mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
7a31285c3f
structured access to the globals list, add a couple helper methods. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10982 91177308-0d34-0410-b5e6-96231b3b80d8
410 lines
15 KiB
C++
410 lines
15 KiB
C++
//===- DSNode.h - Node definition for datastructure graphs ------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Data structure graph nodes and some implementation of DSNodeHandle.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_DSNODE_H
|
|
#define LLVM_ANALYSIS_DSNODE_H
|
|
|
|
#include "llvm/Analysis/DSSupport.h"
|
|
|
|
namespace llvm {
|
|
|
|
template<typename BaseType>
|
|
class DSNodeIterator; // Data structure graph traversal iterator
|
|
class TargetData;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// DSNode - Data structure node class
|
|
///
|
|
/// This class represents an untyped memory object of Size bytes. It keeps
|
|
/// track of any pointers that have been stored into the object as well as the
|
|
/// different types represented in this object.
|
|
///
|
|
class DSNode {
|
|
/// NumReferrers - The number of DSNodeHandles pointing to this node... if
|
|
/// this is a forwarding node, then this is the number of node handles which
|
|
/// are still forwarding over us.
|
|
///
|
|
unsigned NumReferrers;
|
|
|
|
/// ForwardNH - This NodeHandle contain the node (and offset into the node)
|
|
/// that this node really is. When nodes get folded together, the node to be
|
|
/// eliminated has these fields filled in, otherwise ForwardNH.getNode() is
|
|
/// null.
|
|
DSNodeHandle ForwardNH;
|
|
|
|
/// Size - The current size of the node. This should be equal to the size of
|
|
/// the current type record.
|
|
///
|
|
unsigned Size;
|
|
|
|
/// ParentGraph - The graph this node is currently embedded into.
|
|
///
|
|
DSGraph *ParentGraph;
|
|
|
|
/// Ty - Keep track of the current outer most type of this object, in addition
|
|
/// to whether or not it has been indexed like an array or not. If the
|
|
/// isArray bit is set, the node cannot grow.
|
|
///
|
|
const Type *Ty; // The type itself...
|
|
|
|
/// Links - Contains one entry for every sizeof(void*) bytes in this memory
|
|
/// object. Note that if the node is not a multiple of size(void*) bytes
|
|
/// large, that there is an extra entry for the "remainder" of the node as
|
|
/// well. For this reason, nodes of 1 byte in size do have one link.
|
|
///
|
|
std::vector<DSNodeHandle> Links;
|
|
|
|
/// Globals - The list of global values that are merged into this node.
|
|
///
|
|
std::vector<GlobalValue*> Globals;
|
|
|
|
void operator=(const DSNode &); // DO NOT IMPLEMENT
|
|
DSNode(const DSNode &); // DO NOT IMPLEMENT
|
|
public:
|
|
enum NodeTy {
|
|
ShadowNode = 0, // Nothing is known about this node...
|
|
AllocaNode = 1 << 0, // This node was allocated with alloca
|
|
HeapNode = 1 << 1, // This node was allocated with malloc
|
|
GlobalNode = 1 << 2, // This node was allocated by a global var decl
|
|
UnknownNode = 1 << 3, // This node points to unknown allocated memory
|
|
Incomplete = 1 << 4, // This node may not be complete
|
|
|
|
Modified = 1 << 5, // This node is modified in this context
|
|
Read = 1 << 6, // This node is read in this context
|
|
|
|
Array = 1 << 7, // This node is treated like an array
|
|
//#ifndef NDEBUG
|
|
DEAD = 1 << 8, // This node is dead and should not be pointed to
|
|
//#endif
|
|
|
|
Composition = AllocaNode | HeapNode | GlobalNode | UnknownNode,
|
|
};
|
|
|
|
/// NodeType - A union of the above bits. "Shadow" nodes do not add any flags
|
|
/// to the nodes in the data structure graph, so it is possible to have nodes
|
|
/// with a value of 0 for their NodeType.
|
|
///
|
|
private:
|
|
unsigned short NodeType;
|
|
public:
|
|
|
|
/// DSNode ctor - Create a node of the specified type, inserting it into the
|
|
/// specified graph.
|
|
DSNode(const Type *T, DSGraph *G);
|
|
|
|
/// DSNode "copy ctor" - Copy the specified node, inserting it into the
|
|
/// specified graph. If NullLinks is true, then null out all of the links,
|
|
/// but keep the same number of them. This can be used for efficiency if the
|
|
/// links are just going to be clobbered anyway.
