mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 20:29:48 +00:00
4fe346184a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4748 91177308-0d34-0410-b5e6-96231b3b80d8
440 lines
15 KiB
C++
440 lines
15 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/DataStructure.h"
|
|
#include "llvm/Analysis/DSGraph.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"
|
|
#include "Support/Timer.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");
|
|
|
|
namespace DS {
|
|
// FIXME: Do something smarter with target data!
|
|
TargetData TD("temp-td");
|
|
|
|
// 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;
|
|
}
|
|
}
|
|
using namespace DS;
|
|
|
|
|
|
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> &ScalarMap;
|
|
vector<DSCallSite> &FunctionCalls;
|
|
|
|
public:
|
|
GraphBuilder(DSGraph &g, vector<DSNode*> &nodes, DSNodeHandle &retNode,
|
|
map<Value*, DSNodeHandle> &SM,
|
|
vector<DSCallSite> &fc)
|
|
: G(g), Nodes(nodes), RetNode(retNode), ScalarMap(SM), 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
|
|
}
|
|
|
|
private:
|
|
// Visitor functions, used to handle each instruction type we encounter...
|
|
friend class InstVisitor<GraphBuilder>;
|
|
void visitMallocInst(MallocInst &MI) { handleAlloc(MI, DSNode::HeapNode); }
|
|
void visitAllocaInst(AllocaInst &AI) { handleAlloc(AI, DSNode::AllocaNode);}
|
|
void handleAlloc(AllocationInst &AI, DSNode::NodeTy NT);
|
|
|
|
void visitPHINode(PHINode &PN);
|
|
|
|
void visitGetElementPtrInst(User &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 = 0) {
|
|
DSNode *N = new DSNode(NodeType, Ty); // Create the node
|
|
Nodes.push_back(N); // Add node to nodes list
|
|
return N;
|
|
}
|
|
|
|
/// setDestTo - Set the ScalarMap entry for the specified value to point to
|
|
/// the specified destination. If the Value already points to a node, make
|
|
/// sure to merge the two destinations together.
|
|
///
|
|
void setDestTo(Value &V, const DSNodeHandle &NH);
|
|
|
|
/// getValueDest - Return the DSNode that the actual value points to.
|
|
///
|
|
DSNodeHandle getValueDest(Value &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.
|
|
///
|
|
DSNodeHandle &getLink(const DSNodeHandle &Node, unsigned Link = 0);
|
|
};
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// DSGraph constructor - Simply use the GraphBuilder to construct the local
|
|
// graph.
|
|
DSGraph::DSGraph(Function &F, DSGraph *GG) : Func(&F), GlobalsGraph(GG) {
|
|
PrintAuxCalls = false;
|
|
// Use the graph builder to construct the local version of the graph
|
|
GraphBuilder B(*this, Nodes, RetNode, ScalarMap, FunctionCalls);
|
|
#ifndef NDEBUG
|
|
Timer::addPeakMemoryMeasurement();
|
|
#endif
|
|
markIncompleteNodes();
|
|
|
|
// Remove any nodes made dead due to merging...
|
|
removeDeadNodes();
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Helper method implementations...
|
|
//
|
|
|
|
/// getValueDest - Return the DSNode that the actual value points to.
|
|
///
|
|
DSNodeHandle GraphBuilder::getValueDest(Value &Val) {
|
|
Value *V = &Val;
|
|
if (V == Constant::getNullValue(V->getType()))
|
|
return 0; // Null doesn't point to anything, don't add to ScalarMap!
|
|
|
|
if (Constant *C = dyn_cast<Constant>(V))
|
|
if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) {
|
|
return getValueDest(*CPR->getValue());
|
|
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
|
|
if (CE->getOpcode() == Instruction::Cast)
|
|
return getValueDest(*CE->getOperand(0));
|
|
if (CE->getOpcode() == Instruction::GetElementPtr) {
|
|
visitGetElementPtrInst(*CE);
|
|
std::map<Value*, DSNodeHandle>::iterator I = ScalarMap.find(CE);
|
|
assert(I != ScalarMap.end() && "GEP didn't get processed right?");
|
|
DSNodeHandle NH = I->second;
|
|
ScalarMap.erase(I); // Remove constant from scalarmap
|
|
return NH;
|
|
}
|
|
|
|
// This returns a conservative unknown node for any unhandled ConstExpr
|
|
return createNode(DSNode::UnknownNode);
|
|
} else if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(C)) {
|
|
// Random constants are unknown mem
|
|
return createNode(DSNode::UnknownNode);
|
|
} else {
|
|
assert(0 && "Unknown constant type!");
|
|
}
|
|
|
|
DSNodeHandle &NH = ScalarMap[V];
|
|
if (NH.getNode())
|
|
return NH; // Already have a node? Just return it...
