jdk8-mips64-public/hotspot: comparison src/share/vm/classfile/stackMapTable.hpp

--1:000000000000
+:a61af66fc99e
+/*
+* 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.
+*
+*/
+class StackMapReader;
+// StackMapTable class is the StackMap table used by type checker
+class StackMapTable : public StackObj {
+private:
+// Logically, the _frame_count (as well as many fields in the StackFrame)
+// should be a u2, but if we defined the variable as that type it will
+// be difficult to detect/recover from overflow or underflow conditions.
+// Widening the type and making it signed will help detect these.
+int32_t              _code_length;
+int32_t              _frame_count;     // Stackmap frame count
+StackMapFrame**       _frame_array;
+public:
+StackMapTable(StackMapReader* reader, StackMapFrame* init_frame,
+u2 max_locals, u2 max_stack,
+char* code_data, int code_len, TRAPS);
+inline int32_t get_frame_count() const { return _frame_count; }
+inline int get_offset(int index) const {
+return _frame_array[index]->offset();
+}
+// Match and/or update current_frame to the frame in stackmap table with
+// specified offset. Return true if the two frames match.
+bool match_stackmap(
+StackMapFrame* current_frame, int32_t offset,
+bool match, bool update, TRAPS) const;
+// Match and/or update current_frame to the frame in stackmap table with
+// specified offset and frame index. Return true if the two frames match.
+bool match_stackmap(
+StackMapFrame* current_frame, int32_t offset, int32_t frame_index,
+bool match, bool update, TRAPS) const;
+// Check jump instructions. Make sure there are no uninitialized
+// instances on backward branch.
+void check_jump_target(StackMapFrame* frame, int32_t target, TRAPS) const;
+// The following methods are only used inside this class.
+// Returns the frame array index where the frame with offset is stored.
+int get_index_from_offset(int32_t offset) const;
+// Make sure that there's no uninitialized object exist on backward branch.
+void check_new_object(
+const StackMapFrame* frame, int32_t target, TRAPS) const;
+// Debugging
+void print() const PRODUCT_RETURN;
+};
+class StackMapStream : StackObj {
+private:
+typeArrayHandle _data;
+int _index;
+public:
+StackMapStream(typeArrayHandle ah)
+: _data(ah), _index(0) {
+}
+u1 get_u1(TRAPS) {
+if (_data == NULL || _index >= _data->length()) {
+stackmap_format_error("access beyond the end of attribute", CHECK_0);
+}
+return _data->byte_at(_index++);
+}
+u2 get_u2(TRAPS) {
+if (_data == NULL || _index >= _data->length() - 1) {
+stackmap_format_error("access beyond the end of attribute", CHECK_0);
+}
+u2 res = Bytes::get_Java_u2((u1*)_data->byte_at_addr(_index));
+_index += 2;
+return res;
+}
+bool at_end() {
+return (_data == NULL) || (_index == _data->length());
+}
+static void stackmap_format_error(const char* msg, TRAPS);
+};
+class StackMapReader : StackObj {
+private:
+// information about the class and method
+constantPoolHandle  _cp;
+ClassVerifier* _verifier;
+StackMapStream* _stream;
+char* _code_data;
+int32_t _code_length;
+// information get from the attribute
+int32_t  _frame_count;       // frame count
+int32_t chop(VerificationType* locals, int32_t length, int32_t chops);
+VerificationType parse_verification_type(u1* flags, TRAPS);
+void check_verification_type_array_size(
+int32_t size, int32_t max_size, TRAPS) {
+if (size < 0 || size > max_size) {
+// Since this error could be caused someone rewriting the method
+// but not knowing to update the stackmap data, we call the the
+// verifier's error method, which may not throw an exception and
+// failover to the old verifier instead.
+_verifier->class_format_error(
+"StackMapTable format error: bad type array size");
+}
+}
+enum {
+SAME_LOCALS_1_STACK_ITEM_EXTENDED = 247,
+SAME_EXTENDED = 251,
+FULL = 255
+};
+public:
+// Constructor
+StackMapReader(ClassVerifier* v, StackMapStream* stream, char* code_data,
+int32_t code_len, TRAPS) :
+_verifier(v), _stream(stream),
+_code_data(code_data), _code_length(code_len) {
+methodHandle m = v->method();
+if (m->has_stackmap_table()) {
+_cp = constantPoolHandle(THREAD, m->constants());
+_frame_count = _stream->get_u2(CHECK);
+} else {
+// There's no stackmap table present. Frame count and size are 0.
+_frame_count = 0;
+}
+}
+inline int32_t get_frame_count() const                { return _frame_count; }
+StackMapFrame* next(StackMapFrame* pre_frame, bool first,
+u2 max_locals, u2 max_stack, TRAPS);
+void check_end(TRAPS) {
+if (!_stream->at_end()) {
+StackMapStream::stackmap_format_error("wrong attribute size", CHECK);
+}
+}
+};

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/classfile/stackMapTable.hpp

src/share/vm/classfile/stackMapTable.hpp