6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-19 04:29:21 +00:00
Code Issues Projects Releases Wiki Activity

Files depend on DSA, moved to lib/Analysis/DataStructure

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14326 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-06-22 18:13:24 +00:00
parent e5d6dab09e
commit bab75268f0
2 changed files with 0 additions and 947 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

447
lib/Analysis/IPA/IPModRef.cpp
View File

@ -1,447 +0,0 @@
//===- IPModRef.cpp - Compute IP Mod/Ref information ------------*- 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.
//
//===----------------------------------------------------------------------===//
//
// See high-level comments in include/llvm/Analysis/IPModRef.h
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/IPModRef.h"
#include "llvm/Analysis/DataStructure.h"
#include "llvm/Analysis/DSGraph.h"
#include "llvm/Module.h"
#include "llvm/Function.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
#include "Support/Statistic.h"
#include "Support/STLExtras.h"
#include "Support/StringExtras.h"
#include <vector>
namespace llvm {
//----------------------------------------------------------------------------
// Private constants and data
//----------------------------------------------------------------------------
static RegisterAnalysis<IPModRef>
Z("ipmodref", "Interprocedural mod/ref analysis");
//----------------------------------------------------------------------------
// class ModRefInfo
//----------------------------------------------------------------------------
void ModRefInfo::print(std::ostream &O,
const std::string& sprefix) const
{
O << sprefix << "Modified nodes = " << modNodeSet;
O << sprefix << "Referenced nodes = " << refNodeSet;
}
void ModRefInfo::dump() const
{
print(std::cerr);
}
//----------------------------------------------------------------------------
// class FunctionModRefInfo
//----------------------------------------------------------------------------
// This constructor computes a node numbering for the TD graph.
//
FunctionModRefInfo::FunctionModRefInfo(const Function& func,
IPModRef& ipmro,
DSGraph* tdgClone)
: F(func), IPModRefObj(ipmro),
funcTDGraph(tdgClone),
funcModRefInfo(tdgClone->getGraphSize())
{
unsigned i = 0;
for (DSGraph::node_iterator NI = funcTDGraph->node_begin(),
E = funcTDGraph->node_end(); NI != E; ++NI)
NodeIds[*NI] = i++;
}
FunctionModRefInfo::~FunctionModRefInfo()
{
for(std::map<const Instruction*, ModRefInfo*>::iterator
I=callSiteModRefInfo.begin(), E=callSiteModRefInfo.end(); I != E; ++I)
delete(I->second);
// Empty map just to make problems easier to track down
callSiteModRefInfo.clear();
delete funcTDGraph;
}
unsigned FunctionModRefInfo::getNodeId(const Value* value) const {
return getNodeId(funcTDGraph->getNodeForValue(const_cast<Value*>(value))
.getNode());
}
// Compute Mod/Ref bit vectors for the entire function.
// These are simply copies of the Read/Write flags from the nodes of
// the top-down DS graph.
//
void FunctionModRefInfo::computeModRef(const Function &func)
{
// Mark all nodes in the graph that are marked MOD as being mod
// and all those marked REF as being ref.
unsigned i = 0;
for (DSGraph::node_iterator NI = funcTDGraph->node_begin(),
E = funcTDGraph->node_end(); NI != E; ++NI, ++i) {
if ((*NI)->isModified()) funcModRefInfo.setNodeIsMod(i);
if ((*NI)->isRead()) funcModRefInfo.setNodeIsRef(i);
}
// Compute the Mod/Ref info for all call sites within the function.
// The call sites are recorded in the TD graph.
const std::vector<DSCallSite>& callSites = funcTDGraph->getFunctionCalls();
for (unsigned i = 0, N = callSites.size(); i < N; ++i)
computeModRef(callSites[i].getCallSite());
}
// ResolveCallSiteModRefInfo - This method performs the following actions:
//
// 1. It clones the top-down graph for the current function
// 2. It clears all of the mod/ref bits in the cloned graph
// 3. It then merges the bottom-up graph(s) for the specified call-site into
// the clone (bringing new mod/ref bits).
// 4. It returns the clone, and a mapping of nodes from the original TDGraph to
// the cloned graph with Mod/Ref info for the callsite.
//
// NOTE: Because this clones a dsgraph and returns it, the caller is responsible
// for deleting the returned graph!
