void
RemoveConstantFoldedValueViaParent::visit ( SgNode* node )
{
// This is an alternative implementation that allows us to handle expression that are not
// traversed in the AST (e.g. types like SgArrayType which can contain expressions).
ROSE_ASSERT(node != NULL);
// DQ (3/11/2006): Set NULL pointers where we would like to have none.
#if 0
printf ("In RemoveConstantFoldedValueViaParent::visit(): node = %p = %s \n",node,node->class_name().c_str());
#endif
// DQ (10/12/2012): Turn this on so that we can detect failing IR nodes (failing later) that have valid originalExpressionTrees.
// DQ (10/12/2012): Turn this back off because it appears to fail...
#if 0
SgExpression* exp = isSgExpression(node);
if (exp != NULL)
{
SgExpression* originalExpressionTree = exp->get_originalExpressionTree();
if (originalExpressionTree != NULL)
{
SgNode* parent = exp->get_parent();
if (parent != NULL)
{
printf ("Current IR node with SgExpression parent = %p = %s child = %p = %s originalExpressionTree = %p = %s \n",parent,parent->class_name().c_str(),node,node->class_name().c_str(),originalExpressionTree,originalExpressionTree->class_name().c_str());
bool traceReplacement = true;
ConstantFoldedValueReplacer r(traceReplacement, exp);
parent->processDataMemberReferenceToPointers(&r);
// node->processDataMemberReferenceToPointers(&r);
}
// Set the originalExpressionTree to NULL.
exp->set_originalExpressionTree(NULL);
// Set the parent of originalExpressionTree to be the parent of exp.
originalExpressionTree->set_parent(parent);
// And then delete the folded constant.
SageInterface::deleteAST(exp);
}
}
#endif
SgArrayType* arrayType = isSgArrayType(node);
if (arrayType != NULL)
{
#if 0
printf ("Found an array type arrayType = %p arrayType->get_index() = %p \n",arrayType,arrayType->get_index());
#endif
SgExpression* index = arrayType->get_index();
if (index != NULL)
{
#if 0
printf ("Fixup array index = %p = %s (traverse index AST subtree) \n",index,index->class_name().c_str());
#endif
RemoveConstantFoldedValue astFixupTraversal;
astFixupTraversal.traverse(index);
#if 0
printf ("DONE: Fixup array index = %p (traverse index AST) \n\n\n\n",index);
#endif
#if 0
printf ("Found an array index = %p (fixup index directly) \n",index);
#endif
// Handle the case where the original expression tree is at the root of the subtree.
SgExpression* originalExpressionTree = index->get_originalExpressionTree();
if (originalExpressionTree != NULL)
{
#if 0
printf ("Found an originalExpressionTree in the array index originalExpressionTree = %p \n",originalExpressionTree);
#endif
// DQ (6/12/2013): This appears to be a problem in EDG 4.7 (see test2011_117.C).
std::vector<SgExpression*> redundantChainOfOriginalExpressionTrees;
if (originalExpressionTree->get_originalExpressionTree() != NULL)
{
#if 0
printf ("Detected originalExpressionTree nested directly within the originalExpressionTree \n",
originalExpressionTree,originalExpressionTree->class_name().c_str(),
originalExpressionTree->get_originalExpressionTree(),originalExpressionTree->get_originalExpressionTree()->class_name().c_str());
#endif
// Loop to the end of the chain of original expressions (which EDG 4.7 should never have constructed).
while (originalExpressionTree->get_originalExpressionTree() != NULL)
{
#if 0
printf ("Looping through a chain of originalExpressionTrees \n");
#endif
// Save the list of redundnat nodes so that we can delete them properly.
