--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/classfile/stackMapFrame.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,226 @@
+/*
+ * 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.
+ *
+ */
+
+// A StackMapFrame represents one frame in the stack map attribute.
+
+enum {
+ FLAG_THIS_UNINIT = 0x01
+};
+
+class StackMapFrame : public ResourceObj {
+ private:
+ int32_t _offset;
+
+ // See comment in StackMapTable about _frame_count about why these
+ // fields are int32_t instead of u2.
+ int32_t _locals_size; // number of valid type elements in _locals
+ int32_t _stack_size; // number of valid type elements in _stack
+
+ int32_t _max_locals;
+ int32_t _max_stack;
+
+ u1 _flags;
+ VerificationType* _locals; // local variable type array
+ VerificationType* _stack; // operand stack type array
+
+ ClassVerifier* _verifier; // the verifier verifying this method
+
+ public:
+ // constructors
+
+ // This constructor is used by the type checker to allocate frames
+ // in type state, which have _max_locals and _max_stack array elements
+ // in _locals and _stack.
+ StackMapFrame(u2 max_locals, u2 max_stack, ClassVerifier* verifier);
+
+ // This constructor is used to initialize stackmap frames in stackmap table,
+ // which have _locals_size and _stack_size array elements in _locals and _stack.
+ StackMapFrame(int32_t offset,
+ u1 flags,
+ u2 locals_size,
+ u2 stack_size,
+ u2 max_locals,
+ u2 max_stack,
+ VerificationType* locals,
+ VerificationType* stack,
+ ClassVerifier* v) : _offset(offset), _flags(flags),
+ _locals_size(locals_size),
+ _stack_size(stack_size),
+ _max_locals(max_locals),
+ _max_stack(max_stack),
+ _locals(locals), _stack(stack),
+ _verifier(v) { }
+
+ inline void set_offset(int32_t offset) { _offset = offset; }
+ inline void set_verifier(ClassVerifier* v) { _verifier = v; }
+ inline void set_flags(u1 flags) { _flags = flags; }
+ inline void set_locals_size(u2 locals_size) { _locals_size = locals_size; }
+ inline void set_stack_size(u2 stack_size) { _stack_size = stack_size; }
+ inline void clear_stack() { _stack_size = 0; }
+ inline int32_t offset() const { return _offset; }
+ inline ClassVerifier* verifier() const { return _verifier; }
+ inline u1 flags() const { return _flags; }
+ inline int32_t locals_size() const { return _locals_size; }
+ inline VerificationType* locals() const { return _locals; }
+ inline int32_t stack_size() const { return _stack_size; }
+ inline VerificationType* stack() const { return _stack; }
+ inline int32_t max_locals() const { return _max_locals; }
+ inline int32_t max_stack() const { return _max_stack; }
+ inline bool flag_this_uninit() const { return _flags & FLAG_THIS_UNINIT; }
+
+ // Set locals and stack types to bogus
+ inline void reset() {
+ 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();
+ }
+ }
+
+ // Return a StackMapFrame with the same local variable array and empty stack.
+ // Stack array is allocate with unused one element.
+ StackMapFrame* frame_in_exception_handler(u1 flags);
+
+ // Set local variable type array based on m's signature.
+ VerificationType set_locals_from_arg(
+ const methodHandle m, VerificationType thisKlass, TRAPS);
+
+ // Search local variable type array and stack type array.
+ // Return true if an uninitialized object is found.
+ bool has_new_object() const;
+
+ // Search local variable type array and stack type array.
+ // Set every element with type of old_object to new_object.
+ void initialize_object(
+ VerificationType old_object, VerificationType new_object);
+
+ // Copy local variable type array in src into this local variable type array.
+ void copy_locals(const StackMapFrame* src);
+
+ // Copy stack type array in src into this stack type array.
+ void copy_stack(const StackMapFrame* src);
+
+ // Return true if this stack map frame is assignable to target.
+ bool is_assignable_to(const StackMapFrame* target, TRAPS) const;
+
+ // Push type into stack type array.
+ inline void push_stack(VerificationType type, TRAPS) {
+ assert(!type.is_check(), "Must be a real type");
+ if (_stack_size >= _max_stack) {
+ verifier()->verify_error(_offset, "Operand stack overflow");
+ return;
+ }
+ _stack[_stack_size++] = type;
+ }
+
+ inline void push_stack_2(
+ 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 (_stack_size >= _max_stack - 1) {
+ verifier()->verify_error(_offset, "Operand stack overflow");
+ return;
+ }
+ _stack[_stack_size++] = type1;
+ _stack[_stack_size++] = type2;
+ }
+
+ // Pop and return the top type on stack without verifying.
+ inline VerificationType pop_stack(TRAPS) {
+ if (_stack_size <= 0) {
+ verifier()->verify_error(_offset, "Operand stack underflow");
+ return VerificationType::bogus_type();
+ }
+ // Put bogus type to indicate it's no longer valid.
+ // Added to make it consistent with the other pop_stack method.
+ VerificationType top = _stack[--_stack_size];
+ NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); )
+ return top;
+ }
+
+ // Pop and return the top type on stack type array after verifying it
+ // is assignable to type.
+ inline VerificationType pop_stack(VerificationType type, TRAPS) {
+ if (_stack_size != 0) {
+ VerificationType top = _stack[_stack_size - 1];
+ bool subtype = type.is_assignable_from(
+ top, verifier()->current_class(),
+ CHECK_(VerificationType::bogus_type()));
+ if (subtype) {
+ _stack_size --;
+ NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); )
+ return top;
+ }
+ }
+ return pop_stack_ex(type, THREAD);
+ }
+
+ inline void pop_stack_2(
+ VerificationType type1, VerificationType type2, TRAPS) {
+ assert(type1.is_long2() || type1.is_double2(), "must be long/double");
+ assert(type2.is_long() || type2.is_double(), "must be long/double_2");
+ if (_stack_size >= 2) {
+ VerificationType top1 = _stack[_stack_size - 1];
+ bool subtype1 = type1.is_assignable_from(
+ top1, verifier()->current_class(), CHECK);
+ VerificationType top2 = _stack[_stack_size - 2];
+ bool subtype2 = type2.is_assignable_from(
+ top2, verifier()->current_class(), CHECK);
+ if (subtype1 && subtype2) {
+ _stack_size -= 2;
+ NOT_PRODUCT( _stack[_stack_size] = VerificationType::bogus_type(); )
+ NOT_PRODUCT( _stack[_stack_size+1] = VerificationType::bogus_type(); )
+ return;
+ }
+ }
+ pop_stack_ex(type1, THREAD);
+ pop_stack_ex(type2, THREAD);
+ }
+
+ // Uncommon case that throws exceptions.
+ VerificationType pop_stack_ex(VerificationType type, TRAPS);
+
+ // Return the type at index in local variable array after verifying
+ // it is assignable to type.
+ VerificationType get_local(int32_t index, VerificationType type, TRAPS);
+ // For long/double.
+ void get_local_2(
+ int32_t index, VerificationType type1, VerificationType type2, TRAPS);
+
+ // Set element at index in local variable array to type.
+ void set_local(int32_t index, VerificationType type, TRAPS);
+ // For long/double.
+ void set_local_2(
+ int32_t index, VerificationType type1, VerificationType type2, TRAPS);
+
+ // Private auxiliary method used only in is_assignable_to(StackMapFrame).
+ // Returns true if src is assignable to target.
+ bool is_assignable_to(
+ VerificationType* src, VerificationType* target, int32_t len, TRAPS) const;
+
+ // Debugging
+ void print() const PRODUCT_RETURN;
+};