| } |
| |
| /** |
| * Pop receiver from stack, perform an invoke special |
| * |
| * @param className class name |
| * @param methodName method name |
| * @param methodDescriptor descriptor |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter invokespecial(final String className, final String methodName, final String methodDescriptor) { |
| debug("invokespecial", className, ".", methodName, methodDescriptor); |
| return invoke(INVOKESPECIAL, className, methodName, methodDescriptor, true); |
| } |
| |
| /** |
| * Pop receiver from stack, perform an invoke virtual, push return value if any |
| * |
| * @param className class name |
| * @param methodName method name |
| * @param methodDescriptor descriptor |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter invokevirtual(final String className, final String methodName, final String methodDescriptor) { |
| debug("invokevirtual", className, ".", methodName, methodDescriptor, " ", stack); |
| return invoke(INVOKEVIRTUAL, className, methodName, methodDescriptor, true); |
| } |
| |
| /** |
| * Perform an invoke static and push the return value if any |
| * |
| * @param className class name |
| * @param methodName method name |
| * @param methodDescriptor descriptor |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter invokestatic(final String className, final String methodName, final String methodDescriptor) { |
| debug("invokestatic", className, ".", methodName, methodDescriptor); |
| invoke(INVOKESTATIC, className, methodName, methodDescriptor, false); |
| return this; |
| } |
| |
| /** |
| * Perform an invoke static and replace the return type if we know better, e.g. Global.allocate |
| * that allocates an array should return an ObjectArray type as a NativeArray counts as that |
| * |
| * @param className class name |
| * @param methodName method name |
| * @param methodDescriptor descriptor |
| * @param returnType return type override |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter invokeStatic(final String className, final String methodName, final String methodDescriptor, final Type returnType) { |
| invokestatic(className, methodName, methodDescriptor); |
| popType(); |
| pushType(returnType); |
| return this; |
| } |
| |
| /** |
| * Pop receiver from stack, perform an invoke interface and push return value if any |
| * |
| * @param className class name |
| * @param methodName method name |
| * @param methodDescriptor descriptor |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter invokeinterface(final String className, final String methodName, final String methodDescriptor) { |
| debug("invokeinterface", className, ".", methodName, methodDescriptor); |
| return invoke(INVOKEINTERFACE, className, methodName, methodDescriptor, true); |
| } |
| |
| static jdk.internal.org.objectweb.asm.Label[] getLabels(final Label... table) { |
| final jdk.internal.org.objectweb.asm.Label[] internalLabels = new jdk.internal.org.objectweb.asm.Label[table.length]; |
| for (int i = 0; i < table.length; i++) { |
| internalLabels[i] = table[i].getLabel(); |
| } |
| return internalLabels; |
| } |
| |
| /** |
| * Generate a lookup switch, popping the switch value from the stack |
| * |
| * @param defaultLabel default label |
| * @param values case values for the table |
| * @param table default label |
| */ |
| void lookupswitch(final Label defaultLabel, final int[] values, final Label... table) {//Collection<Label> table) { |
| debug("lookupswitch", peekType()); |
| popType(Type.INT); |
| method.visitLookupSwitchInsn(defaultLabel.getLabel(), values, getLabels(table)); |
| } |
| |
| /** |
| * Generate a table switch |
| * @param lo low value |
| * @param hi high value |
| * @param defaultLabel default label |
