JDK14/Java14源码在线阅读
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classes /
com /
sun /
tools /
javac /
jvm /
ClassWriter.java
/*
* Copyright (c) 1999, 2019, 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.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.LinkedHashSet;
import java.util.function.ToIntFunction;
import javax.tools.JavaFileManager;
import javax.tools.FileObject;
import javax.tools.JavaFileManager.Location;
import javax.tools.JavaFileObject;
import com.sun.tools.javac.code.*;
import com.sun.tools.javac.code.Attribute.RetentionPolicy;
import com.sun.tools.javac.code.Directive.*;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.code.Type.*;
import com.sun.tools.javac.code.Types.SignatureGenerator.InvalidSignatureException;
import com.sun.tools.javac.comp.Check;
import com.sun.tools.javac.file.PathFileObject;
import com.sun.tools.javac.jvm.PoolConstant.LoadableConstant;
import com.sun.tools.javac.jvm.PoolConstant.Dynamic.BsmKey;
import com.sun.tools.javac.resources.CompilerProperties.Errors;
import com.sun.tools.javac.resources.CompilerProperties.Fragments;
import com.sun.tools.javac.util.*;
import com.sun.tools.javac.util.List;
import static com.sun.tools.javac.code.Flags.*;
import static com.sun.tools.javac.code.Kinds.Kind.*;
import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
import static com.sun.tools.javac.code.TypeTag.*;
import static com.sun.tools.javac.main.Option.*;
import static javax.tools.StandardLocation.CLASS_OUTPUT;
/** This class provides operations to map an internal symbol table graph
* rooted in a ClassSymbol into a classfile.
*
* <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 ClassWriter extends ClassFile {
protected static final Context.Key<ClassWriter> classWriterKey = new Context.Key<>();
private final Options options;
/** Switch: verbose output.
*/
private boolean verbose;
/** Switch: emit source file attribute.
*/
private boolean emitSourceFile;
/** Switch: generate CharacterRangeTable attribute.
*/
private boolean genCrt;
/** Switch: describe the generated stackmap.
*/
private boolean debugstackmap;
/** Preview language level.
*/
private Preview preview;
/**
* Target class version.
*/
private Target target;
/**
* Source language version.
*/
private Source source;
/** Type utilities. */
private Types types;
private Check check;
/**
* If true, class files will be written in module-specific subdirectories
* of the CLASS_OUTPUT location.
*/
public boolean multiModuleMode;
private List<ToIntFunction<Symbol>> extraAttributeHooks = List.nil();
/** The initial sizes of the data and constant pool buffers.
* Sizes are increased when buffers get full.
*/
static final int DATA_BUF_SIZE = 0x0fff0;
static final int CLASS_BUF_SIZE = 0x1fff0;
/** An output buffer for member info.
*/
public ByteBuffer databuf = new ByteBuffer(DATA_BUF_SIZE);
/** An output buffer for the constant pool.
*/
ByteBuffer poolbuf = new ByteBuffer(CLASS_BUF_SIZE);
/** The constant pool writer.
*/
final PoolWriter poolWriter;
/** The log to use for verbose output.
*/
private final Log log;
/** The name table. */
private final Names names;
/** Access to files. */
private final JavaFileManager fileManager;
/** The tags and constants used in compressed stackmap. */
static final int SAME_FRAME_SIZE = 64;
static final int SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247;
static final int SAME_FRAME_EXTENDED = 251;
static final int FULL_FRAME = 255;
static final int MAX_LOCAL_LENGTH_DIFF = 4;
/** Get the ClassWriter instance for this context. */
public static ClassWriter instance(Context context) {
ClassWriter instance = context.get(classWriterKey);
if (instance == null)
instance = new ClassWriter(context);
return instance;
}
/** Construct a class writer, given an options table.
*/
protected ClassWriter(Context context) {
context.put(classWriterKey, this);
log = Log.instance(context);
names = Names.instance(context);
options = Options.instance(context);
preview = Preview.instance(context);
target = Target.instance(context);
source = Source.instance(context);
types = Types.instance(context);
check = Check.instance(context);
fileManager = context.get(JavaFileManager.class);
poolWriter = Gen.instance(context).poolWriter;
verbose = options.isSet(VERBOSE);
genCrt = options.isSet(XJCOV);
debugstackmap = options.isSet("debug.stackmap");
emitSourceFile = options.isUnset(G_CUSTOM) ||
options.isSet(G_CUSTOM, "source");
String modifierFlags = options.get("debug.dumpmodifiers");
if (modifierFlags != null) {
dumpClassModifiers = modifierFlags.indexOf('c') != -1;
dumpFieldModifiers = modifierFlags.indexOf('f') != -1;
dumpInnerClassModifiers = modifierFlags.indexOf('i') != -1;
dumpMethodModifiers = modifierFlags.indexOf('m') != -1;
}
}
public void addExtraAttributes(ToIntFunction<Symbol> addExtraAttributes) {
extraAttributeHooks = extraAttributeHooks.prepend(addExtraAttributes);
}
/******************************************************************
* Diagnostics: dump generated class names and modifiers
******************************************************************/
/** Value of option 'dumpmodifiers' is a string
* indicating which modifiers should be dumped for debugging:
* 'c' -- classes
* 'f' -- fields
* 'i' -- innerclass attributes
* 'm' -- methods
* For example, to dump everything:
* javac -XDdumpmodifiers=cifm MyProg.java
*/
private boolean dumpClassModifiers; // -XDdumpmodifiers=c
private boolean dumpFieldModifiers; // -XDdumpmodifiers=f
private boolean dumpInnerClassModifiers; // -XDdumpmodifiers=i
private boolean dumpMethodModifiers; // -XDdumpmodifiers=m
/** Return flags as a string, separated by " ".
