Mercurial > hg > graal-compiler
view src/share/vm/classfile/stackMapTable.hpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | b92c45f2bc75 |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP #define SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP #include "classfile/stackMapFrame.hpp" #include "memory/allocation.hpp" #include "oops/constantPoolOop.hpp" #include "oops/methodOop.hpp" #include "utilities/globalDefinitions.hpp" #ifdef TARGET_ARCH_x86 # include "bytes_x86.hpp" #endif #ifdef TARGET_ARCH_sparc # include "bytes_sparc.hpp" #endif #ifdef TARGET_ARCH_zero # include "bytes_zero.hpp" #endif 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); } } }; #endif // SHARE_VM_CLASSFILE_STACKMAPTABLE_HPP