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src/share/vm/classfile/verifier.hpp@a5c9d63a187d (annotated)

src/share/vm/classfile/verifier.hpp

Tue, 20 Jul 2010 08:41:42 -0700

author

apangin

date

Tue, 20 Jul 2010 08:41:42 -0700

changeset 2032

a5c9d63a187d

parent 1957

136b78722a08

child 2297

1070423b51f3

permissions

-rw-r--r--

6964170: Verifier crashes
Summary: Check if klassOop != NULL rather than klass_part != NULL
Reviewed-by: kamg, never

duke@435	1	/*
trims@1907	2	* Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// The verifier class
duke@435	26	class Verifier : AllStatic {
duke@435	27	public:
jrose@1957	28	enum {
jrose@1957	29	STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50,
jrose@1957	30	INVOKEDYNAMIC_MAJOR_VERSION = 51
jrose@1957	31	};
duke@435	32	typedef enum { ThrowException, NoException } Mode;
duke@435	33
duke@435	34	/**
duke@435	35	* Verify the bytecodes for a class. If 'throw_exception' is true
duke@435	36	* then the appropriate VerifyError or ClassFormatError will be thrown.
duke@435	37	* Otherwise, no exception is thrown and the return indicates the
duke@435	38	* error.
duke@435	39	*/
acorn@1408	40	static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS);
duke@435	41
acorn@1408	42	// Return false if the class is loaded by the bootstrap loader,
acorn@1408	43	// or if defineClass was called requesting skipping verification
acorn@1408	44	// -Xverify:all/none override this value
acorn@1408	45	static bool should_verify_for(oop class_loader, bool should_verify_class);
duke@435	46
duke@435	47	// Relax certain verifier checks to enable some broken 1.1 apps to run on 1.2.
duke@435	48	static bool relax_verify_for(oop class_loader);
duke@435	49
duke@435	50	private:
acorn@1408	51	static bool is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class);
duke@435	52	static symbolHandle inference_verify(
duke@435	53	instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
duke@435	54	};
duke@435	55
duke@435	56	class RawBytecodeStream;
duke@435	57	class StackMapFrame;
duke@435	58	class StackMapTable;
duke@435	59
duke@435	60	// Summary of verifier's memory usage:
duke@435	61	// StackMapTable is stack allocated.
duke@435	62	// StackMapFrame are resource allocated. There is one ResourceMark
duke@435	63	// for each method.
duke@435	64	// There is one mutable StackMapFrame (current_frame) which is updated
duke@435	65	// by abstract bytecode interpretation. frame_in_exception_handler() returns
duke@435	66	// a frame that has a mutable one-item stack (ready for pushing the
duke@435	67	// catch type exception object). All the other StackMapFrame's
duke@435	68	// are immutable (including their locals and stack arrays) after
duke@435	69	// their constructions.
duke@435	70	// locals/stack arrays in StackMapFrame are resource allocated.
duke@435	71	// locals/stack arrays can be shared between StackMapFrame's, except
duke@435	72	// the mutable StackMapFrame (current_frame).
duke@435	73	// Care needs to be taken to make sure resource objects don't outlive
duke@435	74	// the lifetime of their ResourceMark.
duke@435	75
duke@435	76	// These macros are used similarly to CHECK macros but also check
duke@435	77	// the status of the verifier and return if that has an error.
duke@435	78	#define CHECK_VERIFY(verifier) \
duke@435	79	CHECK); if ((verifier)->has_error()) return; (0
duke@435	80	#define CHECK_VERIFY_(verifier, result) \
duke@435	81	CHECK_(result)); if ((verifier)->has_error()) return (result); (0
duke@435	82
duke@435	83	// A new instance of this class is created for each class being verified
duke@435	84	class ClassVerifier : public StackObj {
duke@435	85	private:
duke@435	86	Thread* _thread;
duke@435	87	symbolHandle _exception_type;
duke@435	88	char* _message;
duke@435	89	size_t _message_buffer_len;
duke@435	90
duke@435	91	void verify_method(methodHandle method, TRAPS);
duke@435	92	char* generate_code_data(methodHandle m, u4 code_length, TRAPS);
