mirror of
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511 lines
17 KiB
C++
511 lines
17 KiB
C++
//===-- Constants.cpp - Implement Constant nodes -----------------*- C++ -*--=//
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//
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// This file implements the Constant* classes...
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//
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//===----------------------------------------------------------------------===//
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#define __STDC_LIMIT_MACROS // Get defs for INT64_MAX and friends...
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/iMemory.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Module.h"
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#include "llvm/SlotCalculator.h"
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#include "Support/StringExtras.h"
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#include <algorithm>
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using std::map;
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using std::pair;
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using std::make_pair;
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using std::vector;
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ConstantBool *ConstantBool::True = new ConstantBool(true);
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ConstantBool *ConstantBool::False = new ConstantBool(false);
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//===----------------------------------------------------------------------===//
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// Constant Class
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//===----------------------------------------------------------------------===//
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// Specialize setName to take care of symbol table majik
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void Constant::setName(const std::string &Name, SymbolTable *ST) {
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assert(ST && "Type::setName - Must provide symbol table argument!");
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if (Name.size()) ST->insert(Name, this);
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}
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// Static constructor to create a '0' constant of arbitrary type...
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Constant *Constant::getNullValue(const Type *Ty) {
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switch (Ty->getPrimitiveID()) {
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case Type::BoolTyID: return ConstantBool::get(false);
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case Type::SByteTyID:
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case Type::ShortTyID:
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case Type::IntTyID:
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case Type::LongTyID: return ConstantSInt::get(Ty, 0);
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case Type::UByteTyID:
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case Type::UShortTyID:
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case Type::UIntTyID:
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case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
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case Type::FloatTyID:
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case Type::DoubleTyID: return ConstantFP::get(Ty, 0);
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case Type::PointerTyID:
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return ConstantPointerNull::get(cast<PointerType>(Ty));
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default:
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return 0;
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}
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}
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void Constant::destroyConstantImpl() {
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// When a Constant is destroyed, there may be lingering
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// references to the constant by other constants in the constant pool. These
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// constants are implicitly dependant on the module that is being deleted,
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// but they don't know that. Because we only find out when the CPV is
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// deleted, we must now notify all of our users (that should only be
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// Constants) that they are, in fact, invalid now and should be deleted.
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//
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while (!use_empty()) {
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Value *V = use_back();
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#ifndef NDEBUG // Only in -g mode...
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if (!isa<Constant>(V))
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std::cerr << "While deleting: " << *this
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<< "\n\nUse still stuck around after Def is destroyed: "
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<< *V << "\n\n";
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#endif
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assert(isa<Constant>(V) && "References remain to Constant being destroyed");
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Constant *CPV = cast<Constant>(V);
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CPV->destroyConstant();
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// The constant should remove itself from our use list...
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assert((use_empty() || use_back() != V) && "Constant not removed!");
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}
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// Value has no outstanding references it is safe to delete it now...
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delete this;
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}
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//===----------------------------------------------------------------------===//
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// ConstantXXX Classes
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// Normal Constructors
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ConstantBool::ConstantBool(bool V) : Constant(Type::BoolTy) {
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Val = V;
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}
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ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : Constant(Ty) {
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Val.Unsigned = V;
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}
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ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) {
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assert(isValueValidForType(Ty, V) && "Value too large for type!");
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}
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ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V) : ConstantInt(Ty, V) {
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assert(isValueValidForType(Ty, V) && "Value too large for type!");
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}
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ConstantFP::ConstantFP(const Type *Ty, double V) : Constant(Ty) {
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assert(isValueValidForType(Ty, V) && "Value too large for type!");
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Val = V;
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}
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ConstantArray::ConstantArray(const ArrayType *T,
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const std::vector<Constant*> &V) : Constant(T) {
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for (unsigned i = 0; i < V.size(); i++) {
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assert(V[i]->getType() == T->getElementType());
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Operands.push_back(Use(V[i], this));
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}
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}
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ConstantStruct::ConstantStruct(const StructType *T,
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const std::vector<Constant*> &V) : Constant(T) {
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const StructType::ElementTypes &ETypes = T->getElementTypes();
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assert(V.size() == ETypes.size() &&
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"Invalid initializer vector for constant structure");
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for (unsigned i = 0; i < V.size(); i++) {
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assert(V[i]->getType() == ETypes[i]);
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Operands.push_back(Use(V[i], this));
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}
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}
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ConstantPointerRef::ConstantPointerRef(GlobalValue *GV)
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: ConstantPointer(GV->getType()) {
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Operands.push_back(Use(GV, this));
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}
