-//===-- ConstantVals.cpp - Implement Constant nodes --------------*- C++ -*--=//
+//===-- Constants.cpp - Implement Constant nodes --------------------------===//
//
// This file implements the Constant* classes...
//
//===----------------------------------------------------------------------===//
-#define __STDC_LIMIT_MACROS // Get defs for INT64_MAX and friends...
-#include "llvm/ConstantVals.h"
+#include "llvm/Constants.h"
+#include "llvm/ConstantHandling.h"
#include "llvm/DerivedTypes.h"
+#include "llvm/iMemory.h"
#include "llvm/SymbolTable.h"
-#include "llvm/GlobalValue.h"
#include "llvm/Module.h"
-#include "llvm/SlotCalculator.h"
#include "Support/StringExtras.h"
#include <algorithm>
-using std::map;
-using std::pair;
-using std::make_pair;
-
ConstantBool *ConstantBool::True = new ConstantBool(true);
ConstantBool *ConstantBool::False = new ConstantBool(false);
if (Name.size()) ST->insert(Name, this);
}
-// Static constructor to create a '0' constant of arbitrary type...
-Constant *Constant::getNullConstant(const Type *Ty) {
- switch (Ty->getPrimitiveID()) {
- case Type::BoolTyID: return ConstantBool::get(false);
- case Type::SByteTyID:
- case Type::ShortTyID:
- case Type::IntTyID:
- case Type::LongTyID: return ConstantSInt::get(Ty, 0);
-
- case Type::UByteTyID:
- case Type::UShortTyID:
- case Type::UIntTyID:
- case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
-
- case Type::FloatTyID:
- case Type::DoubleTyID: return ConstantFP::get(Ty, 0);
-
- case Type::PointerTyID:
- return ConstantPointerNull::get(cast<PointerType>(Ty));
- default:
- return 0;
- }
-}
-
void Constant::destroyConstantImpl() {
// When a Constant is destroyed, there may be lingering
// references to the constant by other constants in the constant pool. These
- // constants are implicitly dependant on the module that is being deleted,
+ // constants are implicitly dependent on the module that is being deleted,
// but they don't know that. Because we only find out when the CPV is
// deleted, we must now notify all of our users (that should only be
// Constants) that they are, in fact, invalid now and should be deleted.
while (!use_empty()) {
Value *V = use_back();
#ifndef NDEBUG // Only in -g mode...
- if (!isa<Constant>(V)) {
- std::cerr << "While deleting: ";
- dump();
- std::cerr << "\nUse still stuck around after Def is destroyed: ";
- V->dump();
- std::cerr << "\n";
- }
+ if (!isa<Constant>(V))
+ std::cerr << "While deleting: " << *this
+ << "\n\nUse still stuck around after Def is destroyed: "
+ << *V << "\n\n";
#endif
- assert(isa<Constant>(V) && "References remain to ConstantPointerRef!");
+ assert(isa<Constant>(V) && "References remain to Constant being destroyed");
Constant *CPV = cast<Constant>(V);
CPV->destroyConstant();
// The constant should remove itself from our use list...
- assert((use_empty() || use_back() == V) && "Constant not removed!");
+ assert((use_empty() || use_back() != V) && "Constant not removed!");
}
// Value has no outstanding references it is safe to delete it now...
delete this;
}
+// Static constructor to create a '0' constant of arbitrary type...