| * @param table label table |
| */ |
| void tableswitch(final int lo, final int hi, final Label defaultLabel, final Label... table) { |
| debug("tableswitch", peekType()); |
| popType(Type.INT); |
| method.visitTableSwitchInsn(lo, hi, defaultLabel.getLabel(), getLabels(table)); |
| } |
| |
| /** |
| * Abstraction for performing a conditional jump of any type |
| * |
| * @see MethodEmitter.Condition |
| * |
| * @param cond the condition to test |
| * @param trueLabel the destination label is condition is true |
| */ |
| void conditionalJump(final Condition cond, final Label trueLabel) { |
| conditionalJump(cond, cond != Condition.GT && cond != Condition.GE, trueLabel); |
| } |
| |
| /** |
| * Abstraction for performing a conditional jump of any type, |
| * including a dcmpg/dcmpl semantic for doubles. |
| * |
| * @param cond the condition to test |
| * @param isCmpG is this a dcmpg for numbers, false if it's a dcmpl |
| * @param trueLabel the destination label if condition is true |
| */ |
| void conditionalJump(final Condition cond, final boolean isCmpG, final Label trueLabel) { |
| if (peekType().isCategory2()) { |
| debug("[ld]cmp isCmpG=", isCmpG); |
| pushType(get2n().cmp(method, isCmpG)); |
| jump(Condition.toUnary(cond), trueLabel, 1); |
| } else { |
| debug("if", cond); |
| jump(Condition.toBinary(cond, peekType().isObject()), trueLabel, 2); |
| } |
| } |
| |
| MethodEmitter registerReturn() { |
| this.hasReturn = true; |
| return this; |
| } |
| |
| /** |
| * Perform a non void return, popping the type from the stack |
| * |
| * @param type the type for the return |
| */ |
| void _return(final Type type) { |
| debug("return", type); |
| assert stack.size() == 1 : "Only return value on stack allowed at return point - depth=" + stack.size() + " stack = " + stack; |
| final Type stackType = peekType(); |
| if (!Type.areEquivalent(type, stackType)) { |
| convert(type); |
| } |
| popType(type)._return(method); |
| stack = null; |
| } |
| |
| /** |
| * Perform a return using the stack top value as the guide for the type |
| */ |
| void _return() { |
| _return(peekType()); |
| } |
| |
| /** |
| * Perform a void return. |
| */ |
| void returnVoid() { |
| debug("return [void]"); |
| assert stack.isEmpty() : stack; |
| method.visitInsn(RETURN); |
| stack = null; |
| } |
| |
| /** |
| * Goto, possibly when splitting is taking place. If |
| * a splitNode exists, we need to handle the case that the |
| * jump target is another method |
| * |
| * @param label destination label |
| */ |
| void splitAwareGoto(final LexicalContext lc, final Label label) { |
| _goto(label); |
| } |
| |
| /** |
| * Perform a comparison of two number types that are popped from the stack |
| * |
| * @param isCmpG is this a dcmpg semantic, false if it's a dcmpl semantic |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter cmp(final boolean isCmpG) { |
| pushType(get2n().cmp(method, isCmpG)); |
| return this; |
| } |
| |
| /** |
| * Helper function for jumps, conditional or not |
| * @param opcode opcode for jump |
| * @param label destination |
| * @param n elements on stack to compare, 0-2 |
| */ |
| private void jump(final int opcode, final Label label, final int n) { |
| for (int i = 0; i < n; i++) { |
| assert peekType().isInteger() || peekType().isBoolean() || peekType().isObject() : "expecting integer type or object for jump, but found " + peekType(); |
| popType(); |
| } |
| mergeStackTo(label); |
| method.visitJumpInsn(opcode, label.getLabel()); |
| } |
| |
| /** |
| * Generate an if_acmpeq |
| * |
| * @param label label to true case |
| */ |
| void if_acmpeq(final Label label) { |
| debug("if_acmpeq", label); |
| jump(IF_ACMPEQ, label, 2); |
| } |
| |
| /** |
| * Generate an if_acmpne |
