hotspot/src/share/vm/c1/c1_IR.hpp
author iveresov
Fri, 04 Jun 2010 11:18:04 -0700
changeset 5707 6c66849ed24e
parent 5702 201c5cde25bb
child 6745 a34ef8968a84
permissions -rw-r--r--
6958292: C1: Enable parallel compilation Summary: Enable parallel compilation in C1 Reviewed-by: never, kvn
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/*
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 * Copyright (c) 1999, 2010, 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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// An XHandler is a C1 internal description for an exception handler
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class XHandler: public CompilationResourceObj {
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  ciExceptionHandler* _desc;
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  BlockBegin*         _entry_block;  // Entry block of xhandler
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  LIR_List*           _entry_code;   // LIR-operations that must be executed before jumping to entry_block
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  int                 _entry_pco;    // pco where entry_code (or entry_block if no entry_code) starts
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  int                 _phi_operand;  // For resolving of phi functions at begin of entry_block
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  int                 _scope_count;  // for filling ExceptionRangeEntry::scope_count
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#ifdef ASSERT
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  int                 _lir_op_id;    // op_id of the LIR-operation throwing to this handler
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#endif
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  // creation
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  XHandler(ciExceptionHandler* desc)
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    : _desc(desc)
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    , _entry_block(NULL)
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    , _entry_code(NULL)
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    , _entry_pco(-1)
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    , _phi_operand(-1)
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    , _scope_count(-1)
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#ifdef ASSERT
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    , _lir_op_id(-1)
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#endif
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  { }
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  XHandler(XHandler* other)
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    : _desc(other->_desc)
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    , _entry_block(other->_entry_block)
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    , _entry_code(other->_entry_code)
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    , _entry_pco(other->_entry_pco)
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    , _phi_operand(other->_phi_operand)
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    , _scope_count(other->_scope_count)
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#ifdef ASSERT
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    , _lir_op_id(other->_lir_op_id)
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#endif
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  { }
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  // accessors for data of ciExceptionHandler
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  int  beg_bci() const                           { return _desc->start(); }
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  int  end_bci() const                           { return _desc->limit(); }
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  int  handler_bci() const                       { return _desc->handler_bci(); }
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  bool is_catch_all() const                      { return _desc->is_catch_all(); }
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  int  catch_type() const                        { return _desc->catch_klass_index(); }
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  ciInstanceKlass* catch_klass() const           { return _desc->catch_klass(); }
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  bool covers(int bci) const                     { return beg_bci() <= bci && bci < end_bci(); }
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  // accessors for additional fields
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  BlockBegin* entry_block() const                { return _entry_block; }
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  LIR_List*   entry_code() const                 { return _entry_code; }
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  int         entry_pco() const                  { return _entry_pco; }
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  int         phi_operand() const                { assert(_phi_operand != -1, "not set"); return _phi_operand; }
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  int         scope_count() const                { assert(_scope_count != -1, "not set"); return _scope_count; }
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  DEBUG_ONLY(int lir_op_id() const               { return _lir_op_id; });
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  void set_entry_block(BlockBegin* entry_block) {
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    assert(entry_block->is_set(BlockBegin::exception_entry_flag), "must be an exception handler entry");
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    assert(entry_block->bci() == handler_bci(), "bci's must correspond");
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    _entry_block = entry_block;
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  }
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  void set_entry_code(LIR_List* entry_code)      { _entry_code = entry_code; }
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  void set_entry_pco(int entry_pco)              { _entry_pco = entry_pco; }
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  void set_phi_operand(int phi_operand)          { _phi_operand = phi_operand; }
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  void set_scope_count(int scope_count)          { _scope_count = scope_count; }
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  DEBUG_ONLY(void set_lir_op_id(int lir_op_id)   { _lir_op_id = lir_op_id; });
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  bool equals(XHandler* other) const;
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};
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define_array(_XHandlerArray, XHandler*)
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define_stack(_XHandlerList, _XHandlerArray)
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// XHandlers is the C1 internal list of exception handlers for a method
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class XHandlers: public CompilationResourceObj {
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  _XHandlerList    _list;
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  // creation
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  XHandlers() : _list()                          { }
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  XHandlers(ciMethod* method);
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  XHandlers(XHandlers* other);
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  // accessors
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  int       length() const                       { return _list.length(); }
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  XHandler* handler_at(int i) const              { return _list.at(i); }
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  bool      has_handlers() const                 { return _list.length() > 0; }
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  void      append(XHandler* h)                  { _list.append(h); }
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  XHandler* remove_last()                        { return _list.pop(); }
