jdk8-mips64-public/hotspot: src/share/vm/adlc/dfa.cpp@2c6ef90f030a (annotated)

src/share/vm/adlc/dfa.cpp@2c6ef90f030a (annotated)

src/share/vm/adlc/dfa.cpp

Mon, 07 Jul 2014 10:12:40 +0200

author: stefank
date: Mon, 07 Jul 2014 10:12:40 +0200
changeset 6992: 2c6ef90f030a
parent 6198: 55fb97c4c58d
child 6876: 710a3c8b516e
child 9615: c5e1abd2d0af
permissions: -rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

 /*
  * Copyright (c) 1997, 2013, 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.
  *
  */
 // DFA.CPP - Method definitions for outputting the matcher DFA from ADLC
 #include "adlc.hpp"
 //---------------------------Switches for debugging output---------------------
 static bool debug_output   = false;
 static bool debug_output1  = false;    // top level chain rules
 //---------------------------Access to internals of class State----------------
 static const char *sLeft   = "_kids[0]";
 static const char *sRight  = "_kids[1]";
 //---------------------------DFA productions-----------------------------------
 static const char *dfa_production           = "DFA_PRODUCTION";
 static const char *dfa_production_set_valid = "DFA_PRODUCTION__SET_VALID";
 //---------------------------Production State----------------------------------
 static const char *knownInvalid = "knownInvalid";    // The result does NOT have a rule defined
 static const char *knownValid   = "knownValid";      // The result must be produced by a rule
 static const char *unknownValid = "unknownValid";    // Unknown (probably due to a child or predicate constraint)
 static const char *noConstraint  = "noConstraint";   // No constraints seen so far
 static const char *hasConstraint = "hasConstraint";  // Within the first constraint
 //------------------------------Production------------------------------------
 // Track the status of productions for a particular result
 class Production {
 public:
   const char *_result;
   const char *_constraint;
   const char *_valid;
   Expr       *_cost_lb;            // Cost lower bound for this production
   Expr       *_cost_ub;            // Cost upper bound for this production
 public:
   Production(const char *result, const char *constraint, const char *valid);
   ~Production() {};
   void        initialize();        // reset to be an empty container
   const char   *valid()  const { return _valid; }
   Expr       *cost_lb()  const { return (Expr *)_cost_lb;  }
   Expr       *cost_ub()  const { return (Expr *)_cost_ub;  }
   void print();
 };
 //------------------------------ProductionState--------------------------------
 // Track the status of all production rule results
 // Reset for each root opcode (e.g., Op_RegI, Op_AddI, ...)
 class ProductionState {
 private:
   Dict _production;    // map result of production, char*, to information or NULL
   const char *_constraint;
 public:
   // cmpstr does string comparisions.  hashstr computes a key.
   ProductionState(Arena *arena) : _production(cmpstr, hashstr, arena) { initialize(); };
   ~ProductionState() { };
   void        initialize();                // reset local and dictionary state
   const char *constraint();
   void    set_constraint(const char *constraint); // currently working inside of constraints
   const char *valid(const char *result);   // unknownValid, or status for this production
   void    set_valid(const char *result);   // if not constrained, set status to knownValid
   Expr           *cost_lb(const char *result);
   Expr           *cost_ub(const char *result);
   void    set_cost_bounds(const char *result, const Expr *cost, bool has_state_check, bool has_cost_check);
   // Return the Production associated with the result,
   // or create a new Production and insert it into the dictionary.
   Production *getProduction(const char *result);
   void print();
 private:
     // Disable public use of constructor, copy-ctor,  ...
   ProductionState( )                         : _production(cmpstr, hashstr, Form::arena) {  assert( false, "NotImplemented");  };
   ProductionState( const ProductionState & ) : _production(cmpstr, hashstr, Form::arena) {  assert( false, "NotImplemented");  }; // Deep-copy
 };
 //---------------------------Helper Functions----------------------------------
 // cost_check template:
 // 1)      if (STATE__NOT_YET_VALID(EBXREGI) || _cost[EBXREGI] > c) {
 // 2)        DFA_PRODUCTION__SET_VALID(EBXREGI, cmovI_memu_rule, c)
 // 3)      }
 //
 static void cost_check(FILE *fp, const char *spaces,
                        const char *arrayIdx, const Expr *cost, const char *rule, ProductionState &status) {
   bool state_check               = false;  // true if this production needs to check validity
   bool cost_check                = false;  // true if this production needs to check cost
   bool cost_is_above_upper_bound = false;  // true if this production is unnecessary due to high cost
   bool cost_is_below_lower_bound = false;  // true if this production replaces a higher cost production
   // Get information about this production
   const Expr *previous_ub = status.cost_ub(arrayIdx);
   if( !previous_ub->is_unknown() ) {
     if( previous_ub->less_than_or_equal(cost) ) {
       cost_is_above_upper_bound = true;
       if( debug_output ) { fprintf(fp, "// Previous rule with lower cost than: %s === %s_rule costs %s\n", arrayIdx, rule, cost->as_string()); }
     }
   }
   const Expr *previous_lb = status.cost_lb(arrayIdx);
   if( !previous_lb->is_unknown() ) {
     if( cost->less_than_or_equal(previous_lb) ) {
       cost_is_below_lower_bound = true;
       if( debug_output ) { fprintf(fp, "// Previous rule with higher cost\n"); }
     }
   }
   // line 1)
   // Check for validity and compare to other match costs
   const char *validity_check = status.valid(arrayIdx);
   if( validity_check == unknownValid ) {
     fprintf(fp, "%sif (STATE__NOT_YET_VALID(%s) || _cost[%s] > %s) {\n",  spaces, arrayIdx, arrayIdx, cost->as_string());
     state_check = true;
     cost_check  = true;
   }
   else if( validity_check == knownInvalid ) {
     if( debug_output ) { fprintf(fp, "%s// %s KNOWN_INVALID \n",  spaces, arrayIdx); }
   }
   else if( validity_check == knownValid ) {
     if( cost_is_above_upper_bound ) {
       // production cost is known to be too high.
