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//== AnalysisContext.cpp - Analysis context for Path Sens analysis -*- C++ -*-//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines AnalysisContext, a class that manages the analysis context
// data for path sensitive analysis.
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/PathSensitive/AnalysisContext.h"
#include "clang/Analysis/Analyses/LiveVariables.h"
#include "clang/Analysis/CFG.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/ParentMap.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Analysis/Support/BumpVector.h"
#include "llvm/Support/ErrorHandling.h"
using namespace clang;
void AnalysisContextManager::clear() {
for (ContextMap::iterator I = Contexts.begin(), E = Contexts.end(); I!=E; ++I)
delete I->second;
Contexts.clear();
}
Stmt *AnalysisContext::getBody() {
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
return FD->getBody();
else if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->getBody();
llvm::llvm_unreachable("unknown code decl");
}
const ImplicitParamDecl *AnalysisContext::getSelfDecl() const {
if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->getSelfDecl();
return NULL;
}
CFG *AnalysisContext::getCFG() {
if (!cfg)
cfg = CFG::buildCFG(getBody(), &D->getASTContext());
return cfg;
}
ParentMap &AnalysisContext::getParentMap() {
if (!PM)
PM = new ParentMap(getBody());
return *PM;
}
LiveVariables *AnalysisContext::getLiveVariables() {
if (!liveness) {
CFG *c = getCFG();
if (!c)
return 0;
liveness = new LiveVariables(*this);
liveness->runOnCFG(*c);
liveness->runOnAllBlocks(*c, 0, true);
}
return liveness;
}
AnalysisContext *AnalysisContextManager::getContext(const Decl *D) {
AnalysisContext *&AC = Contexts[D];
if (!AC)
AC = new AnalysisContext(D);
return AC;
}
void LocationContext::Profile(llvm::FoldingSetNodeID &ID, ContextKind k,
AnalysisContext *ctx,
const LocationContext *parent) {
ID.AddInteger(k);
ID.AddPointer(ctx);
ID.AddPointer(parent);
}
void StackFrameContext::Profile(llvm::FoldingSetNodeID &ID,AnalysisContext *ctx,
const LocationContext *parent, const Stmt *s) {
LocationContext::Profile(ID, StackFrame, ctx, parent);
ID.AddPointer(s);
}
void ScopeContext::Profile(llvm::FoldingSetNodeID &ID, AnalysisContext *ctx,
const LocationContext *parent, const Stmt *s) {
LocationContext::Profile(ID, Scope, ctx, parent);
ID.AddPointer(s);
}
LocationContextManager::~LocationContextManager() {
clear();
}
void LocationContextManager::clear() {
for (llvm::FoldingSet<LocationContext>::iterator I = Contexts.begin(),
E = Contexts.end(); I != E; ) {
LocationContext *LC = &*I;
++I;
delete LC;
}
Contexts.clear();
}
StackFrameContext*
LocationContextManager::getStackFrame(AnalysisContext *ctx,
const LocationContext *parent,
const Stmt *s) {
llvm::FoldingSetNodeID ID;
StackFrameContext::Profile(ID, ctx, parent, s);
void *InsertPos;
StackFrameContext *f =
cast_or_null<StackFrameContext>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
if (!f) {
f = new StackFrameContext(ctx, parent, s);
Contexts.InsertNode(f, InsertPos);
}
return f;
}
ScopeContext *LocationContextManager::getScope(AnalysisContext *ctx,
const LocationContext *parent,
const Stmt *s) {
llvm::FoldingSetNodeID ID;
ScopeContext::Profile(ID, ctx, parent, s);
void *InsertPos;
ScopeContext *scope =
cast_or_null<ScopeContext>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
if (!scope) {
scope = new ScopeContext(ctx, parent, s);
Contexts.InsertNode(scope, InsertPos);
}
return scope;
}
//===----------------------------------------------------------------------===//
// Lazily generated map to query the external variables referenced by a Block.
//===----------------------------------------------------------------------===//
namespace {
class FindBlockDeclRefExprsVals : public StmtVisitor<FindBlockDeclRefExprsVals>{
BumpVector<const VarDecl*> &BEVals;
BumpVectorContext &BC;
public:
FindBlockDeclRefExprsVals(BumpVector<const VarDecl*> &bevals,
BumpVectorContext &bc)
: BEVals(bevals), BC(bc) {}
void VisitStmt(Stmt *S) {
for (Stmt::child_iterator I = S->child_begin(), E = S->child_end();I!=E;++I)
if (Stmt *child = *I)
Visit(child);
}
void VisitBlockDeclRefExpr(BlockDeclRefExpr *DR) {
if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl()))
BEVals.push_back(VD, BC);
}
};
} // end anonymous namespace
typedef BumpVector<const VarDecl*> DeclVec;
static DeclVec* LazyInitializeReferencedDecls(const BlockDecl *BD,
void *&Vec,
llvm::BumpPtrAllocator &A) {
if (Vec)
return (DeclVec*) Vec;
BumpVectorContext BC(A);
DeclVec *BV = (DeclVec*) A.Allocate<DeclVec>();
new (BV) DeclVec(BC, 10);
// Find the referenced variables.
FindBlockDeclRefExprsVals F(*BV, BC);
F.Visit(BD->getBody());
Vec = BV;
return BV;
}
std::pair<AnalysisContext::referenced_decls_iterator,
AnalysisContext::referenced_decls_iterator>
AnalysisContext::getReferencedBlockVars(const BlockDecl *BD) {
if (!ReferencedBlockVars)
ReferencedBlockVars = new llvm::DenseMap<const BlockDecl*,void*>();
DeclVec *V = LazyInitializeReferencedDecls(BD, (*ReferencedBlockVars)[BD], A);
return std::make_pair(V->begin(), V->end());
}
//===----------------------------------------------------------------------===//
// Cleanup.
//===----------------------------------------------------------------------===//
AnalysisContext::~AnalysisContext() {
delete cfg;
delete liveness;
delete PM;
delete ReferencedBlockVars;
}
AnalysisContextManager::~AnalysisContextManager() {
for (ContextMap::iterator I = Contexts.begin(), E = Contexts.end(); I!=E; ++I)
delete I->second;
}
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