*/
public static String flagNames(long flags) {
StringBuilder sbuf = new StringBuilder();
int i = 0;
long f = flags & StandardFlags;
while (f != 0) {
if ((f & 1) != 0) {
sbuf.append(" ");
sbuf.append(flagName[i]);
}
f = f >> 1;
i++;
}
return sbuf.toString();
}
//where
private final static String[] flagName = {
"PUBLIC", "PRIVATE", "PROTECTED", "STATIC", "FINAL",
"SUPER", "VOLATILE", "TRANSIENT", "NATIVE", "INTERFACE",
"ABSTRACT", "STRICTFP"};
/******************************************************************
* Output routines
******************************************************************/
/** Write a character into given byte buffer;
* byte buffer will not be grown.
*/
void putChar(ByteBuffer buf, int op, int x) {
buf.elems[op ] = (byte)((x >> 8) & 0xFF);
buf.elems[op+1] = (byte)((x ) & 0xFF);
}
/** Write an integer into given byte buffer;
* byte buffer will not be grown.
*/
void putInt(ByteBuffer buf, int adr, int x) {
buf.elems[adr ] = (byte)((x >> 24) & 0xFF);
buf.elems[adr+1] = (byte)((x >> 16) & 0xFF);
buf.elems[adr+2] = (byte)((x >> 8) & 0xFF);
buf.elems[adr+3] = (byte)((x ) & 0xFF);
}
/******************************************************************
* Writing the Constant Pool
******************************************************************/
/** Thrown when the constant pool is over full.
*/
public static class PoolOverflow extends RuntimeException {
private static final long serialVersionUID = 0;
public PoolOverflow() {}
}
public static class StringOverflow extends RuntimeException {
private static final long serialVersionUID = 0;
public final String value;
public StringOverflow(String s) {
value = s;
}
}
/******************************************************************
* Writing Attributes
******************************************************************/
/** Write header for an attribute to data buffer and return
* position past attribute length index.
*/
public int writeAttr(Name attrName) {
int index = poolWriter.putName(attrName);
databuf.appendChar(index);
databuf.appendInt(0);
return databuf.length;
}
/** Fill in attribute length.
*/
public void endAttr(int index) {
putInt(databuf, index - 4, databuf.length - index);
}
/** Leave space for attribute count and return index for
* number of attributes field.
*/
int beginAttrs() {
databuf.appendChar(0);
return databuf.length;
}
/** Fill in number of attributes.
*/
void endAttrs(int index, int count) {
putChar(databuf, index - 2, count);
}
/** Write the EnclosingMethod attribute if needed.
* Returns the number of attributes written (0 or 1).
*/
int writeEnclosingMethodAttribute(ClassSymbol c) {
return writeEnclosingMethodAttribute(names.EnclosingMethod, c);
}
/** Write the EnclosingMethod attribute with a specified name.
* Returns the number of attributes written (0 or 1).
*/
protected int writeEnclosingMethodAttribute(Name attributeName, ClassSymbol c) {
if (c.owner.kind != MTH && // neither a local class
c.name != names.empty) // nor anonymous
return 0;
int alenIdx = writeAttr(attributeName);
ClassSymbol enclClass = c.owner.enclClass();
MethodSymbol enclMethod =
(c.owner.type == null // local to init block
|| c.owner.kind != MTH) // or member init
? null
: ((MethodSymbol)c.owner).originalEnclosingMethod();
databuf.appendChar(poolWriter.putClass(enclClass));
databuf.appendChar(enclMethod == null ? 0 : poolWriter.putNameAndType(enclMethod));
endAttr(alenIdx);
return 1;
}
/** Write flag attributes; return number of attributes written.
*/
int writeFlagAttrs(long flags) {
int acount = 0;
if ((flags & DEPRECATED) != 0) {
int alenIdx = writeAttr(names.Deprecated);
endAttr(alenIdx);
acount++;
}
return acount;
}
/** Write member (field or method) attributes;
* return number of attributes written.
*/
int writeMemberAttrs(Symbol sym, boolean isRecordComponent) {
int acount = 0;
if (!isRecordComponent) {
acount = writeFlagAttrs(sym.flags());
}
long flags = sym.flags();
if ((flags & (SYNTHETIC | BRIDGE)) != SYNTHETIC &&
(flags & ANONCONSTR) == 0 &&
(!types.isSameType(sym.type, sym.erasure(types)) ||
poolWriter.signatureGen.hasTypeVar(sym.type.getThrownTypes()))) {
// note that a local class with captured variables
// will get a signature attribute
int alenIdx = writeAttr(names.Signature);
databuf.appendChar(poolWriter.putSignature(sym));
endAttr(alenIdx);
acount++;
}
acount += writeJavaAnnotations(sym.getRawAttributes());
acount += writeTypeAnnotations(sym.getRawTypeAttributes(), false);
return acount;
}
/**
* Write method parameter names attribute.
*/
int writeMethodParametersAttr(MethodSymbol m) {
MethodType ty = m.externalType(types).asMethodType();
final int allparams = ty.argtypes.size();
if (m.params != null && allparams != 0) {
final int attrIndex = writeAttr(names.MethodParameters);
databuf.appendByte(allparams);
// Write extra parameters first
for (VarSymbol s : m.extraParams) {
final int flags =
((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
((int) m.flags() & SYNTHETIC);
databuf.appendChar(poolWriter.putName(s.name));
databuf.appendChar(flags);
}
// Now write the real parameters
for (VarSymbol s : m.params) {
final int flags =
((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
((int) m.flags() & SYNTHETIC);
databuf.appendChar(poolWriter.putName(s.name));
databuf.appendChar(flags);
}
// Now write the captured locals
for (VarSymbol s : m.capturedLocals) {
final int flags =
((int) s.flags() & (FINAL | SYNTHETIC | MANDATED)) |
((int) m.flags() & SYNTHETIC);
databuf.appendChar(poolWriter.putName(s.name));
databuf.appendChar(flags);
}
endAttr(attrIndex);
return 1;
} else
return 0;
}
private void writeParamAnnotations(List<VarSymbol> params,
RetentionPolicy retention) {
databuf.appendByte(params.length());
for (VarSymbol s : params) {
ListBuffer<Attribute.Compound> buf = new ListBuffer<>();
for (Attribute.Compound a : s.getRawAttributes())
if (types.getRetention(a) == retention)
buf.append(a);
databuf.appendChar(buf.length());
for (Attribute.Compound a : buf)
writeCompoundAttribute(a);
}
}
private void writeParamAnnotations(MethodSymbol m,
RetentionPolicy retention) {
databuf.appendByte(m.params.length());
writeParamAnnotations(m.params, retention);
}
/** Write method parameter annotations;
* return number of attributes written.
