mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2964 91177308-0d34-0410-b5e6-96231b3b80d8
315 lines
11 KiB
C++
315 lines
11 KiB
C++
//===- ComputeLocal.cpp - Compute a local data structure graph for a fn ---===//
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//
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// Compute the local version of the data structure graph for a function. The
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// external interface to this file is the DSGraph constructor.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/DataStructure.h"
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#include "llvm/Function.h"
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#include "llvm/iMemory.h"
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#include "llvm/iTerminators.h"
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#include "llvm/iPHINode.h"
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#include "llvm/iOther.h"
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#include "llvm/Constants.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Support/InstVisitor.h"
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using std::map;
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using std::vector;
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//===----------------------------------------------------------------------===//
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// GraphBuilder Class
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//===----------------------------------------------------------------------===//
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//
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// This class is the builder class that constructs the local data structure
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// graph by performing a single pass over the function in question.
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//
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namespace {
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class GraphBuilder : InstVisitor<GraphBuilder> {
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DSGraph &G;
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vector<DSNode*> &Nodes;
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DSNodeHandle &RetNode; // Node that gets returned...
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map<Value*, DSNodeHandle> &ValueMap;
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vector<vector<DSNodeHandle> > &FunctionCalls;
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public:
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GraphBuilder(DSGraph &g, vector<DSNode*> &nodes, DSNodeHandle &retNode,
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map<Value*, DSNodeHandle> &vm,
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vector<vector<DSNodeHandle> > &fc)
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: G(g), Nodes(nodes), RetNode(retNode), ValueMap(vm), FunctionCalls(fc) {
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// Create scalar nodes for all pointer arguments...
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for (Function::aiterator I = G.getFunction().abegin(),
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E = G.getFunction().aend(); I != E; ++I)
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if (isa<PointerType>(I->getType()))
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getValueNode(*I);
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visit(G.getFunction()); // Single pass over the function
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G.removeDeadNodes();
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}
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private:
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// Visitor functions, used to handle each instruction type we encounter...
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friend class InstVisitor<GraphBuilder>;
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void visitMallocInst(MallocInst &MI) { handleAlloc(MI, DSNode::NewNode); }
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void visitAllocaInst(AllocaInst &AI) { handleAlloc(AI, DSNode::AllocaNode);}
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void handleAlloc(AllocationInst &AI, DSNode::NodeTy NT);
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void visitPHINode(PHINode &PN);
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void visitGetElementPtrInst(GetElementPtrInst &GEP);
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void visitReturnInst(ReturnInst &RI);
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void visitLoadInst(LoadInst &LI);
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void visitStoreInst(StoreInst &SI);
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void visitCallInst(CallInst &CI);
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void visitSetCondInst(SetCondInst &SCI) {} // SetEQ & friends are ignored
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void visitFreeInst(FreeInst &FI) {} // Ignore free instructions
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void visitInstruction(Instruction &I); // Visit unsafe ptr instruction
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private:
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// Helper functions used to implement the visitation functions...
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// createNode - Create a new DSNode, ensuring that it is properly added to
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// the graph.
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//
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DSNode *createNode(DSNode::NodeTy NodeType, const Type *Ty);
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// getValueNode - Return a DSNode that corresponds the the specified LLVM
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// value. This either returns the already existing node, or creates a new
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// one and adds it to the graph, if none exists.
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//
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DSNode *getValueNode(Value &V);
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// getGlobalNode - Just like getValueNode, except the global node itself is
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// returned, not a scalar node pointing to a global.
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//
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DSNode *getGlobalNode(GlobalValue &V);
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// getLink - This method is used to either return the specified link in the
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// specified node if one exists. If a link does not already exist (it's
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// null), then we create a new node, link it, then return it.
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//
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DSNode *getLink(DSNode *Node, unsigned Link);
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// getSubscriptedNode - Perform the basic getelementptr functionality that
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// must be factored out of gep, load and store while they are all MAI's.
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//
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DSNode *getSubscriptedNode(MemAccessInst &MAI, DSNode *Ptr);
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};
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}
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//===----------------------------------------------------------------------===//
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// DSGraph constructor - Simply use the GraphBuilder to construct the local
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// graph.
