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org.objectweb.asm.util.CheckMethodAdapter Maven / Gradle / Ivy
Utilities for ASM, a very small and fast Java bytecode manipulation framework
// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package org.objectweb.asm.util;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ConstantDynamic;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.TypePath;
import org.objectweb.asm.TypeReference;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.analysis.Analyzer;
import org.objectweb.asm.tree.analysis.AnalyzerException;
import org.objectweb.asm.tree.analysis.BasicValue;
import org.objectweb.asm.tree.analysis.BasicVerifier;
/**
* A {@link MethodVisitor} that checks that its methods are properly used. More precisely this
* method adapter checks each instruction individually, i.e., each visit method checks some
* preconditions based only on its arguments - such as the fact that the given opcode is
* correct for a given visit method. This adapter can also perform some basic data flow checks (more
* precisely those that can be performed without the full class hierarchy - see {@link
* org.objectweb.asm.tree.analysis.BasicVerifier}). For instance in a method whose signature is
* void m () , the invalid instruction IRETURN, or the invalid sequence IADD L2I will be
* detected if the data flow checks are enabled. These checks are enabled by using the {@link
* #CheckMethodAdapter(int,String,String,MethodVisitor,Map)} constructor. They are not performed if
* any other constructor is used.
*
* @author Eric Bruneton
*/
public class CheckMethodAdapter extends MethodVisitor {
/** The 'generic' instruction visit methods (i.e. those that take an opcode argument). */
private enum Method {
VISIT_INSN,
VISIT_INT_INSN,
VISIT_VAR_INSN,
VISIT_TYPE_INSN,
VISIT_FIELD_INSN,
VISIT_METHOD_INSN,
VISIT_JUMP_INSN
}
/** The method to use to visit each instruction. Only generic methods are represented here. */
private static final Method[] OPCODE_METHODS = {
Method.VISIT_INSN, // NOP
Method.VISIT_INSN, // ACONST_NULL
Method.VISIT_INSN, // ICONST_M1
Method.VISIT_INSN, // ICONST_0
Method.VISIT_INSN, // ICONST_1
Method.VISIT_INSN, // ICONST_2
Method.VISIT_INSN, // ICONST_3
Method.VISIT_INSN, // ICONST_4
Method.VISIT_INSN, // ICONST_5
Method.VISIT_INSN, // LCONST_0
Method.VISIT_INSN, // LCONST_1
Method.VISIT_INSN, // FCONST_0
Method.VISIT_INSN, // FCONST_1
Method.VISIT_INSN, // FCONST_2
Method.VISIT_INSN, // DCONST_0
Method.VISIT_INSN, // DCONST_1
Method.VISIT_INT_INSN, // BIPUSH
Method.VISIT_INT_INSN, // SIPUSH
null, // LDC
null, // LDC_W
null, // LDC2_W
Method.VISIT_VAR_INSN, // ILOAD
Method.VISIT_VAR_INSN, // LLOAD
Method.VISIT_VAR_INSN, // FLOAD
Method.VISIT_VAR_INSN, // DLOAD
Method.VISIT_VAR_INSN, // ALOAD
null, // ILOAD_0
null, // ILOAD_1
null, // ILOAD_2
null, // ILOAD_3
null, // LLOAD_0
null, // LLOAD_1
null, // LLOAD_2
null, // LLOAD_3
null, // FLOAD_0
null, // FLOAD_1
null, // FLOAD_2
null, // FLOAD_3
null, // DLOAD_0
null, // DLOAD_1
null, // DLOAD_2
null, // DLOAD_3
null, // ALOAD_0
null, // ALOAD_1
null, // ALOAD_2
null, // ALOAD_3
Method.VISIT_INSN, // IALOAD
Method.VISIT_INSN, // LALOAD
Method.VISIT_INSN, // FALOAD
Method.VISIT_INSN, // DALOAD
Method.VISIT_INSN, // AALOAD
Method.VISIT_INSN, // BALOAD
Method.VISIT_INSN, // CALOAD
Method.VISIT_INSN, // SALOAD
Method.VISIT_VAR_INSN, // ISTORE
Method.VISIT_VAR_INSN, // LSTORE
Method.VISIT_VAR_INSN, // FSTORE
Method.VISIT_VAR_INSN, // DSTORE
Method.VISIT_VAR_INSN, // ASTORE
null, // ISTORE_0
null, // ISTORE_1
null, // ISTORE_2
null, // ISTORE_3
null, // LSTORE_0
null, // LSTORE_1
null, // LSTORE_2
null, // LSTORE_3
null, // FSTORE_0
null, // FSTORE_1
null, // FSTORE_2
null, // FSTORE_3
null, // DSTORE_0
null, // DSTORE_1
null, // DSTORE_2
null, // DSTORE_3
null, // ASTORE_0
null, // ASTORE_1
null, // ASTORE_2
null, // ASTORE_3
Method.VISIT_INSN, // IASTORE
Method.VISIT_INSN, // LASTORE
Method.VISIT_INSN, // FASTORE
Method.VISIT_INSN, // DASTORE
Method.VISIT_INSN, // AASTORE
Method.VISIT_INSN, // BASTORE
Method.VISIT_INSN, // CASTORE
Method.VISIT_INSN, // SASTORE
Method.VISIT_INSN, // POP
Method.VISIT_INSN, // POP2
Method.VISIT_INSN, // DUP
Method.VISIT_INSN, // DUP_X1
Method.VISIT_INSN, // DUP_X2
Method.VISIT_INSN, // DUP2
Method.VISIT_INSN, // DUP2_X1
Method.VISIT_INSN, // DUP2_X2
Method.VISIT_INSN, // SWAP
Method.VISIT_INSN, // IADD
Method.VISIT_INSN, // LADD
Method.VISIT_INSN, // FADD
Method.VISIT_INSN, // DADD
Method.VISIT_INSN, // ISUB
Method.VISIT_INSN, // LSUB
Method.VISIT_INSN, // FSUB
Method.VISIT_INSN, // DSUB
Method.VISIT_INSN, // IMUL
Method.VISIT_INSN, // LMUL
Method.VISIT_INSN, // FMUL
Method.VISIT_INSN, // DMUL
Method.VISIT_INSN, // IDIV
Method.VISIT_INSN, // LDIV
