mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-28 22:55:52 +00:00
c5f21de2bc
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4029 91177308-0d34-0410-b5e6-96231b3b80d8
414 lines
14 KiB
C++
414 lines
14 KiB
C++
//===- Local.cpp - Compute a local data structure graph for a function ----===//
|
|
//
|
|
// Compute the local version of the data structure graph for a function. The
|
|
// external interface to this file is the DSGraph constructor.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/DSGraph.h"
|
|
#include "llvm/Analysis/DataStructure.h"
|
|
#include "llvm/iMemory.h"
|
|
#include "llvm/iTerminators.h"
|
|
#include "llvm/iPHINode.h"
|
|
#include "llvm/iOther.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/GlobalVariable.h"
|
|
#include "llvm/Support/InstVisitor.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "Support/Statistic.h"
|
|
|
|
// FIXME: This should eventually be a FunctionPass that is automatically
|
|
// aggregated into a Pass.
|
|
//
|
|
#include "llvm/Module.h"
|
|
|
|
using std::map;
|
|
using std::vector;
|
|
|
|
static RegisterAnalysis<LocalDataStructures>
|
|
X("datastructure", "Local Data Structure Analysis");
|
|
|
|
using namespace DataStructureAnalysis;
|
|
|
|
namespace DataStructureAnalysis {
|
|
// FIXME: Do something smarter with target data!
|
|
TargetData TD("temp-td");
|
|
unsigned PointerSize(TD.getPointerSize());
|
|
|
|
// isPointerType - Return true if this type is big enough to hold a pointer.
|
|
bool isPointerType(const Type *Ty) {
|
|
if (isa<PointerType>(Ty))
|
|
return true;
|
|
else if (Ty->isPrimitiveType() && Ty->isInteger())
|
|
return Ty->getPrimitiveSize() >= PointerSize;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
namespace {
|
|
//===--------------------------------------------------------------------===//
|
|
// GraphBuilder Class
|
|
//===--------------------------------------------------------------------===//
|
|
//
|
|
/// This class is the builder class that constructs the local data structure
|
|
/// graph by performing a single pass over the function in question.
|
|
///
|
|
class GraphBuilder : InstVisitor<GraphBuilder> {
|
|
DSGraph &G;
|
|
vector<DSNode*> &Nodes;
|
|
DSNodeHandle &RetNode; // Node that gets returned...
|
|
map<Value*, DSNodeHandle> &ValueMap;
|
|
vector<vector<DSNodeHandle> > &FunctionCalls;
|
|
|
|
public:
|
|
GraphBuilder(DSGraph &g, vector<DSNode*> &nodes, DSNodeHandle &retNode,
|
|
map<Value*, DSNodeHandle> &vm,
|
|
vector<vector<DSNodeHandle> > &fc)
|
|
: G(g), Nodes(nodes), RetNode(retNode), ValueMap(vm), FunctionCalls(fc) {
|
|
|
|
// Create scalar nodes for all pointer arguments...
|
|
for (Function::aiterator I = G.getFunction().abegin(),
|
|
E = G.getFunction().aend(); I != E; ++I)
|
|
if (isPointerType(I->getType()))
|
|
getValueDest(*I);
|
|
|
|
visit(G.getFunction()); // Single pass over the function
|
|
|
|
// Not inlining, only eliminate trivially dead nodes.
|
|
G.removeTriviallyDeadNodes();
|
|
}
|
|
|
|
private:
|
|
// Visitor functions, used to handle each instruction type we encounter...
|
|
friend class InstVisitor<GraphBuilder>;
|
|
void visitMallocInst(MallocInst &MI) { handleAlloc(MI, DSNode::NewNode); }
|
|
void visitAllocaInst(AllocaInst &AI) { handleAlloc(AI, DSNode::AllocaNode);}
|
|
void handleAlloc(AllocationInst &AI, DSNode::NodeTy NT);
|
|
|
|
void visitPHINode(PHINode &PN);
|
|
|
|
void visitGetElementPtrInst(GetElementPtrInst &GEP);
|
|
void visitReturnInst(ReturnInst &RI);
|
|
void visitLoadInst(LoadInst &LI);
|
|
void visitStoreInst(StoreInst &SI);
|
|
void visitCallInst(CallInst &CI);
|
|
void visitSetCondInst(SetCondInst &SCI) {} // SetEQ & friends are ignored
|
|
void visitFreeInst(FreeInst &FI) {} // Ignore free instructions
|
|
void visitCastInst(CastInst &CI);
|
|
void visitInstruction(Instruction &I) {}
|
|
|
|
private:
|
|
// Helper functions used to implement the visitation functions...