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DSGraph::DSGraph(Function &F) : Func(F), RetNode(0) {
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// Use the graph builder to construct the local version of the graph
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GraphBuilder B(*this, Nodes, RetNode, ValueMap, FunctionCalls);
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markIncompleteNodes();
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}
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//===----------------------------------------------------------------------===//
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// Helper method implementations...
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//
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// createNode - Create a new DSNode, ensuring that it is properly added to the
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// graph.
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//
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DSNode *GraphBuilder::createNode(DSNode::NodeTy NodeType, const Type *Ty) {
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DSNode *N = new DSNode(NodeType, Ty);
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Nodes.push_back(N);
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return N;
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}
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// getGlobalNode - Just like getValueNode, except the global node itself is
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// returned, not a scalar node pointing to a global.
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//
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DSNode *GraphBuilder::getGlobalNode(GlobalValue &V) {
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DSNodeHandle &NH = ValueMap[&V];
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if (NH) return NH; // Already have a node? Just return it...
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// Create a new global node for this global variable...
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DSNode *G = createNode(DSNode::GlobalNode, V.getType()->getElementType());
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G->addGlobal(&V);
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// If this node has outgoing edges, make sure to recycle the same node for
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// each use. For functions and other global variables, this is unneccesary,
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// so avoid excessive merging by cloning these nodes on demand.
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//
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NH = G;
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return G;
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}
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// getValueNode - Return a DSNode that corresponds the the specified LLVM value.
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// This either returns the already existing node, or creates a new one and adds
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// it to the graph, if none exists.
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//
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DSNode *GraphBuilder::getValueNode(Value &V) {
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assert(isa<PointerType>(V.getType()) && "Should only use pointer scalars!");
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if (!isa<GlobalValue>(V)) {
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DSNodeHandle &NH = ValueMap[&V];
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if (NH) return NH; // Already have a node? Just return it...
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}
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// Otherwise we need to create a new scalar node...
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DSNode *N = createNode(DSNode::ScalarNode, V.getType());
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// If this is a global value, create the global pointed to.
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if (GlobalValue *GV = dyn_cast<GlobalValue>(&V)) {
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DSNode *G = getGlobalNode(*GV);
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N->addEdgeTo(G);
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} else {
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ValueMap[&V] = N;
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}
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return N;
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}
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// getLink - This method is used to either return the specified link in the
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// specified node if one exists. If a link does not already exist (it's
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// null), then we create a new node, link it, then return it.
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//
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DSNode *GraphBuilder::getLink(DSNode *Node, unsigned Link) {
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assert(Link < Node->getNumLinks() && "Link accessed out of range!");
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if (Node->getLink(Link) == 0) {
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DSNode::NodeTy NT;
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const Type *Ty;
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switch (Node->getType()->getPrimitiveID()) {
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case Type::PointerTyID:
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Ty = cast<PointerType>(Node->getType())->getElementType();
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NT = DSNode::ShadowNode;
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break;
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case Type::ArrayTyID:
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Ty = cast<ArrayType>(Node->getType())->getElementType();
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NT = DSNode::SubElement;
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break;
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case Type::StructTyID:
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Ty = cast<StructType>(Node->getType())->getContainedType(Link);
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NT = DSNode::SubElement;
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break;
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default:
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assert(0 && "Unexpected type to dereference!");
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abort();
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}
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DSNode *New = createNode(NT, Ty);
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Node->addEdgeTo(Link, New);
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}
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return Node->getLink(Link);
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}
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// getSubscriptedNode - Perform the basic getelementptr functionality that must
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// be factored out of gep, load and store while they are all MAI's.
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//
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DSNode *GraphBuilder::getSubscriptedNode(MemAccessInst &MAI, DSNode *Ptr) {
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for (unsigned i = MAI.getFirstIndexOperandNumber(), e = MAI.getNumOperands();
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i != e; ++i)
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if (MAI.getOperand(i)->getType() == Type::UIntTy)
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Ptr = getLink(Ptr, 0);
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else if (MAI.getOperand(i)->getType() == Type::UByteTy)
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Ptr = getLink(Ptr, cast<ConstantUInt>(MAI.getOperand(i))->getValue());
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if (MAI.getFirstIndexOperandNumber() == MAI.getNumOperands())
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Ptr = getLink(Ptr, 0); // All MAI's have an implicit 0 if nothing else.