// NOTE: This method may return a null pointer if it is unable to determine the
// requested information (because the call site calls an external
// function or we cannot determine the complete set of functions invoked).
//
DSGraph* FunctionModRefInfo::ResolveCallSiteModRefInfo(CallSite CS,
hash_map<const DSNode*, DSNodeHandle> &NodeMap)
{
// Step #0: Quick check if we are going to fail anyway: avoid
// all the graph cloning and map copying in steps #1 and #2.
//
if (const Function *F = CS.getCalledFunction()) {
if (F->isExternal())
return 0; // We cannot compute Mod/Ref info for this callsite...
} else {
// Eventually, should check here if any callee is external.
// For now we are not handling this case anyway.
std::cerr << "IP Mod/Ref indirect call not implemented yet: "
<< "Being conservative\n";
return 0; // We cannot compute Mod/Ref info for this callsite...
}
// Step #1: Clone the top-down graph...
DSGraph *Result = new DSGraph(*funcTDGraph, NodeMap);
// Step #2: Clear Mod/Ref information...
Result->maskNodeTypes(~(DSNode::Modified | DSNode::Read));
// Step #3: clone the bottom up graphs for the callees into the caller graph
if (Function *F = CS.getCalledFunction())
{
assert(!F->isExternal());
// Build up a DSCallSite for our invocation point here...
// If the call returns a value, make sure to merge the nodes...
DSNodeHandle RetVal;
if (DS::isPointerType(CS.getInstruction()->getType()))
RetVal = Result->getNodeForValue(CS.getInstruction());
// Populate the arguments list...
std::vector<DSNodeHandle> Args;
for (CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end();
I != E; ++I)
if (DS::isPointerType((*I)->getType()))
Args.push_back(Result->getNodeForValue(*I));
// Build the call site...
DSCallSite NCS(CS, RetVal, F, Args);
// Perform the merging now of the graph for the callee, which will
// come with mod/ref bits set...
Result->mergeInGraph(NCS, *F, IPModRefObj.getBUDSGraph(*F),
DSGraph::StripAllocaBit
| DSGraph::DontCloneCallNodes
| DSGraph::DontCloneAuxCallNodes);
}
else
assert(0 && "See error message");
// Remove dead nodes aggressively to match the caller's original graph.
Result->removeDeadNodes(DSGraph::KeepUnreachableGlobals);
// Step #4: Return the clone + the mapping (by ref)
return Result;
}
// Compute Mod/Ref bit vectors for a single call site.
// These are copies of the Read/Write flags from the nodes of
// the graph produced by clearing all flags in the caller's TD graph
// and then inlining the callee's BU graph into the caller's TD graph.
//
void
FunctionModRefInfo::computeModRef(CallSite CS)
{
// Allocate the mod/ref info for the call site. Bits automatically cleared.
ModRefInfo* callModRefInfo = new ModRefInfo(funcTDGraph->getGraphSize());
callSiteModRefInfo[CS.getInstruction()] = callModRefInfo;
// Get a copy of the graph for the callee with the callee inlined
hash_map<const DSNode*, DSNodeHandle> NodeMap;
DSGraph* csgp = ResolveCallSiteModRefInfo(CS, NodeMap);
if (!csgp)
{ // Callee's side effects are unknown: mark all nodes Mod and Ref.
// Eventually this should only mark nodes visible to the callee, i.e.,
// exclude stack variables not reachable from any outgoing argument
// or any global.
callModRefInfo->getModSet().set();
callModRefInfo->getRefSet().set();
return;
}
// For all nodes in the graph, extract the mod/ref information
for (DSGraph::node_iterator NI = funcTDGraph->node_begin(),
E = funcTDGraph->node_end(); NI != E; ++NI) {
DSNode* csgNode = NodeMap[*NI].getNode();
assert(csgNode && "Inlined and original graphs do not correspond!");
if (csgNode->isModified())
callModRefInfo->setNodeIsMod(getNodeId(*NI));
if (csgNode->isRead())
callModRefInfo->setNodeIsRef(getNodeId(*NI));
}
// Drop nodemap before we delete the graph...