| * |
| * @param label label to true case |
| */ |
| void if_acmpne(final Label label) { |
| debug("if_acmpne", label); |
| jump(IF_ACMPNE, label, 2); |
| } |
| |
| /** |
| * Generate an ifnull |
| * |
| * @param label label to true case |
| */ |
| void ifnull(final Label label) { |
| debug("ifnull", label); |
| jump(IFNULL, label, 1); |
| } |
| |
| /** |
| * Generate an ifnonnull |
| * |
| * @param label label to true case |
| */ |
| void ifnonnull(final Label label) { |
| debug("ifnonnull", label); |
| jump(IFNONNULL, label, 1); |
| } |
| |
| /** |
| * Generate an ifeq |
| * |
| * @param label label to true case |
| */ |
| void ifeq(final Label label) { |
| debug("ifeq ", label); |
| jump(IFEQ, label, 1); |
| } |
| |
| /** |
| * Generate an if_icmpeq |
| * |
| * @param label label to true case |
| */ |
| void if_icmpeq(final Label label) { |
| debug("if_icmpeq", label); |
| jump(IF_ICMPEQ, label, 2); |
| } |
| |
| /** |
| * Generate an if_ne |
| * |
| * @param label label to true case |
| */ |
| void ifne(final Label label) { |
| debug("ifne", label); |
| jump(IFNE, label, 1); |
| } |
| |
| /** |
| * Generate an if_icmpne |
| * |
| * @param label label to true case |
| */ |
| void if_icmpne(final Label label) { |
| debug("if_icmpne", label); |
| jump(IF_ICMPNE, label, 2); |
| } |
| |
| /** |
| * Generate an iflt |
| * |
| * @param label label to true case |
| */ |
| void iflt(final Label label) { |
| debug("iflt", label); |
| jump(IFLT, label, 1); |
| } |
| |
| /** |
| * Generate an ifle |
| * |
| * @param label label to true case |
| */ |
| void ifle(final Label label) { |
| debug("ifle", label); |
| jump(IFLE, label, 1); |
| } |
| |
| /** |
| * Generate an ifgt |
| * |
| * @param label label to true case |
| */ |
| void ifgt(final Label label) { |
| debug("ifgt", label); |
| jump(IFGT, label, 1); |
| } |
| |
| /** |
| * Generate an ifge |
| * |
| * @param label label to true case |
| */ |
| void ifge(final Label label) { |
| debug("ifge", label); |
| jump(IFGE, label, 1); |
| } |
| |
| /** |
| * Unconditional jump to a label |
| * |
| * @param label destination label |
| */ |
| void _goto(final Label label) { |
| //debug("goto", label); |
| jump(GOTO, label, 0); |
| stack = null; //whoever reaches the point after us provides the stack, because we don't |
| } |
| |
| /** |
| * Examine two stacks and make sure they are of the same size and their |
| * contents are equivalent to each other |
| * @param s0 first stack |
| * @param s1 second stack |
| * |
| * @return true if stacks are equivalent, false otherwise |
| */ |
| /** |
| * A join in control flow - helper function that makes sure all entry stacks |
| * discovered for the join point so far are equivalent |
| * |
| * MergeStack: we are about to enter a label. If its stack, label.getStack() is null |
| * we have never been here before. Then we are expected to carry a stack with us. |
| * |
| * @param label label |
| */ |
| private void mergeStackTo(final Label label) { |
| //sometimes we can do a merge stack without having a stack - i.e. when jumping ahead to dead code |
| //see NASHORN-73. So far we had been saved by the line number nodes. This should have been fixed |
| //by Lower removing everything after an unconditionally executed terminating statement OR a break |
| //or continue in a block. Previously code left over after breaks and continues was still there |
| //and caused bytecode to be generated - which crashed on stack not being there, as the merge |
| //was not in fact preceeded by a visit. Furthermore, this led to ASM putting out its NOP NOP NOP |
| //ATHROW sequences instead of no code being generated at all. This should now be fixed. |
| assert stack != null : label + " entered with no stack. deadcode that remains?"; |
