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Dear LLVM, When I use analyze to construct the DSGraph for the lists.c program in test/Programs/SingleSource/Shootout directory. I found out the heap node in the function test_list() all have type FOLDED:R. I was wondering why it's not heapnode anymore? My pass need to use this type information to determine whether a node is heap node. Is there any way I can know this is a heap node in this case? Thanks, xiaodong

Is there some efficient way to find the malloc instructions which point to the memory represented by a DSNode? Right now the only way I see is by iterating through the value map in the DSGraph object and finding every value that points to my DSNode. A possibly related question: is there a way to tell that the node has been merged, and if so, what types of nodes went into the merge? Thanks,

...ov 2002, Chris Lattner wrote: > > When I use analyze to construct the DSGraph for the lists.c program in > > test/Programs/SingleSource/Shootout directory. I found out the heap node > > in the function test_list() all have type FOLDED:R. I was wondering why > > it's not heapnode anymore? My pass need to use this type information to > > determine whether a node is heap node. Is there any way I can know this is > > a heap node in this case? > > Folded nodes are nodes where the type information in LLVM isn't good > enough to distinguish fields, there...

...roblem. Sorry :) > A possibly related question: is there a way to tell that the node has > been merged, and if so, what types of nodes went into the merge? Yup, DSNode::NodeType contains flags for the node. There are four flags that indicate the composition of the node: DSNode::AllocaNode, HeapNode, GlobalNode, UnknownNode. When two nodes are merged, their Flags are bitwise or'd together... -Chris -- http://llvm.cs.uiuc.edu/ http://www.nondot.org/~sabre/Projects/

> When I use analyze to construct the DSGraph for the lists.c program in > test/Programs/SingleSource/Shootout directory. I found out the heap node > in the function test_list() all have type FOLDED:R. I was wondering why > it's not heapnode anymore? My pass need to use this type information to > determine whether a node is heap node. Is there any way I can know this is > a heap node in this case? Folded nodes are nodes where the type information in LLVM isn't good enough to distinguish fields, therefore we need to fold the...

...gt; A possibly related question: is there a way to tell that the node has > > been merged, and if so, what types of nodes went into the merge? > > Yup, DSNode::NodeType contains flags for the node. There are four flags > that indicate the composition of the node: DSNode::AllocaNode, HeapNode, > GlobalNode, UnknownNode. > > When two nodes are merged, their Flags are bitwise or'd together... I realized that, but what if two nodes of the same type are merged? Their flags will not indicate that a merge has occurred. I'm concerned about the case where two malloc nodes a...