NodeMap.clear();
delete csgp;
}
class DSGraphPrintHelper {
const DSGraph& tdGraph;
std::vector<std::vector<const Value*> > knownValues; // identifiable objects
public:
/*ctor*/ DSGraphPrintHelper(const FunctionModRefInfo& fmrInfo)
: tdGraph(fmrInfo.getFuncGraph())
{
knownValues.resize(tdGraph.getGraphSize());
// For every identifiable value, save Value pointer in knownValues[i]
for (hash_map<Value*, DSNodeHandle>::const_iterator
I = tdGraph.getScalarMap().begin(),
E = tdGraph.getScalarMap().end(); I != E; ++I)
if (isa<GlobalValue>(I->first) ||
isa<Argument>(I->first) ||
isa<LoadInst>(I->first) ||
isa<AllocaInst>(I->first) ||
isa<MallocInst>(I->first))
{
unsigned nodeId = fmrInfo.getNodeId(I->second.getNode());
knownValues[nodeId].push_back(I->first);
}
}
void printValuesInBitVec(std::ostream &O, const BitSetVector& bv) const
{
assert(bv.size() == knownValues.size());
if (bv.none())
{ // No bits are set: just say so and return
O << "\tNONE.\n";
return;
}
if (bv.all())
{ // All bits are set: just say so and return
O << "\tALL GRAPH NODES.\n";
return;
}
for (unsigned i=0, N=bv.size(); i < N; ++i)
if (bv.test(i))
{
O << "\tNode# " << i << " : ";
if (! knownValues[i].empty())
for (unsigned j=0, NV=knownValues[i].size(); j < NV; j++)
{
const Value* V = knownValues[i][j];
if (isa<GlobalValue>(V)) O << "(Global) ";
else if (isa<Argument>(V)) O << "(Target of FormalParm) ";
else if (isa<LoadInst>(V)) O << "(Target of LoadInst ) ";
else if (isa<AllocaInst>(V)) O << "(Target of AllocaInst) ";
else if (isa<MallocInst>(V)) O << "(Target of MallocInst) ";
if (V->hasName()) O << V->getName();
else if (isa<Instruction>(V)) O << *V;
else O << "(Value*) 0x" << (void*) V;
O << std::string((j < NV-1)? "; " : "\n");
}
#if 0
else
tdGraph.getNodes()[i]->print(O, /*graph*/ NULL);
#endif
}
}
};
// Print the results of the pass.
// Currently this just prints bit-vectors and is not very readable.
//
void FunctionModRefInfo::print(std::ostream &O) const
{
DSGraphPrintHelper DPH(*this);
O << "========== Mod/ref information for function "
<< F.getName() << "========== \n\n";
// First: Print Globals and Locals modified anywhere in the function.
//
O << " -----Mod/Ref in the body of function " << F.getName()<< ":\n";
O << " --Objects modified in the function body:\n";
DPH.printValuesInBitVec(O, funcModRefInfo.getModSet());
O << " --Objects referenced in the function body:\n";
DPH.printValuesInBitVec(O, funcModRefInfo.getRefSet());
O << " --Mod and Ref vectors for the nodes listed above:\n";
funcModRefInfo.print(O, "\t");
O << "\n";
// Second: Print Globals and Locals modified at each call site in function
//
for (std::map<const Instruction *, ModRefInfo*>::const_iterator
CI = callSiteModRefInfo.begin(), CE = callSiteModRefInfo.end();
CI != CE; ++CI)
{
O << " ----Mod/Ref information for call site\n" << CI->first;
O << " --Objects modified at call site:\n";
DPH.printValuesInBitVec(O, CI->second->getModSet());
O << " --Objects referenced at call site:\n";
DPH.printValuesInBitVec(O, CI->second->getRefSet());
O << " --Mod and Ref vectors for the nodes listed above:\n";
CI->second->print(O, "\t");
O << "\n";
}
O << "\n";
}
void FunctionModRefInfo::dump() const
{
print(std::cerr);
}
//----------------------------------------------------------------------------
// class IPModRef: An interprocedural pass that computes IP Mod/Ref info.
//----------------------------------------------------------------------------
// Free the FunctionModRefInfo objects cached in funcToModRefInfoMap.
//
void IPModRef::releaseMemory()
{
for(std::map<const Function*, FunctionModRefInfo*>::iterator
I=funcToModRefInfoMap.begin(), E=funcToModRefInfoMap.end(); I != E; ++I)
delete(I->second);
// Clear map so memory is not re-released if we are called again
funcToModRefInfoMap.clear();
}
// Run the "interprocedural" pass on each function. This needs to do
// NO real interprocedural work because all that has been done the
// data structure analysis.