| |
| final Label.Stack labelStack = label.getStack(); |
| if (labelStack == null) { |
| label.setStack(stack.copy()); |
| return; |
| } |
| assert stack.isEquivalentTo(labelStack) : "stacks " + stack + " is not equivalent with " + labelStack + " at join point"; |
| } |
| |
| /** |
| * Register a new label, enter it here. |
| * |
| * @param label the label |
| */ |
| void label(final Label label) { |
| /* |
| * If stack == null, this means that we came here not through a fallthrough. |
| * E.g. a label after an athrow. Then we create a new stack if one doesn't exist |
| * for this location already. |
| */ |
| if (stack == null) { |
| stack = label.getStack(); |
| if (stack == null) { |
| newStack(); |
| } |
| } |
| debug_label(label); |
| |
| mergeStackTo(label); //we have to merge our stack to whatever is in the label |
| |
| method.visitLabel(label.getLabel()); |
| } |
| |
| /** |
| * Pop element from stack, convert to given type |
| * |
| * @param to type to convert to |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter convert(final Type to) { |
| final Type type = peekType().convert(method, to); |
| if (type != null) { |
| if (peekType() != to) { |
| debug("convert", peekType(), "->", to); |
| } |
| popType(); |
| pushType(type); |
| } |
| return this; |
| } |
| |
| /** |
| * Helper function - expect two types that are equivalent |
| * |
| * @return common type |
| */ |
| private Type get2() { |
| final Type p0 = popType(); |
| final Type p1 = popType(); |
| assert p0.isEquivalentTo(p1) : "expecting equivalent types on stack but got " + p0 + " and " + p1; |
| return p0; |
| } |
| |
| /** |
| * Helper function - expect two types that are integer types and equivalent |
| * |
| * @return common type |
| */ |
| private BitwiseType get2i() { |
| final BitwiseType p0 = popInteger(); |
| final BitwiseType p1 = popInteger(); |
| assert p0.isEquivalentTo(p1) : "expecting equivalent types on stack but got " + p0 + " and " + p1; |
| return p0; |
| } |
| |
| /** |
| * Helper function - expect two types that are numbers and equivalent |
| * |
| * @return common type |
| */ |
| private NumericType get2n() { |
| final NumericType p0 = popNumeric(); |
| final NumericType p1 = popNumeric(); |
| assert p0.isEquivalentTo(p1) : "expecting equivalent types on stack but got " + p0 + " and " + p1; |
| return p0; |
| } |
| |
| /** |
| * Pop two numbers, perform addition and push result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter add() { |
| debug("add"); |
| pushType(get2().add(method)); |
| return this; |
| } |
| |
| /** |
| * Pop two numbers, perform subtraction and push result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter sub() { |
| debug("sub"); |
| pushType(get2n().sub(method)); |
| return this; |
| } |
| |
| /** |
| * Pop two numbers, perform multiplication and push result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter mul() { |
| debug("mul "); |
| pushType(get2n().mul(method)); |
| return this; |
| } |
| |
| /** |
| * Pop two numbers, perform division and push result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter div() { |
| debug("div"); |
| pushType(get2n().div(method)); |
| return this; |
| } |
| |
| /** |
| * Pop two numbers, calculate remainder and push result |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter rem() { |
| debug("rem"); |
| pushType(get2n().rem(method)); |
| return this; |
| } |
| |
| /** |
| * Retrieve the top <tt>count</tt> types on the stack without modifying it. |
| * |
| * @param count number of types to return |
| * @return array of Types |
| */ |
| protected Type[] getTypesFromStack(final int count) { |
| final Type[] types = new Type[count]; |
| int pos = 0; |