Method.VISIT_INSN, // FDIV
Method.VISIT_INSN, // DDIV
Method.VISIT_INSN, // IREM
Method.VISIT_INSN, // LREM
Method.VISIT_INSN, // FREM
Method.VISIT_INSN, // DREM
Method.VISIT_INSN, // INEG
Method.VISIT_INSN, // LNEG
Method.VISIT_INSN, // FNEG
Method.VISIT_INSN, // DNEG
Method.VISIT_INSN, // ISHL
Method.VISIT_INSN, // LSHL
Method.VISIT_INSN, // ISHR
Method.VISIT_INSN, // LSHR
Method.VISIT_INSN, // IUSHR
Method.VISIT_INSN, // LUSHR
Method.VISIT_INSN, // IAND
Method.VISIT_INSN, // LAND
Method.VISIT_INSN, // IOR
Method.VISIT_INSN, // LOR
Method.VISIT_INSN, // IXOR
Method.VISIT_INSN, // LXOR
null, // IINC
Method.VISIT_INSN, // I2L
Method.VISIT_INSN, // I2F
Method.VISIT_INSN, // I2D
Method.VISIT_INSN, // L2I
Method.VISIT_INSN, // L2F
Method.VISIT_INSN, // L2D
Method.VISIT_INSN, // F2I
Method.VISIT_INSN, // F2L
Method.VISIT_INSN, // F2D
Method.VISIT_INSN, // D2I
Method.VISIT_INSN, // D2L
Method.VISIT_INSN, // D2F
Method.VISIT_INSN, // I2B
Method.VISIT_INSN, // I2C
Method.VISIT_INSN, // I2S
Method.VISIT_INSN, // LCMP
Method.VISIT_INSN, // FCMPL
Method.VISIT_INSN, // FCMPG
Method.VISIT_INSN, // DCMPL
Method.VISIT_INSN, // DCMPG
Method.VISIT_JUMP_INSN, // IFEQ
Method.VISIT_JUMP_INSN, // IFNE
Method.VISIT_JUMP_INSN, // IFLT
Method.VISIT_JUMP_INSN, // IFGE
Method.VISIT_JUMP_INSN, // IFGT
Method.VISIT_JUMP_INSN, // IFLE
Method.VISIT_JUMP_INSN, // IF_ICMPEQ
Method.VISIT_JUMP_INSN, // IF_ICMPNE
Method.VISIT_JUMP_INSN, // IF_ICMPLT
Method.VISIT_JUMP_INSN, // IF_ICMPGE
Method.VISIT_JUMP_INSN, // IF_ICMPGT
Method.VISIT_JUMP_INSN, // IF_ICMPLE
Method.VISIT_JUMP_INSN, // IF_ACMPEQ
Method.VISIT_JUMP_INSN, // IF_ACMPNE
Method.VISIT_JUMP_INSN, // GOTO
Method.VISIT_JUMP_INSN, // JSR
Method.VISIT_VAR_INSN, // RET
null, // TABLESWITCH
null, // LOOKUPSWITCH
Method.VISIT_INSN, // IRETURN
Method.VISIT_INSN, // LRETURN
Method.VISIT_INSN, // FRETURN
Method.VISIT_INSN, // DRETURN
Method.VISIT_INSN, // ARETURN
Method.VISIT_INSN, // RETURN
Method.VISIT_FIELD_INSN, // GETSTATIC
Method.VISIT_FIELD_INSN, // PUTSTATIC
Method.VISIT_FIELD_INSN, // GETFIELD
Method.VISIT_FIELD_INSN, // PUTFIELD
Method.VISIT_METHOD_INSN, // INVOKEVIRTUAL
Method.VISIT_METHOD_INSN, // INVOKESPECIAL
Method.VISIT_METHOD_INSN, // INVOKESTATIC
Method.VISIT_METHOD_INSN, // INVOKEINTERFACE
null, // INVOKEDYNAMIC
Method.VISIT_TYPE_INSN, // NEW
Method.VISIT_INT_INSN, // NEWARRAY
Method.VISIT_TYPE_INSN, // ANEWARRAY
Method.VISIT_INSN, // ARRAYLENGTH
Method.VISIT_INSN, // ATHROW
Method.VISIT_TYPE_INSN, // CHECKCAST
Method.VISIT_TYPE_INSN, // INSTANCEOF
Method.VISIT_INSN, // MONITORENTER
Method.VISIT_INSN, // MONITOREXIT
null, // WIDE
null, // MULTIANEWARRAY
Method.VISIT_JUMP_INSN, // IFNULL
Method.VISIT_JUMP_INSN // IFNONNULL
};
private static final String INVALID = "Invalid ";
private static final String INVALID_DESCRIPTOR = "Invalid descriptor: ";
private static final String INVALID_TYPE_REFERENCE = "Invalid type reference sort 0x";
private static final String INVALID_LOCAL_VARIABLE_INDEX = "Invalid local variable index";
private static final String MUST_NOT_BE_NULL_OR_EMPTY = " (must not be null or empty)";
private static final String START_LABEL = "start label";
private static final String END_LABEL = "end label";
/** The class version number. */
public int version;
/** The access flags of the visited method. */
private int access;
/**
* The number of method parameters that can have runtime visible annotations. 0 means that all the
* parameters from the method descriptor can have annotations.
*/
private int visibleAnnotableParameterCount;
/**
* The number of method parameters that can have runtime invisible annotations. 0 means that all
* the parameters from the method descriptor can have annotations.
*/
private int invisibleAnnotableParameterCount;
/** Whether the {@link #visitCode} method has been called. */
private boolean visitCodeCalled;
/** Whether the {@link #visitMaxs} method has been called. */
private boolean visitMaxCalled;
/** Whether the {@link #visitEnd} method has been called. */
private boolean visitEndCalled;
/** The number of visited instructions so far. */
private int insnCount;
/** The index of the instruction designated by each visited label. */
private final Map labelInsnIndices;
/** The labels referenced by the visited method. */
private Set referencedLabels;
/** The index of the instruction corresponding to the last visited stack map frame. */
private int lastFrameInsnIndex = -1;
/** The number of visited frames in expanded form. */
private int numExpandedFrames;
/** The number of visited frames in compressed form. */
private int numCompressedFrames;
/**
* The exception handler ranges. Each pair of list element contains the start and end labels of an
* exception handler block.