|
|
DSNode(const DSNode &, DSGraph *G, bool NullLinks = false);
|
|
|
|
~DSNode() {
|
|
dropAllReferences();
|
|
assert(hasNoReferrers() && "Referrers to dead node exist!");
|
|
}
|
|
|
|
// Iterator for graph interface... Defined in DSGraphTraits.h
|
|
typedef DSNodeIterator<DSNode> iterator;
|
|
typedef DSNodeIterator<const DSNode> const_iterator;
|
|
inline iterator begin();
|
|
inline iterator end();
|
|
inline const_iterator begin() const;
|
|
inline const_iterator end() const;
|
|
|
|
//===--------------------------------------------------
|
|
// Accessors
|
|
|
|
/// getSize - Return the maximum number of bytes occupied by this object...
|
|
///
|
|
unsigned getSize() const { return Size; }
|
|
|
|
// getType - Return the node type of this object...
|
|
const Type *getType() const { return Ty; }
|
|
bool isArray() const { return NodeType & Array; }
|
|
|
|
/// hasNoReferrers - Return true if nothing is pointing to this node at all.
|
|
///
|
|
bool hasNoReferrers() const { return getNumReferrers() == 0; }
|
|
|
|
/// getNumReferrers - This method returns the number of referrers to the
|
|
/// current node. Note that if this node is a forwarding node, this will
|
|
/// return the number of nodes forwarding over the node!
|
|
unsigned getNumReferrers() const { return NumReferrers; }
|
|
|
|
DSGraph *getParentGraph() const { return ParentGraph; }
|
|
void setParentGraph(DSGraph *G) { ParentGraph = G; }
|
|
|
|
|
|
/// getTargetData - Get the target data object used to construct this node.
|
|
///
|
|
const TargetData &getTargetData() const;
|
|
|
|
/// getForwardNode - This method returns the node that this node is forwarded
|
|
/// to, if any.
|
|
DSNode *getForwardNode() const { return ForwardNH.getNode(); }
|
|
void stopForwarding() {
|
|
assert(!ForwardNH.isNull() &&
|
|
"Node isn't forwarding, cannot stopForwarding!");
|
|
ForwardNH.setNode(0);
|
|
}
|
|
|
|
/// hasLink - Return true if this memory object has a link in slot #LinkNo
|
|
///
|
|
bool hasLink(unsigned Offset) const {
|
|
assert((Offset & ((1 << DS::PointerShift)-1)) == 0 &&
|
|
"Pointer offset not aligned correctly!");
|
|
unsigned Index = Offset >> DS::PointerShift;
|
|
assert(Index < Links.size() && "Link index is out of range!");
|
|
return Links[Index].getNode();
|
|
}
|
|
|
|
/// getLink - Return the link at the specified offset.
|
|
DSNodeHandle &getLink(unsigned Offset) {
|
|
assert((Offset & ((1 << DS::PointerShift)-1)) == 0 &&
|
|
"Pointer offset not aligned correctly!");
|
|
unsigned Index = Offset >> DS::PointerShift;
|
|
assert(Index < Links.size() && "Link index is out of range!");
|
|
return Links[Index];
|
|
}
|
|
const DSNodeHandle &getLink(unsigned Offset) const {
|
|
assert((Offset & ((1 << DS::PointerShift)-1)) == 0 &&
|
|
"Pointer offset not aligned correctly!");
|
|
unsigned Index = Offset >> DS::PointerShift;
|
|
assert(Index < Links.size() && "Link index is out of range!");
|
|
return Links[Index];
|
|
}
|
|
|
|
/// getNumLinks - Return the number of links in a node...
|
|
///
|
|
unsigned getNumLinks() const { return Links.size(); }
|
|
|
|
/// mergeTypeInfo - This method merges the specified type into the current
|
|
/// node at the specified offset. This may update the current node's type
|
|
/// record if this gives more information to the node, it may do nothing to
|
|
/// the node if this information is already known, or it may merge the node
|
|
/// completely (and return true) if the information is incompatible with what
|
|
/// is already known.
|
|
///
|
|
/// This method returns true if the node is completely folded, otherwise
|
|
/// false.
|
|
///
|
|
bool mergeTypeInfo(const Type *Ty, unsigned Offset,
|
|
bool FoldIfIncompatible = true);
|
|
|
|
/// foldNodeCompletely - If we determine that this node has some funny
|
|
/// behavior happening to it that we cannot represent, we fold it down to a
|
|
/// single, completely pessimistic, node. This node is represented as a
|
|
/// single byte with a single TypeEntry of "void" with isArray = true.
|
|
///
|
|
void foldNodeCompletely();
|
|
|
|
/// isNodeCompletelyFolded - Return true if this node has been completely
|
|
/// folded down to something that can never be expanded, effectively losing
|
|
/// all of the field sensitivity that may be present in the node.
