/*
* @(#)Resolve.java 1.136 07/03/21
*
* Copyright (c) 2007 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package com.sun.tools.javac.comp;
import com.sun.tools.javac.util.*;
import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
import com.sun.tools.javac.code.*;
import com.sun.tools.javac.jvm.*;
import com.sun.tools.javac.tree.*;
import com.sun.tools.javac.code.Type.*;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.tree.JCTree.*;
import static com.sun.tools.javac.code.Flags.*;
import static com.sun.tools.javac.code.Kinds.*;
import static com.sun.tools.javac.code.TypeTags.*;
import javax.lang.model.element.ElementVisitor;
/** Helper class for name resolution, used mostly by the attribution phase.
*
* <p><b>This is NOT part of any API supported by Sun Microsystems. 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>
*/
@Version("@(#)Resolve.java 1.136 07/03/21")
public class Resolve {
private static my.Debug DEBUG=new my.Debug(my.Debug.Resolve);//我加上的
protected static final Context.Key<Resolve> resolveKey =
new Context.Key<Resolve>();
Name.Table names;
Log log;
Symtab syms;
Check chk;
Infer infer;
ClassReader reader;
TreeInfo treeinfo;
Types types;
public final boolean boxingEnabled; // = source.allowBoxing();
public final boolean varargsEnabled; // = source.allowVarargs();
private final boolean debugResolve;
public static Resolve instance(Context context) {
Resolve instance = context.get(resolveKey);
if (instance == null)
instance = new Resolve(context);
return instance;
}
protected Resolve(Context context) {
DEBUG.P(this,"Resolve(1)");
context.put(resolveKey, this);
syms = Symtab.instance(context);
varNotFound = new
ResolveError(ABSENT_VAR, syms.errSymbol, "variable not found");
wrongMethod = new
ResolveError(WRONG_MTH, syms.errSymbol, "method not found");
wrongMethods = new
ResolveError(WRONG_MTHS, syms.errSymbol, "wrong methods");
methodNotFound = new
ResolveError(ABSENT_MTH, syms.errSymbol, "method not found");
typeNotFound = new
ResolveError(ABSENT_TYP, syms.errSymbol, "type not found");
names = Name.Table.instance(context);
log = Log.instance(context);
chk = Check.instance(context);
infer = Infer.instance(context);
reader = ClassReader.instance(context);
treeinfo = TreeInfo.instance(context);
types = Types.instance(context);
Source source = Source.instance(context);
boxingEnabled = source.allowBoxing();
varargsEnabled = source.allowVarargs();
Options options = Options.instance(context);
debugResolve = options.get("debugresolve") != null;
DEBUG.P(0,this,"Resolve(1)");
}
/** error symbols, which are returned when resolution fails
*/
final ResolveError varNotFound;
final ResolveError wrongMethod;
final ResolveError wrongMethods;
final ResolveError methodNotFound;
final ResolveError typeNotFound;
/* ************************************************************************
* Identifier resolution
*************************************************************************/
/** An environment is "static" if its static level is greater than
* the one of its outer environment
*/
static boolean isStatic(Env<AttrContext> env) {
return env.info.staticLevel > env.outer.info.staticLevel;
}
/** An environment is an "initializer" if it is a constructor or
* an instance initializer.
*/
static boolean isInitializer(Env<AttrContext> env) {
try {//我加上的
DEBUG.P(Resolve.class,"isInitializer(Env<AttrContext> env)");
DEBUG.P("env="+env);
Symbol owner = env.info.scope.owner;
DEBUG.P("owner="+owner);
DEBUG.P("owner.isConstructor()="+owner.isConstructor());
if(!owner.isConstructor()) {
DEBUG.P("owner.owner="+owner.owner);
DEBUG.P("owner.owner.kind="+Kinds.toString(owner.owner.kind));
DEBUG.P("owner.kind="+Kinds.toString(owner.kind));
DEBUG.P("owner.flags()="+Flags.toString(owner.flags()));
}
return owner.isConstructor() ||
owner.owner.kind == TYP &&
(owner.kind == VAR ||
owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
(owner.flags() & STATIC) == 0;
}finally{
DEBUG.P(0,Resolve.class,"isInitializer(Env<AttrContext> env)");
}
}
/** Is class accessible in given evironment?
* @param env The current environment.
* @param c The class whose accessibility is checked.
*/
//在env这样一个环境中是否有权限访问TypeSymbol c
public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
/*
switch ((short)(c.flags() & AccessFlags)) {
case PRIVATE:
return
env.enclClass.sym.outermostClass() ==
c.owner.outermostClass();
case 0:
return
env.toplevel.packge == c.owner // fast special case
||
env.toplevel.packge == c.packge()
||
// Hack: this case is added since synthesized default constructors
// of anonymous classes should be allowed to access
// classes which would be inaccessible otherwise.
env.enclMethod != null &&
(env.enclMethod.mods.flags & ANONCONSTR) != 0;
default: // error recovery
case PUBLIC:
return true;
case PROTECTED:
return
env.toplevel.packge == c.owner // fast special case
||
env.toplevel.packge == c.packge()
||
isInnerSubClass(env.enclClass.sym, c.owner);
}
*/
boolean isAccessible=true;//我加上的
try {//我加上的
//DEBUG.ON();
DEBUG.P(this,"isAccessible(2)");
/*
DEBUG.P("env="+env);
DEBUG.P("c="+c);
DEBUG.P("c.flags()="+Flags.toString(c.flags()));
DEBUG.P("c.flags() & AccessFlags="+Flags.toString(c.flags() & AccessFlags));
DEBUG.P("env.enclClass.sym.name="+env.enclClass.sym.name);
DEBUG.P("env.enclClass.sym.outermostClass()="+env.enclClass.sym.outermostClass());
DEBUG.P("c.owner.name="+c.owner.name);
DEBUG.P("c.owner.outermostClass()="+c.owner.outermostClass());
*/
//AccessFlags = PUBLIC | PROTECTED | PRIVATE在Flags类中定义
switch ((short)(c.flags() & AccessFlags)) {
case PRIVATE:
return isAccessible=
env.enclClass.sym.outermostClass() ==
c.owner.outermostClass();
case 0:
return isAccessible=
env.toplevel.packge == c.owner // fast special case
||
env.toplevel.packge == c.packge()
||
// Hack: this case is added since synthesized default constructors
// of anonymous classes should be allowed to access
// classes which would be inaccessible otherwise.
env.enclMethod != null &&
(env.enclMethod.mods.flags & ANONCONSTR) != 0;
default: // error recovery
case PUBLIC:
return true;
case PROTECTED:
return isAccessible=
env.toplevel.packge == c.owner // fast special case
||
env.toplevel.packge == c.packge()
||
isInnerSubClass(env.enclClass.sym, c.owner);
}
}finally{//我加上的
DEBUG.P("c="+c+" flag="+Flags.toString(c.flags()));
DEBUG.P("isAccessible="+isAccessible);
DEBUG.P(0,this,"isAccessible(2)");
//DEBUG.OFF();
}
}
//where
/** Is given class a subclass of given base class, or an inner class
* of a subclass?
* Return null if no such class exists.
* @param c The class which is the subclass or is contained in it.
* @param base The base class
*/
private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
while (c != null && !c.isSubClass(base, types)) {
c = c.owner.enclClass();
}
return c != null;
}
boolean isAccessible(Env<AttrContext> env, Type t) {
return (t.tag == ARRAY)
? isAccessible(env, types.elemtype(t))
: isAccessible(env, t.tsym);
}
/** Is symbol accessible as a member of given type in given evironment?
* @param env The current environment.
* @param site The type of which the tested symbol is regarded
* as a member.
* @param sym The symbol.
*/
//假定Symbol sym是Type site的成员(member),判断
//在env这样一个环境中是否有权限访问Symbol sym
public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
boolean isAccessible=true;//我加上的
try {//我加上的
DEBUG.P(this,"isAccessible(3)");
DEBUG.P("env="+env);
DEBUG.P("site="+site);
DEBUG.P("sym.name="+sym.name);
DEBUG.P("sym.flags_field="+Flags.toString(sym.flags_field));
DEBUG.P("sym.flags_field & AccessFlags="+Flags.toString(sym.flags_field & AccessFlags));
if (sym.name == names.init && sym.owner != site.tsym) return isAccessible=false;
ClassSymbol sub;
switch ((short)(sym.flags() & AccessFlags)) {
case PRIVATE:
return isAccessible=
(env.enclClass.sym == sym.owner // fast special case
||
env.enclClass.sym.outermostClass() ==
sym.owner.outermostClass())
&&
sym.isInheritedIn(site.tsym, types);
case 0:
DEBUG.P("");DEBUG.P("case 0");
DEBUG.P("env.toplevel.packge="+env.toplevel.packge);
DEBUG.P("sym.owner.owner ="+sym.owner.owner);
DEBUG.P("sym.packge() ="+sym.packge());
return isAccessible=//sym.owner.owner当sym是顶层类的类型变量时 如ClassA<T,V extends T>，sym=T
(env.toplevel.packge == sym.owner.owner // fast special case
||
env.toplevel.packge == sym.packge())
&&
isAccessible(env, site)
&&
sym.isInheritedIn(site.tsym, types);
case PROTECTED:
return isAccessible=
(env.toplevel.packge == sym.owner.owner // fast special case
||
env.toplevel.packge == sym.packge()
||
isProtectedAccessible(sym, env.enclClass.sym, site)
||
// OK to select instance method or field from 'super' or type name
// (but type names should be disallowed elsewhere!)
env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
&&
isAccessible(env, site)
&&
// `sym' is accessible only if not overridden by
// another symbol which is a member of `site'
// (because, if it is overridden, `sym' is not strictly
// speaking a member of `site'.)