*/
private List handlers;
/**
* Constructs a new {@link CheckMethodAdapter} object. This method adapter will not perform any
* data flow check (see {@link #CheckMethodAdapter(int,String,String,MethodVisitor,Map)}).
* Subclasses must not use this constructor . Instead, they must use the {@link
* #CheckMethodAdapter(int, MethodVisitor, Map)} version.
*
* @param methodvisitor the method visitor to which this adapter must delegate calls.
*/
public CheckMethodAdapter(final MethodVisitor methodvisitor) {
this(methodvisitor, new HashMap());
}
/**
* Constructs a new {@link CheckMethodAdapter} object. This method adapter will not perform any
* data flow check (see {@link #CheckMethodAdapter(int,String,String,MethodVisitor,Map)}).
* Subclasses must not use this constructor . Instead, they must use the {@link
* #CheckMethodAdapter(int, MethodVisitor, Map)} version.
*
* @param methodVisitor the method visitor to which this adapter must delegate calls.
* @param labelInsnIndices the index of the instruction designated by each visited label so far
* (in other methods). This map is updated with the labels from the visited method.
* @throws IllegalStateException If a subclass calls this constructor.
*/
public CheckMethodAdapter(
final MethodVisitor methodVisitor, final Map labelInsnIndices) {
this(Opcodes.ASM6, methodVisitor, labelInsnIndices);
if (getClass() != CheckMethodAdapter.class) {
throw new IllegalStateException();
}
}
/**
* Constructs a new {@link CheckMethodAdapter} object. This method adapter will not perform any
* data flow check (see {@link #CheckMethodAdapter(int,String,String,MethodVisitor,Map)}).
*
* @param api the ASM API version implemented by this CheckMethodAdapter. Must be one of {@link
* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link
* Opcodes#ASM7_EXPERIMENTAL}.
* @param methodVisitor the method visitor to which this adapter must delegate calls.
* @param labelInsnIndices the index of the instruction designated by each visited label so far
* (in other methods). This map is updated with the labels from the visited method.
*/
protected CheckMethodAdapter(
final int api,
final MethodVisitor methodVisitor,
final Map labelInsnIndices) {
super(api, methodVisitor);
this.labelInsnIndices = labelInsnIndices;
this.referencedLabels = new HashSet();
this.handlers = new ArrayList();
}
/**
* Constructs a new {@link CheckMethodAdapter} object. This method adapter will perform basic data
* flow checks. For instance in a method whose signature is void m () , the invalid
* instruction IRETURN, or the invalid sequence IADD L2I will be detected. Subclasses must not
* use this constructor . Instead, they must use the {@link
* #CheckMethodAdapter(int,int,String,String,MethodVisitor,Map)} version.
*
* @param access the method's access flags.
* @param name the method's name.
* @param descriptor the method's descriptor (see {@link Type}).
* @param methodVisitor the method visitor to which this adapter must delegate calls.
* @param labelInsnIndices the index of the instruction designated by each visited label so far
* (in other methods). This map is updated with the labels from the visited method.
*/
public CheckMethodAdapter(
final int access,
final String name,
final String descriptor,
final MethodVisitor methodVisitor,
final Map labelInsnIndices) {
this(Opcodes.ASM6, access, name, descriptor, methodVisitor, labelInsnIndices);
if (getClass() != CheckMethodAdapter.class) {
throw new IllegalStateException();
}
}
/**
* Constructs a new {@link CheckMethodAdapter} object. This method adapter will perform basic data
* flow checks. For instance in a method whose signature is void m () , the invalid
* instruction IRETURN, or the invalid sequence IADD L2I will be detected.
*
* @param api the ASM API version implemented by this CheckMethodAdapter. Must be one of {@link
* Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link
* Opcodes#ASM7_EXPERIMENTAL}.
* @param access the method's access flags.
* @param name the method's name.
* @param descriptor the method's descriptor (see {@link Type}).
* @param methodVisitor the method visitor to which this adapter must delegate calls.
* @param labelInsnIndices the index of the instruction designated by each visited label so far
* (in other methods). This map is updated with the labels from the visited method.