*/
int writeParameterAttrs(List<VarSymbol> vars) {
boolean hasVisible = false;
boolean hasInvisible = false;
if (vars != null) {
for (VarSymbol s : vars) {
for (Attribute.Compound a : s.getRawAttributes()) {
switch (types.getRetention(a)) {
case SOURCE: break;
case CLASS: hasInvisible = true; break;
case RUNTIME: hasVisible = true; break;
default: // /* fail soft */ throw new AssertionError(vis);
}
}
}
}
int attrCount = 0;
if (hasVisible) {
int attrIndex = writeAttr(names.RuntimeVisibleParameterAnnotations);
writeParamAnnotations(vars, RetentionPolicy.RUNTIME);
endAttr(attrIndex);
attrCount++;
}
if (hasInvisible) {
int attrIndex = writeAttr(names.RuntimeInvisibleParameterAnnotations);
writeParamAnnotations(vars, RetentionPolicy.CLASS);
endAttr(attrIndex);
attrCount++;
}
return attrCount;
}
/**********************************************************************
* Writing Java-language annotations (aka metadata, attributes)
**********************************************************************/
/** Write Java-language annotations; return number of JVM
* attributes written (zero or one).
*/
int writeJavaAnnotations(List<Attribute.Compound> attrs) {
if (attrs.isEmpty()) return 0;
ListBuffer<Attribute.Compound> visibles = new ListBuffer<>();
ListBuffer<Attribute.Compound> invisibles = new ListBuffer<>();
for (Attribute.Compound a : attrs) {
switch (types.getRetention(a)) {
case SOURCE: break;
case CLASS: invisibles.append(a); break;
case RUNTIME: visibles.append(a); break;
default: // /* fail soft */ throw new AssertionError(vis);
}
}
int attrCount = 0;
if (visibles.length() != 0) {
int attrIndex = writeAttr(names.RuntimeVisibleAnnotations);
databuf.appendChar(visibles.length());
for (Attribute.Compound a : visibles)
writeCompoundAttribute(a);
endAttr(attrIndex);
attrCount++;
}
if (invisibles.length() != 0) {
int attrIndex = writeAttr(names.RuntimeInvisibleAnnotations);
databuf.appendChar(invisibles.length());
for (Attribute.Compound a : invisibles)
writeCompoundAttribute(a);
endAttr(attrIndex);
attrCount++;
}
return attrCount;
}
int writeTypeAnnotations(List<Attribute.TypeCompound> typeAnnos, boolean inCode) {
if (typeAnnos.isEmpty()) return 0;
ListBuffer<Attribute.TypeCompound> visibles = new ListBuffer<>();
ListBuffer<Attribute.TypeCompound> invisibles = new ListBuffer<>();
for (Attribute.TypeCompound tc : typeAnnos) {
if (tc.hasUnknownPosition()) {
boolean fixed = tc.tryFixPosition();
// Could we fix it?
if (!fixed) {
// This happens for nested types like @A Outer. @B Inner.
// For method parameters we get the annotation twice! Once with
// a valid position, once unknown.
// TODO: find a cleaner solution.
PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
pw.println("ClassWriter: Position UNKNOWN in type annotation: " + tc);
continue;
}
}
if (tc.position.type.isLocal() != inCode)
continue;
if (!tc.position.emitToClassfile())
continue;
switch (types.getRetention(tc)) {
case SOURCE: break;
case CLASS: invisibles.append(tc); break;
case RUNTIME: visibles.append(tc); break;
default: // /* fail soft */ throw new AssertionError(vis);
}
}
int attrCount = 0;
if (visibles.length() != 0) {
int attrIndex = writeAttr(names.RuntimeVisibleTypeAnnotations);
databuf.appendChar(visibles.length());
for (Attribute.TypeCompound p : visibles)
writeTypeAnnotation(p);
endAttr(attrIndex);
attrCount++;
}
if (invisibles.length() != 0) {
int attrIndex = writeAttr(names.RuntimeInvisibleTypeAnnotations);
databuf.appendChar(invisibles.length());
for (Attribute.TypeCompound p : invisibles)
writeTypeAnnotation(p);
endAttr(attrIndex);
attrCount++;
}
return attrCount;
}
/** A visitor to write an attribute including its leading
* single-character marker.