       return;
     } else if( cost_is_below_lower_bound ) {
       // production will unconditionally overwrite a previous production that had higher cost
     } else {
       fprintf(fp, "%sif ( /* %s KNOWN_VALID || */ _cost[%s] > %s) {\n",  spaces, arrayIdx, arrayIdx, cost->as_string());
       cost_check  = true;
     }
   }
   // line 2)
   // no need to set State vector if our state is knownValid
   const char *production = (validity_check == knownValid) ? dfa_production : dfa_production_set_valid;
   fprintf(fp, "%s  %s(%s, %s_rule, %s)", spaces, production, arrayIdx, rule, cost->as_string() );
   if( validity_check == knownValid ) {
     if( cost_is_below_lower_bound ) { fprintf(fp, "\t  // overwrites higher cost rule"); }
    }
    fprintf(fp, "\n");
   // line 3)
   if( cost_check || state_check ) {
     fprintf(fp, "%s}\n", spaces);
   }
   status.set_cost_bounds(arrayIdx, cost, state_check, cost_check);
   // Update ProductionState
   if( validity_check != knownValid ) {
     // set State vector if not previously known
     status.set_valid(arrayIdx);
   }
 }
 //---------------------------child_test----------------------------------------
 // Example:
 //   STATE__VALID_CHILD(_kids[0], FOO) &&  STATE__VALID_CHILD(_kids[1], BAR)
 // Macro equivalent to: _kids[0]->valid(FOO) && _kids[1]->valid(BAR)
 //
 static void child_test(FILE *fp, MatchList &mList) {
   if (mList._lchild) { // If left child, check it
     const char* lchild_to_upper = ArchDesc::getMachOperEnum(mList._lchild);
     fprintf(fp, "STATE__VALID_CHILD(_kids[0], %s)", lchild_to_upper);
     delete[] lchild_to_upper;
   }
   if (mList._lchild && mList._rchild) { // If both, add the "&&"
     fprintf(fp, " && ");
   }
   if (mList._rchild) { // If right child, check it
     const char* rchild_to_upper = ArchDesc::getMachOperEnum(mList._rchild);
     fprintf(fp, "STATE__VALID_CHILD(_kids[1], %s)", rchild_to_upper);
     delete[] rchild_to_upper;
   }
 }
 //---------------------------calc_cost-----------------------------------------
 // Example:
 //           unsigned int c = _kids[0]->_cost[FOO] + _kids[1]->_cost[BAR] + 5;
 //
 Expr *ArchDesc::calc_cost(FILE *fp, const char *spaces, MatchList &mList, ProductionState &status) {
   fprintf(fp, "%sunsigned int c = ", spaces);
   Expr *c = new Expr("0");
   if (mList._lchild) { // If left child, add it in
     const char* lchild_to_upper = ArchDesc::getMachOperEnum(mList._lchild);
     sprintf(Expr::buffer(), "_kids[0]->_cost[%s]", lchild_to_upper);
     c->add(Expr::buffer());
     delete[] lchild_to_upper;
 }
   if (mList._rchild) { // If right child, add it in
     const char* rchild_to_upper = ArchDesc::getMachOperEnum(mList._rchild);
     sprintf(Expr::buffer(), "_kids[1]->_cost[%s]", rchild_to_upper);
     c->add(Expr::buffer());
     delete[] rchild_to_upper;
   }
   // Add in cost of this rule
   const char *mList_cost = mList.get_cost();
   c->add(mList_cost, *this);
   fprintf(fp, "%s;\n", c->as_string());
   c->set_external_name("c");
   return c;
 }
 //---------------------------gen_match-----------------------------------------
 void ArchDesc::gen_match(FILE *fp, MatchList &mList, ProductionState &status, Dict &operands_chained_from) {
   const char *spaces4 = "    ";
   const char *spaces6 = "      ";
   fprintf(fp, "%s", spaces4);
   // Only generate child tests if this is not a leaf node
   bool has_child_constraints = mList._lchild || mList._rchild;
   const char *predicate_test = mList.get_pred();
   if (has_child_constraints || predicate_test) {
     // Open the child-and-predicate-test braces
     fprintf(fp, "if( ");
     status.set_constraint(hasConstraint);
     child_test(fp, mList);
     // Only generate predicate test if one exists for this match
     if (predicate_test) {
       if (has_child_constraints) {
         fprintf(fp," &&\n");
       }
       fprintf(fp, "%s  %s", spaces6, predicate_test);
     }
     // End of outer tests
     fprintf(fp," ) ");
   } else {
     // No child or predicate test needed
     status.set_constraint(noConstraint);
   }
   // End of outer tests
   fprintf(fp,"{\n");
   // Calculate cost of this match
   const Expr *cost = calc_cost(fp, spaces6, mList, status);
   // Check against other match costs, and update cost & rule vectors
   cost_check(fp, spaces6, ArchDesc::getMachOperEnum(mList._resultStr), cost, mList._opcode, status);
   // If this is a member of an operand class, update the class cost & rule
   expand_opclass( fp, spaces6, cost, mList._resultStr, status);
   // Check if this rule should be used to generate the chains as well.