| for (int i = count - 1; i >= 0; i--) { |
| types[i] = stack.peek(pos++); |
| } |
| |
| return types; |
| } |
| |
| /** |
| * Helper function to generate a function signature based on stack contents |
| * and argument count and return type |
| * |
| * @param returnType return type |
| * @param argCount argument count |
| * |
| * @return function signature for stack contents |
| */ |
| private String getDynamicSignature(final Type returnType, final int argCount) { |
| final Type[] paramTypes = new Type[argCount]; |
| |
| int pos = 0; |
| for (int i = argCount - 1; i >= 0; i--) { |
| paramTypes[i] = stack.peek(pos++); |
| } |
| final String descriptor = Type.getMethodDescriptor(returnType, paramTypes); |
| for (int i = 0; i < argCount; i++) { |
| popType(paramTypes[argCount - i - 1]); |
| } |
| |
| return descriptor; |
| } |
| |
| /** |
| * Generate a dynamic new |
| * |
| * @param argCount number of arguments |
| * @param flags callsite flags |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dynamicNew(final int argCount, final int flags) { |
| debug("dynamic_new", "argcount=", argCount); |
| final String signature = getDynamicSignature(Type.OBJECT, argCount); |
| method.visitInvokeDynamicInsn("dyn:new", signature, LINKERBOOTSTRAP, flags); |
| pushType(Type.OBJECT); //TODO fix result type |
| return this; |
| } |
| |
| /** |
| * Generate a dynamic call |
| * |
| * @param returnType return type |
| * @param argCount number of arguments |
| * @param flags callsite flags |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dynamicCall(final Type returnType, final int argCount, final int flags) { |
| debug("dynamic_call", "args=", argCount, "returnType=", returnType); |
| final String signature = getDynamicSignature(returnType, argCount); // +1 because the function itself is the 1st parameter for dynamic calls (what you call - call target) |
| debug(" signature", signature); |
| method.visitInvokeDynamicInsn("dyn:call", signature, LINKERBOOTSTRAP, flags); |
| pushType(returnType); |
| |
| return this; |
| } |
| |
| /** |
| * Generate a dynamic call for a runtime node |
| * |
| * @param name tag for the invoke dynamic for this runtime node |
| * @param returnType return type |
| * @param request RuntimeNode request |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dynamicRuntimeCall(final String name, final Type returnType, final RuntimeNode.Request request) { |
| debug("dynamic_runtime_call", name, "args=", request.getArity(), "returnType=", returnType); |
| final String signature = getDynamicSignature(returnType, request.getArity()); |
| debug(" signature", signature); |
| method.visitInvokeDynamicInsn(name, signature, RUNTIMEBOOTSTRAP); |
| pushType(returnType); |
| |
| return this; |
| } |
| |
| /** |
| * Generate dynamic getter. Pop scope from stack. Push result |
| * |
| * @param valueType type of the value to set |
| * @param name name of property |
| * @param flags call site flags |
| * @param isMethod should it prefer retrieving methods |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dynamicGet(final Type valueType, final String name, final int flags, final boolean isMethod) { |
| debug("dynamic_get", name, valueType); |
| |
| Type type = valueType; |
| if (type.isObject() || type.isBoolean()) { |
| type = Type.OBJECT; //promote e.g strings to object generic setter |
| } |
| |
| popType(Type.SCOPE); |
| method.visitInvokeDynamicInsn((isMethod ? "dyn:getMethod|getProp|getElem:" : "dyn:getProp|getElem|getMethod:") + |
| NameCodec.encode(name), Type.getMethodDescriptor(type, Type.OBJECT), LINKERBOOTSTRAP, flags); |
| |
| pushType(type); |
| |
| convert(valueType); //most probably a nop |
| |
| return this; |
| } |
| |
| /** |
