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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef DALVIK_VM_LOOP_H_
     18 #define DALVIK_VM_LOOP_H_
     19 
     20 #include "Dalvik.h"
     21 #include "CompilerInternals.h"
     22 
     23 typedef struct LoopAnalysis {
     24     BitVector *isIndVarV;               // length == numSSAReg
     25     GrowableList *ivList;               // induction variables
     26     GrowableList *arrayAccessInfo;      // hoisted checks for array accesses
     27     int numBasicIV;                     // number of basic induction variables
     28     int ssaBIV;                         // basic IV in SSA name
     29     bool isCountUpLoop;                 // count up or down loop
     30     Opcode loopBranchOpcode;            // OP_IF_XXX for the loop back branch
     31     int endConditionReg;                // vB in "vA op vB"
     32     LIR *branchToBody;                  // branch over to the body from entry
     33     LIR *branchToPCR;                   // branch over to the PCR cell
     34     bool bodyIsClean;                   // loop body cannot throw any exceptions
     35 } LoopAnalysis;
     36 
     37 bool dvmCompilerFilterLoopBlocks(CompilationUnit *cUnit);
     38 
     39 /*
     40  * An unexecuted code path may contain unresolved fields or classes. Before we
     41  * have a quiet resolver we simply bail out of the loop compilation mode.
     42  */
     43 #define BAIL_LOOP_COMPILATION() if (cUnit->jitMode == kJitLoop) {       \
     44                                     cUnit->quitLoopMode = true;         \
     45                                     return false;                       \
     46                                 }
     47 
     48 #endif  // DALVIK_VM_LOOP_H_
     49