*/
protected CheckMethodAdapter(
final int api,
final int access,
final String name,
final String descriptor,
final MethodVisitor methodVisitor,
final Map labelInsnIndices) {
this(
api,
new MethodNode(api, access, name, descriptor, null, null) {
@Override
public void visitEnd() {
Analyzer analyzer = new Analyzer(new BasicVerifier());
try {
analyzer.analyze("dummy", this);
} catch (IndexOutOfBoundsException e) {
if (maxLocals == 0 && maxStack == 0) {
throw new IllegalArgumentException(
"Data flow checking option requires valid, non zero maxLocals and maxStack.");
}
throwError(analyzer, e);
} catch (AnalyzerException e) {
throwError(analyzer, e);
}
accept(methodVisitor);
}
private void throwError(final Analyzer analyzer, final Exception e) {
StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter(stringWriter, true);
CheckClassAdapter.printAnalyzerResult(this, analyzer, printWriter);
printWriter.close();
throw new IllegalArgumentException(e.getMessage() + ' ' + stringWriter.toString(), e);
}
},
labelInsnIndices);
this.access = access;
}
@Override
public void visitParameter(final String name, final int access) {
if (name != null) {
checkUnqualifiedName(version, name, "name");
}
CheckClassAdapter.checkAccess(
access, Opcodes.ACC_FINAL + Opcodes.ACC_MANDATED + Opcodes.ACC_SYNTHETIC);
super.visitParameter(name, access);
}
@Override
public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
checkVisitEndNotCalled();
checkDescriptor(version, descriptor, false);
return new CheckAnnotationAdapter(super.visitAnnotation(descriptor, visible));
}
@Override
public AnnotationVisitor visitTypeAnnotation(
final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
checkVisitEndNotCalled();
int sort = new TypeReference(typeRef).getSort();
if (sort != TypeReference.METHOD_TYPE_PARAMETER
&& sort != TypeReference.METHOD_TYPE_PARAMETER_BOUND
&& sort != TypeReference.METHOD_RETURN
&& sort != TypeReference.METHOD_RECEIVER
&& sort != TypeReference.METHOD_FORMAL_PARAMETER
&& sort != TypeReference.THROWS) {
throw new IllegalArgumentException(INVALID_TYPE_REFERENCE + Integer.toHexString(sort));
}
CheckClassAdapter.checkTypeRef(typeRef);
CheckMethodAdapter.checkDescriptor(version, descriptor, false);
return new CheckAnnotationAdapter(
super.visitTypeAnnotation(typeRef, typePath, descriptor, visible));
}
@Override
public AnnotationVisitor visitAnnotationDefault() {
checkVisitEndNotCalled();
return new CheckAnnotationAdapter(super.visitAnnotationDefault(), false);
}
@Override
public void visitAnnotableParameterCount(final int parameterCount, final boolean visible) {
checkVisitEndNotCalled();
if (visible) {
visibleAnnotableParameterCount = parameterCount;
} else {
invisibleAnnotableParameterCount = parameterCount;
}
super.visitAnnotableParameterCount(parameterCount, visible);
}
@Override
public AnnotationVisitor visitParameterAnnotation(
final int parameter, final String descriptor, final boolean visible) {
checkVisitEndNotCalled();
if ((visible
&& visibleAnnotableParameterCount > 0
&& parameter >= visibleAnnotableParameterCount)
|| (!visible
&& invisibleAnnotableParameterCount > 0
&& parameter >= invisibleAnnotableParameterCount)) {
throw new IllegalArgumentException("Invalid parameter index");
}
checkDescriptor(version, descriptor, false);
return new CheckAnnotationAdapter(
super.visitParameterAnnotation(parameter, descriptor, visible));
}
@Override
public void visitAttribute(final Attribute attribute) {
checkVisitEndNotCalled();
if (attribute == null) {
throw new IllegalArgumentException("Invalid attribute (must not be null)");
}
super.visitAttribute(attribute);
}
@Override
public void visitCode() {
if ((access & Opcodes.ACC_ABSTRACT) != 0) {
throw new UnsupportedOperationException("Abstract methods cannot have code");
}
visitCodeCalled = true;
super.visitCode();
}
@Override
public void visitFrame(
final int type,
final int nLocal,
final Object[] local,
final int nStack,
final Object[] stack) {
if (insnCount == lastFrameInsnIndex) {
throw new IllegalStateException("At most one frame can be visited at a given code location.");
}
lastFrameInsnIndex = insnCount;
int mLocal;
int mStack;
switch (type) {
case Opcodes.F_NEW:
case Opcodes.F_FULL:
mLocal = Integer.MAX_VALUE;
mStack = Integer.MAX_VALUE;
break;
case Opcodes.F_SAME:
mLocal = 0;
mStack = 0;
break;
case Opcodes.F_SAME1:
mLocal = 0;
mStack = 1;
break;
case Opcodes.F_APPEND:
case Opcodes.F_CHOP:
mLocal = 3;
mStack = 0;
break;
default:
throw new IllegalArgumentException("Invalid frame type " + type);
}
if (nLocal > mLocal) {
throw new IllegalArgumentException("Invalid nLocal=" + nLocal + " for frame type " + type);
}
if (nStack > mStack) {
throw new IllegalArgumentException("Invalid nStack=" + nStack + " for frame type " + type);
}
if (type != Opcodes.F_CHOP) {
if (nLocal > 0 && (local == null || local.length < nLocal)) {
throw new IllegalArgumentException("Array local[] is shorter than nLocal");
}
for (int i = 0; i < nLocal; ++i) {
checkFrameValue(local[i]);
}
}
if (nStack > 0 && (stack == null || stack.length < nStack)) {
throw new IllegalArgumentException("Array stack[] is shorter than nStack");
}
for (int i = 0; i < nStack; ++i) {
checkFrameValue(stack[i]);
}
if (type == Opcodes.F_NEW) {
++numExpandedFrames;
} else {
++numCompressedFrames;
}
if (numExpandedFrames > 0 && numCompressedFrames > 0) {
throw new IllegalArgumentException("Expanded and compressed frames must not be mixed.");
}
super.visitFrame(type, nLocal, local, nStack, stack);
}
@Override
public void visitInsn(final int opcode) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_INSN);
super.visitInsn(opcode);
++insnCount;
}
@Override
public void visitIntInsn(final int opcode, final int operand) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_INT_INSN);
switch (opcode) {
case Opcodes.BIPUSH:
checkSignedByte(operand, "Invalid operand");
break;
case Opcodes.SIPUSH:
checkSignedShort(operand, "Invalid operand");
break;
case Opcodes.NEWARRAY:
if (operand < Opcodes.T_BOOLEAN || operand > Opcodes.T_LONG) {
throw new IllegalArgumentException(
"Invalid operand (must be an array type code T_...): " + operand);
}
break;
default:
throw new AssertionError();
}
super.visitIntInsn(opcode, operand);
++insnCount;
}
@Override
public void visitVarInsn(final int opcode, final int var) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_VAR_INSN);
checkUnsignedShort(var, INVALID_LOCAL_VARIABLE_INDEX);
super.visitVarInsn(opcode, var);
++insnCount;
}
@Override