(sym.kind != MTH || sym.isConstructor() ||
((MethodSymbol)sym).implementation(site.tsym, types, true) == sym);
default: // this case includes erroneous combinations as well
return isAccessible=isAccessible(env, site);
}
}finally{//我加上的
DEBUG.P("sym="+sym+" flag="+Flags.toString(sym.flags()));
DEBUG.P("site="+site);
DEBUG.P("isAccessible="+isAccessible);
DEBUG.P(0,this,"isAccessible(3)");
}
}
//where
/** Is given protected symbol accessible if it is selected from given site
* and the selection takes place in given class?
* @param sym The symbol with protected access
* @param c The class where the access takes place
* @site The type of the qualifier
*/
private
boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
while (c != null &&
!(c.isSubClass(sym.owner, types) &&
(c.flags() & INTERFACE) == 0 &&
// In JLS 2e 6.6.2.1, the subclass restriction applies
// only to instance fields and methods -- types are excluded
// regardless of whether they are declared 'static' or not.
((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
c = c.owner.enclClass();
return c != null;
}
/** Try to instantiate the type of a method so that it fits
* given type arguments and argument types. If succesful, return
* the method's instantiated type, else return null.
* The instantiation will take into account an additional leading
* formal parameter if the method is an instance method seen as a member
* of un underdetermined site In this case, we treat site as an additional
* parameter and the parameters of the class containing the method as
* additional type variables that get instantiated.
*
* @param env The current environment
* @param site The type of which the method is a member.
* @param m The method symbol.
* @param argtypes The invocation's given value arguments.
* @param typeargtypes The invocation's given type arguments.
* @param allowBoxing Allow boxing conversions of arguments.
* @param useVarargs Box trailing arguments into an array for varargs.
*/
Type rawInstantiate(Env<AttrContext> env,
Type site,
Symbol m,
List<Type> argtypes,
List<Type> typeargtypes,
boolean allowBoxing,
boolean useVarargs,
Warner warn)
throws Infer.NoInstanceException {
try {//我加上的
DEBUG.P(this,"rawInstantiate(8)");
DEBUG.P("site="+site);
DEBUG.P("m="+m);
DEBUG.P("m.flags()="+Flags.toString(m.flags()));
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
if (useVarargs && (m.flags() & VARARGS) == 0) return null;
Type mt = types.memberType(site, m);
DEBUG.P("mt="+mt);
DEBUG.P("mt.tag="+TypeTags.toString(mt.tag));
// tvars is the list of formal type variables for which type arguments
// need to inferred.
List<Type> tvars = env.info.tvars;
DEBUG.P("tvars="+tvars);
if (typeargtypes == null) typeargtypes = List.nil();
if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
//在定义一个方法时没有指定类型变量，但是在调用此方法时
//如果加上类型参数也是合法的
DEBUG.P("This is not a polymorphic method");
// This is not a polymorphic method, but typeargs are supplied
// which is fine, see JLS3 15.12.2.1
} else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
ForAll pmt = (ForAll) mt;
if (typeargtypes.length() != pmt.tvars.length())
return null;
// Check type arguments are within bounds
List<Type> formals = pmt.tvars;
List<Type> actuals = typeargtypes;
DEBUG.P("formals="+formals);
DEBUG.P("actuals="+actuals);
while (formals.nonEmpty() && actuals.nonEmpty()) {
List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
pmt.tvars, typeargtypes);
for (; bounds.nonEmpty(); bounds = bounds.tail)
if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
return null;
formals = formals.tail;
actuals = actuals.tail;
}
mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
} else if (mt.tag == FORALL) {
DEBUG.P("(mt.tag == FORALL)");
ForAll pmt = (ForAll) mt;
List<Type> tvars1 = types.newInstances(pmt.tvars);
DEBUG.P("tvars1="+tvars1);
tvars = tvars.appendList(tvars1);
DEBUG.P("tvars="+tvars);
mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
DEBUG.P("mt="+mt);
}
// find out whether we need to go the slow route via infer
boolean instNeeded = tvars.tail != null/*inlined: tvars.nonEmpty()*/;
DEBUG.P("instNeeded="+instNeeded);
DEBUG.P("argtypes="+argtypes);
for (List<Type> l = argtypes;
l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
l = l.tail) {
if (l.head.tag == FORALL) instNeeded = true;
}
DEBUG.P("instNeeded="+instNeeded);
if (instNeeded)
return
infer.instantiateMethod(tvars,
(MethodType)mt,
argtypes,
allowBoxing,
useVarargs,
warn);
return
argumentsAcceptable(argtypes, mt.getParameterTypes(),
allowBoxing, useVarargs, warn)
? mt
: null;
}finally{//我加上的
DEBUG.P(0,this,"rawInstantiate(8)");
}
}
/** Same but returns null instead throwing a NoInstanceException
*/
Type instantiate(Env<AttrContext> env,
Type site,
Symbol m,
List<Type> argtypes,
List<Type> typeargtypes,
boolean allowBoxing,
boolean useVarargs,
Warner warn) {
try {//我加上的
DEBUG.P(this,"instantiate(8)");
try {
return rawInstantiate(env, site, m, argtypes, typeargtypes,
allowBoxing, useVarargs, warn);
} catch (Infer.NoInstanceException ex) {
return null;
}
}finally{//我加上的
DEBUG.P(0,this,"instantiate(8)");
}
}
/** Check if a parameter list accepts a list of args.
*/
boolean argumentsAcceptable(List<Type> argtypes,
List<Type> formals,
boolean allowBoxing,
boolean useVarargs,
Warner warn) {
boolean argumentsAcceptable=false;//我加上的
try {//我加上的
DEBUG.P(this,"argumentsAcceptable(5)");
DEBUG.P("argtypes="+argtypes);
DEBUG.P("formals="+formals);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
Type varargsFormal = useVarargs ? formals.last() : null;
while (argtypes.nonEmpty() && formals.head != varargsFormal) {
boolean works = allowBoxing
? types.isConvertible(argtypes.head, formals.head, warn)
: types.isSubtypeUnchecked(argtypes.head, formals.head, warn);
DEBUG.P("works="+works);
if (!works) return false;
argtypes = argtypes.tail;
formals = formals.tail;
}
DEBUG.P("formals.head="+formals.head);
DEBUG.P("varargsFormal="+varargsFormal);
if (formals.head != varargsFormal) return false; // not enough args
if (!useVarargs)
//return argtypes.isEmpty();
return argumentsAcceptable=argtypes.isEmpty();
Type elt = types.elemtype(varargsFormal);
while (argtypes.nonEmpty()) {
if (!types.isConvertible(argtypes.head, elt, warn))
return false;
argtypes = argtypes.tail;
}
//return true;
return argumentsAcceptable=true;
}finally{//我加上的
DEBUG.P("argumentsAcceptable="+argumentsAcceptable);
DEBUG.P(0,this,"argumentsAcceptable(5)");
}
}
/* ***************************************************************************
* Symbol lookup
* the following naming conventions for arguments are used
*
* env is the environment where the symbol was mentioned
* site is the type of which the symbol is a member
* name is the symbol's name
* if no arguments are given
* argtypes are the value arguments, if we search for a method
*
* If no symbol was found, a ResolveError detailing the problem is returned.
****************************************************************************/
/** Find field. Synthetic fields are always skipped.
* @param env The current environment.
* @param site The original type from where the selection takes place.
* @param name The name of the field.
* @param c The class to search for the field. This is always
* a superclass or implemented interface of site's class.
*/
Symbol findField(Env<AttrContext> env,
Type site,
Name name,
TypeSymbol c) {
try {//我加上的
DEBUG.P(this,"findField(4)");
DEBUG.P("site="+site);
DEBUG.P("name="+name);
DEBUG.P("c="+c);
DEBUG.P("c.members()="+c.members());
Symbol bestSoFar = varNotFound;
Symbol sym;
Scope.Entry e = c.members().lookup(name);
while (e.scope != null) {
if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
return isAccessible(env, site, e.sym)
? e.sym : new AccessError(env, site, e.sym);
}
e = e.next();
}
Type st = types.supertype(c.type);
if (st != null && st.tag == CLASS) {
sym = findField(env, site, name, st.tsym);
if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
for (List<Type> l = types.interfaces(c.type);
bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
l = l.tail) {
sym = findField(env, site, name, l.head.tsym);
if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
sym.owner != bestSoFar.owner)
bestSoFar = new AmbiguityError(bestSoFar, sym);
else if (sym.kind < bestSoFar.kind)
bestSoFar = sym;
}
return bestSoFar;
}finally{//我加上的
DEBUG.P(0,this,"findField(4)");
}
}
/** Resolve a field identifier, throw a fatal error if not found.
* @param pos The position to use for error reporting.
* @param env The environment current at the method invocation.
* @param site The type of the qualifying expression, in which
* identifier is searched.
* @param name The identifier's name.
*/
public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
Type site, Name name) {
Symbol sym = findField(env, site, name, site.tsym);
if (sym.kind == VAR) return (VarSymbol)sym;
else throw new FatalError(
JCDiagnostic.fragment("fatal.err.cant.locate.field",
name));
}
/** Find unqualified variable or field with given name.
* Synthetic fields always skipped.
* @param env The current environment.
* @param name The name of the variable or field.