| * Generate dynamic setter. Pop receiver and property from stack. |
| * |
| * @param valueType the type of the value to set |
| * @param name name of property |
| * @param flags call site flags |
| */ |
| void dynamicSet(final Type valueType, final String name, final int flags) { |
| debug("dynamic_set", name, peekType()); |
| |
| Type type = valueType; |
| if (type.isObject() || type.isBoolean()) { //promote strings to objects etc |
| type = Type.OBJECT; |
| convert(Type.OBJECT); //TODO bad- until we specialize boolean setters, |
| } |
| |
| popType(type); |
| popType(Type.SCOPE); |
| |
| method.visitInvokeDynamicInsn("dyn:setProp|setElem:" + NameCodec.encode(name), methodDescriptor(void.class, Object.class, type.getTypeClass()), LINKERBOOTSTRAP, flags); |
| } |
| |
| /** |
| * Dynamic getter for indexed structures. Pop index and receiver from stack, |
| * generate appropriate signatures based on types |
| * |
| * @param result result type for getter |
| * @param flags call site flags for getter |
| * @param isMethod should it prefer retrieving methods |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter dynamicGetIndex(final Type result, final int flags, final boolean isMethod) { |
| debug("dynamic_get_index", peekType(1), "[", peekType(), "]"); |
| |
| Type resultType = result; |
| if (result.isBoolean()) { |
| resultType = Type.OBJECT; // INT->OBJECT to avoid another dimension of cross products in the getters. TODO |
| } |
| |
| Type index = peekType(); |
| if (index.isObject() || index.isBoolean()) { |
| index = Type.OBJECT; //e.g. string->object |
| convert(Type.OBJECT); |
| } |
| popType(); |
| |
| popType(Type.OBJECT); |
| |
| final String signature = Type.getMethodDescriptor(resultType, Type.OBJECT /*e.g STRING->OBJECT*/, index); |
| |
| method.visitInvokeDynamicInsn(isMethod ? "dyn:getMethod|getElem|getProp" : "dyn:getElem|getProp|getMethod", |
| signature, LINKERBOOTSTRAP, flags); |
| pushType(resultType); |
| |
| if (result.isBoolean()) { |
| convert(Type.BOOLEAN); |
| } |
| |
| return this; |
| } |
| |
| /** |
| * Dynamic setter for indexed structures. Pop value, index and receiver from |
| * stack, generate appropriate signature based on types |
| * |
| * @param flags call site flags for setter |
| */ |
| void dynamicSetIndex(final int flags) { |
| debug("dynamic_set_index", peekType(2), "[", peekType(1), "] =", peekType()); |
| |
| Type value = peekType(); |
| if (value.isObject() || value.isBoolean()) { |
| value = Type.OBJECT; //e.g. STRING->OBJECT - one descriptor for all object types |
| convert(Type.OBJECT); |
| } |
| popType(); |
| |
| Type index = peekType(); |
| if (index.isObject() || index.isBoolean()) { |
| index = Type.OBJECT; //e.g. string->object |
| convert(Type.OBJECT); |
| } |
| popType(index); |
| |
| final Type receiver = popType(Type.OBJECT); |
| assert receiver.isObject(); |
| |
| method.visitInvokeDynamicInsn("dyn:setElem|setProp", methodDescriptor(void.class, receiver.getTypeClass(), index.getTypeClass(), value.getTypeClass()), LINKERBOOTSTRAP, flags); |
| } |
| |
| /** |
| * Load a key value in the proper form. |
| * |
| * @param key |
| */ |
| //TODO move this and break it apart |
| MethodEmitter loadKey(final Object key) { |
| if (key instanceof IdentNode) { |
| method.visitLdcInsn(((IdentNode) key).getName()); |
| } else if (key instanceof LiteralNode) { |
| method.visitLdcInsn(((LiteralNode<?>)key).getString()); |
| } else { |
| method.visitLdcInsn(JSType.toString(key)); |
| } |
| pushType(Type.OBJECT); //STRING |
| return this; |
| } |
| |
| @SuppressWarnings("fallthrough") |
| private static Type fieldType(final String desc) { |
| switch (desc) { |
| case "Z": |
| case "B": |
| case "C": |
| case "S": |
| case "I": |
| return Type.INT; |