duke@435	93	void verify_exception_handler_table(u4 code_length, char* code_data, int& min, int& max, TRAPS);
duke@435	94	void verify_local_variable_table(u4 code_length, char* code_data, TRAPS);
duke@435	95
duke@435	96	VerificationType cp_ref_index_to_type(
duke@435	97	int index, constantPoolHandle cp, TRAPS) {
duke@435	98	return cp_index_to_type(cp->klass_ref_index_at(index), cp, THREAD);
duke@435	99	}
duke@435	100
duke@435	101	bool is_protected_access(
duke@435	102	instanceKlassHandle this_class, klassOop target_class,
duke@435	103	symbolOop field_name, symbolOop field_sig, bool is_method);
duke@435	104
duke@435	105	void verify_cp_index(constantPoolHandle cp, int index, TRAPS);
duke@435	106	void verify_cp_type(
duke@435	107	int index, constantPoolHandle cp, unsigned int types, TRAPS);
duke@435	108	void verify_cp_class_type(int index, constantPoolHandle cp, TRAPS);
duke@435	109
duke@435	110	u2 verify_stackmap_table(
duke@435	111	u2 stackmap_index, u2 bci, StackMapFrame* current_frame,
duke@435	112	StackMapTable* stackmap_table, bool no_control_flow, TRAPS);
duke@435	113
duke@435	114	void verify_exception_handler_targets(
duke@435	115	u2 bci, bool this_uninit, StackMapFrame* current_frame,
duke@435	116	StackMapTable* stackmap_table, TRAPS);
duke@435	117
duke@435	118	void verify_ldc(
duke@435	119	int opcode, u2 index, StackMapFrame *current_frame,
duke@435	120	constantPoolHandle cp, u2 bci, TRAPS);
duke@435	121
duke@435	122	void verify_switch(
duke@435	123	RawBytecodeStream* bcs, u4 code_length, char* code_data,
duke@435	124	StackMapFrame* current_frame, StackMapTable* stackmap_table, TRAPS);
duke@435	125
duke@435	126	void verify_field_instructions(
duke@435	127	RawBytecodeStream* bcs, StackMapFrame* current_frame,
duke@435	128	constantPoolHandle cp, TRAPS);
duke@435	129
duke@435	130	void verify_invoke_init(
duke@435	131	RawBytecodeStream* bcs, VerificationType ref_class_type,
duke@435	132	StackMapFrame* current_frame, u4 code_length, bool* this_uninit,
duke@435	133	constantPoolHandle cp, TRAPS);
duke@435	134
duke@435	135	void verify_invoke_instructions(
duke@435	136	RawBytecodeStream* bcs, u4 code_length, StackMapFrame* current_frame,
duke@435	137	bool* this_uninit, VerificationType return_type,
duke@435	138	constantPoolHandle cp, TRAPS);
duke@435	139
duke@435	140	VerificationType get_newarray_type(u2 index, u2 bci, TRAPS);
duke@435	141	void verify_anewarray(
duke@435	142	u2 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS);
duke@435	143	void verify_return_value(
duke@435	144	VerificationType return_type, VerificationType type, u2 offset, TRAPS);
duke@435	145
duke@435	146	void verify_iload (u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	147	void verify_lload (u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	148	void verify_fload (u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	149	void verify_dload (u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	150	void verify_aload (u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	151	void verify_istore(u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	152	void verify_lstore(u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	153	void verify_fstore(u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	154	void verify_dstore(u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	155	void verify_astore(u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	156	void verify_iinc (u2 index, StackMapFrame* current_frame, TRAPS);
duke@435	157
duke@435	158	bool name_in_supers(symbolOop ref_name, instanceKlassHandle current);
duke@435	159
duke@435	160	instanceKlassHandle _klass; // the class being verified
duke@435	161	methodHandle _method; // current method being verified
duke@435	162	VerificationType _this_type; // the verification type of the current class
duke@435	163
jrose@1925	164	// Some recursive calls from the verifier to the name resolver