   const char *rule = /* set rule to "Invalid" for internal operands */
     strcmp(mList._opcode,mList._resultStr) ? mList._opcode : "Invalid";
   // If this rule produces an operand which has associated chain rules,
   // update the operands with the chain rule + this rule cost & this rule.
   chain_rule(fp, spaces6, mList._resultStr, cost, rule, operands_chained_from, status);
   // Close the child-and-predicate-test braces
   fprintf(fp, "    }\n");
 }
 //---------------------------expand_opclass------------------------------------
 // Chain from one result_type to all other members of its operand class
 void ArchDesc::expand_opclass(FILE *fp, const char *indent, const Expr *cost,
                               const char *result_type, ProductionState &status) {
   const Form *form = _globalNames[result_type];
   OperandForm *op = form ? form->is_operand() : NULL;
   if( op && op->_classes.count() > 0 ) {
     if( debug_output ) { fprintf(fp, "// expand operand classes for operand: %s \n", (char *)op->_ident  ); } // %%%%% Explanation
     // Iterate through all operand classes which include this operand
     op->_classes.reset();
     const char *oclass;
     // Expr *cCost = new Expr(cost);
     while( (oclass = op->_classes.iter()) != NULL )
       // Check against other match costs, and update cost & rule vectors
       cost_check(fp, indent, ArchDesc::getMachOperEnum(oclass), cost, result_type, status);
   }
 }
 //---------------------------chain_rule----------------------------------------
 // Starting at 'operand', check if we know how to automatically generate other results
 void ArchDesc::chain_rule(FILE *fp, const char *indent, const char *operand,
      const Expr *icost, const char *irule, Dict &operands_chained_from,  ProductionState &status) {
   // Check if we have already generated chains from this starting point
   if( operands_chained_from[operand] != NULL ) {
     return;
   } else {
     operands_chained_from.Insert( operand, operand);
   }
   if( debug_output ) { fprintf(fp, "// chain rules starting from: %s  and  %s \n", (char *)operand, (char *)irule); } // %%%%% Explanation
   ChainList *lst = (ChainList *)_chainRules[operand];
   if (lst) {
     // printf("\nChain from <%s> at cost #%s\n",operand, icost ? icost : "_");
     const char *result, *cost, *rule;
     for(lst->reset(); (lst->iter(result,cost,rule)) == true; ) {
       // Do not generate operands that are already available
       if( operands_chained_from[result] != NULL ) {
         continue;
       } else {
         // Compute the cost for previous match + chain_rule_cost
         // total_cost = icost + cost;
         Expr *total_cost = icost->clone();  // icost + cost
         total_cost->add(cost, *this);
         // Check for transitive chain rules
         Form *form = (Form *)_globalNames[rule];
         if ( ! form->is_instruction()) {
           // printf("   result=%s cost=%s rule=%s\n", result, total_cost, rule);
           // Check against other match costs, and update cost & rule vectors
           const char *reduce_rule = strcmp(irule,"Invalid") ? irule : rule;
           cost_check(fp, indent, ArchDesc::getMachOperEnum(result), total_cost, reduce_rule, status);
           chain_rule(fp, indent, result, total_cost, irule, operands_chained_from, status);
         } else {
           // printf("   result=%s cost=%s rule=%s\n", result, total_cost, rule);
           // Check against other match costs, and update cost & rule vectors
           cost_check(fp, indent, ArchDesc::getMachOperEnum(result), total_cost, rule, status);
           chain_rule(fp, indent, result, total_cost, rule, operands_chained_from, status);
         }
         // If this is a member of an operand class, update class cost & rule
         expand_opclass( fp, indent, total_cost, result, status );
       }
     }
   }
 }
 //---------------------------prune_matchlist-----------------------------------
 // Check for duplicate entries in a matchlist, and prune out the higher cost
 // entry.
 void ArchDesc::prune_matchlist(Dict &minimize, MatchList &mlist) {
 }
 //---------------------------buildDFA------------------------------------------
 // DFA is a large switch with case statements for each ideal opcode encountered
 // in any match rule in the ad file.  Each case has a series of if's to handle
 // the match or fail decisions.  The matches test the cost function of that
 // rule, and prune any cases which are higher cost for the same reduction.
