jdk8-mips64-public/hotspot: src/share/vm/classfile/verifier.hpp@95c00927be11 (annotated)

src/share/vm/classfile/verifier.hpp@95c00927be11 (annotated)

src/share/vm/classfile/verifier.hpp

Mon, 27 May 2013 12:56:34 +0200

author: stefank
date: Mon, 27 May 2013 12:56:34 +0200
changeset 5195: 95c00927be11
parent 5097: 92ef81e2f571
child 5213: 4552a7633a07
permissions: -rw-r--r--

8015428: Remove unused CDS support from StringTable
Summary: The string in StringTable is not used by CDS anymore. Remove the unnecessary code in preparation for 8015422: Large performance hit when the StringTable is walked twice in Parallel Scavenge
Reviewed-by: pliden, tschatzl, coleenp

 /*
  * Copyright (c) 1998, 2013, 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.
  *
  * 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.
  *
  */
 #ifndef SHARE_VM_CLASSFILE_VERIFIER_HPP
 #define SHARE_VM_CLASSFILE_VERIFIER_HPP
 #include "classfile/verificationType.hpp"
 #include "memory/gcLocker.hpp"
 #include "oops/klass.hpp"
 #include "oops/method.hpp"
 #include "runtime/handles.hpp"
 #include "utilities/exceptions.hpp"
 // The verifier class
 class Verifier : AllStatic {
  public:
   enum {
     STACKMAP_ATTRIBUTE_MAJOR_VERSION    = 50,
     INVOKEDYNAMIC_MAJOR_VERSION         = 51
   };
   typedef enum { ThrowException, NoException } Mode;
   /**
    * Verify the bytecodes for a class.  If 'throw_exception' is true
    * then the appropriate VerifyError or ClassFormatError will be thrown.
    * Otherwise, no exception is thrown and the return indicates the
    * error.
    */
   static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS);
   // Return false if the class is loaded by the bootstrap loader,
   // or if defineClass was called requesting skipping verification
   // -Xverify:all/none override this value
   static bool should_verify_for(oop class_loader, bool should_verify_class);
   // Relax certain verifier checks to enable some broken 1.1 apps to run on 1.2.
   static bool relax_verify_for(oop class_loader);
  private:
   static bool is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class);
   static Symbol* inference_verify(
     instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
 };
 class RawBytecodeStream;
 class StackMapFrame;
 class StackMapTable;
 // Summary of verifier's memory usage:
 // StackMapTable is stack allocated.
 // StackMapFrame are resource allocated. There is only one ResourceMark
 // for each class verification, which is created at the top level.
 // There is one mutable StackMapFrame (current_frame) which is updated
 // by abstract bytecode interpretation. frame_in_exception_handler() returns
 // a frame that has a mutable one-item stack (ready for pushing the
 // catch type exception object). All the other StackMapFrame's
 // are immutable (including their locals and stack arrays) after
 // their constructions.
 // locals/stack arrays in StackMapFrame are resource allocated.
 // locals/stack arrays can be shared between StackMapFrame's, except
 // the mutable StackMapFrame (current_frame).
 // These macros are used similarly to CHECK macros but also check
 // the status of the verifier and return if that has an error.
 #define CHECK_VERIFY(verifier) \
   CHECK); if ((verifier)->has_error()) return; (0
 #define CHECK_VERIFY_(verifier, result) \
   CHECK_(result)); if ((verifier)->has_error()) return (result); (0
 class TypeOrigin VALUE_OBJ_CLASS_SPEC {
  private:
   typedef enum {
     CF_LOCALS,  // Comes from the current frame locals
     CF_STACK,   // Comes from the current frame expression stack
     SM_LOCALS,  // Comes from stackmap locals
     SM_STACK,   // Comes from stackmap expression stack
     CONST_POOL, // Comes from the constant pool
     SIG,        // Comes from method signature
     IMPLICIT,   // Comes implicitly from code or context
     BAD_INDEX,  // No type, but the index is bad
     FRAME_ONLY, // No type, context just contains the frame
     NONE
   } Origin;
   Origin _origin;
   u2 _index;              // local, stack, or constant pool index
   StackMapFrame* _frame;  // source frame if CF or SM
   VerificationType _type; // The actual type
   TypeOrigin(
       Origin origin, u2 index, StackMapFrame* frame, VerificationType type)