*/
class AttributeWriter implements Attribute.Visitor {
public void visitConstant(Attribute.Constant _value) {
if (_value.type.getTag() == CLASS) {
Assert.check(_value.value instanceof String);
String s = (String)_value.value;
databuf.appendByte('s');
databuf.appendChar(poolWriter.putName(names.fromString(s)));
} else {
switch (_value.type.getTag()) {
case BYTE:
databuf.appendByte('B');
break;
case CHAR:
databuf.appendByte('C');
break;
case SHORT:
databuf.appendByte('S');
break;
case INT:
databuf.appendByte('I');
break;
case LONG:
databuf.appendByte('J');
break;
case FLOAT:
databuf.appendByte('F');
break;
case DOUBLE:
databuf.appendByte('D');
break;
case BOOLEAN:
databuf.appendByte('Z');
break;
default:
throw new AssertionError(_value.type);
}
databuf.appendChar(poolWriter.putConstant(_value.value));
}
}
public void visitEnum(Attribute.Enum e) {
databuf.appendByte('e');
databuf.appendChar(poolWriter.putDescriptor(e.value.type));
databuf.appendChar(poolWriter.putName(e.value.name));
}
public void visitClass(Attribute.Class clazz) {
databuf.appendByte('c');
databuf.appendChar(poolWriter.putDescriptor(clazz.classType));
}
public void visitCompound(Attribute.Compound compound) {
databuf.appendByte('@');
writeCompoundAttribute(compound);
}
public void visitError(Attribute.Error x) {
throw new AssertionError(x);
}
public void visitArray(Attribute.Array array) {
databuf.appendByte('[');
databuf.appendChar(array.values.length);
for (Attribute a : array.values) {
a.accept(this);
}
}
}
AttributeWriter awriter = new AttributeWriter();
/** Write a compound attribute excluding the '@' marker. */
void writeCompoundAttribute(Attribute.Compound c) {
databuf.appendChar(poolWriter.putDescriptor(c.type));
databuf.appendChar(c.values.length());
for (Pair<Symbol.MethodSymbol,Attribute> p : c.values) {
databuf.appendChar(poolWriter.putName(p.fst.name));
p.snd.accept(awriter);
}
}
void writeTypeAnnotation(Attribute.TypeCompound c) {
writePosition(c.position);
writeCompoundAttribute(c);
}
void writePosition(TypeAnnotationPosition p) {
databuf.appendByte(p.type.targetTypeValue()); // TargetType tag is a byte
switch (p.type) {
// instanceof
case INSTANCEOF:
// new expression
case NEW:
// constructor/method reference receiver
case CONSTRUCTOR_REFERENCE:
case METHOD_REFERENCE:
databuf.appendChar(p.offset);
break;
// local variable
case LOCAL_VARIABLE:
// resource variable
case RESOURCE_VARIABLE:
databuf.appendChar(p.lvarOffset.length); // for table length
for (int i = 0; i < p.lvarOffset.length; ++i) {
databuf.appendChar(p.lvarOffset[i]);
databuf.appendChar(p.lvarLength[i]);
databuf.appendChar(p.lvarIndex[i]);
}
break;
// exception parameter
case EXCEPTION_PARAMETER:
databuf.appendChar(p.getExceptionIndex());
break;
// method receiver
case METHOD_RECEIVER:
// Do nothing
break;
// type parameter
case CLASS_TYPE_PARAMETER:
case METHOD_TYPE_PARAMETER:
databuf.appendByte(p.parameter_index);
break;
// type parameter bound
case CLASS_TYPE_PARAMETER_BOUND:
case METHOD_TYPE_PARAMETER_BOUND:
databuf.appendByte(p.parameter_index);
databuf.appendByte(p.bound_index);
break;
// class extends or implements clause
case CLASS_EXTENDS:
databuf.appendChar(p.type_index);
break;
// throws
case THROWS:
databuf.appendChar(p.type_index);
break;
// method parameter
case METHOD_FORMAL_PARAMETER:
databuf.appendByte(p.parameter_index);
break;
// type cast
case CAST:
// method/constructor/reference type argument
case CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT:
case METHOD_INVOCATION_TYPE_ARGUMENT:
case CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT:
case METHOD_REFERENCE_TYPE_ARGUMENT:
databuf.appendChar(p.offset);
databuf.appendByte(p.type_index);
break;
// We don't need to worry about these
case METHOD_RETURN:
case FIELD:
break;
case UNKNOWN:
throw new AssertionError("jvm.ClassWriter: UNKNOWN target type should never occur!");
default:
throw new AssertionError("jvm.ClassWriter: Unknown target type for position: " + p);
}
{ // Append location data for generics/arrays.
databuf.appendByte(p.location.size());
java.util.List<Integer> loc = TypeAnnotationPosition.getBinaryFromTypePath(p.location);
for (int i : loc)
databuf.appendByte((byte)i);
}
}
/**********************************************************************
* Writing module attributes
**********************************************************************/
/** Write the Module attribute if needed.
* Returns the number of attributes written (0 or 1).
*/
int writeModuleAttribute(ClassSymbol c) {
ModuleSymbol m = (ModuleSymbol) c.owner;
int alenIdx = writeAttr(names.Module);
databuf.appendChar(poolWriter.putModule(m));
databuf.appendChar(ModuleFlags.value(m.flags)); // module_flags
databuf.appendChar(m.version != null ? poolWriter.putName(m.version) : 0);
ListBuffer<RequiresDirective> requires = new ListBuffer<>();
for (RequiresDirective r: m.requires) {
if (!r.flags.contains(RequiresFlag.EXTRA))
requires.add(r);
}
databuf.appendChar(requires.size());
for (RequiresDirective r: requires) {
databuf.appendChar(poolWriter.putModule(r.module));
databuf.appendChar(RequiresFlag.value(r.flags));
databuf.appendChar(r.module.version != null ? poolWriter.putName(r.module.version) : 0);
}
List<ExportsDirective> exports = m.exports;
databuf.appendChar(exports.size());
for (ExportsDirective e: exports) {
databuf.appendChar(poolWriter.putPackage(e.packge));
databuf.appendChar(ExportsFlag.value(e.flags));
if (e.modules == null) {
databuf.appendChar(0);
} else {
databuf.appendChar(e.modules.size());
for (ModuleSymbol msym: e.modules) {
databuf.appendChar(poolWriter.putModule(msym));
}
}
}
List<OpensDirective> opens = m.opens;
databuf.appendChar(opens.size());
for (OpensDirective o: opens) {
databuf.appendChar(poolWriter.putPackage(o.packge));
databuf.appendChar(OpensFlag.value(o.flags));
if (o.modules == null) {
databuf.appendChar(0);
} else {
databuf.appendChar(o.modules.size());
for (ModuleSymbol msym: o.modules) {
databuf.appendChar(poolWriter.putModule(msym));
}
}
}
List<UsesDirective> uses = m.uses;
databuf.appendChar(uses.size());
for (UsesDirective s: uses) {
databuf.appendChar(poolWriter.putClass(s.service));
}
// temporary fix to merge repeated provides clause for same service;
// eventually this should be disallowed when analyzing the module,
// so that each service type only appears once.
