| /* |
| * Copyright 2003-2006 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. |
| * |
| */ |
| |
| # include "incls/_precompiled.incl" |
| # include "incls/_stackMapFrame.cpp.incl" |
| |
| StackMapFrame::StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* v) : |
| _offset(0), _locals_size(0), _stack_size(0), _flags(0), |
| _max_locals(max_locals), _max_stack(max_stack), |
| _verifier(v) { |
| Thread* thr = v->thread(); |
| _locals = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, max_locals); |
| _stack = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, max_stack); |
| int32_t i; |
| for(i = 0; i < max_locals; i++) { |
| _locals[i] = VerificationType::bogus_type(); |
| } |
| for(i = 0; i < max_stack; i++) { |
| _stack[i] = VerificationType::bogus_type(); |
| } |
| } |
| |
| StackMapFrame* StackMapFrame::frame_in_exception_handler(u1 flags) { |
| Thread* thr = _verifier->thread(); |
| VerificationType* stack = NEW_RESOURCE_ARRAY_IN_THREAD(thr, VerificationType, 1); |
| StackMapFrame* frame = new StackMapFrame(_offset, flags, _locals_size, 0, _max_locals, _max_stack, _locals, stack, _verifier); |
| return frame; |
| } |
| |
| bool StackMapFrame::has_new_object() const { |
| int32_t i; |
| for (i = 0; i < _max_locals; i++) { |
| if (_locals[i].is_uninitialized()) { |
| return true; |
| } |
| } |
| for (i = 0; i < _stack_size; i++) { |
| if (_stack[i].is_uninitialized()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void StackMapFrame::initialize_object( |
| VerificationType old_object, VerificationType new_object) { |
| int32_t i; |
| for (i = 0; i < _max_locals; i++) { |
| if (_locals[i].equals(old_object)) { |
| _locals[i] = new_object; |
| } |
| } |
| for (i = 0; i < _stack_size; i++) { |
| if (_stack[i].equals(old_object)) { |
| _stack[i] = new_object; |
| } |
| } |
| if (old_object == VerificationType::uninitialized_this_type()) { |
| // "this" has been initialized - reset flags |
| _flags = 0; |
| } |
| } |
| |
| VerificationType StackMapFrame::set_locals_from_arg( |
| const methodHandle m, VerificationType thisKlass, TRAPS) { |
| symbolHandle signature(THREAD, m->signature()); |
| SignatureStream ss(signature); |
| int init_local_num = 0; |
| if (!m->is_static()) { |
| init_local_num++; |
| // add one extra argument for instance method |
| if (m->name() == vmSymbols::object_initializer_name() && |
| thisKlass.name() != vmSymbols::java_lang_Object()) { |
| _locals[0] = VerificationType::uninitialized_this_type(); |
| _flags |= FLAG_THIS_UNINIT; |
| } else { |
| _locals[0] = thisKlass; |
| } |
| } |
| |
| // local num may be greater than size of parameters because long/double occupies two slots |
| while(!ss.at_return_type()) { |
| init_local_num += _verifier->change_sig_to_verificationType( |
| &ss, &_locals[init_local_num], |
| CHECK_VERIFY_(verifier(), VerificationType::bogus_type())); |
| ss.next(); |
| } |
| _locals_size = init_local_num; |
| |
| switch (ss.type()) { |
| case T_OBJECT: |
| case T_ARRAY: |
| { |
| symbolOop sig = ss.as_symbol(CHECK_(VerificationType::bogus_type())); |
| return VerificationType::reference_type(symbolHandle(THREAD, sig)); |
| } |
| case T_INT: return VerificationType::integer_type(); |
| case T_BYTE: return VerificationType::byte_type(); |
| case T_CHAR: return VerificationType::char_type(); |
| case T_SHORT: return VerificationType::short_type(); |
| case T_BOOLEAN: return VerificationType::boolean_type(); |
| case T_FLOAT: return VerificationType::float_type(); |
| case T_DOUBLE: return VerificationType::double_type(); |
| case T_LONG: return VerificationType::long_type(); |
| case T_VOID: return VerificationType::bogus_type(); |
| default: |
| ShouldNotReachHere(); |
| } |
| return VerificationType::bogus_type(); |
| } |
| |
| void StackMapFrame::copy_locals(const StackMapFrame* src) { |
| int32_t len = src->locals_size() < _locals_size ? |
| src->locals_size() : _locals_size; |
| for (int32_t i = 0; i < len; i++) { |
| _locals[i] = src->locals()[i]; |
| } |
| } |
| |
| void StackMapFrame::copy_stack(const StackMapFrame* src) { |
| int32_t len = src->stack_size() < _stack_size ? |
| src->stack_size() : _stack_size; |
| for (int32_t i = 0; i < len; i++) { |
| _stack[i] = src->stack()[i]; |
| } |
| } |
| |
| |
| bool StackMapFrame::is_assignable_to( |
| VerificationType* from, VerificationType* to, int32_t len, TRAPS) const { |
| for (int32_t i = 0; i < len; i++) { |
| bool subtype = to[i].is_assignable_from( |
| from[i], verifier()->current_class(), THREAD); |
| if (!subtype) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool StackMapFrame::is_assignable_to(const StackMapFrame* target, TRAPS) const { |
| if (_max_locals != target->max_locals() || _stack_size != target->stack_size()) { |
| return false; |
| } |
| // Only need to compare type elements up to target->locals() or target->stack(). |
| // The remaining type elements in this state can be ignored because they are |
| // assignable to bogus type. |
| bool match_locals = is_assignable_to( |
| _locals, target->locals(), target->locals_size(), CHECK_false); |