jrose@1925	165	// can cause the current class to be re-verified and rewritten.
jrose@1925	166	// If this happens, the original verification should not continue,
jrose@1925	167	// because constant pool indexes will have changed.
jrose@1925	168	// The rewriter is preceded by the verifier. If the verifier throws
jrose@1925	169	// an error, rewriting is prevented. Also, rewriting always precedes
jrose@1925	170	// bytecode execution or compilation. Thus, is_rewritten implies
jrose@1925	171	// that a class has been verified and prepared for execution.
jrose@1925	172	bool was_recursively_verified() { return _klass->is_rewritten(); }
jrose@1925	173
duke@435	174	public:
duke@435	175	enum {
duke@435	176	BYTECODE_OFFSET = 1,
duke@435	177	NEW_OFFSET = 2
duke@435	178	};
duke@435	179
duke@435	180	// constructor
duke@435	181	ClassVerifier(instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
duke@435	182
duke@435	183	// destructor
duke@435	184	~ClassVerifier();
duke@435	185
duke@435	186	Thread* thread() { return _thread; }
duke@435	187	methodHandle method() { return _method; }
duke@435	188	instanceKlassHandle current_class() const { return _klass; }
duke@435	189	VerificationType current_type() const { return _this_type; }
duke@435	190
duke@435	191	// Verifies the class. If a verify or class file format error occurs,
duke@435	192	// the '_exception_name' symbols will set to the exception name and
duke@435	193	// the message_buffer will be filled in with the exception message.
duke@435	194	void verify_class(TRAPS);
duke@435	195
duke@435	196	// Return status modes
duke@435	197	symbolHandle result() const { return _exception_type; }
duke@435	198	bool has_error() const { return !(result().is_null()); }
duke@435	199
duke@435	200	// Called when verify or class format errors are encountered.
duke@435	201	// May throw an exception based upon the mode.
duke@435	202	void verify_error(u2 offset, const char* fmt, ...);
duke@435	203	void verify_error(const char* fmt, ...);
duke@435	204	void class_format_error(const char* fmt, ...);
duke@435	205	void format_error_message(const char* fmt, int offset, va_list args);
duke@435	206
duke@435	207	klassOop load_class(symbolHandle name, TRAPS);
duke@435	208
duke@435	209	int change_sig_to_verificationType(
duke@435	210	SignatureStream* sig_type, VerificationType* inference_type, TRAPS);
duke@435	211
duke@435	212	VerificationType cp_index_to_type(int index, constantPoolHandle cp, TRAPS) {
duke@435	213	return VerificationType::reference_type(
duke@435	214	symbolHandle(THREAD, cp->klass_name_at(index)));
duke@435	215	}
duke@435	216
duke@435	217	static bool _verify_verbose; // for debugging
duke@435	218	};
duke@435	219
duke@435	220	inline int ClassVerifier::change_sig_to_verificationType(
duke@435	221	SignatureStream* sig_type, VerificationType* inference_type, TRAPS) {
duke@435	222	BasicType bt = sig_type->type();
duke@435	223	switch (bt) {
duke@435	224	case T_OBJECT:
duke@435	225	case T_ARRAY:
duke@435	226	{
duke@435	227	symbolOop name = sig_type->as_symbol(CHECK_0);
duke@435	228	*inference_type =
duke@435	229	VerificationType::reference_type(symbolHandle(THREAD, name));
duke@435	230	return 1;
duke@435	231	}
duke@435	232	case T_LONG:
duke@435	233	*inference_type = VerificationType::long_type();
duke@435	234	*++inference_type = VerificationType::long2_type();
duke@435	235	return 2;
duke@435	236	case T_DOUBLE:
duke@435	237	*inference_type = VerificationType::double_type();
duke@435	238	*++inference_type = VerificationType::double2_type();
duke@435	239	return 2;
duke@435	240	case T_INT:
duke@435	241	case T_BOOLEAN:
duke@435	242	case T_BYTE:
duke@435	243	case T_CHAR:
duke@435	244	case T_SHORT:
duke@435	245	*inference_type = VerificationType::integer_type();
duke@435	246	return 1;
duke@435	247	case T_FLOAT:
duke@435	248	*inference_type = VerificationType::float_type();
duke@435	249	return 1;
duke@435	250	default:
duke@435	251	ShouldNotReachHere();
duke@435	252	return 1;
duke@435	253	}
duke@435	254	}