verifier.hpp revision 1522
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0N/A
0N/A// The verifier class
0N/Aclass Verifier : AllStatic {
0N/A public:
0N/A enum {
0N/A STACKMAP_ATTRIBUTE_MAJOR_VERSION = 50,
0N/A INVOKEDYNAMIC_MAJOR_VERSION = 51
0N/A };
0N/A typedef enum { ThrowException, NoException } Mode;
0N/A
0N/A /**
0N/A * Verify the bytecodes for a class. If 'throw_exception' is true
0N/A * then the appropriate VerifyError or ClassFormatError will be thrown.
0N/A * Otherwise, no exception is thrown and the return indicates the
0N/A * error.
0N/A */
0N/A static bool verify(instanceKlassHandle klass, Mode mode, bool should_verify_class, TRAPS);
0N/A
0N/A // Return false if the class is loaded by the bootstrap loader,
0N/A // or if defineClass was called requesting skipping verification
0N/A // -Xverify:all/none override this value
0N/A static bool should_verify_for(oop class_loader, bool should_verify_class);
0N/A
0N/A // Relax certain verifier checks to enable some broken 1.1 apps to run on 1.2.
0N/A static bool relax_verify_for(oop class_loader);
0N/A
0N/A private:
0N/A static bool is_eligible_for_verification(instanceKlassHandle klass, bool should_verify_class);
0N/A static symbolHandle inference_verify(
0N/A instanceKlassHandle klass, char* msg, size_t msg_len, TRAPS);
0N/A};
0N/A
0N/Aclass RawBytecodeStream;
0N/Aclass StackMapFrame;
0N/Aclass StackMapTable;
0N/A
0N/A// Summary of verifier's memory usage:
0N/A// StackMapTable is stack allocated.
0N/A// StackMapFrame are resource allocated. There is one ResourceMark
0N/A// for each method.
0N/A// There is one mutable StackMapFrame (current_frame) which is updated
0N/A// by abstract bytecode interpretation. frame_in_exception_handler() returns
0N/A// a frame that has a mutable one-item stack (ready for pushing the
0N/A// catch type exception object). All the other StackMapFrame's
0N/A// are immutable (including their locals and stack arrays) after
0N/A// their constructions.
0N/A// locals/stack arrays in StackMapFrame are resource allocated.
0N/A// locals/stack arrays can be shared between StackMapFrame's, except
0N/A// the mutable StackMapFrame (current_frame).
0N/A// Care needs to be taken to make sure resource objects don't outlive
0N/A// the lifetime of their ResourceMark.
0N/A
0N/A// These macros are used similarly to CHECK macros but also check
0N/A// the status of the verifier and return if that has an error.
0N/A#define CHECK_VERIFY(verifier) \
0N/A CHECK); if ((verifier)->has_error()) return; (0
0N/A#define CHECK_VERIFY_(verifier, result) \
0N/A CHECK_(result)); if ((verifier)->has_error()) return (result); (0
0N/A
0N/A// A new instance of this class is created for each class being verified
0N/Aclass ClassVerifier : public StackObj {
0N/A private:
0N/A Thread* _thread;
0N/A symbolHandle _exception_type;
0N/A char* _message;
0N/A size_t _message_buffer_len;
0N/A
0N/A void verify_method(methodHandle method, TRAPS);
0N/A 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
// 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, 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;
}
}