--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/classfile/verifier.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,239 @@
+/*
+ * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// The verifier class
+class Verifier : AllStatic {
+ public:
+ enum { STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50 };
+ 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, TRAPS);
+
+ // Return false if the class is loaded by the bootstrap loader.
+ static bool should_verify_for(oop class_loader);
+
+ // 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);
+ static symbolHandle 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 one ResourceMark
+// for each method.
+// 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).
+// Care needs to be taken to make sure resource objects don't outlive
+// the lifetime of their ResourceMark.
+
+// 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
+
+// A new instance of this class is created for each class being verified
+class ClassVerifier : public StackObj {
+ private:
+ Thread* _thread;
+ symbolHandle _exception_type;
+ char* _message;
+ size_t _message_buffer_len;
+
+ 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, klassOop target_class,
+ symbolOop field_name, symbolOop field_sig, bool is_method);
+
+ void verify_cp_index(constantPoolHandle cp, int index, TRAPS);
+ void verify_cp_type(
+ int index, constantPoolHandle cp, unsigned int types, TRAPS);
+ void verify_cp_class_type(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, 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 index, constantPoolHandle cp, StackMapFrame* current_frame, TRAPS);
+ void verify_return_value(
+ VerificationType return_type, VerificationType type, u2 offset, 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(symbolOop ref_name, instanceKlassHandle current);
+
+ instanceKlassHandle _klass; // the class being verified
+ methodHandle _method; // current method being verified
+ VerificationType _this_type; // the verification type of the current class
+
+ public:
+ enum {
+ BYTECODE_OFFSET = 1,
+ NEW_OFFSET = 2
+ };
+
+ // constructor
+ ClassVerifier(instanceKlassHandle klass, char* msg, size_t msg_len, 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
+ symbolHandle result() const { return _exception_type; }
+ bool has_error() const { return !(result().is_null()); }
+
+ // Called when verify or class format errors are encountered.
+ // May throw an exception based upon the mode.
+ void verify_error(u2 offset, const char* fmt, ...);
+ void verify_error(const char* fmt, ...);
+ void class_format_error(const char* fmt, ...);
+ void format_error_message(const char* fmt, int offset, va_list args);
+
+ klassOop load_class(symbolHandle 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(
+ symbolHandle(THREAD, cp->klass_name_at(index)));
+ }
+
+ static bool _verify_verbose; // for debugging
+};
+
+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:
+ {
+ symbolOop name = sig_type->as_symbol(CHECK_0);
+ *inference_type =
+ VerificationType::reference_type(symbolHandle(THREAD, name));
+ 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;
+ }
+}