|
|
|
|
/// createNode - Create a new DSNode, ensuring that it is properly added to
|
|
/// the graph.
|
|
///
|
|
DSNode *createNode(DSNode::NodeTy NodeType, const Type *Ty);
|
|
|
|
/// getValueNode - Return a DSNode that corresponds the the specified LLVM
|
|
/// value. This either returns the already existing node, or creates a new
|
|
/// one and adds it to the graph, if none exists.
|
|
///
|
|
DSNodeHandle getValueNode(Value &V);
|
|
|
|
/// getValueDest - Return the DSNode that the actual value points to. This
|
|
/// is basically the same thing as: getLink(getValueNode(V), 0)
|
|
///
|
|
DSNodeHandle &getValueDest(Value &V);
|
|
|
|
/// getGlobalNode - Just like getValueNode, except the global node itself is
|
|
/// returned, not a scalar node pointing to a global.
|
|
///
|
|
DSNodeHandle &getGlobalNode(GlobalValue &V);
|
|
|
|
/// getLink - This method is used to return the specified link in the
|
|
/// specified node if one exists. If a link does not already exist (it's
|
|
/// null), then we create a new node, link it, then return it. We must
|
|
/// specify the type of the Node field we are accessing so that we know what
|
|
/// type should be linked to if we need to create a new node.
|
|
///
|
|
DSNodeHandle &getLink(const DSNodeHandle &Node, unsigned Link,
|
|
const Type *FieldTy);
|
|
};
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DSGraph constructor - Simply use the GraphBuilder to construct the local
|
|
// graph.
|
|
DSGraph::DSGraph(Function &F) : Func(&F) {
|
|
// Use the graph builder to construct the local version of the graph
|
|
GraphBuilder B(*this, Nodes, RetNode, ValueMap, FunctionCalls);
|
|
markIncompleteNodes();
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Helper method implementations...
|
|
//
|
|
|
|
|
|
// createNode - Create a new DSNode, ensuring that it is properly added to the
|
|
// graph.
|
|
//
|
|
DSNode *GraphBuilder::createNode(DSNode::NodeTy NodeType, const Type *Ty) {
|
|
DSNode *N = new DSNode(NodeType, Ty);
|
|
Nodes.push_back(N);
|
|
return N;
|
|
}
|
|
|
|
|
|
// getGlobalNode - Just like getValueNode, except the global node itself is
|
|
// returned, not a scalar node pointing to a global.
|
|
//
|
|
DSNodeHandle &GraphBuilder::getGlobalNode(GlobalValue &V) {
|
|
DSNodeHandle &NH = ValueMap[&V];
|
|
if (NH.getNode()) return NH; // Already have a node? Just return it...
|
|
|
|
// Create a new global node for this global variable...
|
|
DSNode *G = createNode(DSNode::GlobalNode, V.getType()->getElementType());
|
|
G->addGlobal(&V);
|
|
|
|
// If this node has outgoing edges, make sure to recycle the same node for
|
|
// each use. For functions and other global variables, this is unneccesary,
|
|
// so avoid excessive merging by cloning these nodes on demand.
|
|
//
|
|
NH.setNode(G);
|
|
return NH;
|
|
}
|
|
|
|
|
|
// getValueNode - Return a DSNode that corresponds the the specified LLVM value.
|
|
// This either returns the already existing node, or creates a new one and adds
|
|
// it to the graph, if none exists.
|
|
//
|
|
DSNodeHandle GraphBuilder::getValueNode(Value &V) {
|
|
assert(isPointerType(V.getType()) && "Should only use pointer scalars!");
|
|
// Do not share the pointer value to globals... this would cause way too much
|
|
// false merging.
|
|
//
|
|
DSNodeHandle &NH = ValueMap[&V];
|
|
if (!isa<GlobalValue>(V) && NH.getNode())
|
|
return NH; // Already have a node? Just return it...
|
|
|
|
// Otherwise we need to create a new scalar node...
|
|
DSNode *N = createNode(DSNode::ScalarNode, V.getType());
|
|
|
|
// If this is a global value, create the global pointed to.
|
|
if (GlobalValue *GV = dyn_cast<GlobalValue>(&V)) {
|
|
N->addEdgeTo(0, getGlobalNode(*GV));
|
|
return DSNodeHandle(N, 0);
|
|
} else {
|
|
NH.setOffset(0);
|
|
NH.setNode(N);
|
|
}
|
|
|
|
return NH;
|
|
}
|
|
|
|
/// getValueDest - Return the DSNode that the actual value points to. This
|
|
/// is basically the same thing as: getLink(getValueNode(V), 0)
|
|
///
|
|
DSNodeHandle &GraphBuilder::getValueDest(Value &V) {
|
|
return getLink(getValueNode(V), 0, V.getType());
|
|
}
|
|
|
|
|
|
|
|
/// getLink - This method is used to return the specified link in the
|
|
/// specified node if one exists. If a link does not already exist (it's
|
|
/// null), then we create a new node, link it, then return it. We must
|
|
/// specify the type of the Node field we are accessing so that we know what
|
|
/// type should be linked to if we need to create a new node.