| case "F": |
| assert false; |
| case "D": |
| return Type.NUMBER; |
| case "J": |
| return Type.LONG; |
| default: |
| assert desc.startsWith("[") || desc.startsWith("L") : desc + " is not an object type"; |
| switch (desc.charAt(0)) { |
| case 'L': |
| return Type.OBJECT; |
| case '[': |
| return Type.typeFor(Array.newInstance(fieldType(desc.substring(1)).getTypeClass(), 0).getClass()); |
| default: |
| assert false; |
| } |
| return Type.OBJECT; |
| } |
| } |
| |
| /** |
| * Generate get for a field access |
| * |
| * @param fa the field access |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter getField(final FieldAccess fa) { |
| return fa.get(this); |
| } |
| |
| /** |
| * Generate set for a field access |
| * |
| * @param fa the field access |
| */ |
| void putField(final FieldAccess fa) { |
| fa.put(this); |
| } |
| |
| /** |
| * Get the value of a non-static field, pop the receiver from the stack, |
| * push value to the stack |
| * |
| * @param className class |
| * @param fieldName field name |
| * @param fieldDescriptor field descriptor |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter getField(final String className, final String fieldName, final String fieldDescriptor) { |
| debug("getfield", "receiver=", peekType(), className, ".", fieldName, fieldDescriptor); |
| final Type receiver = popType(); |
| assert receiver.isObject(); |
| method.visitFieldInsn(GETFIELD, className, fieldName, fieldDescriptor); |
| pushType(fieldType(fieldDescriptor)); |
| return this; |
| } |
| |
| /** |
| * Get the value of a static field, push it to the stack |
| * |
| * @param className class |
| * @param fieldName field name |
| * @param fieldDescriptor field descriptor |
| * |
| * @return the method emitter |
| */ |
| MethodEmitter getStatic(final String className, final String fieldName, final String fieldDescriptor) { |
| debug("getstatic", className, ".", fieldName, ".", fieldDescriptor); |
| method.visitFieldInsn(GETSTATIC, className, fieldName, fieldDescriptor); |
| pushType(fieldType(fieldDescriptor)); |
| return this; |
| } |
| |
| /** |
| * Pop value and field from stack and write to a non-static field |
| * |
| * @param className class |
| * @param fieldName field name |
| * @param fieldDescriptor field descriptor |
| */ |
| void putField(final String className, final String fieldName, final String fieldDescriptor) { |
| debug("putfield", "receiver=", peekType(1), "value=", peekType()); |
| popType(fieldType(fieldDescriptor)); |
| popType(Type.OBJECT); |
| method.visitFieldInsn(PUTFIELD, className, fieldName, fieldDescriptor); |
| } |
| |
| /** |
| * Pop value from stack and write to a static field |
| * |
| * @param className class |
| * @param fieldName field name |
| * @param fieldDescriptor field descriptor |
| */ |
| void putStatic(final String className, final String fieldName, final String fieldDescriptor) { |
| debug("putfield", "value=", peekType()); |
| popType(fieldType(fieldDescriptor)); |
| method.visitFieldInsn(PUTSTATIC, className, fieldName, fieldDescriptor); |
| } |
| |
| /** |
| * Register line number at a label |
| * |
| * @param line line number |
| * @param label label |
| */ |
| void lineNumber(final int line) { |
| if (env._debug_lines) { |
| debug_label("[LINE]", line); |
| final jdk.internal.org.objectweb.asm.Label l = new jdk.internal.org.objectweb.asm.Label(); |
| method.visitLabel(l); |
| method.visitLineNumber(line, l); |
| } |
| } |
| |
| /* |
| * Debugging below |
| */ |
| |
| private final FieldAccess ERR_STREAM = staticField(System.class, "err", PrintStream.class); |
| private final Call PRINT = virtualCallNoLookup(PrintStream.class, "print", void.class, Object.class); |