| bool match_stack = is_assignable_to( |
| _stack, target->stack(), _stack_size, CHECK_false); |
| bool match_flags = (_flags | target->flags()) == target->flags(); |
| return (match_locals && match_stack && match_flags); |
| } |
| |
| VerificationType StackMapFrame::pop_stack_ex(VerificationType type, TRAPS) { |
| if (_stack_size <= 0) { |
| verifier()->verify_error(_offset, "Operand stack underflow"); |
| return VerificationType::bogus_type(); |
| } |
| VerificationType top = _stack[--_stack_size]; |
| bool subtype = type.is_assignable_from( |
| top, verifier()->current_class(), CHECK_(VerificationType::bogus_type())); |
| if (!subtype) { |
| verifier()->verify_error(_offset, "Bad type on operand stack"); |
| return VerificationType::bogus_type(); |
| } |
| NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); ) |
| return top; |
| } |
| |
| VerificationType StackMapFrame::get_local( |
| int32_t index, VerificationType type, TRAPS) { |
| if (index >= _max_locals) { |
| verifier()->verify_error(_offset, "Local variable table overflow"); |
| return VerificationType::bogus_type(); |
| } |
| bool subtype = type.is_assignable_from(_locals[index], |
| verifier()->current_class(), CHECK_(VerificationType::bogus_type())); |
| if (!subtype) { |
| verifier()->verify_error(_offset, "Bad local variable type"); |
| return VerificationType::bogus_type(); |
| } |
| if(index >= _locals_size) { _locals_size = index + 1; } |
| return _locals[index]; |
| } |
| |
| void StackMapFrame::get_local_2( |
| int32_t index, VerificationType type1, VerificationType type2, TRAPS) { |
| assert(type1.is_long() || type1.is_double(), "must be long/double"); |
| assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); |
| if (index >= _locals_size - 1) { |
| verifier()->verify_error(_offset, "get long/double overflows locals"); |
| return; |
| } |
| bool subtype1 = type1.is_assignable_from( |
| _locals[index], verifier()->current_class(), CHECK); |
| bool subtype2 = type2.is_assignable_from( |
| _locals[index+1], verifier()->current_class(), CHECK); |
| if (!subtype1 || !subtype2) { |
| verifier()->verify_error(_offset, "Bad local variable type"); |
| return; |
| } |
| } |
| |
| void StackMapFrame::set_local(int32_t index, VerificationType type, TRAPS) { |
| assert(!type.is_check(), "Must be a real type"); |
| if (index >= _max_locals) { |
| verifier()->verify_error("Local variable table overflow", _offset); |
| return; |
| } |
| // If type at index is double or long, set the next location to be unusable |
| if (_locals[index].is_double() || _locals[index].is_long()) { |
| assert((index + 1) < _locals_size, "Local variable table overflow"); |
| _locals[index + 1] = VerificationType::bogus_type(); |
| } |
| // If type at index is double_2 or long_2, set the previous location to be unusable |
| if (_locals[index].is_double2() || _locals[index].is_long2()) { |
| assert(index >= 1, "Local variable table underflow"); |
| _locals[index - 1] = VerificationType::bogus_type(); |
| } |
| _locals[index] = type; |
| if (index >= _locals_size) { |
| #ifdef ASSERT |
| for (int i=_locals_size; i<index; i++) { |
| assert(_locals[i] == VerificationType::bogus_type(), |
| "holes must be bogus type"); |
| } |
| #endif |
| _locals_size = index + 1; |
| } |
| } |
| |
| void StackMapFrame::set_local_2( |
| int32_t index, VerificationType type1, VerificationType type2, TRAPS) { |
| assert(type1.is_long() || type1.is_double(), "must be long/double"); |
| assert(type2.is_long2() || type2.is_double2(), "must be long/double_2"); |
| if (index >= _max_locals - 1) { |
| verifier()->verify_error("Local variable table overflow", _offset); |
| return; |
| } |
| // If type at index+1 is double or long, set the next location to be unusable |
| if (_locals[index+1].is_double() || _locals[index+1].is_long()) { |
| assert((index + 2) < _locals_size, "Local variable table overflow"); |
| _locals[index + 2] = VerificationType::bogus_type(); |
| } |
| // If type at index is double_2 or long_2, set the previous location to be unusable |
| if (_locals[index].is_double2() || _locals[index].is_long2()) { |
| assert(index >= 1, "Local variable table underflow"); |
| _locals[index - 1] = VerificationType::bogus_type(); |
| } |
| _locals[index] = type1; |
| _locals[index+1] = type2; |
| if (index >= _locals_size - 1) { |
| #ifdef ASSERT |
| for (int i=_locals_size; i<index; i++) { |
| assert(_locals[i] == VerificationType::bogus_type(), |
| "holes must be bogus type"); |
| } |
| #endif |
| _locals_size = index + 2; |
| } |
| } |
| |
| #ifndef PRODUCT |
| |
| void StackMapFrame::print() const { |
| tty->print_cr("stackmap_frame[%d]:", _offset); |
| tty->print_cr("flags = 0x%x", _flags); |
| tty->print("locals[%d] = { ", _locals_size); |
| for (int32_t i = 0; i < _locals_size; i++) { |
| _locals[i].print_on(tty); |
| } |
| tty->print_cr(" }"); |
| tty->print("stack[%d] = { ", _stack_size); |
| for (int32_t j = 0; j < _stack_size; j++) { |
| _stack[j].print_on(tty); |
| } |
| tty->print_cr(" }"); |
| } |
| |
| #endif |