*/
Symbol findVar(Env<AttrContext> env, Name name) {
try {
DEBUG.P(this,"findVar(2)");
DEBUG.P("env="+env);
DEBUG.P("name="+name);
Symbol bestSoFar = varNotFound;
Symbol sym;
Env<AttrContext> env1 = env;
boolean staticOnly = false;
while (env1.outer != null) {
if (isStatic(env1)) staticOnly = true;
Scope.Entry e = env1.info.scope.lookup(name);
DEBUG.P("staticOnly="+staticOnly);
DEBUG.P("e.scope="+e.scope);
while (e.scope != null &&
(e.sym.kind != VAR ||
(e.sym.flags_field & SYNTHETIC) != 0))
e = e.next();
sym = (e.scope != null)
? e.sym
: findField(
env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
DEBUG.P("sym.exists()="+sym.exists());
DEBUG.P("sym.flags() ="+Flags.toString(sym.flags()));
if (sym.exists()) {
if (staticOnly &&
sym.kind == VAR &&
sym.owner.kind == TYP &&
(sym.flags() & STATIC) == 0)
return new StaticError(sym);
else
return sym;
} else if (sym.kind < bestSoFar.kind) {
bestSoFar = sym;
}
/*
class VisitSelectTest {
int a1;
//env1.enclClass.sym.flags() & STATIC) != 0)==TRUE
static class C1_1 {
int a2=a1; //无法从静态上下文中引用非静态 变量 a1
class C1_1_1 {
//static int a2=a1; //内部类不能有静态声明
int a2=a1; //无法从静态上下文中引用非静态 变量 a1
}
}
}
*/
if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
env1 = env1.outer;
DEBUG.P("staticOnly="+staticOnly);
}
sym = findField(env, syms.predefClass.type, name, syms.predefClass);
DEBUG.P("sym.exists()="+sym.exists());
if (sym.exists())
return sym;
DEBUG.P("bestSoFar.exists()="+bestSoFar.exists());
if (bestSoFar.exists())
return bestSoFar;
Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
DEBUG.P("e.scope="+e.scope);
for (; e.scope != null; e = e.next()) {
sym = e.sym;
Type origin = e.getOrigin().owner.type;
if (sym.kind == VAR) {
if (e.sym.owner.type != origin)
sym = sym.clone(e.getOrigin().owner);
return isAccessible(env, origin, sym)
? sym : new AccessError(env, origin, sym);
}
}
Symbol origin = null;
e = env.toplevel.starImportScope.lookup(name);
DEBUG.P("e.scope="+e.scope);
for (; e.scope != null; e = e.next()) {
sym = e.sym;
if (sym.kind != VAR)
continue;
// invariant: sym.kind == VAR
if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
return new AmbiguityError(bestSoFar, sym);
else if (bestSoFar.kind >= VAR) {
origin = e.getOrigin().owner;
bestSoFar = isAccessible(env, origin.type, sym)
? sym : new AccessError(env, origin.type, sym);
}
}
if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
return bestSoFar.clone(origin);
else
return bestSoFar;
}finally{
DEBUG.P(0,this,"findVar(2)");
}
}
Warner noteWarner = new Warner();
/** Select the best method for a call site among two choices.
* @param env The current environment.
* @param site The original type from where the
* selection takes place.
* @param argtypes The invocation's value arguments,
* @param typeargtypes The invocation's type arguments,
* @param sym Proposed new best match.
* @param bestSoFar Previously found best match.
* @param allowBoxing Allow boxing conversions of arguments.
* @param useVarargs Box trailing arguments into an array for varargs.
*/
Symbol selectBest(Env<AttrContext> env,
Type site,
List<Type> argtypes,
List<Type> typeargtypes,
Symbol sym,
Symbol bestSoFar,
boolean allowBoxing,
boolean useVarargs,
boolean operator) {
try {//我加上的
DEBUG.P(this,"selectBest(9)");
DEBUG.P("env="+env);
DEBUG.P("site="+site);
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
DEBUG.P("sym="+sym);
DEBUG.P("bestSoFar="+bestSoFar);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
DEBUG.P("operator="+operator);
DEBUG.P("sym.kind="+Kinds.toString(sym.kind));
if (sym.kind == ERR) return bestSoFar;
if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
DEBUG.P("sym.kind="+Kinds.toString(sym.kind));
assert sym.kind < AMBIGUOUS;
try {
if (rawInstantiate(env, site, sym, argtypes, typeargtypes,
allowBoxing, useVarargs, Warner.noWarnings) == null) {
// inapplicable
DEBUG.P("bestSoFar.kind="+Kinds.toString(bestSoFar.kind));
switch (bestSoFar.kind) {
case ABSENT_MTH: return wrongMethod.setWrongSym(sym);
case WRONG_MTH: return wrongMethods;
default: return bestSoFar;
}
}
} catch (Infer.NoInstanceException ex) {
switch (bestSoFar.kind) {
case ABSENT_MTH:
return wrongMethod.setWrongSym(sym, ex.getDiagnostic());
case WRONG_MTH:
return wrongMethods;
default:
return bestSoFar;
}
}
if (!isAccessible(env, site, sym)) {
return (bestSoFar.kind == ABSENT_MTH)
? new AccessError(env, site, sym)
: bestSoFar;
}
DEBUG.P("bestSoFar.kind="+Kinds.toString(bestSoFar.kind));
return (bestSoFar.kind > AMBIGUOUS)
? sym
: mostSpecific(sym, bestSoFar, env, site,
allowBoxing && operator, useVarargs);
}finally{//我加上的
DEBUG.P(0,this,"selectBest(9)");
}
}
/* Return the most specific of the two methods for a call,
* given that both are accessible and applicable.
* @param m1 A new candidate for most specific.
* @param m2 The previous most specific candidate.
* @param env The current environment.
* @param site The original type from where the selection
* takes place.
* @param allowBoxing Allow boxing conversions of arguments.
* @param useVarargs Box trailing arguments into an array for varargs.
*/
Symbol mostSpecific(Symbol m1,
Symbol m2,
Env<AttrContext> env,
Type site,
boolean allowBoxing,
boolean useVarargs) {
try {//我加上的
DEBUG.P(this,"mostSpecific(6)");
DEBUG.P("m1="+m1);
DEBUG.P("m2="+m2);
DEBUG.P("site="+site);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
DEBUG.P("m2.kind="+Kinds.toString(m2.kind));
switch (m2.kind) {
case MTH:
if (m1 == m2) return m1;
Type mt1 = types.memberType(site, m1);
noteWarner.unchecked = false;
boolean m1SignatureMoreSpecific =
(instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
allowBoxing, false, noteWarner) != null ||
useVarargs && instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
allowBoxing, true, noteWarner) != null) &&
!noteWarner.unchecked;
Type mt2 = types.memberType(site, m2);
noteWarner.unchecked = false;
boolean m2SignatureMoreSpecific =
(instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
allowBoxing, false, noteWarner) != null ||
useVarargs && instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
allowBoxing, true, noteWarner) != null) &&
!noteWarner.unchecked;
if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
if (!types.overrideEquivalent(mt1, mt2))
return new AmbiguityError(m1, m2);
// same signature; select (a) the non-bridge method, or
// (b) the one that overrides the other, or (c) the concrete
// one, or (d) merge both abstract signatures
if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE)) {
return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
}
// if one overrides or hides the other, use it
TypeSymbol m1Owner = (TypeSymbol)m1.owner;
TypeSymbol m2Owner = (TypeSymbol)m2.owner;
if (types.asSuper(m1Owner.type, m2Owner) != null &&
((m1.owner.flags_field & INTERFACE) == 0 ||
(m2.owner.flags_field & INTERFACE) != 0) &&
m1.overrides(m2, m1Owner, types, false))
return m1;
if (types.asSuper(m2Owner.type, m1Owner) != null &&
((m2.owner.flags_field & INTERFACE) == 0 ||
(m1.owner.flags_field & INTERFACE) != 0) &&
m2.overrides(m1, m2Owner, types, false))
return m2;
boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
if (m1Abstract && !m2Abstract) return m2;
if (m2Abstract && !m1Abstract) return m1;
// both abstract or both concrete
if (!m1Abstract && !m2Abstract)
return new AmbiguityError(m1, m2);
// check for same erasure
if (!types.isSameType(m1.erasure(types), m2.erasure(types)))
return new AmbiguityError(m1, m2);
// both abstract, neither overridden; merge throws clause and result type
Symbol result;
Type result2 = mt2.getReturnType();;
if (mt2.tag == FORALL)
result2 = types.subst(result2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars);
if (types.isSubtype(mt1.getReturnType(), result2)) {
result = m1;
} else if (types.isSubtype(result2, mt1.getReturnType())) {
result = m2;
} else {
// Theoretically, this can't happen, but it is possible
// due to error recovery or mixing incompatible class files
return new AmbiguityError(m1, m2);
}
result = result.clone(result.owner);
result.type = (Type)result.type.clone();
result.type.setThrown(chk.intersect(mt1.getThrownTypes(),
mt2.getThrownTypes()));
return result;
}
if (m1SignatureMoreSpecific) return m1;
if (m2SignatureMoreSpecific) return m2;
return new AmbiguityError(m1, m2);
case AMBIGUOUS:
AmbiguityError e = (AmbiguityError)m2;
Symbol err1 = mostSpecific(m1, e.sym1, env, site, allowBoxing, useVarargs);
Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
if (err1 == err2) return err1;
if (err1 == e.sym1 && err2 == e.sym2) return m2;
if (err1 instanceof AmbiguityError &&
err2 instanceof AmbiguityError &&
((AmbiguityError)err1).sym1 == ((AmbiguityError)err2).sym1)
return new AmbiguityError(m1, m2);
else
return new AmbiguityError(err1, err2);
default:
throw new AssertionError();
}
}finally{//我加上的
DEBUG.P(0,this,"mostSpecific(6)");
}
}
/** Find best qualified method matching given name, type and value
* arguments.
* @param env The current environment.
* @param site The original type from where the selection
* takes place.
* @param name The method's name.
* @param argtypes The method's value arguments.
* @param typeargtypes The method's type arguments
* @param allowBoxing Allow boxing conversions of arguments.
* @param useVarargs Box trailing arguments into an array for varargs.