|
|
///
|
|
bool isNodeCompletelyFolded() const;
|
|
|
|
/// setLink - Set the link at the specified offset to the specified
|
|
/// NodeHandle, replacing what was there. It is uncommon to use this method,
|
|
/// instead one of the higher level methods should be used, below.
|
|
///
|
|
void setLink(unsigned Offset, const DSNodeHandle &NH) {
|
|
assert((Offset & ((1 << DS::PointerShift)-1)) == 0 &&
|
|
"Pointer offset not aligned correctly!");
|
|
unsigned Index = Offset >> DS::PointerShift;
|
|
assert(Index < Links.size() && "Link index is out of range!");
|
|
Links[Index] = NH;
|
|
}
|
|
|
|
/// getPointerSize - Return the size of a pointer for the current target.
|
|
///
|
|
unsigned getPointerSize() const { return DS::PointerSize; }
|
|
|
|
/// addEdgeTo - Add an edge from the current node to the specified node. This
|
|
/// can cause merging of nodes in the graph.
|
|
///
|
|
void addEdgeTo(unsigned Offset, const DSNodeHandle &NH);
|
|
|
|
/// mergeWith - Merge this node and the specified node, moving all links to
|
|
/// and from the argument node into the current node, deleting the node
|
|
/// argument. Offset indicates what offset the specified node is to be merged
|
|
/// into the current node.
|
|
///
|
|
/// The specified node may be a null pointer (in which case, nothing happens).
|
|
///
|
|
void mergeWith(const DSNodeHandle &NH, unsigned Offset);
|
|
|
|
/// addGlobal - Add an entry for a global value to the Globals list. This
|
|
/// also marks the node with the 'G' flag if it does not already have it.
|
|
///
|
|
void addGlobal(GlobalValue *GV);
|
|
void mergeGlobals(const std::vector<GlobalValue*> &RHS);
|
|
const std::vector<GlobalValue*> &getGlobals() const { return Globals; }
|
|
|
|
typedef std::vector<GlobalValue*>::const_iterator global_iterator;
|
|
global_iterator global_begin() const { return Globals.begin(); }
|
|
global_iterator global_end() const { return Globals.end(); }
|
|
|
|
|
|
/// maskNodeTypes - Apply a mask to the node types bitfield.
|
|
///
|
|
void maskNodeTypes(unsigned Mask) {
|
|
NodeType &= Mask;
|
|
}
|
|
|
|
void mergeNodeFlags(unsigned RHS) {
|
|
NodeType |= RHS;
|
|
}
|
|
|
|
/// getNodeFlags - Return all of the flags set on the node. If the DEAD flag
|
|
/// is set, hide it from the caller.
|
|
unsigned getNodeFlags() const { return NodeType & ~DEAD; }
|
|
|
|
bool isAllocaNode() const { return NodeType & AllocaNode; }
|
|
bool isHeapNode() const { return NodeType & HeapNode; }
|
|
bool isGlobalNode() const { return NodeType & GlobalNode; }
|
|
bool isUnknownNode() const { return NodeType & UnknownNode; }
|
|
|
|
bool isModified() const { return NodeType & Modified; }
|
|
bool isRead() const { return NodeType & Read; }
|
|
|
|
bool isIncomplete() const { return NodeType & Incomplete; }
|
|
bool isComplete() const { return !isIncomplete(); }
|
|
bool isDeadNode() const { return NodeType & DEAD; }
|
|
|
|
DSNode *setAllocaNodeMarker() { NodeType |= AllocaNode; return this; }
|
|
DSNode *setHeapNodeMarker() { NodeType |= HeapNode; return this; }
|
|
DSNode *setGlobalNodeMarker() { NodeType |= GlobalNode; return this; }
|
|
DSNode *setUnknownNodeMarker() { NodeType |= UnknownNode; return this; }
|
|
|
|
DSNode *setIncompleteMarker() { NodeType |= Incomplete; return this; }
|
|
DSNode *setModifiedMarker() { NodeType |= Modified; return this; }
|
|
DSNode *setReadMarker() { NodeType |= Read; return this; }
|
|
|
|
void makeNodeDead() {
|
|
Globals.clear();
|
|
assert(hasNoReferrers() && "Dead node shouldn't have refs!");
|
|
NodeType = DEAD;
|
|
}
|
|
|
|
/// forwardNode - Mark this node as being obsolete, and all references to it
|
|
/// should be forwarded to the specified node and offset.