public void visitTypeInsn(final int opcode, final String type) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_TYPE_INSN);
checkInternalName(version, type, "type");
if (opcode == Opcodes.NEW && type.charAt(0) == '[') {
throw new IllegalArgumentException("NEW cannot be used to create arrays: " + type);
}
super.visitTypeInsn(opcode, type);
++insnCount;
}
@Override
public void visitFieldInsn(
final int opcode, final String owner, final String name, final String descriptor) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_FIELD_INSN);
checkInternalName(version, owner, "owner");
checkUnqualifiedName(version, name, "name");
checkDescriptor(version, descriptor, false);
super.visitFieldInsn(opcode, owner, name, descriptor);
++insnCount;
}
/** @deprecated */
@Deprecated
@Override
public void visitMethodInsn(
final int opcode, final String owner, final String name, final String descriptor) {
if (api >= Opcodes.ASM5) {
super.visitMethodInsn(opcode, owner, name, descriptor);
return;
}
doVisitMethodInsn(opcode, owner, name, descriptor, opcode == Opcodes.INVOKEINTERFACE);
}
@Override
public void visitMethodInsn(
final int opcode,
final String owner,
final String name,
final String descriptor,
final boolean isInterface) {
if (api < Opcodes.ASM5) {
super.visitMethodInsn(opcode, owner, name, descriptor, isInterface);
return;
}
doVisitMethodInsn(opcode, owner, name, descriptor, isInterface);
}
private void doVisitMethodInsn(
final int opcode,
final String owner,
final String name,
final String descriptor,
final boolean isInterface) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_METHOD_INSN);
if (opcode != Opcodes.INVOKESPECIAL || !"".equals(name)) {
checkMethodIdentifier(version, name, "name");
}
checkInternalName(version, owner, "owner");
checkMethodDescriptor(version, descriptor);
if (opcode == Opcodes.INVOKEVIRTUAL && isInterface) {
throw new IllegalArgumentException("INVOKEVIRTUAL can't be used with interfaces");
}
if (opcode == Opcodes.INVOKEINTERFACE && !isInterface) {
throw new IllegalArgumentException("INVOKEINTERFACE can't be used with classes");
}
if (opcode == Opcodes.INVOKESPECIAL && isInterface && (version & 0xFFFF) < Opcodes.V1_8) {
throw new IllegalArgumentException(
"INVOKESPECIAL can't be used with interfaces prior to Java 8");
}
// Calling super.visitMethodInsn requires to call the correct version depending on this.api
// (otherwise infinite loops can occur). To simplify and to make it easier to automatically
// remove the backward compatibility code, we inline the code of the overridden method here.
if (mv != null) {
mv.visitMethodInsn(opcode, owner, name, descriptor, isInterface);
}
++insnCount;
}
@Override
public void visitInvokeDynamicInsn(
final String name,
final String descriptor,
final Handle bootstrapMethodHandle,
final Object... bootstrapMethodArguments) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkMethodIdentifier(version, name, "name");
checkMethodDescriptor(version, descriptor);
if (bootstrapMethodHandle.getTag() != Opcodes.H_INVOKESTATIC
&& bootstrapMethodHandle.getTag() != Opcodes.H_NEWINVOKESPECIAL) {
throw new IllegalArgumentException("invalid handle tag " + bootstrapMethodHandle.getTag());
}
for (Object bootstrapMethodArgument : bootstrapMethodArguments) {
checkLdcConstant(bootstrapMethodArgument);
}
super.visitInvokeDynamicInsn(name, descriptor, bootstrapMethodHandle, bootstrapMethodArguments);
++insnCount;
}
@Override
public void visitJumpInsn(final int opcode, final Label label) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkOpcodeMethod(opcode, Method.VISIT_JUMP_INSN);
checkLabel(label, false, "label");
super.visitJumpInsn(opcode, label);
referencedLabels.add(label);
++insnCount;
}
@Override
public void visitLabel(final Label label) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkLabel(label, false, "label");
if (labelInsnIndices.get(label) != null) {
throw new IllegalArgumentException("Already visited label");
}
labelInsnIndices.put(label, insnCount);
super.visitLabel(label);
}
@Override
public void visitLdcInsn(final Object value) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkLdcConstant(value);
super.visitLdcInsn(value);
++insnCount;
}
@Override
public void visitIincInsn(final int var, final int increment) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkUnsignedShort(var, INVALID_LOCAL_VARIABLE_INDEX);
checkSignedShort(increment, "Invalid increment");
super.visitIincInsn(var, increment);
++insnCount;
}
@Override
public void visitTableSwitchInsn(
final int min, final int max, final Label dflt, final Label... labels) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
if (max < min) {
throw new IllegalArgumentException(
"Max = " + max + " must be greater than or equal to min = " + min);
}
checkLabel(dflt, false, "default label");
if (labels == null || labels.length != max - min + 1) {
throw new IllegalArgumentException("There must be max - min + 1 labels");
}
for (int i = 0; i < labels.length; ++i) {
checkLabel(labels[i], false, "label at index " + i);
}
super.visitTableSwitchInsn(min, max, dflt, labels);
for (int i = 0; i < labels.length; ++i) {
referencedLabels.add(labels[i]);
}
++insnCount;
}
@Override
public void visitLookupSwitchInsn(final Label dflt, final int[] keys, final Label[] labels) {
checkVisitMaxsNotCalled();
checkVisitCodeCalled();
checkLabel(dflt, false, "default label");
if (keys == null || labels == null || keys.length != labels.length) {
throw new IllegalArgumentException("There must be the same number of keys and labels");
}
for (int i = 0; i < labels.length; ++i) {
checkLabel(labels[i], false, "label at index " + i);
}
super.visitLookupSwitchInsn(dflt, keys, labels);
referencedLabels.add(dflt);
for (int i = 0; i < labels.length; ++i) {
referencedLabels.add(labels[i]);
}
++insnCount;
}
@Override
public void visitMultiANewArrayInsn(final String descriptor, final int numDimensions) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkDescriptor(version, descriptor, false);
if (descriptor.charAt(0) != '[') {
throw new IllegalArgumentException(
"Invalid descriptor (must be an array type descriptor): " + descriptor);
}
if (numDimensions < 1) {
throw new IllegalArgumentException(
"Invalid dimensions (must be greater than 0): " + numDimensions);
}
if (numDimensions > descriptor.lastIndexOf('[') + 1) {
throw new IllegalArgumentException(
"Invalid dimensions (must not be greater than numDimensions(descriptor)): "
+ numDimensions);
}