*/
Symbol findMethod(Env<AttrContext> env,
Type site,
Name name,
List<Type> argtypes,
List<Type> typeargtypes,
boolean allowBoxing,
boolean useVarargs,
boolean operator) {
return findMethod(env,
site,
name,
argtypes,
typeargtypes,
site.tsym.type,
true,
methodNotFound,
allowBoxing,
useVarargs,
operator);
}
// where
private Symbol findMethod(Env<AttrContext> env,
Type site,
Name name,
List<Type> argtypes,
List<Type> typeargtypes,
Type intype,
boolean abstractok,
Symbol bestSoFar,
boolean allowBoxing,
boolean useVarargs,
boolean operator) {
DEBUG.P(this,"findMethod(11)");
DEBUG.P("env="+env);
DEBUG.P("site="+site); //site是不含类型变量(typeAppyy)的类型
DEBUG.P("name="+name);
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
DEBUG.P("intype="+intype); //intype是含原始类型变量的类型
DEBUG.P("abstractok="+abstractok);
DEBUG.P("bestSoFar="+bestSoFar);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
DEBUG.P("operator="+operator);
DEBUG.P(2);
for (Type ct = intype; ct.tag == CLASS; ct = types.supertype(ct)) {
ClassSymbol c = (ClassSymbol)ct.tsym;
DEBUG.P("c="+c);
DEBUG.P("c.flags()="+Flags.toString(c.flags()));
DEBUG.P("c.members()="+c.members());
if ((c.flags() & (ABSTRACT | INTERFACE)) == 0)
abstractok = false;
for (Scope.Entry e = c.members().lookup(name);
e.scope != null;
e = e.next()) {
//- System.out.println(" e " + e.sym);
if (e.sym.kind == MTH &&
(e.sym.flags_field & SYNTHETIC) == 0) {
bestSoFar = selectBest(env, site, argtypes, typeargtypes,
e.sym, bestSoFar,
allowBoxing,
useVarargs,
operator);
}
}
//如果在一个非抽象类中找不到指定的方法，
//那么在这个类所有实现的接口同样找不到，
//所以上面的if ((c.flags() & (ABSTRACT | INTERFACE)) == 0)
//把abstractok设成了false之后，下面的部分就不再执行了
DEBUG.P("abstractok="+abstractok);
//- System.out.println(" - " + bestSoFar);
if (abstractok) {
Symbol concrete = methodNotFound;
if ((bestSoFar.flags() & ABSTRACT) == 0)
concrete = bestSoFar;
for (List<Type> l = types.interfaces(c.type);
l.nonEmpty();
l = l.tail) {
bestSoFar = findMethod(env, site, name, argtypes,
typeargtypes,
l.head, abstractok, bestSoFar,
allowBoxing, useVarargs, operator);
}
if (concrete != bestSoFar &&
concrete.kind < ERR && bestSoFar.kind < ERR &&
types.isSubSignature(concrete.type, bestSoFar.type))
bestSoFar = concrete;
}
}
DEBUG.P("bestSoFar="+bestSoFar);
DEBUG.P(0,this,"findMethod(11)");
return bestSoFar;
}
/** Find unqualified method matching given name, type and value arguments.
* @param env The current environment.
* @param name The method's name.
* @param argtypes The method's value arguments.
* @param typeargtypes The method's type arguments.
* @param allowBoxing Allow boxing conversions of arguments.
* @param useVarargs Box trailing arguments into an array for varargs.
*/
Symbol findFun(Env<AttrContext> env, Name name,
List<Type> argtypes, List<Type> typeargtypes,
boolean allowBoxing, boolean useVarargs) {
try {
DEBUG.P(this,"findFun(6)");
DEBUG.P("env="+env);
DEBUG.P("name="+name);
//DEBUG.P("argtypes="+argtypes);
//DEBUG.P("typeargtypes="+typeargtypes);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
Symbol bestSoFar = methodNotFound;
Symbol sym;
Env<AttrContext> env1 = env;
boolean staticOnly = false;
while (env1.outer != null) {
if (isStatic(env1)) staticOnly = true;
sym = findMethod(
env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
allowBoxing, useVarargs, false);
if (sym.exists()) {
if (staticOnly &&
sym.kind == MTH &&
sym.owner.kind == TYP &&
(sym.flags() & STATIC) == 0) return new StaticError(sym);
else return sym;
} else if (sym.kind < bestSoFar.kind) {
bestSoFar = sym;
}
if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
env1 = env1.outer;
}
sym = findMethod(env, syms.predefClass.type, name, argtypes,
typeargtypes, allowBoxing, useVarargs, false);
if (sym.exists())
return sym;
Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
for (; e.scope != null; e = e.next()) {
sym = e.sym;
Type origin = e.getOrigin().owner.type;
if (sym.kind == MTH) {
if (e.sym.owner.type != origin)
sym = sym.clone(e.getOrigin().owner);
if (!isAccessible(env, origin, sym))
sym = new AccessError(env, origin, sym);
bestSoFar = selectBest(env, origin,
argtypes, typeargtypes,
sym, bestSoFar,
allowBoxing, useVarargs, false);
}
}
if (bestSoFar.exists())
return bestSoFar;
e = env.toplevel.starImportScope.lookup(name);
for (; e.scope != null; e = e.next()) {
sym = e.sym;
Type origin = e.getOrigin().owner.type;
if (sym.kind == MTH) {
if (e.sym.owner.type != origin)
sym = sym.clone(e.getOrigin().owner);
if (!isAccessible(env, origin, sym))
sym = new AccessError(env, origin, sym);
bestSoFar = selectBest(env, origin,
argtypes, typeargtypes,
sym, bestSoFar,
allowBoxing, useVarargs, false);
}
}
return bestSoFar;
}finally{
DEBUG.P(0,this,"findFun(6)");
}
}
/** Load toplevel or member class with given fully qualified name and
* verify that it is accessible.
* @param env The current environment.
* @param name The fully qualified name of the class to be loaded.
*/
Symbol loadClass(Env<AttrContext> env, Name name) {
try {
DEBUG.P(this,"loadClass(Env<AttrContext> env, Name name)");
DEBUG.P("env="+env);
DEBUG.P("name="+name);
ClassSymbol c = reader.loadClass(name);
DEBUG.P("ClassSymbol c="+c);
return isAccessible(env, c) ? c : new AccessError(c);
} catch (ClassReader.BadClassFile err) {
DEBUG.P("ClassReader.BadClassFile="+err);
throw err;
} catch (CompletionFailure ex) {
DEBUG.P("CompletionFailure="+ex);
return typeNotFound;
}finally{
DEBUG.P(0,this,"loadClass(Env<AttrContext> env, Name name)");
}
}
/** Find qualified member type.
* @param env The current environment.
* @param site The original type from where the selection takes
* place.
* @param name The type's name.
* @param c The class to search for the member type. This is
* always a superclass or implemented interface of
* site's class.
*/
Symbol findMemberType(Env<AttrContext> env,
Type site,
Name name,
TypeSymbol c) {
DEBUG.P(this,"findMemberType(4)");
DEBUG.P("env="+env);
DEBUG.P("Type site="+site);
DEBUG.P("site.tag="+TypeTags.toString(site.tag));
DEBUG.P("Name name="+name);
DEBUG.P("TypeSymbol c="+c);
DEBUG.P("c.completer="+c.completer);
/*注释里的内容是我加的
if(c!=null) {
DEBUG.P("c.getClass()="+c.getClass());
if(c instanceof PackageSymbol)
DEBUG.P("c.members_field="+((PackageSymbol)c).members_field);
else if(c instanceof ClassSymbol) {
DEBUG.P("c instanceof ClassSymbol");
ClassSymbol myClassSymbol=(ClassSymbol)c;
//DEBUG.P("myClassSymbol.members_field="+myClassSymbol.members_field);
Scope myScope=myClassSymbol.members_field;
DEBUG.P("myScope="+myScope);
}
}
//下面这行很怪异,会调用complete()
//DEBUG.P("c.members()="+c.members());
//而下面这行却不会调用complete()
//Scope.Entry e = c.members().lookup(name);
问题已解决:因为在调用到Scope.toString()方法时，Scope.Entry.sym有
可能有MethodSymbol，而调用MethodSymbol.toString()会触
发对MethodSymbol的complete()，相反调用其它种类的Symbol(如ClassSymbol)
的toString()方法不会触发它的complete()
*/
DEBUG.P("c.members()="+c.members());
Symbol bestSoFar = typeNotFound;
Symbol sym;
Scope.Entry e = c.members().lookup(name);
DEBUG.P("e.scope="+e.scope);
while (e.scope != null) {
if (e.sym.kind == TYP) {
return isAccessible(env, site, e.sym)
? e.sym
: new AccessError(env, site, e.sym);
}
e = e.next();
}
Type st = types.supertype(c.type);
DEBUG.P("st="+st);
DEBUG.P("st.tag="+TypeTags.toString(st.tag));
if (st != null && st.tag == CLASS) {
sym = findMemberType(env, site, name, st.tsym);
DEBUG.P("sym.kind="+Kinds.toString(sym.kind));
DEBUG.P("bestSoFar.kind="+Kinds.toString(bestSoFar.kind));
if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
DEBUG.P("bestSoFar.kind != AMBIGUOUS="+(bestSoFar.kind != AMBIGUOUS));
DEBUG.P("c.type="+c.type);
DEBUG.P("c.completer="+c.completer);
DEBUG.P("types.interfaces(c.type)="+types.interfaces(c.type));
for (List<Type> l = types.interfaces(c.type);
bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
l = l.tail) {
sym = findMemberType(env, site, name, l.head.tsym);
if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
sym.owner != bestSoFar.owner)
bestSoFar = new AmbiguityError(bestSoFar, sym);
else if (sym.kind < bestSoFar.kind)
bestSoFar = sym;
}
DEBUG.P("bestSoFar="+bestSoFar);
DEBUG.P(0,this,"findMemberType(4)");
return bestSoFar;
}
/** Find a global type in given scope and load corresponding class.
* @param env The current environment.
* @param scope The scope in which to look for the type.
* @param name The type's name.
