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//== Environment.h - Map from Expr* to Locations/Values ---------*- C++ -*--==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defined the Environment and EnvironmentManager classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_ENVIRONMENT_H
#define LLVM_CLANG_ANALYSIS_ENVIRONMENT_H
#include "llvm/ADT/ImmutableMap.h"
#include "clang/Analysis/PathSensitive/RValues.h"
#include "llvm/Support/Allocator.h"
#include "llvm/ADT/FoldingSet.h"
namespace clang {
class EnvironmentManager;
class Environment : public llvm::FoldingSetNode {
private:
friend class EnvironmentManager;
// Type definitions.
typedef llvm::ImmutableMap<Expr*,RVal> BindingsTy;
// Data.
BindingsTy SubExprBindings;
BindingsTy BlkExprBindings;
Environment(BindingsTy seb, BindingsTy beb)
: SubExprBindings(seb), BlkExprBindings(beb) {}
public:
typedef BindingsTy::iterator seb_iterator;
seb_iterator seb_begin() const { return SubExprBindings.begin(); }
seb_iterator seb_end() const { return SubExprBindings.end(); }
typedef BindingsTy::iterator beb_iterator;
beb_iterator beb_begin() const { return BlkExprBindings.begin(); }
beb_iterator beb_end() const { return BlkExprBindings.end(); }
RVal LookupSubExpr(Expr* E) const {
const RVal* X = SubExprBindings.lookup(E);
return X ? *X : UnknownVal();
}
RVal LookupBlkExpr(Expr* E) const {
const RVal* X = BlkExprBindings.lookup(E);
return X ? *X : UnknownVal();
}
RVal LookupExpr(Expr* E) const {
const RVal* X = SubExprBindings.lookup(E);
if (X) return *X;
X = BlkExprBindings.lookup(E);
return X ? *X : UnknownVal();
}
/// Profile - Profile the contents of an Environment object for use
/// in a FoldingSet.
static void Profile(llvm::FoldingSetNodeID& ID, const Environment* E) {
E->SubExprBindings.Profile(ID);
E->BlkExprBindings.Profile(ID);
}
/// Profile - Used to profile the contents of this object for inclusion
/// in a FoldingSet.
void Profile(llvm::FoldingSetNodeID& ID) const {
Profile(ID, this);
}
};
class EnvironmentManager {
private:
typedef Environment::BindingsTy::Factory FactoryTy;
FactoryTy F;
public:
EnvironmentManager(llvm::BumpPtrAllocator& Allocator) : F(Allocator) {}
~EnvironmentManager() {}
/// RemoveBlkExpr - Return a new environment object with the same bindings as
/// the provided environment except with any bindings for the provided Expr*
/// removed. This method only removes bindings for block-level expressions.
/// Using this method on a non-block level expression will return the
/// same environment object.
Environment RemoveBlkExpr(const Environment& Env, Expr* E) {
return Environment(Env.SubExprBindings, F.Remove(Env.BlkExprBindings, E));
}
Environment RemoveSubExpr(const Environment& Env, Expr* E) {
return Environment(F.Remove(Env.SubExprBindings, E), Env.BlkExprBindings);
}
Environment AddBlkExpr(const Environment& Env, Expr* E, RVal V) {
return Environment(Env.SubExprBindings, F.Add(Env.BlkExprBindings, E, V));
}
Environment AddSubExpr(const Environment& Env, Expr* E, RVal V) {
return Environment(F.Add(Env.SubExprBindings, E, V), Env.BlkExprBindings);
}
/// RemoveSubExprBindings - Return a new environment object with
/// the same bindings as the provided environment except with all the
/// subexpression bindings removed.
Environment RemoveSubExprBindings(const Environment& Env) {
return Environment(F.GetEmptyMap(), Env.BlkExprBindings);
}
Environment getInitialEnvironment() {
return Environment(F.GetEmptyMap(), F.GetEmptyMap());
}
};
} // end clang namespace
#endif
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