Map<ClassSymbol, Set<ClassSymbol>> mergedProvides = new LinkedHashMap<>();
for (ProvidesDirective p : m.provides) {
mergedProvides.computeIfAbsent(p.service, s -> new LinkedHashSet<>()).addAll(p.impls);
}
databuf.appendChar(mergedProvides.size());
mergedProvides.forEach((srvc, impls) -> {
databuf.appendChar(poolWriter.putClass(srvc));
databuf.appendChar(impls.size());
impls.forEach(impl -> databuf.appendChar(poolWriter.putClass(impl)));
});
endAttr(alenIdx);
return 1;
}
/**********************************************************************
* Writing Objects
**********************************************************************/
/** Write "inner classes" attribute.
*/
void writeInnerClasses() {
int alenIdx = writeAttr(names.InnerClasses);
databuf.appendChar(poolWriter.innerClasses.size());
for (ClassSymbol inner : poolWriter.innerClasses) {
inner.markAbstractIfNeeded(types);
char flags = (char) adjustFlags(inner.flags_field);
if ((flags & INTERFACE) != 0) flags |= ABSTRACT; // Interfaces are always ABSTRACT
flags &= ~STRICTFP; //inner classes should not have the strictfp flag set.
if (dumpInnerClassModifiers) {
PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
pw.println("INNERCLASS " + inner.name);
pw.println("---" + flagNames(flags));
}
databuf.appendChar(poolWriter.putClass(inner));
databuf.appendChar(
inner.owner.kind == TYP && !inner.name.isEmpty() ? poolWriter.putClass((ClassSymbol)inner.owner) : 0);
databuf.appendChar(
!inner.name.isEmpty() ? poolWriter.putName(inner.name) : 0);
databuf.appendChar(flags);
}
endAttr(alenIdx);
}
int writeRecordAttribute(ClassSymbol csym) {
int alenIdx = writeAttr(names.Record);
Scope s = csym.members();
databuf.appendChar(csym.getRecordComponents().size());
for (VarSymbol v: csym.getRecordComponents()) {
//databuf.appendChar(poolWriter.putMember(v.accessor.head.snd));
databuf.appendChar(poolWriter.putName(v.name));
databuf.appendChar(poolWriter.putDescriptor(v));
int acountIdx = beginAttrs();
int acount = 0;
acount += writeMemberAttrs(v, true);
endAttrs(acountIdx, acount);
}
endAttr(alenIdx);
return 1;
}
/**
* Write NestMembers attribute (if needed)
*/
int writeNestMembersIfNeeded(ClassSymbol csym) {
ListBuffer<ClassSymbol> nested = new ListBuffer<>();
listNested(csym, nested);
Set<ClassSymbol> nestedUnique = new LinkedHashSet<>(nested);
if (csym.owner.kind == PCK && !nestedUnique.isEmpty()) {
int alenIdx = writeAttr(names.NestMembers);
databuf.appendChar(nestedUnique.size());
for (ClassSymbol s : nestedUnique) {
databuf.appendChar(poolWriter.putClass(s));
}
endAttr(alenIdx);
return 1;
}
return 0;
}
/**
* Write NestHost attribute (if needed)
*/
int writeNestHostIfNeeded(ClassSymbol csym) {
if (csym.owner.kind != PCK) {
int alenIdx = writeAttr(names.NestHost);
databuf.appendChar(poolWriter.putClass(csym.outermostClass()));
endAttr(alenIdx);
return 1;
}
return 0;
}
private void listNested(Symbol sym, ListBuffer<ClassSymbol> seen) {
if (sym.kind != TYP) return;
ClassSymbol csym = (ClassSymbol)sym;
if (csym.owner.kind != PCK) {
seen.add(csym);
}
if (csym.members() != null) {
for (Symbol s : sym.members().getSymbols()) {
listNested(s, seen);
}
}
if (csym.trans_local != null) {
for (Symbol s : csym.trans_local) {
listNested(s, seen);
}
}
}
/** Write "bootstrapMethods" attribute.
*/
void writeBootstrapMethods() {
int alenIdx = writeAttr(names.BootstrapMethods);
databuf.appendChar(poolWriter.bootstrapMethods.size());
for (BsmKey bsmKey : poolWriter.bootstrapMethods.keySet()) {
//write BSM handle
databuf.appendChar(poolWriter.putConstant(bsmKey.bsm));
LoadableConstant[] uniqueArgs = bsmKey.staticArgs;
//write static args length
databuf.appendChar(uniqueArgs.length);
//write static args array
for (LoadableConstant arg : uniqueArgs) {
databuf.appendChar(poolWriter.putConstant(arg));
}
}
endAttr(alenIdx);
}
/** Write field symbol, entering all references into constant pool.
*/
void writeField(VarSymbol v) {
int flags = adjustFlags(v.flags());
databuf.appendChar(flags);
if (dumpFieldModifiers) {
PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
pw.println("FIELD " + v.name);
pw.println("---" + flagNames(v.flags()));
}
databuf.appendChar(poolWriter.putName(v.name));
databuf.appendChar(poolWriter.putDescriptor(v));
int acountIdx = beginAttrs();
int acount = 0;
if (v.getConstValue() != null) {
int alenIdx = writeAttr(names.ConstantValue);
databuf.appendChar(poolWriter.putConstant(v.getConstValue()));
endAttr(alenIdx);
acount++;
}
acount += writeMemberAttrs(v, false);
acount += writeExtraAttributes(v);
endAttrs(acountIdx, acount);
}
/** Write method symbol, entering all references into constant pool.