 // In order to generate the DFA we walk the table of ideal opcode/MatchList
 // pairs generated by the ADLC front end to build the contents of the case
 // statements (a series of if statements).
 void ArchDesc::buildDFA(FILE* fp) {
   int i;
   // Remember operands that are the starting points for chain rules.
   // Prevent cycles by checking if we have already generated chain.
   Dict operands_chained_from(cmpstr, hashstr, Form::arena);
   // Hash inputs to match rules so that final DFA contains only one entry for
   // each match pattern which is the low cost entry.
   Dict minimize(cmpstr, hashstr, Form::arena);
   // Track status of dfa for each resulting production
   // reset for each ideal root.
   ProductionState status(Form::arena);
   // Output the start of the DFA method into the output file
   fprintf(fp, "\n");
   fprintf(fp, "//------------------------- Source -----------------------------------------\n");
   // Do not put random source code into the DFA.
   // If there are constants which need sharing, put them in "source_hpp" forms.
   // _source.output(fp);
   fprintf(fp, "\n");
   fprintf(fp, "//------------------------- Attributes -------------------------------------\n");
   _attributes.output(fp);
   fprintf(fp, "\n");
   fprintf(fp, "//------------------------- Macros -----------------------------------------\n");
   // #define DFA_PRODUCTION(result, rule, cost)\
   //   _cost[ (result) ] = cost; _rule[ (result) ] = rule;
   fprintf(fp, "#define %s(result, rule, cost)\\\n", dfa_production);
   fprintf(fp, "  _cost[ (result) ] = cost; _rule[ (result) ] = rule;\n");
   fprintf(fp, "\n");
   // #define DFA_PRODUCTION__SET_VALID(result, rule, cost)\
   //     DFA_PRODUCTION( (result), (rule), (cost) ); STATE__SET_VALID( (result) );
   fprintf(fp, "#define %s(result, rule, cost)\\\n", dfa_production_set_valid);
   fprintf(fp, "  %s( (result), (rule), (cost) ); STATE__SET_VALID( (result) );\n", dfa_production);
   fprintf(fp, "\n");
   fprintf(fp, "//------------------------- DFA --------------------------------------------\n");
   fprintf(fp,
 "// DFA is a large switch with case statements for each ideal opcode encountered\n"
 "// in any match rule in the ad file.  Each case has a series of if's to handle\n"
 "// the match or fail decisions.  The matches test the cost function of that\n"
 "// rule, and prune any cases which are higher cost for the same reduction.\n"
 "// In order to generate the DFA we walk the table of ideal opcode/MatchList\n"
 "// pairs generated by the ADLC front end to build the contents of the case\n"
 "// statements (a series of if statements).\n"
 );
   fprintf(fp, "\n");
   fprintf(fp, "\n");
   if (_dfa_small) {
     // Now build the individual routines just like the switch entries in large version
     // Iterate over the table of MatchLists, start at first valid opcode of 1
     for (i = 1; i < _last_opcode; i++) {
       if (_mlistab[i] == NULL) continue;
       // Generate the routine header statement for this opcode
       fprintf(fp, "void  State::_sub_Op_%s(const Node *n){\n", NodeClassNames[i]);
       // Generate body. Shared for both inline and out-of-line version
       gen_dfa_state_body(fp, minimize, status, operands_chained_from, i);
       // End of routine
       fprintf(fp, "}\n");
     }
   }
   fprintf(fp, "bool State::DFA");
   fprintf(fp, "(int opcode, const Node *n) {\n");
   fprintf(fp, "  switch(opcode) {\n");
   // Iterate over the table of MatchLists, start at first valid opcode of 1
   for (i = 1; i < _last_opcode; i++) {
     if (_mlistab[i] == NULL) continue;
     // Generate the case statement for this opcode
     if (_dfa_small) {
       fprintf(fp, "  case Op_%s: { _sub_Op_%s(n);\n", NodeClassNames[i], NodeClassNames[i]);
     } else {
       fprintf(fp, "  case Op_%s: {\n", NodeClassNames[i]);
       // Walk the list, compacting it
       gen_dfa_state_body(fp, minimize, status, operands_chained_from, i);
     }
     // Print the "break"
     fprintf(fp, "    break;\n");
     fprintf(fp, "  }\n");
   }
   // Generate the default case for switch(opcode)
   fprintf(fp, "  \n");
   fprintf(fp, "  default:\n");
   fprintf(fp, "    tty->print(\"Default case invoked for: \\n\");\n");
   fprintf(fp, "    tty->print(\"   opcode  = %cd, \\\"%cs\\\"\\n\", opcode, NodeClassNames[opcode]);\n", '%', '%');
   fprintf(fp, "    return false;\n");
   fprintf(fp, "  }\n");
   // Return status, indicating a successful match.
   fprintf(fp, "  return true;\n");
   // Generate the closing brace for method Matcher::DFA
   fprintf(fp, "}\n");
   Expr::check_buffers();
 }
 class dfa_shared_preds {
   enum { count = 4 };
   static bool        _found[count];
   static const char* _type [count];
   static const char* _var  [count];
   static const char* _pred [count];
   static void check_index(int index) { assert( 0 <= index && index < count, "Invalid index"); }
   // Confirm that this is a separate sub-expression.