//
bool IPModRef::run(Module &theModule)
{
M = &theModule;
for (Module::const_iterator FI = M->begin(), FE = M->end(); FI != FE; ++FI)
if (! FI->isExternal())
getFuncInfo(*FI, /*computeIfMissing*/ true);
return true;
}
FunctionModRefInfo& IPModRef::getFuncInfo(const Function& func,
bool computeIfMissing)
{
FunctionModRefInfo*& funcInfo = funcToModRefInfoMap[&func];
assert (funcInfo != NULL || computeIfMissing);
if (funcInfo == NULL)
{ // Create a new FunctionModRefInfo object.
// Clone the top-down graph and remove any dead nodes first, because
// otherwise original and merged graphs will not match.
// The memory for this graph clone will be freed by FunctionModRefInfo.
DSGraph* funcTDGraph =
new DSGraph(getAnalysis<TDDataStructures>().getDSGraph(func));
funcTDGraph->removeDeadNodes(DSGraph::KeepUnreachableGlobals);
funcInfo = new FunctionModRefInfo(func, *this, funcTDGraph); //auto-insert
funcInfo->computeModRef(func); // computes the mod/ref info
}
return *funcInfo;
}
/// getBUDSGraph - This method returns the BU data structure graph for F through
/// the use of the BUDataStructures object.
///
const DSGraph &IPModRef::getBUDSGraph(const Function &F) {
return getAnalysis<BUDataStructures>().getDSGraph(F);
}
// getAnalysisUsage - This pass requires top-down data structure graphs.
// It modifies nothing.
//
void IPModRef::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<LocalDataStructures>();
AU.addRequired<BUDataStructures>();
AU.addRequired<TDDataStructures>();
}
void IPModRef::print(std::ostream &O) const
{
O << "\nRESULTS OF INTERPROCEDURAL MOD/REF ANALYSIS:\n\n";
for (std::map<const Function*, FunctionModRefInfo*>::const_iterator
mapI = funcToModRefInfoMap.begin(), mapE = funcToModRefInfoMap.end();
mapI != mapE; ++mapI)
mapI->second->print(O);
O << "\n";
}
void IPModRef::dump() const
{
print(std::cerr);
}
} // End llvm namespace

500
lib/Analysis/IPA/MemoryDepAnalysis.cpp
View File

@ -1,500 +0,0 @@
//===- MemoryDepAnalysis.cpp - Compute dep graph for memory ops -----------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
//
// This file implements a pass (MemoryDepAnalysis) that computes memory-based
// data dependences between instructions for each function in a module.
// Memory-based dependences occur due to load and store operations, but
// also the side-effects of call instructions.
//
// The result of this pass is a DependenceGraph for each function
// representing the memory-based data dependences between instructions.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/MemoryDepAnalysis.h"
#include "llvm/Module.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
#include "llvm/Analysis/IPModRef.h"
#include "llvm/Analysis/DataStructure.h"
#include "llvm/Analysis/DSGraph.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/CFG.h"
#include "Support/SCCIterator.h"
#include "Support/Statistic.h"
#include "Support/STLExtras.h"
#include "Support/hash_map"
#include "Support/hash_set"
namespace llvm {
///--------------------------------------------------------------------------
/// struct ModRefTable:
///
/// A data structure that tracks ModRefInfo for instructions:
/// -- modRefMap is a map of Instruction* -> ModRefInfo for the instr.
/// -- definers is a vector of instructions that define any node
/// -- users is a vector of instructions that reference any node
/// -- numUsersBeforeDef is a vector indicating that the number of users
/// seen before definers[i] is numUsersBeforeDef[i].
///
/// numUsersBeforeDef[] effectively tells us the exact interleaving of
/// definers and users within the ModRefTable.
/// This is only maintained when constructing the table for one SCC, and
/// not copied over from one table to another since it is no longer useful.
