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ClassReader.java
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ClassReader.java
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/*
* Copyright (c) 1999, 2021, 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 com.sun.tools.javac.jvm;
import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.CharBuffer;
import java.nio.file.ClosedFileSystemException;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.function.IntFunction;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.NestingKind;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import com.sun.tools.javac.code.Source.Feature;
import com.sun.tools.javac.comp.Annotate;
import com.sun.tools.javac.comp.Annotate.AnnotationTypeCompleter;
import com.sun.tools.javac.code.*;
import com.sun.tools.javac.code.Directive.*;
import com.sun.tools.javac.code.Lint.LintCategory;
import com.sun.tools.javac.code.Scope.WriteableScope;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.code.Symtab;
import com.sun.tools.javac.code.Type.*;
import com.sun.tools.javac.comp.Annotate.AnnotationTypeMetadata;
import com.sun.tools.javac.file.BaseFileManager;
import com.sun.tools.javac.file.PathFileObject;
import com.sun.tools.javac.jvm.ClassFile.Version;
import com.sun.tools.javac.jvm.PoolConstant.NameAndType;
import com.sun.tools.javac.main.Option;
import com.sun.tools.javac.resources.CompilerProperties.Fragments;
import com.sun.tools.javac.resources.CompilerProperties.Warnings;
import com.sun.tools.javac.util.*;
import com.sun.tools.javac.util.DefinedBy.Api;
import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
import static com.sun.tools.javac.code.Flags.*;
import static com.sun.tools.javac.code.Kinds.Kind.*;
import com.sun.tools.javac.code.Scope.LookupKind;
import static com.sun.tools.javac.code.TypeTag.ARRAY;
import static com.sun.tools.javac.code.TypeTag.CLASS;
import static com.sun.tools.javac.code.TypeTag.TYPEVAR;
import static com.sun.tools.javac.jvm.ClassFile.*;
import static com.sun.tools.javac.jvm.ClassFile.Version.*;
import static com.sun.tools.javac.main.Option.PARAMETERS;
/** This class provides operations to read a classfile into an internal
* representation. The internal representation is anchored in a
* ClassSymbol which contains in its scope symbol representations
* for all other definitions in the classfile. Top-level Classes themselves
* appear as members of the scopes of PackageSymbols.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class ClassReader {
/** The context key for the class reader. */
protected static final Context.Key<ClassReader> classReaderKey = new Context.Key<>();
public static final int INITIAL_BUFFER_SIZE = 0x0fff0;
private final Annotate annotate;
/** Switch: verbose output.
*/
boolean verbose;
/** Switch: allow modules.
*/
boolean allowModules;
/** Switch: allow sealed
*/
boolean allowSealedTypes;
/** Switch: allow records
*/
boolean allowRecords;
/** Lint option: warn about classfile issues
*/
boolean lintClassfile;
/** Switch: preserve parameter names from the variable table.
*/
public boolean saveParameterNames;
/**
* The currently selected profile.
*/
public final Profile profile;
/** The log to use for verbose output
*/
final Log log;
/** The symbol table. */
Symtab syms;
Types types;
/** The name table. */
final Names names;
/** Access to files
*/
private final JavaFileManager fileManager;
/** Factory for diagnostics
*/
JCDiagnostic.Factory diagFactory;
DeferredCompletionFailureHandler dcfh;
/**
* Support for preview language features.
*/
Preview preview;
/** The current scope where type variables are entered.
*/
protected WriteableScope typevars;
private List<InterimUsesDirective> interimUses = List.nil();
private List<InterimProvidesDirective> interimProvides = List.nil();
/** The path name of the class file currently being read.
*/
protected JavaFileObject currentClassFile = null;
/** The class or method currently being read.
*/
protected Symbol currentOwner = null;
/** The module containing the class currently being read.
*/
protected ModuleSymbol currentModule = null;
/** The buffer containing the currently read class file.
*/
ByteBuffer buf = new ByteBuffer(INITIAL_BUFFER_SIZE);
/** The current input pointer.
*/
protected int bp;
/** The pool reader.
*/
PoolReader poolReader;
/** The major version number of the class file being read. */
int majorVersion;
/** The minor version number of the class file being read. */
int minorVersion;
/** A table to hold the constant pool indices for method parameter
* names, as given in LocalVariableTable attributes.
*/
int[] parameterNameIndices;
/**
* A table to hold annotations for method parameters.
