Class MethodModel

java.lang.Object
com.aparapi.internal.model.MethodModel
public class MethodModel extends Object

  • Method Details

    • isGetter

      public boolean isGetter()

    • isSetter

      public boolean isSetter()

    • methodUsesPutfield

      public boolean methodUsesPutfield()

    • isNoCL

      public boolean isNoCL()

    • isPrivateMemoryGetter

      public boolean isPrivateMemoryGetter()

    • getMethod

      public ClassModel.ClassModelMethod getMethod()

    • getAccessorVariableFieldEntry

      public ClassModel.ConstantPool.FieldEntry getAccessorVariableFieldEntry()

    • getCalledMethods

      public Set<MethodModel> getCalledMethods()

    • checkForRecursion

      public void checkForRecursion(Set<MethodModel> transitiveCalledMethods) throws AparapiException
      Throws:
      AparapiException

    • setRequiredPragmas

      public void setRequiredPragmas(Instruction instruction)
      Look at each instruction for use of long/double or byte writes which require pragmas to be used in the OpenCL source

    • requiresDoublePragma

      public boolean requiresDoublePragma()

    • requiresByteAddressableStorePragma

      public boolean requiresByteAddressableStorePragma()

    • createListOfInstructions

      public Map<Integer, Instruction> createListOfInstructions() throws ClassParseException
      Create a linked list of instructions (from pcHead to pcTail). Returns a map of int (pc) to Instruction which to allow us to quickly get from a bytecode offset to the appropriate instruction. Note that not all int values from 0 to code.length values will map to a valid instruction, if pcMap.get(n) == null then this implies that 'n' is not the start of an instruction So either pcMap.get(i)== null or pcMap.get(i).getThisPC()==i
      Returns:
      Mapinvalid input: '<'Integer, Instruction> the returned pc to Instruction map
      Throws:
      ClassParseException

    • buildBranchGraphs

      public void buildBranchGraphs(Map<Integer, Instruction> pcMap)
      Here we connect the branch nodes to the instruction that they branch to.

      Each branch node contains a 'target' field indended to reference the node that the branch targets. Each instruction also contain four seperate lists of branch nodes that reference it. These lists hold forwardConditional, forwardUnconditional, reverseConditional and revereseUnconditional branches that reference it.

      So assuming that we had a branch node at pc offset 100 which represented 'goto 200'.

      Following this call the branch node at pc offset 100 will have a 'target' field which actually references the instruction at pc offset 200, and the instruction at pc offset 200 will have the branch node (at 100) added to it's forwardUnconditional list.

      See Also:

    • deoptimizeReverseBranches

      public void deoptimizeReverseBranches()
      Javac optimizes some branches to avoid goto->goto, branch->goto etc. This method specifically deals with reverse branches which are the result of such optimisations.

    • txFormDups

      public void txFormDups(ExpressionList _expressionList, Instruction _instruction) throws ClassParseException
      DUP family of instructions break our stack unwind model (whereby we treat instructions like the oeprands they create/consume).

      Here we replace DUP style instructions with a 'mock' instruction which 'clones' the effect of the instruction. This would be invalid to execute but is useful to replace the DUP with a 'pattern' which it simulates. This allows us to later apply transforms to represent the original code.

      An example might be the bytecode for the following sequence. 

         results[10]++; 
        return
      Which results in the following bytecode 
           0:   aload_0       // reference through 'this' to get 
     1:   getfield      // field 'results' which is an array of int
     4:   bipush  10    // push the array index
     6:   dup2          // dreaded dup2 we'll come back here
     7:   iaload        // ignore for the moment.
     8:   iconst_1
     9:   iadd
     10:  iastore
     11:  return
      First we need to know what the stack will look like before the dup2 is encountered. Using our folding technique we represent the first two instructions inside () 
                getfield (aload_0     // result in the array field reference on stack
          bipush  10            // the array index
          dup2                  // dreaded dup2 we'll come back here
      The dup2 essentially copies the top two elements on the stack. So we emulate this by replacing the dup2 with clones of the instructions which would reinstate the same stack state.

      So after the dup2 transform we end up with:- 

               getfield (aload_0)     // result in the array field reference on stack
         bipush  10             // the array index
         {getfield (aload_0)}   // result in the array field reference on stack
         {bipush 10}            // the array index
      So carrying on lets look at the iaload which consumes two operands (the index and the array field reference) and creates one (the result of an array access) 
               getfield (aload_0)     // result in the array field reference on stack
         bipush  10             // the array index
         {getfield (aload_0)}   // result in the array field reference on stack
         {bipush  10}           // the array index
         iaload
      So we now have 
               getfield (aload_0)                        // result in the array field reference on stack
         bipush  10                                // the array index
         iaload ({getfield(aload_0), {bipush 10})  // results in the array element on the stack
         iconst
         iadd
      And if you are following along the iadd will fold the previous two stack entries essentially pushing the result of results[10]+1 on the stack. 
               getfield (aload_0)                                        // result in the array field reference on stack
         bipush  10                                                // the array index
         iadd (iaload ({getfield(aload_0), {bipush 10}, iconst_1)  // push of results[10]+1
      Then the final istore instruction which consumes 3 stack operands (the field array reference, the index and the value to assign).

      Which results in 

       
         istore (getfield (aload_0), bipush 10,  iadd (iaload ({getfield(aload_0), {bipush 10}, iconst_1)) // results[10] = results[10+1]
      Where results[10] = results[10+1] is the long-hand form of the results[10]++ and will be transformed by one of the 'inc' transforms to the more familiar form a little later.
      Parameters:
      _expressionList -
      _instruction -
      Throws:
      ClassParseException

    • getLocalVariableTableEntry

      public ClassModel.LocalVariableTableEntry<ClassModel.LocalVariableInfo> getLocalVariableTableEntry()

    • getConstantPool

      public ClassModel.ConstantPool getConstantPool()

    • getLocalVariable

      public ClassModel.LocalVariableInfo getLocalVariable(int _pc, int _index)

    • getSimpleName

      public String getSimpleName()

    • getName

      public String getName()

    • getReturnType

      public String getReturnType()

    • getMethodCalls

      public List<InstructionSet.MethodCall> getMethodCalls()

    • getPCHead

      public Instruction getPCHead()

    • getExprHead

      public Instruction getExprHead()

    • toString

      public String toString()
      Overrides:
      toString in class Object

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