super.visitMultiANewArrayInsn(descriptor, numDimensions);
++insnCount;
}
@Override
public AnnotationVisitor visitInsnAnnotation(
final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
int sort = new TypeReference(typeRef).getSort();
if (sort != TypeReference.INSTANCEOF
&& sort != TypeReference.NEW
&& sort != TypeReference.CONSTRUCTOR_REFERENCE
&& sort != TypeReference.METHOD_REFERENCE
&& sort != TypeReference.CAST
&& sort != TypeReference.CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT
&& sort != TypeReference.METHOD_INVOCATION_TYPE_ARGUMENT
&& sort != TypeReference.CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT
&& sort != TypeReference.METHOD_REFERENCE_TYPE_ARGUMENT) {
throw new IllegalArgumentException(INVALID_TYPE_REFERENCE + Integer.toHexString(sort));
}
CheckClassAdapter.checkTypeRef(typeRef);
CheckMethodAdapter.checkDescriptor(version, descriptor, false);
return new CheckAnnotationAdapter(
super.visitInsnAnnotation(typeRef, typePath, descriptor, visible));
}
@Override
public void visitTryCatchBlock(
final Label start, final Label end, final Label handler, final String type) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkLabel(start, false, START_LABEL);
checkLabel(end, false, END_LABEL);
checkLabel(handler, false, "handler label");
if (labelInsnIndices.get(start) != null
|| labelInsnIndices.get(end) != null
|| labelInsnIndices.get(handler) != null) {
throw new IllegalStateException("Try catch blocks must be visited before their labels");
}
if (type != null) {
checkInternalName(version, type, "type");
}
super.visitTryCatchBlock(start, end, handler, type);
handlers.add(start);
handlers.add(end);
}
@Override
public AnnotationVisitor visitTryCatchAnnotation(
final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
int sort = new TypeReference(typeRef).getSort();
if (sort != TypeReference.EXCEPTION_PARAMETER) {
throw new IllegalArgumentException(INVALID_TYPE_REFERENCE + Integer.toHexString(sort));
}
CheckClassAdapter.checkTypeRef(typeRef);
CheckMethodAdapter.checkDescriptor(version, descriptor, false);
return new CheckAnnotationAdapter(
super.visitTryCatchAnnotation(typeRef, typePath, descriptor, visible));
}
@Override
public void visitLocalVariable(
final String name,
final String descriptor,
final String signature,
final Label start,
final Label end,
final int index) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkUnqualifiedName(version, name, "name");
checkDescriptor(version, descriptor, false);
checkLabel(start, true, START_LABEL);
checkLabel(end, true, END_LABEL);
checkUnsignedShort(index, INVALID_LOCAL_VARIABLE_INDEX);
int startInsnIndex = labelInsnIndices.get(start).intValue();
int endInsnIndex = labelInsnIndices.get(end).intValue();
if (endInsnIndex < startInsnIndex) {
throw new IllegalArgumentException(
"Invalid start and end labels (end must be greater than start)");
}
super.visitLocalVariable(name, descriptor, signature, start, end, index);
}
@Override
public AnnotationVisitor visitLocalVariableAnnotation(
final int typeRef,
final TypePath typePath,
final Label[] start,
final Label[] end,
final int[] index,
final String descriptor,
final boolean visible) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
int sort = new TypeReference(typeRef).getSort();
if (sort != TypeReference.LOCAL_VARIABLE && sort != TypeReference.RESOURCE_VARIABLE) {
throw new IllegalArgumentException(INVALID_TYPE_REFERENCE + Integer.toHexString(sort));
}
CheckClassAdapter.checkTypeRef(typeRef);
checkDescriptor(version, descriptor, false);
if (start == null
|| end == null
|| index == null
|| end.length != start.length
|| index.length != start.length) {
throw new IllegalArgumentException(
"Invalid start, end and index arrays (must be non null and of identical length");
}
for (int i = 0; i < start.length; ++i) {
checkLabel(start[i], true, START_LABEL);
checkLabel(end[i], true, END_LABEL);
checkUnsignedShort(index[i], INVALID_LOCAL_VARIABLE_INDEX);
int startInsnIndex = labelInsnIndices.get(start[i]).intValue();
int endInsnIndex = labelInsnIndices.get(end[i]).intValue();
if (endInsnIndex < startInsnIndex) {
throw new IllegalArgumentException(
"Invalid start and end labels (end must be greater than start)");
}
}
return super.visitLocalVariableAnnotation(
typeRef, typePath, start, end, index, descriptor, visible);
}
@Override
public void visitLineNumber(final int line, final Label start) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
checkUnsignedShort(line, "Invalid line number");
checkLabel(start, true, START_LABEL);
super.visitLineNumber(line, start);
}
@Override
public void visitMaxs(final int maxStack, final int maxLocals) {
checkVisitCodeCalled();
checkVisitMaxsNotCalled();
visitMaxCalled = true;
for (Label l : referencedLabels) {
if (labelInsnIndices.get(l) == null) {
throw new IllegalStateException("Undefined label used");
}
}
for (int i = 0; i < handlers.size(); i += 2) {
Integer startInsnIndex = labelInsnIndices.get(handlers.get(i));
Integer endInsnIndex = labelInsnIndices.get(handlers.get(i + 1));
if (startInsnIndex == null || endInsnIndex == null) {
throw new IllegalStateException("Undefined try catch block labels");
}
if (endInsnIndex.intValue() <= startInsnIndex.intValue()) {
throw new IllegalStateException("Emty try catch block handler range");
}
}
checkUnsignedShort(maxStack, "Invalid max stack");
checkUnsignedShort(maxLocals, "Invalid max locals");
super.visitMaxs(maxStack, maxLocals);
}
@Override
public void visitEnd() {
checkVisitEndNotCalled();
visitEndCalled = true;
super.visitEnd();
}
// -----------------------------------------------------------------------------------------------
// Utility methods
// -----------------------------------------------------------------------------------------------
/** Checks that the {@link #visitCode} method has been called. */
private void checkVisitCodeCalled() {
if (!visitCodeCalled) {
throw new IllegalStateException(
"Cannot visit instructions before visitCode has been called.");
}
}
/** Checks that the {@link #visitMaxs} method has not been called. */
private void checkVisitMaxsNotCalled() {
if (visitMaxCalled) {
throw new IllegalStateException("Cannot visit instructions after visitMaxs has been called.");
}
}
/** Checks that the {@link #visitEnd} method has not been called. */
private void checkVisitEndNotCalled() {
if (visitEndCalled) {
throw new IllegalStateException("Cannot visit elements after visitEnd has been called.");
}
}
/**
* Checks a stack frame value.