*/
Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
DEBUG.P(this,"findGlobalType(3)");
DEBUG.P("env="+env);
DEBUG.P("scope="+scope);
DEBUG.P("name="+name);
Symbol bestSoFar = typeNotFound;
for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
Symbol sym = loadClass(env, e.sym.flatName());
DEBUG.P("bestSoFar.kind="+Kinds.toString(bestSoFar.kind));
DEBUG.P("sym.kind="+Kinds.toString(sym.kind));
if (bestSoFar.kind == TYP && sym.kind == TYP &&
bestSoFar != sym)
return new AmbiguityError(bestSoFar, sym);
else if (sym.kind < bestSoFar.kind)
bestSoFar = sym;
}
DEBUG.P("bestSoFar="+bestSoFar);
DEBUG.P(0,this,"findGlobalType(3)");
return bestSoFar;
}
/** Find an unqualified type symbol.
* @param env The current environment.
* @param name The type's name.
*/
Symbol findType(Env<AttrContext> env, Name name) {
Symbol bestSoFar = typeNotFound;
Symbol sym;
try{
//DEBUG.ON();
DEBUG.P(this,"findType(2)");
DEBUG.P("name="+name);
DEBUG.P("env="+env);
DEBUG.P("env.outer="+env.outer);
/*
先从当前env.info.scope中查找name，
没找到时再根据env.enclClass.sym查找，
因为env.enclClass.sym是ClassSymbol类的实例引用,
所以实际是在ClassSymbol的members_field中查找name,
如还没找到再找ClassSymbol.type的超类以及所有实现的接口,
如还没找到再在env.outer中按上面的方式查找.
经过上面后(直到env.outer==null，即topLevelEnv),如还没找到
再找env.toplevel.namedImportScope,
再找env.toplevel.packge.members(),
再找env.toplevel.starImportScope
*/
boolean staticOnly = false;
//为什么结束条件是env1.outer != null呢?
//因为当env1.outer == null时，表示env1是最顶层了，
//最顶层的env.enclClass.sym.members_field是Symtab中预定义
//的符号是没有TYP类型的基本符号，所以没必要查找了，
//被遗漏的namedImportScope在退出for时再查找
for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
// <editor-fold defaultstate="collapsed">
DEBUG.P("env1.info.staticLevel="+env1.info.staticLevel);
DEBUG.P("env1.outer.info.staticLevel="+env1.outer.info.staticLevel);
if (isStatic(env1)) staticOnly = true;
DEBUG.P("staticOnly="+staticOnly);
DEBUG.P("env1.info.scope="+env1.info.scope);
for (Scope.Entry e = env1.info.scope.lookup(name);
e.scope != null;
e = e.next()) {
DEBUG.P("e.sym="+e.sym);
DEBUG.P("e.sym.kind="+Kinds.toString(e.sym.kind));
if (e.sym.kind == TYP) {
DEBUG.P("e.sym.type.tag="+TypeTags.toString(e.sym.type.tag));
DEBUG.P("e.sym.owner="+e.sym.owner);
DEBUG.P("e.sym.owner.kind="+Kinds.toString(e.sym.owner.kind));
/*错误例子:
bin\mysrc\my\test\Test.java:28: 无法从静态上下文中引用非静态 类型变量的限制范围T
public static <M extends T,S> int[] myMethod(final M m,S[] s[],int i,Str
ing s2,int... ii)[] throws Exception,Error{
^
这里的错误提示位置有点怪，虽然错误是在static方法myMethod中引用非静态 类型变量T，
但错误提示位置是在Exception，而不是在<M extends T,S>下
*/
if (staticOnly &&
e.sym.type.tag == TYPEVAR &&
e.sym.owner.kind == TYP) return new StaticError(e.sym);
DEBUG.P("已找到 "+e.sym+" 在env="+env1.info.scope);
return e.sym;
}
}
sym = findMemberType(env1, env1.enclClass.sym.type, name,
env1.enclClass.sym);
if (staticOnly && sym.kind == TYP &&
sym.type.tag == CLASS &&
sym.type.getEnclosingType().tag == CLASS &&
env1.enclClass.sym.type.isParameterized() &&
sym.type.getEnclosingType().isParameterized())
return new StaticError(sym);
else if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
if ((encl.sym.flags() & STATIC) != 0)
staticOnly = true;
// </editor-fold>
}
DEBUG.P("env.tree.tag="+env.tree.myTreeTag());
if (env.tree.tag != JCTree.IMPORT) {
sym = findGlobalType(env, env.toplevel.namedImportScope, name);
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
sym = findGlobalType(env, env.toplevel.packge.members(), name);
DEBUG.P("sym="+sym);
DEBUG.P("sym.exists()="+sym.exists());
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
sym = findGlobalType(env, env.toplevel.starImportScope, name);
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
return bestSoFar;
}finally{
//DEBUG.P("env.toplevel.namedImportScope="+env.toplevel.namedImportScope);
//DEBUG.P("env.toplevel.packge.members()="+env.toplevel.packge.members());
//DEBUG.P("env.toplevel.starImportScope="+env.toplevel.starImportScope);
//DEBUG.P("Symbol bestSoFar="+bestSoFar);
DEBUG.P("bestSoFar.kind="+Kinds.toString(bestSoFar.kind));
DEBUG.P(0,this,"findType(2)");
//DEBUG.OFF();
}
}
/** Find an unqualified identifier which matches a specified kind set.
* @param env The current environment.
* @param name The indentifier's name.
* @param kind Indicates the possible symbol kinds
* (a subset of VAL, TYP, PCK).
*/
Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
try {
DEBUG.P(this,"findIdent(3)");
DEBUG.P("name="+name);
DEBUG.P("kind="+Kinds.toString(kind));
DEBUG.P("syms.packages.size="+syms.packages.size()+" keySet="+syms.packages.keySet());
Symbol bestSoFar = typeNotFound; //kind=ABSENT_TYP是Kinds类中定义的最大值
Symbol sym;
if ((kind & VAR) != 0) {
sym = findVar(env, name);
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
if ((kind & TYP) != 0) {
sym = findType(env, name);
DEBUG.P("sym="+sym);
DEBUG.P("sym.exists()="+sym.exists());
DEBUG.P("sym.kind="+sym.kind+" "+Kinds.toString(sym.kind));
DEBUG.P("bestSoFar.kind="+bestSoFar.kind+" "+Kinds.toString(bestSoFar.kind));
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
//如果是一个不存在的包名也同样加入syms.packages中
DEBUG.P("((kind & PCK) != 0)="+((kind & PCK) != 0));
if ((kind & PCK) != 0) return reader.enterPackage(name);
else return bestSoFar;
}finally{
DEBUG.P("syms.packages.size="+syms.packages.size()+" keySet="+syms.packages.keySet());
DEBUG.P(0,this,"findIdent(3)");
}
}
/** Find an identifier in a package which matches a specified kind set.
* @param env The current environment.
* @param name The identifier's name.
* @param kind Indicates the possible symbol kinds
* (a nonempty subset of TYP, PCK).
*/
Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
Name name, int kind) {
try {//我加上的
DEBUG.P(this,"findIdentInPackage(4)");
DEBUG.P("env="+env);
DEBUG.P("pck="+pck);
DEBUG.P("name="+name);
DEBUG.P("kind="+Kinds.toString(kind));
Name fullname = TypeSymbol.formFullName(name, pck);
DEBUG.P("fullname="+fullname);
Symbol bestSoFar = typeNotFound;
PackageSymbol pack = null;
if ((kind & PCK) != 0) {
pack = reader.enterPackage(fullname);
DEBUG.P("pack.exists()="+pack.exists());
if (pack.exists()) return pack;
}
if ((kind & TYP) != 0) {
Symbol sym = loadClass(env, fullname);
DEBUG.P("sym.exists()="+sym.exists());
DEBUG.P("name="+name);
DEBUG.P("sym.name="+sym.name);
if (sym.exists()) {
// don't allow programs to use flatnames
if (name == sym.name) return sym;
}
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
return (pack != null) ? pack : bestSoFar;
}finally{//我加上的
DEBUG.P(0,this,"findIdentInPackage(4)");
}
}
/** Find an identifier among the members of a given type `site'.
* @param env The current environment.
* @param site The type containing the symbol to be found.
* @param name The identifier's name.
* @param kind Indicates the possible symbol kinds
* (a subset of VAL, TYP).
*/
Symbol findIdentInType(Env<AttrContext> env, Type site,
Name name, int kind) {
try {//我加上的
DEBUG.P(this,"findIdentInType(4)");
DEBUG.P("site="+site);
DEBUG.P("name="+name);
DEBUG.P("kind="+Kinds.toString(kind));
Symbol bestSoFar = typeNotFound;
Symbol sym;
if ((kind & VAR) != 0) {
sym = findField(env, site, name, site.tsym);
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
if ((kind & TYP) != 0) {
sym = findMemberType(env, site, name, site.tsym);
if (sym.exists()) return sym;
else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
}
return bestSoFar;
}finally{//我加上的
DEBUG.P(0,this,"findIdentInType(4)");
}
}
/* ***************************************************************************
* Access checking
* The following methods convert ResolveErrors to ErrorSymbols, issuing
* an error message in the process
****************************************************************************/
/** If `sym' is a bad symbol: report error and return errSymbol
* else pass through unchanged,
* additional arguments duplicate what has been used in trying to find the
* symbol (--> flyweight pattern). This improves performance since we
* expect misses to happen frequently.
*
* @param sym The symbol that was found, or a ResolveError.
* @param pos The position to use for error reporting.
* @param site The original type from where the selection took place.
* @param name The symbol's name.
* @param argtypes The invocation's value arguments,
* if we looked for a method.
* @param typeargtypes The invocation's type arguments,
* if we looked for a method.