|
|
///
|
|
void forwardNode(DSNode *To, unsigned Offset);
|
|
|
|
void print(std::ostream &O, const DSGraph *G) const;
|
|
void dump() const;
|
|
|
|
void assertOK() const;
|
|
|
|
void dropAllReferences() {
|
|
Links.clear();
|
|
if (!ForwardNH.isNull())
|
|
ForwardNH.setNode(0);
|
|
}
|
|
|
|
/// remapLinks - Change all of the Links in the current node according to the
|
|
/// specified mapping.
|
|
void remapLinks(hash_map<const DSNode*, DSNodeHandle> &OldNodeMap);
|
|
|
|
/// markReachableNodes - This method recursively traverses the specified
|
|
/// DSNodes, marking any nodes which are reachable. All reachable nodes it
|
|
/// adds to the set, which allows it to only traverse visited nodes once.
|
|
///
|
|
void markReachableNodes(hash_set<DSNode*> &ReachableNodes);
|
|
|
|
private:
|
|
friend class DSNodeHandle;
|
|
|
|
// static mergeNodes - Helper for mergeWith()
|
|
static void MergeNodes(DSNodeHandle& CurNodeH, DSNodeHandle& NH);
|
|
};
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Define inline DSNodeHandle functions that depend on the definition of DSNode
|
|
//
|
|
inline DSNode *DSNodeHandle::getNode() const {
|
|
assert((!N || Offset < N->Size || (N->Size == 0 && Offset == 0) ||
|
|
!N->ForwardNH.isNull()) && "Node handle offset out of range!");
|
|
if (N == 0 || N->ForwardNH.isNull())
|
|
return N;
|
|
|
|
return HandleForwarding();
|
|
}
|
|
|
|
inline void DSNodeHandle::setNode(DSNode *n) const {
|
|
assert(!n || !n->getForwardNode() && "Cannot set node to a forwarded node!");
|
|
if (N) N->NumReferrers--;
|
|
N = n;
|
|
if (N) {
|
|
N->NumReferrers++;
|
|
if (Offset >= N->Size) {
|
|
assert((Offset == 0 || N->Size == 1) &&
|
|
"Pointer to non-collapsed node with invalid offset!");
|
|
Offset = 0;
|
|
}
|
|
}
|
|
assert(!N || ((N->NodeType & DSNode::DEAD) == 0));
|
|
assert((!N || Offset < N->Size || (N->Size == 0 && Offset == 0) ||
|
|
!N->ForwardNH.isNull()) && "Node handle offset out of range!");
|
|
}
|
|
|
|
inline bool DSNodeHandle::hasLink(unsigned Num) const {
|
|
assert(N && "DSNodeHandle does not point to a node yet!");
|
|
return getNode()->hasLink(Num+Offset);
|
|
}
|
|
|
|
|
|
/// getLink - Treat this current node pointer as a pointer to a structure of
|
|
/// some sort. This method will return the pointer a mem[this+Num]
|
|
///
|
|
inline const DSNodeHandle &DSNodeHandle::getLink(unsigned Off) const {
|
|
assert(N && "DSNodeHandle does not point to a node yet!");
|
|
return getNode()->getLink(Offset+Off);
|
|
}
|
|
inline DSNodeHandle &DSNodeHandle::getLink(unsigned Off) {
|
|
assert(N && "DSNodeHandle does not point to a node yet!");
|
|
return getNode()->getLink(Off+Offset);
|
|
}
|
|
|
|
inline void DSNodeHandle::setLink(unsigned Off, const DSNodeHandle &NH) {
|
|
assert(N && "DSNodeHandle does not point to a node yet!");
|
|
getNode()->setLink(Off+Offset, NH);
|
|
}
|
|
|
|
/// addEdgeTo - Add an edge from the current node to the specified node. This
|
|
/// can cause merging of nodes in the graph.
|
|
///
|
|
inline void DSNodeHandle::addEdgeTo(unsigned Off, const DSNodeHandle &Node) {
|
|
assert(N && "DSNodeHandle does not point to a node yet!");
|
|
getNode()->addEdgeTo(Off+Offset, Node);
|
|
}
|
|
|
|
/// mergeWith - Merge the logical node pointed to by 'this' with the node
|
|
/// pointed to by 'N'.
|
|
///
|
|
inline void DSNodeHandle::mergeWith(const DSNodeHandle &Node) const {
|
|
if (!isNull())
|
|
getNode()->mergeWith(Node, Offset);
|
|
else { // No node to merge with, so just point to Node
|
|
Offset = 0;
|
|
setNode(Node.getNode());
|
|
Offset = Node.getOffset();
|
|
}
|
|
}
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|