*
* @param value the value to be checked.
*/
private void checkFrameValue(final Object value) {
if (value == Opcodes.TOP
|| value == Opcodes.INTEGER
|| value == Opcodes.FLOAT
|| value == Opcodes.LONG
|| value == Opcodes.DOUBLE
|| value == Opcodes.NULL
|| value == Opcodes.UNINITIALIZED_THIS) {
return;
} else if (value instanceof String) {
checkInternalName(version, (String) value, "Invalid stack frame value");
} else if (value instanceof Label) {
referencedLabels.add((Label) value);
} else {
throw new IllegalArgumentException("Invalid stack frame value: " + value);
}
}
/**
* Checks that the method to visit the given opcode is equal to the given method.
*
* @param opcode the opcode to be checked.
* @param method the expected visit method.
*/
private static void checkOpcodeMethod(final int opcode, final Method method) {
if (opcode < Opcodes.NOP || opcode > Opcodes.IFNONNULL || OPCODE_METHODS[opcode] != method) {
throw new IllegalArgumentException("Invalid opcode: " + opcode);
}
}
/**
* Checks that the given value is a signed byte.
*
* @param value the value to be checked.
* @param message the message to use in case of error.
*/
private static void checkSignedByte(final int value, final String message) {
if (value < Byte.MIN_VALUE || value > Byte.MAX_VALUE) {
throw new IllegalArgumentException(message + " (must be a signed byte): " + value);
}
}
/**
* Checks that the given value is a signed short.
*
* @param value the value to be checked.
* @param message the message to use in case of error.
*/
private static void checkSignedShort(final int value, final String message) {
if (value < Short.MIN_VALUE || value > Short.MAX_VALUE) {
throw new IllegalArgumentException(message + " (must be a signed short): " + value);
}
}
/**
* Checks that the given value is an unsigned short.
*
* @param value the value to be checked.
* @param message the message to use in case of error.
*/
private static void checkUnsignedShort(final int value, final String message) {
if (value < 0 || value > 65535) {
throw new IllegalArgumentException(message + " (must be an unsigned short): " + value);
}
}
/**
* Checks that the given value is an {@link Integer}, {@link Float}, {@link Long}, {@link Double}
* or {@link String} value.
*
* @param value the value to be checked.
*/
static void checkConstant(final Object value) {
if (!(value instanceof Integer)
&& !(value instanceof Float)
&& !(value instanceof Long)
&& !(value instanceof Double)
&& !(value instanceof String)) {
throw new IllegalArgumentException("Invalid constant: " + value);
}
}
/**
* Checks that the given value is a valid operand for the LDC instruction.
*
* @param value the value to be checked.
*/
private void checkLdcConstant(final Object value) {
if (value instanceof Type) {
int sort = ((Type) value).getSort();
if (sort != Type.OBJECT && sort != Type.ARRAY && sort != Type.METHOD) {
throw new IllegalArgumentException("Illegal LDC constant value");
}
if (sort != Type.METHOD && (version & 0xFFFF) < Opcodes.V1_5) {
throw new IllegalArgumentException("ldc of a constant class requires at least version 1.5");
}
if (sort == Type.METHOD && (version & 0xFFFF) < Opcodes.V1_7) {
throw new IllegalArgumentException("ldc of a method type requires at least version 1.7");
}
} else if (value instanceof Handle) {
if ((version & 0xFFFF) < Opcodes.V1_7) {
throw new IllegalArgumentException("ldc of a Handle requires at least version 1.7");
}
Handle handle = (Handle) value;
int tag = handle.getTag();
if (tag < Opcodes.H_GETFIELD || tag > Opcodes.H_INVOKEINTERFACE) {
throw new IllegalArgumentException("invalid handle tag " + tag);
}
checkInternalName(this.version, handle.getOwner(), "handle owner");
if (tag <= Opcodes.H_PUTSTATIC) {
checkDescriptor(this.version, handle.getDesc(), false);
} else {
checkMethodDescriptor(this.version, handle.getDesc());
}
String handleName = handle.getName();
if (!("".equals(handleName) && tag == Opcodes.H_NEWINVOKESPECIAL)) {
checkMethodIdentifier(this.version, handleName, "handle name");
}
} else if (value instanceof ConstantDynamic) {
if ((version & 0xFFFF) < Opcodes.V11) {
throw new IllegalArgumentException("ldc of a ConstantDynamic requires at least version 11");
}
ConstantDynamic constantDynamic = (ConstantDynamic) value;
checkMethodIdentifier(this.version, constantDynamic.getName(), "constant dynamic name");
checkDescriptor(this.version, constantDynamic.getDescriptor(), false);
checkLdcConstant(constantDynamic.getBootstrapMethod());
for (Object bootstrapArgument : constantDynamic.getBootstrapMethodArguments()) {
checkLdcConstant(bootstrapArgument);
}
} else {
checkConstant(value);
}
}
/**
* Checks that the given string is a valid unqualified name.
*
* @param version the class version.
* @param name the string to be checked.
* @param message the message to use in case of error.
*/
static void checkUnqualifiedName(final int version, final String name, final String message) {
checkIdentifier(version, name, 0, -1, message);
}
/**
* Checks that the given substring is a valid Java identifier.
*
* @param version the class version.
* @param name the string to be checked.
* @param startPos the index of the first character of the identifier (inclusive).
* @param endPos the index of the last character of the identifier (exclusive). -1 is equivalent
* to name.length() if name is not null .
* @param message the message to use in case of error.