*/
Symbol access(Symbol sym,
DiagnosticPosition pos,
Type site,
Name name,
boolean qualified,
List<Type> argtypes,
List<Type> typeargtypes) {
DEBUG.P(this,"access(7)");
if (sym.kind >= AMBIGUOUS) {
// printscopes(site.tsym.members());//DEBUG
if (!site.isErroneous() &&
!Type.isErroneous(argtypes) &&
(typeargtypes==null || !Type.isErroneous(typeargtypes)))
((ResolveError)sym).report(log, pos, site, name, argtypes, typeargtypes);
DEBUG.P("sym.name1="+sym.name);
do {
sym = ((ResolveError)sym).sym;
DEBUG.P("sym.kind="+Kinds.toString(sym.kind));
} while (sym.kind >= AMBIGUOUS);
DEBUG.P("sym.name2="+sym.name);
DEBUG.P("sym2="+sym);
//||号前部份对应ResolveError，后面部分对应ResolveError的三个子类
if (sym == syms.errSymbol // preserve the symbol name through errors
|| ((sym.kind & ERRONEOUS) == 0 // make sure an error symbol is returned
&& (sym.kind & TYP) != 0))
sym = new ErrorType(name, qualified?site.tsym:syms.noSymbol).tsym;
}
DEBUG.P("sym="+sym);
DEBUG.P(0,this,"access(7)");
return sym;
}
/** Same as above, but without type arguments and arguments.
*/
Symbol access(Symbol sym,
DiagnosticPosition pos,
Type site,
Name name,
boolean qualified) {
try {
DEBUG.P(this,"access(5)");
/*
DEBUG.P("sym.name="+sym.name);
//DEBUG.P("site="+site);
DEBUG.P("site.tag="+TypeTags.toString(site.tag));
if(site.tag==CLASS && site.tsym!=null) {
ClassSymbol myClassSymbol=(ClassSymbol)site.tsym;
DEBUG.P("site.tsym.members_field="+myClassSymbol.members_field);
}
DEBUG.P("name="+name);
DEBUG.P("qualified="+qualified);
DEBUG.P("sym.kind="+Kinds.toString(sym.kind));
DEBUG.P("if (sym.kind >= AMBIGUOUS)="+(sym.kind >= AMBIGUOUS));
*/
DEBUG.P("sym="+sym.name+" kind="+Kinds.toString(sym.kind)+" >=AMBIGUOUS="+(sym.kind >= AMBIGUOUS));
//没发生ResolveErrors时直接返回sym
if (sym.kind >= AMBIGUOUS)
return access(sym, pos, site, name, qualified, List.<Type>nil(), null);
else
return sym;
}finally{
DEBUG.P(0,this,"access(5)");
}
}
/** Check that sym is not an abstract method.
*/
void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
if ((sym.flags() & ABSTRACT) != 0)
log.error(pos, "abstract.cant.be.accessed.directly",
kindName(sym), sym, sym.location());
}
/* ***************************************************************************
* Debugging
****************************************************************************/
/** print all scopes starting with scope s and proceeding outwards.
* used for debugging.
*/
public void printscopes(Scope s) {
while (s != null) {
if (s.owner != null)
System.err.print(s.owner + ": ");
for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
if ((e.sym.flags() & ABSTRACT) != 0)
System.err.print("abstract ");
System.err.print(e.sym + " ");
}
System.err.println();
s = s.next;
}
}
void printscopes(Env<AttrContext> env) {
while (env.outer != null) {
System.err.println("------------------------------");
printscopes(env.info.scope);
env = env.outer;
}
}
public void printscopes(Type t) {
while (t.tag == CLASS) {
printscopes(t.tsym.members());
t = types.supertype(t);
}
}
/* ***************************************************************************
* Name resolution
* Naming conventions are as for symbol lookup
* Unlike the find... methods these methods will report access errors
****************************************************************************/
/** Resolve an unqualified (non-method) identifier.
* @param pos The position to use for error reporting.
* @param env The environment current at the identifier use.
* @param name The identifier's name.
* @param kind The set of admissible symbol kinds for the identifier.
*/
Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
Name name, int kind) {
Symbol sym=null;//我加上的
try {//我加上的
DEBUG.P(this,"resolveIdent(4)");
//DEBUG.P("env="+env);
//DEBUG.P("name="+name);
//DEBUG.P("kind="+Kinds.toString(kind));
return sym= access(
findIdent(env, name, kind),
pos, env.enclClass.sym.type, name, false);
}finally{
DEBUG.P("name="+name);
DEBUG.P("kind="+Kinds.toString(kind));
if(sym!=null) {
DEBUG.P("sym ="+sym);
DEBUG.P("sym.type="+sym.type);
} else
DEBUG.P("sym =null");
DEBUG.P(0,this,"resolveIdent(4)");
}
}
/** Resolve an unqualified method identifier.
* @param pos The position to use for error reporting.
* @param env The environment current at the method invocation.
* @param name The identifier's name.
* @param argtypes The types of the invocation's value arguments.
* @param typeargtypes The types of the invocation's type arguments.
*/
Symbol resolveMethod(DiagnosticPosition pos,
Env<AttrContext> env,
Name name,//方法名
List<Type> argtypes,//调用方法时指定的参数的类型
//调用方法时指定的类型参数，实际上typeargtypes.size=0，
//因为<ClassA>methodName(...)这样的语法是错误的
List<Type> typeargtypes) {
try {
DEBUG.P(this,"resolveMethod(5)");
DEBUG.P("env="+env);
DEBUG.P("name="+name);
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
Symbol sym = findFun(env, name, argtypes, typeargtypes, false, env.info.varArgs=false);
if (varargsEnabled && sym.kind >= WRONG_MTHS) {
sym = findFun(env, name, argtypes, typeargtypes, true, false);
if (sym.kind >= WRONG_MTHS)
sym = findFun(env, name, argtypes, typeargtypes, true, env.info.varArgs=true);
}
if (sym.kind >= AMBIGUOUS) {
sym = access(
sym, pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
}
return sym;
}finally{
DEBUG.P(0,this,"resolveMethod(5)");
}
}
/** Resolve a qualified method identifier
* @param pos The position to use for error reporting.
* @param env The environment current at the method invocation.
* @param site The type of the qualifying expression, in which
* identifier is searched.
* @param name The identifier's name.
* @param argtypes The types of the invocation's value arguments.
* @param typeargtypes The types of the invocation's type arguments.
*/
Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
Type site, Name name, List<Type> argtypes,
List<Type> typeargtypes) {
DEBUG.P(this,"resolveQualifiedMethod(6)");
DEBUG.P("env="+env);
DEBUG.P("site="+site);
DEBUG.P("name="+name);
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
Symbol sym = findMethod(env, site, name, argtypes, typeargtypes, false,
env.info.varArgs=false, false);
if (varargsEnabled && sym.kind >= WRONG_MTHS) {
sym = findMethod(env, site, name, argtypes, typeargtypes, true,
false, false);
if (sym.kind >= WRONG_MTHS)
sym = findMethod(env, site, name, argtypes, typeargtypes, true,
env.info.varArgs=true, false);
}
if (sym.kind >= AMBIGUOUS) {
sym = access(sym, pos, site, name, true, argtypes, typeargtypes);
}
DEBUG.P("sym="+sym+" sym.kind="+Kinds.toString(sym.kind));
DEBUG.P(0,this,"resolveQualifiedMethod(6)");
return sym;
}
/** Resolve a qualified method identifier, throw a fatal error if not
* found.
* @param pos The position to use for error reporting.
* @param env The environment current at the method invocation.
* @param site The type of the qualifying expression, in which
* identifier is searched.
* @param name The identifier's name.
* @param argtypes The types of the invocation's value arguments.
* @param typeargtypes The types of the invocation's type arguments.
*/
public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
Type site, Name name,
List<Type> argtypes,
List<Type> typeargtypes) {
Symbol sym = resolveQualifiedMethod(
pos, env, site, name, argtypes, typeargtypes);
if (sym.kind == MTH) return (MethodSymbol)sym;
else throw new FatalError(
JCDiagnostic.fragment("fatal.err.cant.locate.meth",
name));
}
/** Resolve constructor.
* @param pos The position to use for error reporting.
* @param env The environment current at the constructor invocation.
* @param site The type of class for which a constructor is searched.
* @param argtypes The types of the constructor invocation's value
* arguments.
* @param typeargtypes The types of the constructor invocation's type
* arguments.
*/
Symbol resolveConstructor(DiagnosticPosition pos,
Env<AttrContext> env,
Type site,
List<Type> argtypes,
List<Type> typeargtypes) {
DEBUG.P(this,"resolveConstructor(5)");
Symbol sym = resolveConstructor(pos, env, site, argtypes, typeargtypes, false, env.info.varArgs=false);
if (varargsEnabled && sym.kind >= WRONG_MTHS) {
sym = resolveConstructor(pos, env, site, argtypes, typeargtypes, true, false);
if (sym.kind >= WRONG_MTHS)
sym = resolveConstructor(pos, env, site, argtypes, typeargtypes, true, env.info.varArgs=true);
}
if (sym.kind >= AMBIGUOUS) {
sym = access(sym, pos, site, names.init, true, argtypes, typeargtypes);
}
DEBUG.P("sym="+sym);
DEBUG.P(0,this,"resolveConstructor(5)");
return sym;
}
/** Resolve constructor.
* @param pos The position to use for error reporting.
* @param env The environment current at the constructor invocation.
* @param site The type of class for which a constructor is searched.
* @param argtypes The types of the constructor invocation's value
* arguments.
* @param typeargtypes The types of the constructor invocation's type
* arguments.
* @param allowBoxing Allow boxing and varargs conversions.
* @param useVarargs Box trailing arguments into an array for varargs.