+Constant *Constant::getNullValue(const Type *Ty) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID: {
+ static Constant *NullBool = ConstantBool::get(false);
+ return NullBool;
+ }
+ case Type::SByteTyID: {
+ static Constant *NullSByte = ConstantSInt::get(Type::SByteTy, 0);
+ return NullSByte;
+ }
+ case Type::UByteTyID: {
+ static Constant *NullUByte = ConstantUInt::get(Type::UByteTy, 0);
+ return NullUByte;
+ }
+ case Type::ShortTyID: {
+ static Constant *NullShort = ConstantSInt::get(Type::ShortTy, 0);
+ return NullShort;
+ }
+ case Type::UShortTyID: {
+ static Constant *NullUShort = ConstantUInt::get(Type::UShortTy, 0);
+ return NullUShort;
+ }
+ case Type::IntTyID: {
+ static Constant *NullInt = ConstantSInt::get(Type::IntTy, 0);
+ return NullInt;
+ }
+ case Type::UIntTyID: {
+ static Constant *NullUInt = ConstantUInt::get(Type::UIntTy, 0);
+ return NullUInt;
+ }
+ case Type::LongTyID: {
+ static Constant *NullLong = ConstantSInt::get(Type::LongTy, 0);
+ return NullLong;
+ }
+ case Type::ULongTyID: {
+ static Constant *NullULong = ConstantUInt::get(Type::ULongTy, 0);
+ return NullULong;
+ }
+
+ case Type::FloatTyID: {
+ static Constant *NullFloat = ConstantFP::get(Type::FloatTy, 0);
+ return NullFloat;
+ }
+ case Type::DoubleTyID: {
+ static Constant *NullDouble = ConstantFP::get(Type::DoubleTy, 0);
+ return NullDouble;
+ }
+
+ case Type::PointerTyID:
+ return ConstantPointerNull::get(cast<PointerType>(Ty));
+
+ case Type::StructTyID: {
+ const StructType *ST = cast<StructType>(Ty);
+ const StructType::ElementTypes &ETs = ST->getElementTypes();
+ std::vector<Constant*> Elements;
+ Elements.resize(ETs.size());
+ for (unsigned i = 0, e = ETs.size(); i != e; ++i)
+ Elements[i] = Constant::getNullValue(ETs[i]);
+ return ConstantStruct::get(ST, Elements);
+ }
+ case Type::ArrayTyID: {
+ const ArrayType *AT = cast<ArrayType>(Ty);
+ Constant *El = Constant::getNullValue(AT->getElementType());
+ unsigned NumElements = AT->getNumElements();
+ return ConstantArray::get(AT, std::vector<Constant*>(NumElements, El));
+ }
+ default:
+ // Function, Type, Label, or Opaque type?
+ assert(0 && "Cannot create a null constant of that type!");
+ return 0;
+ }
+}
+
+// Static constructor to create the maximum constant of an integral type...
+ConstantIntegral *ConstantIntegral::getMaxValue(const Type *Ty) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID: return ConstantBool::True;
+ case Type::SByteTyID:
+ case Type::ShortTyID:
+ case Type::IntTyID:
+ case Type::LongTyID: {
+ // Calculate 011111111111111...
+ unsigned TypeBits = Ty->getPrimitiveSize()*8;
+ int64_t Val = INT64_MAX; // All ones
+ Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
+ return ConstantSInt::get(Ty, Val);
+ }
+
+ case Type::UByteTyID:
+ case Type::UShortTyID:
+ case Type::UIntTyID:
+ case Type::ULongTyID: return getAllOnesValue(Ty);
+
+ default: return 0;
+ }
+}
+
+// Static constructor to create the minimum constant for an integral type...
+ConstantIntegral *ConstantIntegral::getMinValue(const Type *Ty) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID: return ConstantBool::False;
+ case Type::SByteTyID:
+ case Type::ShortTyID:
+ case Type::IntTyID:
+ case Type::LongTyID: {
+ // Calculate 1111111111000000000000
+ unsigned TypeBits = Ty->getPrimitiveSize()*8;
+ int64_t Val = -1; // All ones
+ Val <<= TypeBits-1; // Shift over to the right spot
+ return ConstantSInt::get(Ty, Val);
+ }
+
+ case Type::UByteTyID:
+ case Type::UShortTyID:
+ case Type::UIntTyID:
+ case Type::ULongTyID: return ConstantUInt::get(Ty, 0);
+
+ default: return 0;
+ }
+}
+
+// Static constructor to create an integral constant with all bits set
+ConstantIntegral *ConstantIntegral::getAllOnesValue(const Type *Ty) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID: return ConstantBool::True;
+ case Type::SByteTyID:
+ case Type::ShortTyID:
+ case Type::IntTyID:
+ case Type::LongTyID: return ConstantSInt::get(Ty, -1);
+
+ case Type::UByteTyID:
+ case Type::UShortTyID:
+ case Type::UIntTyID:
+ case Type::ULongTyID: {
+ // Calculate ~0 of the right type...