       : _origin(origin), _index(index), _frame(frame), _type(type) {}
  public:
   TypeOrigin() : _origin(NONE), _index(0), _frame(NULL) {}
   static TypeOrigin null();
   static TypeOrigin local(u2 index, StackMapFrame* frame);
   static TypeOrigin stack(u2 index, StackMapFrame* frame);
   static TypeOrigin sm_local(u2 index, StackMapFrame* frame);
   static TypeOrigin sm_stack(u2 index, StackMapFrame* frame);
   static TypeOrigin cp(u2 index, VerificationType vt);
   static TypeOrigin signature(VerificationType vt);
   static TypeOrigin bad_index(u2 index);
   static TypeOrigin implicit(VerificationType t);
   static TypeOrigin frame(StackMapFrame* frame);
   void reset_frame();
   void details(outputStream* ss) const;
   void print_frame(outputStream* ss) const;
   const StackMapFrame* frame() const { return _frame; }
   bool is_valid() const { return _origin != NONE; }
   u2 index() const { return _index; }
 #ifdef ASSERT
   void print_on(outputStream* str) const;
 #endif
 };
 class ErrorContext VALUE_OBJ_CLASS_SPEC {
  private:
   typedef enum {
     INVALID_BYTECODE,     // There was a problem with the bytecode
     WRONG_TYPE,           // Type value was not as expected
     FLAGS_MISMATCH,       // Frame flags are not assignable
     BAD_CP_INDEX,         // Invalid constant pool index
     BAD_LOCAL_INDEX,      // Invalid local index
     LOCALS_SIZE_MISMATCH, // Frames have differing local counts
     STACK_SIZE_MISMATCH,  // Frames have different stack sizes
     STACK_OVERFLOW,       // Attempt to push onto a full expression stack
     STACK_UNDERFLOW,      // Attempt to pop and empty expression stack
     MISSING_STACKMAP,     // No stackmap for this location and there should be
     BAD_STACKMAP,         // Format error in stackmap
     NO_FAULT,             // No error
     UNKNOWN
   } FaultType;
   int _bci;
   FaultType _fault;
   TypeOrigin _type;
   TypeOrigin _expected;
   ErrorContext(int bci, FaultType fault) :
       _bci(bci), _fault(fault)  {}
   ErrorContext(int bci, FaultType fault, TypeOrigin type) :
       _bci(bci), _fault(fault), _type(type)  {}
   ErrorContext(int bci, FaultType fault, TypeOrigin type, TypeOrigin exp) :
       _bci(bci), _fault(fault), _type(type), _expected(exp)  {}
  public:
   ErrorContext() : _bci(-1), _fault(NO_FAULT) {}
   static ErrorContext bad_code(u2 bci) {
     return ErrorContext(bci, INVALID_BYTECODE);
   }
   static ErrorContext bad_type(u2 bci, TypeOrigin type) {
     return ErrorContext(bci, WRONG_TYPE, type);
   }
   static ErrorContext bad_type(u2 bci, TypeOrigin type, TypeOrigin exp) {
     return ErrorContext(bci, WRONG_TYPE, type, exp);
   }
   static ErrorContext bad_flags(u2 bci, StackMapFrame* frame) {
     return ErrorContext(bci, FLAGS_MISMATCH, TypeOrigin::frame(frame));
   }
   static ErrorContext bad_flags(u2 bci, StackMapFrame* cur, StackMapFrame* sm) {
     return ErrorContext(bci, FLAGS_MISMATCH,
                         TypeOrigin::frame(cur), TypeOrigin::frame(sm));
   }
   static ErrorContext bad_cp_index(u2 bci, u2 index) {
     return ErrorContext(bci, BAD_CP_INDEX, TypeOrigin::bad_index(index));
   }
   static ErrorContext bad_local_index(u2 bci, u2 index) {
     return ErrorContext(bci, BAD_LOCAL_INDEX, TypeOrigin::bad_index(index));
   }
   static ErrorContext locals_size_mismatch(
       u2 bci, StackMapFrame* frame0, StackMapFrame* frame1) {
     return ErrorContext(bci, LOCALS_SIZE_MISMATCH,
         TypeOrigin::frame(frame0), TypeOrigin::frame(frame1));
   }
   static ErrorContext stack_size_mismatch(
       u2 bci, StackMapFrame* frame0, StackMapFrame* frame1) {
     return ErrorContext(bci, STACK_SIZE_MISMATCH,
         TypeOrigin::frame(frame0), TypeOrigin::frame(frame1));
   }
   static ErrorContext stack_overflow(u2 bci, StackMapFrame* frame) {
     return ErrorContext(bci, STACK_OVERFLOW, TypeOrigin::frame(frame));
   }
   static ErrorContext stack_underflow(u2 bci, StackMapFrame* frame) {
     return ErrorContext(bci, STACK_UNDERFLOW, TypeOrigin::frame(frame));
   }
   static ErrorContext missing_stackmap(u2 bci) {
     return ErrorContext(bci, MISSING_STACKMAP);
   }
   static ErrorContext bad_stackmap(int index, StackMapFrame* frame) {