*/
ParameterAnnotations[] parameterAnnotations;
/**
* A holder for parameter annotations.
*/
static class ParameterAnnotations {
List<CompoundAnnotationProxy> proxies;
void add(List<CompoundAnnotationProxy> newAnnotations) {
if (proxies == null) {
proxies = newAnnotations;
} else {
proxies = proxies.prependList(newAnnotations);
}
}
}
/**
* Whether or not any parameter names have been found.
*/
boolean haveParameterNameIndices;
/** Set this to false every time we start reading a method
* and are saving parameter names. Set it to true when we see
* MethodParameters, if it's set when we see a LocalVariableTable,
* then we ignore the parameter names from the LVT.
*/
boolean sawMethodParameters;
/**
* The set of attribute names for which warnings have been generated for the current class
*/
Set<Name> warnedAttrs = new HashSet<>();
/**
* The prototype @Target Attribute.Compound if this class is an annotation annotated with
* @Target
*/
CompoundAnnotationProxy target;
/**
* The prototype @Repeatable Attribute.Compound if this class is an annotation annotated with
* @Repeatable
*/
CompoundAnnotationProxy repeatable;
/** Get the ClassReader instance for this invocation. */
public static ClassReader instance(Context context) {
ClassReader instance = context.get(classReaderKey);
if (instance == null)
instance = new ClassReader(context);
return instance;
}
/** Construct a new class reader. */
protected ClassReader(Context context) {
context.put(classReaderKey, this);
annotate = Annotate.instance(context);
names = Names.instance(context);
syms = Symtab.instance(context);
types = Types.instance(context);
fileManager = context.get(JavaFileManager.class);
if (fileManager == null)
throw new AssertionError("FileManager initialization error");
diagFactory = JCDiagnostic.Factory.instance(context);
dcfh = DeferredCompletionFailureHandler.instance(context);
log = Log.instance(context);
Options options = Options.instance(context);
verbose = options.isSet(Option.VERBOSE);
Source source = Source.instance(context);
preview = Preview.instance(context);
allowModules = Feature.MODULES.allowedInSource(source);
allowRecords = Feature.RECORDS.allowedInSource(source);
allowSealedTypes = (!preview.isPreview(Feature.SEALED_CLASSES) || preview.isEnabled()) &&
Feature.SEALED_CLASSES.allowedInSource(source);
saveParameterNames = options.isSet(PARAMETERS);
profile = Profile.instance(context);
typevars = WriteableScope.create(syms.noSymbol);
lintClassfile = Lint.instance(context).isEnabled(LintCategory.CLASSFILE);
initAttributeReaders();
}
/** Add member to class unless it is synthetic.
*/
private void enterMember(ClassSymbol c, Symbol sym) {
// Synthetic members are not entered -- reason lost to history (optimization?).
// Lambda methods must be entered because they may have inner classes (which reference them)
if ((sym.flags_field & (SYNTHETIC|BRIDGE)) != SYNTHETIC || sym.name.startsWith(names.lambda))
c.members_field.enter(sym);
}
/************************************************************************
* Error Diagnoses
***********************************************************************/
public ClassFinder.BadClassFile badClassFile(String key, Object... args) {
return new ClassFinder.BadClassFile (
currentOwner.enclClass(),
currentClassFile,
diagFactory.fragment(key, args),
diagFactory,
dcfh);
}
public ClassFinder.BadEnclosingMethodAttr badEnclosingMethod(Symbol sym) {
return new ClassFinder.BadEnclosingMethodAttr (
currentOwner.enclClass(),
currentClassFile,
diagFactory.fragment(Fragments.BadEnclosingMethod(sym)),
diagFactory,
dcfh);
}
/************************************************************************
* Buffer Access
***********************************************************************/
/** Read a character.
*/
char nextChar() {
char res = buf.getChar(bp);
bp += 2;
return res;
}
/** Read a byte.
*/
int nextByte() {
return buf.getByte(bp++) & 0xFF;
}
/** Read an integer.
*/
int nextInt() {
int res = buf.getInt(bp);
bp += 4;
return res;
}
/************************************************************************
* Constant Pool Access
***********************************************************************/
/** Read module_flags.
*/
Set<ModuleFlags> readModuleFlags(int flags) {
Set<ModuleFlags> set = EnumSet.noneOf(ModuleFlags.class);
for (ModuleFlags f : ModuleFlags.values()) {
if ((flags & f.value) != 0)
set.add(f);
}
return set;
}
/** Read resolution_flags.