   // Only need to catch common cases like " ... && shared ..."
   // and avoid hazardous ones like "...->shared"
   static bool valid_loc(char *pred, char *shared) {
     // start of predicate is valid
     if( shared == pred ) return true;
     // Check previous character and recurse if needed
     char *prev = shared - 1;
     char c  = *prev;
     switch( c ) {
     case ' ':
     case '\n':
       return dfa_shared_preds::valid_loc(pred, prev);
     case '!':
     case '(':
     case '<':
     case '=':
       return true;
     case '"':  // such as: #line 10 "myfile.ad"\n mypredicate
       return true;
     case '|':
       if( prev != pred && *(prev-1) == '|' ) return true;
     case '&':
       if( prev != pred && *(prev-1) == '&' ) return true;
     default:
       return false;
     }
     return false;
   }
 public:
   static bool        found(int index){ check_index(index); return _found[index]; }
   static void    set_found(int index, bool val) { check_index(index); _found[index] = val; }
   static void  reset_found() {
     for( int i = 0; i < count; ++i ) { _found[i] = false; }
   };
   static const char* type(int index) { check_index(index); return _type[index]; }
   static const char* var (int index) { check_index(index); return _var [index];  }
   static const char* pred(int index) { check_index(index); return _pred[index]; }
   // Check each predicate in the MatchList for common sub-expressions
   static void cse_matchlist(MatchList *matchList) {
     for( MatchList *mList = matchList; mList != NULL; mList = mList->get_next() ) {
       Predicate* predicate = mList->get_pred_obj();
       char*      pred      = mList->get_pred();
       if( pred != NULL ) {
         for(int index = 0; index < count; ++index ) {
           const char *shared_pred      = dfa_shared_preds::pred(index);
           const char *shared_pred_var  = dfa_shared_preds::var(index);
           bool result = dfa_shared_preds::cse_predicate(predicate, shared_pred, shared_pred_var);
           if( result ) dfa_shared_preds::set_found(index, true);
         }
       }
     }
   }
   // If the Predicate contains a common sub-expression, replace the Predicate's
   // string with one that uses the variable name.
   static bool cse_predicate(Predicate* predicate, const char *shared_pred, const char *shared_pred_var) {
     bool result = false;
     char *pred = predicate->_pred;
     if( pred != NULL ) {
       char *new_pred = pred;
       for( char *shared_pred_loc = strstr(new_pred, shared_pred);
       shared_pred_loc != NULL && dfa_shared_preds::valid_loc(new_pred,shared_pred_loc);
       shared_pred_loc = strstr(new_pred, shared_pred) ) {
         // Do not modify the original predicate string, it is shared
         if( new_pred == pred ) {
           new_pred = strdup(pred);
           shared_pred_loc = strstr(new_pred, shared_pred);
         }
         // Replace shared_pred with variable name
         strncpy(shared_pred_loc, shared_pred_var, strlen(shared_pred_var));
       }
       // Install new predicate
       if( new_pred != pred ) {
         predicate->_pred = new_pred;
         result = true;
       }
     }
     return result;
   }
   // Output the hoisted common sub-expression if we found it in predicates
   static void generate_cse(FILE *fp) {
     for(int j = 0; j < count; ++j ) {
       if( dfa_shared_preds::found(j) ) {
         const char *shared_pred_type = dfa_shared_preds::type(j);
         const char *shared_pred_var  = dfa_shared_preds::var(j);
         const char *shared_pred      = dfa_shared_preds::pred(j);
         fprintf(fp, "    %s %s = %s;\n", shared_pred_type, shared_pred_var, shared_pred);
       }
     }
   }
 };
 // shared predicates, _var and _pred entry should be the same length
 bool         dfa_shared_preds::_found[dfa_shared_preds::count]
   = { false, false, false, false };
 const char*  dfa_shared_preds::_type[dfa_shared_preds::count]
   = { "int", "jlong", "intptr_t", "bool" };
 const char*  dfa_shared_preds::_var [dfa_shared_preds::count]
   = { "_n_get_int__", "_n_get_long__", "_n_get_intptr_t__", "Compile__current____select_24_bit_instr__" };
 const char*  dfa_shared_preds::_pred[dfa_shared_preds::count]
   = { "n->get_int()", "n->get_long()", "n->get_intptr_t()", "Compile::current()->select_24_bit_instr()" };
 void ArchDesc::gen_dfa_state_body(FILE* fp, Dict &minimize, ProductionState &status, Dict &operands_chained_from, int i) {
   // Start the body of each Op_XXX sub-dfa with a clean state.
   status.initialize();
   // Walk the list, compacting it
   MatchList* mList = _mlistab[i];
   do {
     // Hash each entry using inputs as key and pointer as data.