     return ErrorContext(0, BAD_STACKMAP, TypeOrigin::frame(frame));
   }
   bool is_valid() const { return _fault != NO_FAULT; }
   int bci() const { return _bci; }
   void reset_frames() {
     _type.reset_frame();
     _expected.reset_frame();
   }
   void details(outputStream* ss, const Method* method) const;
 #ifdef ASSERT
   void print_on(outputStream* str) const {
     str->print("error_context(%d, %d,", _bci, _fault);
     _type.print_on(str);
     str->print(",");
     _expected.print_on(str);
     str->print(")");
   }
 #endif
  private:
   void location_details(outputStream* ss, const Method* method) const;
   void reason_details(outputStream* ss) const;
   void frame_details(outputStream* ss) const;
   void bytecode_details(outputStream* ss, const Method* method) const;
   void handler_details(outputStream* ss, const Method* method) const;
   void stackmap_details(outputStream* ss, const Method* method) const;
 };
 // A new instance of this class is created for each class being verified
 class ClassVerifier : public StackObj {
  private:
   Thread* _thread;
   GrowableArray<Symbol*>* _symbols;  // keep a list of symbols created
   Symbol* _exception_type;
   char* _message;
   ErrorContext _error_context;  // contains information about an error
   void verify_method(methodHandle method, TRAPS);
   char* generate_code_data(methodHandle m, u4 code_length, TRAPS);
   void verify_exception_handler_table(u4 code_length, char* code_data,
                                       int& min, int& max, TRAPS);
   void verify_local_variable_table(u4 code_length, char* code_data, TRAPS);
   VerificationType cp_ref_index_to_type(
       int index, constantPoolHandle cp, TRAPS) {
     return cp_index_to_type(cp->klass_ref_index_at(index), cp, THREAD);
   }
   bool is_protected_access(
     instanceKlassHandle this_class, Klass* target_class,
     Symbol* field_name, Symbol* field_sig, bool is_method);
   void verify_cp_index(u2 bci, constantPoolHandle cp, int index, TRAPS);
   void verify_cp_type(u2 bci, int index, constantPoolHandle cp,
       unsigned int types, TRAPS);
   void verify_cp_class_type(u2 bci, int index, constantPoolHandle cp, TRAPS);
   u2 verify_stackmap_table(
     u2 stackmap_index, u2 bci, StackMapFrame* current_frame,
     StackMapTable* stackmap_table, bool no_control_flow, TRAPS);
   void verify_exception_handler_targets(
     u2 bci, bool this_uninit, StackMapFrame* current_frame,
     StackMapTable* stackmap_table, TRAPS);
   void verify_ldc(
     int opcode, u2 index, StackMapFrame *current_frame,
     constantPoolHandle cp, u2 bci, TRAPS);
   void verify_switch(
     RawBytecodeStream* bcs, u4 code_length, char* code_data,
     StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS);
   void verify_field_instructions(
     RawBytecodeStream* bcs, StackMapFrame* current_frame,
     constantPoolHandle cp, TRAPS);
   void verify_invoke_init(
     RawBytecodeStream* bcs, u2 ref_index, VerificationType ref_class_type,
     StackMapFrame* current_frame, u4 code_length, bool* this_uninit,
     constantPoolHandle cp, TRAPS);
   void verify_invoke_instructions(
     RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
     bool* this_uninit, VerificationType return_type,
     constantPoolHandle cp, TRAPS);
   VerificationType get_newarray_type(u2 index, u2 bci, TRAPS);
   void verify_anewarray(u2 bci, u2 index, constantPoolHandle cp,
       StackMapFrame* current_frame, TRAPS);
   void verify_return_value(
       VerificationType return_type, VerificationType type, u2 offset,
       StackMapFrame* current_frame, TRAPS);
   void verify_iload (u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_lload (u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_fload (u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_dload (u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_aload (u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_istore(u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_astore(u2 index, StackMapFrame* current_frame, TRAPS);
   void verify_iinc  (u2 index, StackMapFrame* current_frame, TRAPS);
   bool name_in_supers(Symbol* ref_name, instanceKlassHandle current);
   VerificationType object_type() const;