*/
Set<ModuleResolutionFlags> readModuleResolutionFlags(int flags) {
Set<ModuleResolutionFlags> set = EnumSet.noneOf(ModuleResolutionFlags.class);
for (ModuleResolutionFlags f : ModuleResolutionFlags.values()) {
if ((flags & f.value) != 0)
set.add(f);
}
return set;
}
/** Read exports_flags.
*/
Set<ExportsFlag> readExportsFlags(int flags) {
Set<ExportsFlag> set = EnumSet.noneOf(ExportsFlag.class);
for (ExportsFlag f: ExportsFlag.values()) {
if ((flags & f.value) != 0)
set.add(f);
}
return set;
}
/** Read opens_flags.
*/
Set<OpensFlag> readOpensFlags(int flags) {
Set<OpensFlag> set = EnumSet.noneOf(OpensFlag.class);
for (OpensFlag f: OpensFlag.values()) {
if ((flags & f.value) != 0)
set.add(f);
}
return set;
}
/** Read requires_flags.
*/
Set<RequiresFlag> readRequiresFlags(int flags) {
Set<RequiresFlag> set = EnumSet.noneOf(RequiresFlag.class);
for (RequiresFlag f: RequiresFlag.values()) {
if ((flags & f.value) != 0)
set.add(f);
}
return set;
}
/************************************************************************
* Reading Types
***********************************************************************/
/** The unread portion of the currently read type is
* signature[sigp..siglimit-1].
*/
byte[] signature;
int sigp;
int siglimit;
boolean sigEnterPhase = false;
/** Convert signature to type, where signature is a byte array segment.
*/
Type sigToType(byte[] sig, int offset, int len) {
signature = sig;
sigp = offset;
siglimit = offset + len;
return sigToType();
}
/** Convert signature to type, where signature is implicit.
*/
Type sigToType() {
switch ((char) signature[sigp]) {
case 'T':
sigp++;
int start = sigp;
while (signature[sigp] != ';') sigp++;
sigp++;
return sigEnterPhase
? Type.noType
: findTypeVar(names.fromUtf(signature, start, sigp - 1 - start));
case '+': {
sigp++;
Type t = sigToType();
return new WildcardType(t, BoundKind.EXTENDS, syms.boundClass);
}
case '*':
sigp++;
return new WildcardType(syms.objectType, BoundKind.UNBOUND,
syms.boundClass);
case '-': {
sigp++;
Type t = sigToType();
return new WildcardType(t, BoundKind.SUPER, syms.boundClass);
}
case 'B':
sigp++;
return syms.byteType;
case 'C':
sigp++;
return syms.charType;
case 'D':
sigp++;
return syms.doubleType;
case 'F':
sigp++;
return syms.floatType;
case 'I':
sigp++;
return syms.intType;
case 'J':
sigp++;
return syms.longType;
case 'L':
{
// int oldsigp = sigp;
Type t = classSigToType();
if (sigp < siglimit && signature[sigp] == '.')
throw badClassFile("deprecated inner class signature syntax " +
"(please recompile from source)");
/*
System.err.println(" decoded " +
new String(signature, oldsigp, sigp-oldsigp) +
" => " + t + " outer " + t.outer());
*/
return t;
}
case 'S':
sigp++;
return syms.shortType;
case 'V':
sigp++;
return syms.voidType;
case 'Z':
sigp++;
return syms.booleanType;
case '[':
sigp++;
return new ArrayType(sigToType(), syms.arrayClass);
case '(':
sigp++;
List<Type> argtypes = sigToTypes(')');
Type restype = sigToType();
List<Type> thrown = List.nil();
while (sigp < siglimit && signature[sigp] == '^') {
sigp++;
thrown = thrown.prepend(sigToType());
}
// if there is a typevar in the throws clause we should state it.
for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) {
if (l.head.hasTag(TYPEVAR)) {
l.head.tsym.flags_field |= THROWS;
}
}
return new MethodType(argtypes,
restype,
thrown.reverse(),
syms.methodClass);
case '<':
typevars = typevars.dup(currentOwner);
Type poly = new ForAll(sigToTypeParams(), sigToType());
typevars = typevars.leave();
return poly;
default:
throw badClassFile("bad.signature",
Convert.utf2string(signature, sigp, 10));
}
}
byte[] signatureBuffer = new byte[0];
int sbp = 0;
/** Convert class signature to type, where signature is implicit.