*/
void writeMethod(MethodSymbol m) {
int flags = adjustFlags(m.flags());
databuf.appendChar(flags);
if (dumpMethodModifiers) {
PrintWriter pw = log.getWriter(Log.WriterKind.ERROR);
pw.println("METHOD " + m.name);
pw.println("---" + flagNames(m.flags()));
}
databuf.appendChar(poolWriter.putName(m.name));
databuf.appendChar(poolWriter.putDescriptor(m));
int acountIdx = beginAttrs();
int acount = 0;
if (m.code != null) {
int alenIdx = writeAttr(names.Code);
writeCode(m.code);
m.code = null; // to conserve space
endAttr(alenIdx);
acount++;
}
List<Type> thrown = m.erasure(types).getThrownTypes();
if (thrown.nonEmpty()) {
int alenIdx = writeAttr(names.Exceptions);
databuf.appendChar(thrown.length());
for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
databuf.appendChar(poolWriter.putClass(l.head));
endAttr(alenIdx);
acount++;
}
if (m.defaultValue != null) {
int alenIdx = writeAttr(names.AnnotationDefault);
m.defaultValue.accept(awriter);
endAttr(alenIdx);
acount++;
}
if (target.hasMethodParameters() && (options.isSet(PARAMETERS) || m.isConstructor() && (m.flags_field & RECORD) != 0)) {
if (!m.isLambdaMethod()) // Per JDK-8138729, do not emit parameters table for lambda bodies.
acount += writeMethodParametersAttr(m);
}
acount += writeMemberAttrs(m, false);
if (!m.isLambdaMethod())
acount += writeParameterAttrs(m.params);
acount += writeExtraAttributes(m);
endAttrs(acountIdx, acount);
}
/** Write code attribute of method.
*/
void writeCode(Code code) {
databuf.appendChar(code.max_stack);
databuf.appendChar(code.max_locals);
databuf.appendInt(code.cp);
databuf.appendBytes(code.code, 0, code.cp);
databuf.appendChar(code.catchInfo.length());
for (List<char[]> l = code.catchInfo.toList();
l.nonEmpty();
l = l.tail) {
for (int i = 0; i < l.head.length; i++)
databuf.appendChar(l.head[i]);
}
int acountIdx = beginAttrs();
int acount = 0;
if (code.lineInfo.nonEmpty()) {
int alenIdx = writeAttr(names.LineNumberTable);
databuf.appendChar(code.lineInfo.length());
for (List<char[]> l = code.lineInfo.reverse();
l.nonEmpty();
l = l.tail)
for (int i = 0; i < l.head.length; i++)
databuf.appendChar(l.head[i]);
endAttr(alenIdx);
acount++;
}
if (genCrt && (code.crt != null)) {
CRTable crt = code.crt;
int alenIdx = writeAttr(names.CharacterRangeTable);
int crtIdx = beginAttrs();
int crtEntries = crt.writeCRT(databuf, code.lineMap, log);
endAttrs(crtIdx, crtEntries);
endAttr(alenIdx);
acount++;
}
// counter for number of generic local variables
if (code.varDebugInfo && code.varBufferSize > 0) {
int nGenericVars = 0;
int alenIdx = writeAttr(names.LocalVariableTable);
databuf.appendChar(code.getLVTSize());
for (int i=0; i<code.varBufferSize; i++) {
Code.LocalVar var = code.varBuffer[i];
for (Code.LocalVar.Range r: var.aliveRanges) {
// write variable info
Assert.check(r.start_pc >= 0
&& r.start_pc <= code.cp);
databuf.appendChar(r.start_pc);
Assert.check(r.length > 0
&& (r.start_pc + r.length) <= code.cp);
databuf.appendChar(r.length);
VarSymbol sym = var.sym;
databuf.appendChar(poolWriter.putName(sym.name));
databuf.appendChar(poolWriter.putDescriptor(sym));
databuf.appendChar(var.reg);
if (needsLocalVariableTypeEntry(var.sym.type)) {
nGenericVars++;
}
}
}
endAttr(alenIdx);
acount++;
if (nGenericVars > 0) {
alenIdx = writeAttr(names.LocalVariableTypeTable);
databuf.appendChar(nGenericVars);
int count = 0;
for (int i=0; i<code.varBufferSize; i++) {
Code.LocalVar var = code.varBuffer[i];
VarSymbol sym = var.sym;
if (!needsLocalVariableTypeEntry(sym.type))
continue;
for (Code.LocalVar.Range r : var.aliveRanges) {
// write variable info
databuf.appendChar(r.start_pc);
databuf.appendChar(r.length);
databuf.appendChar(poolWriter.putName(sym.name));
databuf.appendChar(poolWriter.putSignature(sym));
databuf.appendChar(var.reg);
count++;
}
}
Assert.check(count == nGenericVars);
endAttr(alenIdx);
acount++;
}
}
if (code.stackMapBufferSize > 0) {
if (debugstackmap) System.out.println("Stack map for " + code.meth);
int alenIdx = writeAttr(code.stackMap.getAttributeName(names));
writeStackMap(code);
endAttr(alenIdx);
acount++;
}
acount += writeTypeAnnotations(code.meth.getRawTypeAttributes(), true);
endAttrs(acountIdx, acount);
}
//where
private boolean needsLocalVariableTypeEntry(Type t) {
//a local variable needs a type-entry if its type T is generic
//(i.e. |T| != T) and if it's not an non-denotable type (non-denotable
// types are not supported in signature attribute grammar!)