|
|
|
|
// Otherwise we need to create a new node to point to...
|
|
DSNode *N;
|
|
if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
|
|
// Create a new global node for this global variable...
|
|
N = createNode(DSNode::GlobalNode, GV->getType()->getElementType());
|
|
N->addGlobal(GV);
|
|
} else {
|
|
// Otherwise just create a shadow node
|
|
N = createNode(DSNode::ShadowNode);
|
|
}
|
|
|
|
NH.setNode(N); // Remember that we are pointing to it...
|
|
NH.setOffset(0);
|
|
return NH;
|
|
}
|
|
|
|
|
|
/// 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) {
|
|
DSNodeHandle &Node = const_cast<DSNodeHandle&>(node);
|
|
DSNodeHandle &Link = Node.getLink(LinkNo);
|
|
if (!Link.getNode()) {
|
|
// If the link hasn't been created yet, make and return a new shadow node
|
|
Link = createNode(DSNode::ShadowNode);
|
|
}
|
|
return Link;
|
|
}
|
|
|
|
|
|
/// setDestTo - Set the ScalarMap entry for the specified value to point to the
|
|
/// specified destination. If the Value already points to a node, make sure to
|
|
/// merge the two destinations together.
|
|
///
|
|
void GraphBuilder::setDestTo(Value &V, const DSNodeHandle &NH) {
|
|
DSNodeHandle &AINH = ScalarMap[&V];
|
|
if (AINH.getNode() == 0) // Not pointing to anything yet?
|
|
AINH = NH; // Just point directly to NH
|
|
else
|
|
AINH.mergeWith(NH);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// 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) {
|
|
setDestTo(AI, createNode(NodeType));
|
|
}
|
|
|
|
// 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 &PNDest = ScalarMap[&PN];
|
|
for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
|
|
PNDest.mergeWith(getValueDest(*PN.getIncomingValue(i)));
|
|
}
|
|
|
|
void GraphBuilder::visitGetElementPtrInst(User &GEP) {
|
|
DSNodeHandle Value = getValueDest(*GEP.getOperand(0));
|
|
if (Value.getNode() == 0) return;
|
|
|
|
unsigned Offset = 0;
|
|
const PointerType *PTy = cast<PointerType>(GEP.getOperand(0)->getType());
|
|
const Type *CurTy = PTy->getElementType();
|
|
|
|
if (Value.getNode()->mergeTypeInfo(CurTy, Value.getOffset())) {
|
|
// If the node had to be folded... exit quickly
|
|
setDestTo(GEP, Value); // GEP result points to folded node
|
|
return;
|
|
}
|
|
|
|
#if 0
|
|
// Handle the pointer index specially...
|
|
if (GEP.getNumOperands() > 1 &&
|
|
GEP.getOperand(1) != ConstantSInt::getNullValue(Type::LongTy)) {
|
|
|
|
// If we already know this is an array being accessed, don't do anything...
|
|
if (!TopTypeRec.isArray) {
|
|
TopTypeRec.isArray = true;
|
|
|
|
// If we are treating some inner field pointer as an array, fold the node
|
|
// up because we cannot handle it right. This can come because of
|
|
// something like this: &((&Pt->X)[1]) == &Pt->Y
|
|
//
|
|
if (Value.getOffset()) {
|
|
// Value is now the pointer we want to GEP to be...
|
|
Value.getNode()->foldNodeCompletely();
|
|
setDestTo(GEP, Value); // GEP result points to folded node
|
|
return;
|
|
} else {
|
|
// This is a pointer to the first byte of the node. Make sure that we
|
|
// are pointing to the outter most type in the node.
|
|
// FIXME: We need to check one more case here...
