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//===- CheckTypes.h - Verify PNaCl ABI rules --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common type-checking code for module and function-level passes
//
//
//===----------------------------------------------------------------------===//
#ifndef LIB_ANALYSIS_NACL_CHECKTYPES_H
#define LIB_ANALYSIS_NACL_CHECKTYPES_H
#include "llvm/ADT/DenseSet.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Support/raw_ostream.h"
class TypeChecker {
public:
bool IsValidType(const llvm::Type* Ty) {
if (VisitedTypes.count(Ty))
return VisitedTypes[Ty];
unsigned Width;
bool Valid = false;
switch (Ty->getTypeID()) {
// Allowed primitive types
case llvm::Type::VoidTyID:
case llvm::Type::FloatTyID:
case llvm::Type::DoubleTyID:
case llvm::Type::LabelTyID:
case llvm::Type::MetadataTyID:
Valid = true;
break;
// Disallowed primitive types
case llvm::Type::HalfTyID:
case llvm::Type::X86_FP80TyID:
case llvm::Type::FP128TyID:
case llvm::Type::PPC_FP128TyID:
case llvm::Type::X86_MMXTyID:
Valid = false;
break;
// Derived types
case llvm::Type::VectorTyID:
Valid = false;
break;
case llvm::Type::IntegerTyID:
Width = llvm::cast<const llvm::IntegerType>(Ty)->getBitWidth();
Valid = (Width == 1 || Width == 8 || Width == 16 ||
Width == 32 || Width == 64);
break;
case llvm::Type::FunctionTyID:
case llvm::Type::StructTyID:
case llvm::Type::ArrayTyID:
case llvm::Type::PointerTyID:
// These types are valid if their contained or pointed-to types are
// valid. Since struct/pointer subtype relationships may be circular,
// mark the current type as valid to avoid infinite recursion
Valid = true;
VisitedTypes[Ty] = true;
for (llvm::Type::subtype_iterator I = Ty->subtype_begin(),
E = Ty->subtype_end(); I != E; ++I)
Valid &= IsValidType(*I);
break;
// Handle NumTypeIDs, and no default case,
// so we get a warning if new types are added
case llvm::Type::NumTypeIDs:
Valid = false;
break;
}
VisitedTypes[Ty] = Valid;
return Valid;
}
bool CheckTypesInValue(const llvm::Value* V) {
// TODO: Checking types in values probably belongs in its
// own value checker which also handles the various types of
// constexpr (in particular, blockaddr constexprs cause this code
// to assert rather than go off and try to verify the BBs of a function)
// But this code is in a good consistent checkpoint-able state.
assert(llvm::isa<llvm::Constant>(V));
if (VisitedConstants.count(V))
return VisitedConstants[V];
bool Valid = IsValidType(V->getType());
VisitedConstants[V] = Valid;
const llvm::User *U = llvm::cast<llvm::User>(V);
for (llvm::Constant::const_op_iterator I = U->op_begin(),
E = U->op_end(); I != E; ++I)
Valid &= CheckTypesInValue(*I);
VisitedConstants[V] = Valid;
return Valid;
}
private:
// To avoid walking constexprs and types multiple times, keep a cache of
// what we have seen. This is also used to prevent infinite recursion e.g.
// in case of structures like linked lists with pointers to themselves.
llvm::DenseMap<const llvm::Value*, bool> VisitedConstants;
llvm::DenseMap<const llvm::Type*, bool> VisitedTypes;
};
#endif // LIB_ANALYSIS_NACL_CHECKTYPES_H
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