*/
Type classSigToType() {
if (signature[sigp] != 'L')
throw badClassFile("bad.class.signature",
Convert.utf2string(signature, sigp, 10));
sigp++;
Type outer = Type.noType;
int startSbp = sbp;
while (true) {
final byte c = signature[sigp++];
switch (c) {
case ';': { // end
ClassSymbol t = enterClass(names.fromUtf(signatureBuffer,
startSbp,
sbp - startSbp));
try {
return (outer == Type.noType) ?
t.erasure(types) :
new ClassType(outer, List.nil(), t);
} finally {
sbp = startSbp;
}
}
case '<': // generic arguments
ClassSymbol t = enterClass(names.fromUtf(signatureBuffer,
startSbp,
sbp - startSbp));
outer = new ClassType(outer, sigToTypes('>'), t) {
boolean completed = false;
@Override @DefinedBy(Api.LANGUAGE_MODEL)
public Type getEnclosingType() {
if (!completed) {
completed = true;
tsym.complete();
Type enclosingType = tsym.type.getEnclosingType();
if (enclosingType != Type.noType) {
List<Type> typeArgs =
super.getEnclosingType().allparams();
List<Type> typeParams =
enclosingType.allparams();
if (typeParams.length() != typeArgs.length()) {
// no "rare" types
super.setEnclosingType(types.erasure(enclosingType));
} else {
super.setEnclosingType(types.subst(enclosingType,
typeParams,
typeArgs));
}
} else {
super.setEnclosingType(Type.noType);
}
}
return super.getEnclosingType();
}
@Override
public void setEnclosingType(Type outer) {
throw new UnsupportedOperationException();
}
};
switch (signature[sigp++]) {
case ';':
if (sigp < siglimit && signature[sigp] == '.') {
// support old-style GJC signatures
// The signature produced was
// Lfoo/Outer<Lfoo/X;>;.Lfoo/Outer$Inner<Lfoo/Y;>;
// rather than say
// Lfoo/Outer<Lfoo/X;>.Inner<Lfoo/Y;>;
// so we skip past ".Lfoo/Outer$"
sigp += (sbp - startSbp) + // "foo/Outer"
3; // ".L" and "$"
signatureBuffer[sbp++] = (byte)'$';
break;
} else {
sbp = startSbp;
return outer;
}
case '.':
signatureBuffer[sbp++] = (byte)'$';
break;
default:
throw new AssertionError(signature[sigp-1]);
}
continue;
case '.':
//we have seen an enclosing non-generic class
if (outer != Type.noType) {
t = enterClass(names.fromUtf(signatureBuffer,
startSbp,
sbp - startSbp));
outer = new ClassType(outer, List.nil(), t);
}
signatureBuffer[sbp++] = (byte)'$';
continue;
case '/':
signatureBuffer[sbp++] = (byte)'.';
continue;
default:
signatureBuffer[sbp++] = c;
continue;
}
}
}
/** Convert (implicit) signature to list of types
* until `terminator' is encountered.
*/
List<Type> sigToTypes(char terminator) {
List<Type> head = List.of(null);
List<Type> tail = head;
while (signature[sigp] != terminator)
tail = tail.setTail(List.of(sigToType()));
sigp++;
return head.tail;
}
/** Convert signature to type parameters, where signature is a byte
* array segment.
*/
List<Type> sigToTypeParams(byte[] sig, int offset, int len) {
signature = sig;
sigp = offset;
siglimit = offset + len;
return sigToTypeParams();
}
/** Convert signature to type parameters, where signature is implicit.
*/
List<Type> sigToTypeParams() {
List<Type> tvars = List.nil();
if (signature[sigp] == '<') {
sigp++;
int start = sigp;
sigEnterPhase = true;
while (signature[sigp] != '>')
tvars = tvars.prepend(sigToTypeParam());
sigEnterPhase = false;
sigp = start;
while (signature[sigp] != '>')
sigToTypeParam();
sigp++;
}
return tvars.reverse();
}
/** Convert (implicit) signature to type parameter.