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  bool      could_catch(ciInstanceKlass* klass, bool type_is_exact) const;
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  bool      equals(XHandlers* others) const;
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};
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class IRScope;
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define_array(IRScopeArray, IRScope*)
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define_stack(IRScopeList, IRScopeArray)
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class Compilation;
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class IRScope: public CompilationResourceObj {
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  // hierarchy
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  Compilation*  _compilation;                    // the current compilation
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  IRScope*      _caller;                         // the caller scope, or NULL
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  int           _caller_bci;                     // the caller bci of the corresponding (inlined) invoke, or < 0
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  ValueStack*   _caller_state;                   // the caller state, or NULL
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  int           _level;                          // the inlining level
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  ciMethod*     _method;                         // the corresponding method
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  IRScopeList   _callees;                        // the inlined method scopes
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  // graph
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  XHandlers*    _xhandlers;                      // the exception handlers
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  int           _number_of_locks;                // the number of monitor lock slots needed
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  bool          _monitor_pairing_ok;             // the monitor pairing info
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  BlockBegin*   _start;                          // the start block, successsors are method entries
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  // lock stack management
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  int           _lock_stack_size;                // number of expression stack elements which, if present,
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                                                 // must be spilled to the stack because of exception
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                                                 // handling inside inlined methods
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  BitMap        _requires_phi_function;          // bit is set if phi functions at loop headers are necessary for a local variable
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  // helper functions
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  BlockBegin* header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state);
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  BlockBegin* build_graph(Compilation* compilation, int osr_bci);
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  // creation
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  IRScope(Compilation* compilation, IRScope* caller, int caller_bci, ciMethod* method, int osr_bci, bool create_graph = false);
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  // accessors
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  Compilation*  compilation() const              { return _compilation; }
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  IRScope*      caller() const                   { return _caller; }
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  int           caller_bci() const               { return _caller_bci; }
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  ValueStack*   caller_state() const             { return _caller_state; }
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  int           level() const                    { return _level; }
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  ciMethod*     method() const                   { return _method; }
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  int           max_stack() const;               // NOTE: expensive
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  int           lock_stack_size() const          {
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    assert(_lock_stack_size != -1, "uninitialized");
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    return _lock_stack_size;
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  }
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  BitMap&       requires_phi_function()          { return _requires_phi_function; }
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  // mutators
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  // Needed because caller state is not ready at time of IRScope construction
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  void          set_caller_state(ValueStack* state) { _caller_state = state; }
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  // Needed because caller state changes after IRScope construction.
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  // Computes number of expression stack elements whose state must be
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  // preserved in the case of an exception; these may be seen by
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  // caller scopes. Zero when inlining of methods containing exception
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  // handlers is disabled, otherwise a conservative approximation.
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  void          compute_lock_stack_size();
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  // hierarchy
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  bool          is_top_scope() const             { return _caller == NULL; }
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  void          add_callee(IRScope* callee)      { _callees.append(callee); }
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  int           number_of_callees() const        { return _callees.length(); }
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  IRScope*      callee_no(int i) const           { return _callees.at(i); }
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  int           top_scope_bci() const;
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  // accessors, graph
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  bool          is_valid() const                 { return start() != NULL; }
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  XHandlers*    xhandlers() const                { return _xhandlers; }
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  int           number_of_locks() const          { return _number_of_locks; }
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  void          set_min_number_of_locks(int n)   { if (n > _number_of_locks) _number_of_locks = n; }
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  bool          monitor_pairing_ok() const       { return _monitor_pairing_ok; }
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  BlockBegin*   start() const                    { return _start; }
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};
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//
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// IRScopeDebugInfo records the debug information for a particular IRScope
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// in a particular CodeEmitInfo.  This allows the information to be computed
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// once early enough for the OopMap to be available to the LIR and also to be
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// reemited for different pcs using the same CodeEmitInfo without recomputing
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// everything.