     // If there is already an entry, keep the one with lower cost, and
     // remove the other one from the list.
     prune_matchlist(minimize, *mList);
     // Iterate
     mList = mList->get_next();
   } while(mList != NULL);
   // Hoist previously specified common sub-expressions out of predicates
   dfa_shared_preds::reset_found();
   dfa_shared_preds::cse_matchlist(_mlistab[i]);
   dfa_shared_preds::generate_cse(fp);
   mList = _mlistab[i];
   // Walk the list again, generating code
   do {
     // Each match can generate its own chains
     operands_chained_from.Clear();
     gen_match(fp, *mList, status, operands_chained_from);
     mList = mList->get_next();
   } while(mList != NULL);
   // Fill in any chain rules which add instructions
   // These can generate their own chains as well.
   operands_chained_from.Clear();  //
   if( debug_output1 ) { fprintf(fp, "// top level chain rules for: %s \n", (char *)NodeClassNames[i]); } // %%%%% Explanation
   const Expr *zeroCost = new Expr("0");
   chain_rule(fp, "   ", (char *)NodeClassNames[i], zeroCost, "Invalid",
              operands_chained_from, status);
 }
 //------------------------------Expr------------------------------------------
 Expr *Expr::_unknown_expr = NULL;
 char  Expr::string_buffer[STRING_BUFFER_LENGTH];
 char  Expr::external_buffer[STRING_BUFFER_LENGTH];
 bool  Expr::_init_buffers = Expr::init_buffers();
 Expr::Expr() {
   _external_name = NULL;
   _expr          = "Invalid_Expr";
   _min_value     = Expr::Max;
   _max_value     = Expr::Zero;
 }
 Expr::Expr(const char *cost) {
   _external_name = NULL;
   int intval = 0;
   if( cost == NULL ) {
     _expr = "0";
     _min_value = Expr::Zero;
     _max_value = Expr::Zero;
   }
   else if( ADLParser::is_int_token(cost, intval) ) {
     _expr = cost;
     _min_value = intval;
     _max_value = intval;
   }
   else {
     assert( strcmp(cost,"0") != 0, "Recognize string zero as an int");
     _expr = cost;
     _min_value = Expr::Zero;
     _max_value = Expr::Max;
   }
 }
 Expr::Expr(const char *name, const char *expression, int min_value, int max_value) {
   _external_name = name;
   _expr          = expression ? expression : name;
   _min_value     = min_value;
   _max_value     = max_value;
   assert(_min_value >= 0 && _min_value <= Expr::Max, "value out of range");
   assert(_max_value >= 0 && _max_value <= Expr::Max, "value out of range");
 }
 Expr *Expr::clone() const {
   Expr *cost = new Expr();
   cost->_external_name = _external_name;
   cost->_expr          = _expr;
   cost->_min_value     = _min_value;
   cost->_max_value     = _max_value;
   return cost;
 }
 void Expr::add(const Expr *c) {
   // Do not update fields until all computation is complete
   const char *external  = compute_external(this, c);
   const char *expr      = compute_expr(this, c);
   int         min_value = compute_min (this, c);
   int         max_value = compute_max (this, c);
   _external_name = external;
   _expr      = expr;
   _min_value = min_value;
   _max_value = max_value;
 }
 void Expr::add(const char *c) {
   Expr *cost = new Expr(c);
   add(cost);
 }
 void Expr::add(const char *c, ArchDesc &AD) {
   const Expr *e = AD.globalDefs()[c];
   if( e != NULL ) {
     // use the value of 'c' defined in <arch>.ad
     add(e);
   } else {
     Expr *cost = new Expr(c);
     add(cost);
   }
 }
 const char *Expr::compute_external(const Expr *c1, const Expr *c2) {
   const char * result = NULL;
   // Preserve use of external name which has a zero value
   if( c1->_external_name != NULL ) {
     sprintf( string_buffer, "%s", c1->as_string());
     if( !c2->is_zero() ) {
       strcat( string_buffer, "+");
       strcat( string_buffer, c2->as_string());
     }
     result = strdup(string_buffer);
   }
   else if( c2->_external_name != NULL ) {
     if( !c1->is_zero() ) {
       sprintf( string_buffer, "%s", c1->as_string());
       strcat( string_buffer, " + ");
     } else {
       string_buffer[0] = '\0';
     }
     strcat( string_buffer, c2->_external_name );
     result = strdup(string_buffer);
   }
   return result;
 }
 const char *Expr::compute_expr(const Expr *c1, const Expr *c2) {
   if( !c1->is_zero() ) {
     sprintf( string_buffer, "%s", c1->_expr);
     if( !c2->is_zero() ) {
       strcat( string_buffer, "+");
       strcat( string_buffer, c2->_expr);
     }
   }
   else if( !c2->is_zero() ) {
     sprintf( string_buffer, "%s", c2->_expr);
   }
   else {
     sprintf( string_buffer, "0");
   }
   char *cost = strdup(string_buffer);
   return cost;
 }
 int Expr::compute_min(const Expr *c1, const Expr *c2) {
   int result = c1->_min_value + c2->_min_value;
   assert( result >= 0, "Invalid cost computation");
