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 /*

  * Copyright (c) 1998, 2014, 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

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 #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 {

     STRICTER_ACCESS_CTRL_CHECK_VERSION  = 49,

     STACKMAP_ATTRIBUTE_MAJOR_VERSION    = 50,

     INVOKEDYNAMIC_MAJOR_VERSION         = 51,

     NO_RELAX_ACCESS_CTRL_CHECK_VERSION  = 52

   };

   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; ((void)0

 #define CHECK_VERIFY_(verifier, result) \

   CHECK_(result)); if ((verifier)->has_error()) return (result); ((void)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(); }

   bool is_same_or_direct_interface(instanceKlassHandle klass,

     VerificationType klass_type, VerificationType ref_class_type);

  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("%s", _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, ...) ATTRIBUTE_PRINTF(3, 4);

   void class_format_error(const char* fmt, ...) ATTRIBUTE_PRINTF(2, 3);

   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