///--------------------------------------------------------------------------
struct ModRefTable {
typedef hash_map<Instruction*, ModRefInfo> ModRefMap;
typedef ModRefMap::const_iterator const_map_iterator;
typedef ModRefMap:: iterator map_iterator;
typedef std::vector<Instruction*>::const_iterator const_ref_iterator;
typedef std::vector<Instruction*>:: iterator ref_iterator;
ModRefMap modRefMap;
std::vector<Instruction*> definers;
std::vector<Instruction*> users;
std::vector<unsigned> numUsersBeforeDef;
// Iterators to enumerate all the defining instructions
const_ref_iterator defsBegin() const { return definers.begin(); }
ref_iterator defsBegin() { return definers.begin(); }
const_ref_iterator defsEnd() const { return definers.end(); }
ref_iterator defsEnd() { return definers.end(); }
// Iterators to enumerate all the user instructions
const_ref_iterator usersBegin() const { return users.begin(); }
ref_iterator usersBegin() { return users.begin(); }
const_ref_iterator usersEnd() const { return users.end(); }
ref_iterator usersEnd() { return users.end(); }
// Iterator identifying the last user that was seen *before* a
// specified def. In particular, all users in the half-closed range
// [ usersBegin(), usersBeforeDef_End(defPtr) )
// were seen *before* the specified def. All users in the half-closed range
// [ usersBeforeDef_End(defPtr), usersEnd() )
// were seen *after* the specified def.
//
ref_iterator usersBeforeDef_End(const_ref_iterator defPtr) {
unsigned defIndex = (unsigned) (defPtr - defsBegin());
assert(defIndex < numUsersBeforeDef.size());
assert(usersBegin() + numUsersBeforeDef[defIndex] <= usersEnd());
return usersBegin() + numUsersBeforeDef[defIndex];
}
const_ref_iterator usersBeforeDef_End(const_ref_iterator defPtr) const {
return const_cast<ModRefTable*>(this)->usersBeforeDef_End(defPtr);
}
//
// Modifier methods
//
void AddDef(Instruction* D) {
definers.push_back(D);
numUsersBeforeDef.push_back(users.size());
}
void AddUse(Instruction* U) {
users.push_back(U);
}
void Insert(const ModRefTable& fromTable) {
modRefMap.insert(fromTable.modRefMap.begin(), fromTable.modRefMap.end());
definers.insert(definers.end(),
fromTable.definers.begin(), fromTable.definers.end());
users.insert(users.end(),
fromTable.users.begin(), fromTable.users.end());
numUsersBeforeDef.clear(); /* fromTable.numUsersBeforeDef is ignored */
}
};
///--------------------------------------------------------------------------
/// class ModRefInfoBuilder:
///
/// A simple InstVisitor<> class that retrieves the Mod/Ref info for
/// Load/Store/Call instructions and inserts this information in
/// a ModRefTable. It also records all instructions that Mod any node
/// and all that use any node.
///--------------------------------------------------------------------------
class ModRefInfoBuilder : public InstVisitor<ModRefInfoBuilder> {
const DSGraph& funcGraph;
const FunctionModRefInfo& funcModRef;
struct ModRefTable& modRefTable;
ModRefInfoBuilder(); // DO NOT IMPLEMENT
ModRefInfoBuilder(const ModRefInfoBuilder&); // DO NOT IMPLEMENT
void operator=(const ModRefInfoBuilder&); // DO NOT IMPLEMENT
public:
ModRefInfoBuilder(const DSGraph& _funcGraph,
const FunctionModRefInfo& _funcModRef,
ModRefTable& _modRefTable)
: funcGraph(_funcGraph), funcModRef(_funcModRef), modRefTable(_modRefTable)
{
}
// At a call instruction, retrieve the ModRefInfo using IPModRef results.
// Add the call to the defs list if it modifies any nodes and to the uses
// list if it refs any nodes.
//
void visitCallInst(CallInst& callInst) {
ModRefInfo safeModRef(funcGraph.getGraphSize());
const ModRefInfo* callModRef = funcModRef.getModRefInfo(callInst);
if (callModRef == NULL) {
// call to external/unknown function: mark all nodes as Mod and Ref
safeModRef.getModSet().set();
safeModRef.getRefSet().set();
callModRef = &safeModRef;
}
modRefTable.modRefMap.insert(std::make_pair(&callInst,
ModRefInfo(*callModRef)));
if (callModRef->getModSet().any())
modRefTable.AddDef(&callInst);
if (callModRef->getRefSet().any())
modRefTable.AddUse(&callInst);
}
// At a store instruction, add to the mod set the single node pointed to
// by the pointer argument of the store. Interestingly, if there is no
// such node, that would be a null pointer reference!
