Mercurial > hg > graal-compiler
view src/share/vm/classfile/verifier.hpp @ 12090:8009adb44523
Merge
author | jmasa |
---|---|
date | Thu, 22 Aug 2013 14:03:47 -0700 |
parents | ef57c43512d6 |
children | 22eaa15b7960 |
line wrap: on
line source
/* * 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 { 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(); } 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