*/
static void checkIdentifier(
final int version,
final String name,
final int startPos,
final int endPos,
final String message) {
if (name == null || (endPos == -1 ? name.length() <= startPos : endPos <= startPos)) {
throw new IllegalArgumentException(INVALID + message + MUST_NOT_BE_NULL_OR_EMPTY);
}
int max = endPos == -1 ? name.length() : endPos;
if ((version & 0xFFFF) >= Opcodes.V1_5) {
for (int i = startPos; i < max; i = name.offsetByCodePoints(i, 1)) {
if (".;[/".indexOf(name.codePointAt(i)) != -1) {
throw new IllegalArgumentException(
INVALID + message + " (must not contain . ; [ or /): " + name);
}
}
return;
}
for (int i = startPos; i < max; i = name.offsetByCodePoints(i, 1)) {
if (i == startPos
? !Character.isJavaIdentifierStart(name.codePointAt(i))
: !Character.isJavaIdentifierPart(name.codePointAt(i))) {
throw new IllegalArgumentException(
INVALID + message + " (must be a valid Java identifier): " + name);
}
}
}
/**
* Checks that the given string is a valid Java identifier.
*
* @param version the class version.
* @param name the string to be checked.
* @param message the message to use in case of error.
*/
static void checkMethodIdentifier(final int version, final String name, final String message) {
if (name == null || name.length() == 0) {
throw new IllegalArgumentException(INVALID + message + MUST_NOT_BE_NULL_OR_EMPTY);
}
if ((version & 0xFFFF) >= Opcodes.V1_5) {
for (int i = 0; i < name.length(); i = name.offsetByCodePoints(i, 1)) {
if (".;[/<>".indexOf(name.codePointAt(i)) != -1) {
throw new IllegalArgumentException(
INVALID + message + " (must be a valid unqualified name): " + name);
}
}
return;
}
for (int i = 0; i < name.length(); i = name.offsetByCodePoints(i, 1)) {
if (i == 0
? !Character.isJavaIdentifierStart(name.codePointAt(i))
: !Character.isJavaIdentifierPart(name.codePointAt(i))) {
throw new IllegalArgumentException(
INVALID
+ message
+ " (must be a '', '' or a valid Java identifier): "
+ name);
}
}
}
/**
* Checks that the given string is a valid internal class name or array type descriptor.
*
* @param version the class version.
* @param name the string to be checked.
* @param message the message to use in case of error.
*/
static void checkInternalName(final int version, final String name, final String message) {
if (name == null || name.length() == 0) {
throw new IllegalArgumentException(INVALID + message + MUST_NOT_BE_NULL_OR_EMPTY);
}
if (name.charAt(0) == '[') {
checkDescriptor(version, name, false);
} else {
checkInternalClassName(version, name, message);
}
}
/**
* Checks that the given string is a valid internal class name.
*
* @param version the class version.
* @param name the string to be checked.
* @param message the message to use in case of error.
*/
private static void checkInternalClassName(
final int version, final String name, final String message) {
try {
int startIndex = 0;
int slashIndex;
while ((slashIndex = name.indexOf('/', startIndex + 1)) != -1) {
CheckMethodAdapter.checkIdentifier(version, name, startIndex, slashIndex, null);
startIndex = slashIndex + 1;
}
CheckMethodAdapter.checkIdentifier(version, name, startIndex, name.length(), null);
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException(
INVALID + message + " (must be an internal class name): " + name);
}
}
/**
* Checks that the given string is a valid type descriptor.
*
* @param version the class version.
* @param descriptor the string to be checked.
* @param canBeVoid true if V can be considered valid.
*/
static void checkDescriptor(final int version, final String descriptor, final boolean canBeVoid) {
int endPos = checkDescriptor(version, descriptor, 0, canBeVoid);
if (endPos != descriptor.length()) {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
}
/**
* Checks that a the given substring is a valid type descriptor.
*
* @param version the class version.
* @param descriptor the string to be checked.
* @param startPos the index of the first character of the type descriptor (inclusive).
* @param canBeVoid whether V can be considered valid.
* @return the index of the last character of the type descriptor, plus one.
*/
private static int checkDescriptor(
final int version, final String descriptor, final int startPos, final boolean canBeVoid) {
if (descriptor == null || startPos >= descriptor.length()) {
throw new IllegalArgumentException("Invalid type descriptor (must not be null or empty)");
}
switch (descriptor.charAt(startPos)) {
case 'V':
if (canBeVoid) {
return startPos + 1;
} else {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
case 'Z':
case 'C':
case 'B':
case 'S':
case 'I':
case 'F':
case 'J':
case 'D':
return startPos + 1;
case '[':
int pos = startPos + 1;
while (pos < descriptor.length() && descriptor.charAt(pos) == '[') {
++pos;
}
if (pos < descriptor.length()) {
return checkDescriptor(version, descriptor, pos, false);
} else {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
case 'L':
int endPos = descriptor.indexOf(';', startPos);
if (startPos == -1 || endPos - startPos < 2) {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
try {
checkInternalClassName(version, descriptor.substring(startPos + 1, endPos), null);
} catch (IllegalArgumentException unused) {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
return endPos + 1;
default:
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
}
/**
* Checks that the given string is a valid method descriptor.
*
* @param version the class version.
* @param descriptor the string to be checked.
*/
static void checkMethodDescriptor(final int version, final String descriptor) {
if (descriptor == null || descriptor.length() == 0) {
throw new IllegalArgumentException("Invalid method descriptor (must not be null or empty)");
}
if (descriptor.charAt(0) != '(' || descriptor.length() < 3) {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
int pos = 1;
if (descriptor.charAt(pos) != ')') {
do {
if (descriptor.charAt(pos) == 'V') {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
pos = checkDescriptor(version, descriptor, pos, false);
} while (pos < descriptor.length() && descriptor.charAt(pos) != ')');
}
pos = checkDescriptor(version, descriptor, pos + 1, true);
if (pos != descriptor.length()) {
throw new IllegalArgumentException(INVALID_DESCRIPTOR + descriptor);
}
}
/**
* Checks that the given label is not null. This method can also check that the label has been
* visited.
*
* @param label the label to be checked.
* @param checkVisited whether to check that the label has been visited.
* @param message the message to use in case of error.
*/
private void checkLabel(final Label label, final boolean checkVisited, final String message) {
if (label == null) {
throw new IllegalArgumentException(INVALID + message + " (must not be null)");
}
if (checkVisited && labelInsnIndices.get(label) == null) {
throw new IllegalArgumentException(INVALID + message + " (must be visited first)");
}
}
}