   instanceKlassHandle _klass;  // the class being verified
   methodHandle        _method; // current method being verified
   VerificationType    _this_type; // the verification type of the current class
   // Some recursive calls from the verifier to the name resolver
   // can cause the current class to be re-verified and rewritten.
   // If this happens, the original verification should not continue,
   // because constant pool indexes will have changed.
   // The rewriter is preceded by the verifier.  If the verifier throws
   // an error, rewriting is prevented.  Also, rewriting always precedes
   // bytecode execution or compilation.  Thus, is_rewritten implies
   // that a class has been verified and prepared for execution.
   bool was_recursively_verified() { return _klass->is_rewritten(); }
  public:
   enum {
     BYTECODE_OFFSET = 1,
     NEW_OFFSET = 2
   };
   // constructor
   ClassVerifier(instanceKlassHandle klass, TRAPS);
   // destructor
   ~ClassVerifier();
   Thread* thread()             { return _thread; }
   methodHandle method()        { return _method; }
   instanceKlassHandle current_class() const { return _klass; }
   VerificationType current_type() const { return _this_type; }
   // Verifies the class.  If a verify or class file format error occurs,
   // the '_exception_name' symbols will set to the exception name and
   // the message_buffer will be filled in with the exception message.
   void verify_class(TRAPS);
   // Return status modes
   Symbol* result() const { return _exception_type; }
   bool has_error() const { return result() != NULL; }
   char* exception_message() {
     stringStream ss;
     ss.print(_message);
     _error_context.details(&ss, _method());
     return ss.as_string();
   }
   // Called when verify or class format errors are encountered.
   // May throw an exception based upon the mode.
   void verify_error(ErrorContext ctx, const char* fmt, ...);
   void class_format_error(const char* fmt, ...);
   Klass* load_class(Symbol* name, TRAPS);
   int change_sig_to_verificationType(
     SignatureStream* sig_type, VerificationType* inference_type, TRAPS);
   VerificationType cp_index_to_type(int index, constantPoolHandle cp, TRAPS) {
     return VerificationType::reference_type(cp->klass_name_at(index));
   }
   // Keep a list of temporary symbols created during verification because
   // their reference counts need to be decrememented when the verifier object
   // goes out of scope.  Since these symbols escape the scope in which they're
   // created, we can't use a TempNewSymbol.
   Symbol* create_temporary_symbol(
       const Symbol* s, int begin, int end, TRAPS);
   Symbol* create_temporary_symbol(const char *s, int length, TRAPS);
   TypeOrigin ref_ctx(const char* str, TRAPS);
 };
 inline int ClassVerifier::change_sig_to_verificationType(
     SignatureStream* sig_type, VerificationType* inference_type, TRAPS) {
   BasicType bt = sig_type->type();
   switch (bt) {
     case T_OBJECT:
     case T_ARRAY:
       {
         Symbol* name = sig_type->as_symbol(CHECK_0);
         // Create another symbol to save as signature stream unreferences
         // this symbol.
         Symbol* name_copy =
           create_temporary_symbol(name, 0, name->utf8_length(), CHECK_0);
         assert(name_copy == name, "symbols don't match");
         *inference_type =
           VerificationType::reference_type(name_copy);
         return 1;
       }
     case T_LONG:
       *inference_type = VerificationType::long_type();
       *++inference_type = VerificationType::long2_type();
       return 2;
     case T_DOUBLE:
       *inference_type = VerificationType::double_type();
       *++inference_type = VerificationType::double2_type();
       return 2;
     case T_INT:
     case T_BOOLEAN:
     case T_BYTE:
     case T_CHAR:
     case T_SHORT:
       *inference_type = VerificationType::integer_type();
       return 1;
     case T_FLOAT:
       *inference_type = VerificationType::float_type();
       return 1;
     default:
       ShouldNotReachHere();
       return 1;
   }
 }
 #endif // SHARE_VM_CLASSFILE_VERIFIER_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/verifier.hpp@95c00927be11 (annotated)

src/share/vm/classfile/verifier.hpp