+ unsigned TypeBits = Ty->getPrimitiveSize()*8;
+ uint64_t Val = ~0ULL; // All ones
+ Val >>= 64-TypeBits; // Shift out unwanted 1 bits...
+ return ConstantUInt::get(Ty, Val);
+ }
+ default: return 0;
+ }
+}
+
+bool ConstantUInt::isAllOnesValue() const {
+ unsigned TypeBits = getType()->getPrimitiveSize()*8;
+ uint64_t Val = ~0ULL; // All ones
+ Val >>= 64-TypeBits; // Shift out inappropriate bits
+ return getValue() == Val;
+}
+
+
//===----------------------------------------------------------------------===//
// ConstantXXX Classes
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Normal Constructors
-ConstantBool::ConstantBool(bool V) : Constant(Type::BoolTy) {
+ConstantBool::ConstantBool(bool V) : ConstantIntegral(Type::BoolTy) {
Val = V;
}
-ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : Constant(Ty) {
+ConstantInt::ConstantInt(const Type *Ty, uint64_t V) : ConstantIntegral(Ty) {
Val.Unsigned = V;
}
ConstantSInt::ConstantSInt(const Type *Ty, int64_t V) : ConstantInt(Ty, V) {
+ assert(Ty->isInteger() && Ty->isSigned() &&
+ "Illegal type for unsigned integer constant!");
assert(isValueValidForType(Ty, V) && "Value too large for type!");
}
ConstantUInt::ConstantUInt(const Type *Ty, uint64_t V) : ConstantInt(Ty, V) {
+ assert(Ty->isInteger() && Ty->isUnsigned() &&
+ "Illegal type for unsigned integer constant!");
assert(isValueValidForType(Ty, V) && "Value too large for type!");
}
ConstantArray::ConstantArray(const ArrayType *T,
const std::vector<Constant*> &V) : Constant(T) {
- for (unsigned i = 0; i < V.size(); i++) {
- assert(V[i]->getType() == T->getElementType());
+ Operands.reserve(V.size());
+ for (unsigned i = 0, e = V.size(); i != e; ++i) {
+ assert(V[i]->getType() == T->getElementType() ||
+ (T->isAbstract() &&
+ V[i]->getType()->getPrimitiveID() ==
+ T->getElementType()->getPrimitiveID()));
Operands.push_back(Use(V[i], this));
}
}
ConstantStruct::ConstantStruct(const StructType *T,
const std::vector<Constant*> &V) : Constant(T) {
const StructType::ElementTypes &ETypes = T->getElementTypes();
-
- for (unsigned i = 0; i < V.size(); i++) {
- assert(V[i]->getType() == ETypes[i]);
+ assert(V.size() == ETypes.size() &&
+ "Invalid initializer vector for constant structure");
+ Operands.reserve(V.size());
+ for (unsigned i = 0, e = V.size(); i != e; ++i) {
+ assert((V[i]->getType() == ETypes[i] ||
+ (ETypes[i]->isAbstract() &&
+ ETypes[i]->getPrimitiveID()==V[i]->getType()->getPrimitiveID())) &&
+ "Initializer for struct element doesn't match struct element type!");
Operands.push_back(Use(V[i], this));
}
}
Operands.push_back(Use(GV, this));
}
-
-
-//===----------------------------------------------------------------------===//
-// getStrValue implementations
-
-std::string ConstantBool::getStrValue() const {
- return Val ? "true" : "false";
-}
-
-std::string ConstantSInt::getStrValue() const {
- return itostr(Val.Signed);
-}
-
-std::string ConstantUInt::getStrValue() const {
- return utostr(Val.Unsigned);
-}
-
-// ConstantFP::getStrValue - We would like to output the FP constant value in
-// exponential notation, but we cannot do this if doing so will lose precision.
-// Check here to make sure that we only output it in exponential format if we
-// can parse the value back and get the same value.