|
|
///
|
|
DSNodeHandle &GraphBuilder::getLink(const DSNodeHandle &node,
|
|
unsigned LinkNo, const Type *FieldTy) {
|
|
DSNodeHandle &Node = const_cast<DSNodeHandle&>(node);
|
|
|
|
DSNodeHandle *Link = Node.getLink(LinkNo);
|
|
if (Link) return *Link;
|
|
|
|
// If the link hasn't been created yet, make and return a new shadow node of
|
|
// the appropriate type for FieldTy...
|
|
//
|
|
|
|
// If we are indexing with a typed pointer, then the thing we are pointing
|
|
// to is of the pointed type. If we are pointing to it with an integer
|
|
// (because of cast to an integer), we represent it with a void type.
|
|
//
|
|
const Type *ReqTy;
|
|
if (const PointerType *Ptr = dyn_cast<PointerType>(FieldTy))
|
|
ReqTy = Ptr->getElementType();
|
|
else
|
|
ReqTy = Type::VoidTy;
|
|
|
|
DSNode *N = createNode(DSNode::ShadowNode, ReqTy);
|
|
Node.setLink(LinkNo, N);
|
|
return *Node.getLink(LinkNo);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Specific instruction type handler implementations...
|
|
//
|
|
|
|
/// Alloca & Malloc instruction implementation - Simply create a new memory
|
|
/// object, pointing the scalar to it.
|
|
///
|
|
void GraphBuilder::handleAlloc(AllocationInst &AI, DSNode::NodeTy NodeType) {
|
|
DSNode *New = createNode(NodeType, AI.getAllocatedType());
|
|
|
|
// Make the scalar point to the new node...
|
|
getValueNode(AI).addEdgeTo(New);
|
|
}
|
|
|
|
// PHINode - Make the scalar for the PHI node point to all of the things the
|
|
// incoming values point to... which effectively causes them to be merged.
|
|
//
|
|
void GraphBuilder::visitPHINode(PHINode &PN) {
|
|
if (!isPointerType(PN.getType())) return; // Only pointer PHIs
|
|
|
|
DSNodeHandle &ScalarDest = getValueDest(PN);
|
|
for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
|
|
if (!isa<ConstantPointerNull>(PN.getIncomingValue(i)))
|
|
ScalarDest.mergeWith(getValueDest(*PN.getIncomingValue(i)));
|
|
}
|
|
|
|
void GraphBuilder::visitGetElementPtrInst(GetElementPtrInst &GEP) {
|
|
DSNodeHandle Value = getValueDest(*GEP.getOperand(0));
|
|
|
|
unsigned Offset = 0;
|
|
const Type *CurTy = GEP.getOperand(0)->getType();
|
|
|
|
for (unsigned i = 1, e = GEP.getNumOperands(); i != e; ++i)
|
|
if (GEP.getOperand(i)->getType() == Type::LongTy) {
|
|
// Get the type indexing into...
|
|
const SequentialType *STy = cast<SequentialType>(CurTy);
|
|
CurTy = STy->getElementType();
|
|
if (ConstantSInt *CS = dyn_cast<ConstantSInt>(GEP.getOperand(i))) {
|
|
if (isa<PointerType>(STy))
|
|
std::cerr << "Pointer indexing not handled yet!\n";
|
|
else
|
|
Offset += CS->getValue()*TD.getTypeSize(CurTy);
|
|
} else {
|
|
// Variable index into a node. We must merge all of the elements of the
|
|
// sequential type here.
|
|
if (isa<PointerType>(STy))
|
|
std::cerr << "Pointer indexing not handled yet!\n";
|
|
else {
|
|
const ArrayType *ATy = cast<ArrayType>(STy);
|
|
unsigned ElSize = TD.getTypeSize(CurTy);
|
|
DSNode *N = Value.getNode();
|
|
assert(N && "Value must have a node!");
|
|
unsigned RawOffset = Offset+Value.getOffset();
|
|
|
|
// Loop over all of the elements of the array, merging them into the
|
|
// zero'th element.