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//
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class IRScopeDebugInfo: public CompilationResourceObj {
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  IRScope*                      _scope;
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  int                           _bci;
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  GrowableArray<ScopeValue*>*   _locals;
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  GrowableArray<ScopeValue*>*   _expressions;
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  GrowableArray<MonitorValue*>* _monitors;
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  IRScopeDebugInfo*             _caller;
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  IRScopeDebugInfo(IRScope*                      scope,
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                   int                           bci,
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                   GrowableArray<ScopeValue*>*   locals,
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                   GrowableArray<ScopeValue*>*   expressions,
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                   GrowableArray<MonitorValue*>* monitors,
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                   IRScopeDebugInfo*             caller):
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      _scope(scope)
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    , _locals(locals)
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    , _bci(bci)
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    , _expressions(expressions)
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    , _monitors(monitors)
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    , _caller(caller) {}
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  IRScope*                      scope()       { return _scope;       }
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  int                           bci()         { return _bci;         }
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  GrowableArray<ScopeValue*>*   locals()      { return _locals;      }
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  GrowableArray<ScopeValue*>*   expressions() { return _expressions; }
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  GrowableArray<MonitorValue*>* monitors()    { return _monitors;    }
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  IRScopeDebugInfo*             caller()      { return _caller;      }
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  //Whether we should reexecute this bytecode for deopt
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  bool should_reexecute();
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  void record_debug_info(DebugInformationRecorder* recorder, int pc_offset, bool topmost, bool is_method_handle_invoke = false) {
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    if (caller() != NULL) {
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      // Order is significant:  Must record caller first.
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      caller()->record_debug_info(recorder, pc_offset, false/*topmost*/);
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    }
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    DebugToken* locvals = recorder->create_scope_values(locals());
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    DebugToken* expvals = recorder->create_scope_values(expressions());
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    DebugToken* monvals = recorder->create_monitor_values(monitors());
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    // reexecute allowed only for the topmost frame
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    bool reexecute = topmost ? should_reexecute() : false;
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    bool return_oop = false; // This flag will be ignored since it used only for C2 with escape analysis.
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    recorder->describe_scope(pc_offset, scope()->method(), bci(), reexecute, is_method_handle_invoke, return_oop, locvals, expvals, monvals);
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  }
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};
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class CodeEmitInfo: public CompilationResourceObj {
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  friend class LinearScan;
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  IRScopeDebugInfo* _scope_debug_info;
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  IRScope*          _scope;
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  XHandlers*        _exception_handlers;
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  OopMap*           _oop_map;
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  ValueStack*       _stack;                      // used by deoptimization (contains also monitors
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  int               _bci;
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  CodeEmitInfo*     _next;
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  int               _id;
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  bool              _is_method_handle_invoke;    // true if the associated call site is a MethodHandle call site.