   return result;
 }
 int Expr::compute_max(const Expr *c1, const Expr *c2) {
   int result = c1->_max_value + c2->_max_value;
   if( result < 0 ) {  // check for overflow
     result = Expr::Max;
   }
   return result;
 }
 void Expr::print() const {
   if( _external_name != NULL ) {
     printf("  %s == (%s) === [%d, %d]\n", _external_name, _expr, _min_value, _max_value);
   } else {
     printf("  %s === [%d, %d]\n", _expr, _min_value, _max_value);
   }
 }
 void Expr::print_define(FILE *fp) const {
   assert( _external_name != NULL, "definition does not have a name");
   assert( _min_value == _max_value, "Expect user definitions to have constant value");
   fprintf(fp, "#define  %s  (%s)  \n", _external_name, _expr);
   fprintf(fp, "// value == %d \n", _min_value);
 }
 void Expr::print_assert(FILE *fp) const {
   assert( _external_name != NULL, "definition does not have a name");
   assert( _min_value == _max_value, "Expect user definitions to have constant value");
   fprintf(fp, "  assert( %s == %d, \"Expect (%s) to equal %d\");\n", _external_name, _min_value, _expr, _min_value);
 }
 Expr *Expr::get_unknown() {
   if( Expr::_unknown_expr == NULL ) {
     Expr::_unknown_expr = new Expr();
   }
   return Expr::_unknown_expr;
 }
 bool Expr::init_buffers() {
   // Fill buffers with 0
   for( int i = 0; i < STRING_BUFFER_LENGTH; ++i ) {
     external_buffer[i] = '\0';
     string_buffer[i]   = '\0';
   }
   return true;
 }
 bool Expr::check_buffers() {
   // returns 'true' if buffer use may have overflowed
   bool ok = true;
   for( int i = STRING_BUFFER_LENGTH - 100; i < STRING_BUFFER_LENGTH; ++i) {
     if( external_buffer[i] != '\0' || string_buffer[i]   != '\0' ) {
       ok = false;
       assert( false, "Expr:: Buffer overflow");
     }
   }
   return ok;
 }
 //------------------------------ExprDict---------------------------------------
 // Constructor
 ExprDict::ExprDict( CmpKey cmp, Hash hash, Arena *arena )
   : _expr(cmp, hash, arena), _defines()  {
 }
 ExprDict::~ExprDict() {
 }
 // Return # of name-Expr pairs in dict
 int ExprDict::Size(void) const {
   return _expr.Size();
 }
 // define inserts the given key-value pair into the dictionary,
 // and records the name in order for later output, ...
 const Expr  *ExprDict::define(const char *name, Expr *expr) {
   const Expr *old_expr = (*this)[name];
   assert(old_expr == NULL, "Implementation does not support redefinition");
   _expr.Insert(name, expr);
   _defines.addName(name);
   return old_expr;
 }
 // Insert inserts the given key-value pair into the dictionary.  The prior
 // value of the key is returned; NULL if the key was not previously defined.
 const Expr  *ExprDict::Insert(const char *name, Expr *expr) {
   return (Expr*)_expr.Insert((void*)name, (void*)expr);
 }
 // Finds the value of a given key; or NULL if not found.
 // The dictionary is NOT changed.
 const Expr  *ExprDict::operator [](const char *name) const {
   return (Expr*)_expr[name];
 }
 void ExprDict::print_defines(FILE *fp) {
   fprintf(fp, "\n");
   const char *name = NULL;
   for( _defines.reset(); (name = _defines.iter()) != NULL; ) {
     const Expr *expr = (const Expr*)_expr[name];
     assert( expr != NULL, "name in ExprDict without matching Expr in dictionary");
     expr->print_define(fp);
   }
 }
 void ExprDict::print_asserts(FILE *fp) {
   fprintf(fp, "\n");
   fprintf(fp, "  // Following assertions generated from definition section\n");
   const char *name = NULL;
   for( _defines.reset(); (name = _defines.iter()) != NULL; ) {
     const Expr *expr = (const Expr*)_expr[name];
     assert( expr != NULL, "name in ExprDict without matching Expr in dictionary");
     expr->print_assert(fp);
   }
 }
 // Print out the dictionary contents as key-value pairs
 static void dumpekey(const void* key)  { fprintf(stdout, "%s", (char*) key); }
 static void dumpexpr(const void* expr) { fflush(stdout); ((Expr*)expr)->print(); }
 void ExprDict::dump() {
   _expr.print(dumpekey, dumpexpr);
 }
 //------------------------------ExprDict::private------------------------------
 // Disable public use of constructor, copy-ctor, operator =, operator ==
 ExprDict::ExprDict( ) : _expr(cmpkey,hashkey), _defines()  {
   assert( false, "NotImplemented");
 }
 ExprDict::ExprDict( const ExprDict & ) : _expr(cmpkey,hashkey), _defines() {
   assert( false, "NotImplemented");
 }
 ExprDict &ExprDict::operator =( const ExprDict &rhs) {
   assert( false, "NotImplemented");
   _expr = rhs._expr;
   return *this;
 }
 // == compares two dictionaries; they must have the same keys (their keys
 // must match using CmpKey) and they must have the same values (pointer
 // comparison).  If so 1 is returned, if not 0 is returned.
