jdk8-mips64-public/hotspot: src/share/vm/runtime/signature.hpp@98cb887364d3 (annotated)

src/share/vm/runtime/signature.hpp@98cb887364d3 (annotated)

src/share/vm/runtime/signature.hpp

Fri, 27 Feb 2009 13:27:09 -0800

author: twisti
date: Fri, 27 Feb 2009 13:27:09 -0800
changeset 1040: 98cb887364d3
parent 435: a61af66fc99e
child 1445: 354d3184f6b2
permissions: -rw-r--r--

6810672: Comment typos
Summary: I have collected some typos I have found while looking at the code.
Reviewed-by: kvn, never

 /*
  * Copyright 1997-2006 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.
  *
  * 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.
  *
  */
 // SignatureIterators iterate over a Java signature (or parts of it).
 // (Syntax according to: "The Java Virtual Machine Specification" by
 // Tim Lindholm & Frank Yellin; section 4.3 Descriptors; p. 89ff.)
 //
 // Example: Iterating over ([Lfoo;D)I using
 //                         0123456789
 //
 // iterate_parameters() calls: do_array(2, 7); do_double();
 // iterate_returntype() calls:                              do_int();
 // iterate()            calls: do_array(2, 7); do_double(); do_int();
 //
 // is_return_type()        is: false         ; false      ; true
 //
 // NOTE: The new optimizer has an alternate, for-loop based signature
 // iterator implemented in opto/type.cpp, TypeTuple::make().
 class SignatureIterator: public ResourceObj {
  protected:
   symbolHandle _signature;             // the signature to iterate over
   int          _index;                 // the current character index (only valid during iteration)
   int          _parameter_index;       // the current parameter index (0 outside iteration phase)
   BasicType    _return_type;
   void expect(char c);
   void skip_optional_size();
   int  parse_type();                   // returns the parameter size in words (0 for void)
   void check_signature_end();
  public:
   // Definitions used in generating and iterating the
   // bit field form of the signature generated by the
   // Fingerprinter.
   enum {
     static_feature_size    = 1,
     result_feature_size    = 4,
     result_feature_mask    = 0xF,
     parameter_feature_size = 4,
     parameter_feature_mask = 0xF,
       bool_parm            = 1,
       byte_parm            = 2,
       char_parm            = 3,
       short_parm           = 4,
       int_parm             = 5,
       long_parm            = 6,
       float_parm           = 7,
       double_parm          = 8,
       obj_parm             = 9,
       done_parm            = 10,  // marker for end of parameters
     // max parameters is wordsize minus
     //    The sign bit, termination field, the result and static bit fields
     max_size_of_parameters = (BitsPerLong-1 -
                               result_feature_size - parameter_feature_size -
                               static_feature_size) / parameter_feature_size
   };
   // Constructors
   SignatureIterator(symbolOop signature);
   SignatureIterator(Thread *thread, symbolOop signature);
   SignatureIterator(symbolHandle signature);
   // Iteration
   void dispatch_field();               // dispatches once for field signatures
   void iterate_parameters();           // iterates over parameters only
   void iterate_parameters( uint64_t fingerprint );
   void iterate_returntype();           // iterates over returntype only
   void iterate();                      // iterates over whole signature
   // Returns the word index of the current parameter;
   int  parameter_index() const         { return _parameter_index; }
   bool is_return_type() const          { return parameter_index() < 0; }
   BasicType get_ret_type() const       { return _return_type; }
   // Basic types
   virtual void do_bool  ()             = 0;
   virtual void do_char  ()             = 0;
   virtual void do_float ()             = 0;
   virtual void do_double()             = 0;
   virtual void do_byte  ()             = 0;
   virtual void do_short ()             = 0;
   virtual void do_int   ()             = 0;
   virtual void do_long  ()             = 0;
   virtual void do_void  ()             = 0;