*/
Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
Type site, List<Type> argtypes,
List<Type> typeargtypes,
boolean allowBoxing,
boolean useVarargs) {
DEBUG.P(this,"resolveConstructor(7)");
DEBUG.P("site="+site);
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
DEBUG.P("allowBoxing="+allowBoxing);
DEBUG.P("useVarargs="+useVarargs);
Symbol sym = findMethod(env, site,
names.init, argtypes,
typeargtypes, allowBoxing,
useVarargs, false);
DEBUG.P("sym.flags()="+Flags.toString(sym.flags()));
DEBUG.P("env.info.scope.owner="+env.info.scope.owner);
DEBUG.P("env.info.scope.owner.flags()="+Flags.toString(env.info.scope.owner.flags()));
DEBUG.P("env.info.scope.owner.outermostClass()="+env.info.scope.owner.outermostClass());
DEBUG.P("sym.outermostClass()="+sym.outermostClass());
/*
package test.attr;
class A{
@Deprecated
A(){}
class B extends A{
//sym.flags()=0x20000 deprecated
//env.info.scope.owner=B()
//env.info.scope.owner.flags()=0x0
//env.info.scope.owner.outermostClass()=test.attr.A
//sym.outermostClass()=test.attr.A
B(){
super(); //不会警告，因为B是A的成员
}
}
}
class B extends A{
//sym.flags()=0x40020000 deprecated acyclic
//env.info.scope.owner=B()
//env.info.scope.owner.flags()=0x0
//env.info.scope.owner.outermostClass()=test.attr.B
//sym.outermostClass()=test.attr.A
B(){
super(); //警告：[deprecation] test.attr.A 中的 A() 已过时
}
}
class C extends A{
//sym.flags()=0x40020000 deprecated acyclic
//env.info.scope.owner=C()
//env.info.scope.owner.flags()=0x20000 deprecated
//env.info.scope.owner.outermostClass()=test.attr.C
//sym.outermostClass()=test.attr.A
@Deprecated
C(){
super(); //不会警告，因为C()已有@Deprecated
}
}
*/
if ((sym.flags() & DEPRECATED) != 0 &&
(env.info.scope.owner.flags() & DEPRECATED) == 0 &&
env.info.scope.owner.outermostClass() != sym.outermostClass())
chk.warnDeprecated(pos, sym);
DEBUG.P("sym="+sym);
DEBUG.P(0,this,"resolveConstructor(7)");
return sym;
}
/** Resolve a constructor, throw a fatal error if not found.
* @param pos The position to use for error reporting.
* @param env The environment current at the method invocation.
* @param site The type to be constructed.
* @param argtypes The types of the invocation's value arguments.
* @param typeargtypes The types of the invocation's type arguments.
*/
public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
Type site,
List<Type> argtypes,
List<Type> typeargtypes) {
Symbol sym = resolveConstructor(
pos, env, site, argtypes, typeargtypes);
if (sym.kind == MTH) return (MethodSymbol)sym;
else throw new FatalError(
JCDiagnostic.fragment("fatal.err.cant.locate.ctor", site));
}
/** Resolve operator.
* @param pos The position to use for error reporting.
* @param optag The tag of the operation tree.
* @param env The environment current at the operation.
* @param argtypes The types of the operands.
*/
Symbol resolveOperator(DiagnosticPosition pos, int optag,
Env<AttrContext> env, List<Type> argtypes) {
try {
DEBUG.P(this,"resolveOperator(4)");
DEBUG.P("argtypes="+argtypes);
Name name = treeinfo.operatorName(optag);
DEBUG.P("name="+name);
Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
null, false, false, true);
if (boxingEnabled && sym.kind >= WRONG_MTHS)
sym = findMethod(env, syms.predefClass.type, name, argtypes,
null, true, false, true);
return access(sym, pos, env.enclClass.sym.type, name,
false, argtypes, null);
}finally{
DEBUG.P(0,this,"resolveOperator(4)");
}
}
/** Resolve operator.
* @param pos The position to use for error reporting.
* @param optag The tag of the operation tree.
* @param env The environment current at the operation.
* @param arg The type of the operand.
*/
Symbol resolveUnaryOperator(DiagnosticPosition pos, int optag, Env<AttrContext> env, Type arg) {
return resolveOperator(pos, optag, env, List.of(arg));
}
/** Resolve binary operator.
* @param pos The position to use for error reporting.
* @param optag The tag of the operation tree.
* @param env The environment current at the operation.
* @param left The types of the left operand.
* @param right The types of the right operand.
*/
Symbol resolveBinaryOperator(DiagnosticPosition pos,
int optag,
Env<AttrContext> env,
Type left,
Type right) {
return resolveOperator(pos, optag, env, List.of(left, right));
}
/**
* Resolve `c.name' where name == this or name == super.
* @param pos The position to use for error reporting.
* @param env The environment current at the expression.
* @param c The qualifier.
* @param name The identifier's name.
*/
Symbol resolveSelf(DiagnosticPosition pos,
Env<AttrContext> env,
TypeSymbol c,
Name name) {
try {//我加上的
DEBUG.P(this,"resolveSelf(4)");
DEBUG.P("c="+c);
DEBUG.P("name="+name);
Env<AttrContext> env1 = env;
boolean staticOnly = false;
while (env1.outer != null) {
if (isStatic(env1)) staticOnly = true;
DEBUG.P("staticOnly="+staticOnly);
DEBUG.P("env1.enclClass.sym="+env1.enclClass.sym);
if (env1.enclClass.sym == c) {
Symbol sym = env1.info.scope.lookup(name).sym;
DEBUG.P("sym="+sym);
DEBUG.P("env1.info.scope="+env1.info.scope);
if (sym != null) {
if (staticOnly) sym = new StaticError(sym);
return access(sym, pos, env.enclClass.sym.type,
name, true);
}
}
if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
env1 = env1.outer;
}
DEBUG.P("在"+c+"中找不到"+name);
log.error(pos, "not.encl.class", c);
return syms.errSymbol;
}finally{//我加上的
DEBUG.P(0,this,"resolveSelf(4)");
}
}
/**
* Resolve `c.this' for an enclosing class c that contains the
* named member.
* @param pos The position to use for error reporting.
* @param env The environment current at the expression.
* @param member The member that must be contained in the result.
*/
Symbol resolveSelfContaining(DiagnosticPosition pos,
Env<AttrContext> env,
Symbol member) {
try {//我加上的
DEBUG.P(this,"resolveSelfContaining(3)");
DEBUG.P("member="+member);
Name name = names._this;
Env<AttrContext> env1 = env;
boolean staticOnly = false;
while (env1.outer != null) {
if (isStatic(env1)) staticOnly = true;
if (env1.enclClass.sym.isSubClass(member.owner, types) &&
isAccessible(env, env1.enclClass.sym.type, member)) {
Symbol sym = env1.info.scope.lookup(name).sym;
if (sym != null) {
if (staticOnly) sym = new StaticError(sym);
return access(sym, pos, env.enclClass.sym.type,
name, true);
}
}
if ((env1.enclClass.sym.flags() & STATIC) != 0)
staticOnly = true;
env1 = env1.outer;
}
log.error(pos, "encl.class.required", member);
return syms.errSymbol;
}finally{//我加上的
DEBUG.P(0,this,"resolveSelfContaining(3)");
}
}
/**
* Resolve an appropriate implicit this instance for t's container.
* JLS2 8.8.5.1 and 15.9.2
*/
Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
DEBUG.P(this,"resolveImplicitThis(3)");
DEBUG.P("env="+env);
DEBUG.P("t="+t);
DEBUG.P("t.tsym.owner="+t.tsym.owner);
DEBUG.P("t.tsym.owner.kind="+Kinds.toString(t.tsym.owner.kind));
Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
: resolveSelfContaining(pos, env, t.tsym)).type;
DEBUG.P("env.info.isSelfCall="+env.info.isSelfCall);
DEBUG.P("if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)="+(env.info.isSelfCall && thisType.tsym == env.enclClass.sym));
if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
log.error(pos, "cant.ref.before.ctor.called", "this");
DEBUG.P("thisType="+thisType);
DEBUG.P(0,this,"resolveImplicitThis(3)");
return thisType;
}
/* ***************************************************************************
* Methods related to kinds
****************************************************************************/
/** A localized string describing a given kind.
*/
static JCDiagnostic kindName(int kind) {
switch (kind) {
case PCK: return JCDiagnostic.fragment("kindname.package");
case TYP: return JCDiagnostic.fragment("kindname.class");
case VAR: return JCDiagnostic.fragment("kindname.variable");
case VAL: return JCDiagnostic.fragment("kindname.value");
case MTH: return JCDiagnostic.fragment("kindname.method");
default : return JCDiagnostic.fragment("kindname",
Integer.toString(kind)); //debug
}
}
static JCDiagnostic kindName(Symbol sym) {
switch (sym.getKind()) {
case PACKAGE:
return JCDiagnostic.fragment("kindname.package");
case ENUM:
case ANNOTATION_TYPE:
case INTERFACE:
case CLASS:
return JCDiagnostic.fragment("kindname.class");
case TYPE_PARAMETER:
return JCDiagnostic.fragment("kindname.type.variable");
case ENUM_CONSTANT:
case FIELD:
case PARAMETER:
case LOCAL_VARIABLE:
case EXCEPTION_PARAMETER:
return JCDiagnostic.fragment("kindname.variable");
case METHOD:
case CONSTRUCTOR:
case STATIC_INIT:
case INSTANCE_INIT:
return JCDiagnostic.fragment("kindname.method");
default:
if (sym.kind == VAL)
// I don't think this can happen but it can't harm
// playing it safe --ahe
return JCDiagnostic.fragment("kindname.value");
else
return JCDiagnostic.fragment("kindname", sym.getKind()); // debug
}
}
/** A localized string describing a given set of kinds.
*/
static JCDiagnostic kindNames(int kind) {
StringBuffer key = new StringBuffer();
key.append("kindname");
if ((kind & VAL) != 0)
key.append(((kind & VAL) == VAR) ? ".variable" : ".value");
if ((kind & MTH) != 0) key.append(".method");
if ((kind & TYP) != 0) key.append(".class");
if ((kind & PCK) != 0) key.append(".package");
return JCDiagnostic.fragment(key.toString(), kind);
}
/** A localized string describing the kind -- either class or interface --
* of a given type.