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ConstantExpr::ConstantExpr(unsigned opCode, Constant *C, const Type *Ty)
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: Constant(Ty), iType(opCode) {
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Operands.push_back(Use(C, this));
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}
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ConstantExpr::ConstantExpr(unsigned opCode, Constant* C1,
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Constant* C2, const Type *Ty)
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: Constant(Ty), iType(opCode) {
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Operands.push_back(Use(C1, this));
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Operands.push_back(Use(C2, this));
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}
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ConstantExpr::ConstantExpr(unsigned opCode, Constant* C,
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const std::vector<Constant*> &IdxList, const Type *Ty)
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: Constant(Ty), iType(opCode) {
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Operands.reserve(1+IdxList.size());
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Operands.push_back(Use(C, this));
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for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
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Operands.push_back(Use(IdxList[i], this));
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}
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//===----------------------------------------------------------------------===//
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// classof implementations
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bool ConstantInt::classof(const Constant *CPV) {
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return CPV->getType()->isIntegral() && !isa<ConstantExpr>(CPV);
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}
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bool ConstantSInt::classof(const Constant *CPV) {
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return CPV->getType()->isSigned() && !isa<ConstantExpr>(CPV);
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}
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bool ConstantUInt::classof(const Constant *CPV) {
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return CPV->getType()->isUnsigned() && !isa<ConstantExpr>(CPV);
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}
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bool ConstantFP::classof(const Constant *CPV) {
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const Type *Ty = CPV->getType();
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return ((Ty == Type::FloatTy || Ty == Type::DoubleTy) &&
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!isa<ConstantExpr>(CPV));
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}
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bool ConstantArray::classof(const Constant *CPV) {
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return isa<ArrayType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
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}
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bool ConstantStruct::classof(const Constant *CPV) {
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return isa<StructType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
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}
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bool ConstantPointer::classof(const Constant *CPV) {
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return (isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV));
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}
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//===----------------------------------------------------------------------===//
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// isValueValidForType implementations
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bool ConstantSInt::isValueValidForType(const Type *Ty, int64_t Val) {
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switch (Ty->getPrimitiveID()) {
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default:
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return false; // These can't be represented as integers!!!
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// Signed types...
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case Type::SByteTyID:
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return (Val <= INT8_MAX && Val >= INT8_MIN);
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case Type::ShortTyID:
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return (Val <= INT16_MAX && Val >= INT16_MIN);
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case Type::IntTyID:
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return (Val <= INT32_MAX && Val >= INT32_MIN);
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case Type::LongTyID:
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return true; // This is the largest type...
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}
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assert(0 && "WTF?");
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return false;
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}
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bool ConstantUInt::isValueValidForType(const Type *Ty, uint64_t Val) {
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switch (Ty->getPrimitiveID()) {
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default:
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return false; // These can't be represented as integers!!!
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// Unsigned types...
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case Type::UByteTyID:
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return (Val <= UINT8_MAX);
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case Type::UShortTyID:
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return (Val <= UINT16_MAX);
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case Type::UIntTyID:
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return (Val <= UINT32_MAX);
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case Type::ULongTyID:
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return true; // This is the largest type...
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}
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assert(0 && "WTF?");
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return false;
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}
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bool ConstantFP::isValueValidForType(const Type *Ty, double Val) {
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switch (Ty->getPrimitiveID()) {
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default:
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return false; // These can't be represented as floating point!
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// TODO: Figure out how to test if a double can be cast to a float!
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case Type::FloatTyID:
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/*
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return (Val <= UINT8_MAX);
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*/
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case Type::DoubleTyID:
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return true; // This is the largest type...
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}
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};
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//===----------------------------------------------------------------------===//
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// Factory Function Implementation
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template<class ValType, class ConstantClass>
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struct ValueMap {
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typedef pair<const Type*, ValType> ConstHashKey;
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map<ConstHashKey, ConstantClass *> Map;
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inline ConstantClass *get(const Type *Ty, ValType V) {
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map<ConstHashKey,ConstantClass *>::iterator I =
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Map.find(ConstHashKey(Ty, V));
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return (I != Map.end()) ? I->second : 0;
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}
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inline void add(const Type *Ty, ValType V, ConstantClass *CP) {
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Map.insert(make_pair(ConstHashKey(Ty, V), CP));
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}
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inline void remove(ConstantClass *CP) {
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for (map<ConstHashKey,ConstantClass *>::iterator I = Map.begin(),
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E = Map.end(); I != E;++I)
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if (I->second == CP) {
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Map.erase(I);
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return;
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}
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}
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};
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//---- ConstantUInt::get() and ConstantSInt::get() implementations...
