author | eosterlund |
Thu, 20 Dec 2018 10:41:45 +0100 | |
changeset 53084 | 293cec2f7670 |
parent 51333 | f6641fcf7b7e |
child 53244 | 9807daeb47c4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_CODE_EXCEPTIONHANDLERTABLE_HPP |
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#define SHARE_VM_CODE_EXCEPTIONHANDLERTABLE_HPP |
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#include "memory/allocation.hpp" |
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#include "oops/method.hpp" |
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#include "utilities/align.hpp" |
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// A HandlerTableEntry describes an individual entry of a subtable |
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// of ExceptionHandlerTable. An entry consists of a pair(bci, pco), |
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// where bci is the exception handler bci, and pco is the pc offset |
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// relative to the nmethod code start for the compiled exception |
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// handler corresponding to the (interpreted) exception handler |
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// starting at bci. |
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// |
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// The first HandlerTableEntry of each subtable holds the length |
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// and catch_pco for the subtable (the length is the number of |
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// subtable entries w/o header). |
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class HandlerTableEntry { |
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private: |
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int _bci; |
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int _pco; |
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int _scope_depth; |
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public: |
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HandlerTableEntry(int bci, int pco, int scope_depth) { |
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assert( 0 <= pco, "pco must be positive"); |
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assert( 0 <= scope_depth, "scope_depth must be positive"); |
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_bci = bci; |
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_pco = pco; |
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_scope_depth = scope_depth; |
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} |
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int len() const { return _bci; } // for entry at subtable begin |
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int bci() const { return _bci; } |
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int pco() const { return _pco; } |
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int scope_depth() const { return _scope_depth; } |
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}; |
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// An ExceptionHandlerTable is an abstraction over a list of subtables |
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// of exception handlers for CatchNodes. Each subtable has a one-entry |
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// header holding length and catch_pco of the subtable, followed |
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// by 'length' entries for each exception handler that can be reached |
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// from the corresponding CatchNode. The catch_pco is the pc offset of |
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// the CatchNode in the corresponding nmethod. Empty subtables are dis- |
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// carded. |
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// |
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// Structure of the table: |
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// |
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// table = { subtable }. |
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// subtable = header entry { entry }. |
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// header = a pair (number of subtable entries, catch pc offset, [unused]) |
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// entry = a pair (handler bci, handler pc offset, scope depth) |
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// |
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// An ExceptionHandlerTable can be created from scratch, in which case |
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// it is possible to add subtables. It can also be created from an |
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// nmethod (for lookup purposes) in which case the table cannot be |
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// modified. |
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class nmethod; |
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class ExceptionHandlerTable { |
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private: |
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HandlerTableEntry* _table; // the table |
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int _length; // the current length of the table |
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int _size; // the number of allocated entries |
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ReallocMark _nesting; // assertion check for reallocations |
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// add the entry & grow the table if needed |
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void add_entry(HandlerTableEntry entry); |
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HandlerTableEntry* subtable_for(int catch_pco) const; |
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// (compile-time) construction within compiler |
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ExceptionHandlerTable(int initial_size = 8); |
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// (run-time) construction from nmethod |
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ExceptionHandlerTable(const CompiledMethod* nm); |
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// (compile-time) add entries |
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void add_subtable( |
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int catch_pco, // the pc offset for the CatchNode |
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GrowableArray<intptr_t>* handler_bcis, // the exception handler entry point bcis |
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GrowableArray<intptr_t>* scope_depths_from_top_scope, |
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// if representing exception handlers in multiple |
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// inlined scopes, indicates which scope relative to |
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// the youngest/innermost one in which we are performing |
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// the lookup; zero (or null GrowableArray) indicates |
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// innermost scope |
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GrowableArray<intptr_t>* handler_pcos // pc offsets for the compiled handlers |
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); |
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// nmethod support |
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int size_in_bytes() const { return align_up(_length * (int)sizeof(HandlerTableEntry), oopSize); } |
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void copy_to(CompiledMethod* nm); |
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void copy_bytes_to(address addr); |
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// lookup |
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HandlerTableEntry* entry_for(int catch_pco, int handler_bci, int scope_depth) const; |
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// debugging |
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void print_subtable(HandlerTableEntry* t) const; |
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void print() const; |
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void print_subtable_for(int catch_pco) const; |
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}; |
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// ---------------------------------------------------------------------------- |
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// Implicit null exception tables. Maps an exception PC offset to a |
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// continuation PC offset. During construction it's a variable sized |
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// array with a max size and current length. When stored inside an |
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// nmethod a zero length table takes no space. This is detected by |
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// nul_chk_table_size() == 0. Otherwise the table has a length word |
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// followed by pairs of <excp-offset, const-offset>. |
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// Use 32-bit representation for offsets |
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typedef uint implicit_null_entry; |
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class ImplicitExceptionTable { |
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uint _size; |
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uint _len; |
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implicit_null_entry *_data; |
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implicit_null_entry *adr( uint idx ) const { return &_data[2*idx]; } |
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ReallocMark _nesting; // assertion check for reallocations |
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public: |
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ImplicitExceptionTable( ) : _size(0), _len(0), _data(0) { } |
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// (run-time) construction from nmethod |
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ImplicitExceptionTable( const nmethod *nm ); |
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void set_size( uint size ); |
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void append( uint exec_off, uint cont_off ); |
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uint at( uint exec_off ) const; |
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uint len() const { return _len; } |
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int size_in_bytes() const { return len() == 0 ? 0 : ((2 * len() + 1) * sizeof(implicit_null_entry)); } |
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void copy_to(nmethod* nm); |
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void print(address base) const; |
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void verify(nmethod *nm) const; |
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}; |
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#endif // SHARE_VM_CODE_EXCEPTIONHANDLERTABLE_HPP |