void visitStoreInst(StoreInst& storeInst) {
const DSNodeHandle& ptrNode =
funcGraph.getNodeForValue(storeInst.getPointerOperand());
if (const DSNode* target = ptrNode.getNode()) {
unsigned nodeId = funcModRef.getNodeId(target);
ModRefInfo& minfo =
modRefTable.modRefMap.insert(
std::make_pair(&storeInst,
ModRefInfo(funcGraph.getGraphSize()))).first->second;
minfo.setNodeIsMod(nodeId);
modRefTable.AddDef(&storeInst);
} else
std::cerr << "Warning: Uninitialized pointer reference!\n";
}
// At a load instruction, add to the ref set the single node pointed to
// by the pointer argument of the load. Interestingly, if there is no
// such node, that would be a null pointer reference!
void visitLoadInst(LoadInst& loadInst) {
const DSNodeHandle& ptrNode =
funcGraph.getNodeForValue(loadInst.getPointerOperand());
if (const DSNode* target = ptrNode.getNode()) {
unsigned nodeId = funcModRef.getNodeId(target);
ModRefInfo& minfo =
modRefTable.modRefMap.insert(
std::make_pair(&loadInst,
ModRefInfo(funcGraph.getGraphSize()))).first->second;
minfo.setNodeIsRef(nodeId);
modRefTable.AddUse(&loadInst);
} else
std::cerr << "Warning: Uninitialized pointer reference!\n";
}
};
//----------------------------------------------------------------------------
// class MemoryDepAnalysis: A dep. graph for load/store/call instructions
//----------------------------------------------------------------------------
/// getAnalysisUsage - This does not modify anything. It uses the Top-Down DS
/// Graph and IPModRef.
///
void MemoryDepAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<TDDataStructures>();
AU.addRequired<IPModRef>();
}
/// Basic dependence gathering algorithm, using scc_iterator on CFG:
///
/// for every SCC S in the CFG in PostOrder on the SCC DAG
/// {
/// for every basic block BB in S in *postorder*
/// for every instruction I in BB in reverse
/// Add (I, ModRef[I]) to ModRefCurrent
/// if (Mod[I] != NULL)
/// Add I to DefSetCurrent: { I \in S : Mod[I] != NULL }
/// if (Ref[I] != NULL)
/// Add I to UseSetCurrent: { I : Ref[I] != NULL }
///
/// for every def D in DefSetCurrent
///
/// // NOTE: D comes after itself iff S contains a loop
/// if (HasLoop(S) && D & D)
/// Add output-dep: D -> D2
///
/// for every def D2 *after* D in DefSetCurrent
/// // NOTE: D2 comes before D in execution order
/// if (D & D2)
/// Add output-dep: D2 -> D
/// if (HasLoop(S))
/// Add output-dep: D -> D2
///
/// for every use U in UseSetCurrent that was seen *before* D
/// // NOTE: U comes after D in execution order
/// if (U & D)
/// if (U != D || HasLoop(S))
/// Add true-dep: D -> U
/// if (HasLoop(S))
/// Add anti-dep: U -> D
///
/// for every use U in UseSetCurrent that was seen *after* D
/// // NOTE: U comes before D in execution order
/// if (U & D)
/// if (U != D || HasLoop(S))
/// Add anti-dep: U -> D
/// if (HasLoop(S))
/// Add true-dep: D -> U
///
/// for every def Dnext in DefSetAfter
/// // NOTE: Dnext comes after D in execution order
/// if (Dnext & D)
/// Add output-dep: D -> Dnext
///
/// for every use Unext in UseSetAfter
/// // NOTE: Unext comes after D in execution order
/// if (Unext & D)
/// Add true-dep: D -> Unext
///
/// for every use U in UseSetCurrent
/// for every def Dnext in DefSetAfter
/// // NOTE: Dnext comes after U in execution order
/// if (Dnext & D)
/// Add anti-dep: U -> Dnext
///
/// Add ModRefCurrent to ModRefAfter: { (I, ModRef[I] ) }
/// Add DefSetCurrent to DefSetAfter: { I : Mod[I] != NULL }
/// Add UseSetCurrent to UseSetAfter: { I : Ref[I] != NULL }
/// }
///
///
void MemoryDepAnalysis::ProcessSCC(std::vector<BasicBlock*> &S,
ModRefTable& ModRefAfter, bool hasLoop) {
ModRefTable ModRefCurrent;
ModRefTable::ModRefMap& mapCurrent = ModRefCurrent.modRefMap;
ModRefTable::ModRefMap& mapAfter = ModRefAfter.modRefMap;
// Builder class fills out a ModRefTable one instruction at a time.
