242 lines
9.2 KiB
C++
242 lines
9.2 KiB
C++
/*
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* Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// The verifier class
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class Verifier : AllStatic {
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public:
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enum { STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50 };
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typedef enum { ThrowException, NoException } Mode;
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/**
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* Verify the bytecodes for a class. If 'throw_exception' is true
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* then the appropriate VerifyError or ClassFormatError will be thrown.
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* Otherwise, no exception is thrown and the return indicates the
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* error.
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*/
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static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS);
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// Return false if the class is loaded by the bootstrap loader,
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// or if defineClass was called requesting skipping verification
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// -Xverify:all/none override this value
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static bool should_verify_for(oop class_loader, bool should_verify_class);
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// Relax certain verifier checks to enable some broken 1.1 apps to run on 1.2.
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static bool relax_verify_for(oop class_loader);
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private:
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static bool is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class);
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static symbolHandle inference_verify(
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instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
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};
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class RawBytecodeStream;
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class StackMapFrame;
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class StackMapTable;
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// Summary of verifier's memory usage:
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// StackMapTable is stack allocated.
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// StackMapFrame are resource allocated. There is one ResourceMark
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// for each method.
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// There is one mutable StackMapFrame (current_frame) which is updated
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// by abstract bytecode interpretation. frame_in_exception_handler() returns
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// a frame that has a mutable one-item stack (ready for pushing the
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// catch type exception object). All the other StackMapFrame's
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// are immutable (including their locals and stack arrays) after
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// their constructions.
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// locals/stack arrays in StackMapFrame are resource allocated.
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// locals/stack arrays can be shared between StackMapFrame's, except
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// the mutable StackMapFrame (current_frame).
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// Care needs to be taken to make sure resource objects don't outlive
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// the lifetime of their ResourceMark.
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// These macros are used similarly to CHECK macros but also check
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// the status of the verifier and return if that has an error.
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#define CHECK_VERIFY(verifier) \
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CHECK); if ((verifier)->has_error()) return; (0
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#define CHECK_VERIFY_(verifier, result) \
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CHECK_(result)); if ((verifier)->has_error()) return (result); (0
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// A new instance of this class is created for each class being verified
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class ClassVerifier : public StackObj {
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private:
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Thread* _thread;
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symbolHandle _exception_type;
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char* _message;
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size_t _message_buffer_len;
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void verify_method(methodHandle method, TRAPS);
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char* generate_code_data(methodHandle m, u4 code_length, TRAPS);
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void verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS);
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void verify_local_variable_table(u4 code_length, char* code_data, TRAPS);
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VerificationType cp_ref_index_to_type(
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int index, constantPoolHandle cp, TRAPS) {
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return cp_index_to_type(cp->klass_ref_index_at(index), cp, THREAD);
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}
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bool is_protected_access(
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instanceKlassHandle this_class, klassOop target_class,
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symbolOop field_name, symbolOop field_sig, bool is_method);
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void verify_cp_index(constantPoolHandle cp, int index, TRAPS);
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void verify_cp_type(
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int index, constantPoolHandle cp, unsigned int types, TRAPS);
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void verify_cp_class_type(int index, constantPoolHandle cp, TRAPS);
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u2 verify_stackmap_table(
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u2 stackmap_index, u2 bci, StackMapFrame* current_frame,
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StackMapTable* stackmap_table, bool no_control_flow, TRAPS);
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void verify_exception_handler_targets(
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u2 bci, bool this_uninit, StackMapFrame* current_frame,
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StackMapTable* stackmap_table, TRAPS);
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void verify_ldc(
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int opcode, u2 index, StackMapFrame *current_frame,
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constantPoolHandle cp, u2 bci, TRAPS);
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void verify_switch(
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RawBytecodeStream* bcs, u4 code_length, char* code_data,
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StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS);
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void verify_field_instructions(
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RawBytecodeStream* bcs, StackMapFrame* current_frame,
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constantPoolHandle cp, TRAPS);
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void verify_invoke_init(
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RawBytecodeStream* bcs, VerificationType ref_class_type,
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StackMapFrame* current_frame, u4 code_length, bool* this_uninit,
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constantPoolHandle cp, TRAPS);
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void verify_invoke_instructions(
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RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
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bool* this_uninit, VerificationType return_type,
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constantPoolHandle cp, TRAPS);
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VerificationType get_newarray_type(u2 index, u2 bci, TRAPS);
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void verify_anewarray(
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u2 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS);
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void verify_return_value(
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VerificationType return_type, VerificationType type, u2 offset, TRAPS);
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void verify_iload (u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_lload (u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_fload (u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_dload (u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_aload (u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_istore(u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_astore(u2 index, StackMapFrame* current_frame, TRAPS);
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void verify_iinc (u2 index, StackMapFrame* current_frame, TRAPS);
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bool name_in_supers(symbolOop ref_name, instanceKlassHandle current);
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instanceKlassHandle _klass; // the class being verified
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methodHandle _method; // current method being verified
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VerificationType _this_type; // the verification type of the current class
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public:
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enum {
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BYTECODE_OFFSET = 1,
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NEW_OFFSET = 2
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};
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// constructor
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ClassVerifier(instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
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// destructor
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~ClassVerifier();
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Thread* thread() { return _thread; }
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methodHandle method() { return _method; }
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instanceKlassHandle current_class() const { return _klass; }
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VerificationType current_type() const { return _this_type; }
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// Verifies the class. If a verify or class file format error occurs,
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// the '_exception_name' symbols will set to the exception name and
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// the message_buffer will be filled in with the exception message.
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void verify_class(TRAPS);
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// Return status modes
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symbolHandle result() const { return _exception_type; }
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bool has_error() const { return !(result().is_null()); }
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// Called when verify or class format errors are encountered.
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// May throw an exception based upon the mode.
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void verify_error(u2 offset, const char* fmt, ...);
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void verify_error(const char* fmt, ...);
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void class_format_error(const char* fmt, ...);
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void format_error_message(const char* fmt, int offset, va_list args);
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klassOop load_class(symbolHandle name, TRAPS);
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int change_sig_to_verificationType(
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SignatureStream* sig_type, VerificationType* inference_type, TRAPS);
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VerificationType cp_index_to_type(int index, constantPoolHandle cp, TRAPS) {
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return VerificationType::reference_type(
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symbolHandle(THREAD, cp->klass_name_at(index)));
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}
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static bool _verify_verbose; // for debugging
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};
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inline int ClassVerifier::change_sig_to_verificationType(
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SignatureStream* sig_type, VerificationType* inference_type, TRAPS) {
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BasicType bt = sig_type->type();
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switch (bt) {
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case T_OBJECT:
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case T_ARRAY:
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{
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symbolOop name = sig_type->as_symbol(CHECK_0);
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*inference_type =
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VerificationType::reference_type(symbolHandle(THREAD, name));
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return 1;
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}
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case T_LONG:
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*inference_type = VerificationType::long_type();
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*++inference_type = VerificationType::long2_type();
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return 2;
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case T_DOUBLE:
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*inference_type = VerificationType::double_type();
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*++inference_type = VerificationType::double2_type();
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return 2;
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case T_INT:
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case T_BOOLEAN:
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case T_BYTE:
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case T_CHAR:
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case T_SHORT:
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*inference_type = VerificationType::integer_type();
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return 1;
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case T_FLOAT:
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*inference_type = VerificationType::float_type();
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return 1;
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default:
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ShouldNotReachHere();
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return 1;
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}
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}
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