*/
Type sigToTypeParam() {
int start = sigp;
while (signature[sigp] != ':') sigp++;
Name name = names.fromUtf(signature, start, sigp - start);
TypeVar tvar;
if (sigEnterPhase) {
tvar = new TypeVar(name, currentOwner, syms.botType);
typevars.enter(tvar.tsym);
} else {
tvar = (TypeVar)findTypeVar(name);
}
List<Type> bounds = List.nil();
boolean allInterfaces = false;
if (signature[sigp] == ':' && signature[sigp+1] == ':') {
sigp++;
allInterfaces = true;
}
while (signature[sigp] == ':') {
sigp++;
bounds = bounds.prepend(sigToType());
}
if (!sigEnterPhase) {
types.setBounds(tvar, bounds.reverse(), allInterfaces);
}
return tvar;
}
/** Find type variable with given name in `typevars' scope.
*/
Type findTypeVar(Name name) {
Symbol s = typevars.findFirst(name);
if (s != null) {
return s.type;
} else {
if (readingClassAttr) {
// While reading the class attribute, the supertypes
// might refer to a type variable from an enclosing element
// (method or class).
// If the type variable is defined in the enclosing class,
// we can actually find it in
// currentOwner.owner.type.getTypeArguments()
// However, until we have read the enclosing method attribute
// we don't know for sure if this owner is correct. It could
// be a method and there is no way to tell before reading the
// enclosing method attribute.
TypeVar t = new TypeVar(name, currentOwner, syms.botType);
missingTypeVariables = missingTypeVariables.prepend(t);
// System.err.println("Missing type var " + name);
return t;
}
throw badClassFile("undecl.type.var", name);
}
}
/************************************************************************
* Reading Attributes
***********************************************************************/
protected enum AttributeKind { CLASS, MEMBER }
protected abstract class AttributeReader {
protected AttributeReader(Name name, ClassFile.Version version, Set<AttributeKind> kinds) {
this.name = name;
this.version = version;
this.kinds = kinds;
}
protected boolean accepts(AttributeKind kind) {
if (kinds.contains(kind)) {
if (majorVersion > version.major || (majorVersion == version.major && minorVersion >= version.minor))
return true;
if (lintClassfile && !warnedAttrs.contains(name)) {
JavaFileObject prev = log.useSource(currentClassFile);
try {
log.warning(LintCategory.CLASSFILE, (DiagnosticPosition) null,
Warnings.FutureAttr(name, version.major, version.minor, majorVersion, minorVersion));
} finally {
log.useSource(prev);
}
warnedAttrs.add(name);
}
}
return false;
}
protected abstract void read(Symbol sym, int attrLen);
protected final Name name;
protected final ClassFile.Version version;
protected final Set<AttributeKind> kinds;
}
protected Set<AttributeKind> CLASS_ATTRIBUTE =
EnumSet.of(AttributeKind.CLASS);
protected Set<AttributeKind> MEMBER_ATTRIBUTE =
EnumSet.of(AttributeKind.MEMBER);
protected Set<AttributeKind> CLASS_OR_MEMBER_ATTRIBUTE =
EnumSet.of(AttributeKind.CLASS, AttributeKind.MEMBER);
protected Map<Name, AttributeReader> attributeReaders = new HashMap<>();
private void initAttributeReaders() {
AttributeReader[] readers = {
// v45.3 attributes
new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
if (saveParameterNames)
((MethodSymbol)sym).code = readCode(sym);
else
bp = bp + attrLen;
}
},
new AttributeReader(names.ConstantValue, V45_3, MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
Object v = poolReader.getConstant(nextChar());
// Ignore ConstantValue attribute if field not final.
if ((sym.flags() & FINAL) == 0) {
return;
}
VarSymbol var = (VarSymbol) sym;
switch (var.type.getTag()) {
case BOOLEAN:
case BYTE:
case CHAR:
case SHORT:
case INT:
checkType(var, Integer.class, v);
break;
case LONG:
checkType(var, Long.class, v);
break;
case FLOAT:
checkType(var, Float.class, v);
break;
case DOUBLE:
checkType(var, Double.class, v);
break;
case CLASS:
if (var.type.tsym == syms.stringType.tsym) {
checkType(var, String.class, v);
} else {
throw badClassFile("bad.constant.value.type", var.type);
}
break;
default:
// ignore ConstantValue attribute if type is not primitive or String
return;
}
if (v instanceof Integer && !var.type.getTag().checkRange((Integer) v)) {
throw badClassFile("bad.constant.range", v, var, var.type);
}
var.setData(v);
}
void checkType(Symbol var, Class<?> clazz, Object value) {
if (!clazz.isInstance(value)) {
throw badClassFile("bad.constant.value", value, var, clazz.getSimpleName());
}
}
},
new AttributeReader(names.Deprecated, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
Symbol s = sym.owner.kind == MDL ? sym.owner : sym;
s.flags_field |= DEPRECATED;
}
},
new AttributeReader(names.Exceptions, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
int nexceptions = nextChar();
List<Type> thrown = List.nil();
for (int j = 0; j < nexceptions; j++)
thrown = thrown.prepend(poolReader.getClass(nextChar()).type);
if (sym.type.getThrownTypes().isEmpty())
sym.type.asMethodType().thrown = thrown.reverse();
}
},
new AttributeReader(names.InnerClasses, V45_3, CLASS_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
ClassSymbol c = (ClassSymbol) sym;
if (currentModule.module_info == c) {
//prevent entering the classes too soon:
skipInnerClasses();
} else {
readInnerClasses(c);
}
}
},
new AttributeReader(names.LocalVariableTable, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
int newbp = bp + attrLen;
if (saveParameterNames && !sawMethodParameters) {
// Pick up parameter names from the variable table.