| private final Call PRINTLN = virtualCallNoLookup(PrintStream.class, "println", void.class, Object.class); |
| private final Call PRINT_STACKTRACE = virtualCallNoLookup(Throwable.class, "printStackTrace", void.class); |
| |
| /** |
| * Emit a System.err.print statement of whatever is on top of the bytecode stack |
| */ |
| void print() { |
| getField(ERR_STREAM); |
| swap(); |
| convert(Type.OBJECT); |
| invoke(PRINT); |
| } |
| |
| /** |
| * Emit a System.err.println statement of whatever is on top of the bytecode stack |
| */ |
| void println() { |
| getField(ERR_STREAM); |
| swap(); |
| convert(Type.OBJECT); |
| invoke(PRINTLN); |
| } |
| |
| /** |
| * Emit a System.err.print statement |
| * @param string string to print |
| */ |
| void print(final String string) { |
| getField(ERR_STREAM); |
| load(string); |
| invoke(PRINT); |
| } |
| |
| /** |
| * Emit a System.err.println statement |
| * @param string string to print |
| */ |
| void println(final String string) { |
| getField(ERR_STREAM); |
| load(string); |
| invoke(PRINTLN); |
| } |
| |
| /** |
| * Print a stacktrace to S |
| */ |
| void stacktrace() { |
| _new(Throwable.class); |
| dup(); |
| invoke(constructorNoLookup(Throwable.class)); |
| invoke(PRINT_STACKTRACE); |
| } |
| |
| private static int linePrefix = 0; |
| |
| /** |
| * Debug function that outputs generated bytecode and stack contents |
| * |
| * @param args debug information to print |
| */ |
| private void debug(final Object... args) { |
| debug(30, args); |
| } |
| |
| /** |
| * Debug function that outputs generated bytecode and stack contents |
| * for a label - indentation is currently the only thing that differs |
| * |
| * @param args debug information to print |
| */ |
| private void debug_label(final Object... args) { |
| debug(26, args); |
| } |
| |
| private void debug(final int padConstant, final Object... args) { |
| if (DEBUG) { |
| final StringBuilder sb = new StringBuilder(); |
| int pad; |
| |
| sb.append('#'); |
| sb.append(++linePrefix); |
| |
| pad = 5 - sb.length(); |
| while (pad > 0) { |
| sb.append(' '); |
| pad--; |
| } |
| |
| if (stack != null && !stack.isEmpty()) { |
| sb.append("{"); |
| sb.append(stack.size()); |
| sb.append(":"); |
| for (int pos = 0; pos < stack.size(); pos++) { |
| final Type t = stack.peek(pos); |
| |
| if (t == Type.SCOPE) { |
| sb.append("scope"); |
| } else if (t == Type.THIS) { |
| sb.append("this"); |
| } else if (t.isObject()) { |
| String desc = t.getDescriptor(); |
| int i; |
| for (i = 0; desc.charAt(i) == '[' && i < desc.length(); i++) { |
| sb.append('['); |
| } |
| desc = desc.substring(i); |
| final int slash = desc.lastIndexOf('/'); |
| if (slash != -1) { |
| desc = desc.substring(slash + 1, desc.length() - 1); |
| } |
| if ("Object".equals(desc)) { |
| sb.append('O'); |
| } else { |
| sb.append(desc); |
| } |
| } else { |
| sb.append(t.getDescriptor()); |
| } |
| |
| if (pos + 1 < stack.size()) { |
| sb.append(' '); |
| } |
| } |
| sb.append('}'); |
| sb.append(' '); |
| } |
| |
| pad = padConstant - sb.length(); |
| while (pad > 0) { |
| sb.append(' '); |
| pad--; |
| } |
| |
| for (final Object arg : args) { |
| sb.append(arg); |
| sb.append(' '); |
| } |
| |
| if (env != null) { //early bootstrap code doesn't have inited context yet |
| LOG.info(sb); |
| if (DEBUG_TRACE_LINE == linePrefix) { |
| new Throwable().printStackTrace(LOG.getOutputStream()); |
| } |
| } |
| |
| } |
| } |
| |
| /** |
| * Set the current function node being emitted |
| * @param functionNode the function node |
| */ |
| void setFunctionNode(final FunctionNode functionNode) { |
| this.functionNode = functionNode; |
| } |
| |
| boolean hasReturn() { |
| return hasReturn; |
| } |
| |
| List<Label> getExternalTargets() { |
| return null; |
| } |
| |
| } |