// To use it, we just invoke it's visit function for each basic block:
//
// for each basic block BB in the SCC in *postorder*
// for each instruction I in BB in *reverse*
// ModRefInfoBuilder::visit(I)
// : Add (I, ModRef[I]) to ModRefCurrent.modRefMap
// : Add I to ModRefCurrent.definers if it defines any node
// : Add I to ModRefCurrent.users if it uses any node
//
ModRefInfoBuilder builder(*funcGraph, *funcModRef, ModRefCurrent);
for (std::vector<BasicBlock*>::iterator BI = S.begin(), BE = S.end();
BI != BE; ++BI)
// Note: BBs in the SCC<> created by scc_iterator are in postorder.
for (BasicBlock::reverse_iterator II=(*BI)->rbegin(), IE=(*BI)->rend();
II != IE; ++II)
builder.visit(*II);
/// for every def D in DefSetCurrent
///
for (ModRefTable::ref_iterator II=ModRefCurrent.defsBegin(),
IE=ModRefCurrent.defsEnd(); II != IE; ++II)
{
/// // NOTE: D comes after itself iff S contains a loop
/// if (HasLoop(S))
/// Add output-dep: D -> D2
if (hasLoop)
funcDepGraph->AddSimpleDependence(**II, **II, OutputDependence);
/// for every def D2 *after* D in DefSetCurrent
/// // NOTE: D2 comes before D in execution order
/// if (D2 & D)
/// Add output-dep: D2 -> D
/// if (HasLoop(S))
/// Add output-dep: D -> D2
for (ModRefTable::ref_iterator JI=II+1; JI != IE; ++JI)
if (!Disjoint(mapCurrent.find(*II)->second.getModSet(),
mapCurrent.find(*JI)->second.getModSet()))
{
funcDepGraph->AddSimpleDependence(**JI, **II, OutputDependence);
if (hasLoop)
funcDepGraph->AddSimpleDependence(**II, **JI, OutputDependence);
}
/// for every use U in UseSetCurrent that was seen *before* D
/// // NOTE: U comes after D in execution order
/// if (U & D)
/// if (U != D || HasLoop(S))
/// Add true-dep: U -> D
/// if (HasLoop(S))
/// Add anti-dep: D -> U
ModRefTable::ref_iterator JI=ModRefCurrent.usersBegin();
ModRefTable::ref_iterator JE = ModRefCurrent.usersBeforeDef_End(II);
for ( ; JI != JE; ++JI)
if (!Disjoint(mapCurrent.find(*II)->second.getModSet(),
mapCurrent.find(*JI)->second.getRefSet()))
{
if (*II != *JI || hasLoop)
funcDepGraph->AddSimpleDependence(**II, **JI, TrueDependence);
if (hasLoop)
funcDepGraph->AddSimpleDependence(**JI, **II, AntiDependence);
}
/// for every use U in UseSetCurrent that was seen *after* D
/// // NOTE: U comes before D in execution order
/// if (U & D)
/// if (U != D || HasLoop(S))
/// Add anti-dep: U -> D
/// if (HasLoop(S))
/// Add true-dep: D -> U
for (/*continue JI*/ JE = ModRefCurrent.usersEnd(); JI != JE; ++JI)
if (!Disjoint(mapCurrent.find(*II)->second.getModSet(),
mapCurrent.find(*JI)->second.getRefSet()))
{
if (*II != *JI || hasLoop)
funcDepGraph->AddSimpleDependence(**JI, **II, AntiDependence);
if (hasLoop)
funcDepGraph->AddSimpleDependence(**II, **JI, TrueDependence);
}
/// for every def Dnext in DefSetPrev
/// // NOTE: Dnext comes after D in execution order
/// if (Dnext & D)
/// Add output-dep: D -> Dnext
for (ModRefTable::ref_iterator JI=ModRefAfter.defsBegin(),
JE=ModRefAfter.defsEnd(); JI != JE; ++JI)
if (!Disjoint(mapCurrent.find(*II)->second.getModSet(),
mapAfter.find(*JI)->second.getModSet()))
funcDepGraph->AddSimpleDependence(**II, **JI, OutputDependence);
/// for every use Unext in UseSetAfter
/// // NOTE: Unext comes after D in execution order
/// if (Unext & D)
/// Add true-dep: D -> Unext
for (ModRefTable::ref_iterator JI=ModRefAfter.usersBegin(),
JE=ModRefAfter.usersEnd(); JI != JE; ++JI)
if (!Disjoint(mapCurrent.find(*II)->second.getModSet(),