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return Ptr;
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}
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//===----------------------------------------------------------------------===//
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// Specific instruction type handler implementations...
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//
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// Alloca & Malloc instruction implementation - Simply create a new memory
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// object, pointing the scalar to it.
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//
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void GraphBuilder::handleAlloc(AllocationInst &AI, DSNode::NodeTy NodeType) {
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DSNode *Scalar = getValueNode(AI);
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DSNode *New = createNode(NodeType, AI.getAllocatedType());
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Scalar->addEdgeTo(New); // Make the scalar point to the new node...
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}
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// PHINode - Make the scalar for the PHI node point to all of the things the
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// incoming values point to... which effectively causes them to be merged.
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//
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void GraphBuilder::visitPHINode(PHINode &PN) {
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if (!isa<PointerType>(PN.getType())) return; // Only pointer PHIs
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DSNode *Scalar = getValueNode(PN);
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DSNode *ScalarDest = getLink(Scalar, 0);
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for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
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ScalarDest->mergeWith(getLink(getValueNode(*PN.getIncomingValue(i)), 0));
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}
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void GraphBuilder::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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DSNode *Ptr = getSubscriptedNode(GEP, getValueNode(*GEP.getOperand(0)));
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getValueNode(GEP)->addEdgeTo(Ptr);
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}
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void GraphBuilder::visitLoadInst(LoadInst &LI) {
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if (!isa<PointerType>(LI.getType())) return; // Only pointer PHIs
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DSNode *Ptr = getSubscriptedNode(LI, getValueNode(*LI.getOperand(0)));
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getValueNode(LI)->addEdgeTo(getLink(Ptr, 0));
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}
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void GraphBuilder::visitStoreInst(StoreInst &SI) {
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if (!isa<PointerType>(SI.getOperand(0)->getType())) return;
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DSNode *Value = getValueNode(*SI.getOperand(0));
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DSNode *DestPtr = getValueNode(*SI.getOperand(1));
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getSubscriptedNode(SI, DestPtr)->addEdgeTo(getLink(Value, 0));
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}
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void GraphBuilder::visitReturnInst(ReturnInst &RI) {
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if (RI.getNumOperands() && isa<PointerType>(RI.getOperand(0)->getType())) {
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DSNode *Value = getLink(getValueNode(*RI.getOperand(0)), 0);
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Value->mergeWith(RetNode);
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RetNode = Value;
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}
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}
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void GraphBuilder::visitCallInst(CallInst &CI) {
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// Add a new function call entry...
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FunctionCalls.push_back(vector<DSNodeHandle>());
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vector<DSNodeHandle> &Args = FunctionCalls.back();
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// Set up the return value...
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if (isa<PointerType>(CI.getType()))
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Args.push_back(getLink(getValueNode(CI), 0));
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else
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Args.push_back(0);
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unsigned Start = 0;
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// Special case for direct call, avoid creating spurious scalar node...
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if (GlobalValue *GV = dyn_cast<GlobalValue>(CI.getOperand(0))) {
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Args.push_back(getGlobalNode(*GV));
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Start = 1;
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}
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// Pass the arguments in...
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for (unsigned i = Start, e = CI.getNumOperands(); i != e; ++i)
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if (isa<PointerType>(CI.getOperand(i)->getType()))
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Args.push_back(getLink(getValueNode(*CI.getOperand(i)), 0));
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}
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// visitInstruction - All safe instructions have been processed above, this case
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// is where unsafe ptr instructions land.
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//
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void GraphBuilder::visitInstruction(Instruction &I) {
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// If the return type is a pointer, mark the pointed node as being a cast node
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if (isa<PointerType>(I.getType()))
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getLink(getValueNode(I), 0)->NodeType |= DSNode::CastNode;
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// If any operands are pointers, mark the pointed nodes as being a cast node
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for (Instruction::op_iterator i = I.op_begin(), E = I.op_end(); i!=E; ++i)
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if (isa<PointerType>(i->get()->getType()))
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getLink(getValueNode(*i->get()), 0)->NodeType |= DSNode::CastNode;
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}
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