return !types.isSameType(t, types.erasure(t)) &&
check.checkDenotable(t);
}
void writeStackMap(Code code) {
int nframes = code.stackMapBufferSize;
if (debugstackmap) System.out.println(" nframes = " + nframes);
databuf.appendChar(nframes);
switch (code.stackMap) {
case CLDC:
for (int i=0; i<nframes; i++) {
if (debugstackmap) System.out.print(" " + i + ":");
Code.StackMapFrame frame = code.stackMapBuffer[i];
// output PC
if (debugstackmap) System.out.print(" pc=" + frame.pc);
databuf.appendChar(frame.pc);
// output locals
int localCount = 0;
for (int j=0; j<frame.locals.length;
j += Code.width(frame.locals[j])) {
localCount++;
}
if (debugstackmap) System.out.print(" nlocals=" +
localCount);
databuf.appendChar(localCount);
for (int j=0; j<frame.locals.length;
j += Code.width(frame.locals[j])) {
if (debugstackmap) System.out.print(" local[" + j + "]=");
writeStackMapType(frame.locals[j]);
}
// output stack
int stackCount = 0;
for (int j=0; j<frame.stack.length;
j += Code.width(frame.stack[j])) {
stackCount++;
}
if (debugstackmap) System.out.print(" nstack=" +
stackCount);
databuf.appendChar(stackCount);
for (int j=0; j<frame.stack.length;
j += Code.width(frame.stack[j])) {
if (debugstackmap) System.out.print(" stack[" + j + "]=");
writeStackMapType(frame.stack[j]);
}
if (debugstackmap) System.out.println();
}
break;
case JSR202: {
Assert.checkNull(code.stackMapBuffer);
for (int i=0; i<nframes; i++) {
if (debugstackmap) System.out.print(" " + i + ":");
StackMapTableFrame frame = code.stackMapTableBuffer[i];
frame.write(this);
if (debugstackmap) System.out.println();
}
break;
}
default:
throw new AssertionError("Unexpected stackmap format value");
}
}
//where
void writeStackMapType(Type t) {
if (t == null) {
if (debugstackmap) System.out.print("empty");
databuf.appendByte(0);
}
else switch(t.getTag()) {
case BYTE:
case CHAR:
case SHORT:
case INT:
case BOOLEAN:
if (debugstackmap) System.out.print("int");
databuf.appendByte(1);
break;
case FLOAT:
if (debugstackmap) System.out.print("float");
databuf.appendByte(2);
break;
case DOUBLE:
if (debugstackmap) System.out.print("double");
databuf.appendByte(3);
break;
case LONG:
if (debugstackmap) System.out.print("long");
databuf.appendByte(4);
break;
case BOT: // null
if (debugstackmap) System.out.print("null");
databuf.appendByte(5);
break;
case CLASS:
case ARRAY:
case TYPEVAR:
if (debugstackmap) System.out.print("object(" + types.erasure(t).tsym + ")");
databuf.appendByte(7);
databuf.appendChar(poolWriter.putClass(types.erasure(t)));
break;
case UNINITIALIZED_THIS:
if (debugstackmap) System.out.print("uninit_this");
databuf.appendByte(6);
break;
case UNINITIALIZED_OBJECT:
{ UninitializedType uninitType = (UninitializedType)t;
databuf.appendByte(8);
if (debugstackmap) System.out.print("uninit_object@" + uninitType.offset);
databuf.appendChar(uninitType.offset);
}
break;
default:
throw new AssertionError();
}
}
/** An entry in the JSR202 StackMapTable */
abstract static class StackMapTableFrame {
abstract int getFrameType();
void write(ClassWriter writer) {
int frameType = getFrameType();
writer.databuf.appendByte(frameType);
if (writer.debugstackmap) System.out.print(" frame_type=" + frameType);
}
static class SameFrame extends StackMapTableFrame {
final int offsetDelta;
SameFrame(int offsetDelta) {
this.offsetDelta = offsetDelta;
}
int getFrameType() {
return (offsetDelta < SAME_FRAME_SIZE) ? offsetDelta : SAME_FRAME_EXTENDED;
}
@Override
void write(ClassWriter writer) {
super.write(writer);
if (getFrameType() == SAME_FRAME_EXTENDED) {
writer.databuf.appendChar(offsetDelta);
if (writer.debugstackmap){
System.out.print(" offset_delta=" + offsetDelta);
}
}
}
}
static class SameLocals1StackItemFrame extends StackMapTableFrame {
final int offsetDelta;
final Type stack;
SameLocals1StackItemFrame(int offsetDelta, Type stack) {
this.offsetDelta = offsetDelta;
this.stack = stack;
}
int getFrameType() {
return (offsetDelta < SAME_FRAME_SIZE) ?
(SAME_FRAME_SIZE + offsetDelta) :
SAME_LOCALS_1_STACK_ITEM_EXTENDED;
}
@Override
void write(ClassWriter writer) {
super.write(writer);
if (getFrameType() == SAME_LOCALS_1_STACK_ITEM_EXTENDED) {
writer.databuf.appendChar(offsetDelta);
if (writer.debugstackmap) {
System.out.print(" offset_delta=" + offsetDelta);
}
}
if (writer.debugstackmap) {
System.out.print(" stack[" + 0 + "]=");
}
writer.writeStackMapType(stack);
}
}
static class ChopFrame extends StackMapTableFrame {
final int frameType;
final int offsetDelta;
ChopFrame(int frameType, int offsetDelta) {
this.frameType = frameType;
this.offsetDelta = offsetDelta;
}
int getFrameType() { return frameType; }
@Override
void write(ClassWriter writer) {
super.write(writer);
writer.databuf.appendChar(offsetDelta);
if (writer.debugstackmap) {
System.out.print(" offset_delta=" + offsetDelta);
}
}
}
static class AppendFrame extends StackMapTableFrame {
final int frameType;
final int offsetDelta;
final Type[] locals;
AppendFrame(int frameType, int offsetDelta, Type[] locals) {
this.frameType = frameType;
this.offsetDelta = offsetDelta;
this.locals = locals;
}
int getFrameType() { return frameType; }
@Override
void write(ClassWriter writer) {
super.write(writer);
writer.databuf.appendChar(offsetDelta);
if (writer.debugstackmap) {
System.out.print(" offset_delta=" + offsetDelta);
}
for (int i=0; i<locals.length; i++) {