-//
-std::string ConstantFP::getStrValue() const {
- std::string StrVal = ftostr(Val);
-
- // Check to make sure that the stringized number is not some string like "Inf"
- // or NaN, that atof will accept, but the lexer will not. Check that the
- // string matches the "[-+]?[0-9]" regex.
- //
- if ((StrVal[0] >= '0' && StrVal[0] <= '9') ||
- ((StrVal[0] == '-' || StrVal[0] == '+') &&
- (StrVal[0] >= '0' && StrVal[0] <= '9'))) {
- double TestVal = atof(StrVal.c_str()); // Reparse stringized version!
- if (TestVal == Val)
- return StrVal;
- }
-
- // Otherwise we could not reparse it to exactly the same value, so we must
- // output the string in hexadecimal format!
- //
- // Behave nicely in the face of C TBAA rules... see:
- // http://www.nullstone.com/htmls/category/aliastyp.htm
- //
- char *Ptr = (char*)&Val;
- assert(sizeof(double) == sizeof(uint64_t) && sizeof(double) == 8 &&
- "assuming that double is 64 bits!");
- return "0x"+utohexstr(*(uint64_t*)Ptr);
+ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
+ : Constant(Ty), iType(Opcode) {
+ Operands.push_back(Use(C, this));
}
-std::string ConstantArray::getStrValue() const {
- std::string Result;
-
- // As a special case, print the array as a string if it is an array of
- // ubytes or an array of sbytes with positive values.
- //
- const Type *ETy = getType()->getElementType();
- bool isString = (ETy == Type::SByteTy || ETy == Type::UByteTy);
-
- if (ETy == Type::SByteTy) {
- for (unsigned i = 0; i < Operands.size(); ++i)
- if (ETy == Type::SByteTy &&
- cast<ConstantSInt>(Operands[i])->getValue() < 0) {
- isString = false;
- break;
- }
- }
-
- if (isString) {
- Result = "c\"";
- for (unsigned i = 0; i < Operands.size(); ++i) {
- unsigned char C = (ETy == Type::SByteTy) ?
- (unsigned char)cast<ConstantSInt>(Operands[i])->getValue() :
- (unsigned char)cast<ConstantUInt>(Operands[i])->getValue();
-
- if (isprint(C)) {
- Result += C;
- } else {
- Result += '\\';
- Result += ( C/16 < 10) ? ( C/16 +'0') : ( C/16 -10+'A');
- Result += ((C&15) < 10) ? ((C&15)+'0') : ((C&15)-10+'A');
- }
- }
- Result += "\"";
-
- } else {
- Result = "[";
- if (Operands.size()) {
- Result += " " + Operands[0]->getType()->getDescription() +
- " " + cast<Constant>(Operands[0])->getStrValue();
- for (unsigned i = 1; i < Operands.size(); i++)
- Result += ", " + Operands[i]->getType()->getDescription() +
- " " + cast<Constant>(Operands[i])->getStrValue();
- }
- Result += " ]";
- }
-
- return Result;
+static bool isSetCC(unsigned Opcode) {
+ return Opcode == Instruction::SetEQ || Opcode == Instruction::SetNE ||
+ Opcode == Instruction::SetLT || Opcode == Instruction::SetGT ||
+ Opcode == Instruction::SetLE || Opcode == Instruction::SetGE;
}
-std::string ConstantStruct::getStrValue() const {
- std::string Result = "{";
- if (Operands.size()) {
- Result += " " + Operands[0]->getType()->getDescription() +
- " " + cast<Constant>(Operands[0])->getStrValue();
- for (unsigned i = 1; i < Operands.size(); i++)
- Result += ", " + Operands[i]->getType()->getDescription() +
- " " + cast<Constant>(Operands[i])->getStrValue();
- }
-
- return Result + " }";
+ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C1, Constant *C2)
+ : Constant(isSetCC(Opcode) ? Type::BoolTy : C1->getType()), iType(Opcode) {
+ Operands.push_back(Use(C1, this));
+ Operands.push_back(Use(C2, this));
}
-std::string ConstantPointerNull::getStrValue() const {
- return "null";
+ConstantExpr::ConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
+ const Type *DestTy)
+ : Constant(DestTy), iType(Instruction::GetElementPtr) {
+ Operands.reserve(1+IdxList.size());
+ Operands.push_back(Use(C, this));
+ for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
+ Operands.push_back(Use(IdxList[i], this));
}
-std::string ConstantPointerRef::getStrValue() const {
- const GlobalValue *V = getValue();
- if (V->hasName()) return "%" + V->getName();
-
- // FIXME: This is a gross hack.