mapAfter.find(*JI)->second.getRefSet()))
funcDepGraph->AddSimpleDependence(**II, **JI, TrueDependence);
}
///
/// for every use U in UseSetCurrent
/// for every def Dnext in DefSetAfter
/// // NOTE: Dnext comes after U in execution order
/// if (Dnext & D)
/// Add anti-dep: U -> Dnext
for (ModRefTable::ref_iterator II=ModRefCurrent.usersBegin(),
IE=ModRefCurrent.usersEnd(); II != IE; ++II)
for (ModRefTable::ref_iterator JI=ModRefAfter.defsBegin(),
JE=ModRefAfter.defsEnd(); JI != JE; ++JI)
if (!Disjoint(mapCurrent.find(*II)->second.getRefSet(),
mapAfter.find(*JI)->second.getModSet()))
funcDepGraph->AddSimpleDependence(**II, **JI, AntiDependence);
/// Add ModRefCurrent to ModRefAfter: { (I, ModRef[I] ) }
/// Add DefSetCurrent to DefSetAfter: { I : Mod[I] != NULL }
/// Add UseSetCurrent to UseSetAfter: { I : Ref[I] != NULL }
ModRefAfter.Insert(ModRefCurrent);
}
/// Debugging support methods
///
void MemoryDepAnalysis::print(std::ostream &O) const
{
// TEMPORARY LOOP
for (hash_map<Function*, DependenceGraph*>::const_iterator
I = funcMap.begin(), E = funcMap.end(); I != E; ++I)
{
Function* func = I->first;
DependenceGraph* depGraph = I->second;
O << "\n================================================================\n";
O << "DEPENDENCE GRAPH FOR MEMORY OPERATIONS IN FUNCTION " << func->getName();
O << "\n================================================================\n\n";
depGraph->print(*func, O);
}
}
///
/// Run the pass on a function
///
bool MemoryDepAnalysis::runOnFunction(Function &F) {
assert(!F.isExternal());
// Get the FunctionModRefInfo holding IPModRef results for this function.
// Use the TD graph recorded within the FunctionModRefInfo object, which
// may not be the same as the original TD graph computed by DS analysis.
//
funcModRef = &getAnalysis<IPModRef>().getFunctionModRefInfo(F);
funcGraph = &funcModRef->getFuncGraph();
// TEMPORARY: ptr to depGraph (later just becomes "this").
assert(!funcMap.count(&F) && "Analyzing function twice?");
funcDepGraph = funcMap[&F] = new DependenceGraph();
ModRefTable ModRefAfter;
for (scc_iterator<Function*> I = scc_begin(&F), E = scc_end(&F); I != E; ++I)
ProcessSCC(*I, ModRefAfter, I.hasLoop());
return true;
}
//-------------------------------------------------------------------------
// TEMPORARY FUNCTIONS TO MAKE THIS A MODULE PASS ---
// These functions will go away once this class becomes a FunctionPass.
//
// Driver function to compute dependence graphs for every function.
// This is temporary and will go away once this is a FunctionPass.
//
bool MemoryDepAnalysis::run(Module& M)
{
for (Module::iterator FI = M.begin(), FE = M.end(); FI != FE; ++FI)
if (! FI->isExternal())
runOnFunction(*FI); // automatically inserts each depGraph into funcMap
return true;
}
// Release all the dependence graphs in the map.
void MemoryDepAnalysis::releaseMemory()
{
for (hash_map<Function*, DependenceGraph*>::const_iterator
I = funcMap.begin(), E = funcMap.end(); I != E; ++I)
delete I->second;
funcMap.clear();
// Clear pointers because the pass constructor will not be invoked again.
funcDepGraph = NULL;
funcGraph = NULL;
funcModRef = NULL;
}
MemoryDepAnalysis::~MemoryDepAnalysis()
{
releaseMemory();
}
//----END TEMPORARY FUNCTIONS----------------------------------------------
void MemoryDepAnalysis::dump() const
{
this->print(std::cerr);
}
static RegisterAnalysis<MemoryDepAnalysis>
Z("memdep", "Memory Dependence Analysis");
} // End llvm namespace