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// All of these subscripts are indexing INTO the elements we have...
|
|
for (unsigned i = 2, 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 0
|
|
if (ConstantSInt *CS = dyn_cast<ConstantSInt>(GEP.getOperand(i))) {
|
|
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);
|
|
}
|
|
}
|
|
#endif
|
|
} 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...
|
|
setDestTo(GEP, Value);
|
|
}
|
|
|
|
void GraphBuilder::visitLoadInst(LoadInst &LI) {
|
|
DSNodeHandle Ptr = getValueDest(*LI.getOperand(0));
|
|
if (Ptr.getNode() == 0) return;
|
|
|
|
// Make that the node is read from...
|
|
Ptr.getNode()->NodeType |= DSNode::Read;
|
|
|
|
// Ensure a typerecord exists...
|
|
Ptr.getNode()->mergeTypeInfo(LI.getType(), Ptr.getOffset());
|
|
|
|
if (isPointerType(LI.getType()))
|
|
setDestTo(LI, getLink(Ptr));
|
|
}
|
|
|
|
void GraphBuilder::visitStoreInst(StoreInst &SI) {
|
|
const Type *StoredTy = SI.getOperand(0)->getType();
|
|
DSNodeHandle Dest = getValueDest(*SI.getOperand(1));
|
|
if (Dest.getNode() == 0) return;
|
|
|
|
// Make that the node is written to...
|
|
Dest.getNode()->NodeType |= DSNode::Modified;
|
|
|
|
// Ensure a typerecord exists...
|
|
Dest.getNode()->mergeTypeInfo(StoredTy, Dest.getOffset());
|
|
|
|
// Avoid adding edges from null, or processing non-"pointer" stores
|
|
if (isPointerType(StoredTy))
|
|
Dest.addEdgeTo(getValueDest(*SI.getOperand(0)));
|
|
}
|
|
|
|
void GraphBuilder::visitReturnInst(ReturnInst &RI) {
|
|
if (RI.getNumOperands() && isPointerType(RI.getOperand(0)->getType()))
|
|
RetNode.mergeWith(getValueDest(*RI.getOperand(0)));
|
|
}
|
|
|
|
void GraphBuilder::visitCallInst(CallInst &CI) {
|
|
// Set up the return value...
|
|
DSNodeHandle RetVal;
|
|
if (isPointerType(CI.getType()))
|
|
RetVal = getValueDest(CI);
|
|
|
|
DSNodeHandle Callee = getValueDest(*CI.getOperand(0));
|
|
|
|
std::vector<DSNodeHandle> Args;
|
|
Args.reserve(CI.getNumOperands()-1);
|
|
|
|
// Calculate the arguments vector...
|
|
for (unsigned i = 1, e = CI.getNumOperands(); i != e; ++i)
|
|
if (isPointerType(CI.getOperand(i)->getType()))
|
|
Args.push_back(getValueDest(*CI.getOperand(i)));
|
|
|
|
// Add a new function call entry...
|
|
FunctionCalls.push_back(DSCallSite(CI, RetVal, Callee, Args));
|
|
}
|
|
|
|
/// Handle casts...
|
|
void GraphBuilder::visitCastInst(CastInst &CI) {
|
|
if (isPointerType(CI.getType()))
|
|
if (isPointerType(CI.getOperand(0)->getType())) {
|
|
// Cast one pointer to the other, just act like a copy instruction
|
|
setDestTo(CI, getValueDest(*CI.getOperand(0)));
|
|
} else {
|
|
// Cast something (floating point, small integer) to a pointer. We need
|
|
// to track the fact that the node points to SOMETHING, just something we
|
|
// don't know about. Make an "Unknown" node.
|
|
//
|
|
setDestTo(CI, createNode(DSNode::UnknownNode));
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// LocalDataStructures Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
bool LocalDataStructures::run(Module &M) {
|
|
GlobalsGraph = new DSGraph();
|
|
|
|
// 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, GlobalsGraph)));
|
|
return false;
|
|
}
|
|
|
|
// 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();
|
|
delete GlobalsGraph;
|
|
GlobalsGraph = 0;
|
|
}
|