// Parameter names are not explicitly identified as such,
// but all parameter name entries in the LocalVariableTable
// have a start_pc of 0. Therefore, we record the name
// indices of all slots with a start_pc of zero in the
// parameterNameIndices array.
// Note that this implicitly honors the JVMS spec that
// there may be more than one LocalVariableTable, and that
// there is no specified ordering for the entries.
int numEntries = nextChar();
for (int i = 0; i < numEntries; i++) {
int start_pc = nextChar();
int length = nextChar();
int nameIndex = nextChar();
int sigIndex = nextChar();
int register = nextChar();
if (start_pc == 0) {
// ensure array large enough
if (register >= parameterNameIndices.length) {
int newSize =
Math.max(register + 1, parameterNameIndices.length + 8);
parameterNameIndices =
Arrays.copyOf(parameterNameIndices, newSize);
}
parameterNameIndices[register] = nameIndex;
haveParameterNameIndices = true;
}
}
}
bp = newbp;
}
},
new AttributeReader(names.SourceFile, V45_3, CLASS_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
ClassSymbol c = (ClassSymbol) sym;
Name n = poolReader.getName(nextChar());
c.sourcefile = new SourceFileObject(n);
// If the class is a toplevel class, originating from a Java source file,
// but the class name does not match the file name, then it is
// an auxiliary class.
String sn = n.toString();
if (c.owner.kind == PCK &&
sn.endsWith(".java") &&
!sn.equals(c.name.toString()+".java")) {
c.flags_field |= AUXILIARY;
}
}
},
new AttributeReader(names.Synthetic, V45_3, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
sym.flags_field |= SYNTHETIC;
}
},
// standard v49 attributes
new AttributeReader(names.EnclosingMethod, V49, CLASS_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
int newbp = bp + attrLen;
readEnclosingMethodAttr(sym);
bp = newbp;
}
},
new AttributeReader(names.Signature, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
if (sym.kind == TYP) {
ClassSymbol c = (ClassSymbol) sym;
readingClassAttr = true;
try {
ClassType ct1 = (ClassType)c.type;
Assert.check(c == currentOwner);
ct1.typarams_field = poolReader.getName(nextChar())
.map(ClassReader.this::sigToTypeParams);
ct1.supertype_field = sigToType();
ListBuffer<Type> is = new ListBuffer<>();
while (sigp != siglimit) is.append(sigToType());
ct1.interfaces_field = is.toList();
} finally {
readingClassAttr = false;
}
} else {
List<Type> thrown = sym.type.getThrownTypes();
sym.type = poolReader.getType(nextChar());
//- System.err.println(" # " + sym.type);
if (sym.kind == MTH && sym.type.getThrownTypes().isEmpty())
sym.type.asMethodType().thrown = thrown;
}
}
},
// v49 annotation attributes
new AttributeReader(names.AnnotationDefault, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
attachAnnotationDefault(sym);
}
},
new AttributeReader(names.RuntimeInvisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
attachAnnotations(sym);
}
},
new AttributeReader(names.RuntimeInvisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
readParameterAnnotations(sym);
}
},
new AttributeReader(names.RuntimeVisibleAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {
protected void read(Symbol sym, int attrLen) {
attachAnnotations(sym);
}
},
new AttributeReader(names.RuntimeVisibleParameterAnnotations, V49, CLASS_OR_MEMBER_ATTRIBUTE) {