 bool ExprDict::operator ==(const ExprDict &d) const {
   assert( false, "NotImplemented");
   return false;
 }
 //------------------------------Production-------------------------------------
 Production::Production(const char *result, const char *constraint, const char *valid) {
   initialize();
   _result     = result;
   _constraint = constraint;
   _valid      = valid;
 }
 void Production::initialize() {
   _result     = NULL;
   _constraint = NULL;
   _valid      = knownInvalid;
   _cost_lb    = Expr::get_unknown();
   _cost_ub    = Expr::get_unknown();
 }
 void Production::print() {
   printf("%s", (_result     == NULL ? "NULL" : _result ) );
   printf("%s", (_constraint == NULL ? "NULL" : _constraint ) );
   printf("%s", (_valid      == NULL ? "NULL" : _valid ) );
   _cost_lb->print();
   _cost_ub->print();
 }
 //------------------------------ProductionState--------------------------------
 void ProductionState::initialize() {
   _constraint = noConstraint;
   // reset each Production currently in the dictionary
   DictI iter( &_production );
   const void *x, *y = NULL;
   for( ; iter.test(); ++iter) {
     x = iter._key;
     y = iter._value;
     Production *p = (Production*)y;
     if( p != NULL ) {
       p->initialize();
     }
   }
 }
 Production *ProductionState::getProduction(const char *result) {
   Production *p = (Production *)_production[result];
   if( p == NULL ) {
     p = new Production(result, _constraint, knownInvalid);
     _production.Insert(result, p);
   }
   return p;
 }
 void ProductionState::set_constraint(const char *constraint) {
   _constraint = constraint;
 }
 const char *ProductionState::valid(const char *result) {
   return getProduction(result)->valid();
 }
 void ProductionState::set_valid(const char *result) {
   Production *p = getProduction(result);
   // Update valid as allowed by current constraints
   if( _constraint == noConstraint ) {
     p->_valid = knownValid;
   } else {
     if( p->_valid != knownValid ) {
       p->_valid = unknownValid;
     }
   }
 }
 Expr *ProductionState::cost_lb(const char *result) {
   return getProduction(result)->cost_lb();
 }
 Expr *ProductionState::cost_ub(const char *result) {
   return getProduction(result)->cost_ub();
 }
 void ProductionState::set_cost_bounds(const char *result, const Expr *cost, bool has_state_check, bool has_cost_check) {
   Production *p = getProduction(result);
   if( p->_valid == knownInvalid ) {
     // Our cost bounds are not unknown, just not defined.
     p->_cost_lb = cost->clone();
     p->_cost_ub = cost->clone();
   } else if (has_state_check || _constraint != noConstraint) {
     // The production is protected by a condition, so
     // the cost bounds may expand.
     // _cost_lb = min(cost, _cost_lb)
     if( cost->less_than_or_equal(p->_cost_lb) ) {
       p->_cost_lb = cost->clone();
     }
     // _cost_ub = max(cost, _cost_ub)
     if( p->_cost_ub->less_than_or_equal(cost) ) {
       p->_cost_ub = cost->clone();
     }
   } else if (has_cost_check) {
     // The production has no condition check, but does
     // have a cost check that could reduce the upper
     // and/or lower bound.
     // _cost_lb = min(cost, _cost_lb)
     if( cost->less_than_or_equal(p->_cost_lb) ) {
       p->_cost_lb = cost->clone();
     }
     // _cost_ub = min(cost, _cost_ub)
     if( cost->less_than_or_equal(p->_cost_ub) ) {
       p->_cost_ub = cost->clone();
     }
   } else {
     // The costs are unconditionally set.
     p->_cost_lb = cost->clone();
     p->_cost_ub = cost->clone();
   }
 }
 // Print out the dictionary contents as key-value pairs
 static void print_key (const void* key)              { fprintf(stdout, "%s", (char*) key); }
 static void print_production(const void* production) { fflush(stdout); ((Production*)production)->print(); }
 void ProductionState::print() {
   _production.print(print_key, print_production);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/adlc/dfa.cpp@2c6ef90f030a (annotated)

src/share/vm/adlc/dfa.cpp