*/
static JCDiagnostic typeKindName(Type t) {
if (t.tag == TYPEVAR ||
t.tag == CLASS && (t.tsym.flags() & COMPOUND) != 0)
return JCDiagnostic.fragment("kindname.type.variable.bound");
else if (t.tag == PACKAGE)
return JCDiagnostic.fragment("kindname.package");
else if ((t.tsym.flags_field & ANNOTATION) != 0)
return JCDiagnostic.fragment("kindname.annotation");
else if ((t.tsym.flags_field & INTERFACE) != 0)
return JCDiagnostic.fragment("kindname.interface");
else
return JCDiagnostic.fragment("kindname.class");
}
/** A localized string describing the kind of a missing symbol, given an
* error kind.
*/
static JCDiagnostic absentKindName(int kind) {
switch (kind) {
case ABSENT_VAR:
return JCDiagnostic.fragment("kindname.variable");
case WRONG_MTHS: case WRONG_MTH: case ABSENT_MTH:
return JCDiagnostic.fragment("kindname.method");
case ABSENT_TYP:
return JCDiagnostic.fragment("kindname.class");
default:
return JCDiagnostic.fragment("kindname", kind);
}
}
/* ***************************************************************************
* ResolveError classes, indicating error situations when accessing symbols
****************************************************************************/
public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
error.report(log, tree.pos(), type.getEnclosingType(), null, null, null);
}
/** Root class for resolve errors.
* Instances of this class indicate "Symbol not found".
* Instances of subclass indicate other errors.
*/
private class ResolveError extends Symbol {
ResolveError(int kind, Symbol sym, String debugName) {
super(kind, 0, null, null, null);
this.debugName = debugName;
this.sym = sym;
}
/** The name of the kind of error, for debugging only.
*/
final String debugName;
/** The symbol that was determined by resolution, or errSymbol if none
* was found.
*/
final Symbol sym;
/** The symbol that was a close mismatch, or null if none was found.
* wrongSym is currently set if a simgle method with the correct name, but
* the wrong parameters was found.
*/
Symbol wrongSym;
/** An auxiliary explanation set in case of instantiation errors.
*/
JCDiagnostic explanation;
public <R, P> R accept(ElementVisitor<R, P> v, P p) {
throw new AssertionError();
}
/** Print the (debug only) name of the kind of error.
*/
public String toString() {
return debugName + " wrongSym=" + wrongSym + " explanation=" + explanation;
}
/** Update wrongSym and explanation and return this.
*/
ResolveError setWrongSym(Symbol sym, JCDiagnostic explanation) {
this.wrongSym = sym;
this.explanation = explanation;
return this;
}
/** Update wrongSym and return this.
*/
ResolveError setWrongSym(Symbol sym) {
this.wrongSym = sym;
this.explanation = null;
return this;
}
public boolean exists() {
switch (kind) {
case HIDDEN:
case ABSENT_VAR:
case ABSENT_MTH:
case ABSENT_TYP:
return false;
default:
return true;
}
}
/** Report error.
* @param log The error log to be used for error reporting.
* @param pos The position to be used for error reporting.
* @param site The original type from where the selection took place.
* @param name The name of the symbol to be resolved.
* @param argtypes The invocation's value arguments,
* if we looked for a method.
* @param typeargtypes The invocation's type arguments,
* if we looked for a method.
*/
void report(Log log, DiagnosticPosition pos, Type site, Name name,
List<Type> argtypes, List<Type> typeargtypes) {
try {//我加上的
DEBUG.P(this,"report(6)");
DEBUG.P("site="+site);
DEBUG.P("name="+name);
DEBUG.P("kind="+Kinds.toString(kind));
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
if (name != name.table.error) {
JCDiagnostic kindname = absentKindName(kind);
String idname = name.toString();
String args = "";
String typeargs = "";
if (kind >= WRONG_MTHS && kind <= ABSENT_MTH) {
if (isOperator(name)) {
log.error(pos, "operator.cant.be.applied",
name, Type.toString(argtypes));
return;
}
if (name == name.table.init) {
kindname = JCDiagnostic.fragment("kindname.constructor");
idname = site.tsym.name.toString();
}
args = "(" + Type.toString(argtypes) + ")";
if (typeargtypes != null && typeargtypes.nonEmpty())
typeargs = "<" + Type.toString(typeargtypes) + ">";
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
}
if (kind == WRONG_MTH) {
log.error(pos,
"cant.apply.symbol" + (explanation != null ? ".1" : ""),
wrongSym.asMemberOf(site, types),
wrongSym.location(site, types),
typeargs,
Type.toString(argtypes),
explanation);
} else if (site.tsym.name.len != 0) {
DEBUG.P("site.tsym.kind="+Kinds.toString(site.tsym.kind));
if (site.tsym.kind == PCK && !site.tsym.exists())
log.error(pos, "doesnt.exist", site.tsym);
else
log.error(pos, "cant.resolve.location",
kindname, idname, args, typeargs,
typeKindName(site), site);
} else {
log.error(pos, "cant.resolve", kindname, idname, args, typeargs);
}
}
}finally{//我加上的
DEBUG.P(0,this,"report(6)");
}
}
//where
/** A name designates an operator if it consists
* of a non-empty sequence of operator symbols +-~!/*%&|^<>=
*/
boolean isOperator(Name name) {
int i = 0;
while (i < name.len &&
"+-~!*/%&|^<>=".indexOf(name.byteAt(i)) >= 0) i++;
return i > 0 && i == name.len;
}
}
/** Resolve error class indicating that a symbol is not accessible.
*/
class AccessError extends ResolveError {
AccessError(Symbol sym) {
this(null, null, sym);
}
AccessError(Env<AttrContext> env, Type site, Symbol sym) {
super(HIDDEN, sym, "access error");
this.env = env;
this.site = site;
if (debugResolve)
log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
}
private Env<AttrContext> env;
private Type site;
/** Report error.
* @param log The error log to be used for error reporting.
* @param pos The position to be used for error reporting.
* @param site The original type from where the selection took place.
* @param name The name of the symbol to be resolved.
* @param argtypes The invocation's value arguments,
* if we looked for a method.
* @param typeargtypes The invocation's type arguments,
* if we looked for a method.
*/
void report(Log log, DiagnosticPosition pos, Type site, Name name,
List<Type> argtypes, List<Type> typeargtypes) {
if (sym.owner.type.tag != ERROR) {
if (sym.name == sym.name.table.init && sym.owner != site.tsym)
new ResolveError(ABSENT_MTH, sym.owner, "absent method " + sym).report(
log, pos, site, name, argtypes, typeargtypes);
if ((sym.flags() & PUBLIC) != 0
|| (env != null && this.site != null
&& !isAccessible(env, this.site)))
log.error(pos, "not.def.access.class.intf.cant.access",
sym, sym.location());
else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0)
log.error(pos, "report.access", sym,
TreeInfo.flagNames(sym.flags() & (PRIVATE | PROTECTED)),
sym.location());
else
log.error(pos, "not.def.public.cant.access",
sym, sym.location());
}
}
}
/** Resolve error class indicating that an instance member was accessed
* from a static context.
*/
class StaticError extends ResolveError {
StaticError(Symbol sym) {
super(STATICERR, sym, "static error");
}
/** Report error.
* @param log The error log to be used for error reporting.
* @param pos The position to be used for error reporting.
* @param site The original type from where the selection took place.
* @param name The name of the symbol to be resolved.
* @param argtypes The invocation's value arguments,
* if we looked for a method.
* @param typeargtypes The invocation's type arguments,
* if we looked for a method.
*/
void report(Log log,
DiagnosticPosition pos,
Type site,
Name name,
List<Type> argtypes,
List<Type> typeargtypes) {
String symstr = ((sym.kind == TYP && sym.type.tag == CLASS)
? types.erasure(sym.type)
: sym).toString();
log.error(pos, "non-static.cant.be.ref",
kindName(sym), symstr);
}
}
/** Resolve error class indicating an ambiguous reference.
*/
class AmbiguityError extends ResolveError {
Symbol sym1;
Symbol sym2;
AmbiguityError(Symbol sym1, Symbol sym2) {
super(AMBIGUOUS, sym1, "ambiguity error");
DEBUG.P(this,"AmbiguityError(2)");
DEBUG.P("sym1="+sym1);
DEBUG.P("sym2="+sym2);
this.sym1 = sym1;
this.sym2 = sym2;
DEBUG.P(1,this,"AmbiguityError(2)");
}
/** Report error.
* @param log The error log to be used for error reporting.
* @param pos The position to be used for error reporting.
* @param site The original type from where the selection took place.
* @param name The name of the symbol to be resolved.
* @param argtypes The invocation's value arguments,
* if we looked for a method.
* @param typeargtypes The invocation's type arguments,
* if we looked for a method.
*/
void report(Log log, DiagnosticPosition pos, Type site, Name name,
List<Type> argtypes, List<Type> typeargtypes) {
try {//我加上的
DEBUG.P(this,"report(6)");
DEBUG.P("site="+site);
DEBUG.P("name="+name);
DEBUG.P("kind="+Kinds.toString(kind));
DEBUG.P("argtypes="+argtypes);
DEBUG.P("typeargtypes="+typeargtypes);
AmbiguityError pair = this;
while (true) {
if (pair.sym1.kind == AMBIGUOUS)
pair = (AmbiguityError)pair.sym1;
else if (pair.sym2.kind == AMBIGUOUS)
pair = (AmbiguityError)pair.sym2;
else break;
}
Name sname = pair.sym1.name;
DEBUG.P("sname="+sname);
if (sname == sname.table.init) sname = pair.sym1.owner.name;
log.error(pos, "ref.ambiguous", sname,
kindName(pair.sym1),
pair.sym1,
pair.sym1.location(site, types),
kindName(pair.sym2),
pair.sym2,
pair.sym2.location(site, types));
}finally{//我加上的
DEBUG.P(0,this,"report(6)");
}
}
}
}