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//
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static ValueMap<uint64_t, ConstantInt> IntConstants;
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ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
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ConstantSInt *Result = (ConstantSInt*)IntConstants.get(Ty, (uint64_t)V);
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if (!Result) // If no preexisting value, create one now...
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IntConstants.add(Ty, V, Result = new ConstantSInt(Ty, V));
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return Result;
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}
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ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
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ConstantUInt *Result = (ConstantUInt*)IntConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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IntConstants.add(Ty, V, Result = new ConstantUInt(Ty, V));
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return Result;
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}
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ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
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assert(V <= 127 && "Can only be used with very small positive constants!");
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if (Ty->isSigned()) return ConstantSInt::get(Ty, V);
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return ConstantUInt::get(Ty, V);
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}
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//---- ConstantFP::get() implementation...
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//
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static ValueMap<double, ConstantFP> FPConstants;
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ConstantFP *ConstantFP::get(const Type *Ty, double V) {
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ConstantFP *Result = FPConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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FPConstants.add(Ty, V, Result = new ConstantFP(Ty, V));
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return Result;
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}
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//---- ConstantArray::get() implementation...
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//
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static ValueMap<std::vector<Constant*>, ConstantArray> ArrayConstants;
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ConstantArray *ConstantArray::get(const ArrayType *Ty,
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const std::vector<Constant*> &V) {
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ConstantArray *Result = ArrayConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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ArrayConstants.add(Ty, V, Result = new ConstantArray(Ty, V));
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return Result;
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}
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// ConstantArray::get(const string&) - Return an array that is initialized to
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// contain the specified string. A null terminator is added to the specified
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// string so that it may be used in a natural way...
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//
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ConstantArray *ConstantArray::get(const std::string &Str) {
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std::vector<Constant*> ElementVals;
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for (unsigned i = 0; i < Str.length(); ++i)
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ElementVals.push_back(ConstantSInt::get(Type::SByteTy, Str[i]));
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// Add a null terminator to the string...
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ElementVals.push_back(ConstantSInt::get(Type::SByteTy, 0));
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ArrayType *ATy = ArrayType::get(Type::SByteTy, Str.length()+1);
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return ConstantArray::get(ATy, ElementVals);
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}
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// destroyConstant - Remove the constant from the constant table...
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//
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void ConstantArray::destroyConstant() {
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ArrayConstants.remove(this);
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destroyConstantImpl();
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}
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//---- ConstantStruct::get() implementation...
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//
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static ValueMap<std::vector<Constant*>, ConstantStruct> StructConstants;
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ConstantStruct *ConstantStruct::get(const StructType *Ty,
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const std::vector<Constant*> &V) {
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ConstantStruct *Result = StructConstants.get(Ty, V);
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if (!Result) // If no preexisting value, create one now...
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StructConstants.add(Ty, V, Result = new ConstantStruct(Ty, V));
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return Result;
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}
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// destroyConstant - Remove the constant from the constant table...
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//
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void ConstantStruct::destroyConstant() {
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StructConstants.remove(this);
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destroyConstantImpl();
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}
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//---- ConstantPointerNull::get() implementation...
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//
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static ValueMap<char, ConstantPointerNull> NullPtrConstants;
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ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
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ConstantPointerNull *Result = NullPtrConstants.get(Ty, 0);
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if (!Result) // If no preexisting value, create one now...
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NullPtrConstants.add(Ty, 0, Result = new ConstantPointerNull(Ty));
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return Result;
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}
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//---- ConstantPointerRef::get() implementation...
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//
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ConstantPointerRef *ConstantPointerRef::get(GlobalValue *GV) {
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assert(GV->getParent() && "Global Value must be attached to a module!");
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// The Module handles the pointer reference sharing...
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return GV->getParent()->getConstantPointerRef(GV);
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}
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//---- ConstantExpr::get() implementations...
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// Return NULL on invalid expressions.
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//
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typedef pair<unsigned, vector<Constant*> > ExprMapKeyType;
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static ValueMap<const ExprMapKeyType, ConstantExpr> ExprConstants;
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ConstantExpr *ConstantExpr::get(unsigned Opcode, Constant *C, const Type *Ty) {
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// Look up the constant in the table first to ensure uniqueness
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vector<Constant*> argVec(1, C);
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const ExprMapKeyType &Key = make_pair(Opcode, argVec);
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ConstantExpr *Result = ExprConstants.get(Ty, Key);
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if (Result) return Result;
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// Its not in the table so create a new one and put it in the table.