redundantChainOfOriginalExpressionTrees.push_back(originalExpressionTree);
originalExpressionTree = originalExpressionTree->get_originalExpressionTree();
}
#if 0
printf ("Exiting as a test! \n");
ROSE_ASSERT(false);
#endif
}
arrayType->set_index(originalExpressionTree);
originalExpressionTree->set_parent(arrayType);
index->set_originalExpressionTree(NULL);
// printf ("DEBUGING: skip delete of index in array type \n");
delete index;
// DQ (6/12/2013): Delete the nodes that we had to skip over (caused by chain of redundant entries from EDG 4.7).
std::vector<SgExpression*>::iterator i = redundantChainOfOriginalExpressionTrees.begin();
while (i != redundantChainOfOriginalExpressionTrees.end())
{
#if 0
printf ("deleting the redundnat originalExpressionTree chain caused by EDG 4.7 (delete %p = %s) \n",*i,(*i)->class_name().c_str());
#endif
delete *i;
i++;
}
index = NULL;
}
}
}
SgVariableDefinition* variableDefinition = isSgVariableDefinition(node);
if (variableDefinition != NULL)
{
#if 0
printf ("Found a SgVariableDefinition \n");
#endif
SgExpression* bitfieldExp = variableDefinition->get_bitfield();
if (bitfieldExp != NULL)
{
#if 0
printf ("Fixup bitfieldExp = %p (traverse bitfieldExp AST subtree) \n",bitfieldExp);
#endif
RemoveConstantFoldedValue astFixupTraversal;
astFixupTraversal.traverse(bitfieldExp);
// Handle the case where the original expression tree is at the root of the subtree.
SgExpression* originalExpressionTree = bitfieldExp->get_originalExpressionTree();
if (originalExpressionTree != NULL)
{
#if 0
// DQ (9/18/2011): This code will not work since the bitfile data member in SgVariableDefinition is a SgUnsignedLongVal instead of a SgExpression.
variableDefinition->set_bitfield(originalExpressionTree);
originalExpressionTree->set_parent(variableDefinition);
bitfieldExp->set_originalExpressionTree(NULL);
delete bitfieldExp;
bitfieldExp = NULL;
#else
// The ROSE AST needs to be fixed to handle more general expressions for bitfield widths (this does not effect the CFG).
// TODO: Change the data type of the bitfield data member in SgVariableDefinition.
// DQ (1/20/2014): This has been done now.
// printf ("Member data bitfield widths need to be changed (in the ROSE IR) to support more general expressions (can't fix this original expression tree) \n");
#endif
#if 0
// This case is not handled yet!
printf ("Found an original expression tree in a bitfield expression \n");
ROSE_ASSERT(false);
#endif
}
}
}
}
void
ConstantFoldedValueReplacer::operator()(SgNode*& key, const SgName & debugStringName, bool /* traverse */ traceReplacement)
{
// This function is used to replace the expression in an AST node and avoids explicitly handling all of the cases
// of where an IR node can exist in the AST (in this case expressions containing an opriginal expression tree could
// be in a lot of locations).
// Note that the key will be a reference to the pointer for each data member of the IR node where:
// node->processDataMemberReferenceToPointers(&r);
// is called.
#if 0
printf ("Inside of ConstantFoldedValueReplacer::operator() key = %p = %s = %s node = %p = %s = %s \n",
key,(key != NULL) ? key->class_name().c_str() : "NULL",(key != NULL) ? SageInterface::get_name(key).c_str() : "NULL",
targetNode,(targetNode != NULL) ? targetNode->class_name().c_str() : "NULL",(targetNode != NULL) ? SageInterface::get_name(targetNode).c_str() : "NULL");
#endif
if (key != NULL)
{
// Now reset the pointer to the subtree identified as redundent with a
// subtree in the original AST to the subtree in the original (merged) AST.
// Note: targetNode is the IR node to be replaced (set in the ConstantFoldedValueReplacer constructor call).
if (key == targetNode)
{
#if 0
printf ("Note that key == originalNode \n");
#endif
SgExpression* keyExpression = isSgExpression(key);
// DQ (9/17/2011): We don't want to eliminate references to enum values (see test2005_194.C).