   // Object types (begin indexes the first character of the entry, end indexes the first character after the entry)
   virtual void do_object(int begin, int end) = 0;
   virtual void do_array (int begin, int end) = 0;
 };
 // Specialized SignatureIterators: Used to compute signature specific values.
 class SignatureTypeNames : public SignatureIterator {
  protected:
   virtual void type_name(const char* name)   = 0;
   void do_bool()                       { type_name("jboolean"); }
   void do_char()                       { type_name("jchar"   ); }
   void do_float()                      { type_name("jfloat"  ); }
   void do_double()                     { type_name("jdouble" ); }
   void do_byte()                       { type_name("jbyte"   ); }
   void do_short()                      { type_name("jshort"  ); }
   void do_int()                        { type_name("jint"    ); }
   void do_long()                       { type_name("jlong"   ); }
   void do_void()                       { type_name("void"    ); }
   void do_object(int begin, int end)   { type_name("jobject" ); }
   void do_array (int begin, int end)   { type_name("jobject" ); }
  public:
   SignatureTypeNames(symbolHandle signature) : SignatureIterator(signature) {}
 };
 class SignatureInfo: public SignatureIterator {
  protected:
   bool      _has_iterated;             // need this because iterate cannot be called in constructor (set is virtual!)
   bool      _has_iterated_return;
   int       _size;
   void lazy_iterate_parameters()       { if (!_has_iterated) { iterate_parameters(); _has_iterated = true; } }
   void lazy_iterate_return()           { if (!_has_iterated_return) { iterate_returntype(); _has_iterated_return = true; } }
   virtual void set(int size, BasicType type) = 0;
   void do_bool  ()                     { set(T_BOOLEAN_size, T_BOOLEAN); }
   void do_char  ()                     { set(T_CHAR_size   , T_CHAR   ); }
   void do_float ()                     { set(T_FLOAT_size  , T_FLOAT  ); }
   void do_double()                     { set(T_DOUBLE_size , T_DOUBLE ); }
   void do_byte  ()                     { set(T_BYTE_size   , T_BYTE   ); }
   void do_short ()                     { set(T_SHORT_size  , T_SHORT  ); }
   void do_int   ()                     { set(T_INT_size    , T_INT    ); }
   void do_long  ()                     { set(T_LONG_size   , T_LONG   ); }
   void do_void  ()                     { set(T_VOID_size   , T_VOID   ); }
   void do_object(int begin, int end)   { set(T_OBJECT_size , T_OBJECT ); }
   void do_array (int begin, int end)   { set(T_ARRAY_size  , T_ARRAY  ); }
  public:
   SignatureInfo(symbolHandle signature) : SignatureIterator(signature) {
     _has_iterated = _has_iterated_return = false;
     _size         = 0;
     _return_type  = T_ILLEGAL;
   }
 };
 // Specialized SignatureIterator: Used to compute the argument size.
 class ArgumentSizeComputer: public SignatureInfo {
  private:
   void set(int size, BasicType type)   { _size += size; }
  public:
   ArgumentSizeComputer(symbolHandle signature) : SignatureInfo(signature) {}
   int       size()                     { lazy_iterate_parameters(); return _size; }
 };
 class ArgumentCount: public SignatureInfo {
  private:
   void set(int size, BasicType type)   { _size ++; }
  public:
   ArgumentCount(symbolHandle signature) : SignatureInfo(signature) {}
   int       size()                     { lazy_iterate_parameters(); return _size; }
 };
 // Specialized SignatureIterator: Used to compute the result type.
 class ResultTypeFinder: public SignatureInfo {
  private:
   void set(int size, BasicType type)   { _return_type = type; }
  public:
   BasicType type()                     { lazy_iterate_return(); return _return_type; }
   ResultTypeFinder(symbolHandle signature) : SignatureInfo(signature) {}
 };
 // Fingerprinter computes a unique ID for a given method. The ID
 // is a bitvector characterizing the methods signature (incl. the receiver).
 class Fingerprinter: public SignatureIterator {
  private:
   uint64_t _fingerprint;
   int _shift_count;
   methodHandle mh;
  public:
   void do_bool()    { _fingerprint |= (((uint64_t)bool_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_char()    { _fingerprint |= (((uint64_t)char_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_byte()    { _fingerprint |= (((uint64_t)byte_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_short()   { _fingerprint |= (((uint64_t)short_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_int()     { _fingerprint |= (((uint64_t)int_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_long()    { _fingerprint |= (((uint64_t)long_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_float()   { _fingerprint |= (((uint64_t)float_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_double()  { _fingerprint |= (((uint64_t)double_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_object(int begin, int end)  { _fingerprint |= (((uint64_t)obj_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_array (int begin, int end)  { _fingerprint |= (((uint64_t)obj_parm) << _shift_count); _shift_count += parameter_feature_size; }
   void do_void()    { ShouldNotReachHere(); }
   Fingerprinter(methodHandle method) : SignatureIterator(method->signature()) {
     mh = method;
     _fingerprint = 0;
   }
   Fingerprinter(Thread *thread, methodHandle method) : SignatureIterator(thread, method->signature()) {
     mh = method;
     _fingerprint = 0;
   }
   uint64_t fingerprint() {
     // See if we fingerprinted this method already
     if (mh->constMethod()->fingerprint() != CONST64(0)) {
       return mh->constMethod()->fingerprint();
     }
     if (mh->size_of_parameters() > max_size_of_parameters ) {
       _fingerprint = UCONST64(-1);
       mh->constMethod()->set_fingerprint(_fingerprint);
       return _fingerprint;
     }
     assert( (int)mh->result_type() <= (int)result_feature_mask, "bad result type");
     _fingerprint = mh->result_type();
     _fingerprint <<= static_feature_size;
     if (mh->is_static())  _fingerprint |= 1;
     _shift_count = result_feature_size + static_feature_size;
     iterate_parameters();
     _fingerprint |= ((uint64_t)done_parm) << _shift_count;// mark end of sig
     mh->constMethod()->set_fingerprint(_fingerprint);
     return _fingerprint;
   }
 };
 // Specialized SignatureIterator: Used for native call purposes
 class NativeSignatureIterator: public SignatureIterator {
  private:
   methodHandle _method;
 // We need separate JNI and Java offset values because in 64 bit mode,
 // the argument offsets are not in sync with the Java stack.
 // For example a long takes up 1 "C" stack entry but 2 Java stack entries.
   int          _offset;                // The java stack offset
   int          _prepended;             // number of prepended JNI parameters (1 JNIEnv, plus 1 mirror if static)
   int          _jni_offset;            // the current parameter offset, starting with 0
   void do_bool  ()                     { pass_int();    _jni_offset++; _offset++;       }
   void do_char  ()                     { pass_int();    _jni_offset++; _offset++;       }
 #ifdef _LP64
   void do_float ()                     { pass_float();  _jni_offset++; _offset++;       }
   void do_double()                     { pass_double(); _jni_offset++; _offset += 2;    }
 #else
   void do_float ()                     { pass_int();    _jni_offset++; _offset++;       }
   void do_double()                     { pass_double(); _jni_offset += 2; _offset += 2; }
 #endif
   void do_byte  ()                     { pass_int();    _jni_offset++; _offset++;       }
   void do_short ()                     { pass_int();    _jni_offset++; _offset++;       }
   void do_int   ()                     { pass_int();    _jni_offset++; _offset++;       }
 #ifdef _LP64
   void do_long  ()                     { pass_long();   _jni_offset++; _offset += 2;    }
 #else
   void do_long  ()                     { pass_long();   _jni_offset += 2; _offset += 2; }
 #endif
   void do_void  ()                     { ShouldNotReachHere();                               }
   void do_object(int begin, int end)   { pass_object(); _jni_offset++; _offset++;        }
   void do_array (int begin, int end)   { pass_object(); _jni_offset++; _offset++;        }