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  FrameMap*     frame_map() const                { return scope()->compilation()->frame_map(); }
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  Compilation*  compilation() const              { return scope()->compilation(); }
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 public:
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  // use scope from ValueStack
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  CodeEmitInfo(int bci, ValueStack* stack, XHandlers* exception_handlers);
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  // used by natives
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  CodeEmitInfo(IRScope* scope, int bci)
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    : _scope(scope)
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    , _bci(bci)
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    , _oop_map(NULL)
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    , _scope_debug_info(NULL)
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    , _stack(NULL)
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    , _exception_handlers(NULL)
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    , _next(NULL)
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    , _id(-1)
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    , _is_method_handle_invoke(false) {
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  }
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  // make a copy
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  CodeEmitInfo(CodeEmitInfo* info, bool lock_stack_only = false);
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  // accessors
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  OopMap* oop_map()                              { return _oop_map; }
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  ciMethod* method() const                       { return _scope->method(); }
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  IRScope* scope() const                         { return _scope; }
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  XHandlers* exception_handlers() const          { return _exception_handlers; }
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  ValueStack* stack() const                      { return _stack; }
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  int bci() const                                { return _bci; }
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  void add_register_oop(LIR_Opr opr);
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  void record_debug_info(DebugInformationRecorder* recorder, int pc_offset);
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  CodeEmitInfo* next() const        { return _next; }
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  void set_next(CodeEmitInfo* next) { _next = next; }
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  int id() const      { return _id; }
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  void set_id(int id) { _id = id; }
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  bool     is_method_handle_invoke() const { return _is_method_handle_invoke;     }
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  void set_is_method_handle_invoke(bool x) {        _is_method_handle_invoke = x; }
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};
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class IR: public CompilationResourceObj {
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  Compilation*     _compilation;                 // the current compilation
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  IRScope*         _top_scope;                   // the root of the scope hierarchy
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  WordSize         _locals_size;                 // the space required for all locals
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  int              _num_loops;                   // Total number of loops
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  BlockList*       _code;                        // the blocks in code generation order w/ use counts
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  // creation
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  IR(Compilation* compilation, ciMethod* method, int osr_bci);
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  // accessors
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  bool             is_valid() const              { return top_scope()->is_valid(); }
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  Compilation*     compilation() const           { return _compilation; }
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  IRScope*         top_scope() const             { return _top_scope; }
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  int              number_of_locks() const       { return top_scope()->number_of_locks(); }
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  ciMethod*        method() const                { return top_scope()->method(); }
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  BlockBegin*      start() const                 { return top_scope()->start(); }
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  BlockBegin*      std_entry() const             { return start()->end()->as_Base()->std_entry(); }
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  BlockBegin*      osr_entry() const             { return start()->end()->as_Base()->osr_entry(); }
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  WordSize         locals_size() const           { return _locals_size; }
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  int              locals_size_in_words() const  { return in_words(_locals_size); }
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  BlockList*       code() const                  { return _code; }
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  int              num_loops() const             { return _num_loops; }
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  int              max_stack() const             { return top_scope()->max_stack(); } // expensive
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  // ir manipulation
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  void optimize();
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  void compute_predecessors();
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  void split_critical_edges();
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  void compute_code();
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  void compute_use_counts();
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  // The linear-scan order and the code emission order are equal, but
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  // this may change in future
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  BlockList* linear_scan_order() {  assert(_code != NULL, "not computed"); return _code; }
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  // iteration
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  void iterate_preorder   (BlockClosure* closure);
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  void iterate_postorder  (BlockClosure* closure);
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  void iterate_linear_scan_order(BlockClosure* closure);
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  // debugging
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  static void print(BlockBegin* start, bool cfg_only, bool live_only = false) PRODUCT_RETURN;
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  void print(bool cfg_only, bool live_only = false)                           PRODUCT_RETURN;
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  void verify()                                                               PRODUCT_RETURN;
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};
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// Globally do instruction substitution and remove substituted
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// instructions from the instruction list.
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//
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class SubstitutionResolver: public BlockClosure, ValueVisitor {
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diff changeset
   375
  virtual void visit(Value* v);
1
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parents:
diff changeset
   376
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diff changeset
   377
 public:
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   378
  SubstitutionResolver(IR* hir) {
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   379
    hir->iterate_preorder(this);
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   380
  }
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parents:
diff changeset
   381
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   382
  SubstitutionResolver(BlockBegin* block) {
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   383
    block->iterate_preorder(this);
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   384
  }
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   385
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   386
  virtual void block_do(BlockBegin* block);
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   387
};