// Though I wonder if it could be that we are not distinguishing the enum value and the
// values of the enum variables (the order of the fields in the enum declaration).
if (isSgEnumVal(keyExpression) == NULL)
{
if (keyExpression != NULL)
{
#if 0
printf ("Note that key is a valid expression keyExpression->get_originalExpressionTree() = %p \n",keyExpression->get_originalExpressionTree());
#endif
if (keyExpression->get_originalExpressionTree() != NULL)
{
#if 0
printf ("key contains a originalExpressionTree = %p = %s \n",keyExpression->get_originalExpressionTree(),keyExpression->get_originalExpressionTree()->class_name().c_str());
#endif
// DQ (10/8/2011): Added support for chains of expression trees.
// while (keyExpression->get_originalExpressionTree()->get_originalExpressionTree() != NULL)
while (keyExpression->get_originalExpressionTree()->get_originalExpressionTree() != NULL && isSgEnumVal(keyExpression->get_originalExpressionTree()) == NULL)
{
SgExpression* nestedOriginalExpressionTree = keyExpression->get_originalExpressionTree();
ROSE_ASSERT(nestedOriginalExpressionTree != NULL);
#if 0
printf ("Found a chain of original expression trees (iterate to find the end of the chain: keyExpression = %p = %s keyExpression->get_originalExpressionTree() = %p = %s \n",
keyExpression,keyExpression->class_name().c_str(),nestedOriginalExpressionTree,nestedOriginalExpressionTree->class_name().c_str());
#endif
keyExpression = nestedOriginalExpressionTree;
}
// If this is an enum value, then we don't want the original expression tree (which
// will otherwise be substituted into such places as SgCaseOptionStmt nodes, etc.).
SgEnumVal* enumValue = isSgEnumVal(keyExpression->get_originalExpressionTree());
if (enumValue != NULL)
{
#if 0
printf ("Detected case of enumValue = %p \n",enumValue);
#endif
if (enumValue->get_originalExpressionTree())
{
#if 0
printf ("Deleting the original expression in the nested enumValue \n");
#endif
deleteOriginalExpressionTree(enumValue->get_originalExpressionTree());
enumValue->set_originalExpressionTree(NULL);
}
}
ROSE_ASSERT(keyExpression->get_originalExpressionTree() != NULL);
key = keyExpression->get_originalExpressionTree();
ROSE_ASSERT(key != NULL);
// Set the parent node
ROSE_ASSERT(keyExpression->get_originalExpressionTree() != NULL);
keyExpression->get_originalExpressionTree()->set_parent(targetNode->get_parent());
SgExpression* targetExpression = isSgExpression(targetNode);
// Clear the originalExpressionTree
targetExpression->set_originalExpressionTree(NULL);
ROSE_ASSERT(targetExpression->get_originalExpressionTree() == NULL);
targetExpression->set_parent(NULL);
// DQ (9/24/2011): This can be an expression tree (more than just a single IR node (see test2011_140.C).
// delete targetNode;
SageInterface::deleteAST(targetExpression);
// Reset the pointer to avoid any dangling pointer problems.
targetNode = NULL;
}
}
else
{
#if 0
printf ("key is not a SgExpression \n");
#endif
}
}
else
{
// For the case of a SgEnumVal, don't use the original expression tree (see test2005_194.C)
// The original expression tree holds the value used for the enum field, instead of the
// reference to the correct enum field).
#if 0
printf ("ENUM VALUE special handling: we call deleteOriginalExpressionTree(keyExpression = %p) \n",keyExpression);
#endif
deleteOriginalExpressionTree(keyExpression);
}
}
else
{
#if 0
printf ("key != originalNode \n");
#endif
}
}
else
{
#if 0
printf ("key == NULL \n");
#endif
}
#if 0
printf ("Leaving ConstantFoldedValueReplacer::operator() new reset key = %p = %s \n",key,(key != NULL) ? key->class_name().c_str() : "NULL");
#endif
}