|
|
for (unsigned i = 1, e = ATy->getNumElements(); i != e; ++i)
|
|
// Merge all of the byte components of this array element
|
|
for (unsigned j = 0; j != ElSize; ++j)
|
|
N->mergeIndexes(RawOffset+j, RawOffset+i*ElSize+j);
|
|
}
|
|
}
|
|
} else if (GEP.getOperand(i)->getType() == Type::UByteTy) {
|
|
unsigned FieldNo = cast<ConstantUInt>(GEP.getOperand(i))->getValue();
|
|
const StructType *STy = cast<StructType>(CurTy);
|
|
Offset += TD.getStructLayout(STy)->MemberOffsets[FieldNo];
|
|
CurTy = STy->getContainedType(FieldNo);
|
|
}
|
|
|
|
// Add in the offset calculated...
|
|
Value.setOffset(Value.getOffset()+Offset);
|
|
|
|
// Value is now the pointer we want to GEP to be...
|
|
getValueNode(GEP).addEdgeTo(Value);
|
|
}
|
|
|
|
void GraphBuilder::visitLoadInst(LoadInst &LI) {
|
|
DSNodeHandle &Ptr = getValueDest(*LI.getOperand(0));
|
|
if (isPointerType(LI.getType()))
|
|
getValueNode(LI).addEdgeTo(getLink(Ptr, 0, LI.getType()));
|
|
}
|
|
|
|
void GraphBuilder::visitStoreInst(StoreInst &SI) {
|
|
DSNodeHandle &Dest = getValueDest(*SI.getOperand(1));
|
|
|
|
// Avoid adding edges from null, or processing non-"pointer" stores
|
|
if (isPointerType(SI.getOperand(0)->getType()) &&
|
|
!isa<ConstantPointerNull>(SI.getOperand(0))) {
|
|
Dest.addEdgeTo(getValueDest(*SI.getOperand(0)));
|
|
}
|
|
}
|
|
|
|
void GraphBuilder::visitReturnInst(ReturnInst &RI) {
|
|
if (RI.getNumOperands() && isPointerType(RI.getOperand(0)->getType()) &&
|
|
!isa<ConstantPointerNull>(RI.getOperand(0))) {
|
|
DSNodeHandle &Value = getValueDest(*RI.getOperand(0));
|
|
Value.mergeWith(RetNode);
|
|
RetNode = Value;
|
|
}
|
|
}
|
|
|
|
void GraphBuilder::visitCallInst(CallInst &CI) {
|
|
// Add a new function call entry...
|
|
FunctionCalls.push_back(vector<DSNodeHandle>());
|
|
vector<DSNodeHandle> &Args = FunctionCalls.back();
|
|
|
|
// Set up the return value...
|
|
if (isPointerType(CI.getType()))
|
|
Args.push_back(getLink(getValueNode(CI), 0, CI.getType()));
|
|
else
|
|
Args.push_back(DSNodeHandle());
|
|
|
|
unsigned Start = 0;
|
|
// Special case for a direct call, avoid creating spurious scalar node...
|
|
if (GlobalValue *GV = dyn_cast<GlobalValue>(CI.getOperand(0))) {
|
|
Args.push_back(getGlobalNode(*GV));
|
|
Start = 1;
|
|
}
|
|
|
|
// Pass the arguments in...
|
|
for (unsigned i = Start, e = CI.getNumOperands(); i != e; ++i)
|
|
if (isPointerType(CI.getOperand(i)->getType()))
|
|
Args.push_back(getLink(getValueNode(*CI.getOperand(i)), 0,
|
|
CI.getOperand(i)->getType()));
|
|
}
|
|
|
|
/// Handle casts...
|
|
void GraphBuilder::visitCastInst(CastInst &CI) {
|
|
if (isPointerType(CI.getType()) && isPointerType(CI.getOperand(0)->getType()))
|
|
getValueNode(CI).addEdgeTo(getLink(getValueNode(*CI.getOperand(0)), 0,
|
|
CI.getOperand(0)->getType()));
|
|
}
|
|
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// LocalDataStructures Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// releaseMemory - If the pass pipeline is done with this pass, we can release
|
|
// our memory... here...
|
|
//
|
|
void LocalDataStructures::releaseMemory() {
|
|
for (std::map<const Function*, DSGraph*>::iterator I = DSInfo.begin(),
|
|
E = DSInfo.end(); I != E; ++I)
|
|
delete I->second;
|
|
|
|
// Empty map so next time memory is released, data structures are not
|
|
// re-deleted.
|
|
DSInfo.clear();
|
|
}
|
|
|
|
bool LocalDataStructures::run(Module &M) {
|
|
// Calculate all of the graphs...
|
|
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
|
|
if (!I->isExternal())
|
|
DSInfo.insert(std::make_pair(I, new DSGraph(*I)));
|
|
return false;
|
|
}
|
|
|