  public:
   methodHandle method() const          { return _method; }
   int          offset() const          { return _offset; }
   int      jni_offset() const          { return _jni_offset + _prepended; }
 //  int     java_offset() const          { return method()->size_of_parameters() - _offset - 1; }
   bool      is_static() const          { return method()->is_static(); }
   virtual void pass_int()              = 0;
   virtual void pass_long()             = 0;
   virtual void pass_object()           = 0;
 #ifdef _LP64
   virtual void pass_float()            = 0;
   virtual void pass_double()           = 0;
 #else
   virtual void pass_double()           { pass_long(); }  // may be same as long
 #endif
   NativeSignatureIterator(methodHandle method) : SignatureIterator(method->signature()) {
     _method = method;
     _offset = 0;
     _jni_offset = 0;
     const int JNIEnv_words = 1;
     const int mirror_words = 1;
     _prepended = !is_static() ? JNIEnv_words : JNIEnv_words + mirror_words;
   }
   // iterate() calles the 2 virtual methods according to the following invocation syntax:
   //
   // {pass_int | pass_long | pass_object}
   //
   // Arguments are handled from left to right (receiver first, if any).
   // The offset() values refer to the Java stack offsets but are 0 based and increasing.
   // The java_offset() values count down to 0, and refer to the Java TOS.
   // The jni_offset() values increase from 1 or 2, and refer to C arguments.
   void iterate() { iterate(Fingerprinter(method()).fingerprint());
   }
   // Optimized path if we have the bitvector form of signature
   void iterate( uint64_t fingerprint ) {
     if (!is_static()) {
       // handle receiver (not handled by iterate because not in signature)
       pass_object(); _jni_offset++; _offset++;
     }
     SignatureIterator::iterate_parameters( fingerprint );
   }
 };
 // Handy stream for iterating over signature
 class SignatureStream : public StackObj {
  private:
   symbolHandle _signature;
   int          _begin;
   int          _end;
   BasicType    _type;
   bool         _at_return_type;
  public:
   bool at_return_type() const                    { return _at_return_type; }
   bool is_done() const;
   void next_non_primitive(int t);
   void next() {
     symbolOop sig = _signature();
     int len = sig->utf8_length();
     if (_end >= len) {
       _end = len + 1;
       return;
     }
     _begin = _end;
     int t = sig->byte_at(_begin);
     switch (t) {
       case 'B': _type = T_BYTE;    break;
       case 'C': _type = T_CHAR;    break;
       case 'D': _type = T_DOUBLE;  break;
       case 'F': _type = T_FLOAT;   break;
       case 'I': _type = T_INT;     break;
       case 'J': _type = T_LONG;    break;
       case 'S': _type = T_SHORT;   break;
       case 'Z': _type = T_BOOLEAN; break;
       case 'V': _type = T_VOID;    break;
       default : next_non_primitive(t);
                 return;
     }
     _end++;
   }
   SignatureStream(symbolHandle signature,
                   bool is_method = true) :
                    _signature(signature), _at_return_type(false) {
     _begin = _end = (is_method ? 1 : 0);  // skip first '(' in method signatures
     next();
   }
   bool is_object() const;                        // True if this argument is an object
   bool is_array() const;                         // True if this argument is an array
   BasicType type() const                         { return _type; }
   symbolOop as_symbol(TRAPS);
   // return same as_symbol except allocation of new symbols is avoided.
   symbolOop as_symbol_or_null();
 };
 class SignatureVerifier : public StackObj {
   public:
     // Returns true if the symbol is valid method or type signature
     static bool is_valid_signature(symbolHandle sig);
     static bool is_valid_method_signature(symbolHandle sig);
     static bool is_valid_type_signature(symbolHandle sig);
   private:
     static ssize_t is_valid_type(const char*, ssize_t);
     static bool invalid_name_char(char);
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/signature.hpp@98cb887364d3 (annotated)

src/share/vm/runtime/signature.hpp