if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
writer.writeStackMapType(locals[i]);
}
}
}
static class FullFrame extends StackMapTableFrame {
final int offsetDelta;
final Type[] locals;
final Type[] stack;
FullFrame(int offsetDelta, Type[] locals, Type[] stack) {
this.offsetDelta = offsetDelta;
this.locals = locals;
this.stack = stack;
}
int getFrameType() { return FULL_FRAME; }
@Override
void write(ClassWriter writer) {
super.write(writer);
writer.databuf.appendChar(offsetDelta);
writer.databuf.appendChar(locals.length);
if (writer.debugstackmap) {
System.out.print(" offset_delta=" + offsetDelta);
System.out.print(" nlocals=" + locals.length);
}
for (int i=0; i<locals.length; i++) {
if (writer.debugstackmap) System.out.print(" locals[" + i + "]=");
writer.writeStackMapType(locals[i]);
}
writer.databuf.appendChar(stack.length);
if (writer.debugstackmap) { System.out.print(" nstack=" + stack.length); }
for (int i=0; i<stack.length; i++) {
if (writer.debugstackmap) System.out.print(" stack[" + i + "]=");
writer.writeStackMapType(stack[i]);
}
}
}
/** Compare this frame with the previous frame and produce
* an entry of compressed stack map frame. */
static StackMapTableFrame getInstance(Code.StackMapFrame this_frame,
int prev_pc,
Type[] prev_locals,
Types types) {
Type[] locals = this_frame.locals;
Type[] stack = this_frame.stack;
int offset_delta = this_frame.pc - prev_pc - 1;
if (stack.length == 1) {
if (locals.length == prev_locals.length
&& compare(prev_locals, locals, types) == 0) {
return new SameLocals1StackItemFrame(offset_delta, stack[0]);
}
} else if (stack.length == 0) {
int diff_length = compare(prev_locals, locals, types);
if (diff_length == 0) {
return new SameFrame(offset_delta);
} else if (-MAX_LOCAL_LENGTH_DIFF < diff_length && diff_length < 0) {
// APPEND
Type[] local_diff = new Type[-diff_length];
for (int i=prev_locals.length, j=0; i<locals.length; i++,j++) {
local_diff[j] = locals[i];
}
return new AppendFrame(SAME_FRAME_EXTENDED - diff_length,
offset_delta,
local_diff);
} else if (0 < diff_length && diff_length < MAX_LOCAL_LENGTH_DIFF) {
// CHOP
return new ChopFrame(SAME_FRAME_EXTENDED - diff_length,
offset_delta);
}
}
// FULL_FRAME
return new FullFrame(offset_delta, locals, stack);
}
static boolean isInt(Type t) {
return (t.getTag().isStrictSubRangeOf(INT) || t.hasTag(BOOLEAN));
}
static boolean isSameType(Type t1, Type t2, Types types) {
if (t1 == null) { return t2 == null; }
if (t2 == null) { return false; }
if (isInt(t1) && isInt(t2)) { return true; }
if (t1.hasTag(UNINITIALIZED_THIS)) {
return t2.hasTag(UNINITIALIZED_THIS);
} else if (t1.hasTag(UNINITIALIZED_OBJECT)) {
if (t2.hasTag(UNINITIALIZED_OBJECT)) {
return ((UninitializedType)t1).offset == ((UninitializedType)t2).offset;
} else {
return false;
}
} else if (t2.hasTag(UNINITIALIZED_THIS) || t2.hasTag(UNINITIALIZED_OBJECT)) {
return false;
}
return types.isSameType(t1, t2);
}
static int compare(Type[] arr1, Type[] arr2, Types types) {
int diff_length = arr1.length - arr2.length;
if (diff_length > MAX_LOCAL_LENGTH_DIFF || diff_length < -MAX_LOCAL_LENGTH_DIFF) {
return Integer.MAX_VALUE;
}
int len = (diff_length > 0) ? arr2.length : arr1.length;
for (int i=0; i<len; i++) {
if (!isSameType(arr1[i], arr2[i], types)) {
return Integer.MAX_VALUE;
}
}
return diff_length;
}
}
void writeFields(Scope s) {
// process them in reverse sibling order;
// i.e., process them in declaration order.
List<VarSymbol> vars = List.nil();
for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
if (sym.kind == VAR) vars = vars.prepend((VarSymbol)sym);
}
while (vars.nonEmpty()) {
writeField(vars.head);
vars = vars.tail;
}
}
void writeMethods(Scope s) {
List<MethodSymbol> methods = List.nil();
for (Symbol sym : s.getSymbols(NON_RECURSIVE)) {
if (sym.kind == MTH && (sym.flags() & HYPOTHETICAL) == 0)
methods = methods.prepend((MethodSymbol)sym);
}
while (methods.nonEmpty()) {
writeMethod(methods.head);
methods = methods.tail;
}
}
/** Emit a class file for a given class.
* @param c The class from which a class file is generated.
*/
public JavaFileObject writeClass(ClassSymbol c)
throws IOException, PoolOverflow, StringOverflow
{
String name = (c.owner.kind == MDL ? c.name : c.flatname).toString();
Location outLocn;
if (multiModuleMode) {
ModuleSymbol msym = c.owner.kind == MDL ? (ModuleSymbol) c.owner : c.packge().modle;
outLocn = fileManager.getLocationForModule(CLASS_OUTPUT, msym.name.toString());
} else {
outLocn = CLASS_OUTPUT;
}
JavaFileObject outFile
= fileManager.getJavaFileForOutput(outLocn,
name,
JavaFileObject.Kind.CLASS,
c.sourcefile);
OutputStream out = outFile.openOutputStream();
try {
writeClassFile(out, c);
if (verbose)
log.printVerbose("wrote.file", outFile.getName());
out.close();
out = null;
} catch (InvalidSignatureException ex) {
log.error(Errors.CannotGenerateClass(c, Fragments.IllegalSignature(c, ex.type())));
} finally {
if (out != null) {
// if we are propagating an exception, delete the file
out.close();
outFile.delete();
outFile = null;
}
}
return outFile; // may be null if write failed
}
/** Write class `c' to outstream `out'.
*/
public void writeClassFile(OutputStream out, ClassSymbol c)
throws IOException, PoolOverflow, StringOverflow {
Assert.check((c.flags() & COMPOUND) == 0);
databuf.reset();
poolbuf.reset();
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