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// Check the operands for consistency first
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assert(Opcode == Instruction::Cast ||
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(Opcode >= Instruction::FirstUnaryOp &&
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Opcode < Instruction::NumUnaryOps) &&
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"Invalid opcode in unary ConstantExpr!");
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// type of operand will not match result for Cast operation
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assert((Opcode == Instruction::Cast || Ty == C->getType()) &&
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"Type of operand in unary constant expression should match result");
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Result = new ConstantExpr(Opcode, C, Ty);
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ExprConstants.add(Ty, Key, Result);
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return Result;
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}
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ConstantExpr *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
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const Type *Ty) {
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// Look up the constant in the table first to ensure uniqueness
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vector<Constant*> argVec(1, C1); argVec.push_back(C2);
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const ExprMapKeyType &Key = make_pair(Opcode, argVec);
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ConstantExpr *Result = ExprConstants.get(Ty, Key);
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if (Result) return Result;
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// Its not in the table so create a new one and put it in the table.
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// Check the operands for consistency first
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assert((Opcode >= Instruction::FirstBinaryOp &&
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Opcode < Instruction::NumBinaryOps) &&
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"Invalid opcode in binary constant expression");
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assert(Ty == C1->getType() && Ty == C2->getType() &&
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"Operand types in binary constant expression should match result");
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Result = new ConstantExpr(Opcode, C1, C2, Ty);
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ExprConstants.add(Ty, Key, Result);
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return Result;
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}
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ConstantExpr *ConstantExpr::get(unsigned Opcode, Constant *C,
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const std::vector<Constant*> &IdxList,
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const Type *Ty) {
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// Look up the constant in the table first to ensure uniqueness
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vector<Constant*> argVec(1, C);
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argVec.insert(argVec.end(), IdxList.begin(), IdxList.end());
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const ExprMapKeyType &Key = make_pair(Opcode, argVec);
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ConstantExpr *Result = ExprConstants.get(Ty, Key);
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if (Result) return Result;
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// Its not in the table so create a new one and put it in the table.
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// Check the operands for consistency first
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// Must be a getElementPtr. Check for valid getElementPtr expression.
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//
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assert(Opcode == Instruction::GetElementPtr &&
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"Operator other than GetElementPtr used with an index list");
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assert(isa<PointerType>(Ty) &&
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"Non-pointer type for constant GelElementPtr expression");
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std::vector<Value*> ValIdxList(IdxList.begin(), IdxList.end());
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const Type *fldType = GetElementPtrInst::getIndexedType(C->getType(),
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ValIdxList, true);
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assert(fldType && "Invalid index list for constant GelElementPtr expression");
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assert(cast<PointerType>(Ty)->getElementType() == fldType &&
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"Type for constant GelElementPtr expression doesn't match field type");
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Result = new ConstantExpr(Opcode, C, IdxList, Ty);
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ExprConstants.add(Ty, Key, Result);
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return Result;
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}
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// destroyConstant - Remove the constant from the constant table...
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//
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void ConstantExpr::destroyConstant() {
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ExprConstants.remove(this);
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destroyConstantImpl();
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}
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const char *ConstantExpr::getOpcodeName(unsigned Opcode) {
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return Instruction::getOpcodeName(Opcode);
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}
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//---- ConstantPointerRef::mutateReferences() implementation...
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//
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unsigned ConstantPointerRef::mutateReferences(Value *OldV, Value *NewV) {
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assert(getValue() == OldV && "Cannot mutate old value if I'm not using it!");
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GlobalValue *NewGV = cast<GlobalValue>(NewV);
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getValue()->getParent()->mutateConstantPointerRef(getValue(), NewGV);
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Operands[0] = NewGV;
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return 1;
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}
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//---- ConstantPointerExpr::mutateReferences() implementation...
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//
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unsigned ConstantExpr::mutateReferences(Value* OldV, Value *NewV) {
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unsigned NumReplaced = 0;
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Constant *NewC = cast<Constant>(NewV);
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for (unsigned i = 0, N = getNumOperands(); i != N; ++i)
|
|
if (Operands[i] == OldV) {
|
|
++NumReplaced;
|
|
Operands[i] = NewC;
|
|
}
|
|
return NumReplaced;
|
|
}
|