- SlotCalculator *Table = new SlotCalculator(V->getParent(), true);
- int Slot = Table->getValSlot(V);
- delete Table;
-
- if (Slot >= 0) return std::string(" %") + itostr(Slot);
- else return "<pointer reference badref>";
-}
//===----------------------------------------------------------------------===//
// classof implementations
+bool ConstantIntegral::classof(const Constant *CPV) {
+ return CPV->getType()->isIntegral() && !isa<ConstantExpr>(CPV);
+}
+
bool ConstantInt::classof(const Constant *CPV) {
- return CPV->getType()->isIntegral();
+ return CPV->getType()->isInteger() && !isa<ConstantExpr>(CPV);
}
bool ConstantSInt::classof(const Constant *CPV) {
- return CPV->getType()->isSigned();
+ return CPV->getType()->isSigned() && !isa<ConstantExpr>(CPV);
}
bool ConstantUInt::classof(const Constant *CPV) {
- return CPV->getType()->isUnsigned();
+ return CPV->getType()->isUnsigned() && !isa<ConstantExpr>(CPV);
}
bool ConstantFP::classof(const Constant *CPV) {
const Type *Ty = CPV->getType();
- return Ty == Type::FloatTy || Ty == Type::DoubleTy;
+ return ((Ty == Type::FloatTy || Ty == Type::DoubleTy) &&
+ !isa<ConstantExpr>(CPV));
}
bool ConstantArray::classof(const Constant *CPV) {
- return isa<ArrayType>(CPV->getType());
+ return isa<ArrayType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
}
bool ConstantStruct::classof(const Constant *CPV) {
- return isa<StructType>(CPV->getType());
+ return isa<StructType>(CPV->getType()) && !isa<ConstantExpr>(CPV);
}
bool ConstantPointer::classof(const Constant *CPV) {
- return isa<PointerType>(CPV->getType());
+ return (isa<PointerType>(CPV->getType()) && !isa<ConstantExpr>(CPV));
}
+
//===----------------------------------------------------------------------===//
// isValueValidForType implementations
// TODO: Figure out how to test if a double can be cast to a float!
case Type::FloatTyID:
- /*
- return (Val <= UINT8_MAX);
- */
case Type::DoubleTyID:
return true; // This is the largest type...
}
};
//===----------------------------------------------------------------------===//
-// Hash Function Implementations
-#if 0
-unsigned ConstantSInt::hash(const Type *Ty, int64_t V) {
- return unsigned(Ty->getPrimitiveID() ^ V);
+// replaceUsesOfWithOnConstant implementations
+
+void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
+ bool DisableChecking) {
+ assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
+
+ std::vector<Constant*> Values;
+ Values.reserve(getValues().size()); // Build replacement array...
+ for (unsigned i = 0, e = getValues().size(); i != e; ++i) {
+ Constant *Val = cast<Constant>(getValues()[i]);
+ if (Val == From) Val = cast<Constant>(To);
+ Values.push_back(Val);
+ }
+
+ ConstantArray *Replacement = ConstantArray::get(getType(), Values);
+ assert(Replacement != this && "I didn't contain From!");
+
+ // Everyone using this now uses the replacement...
+ if (DisableChecking)
+ uncheckedReplaceAllUsesWith(Replacement);
+ else
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
}
-unsigned ConstantUInt::hash(const Type *Ty, uint64_t V) {
- return unsigned(Ty->getPrimitiveID() ^ V);
-}
+void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
+ bool DisableChecking) {
+ assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
-unsigned ConstantFP::hash(const Type *Ty, double V) {
- return Ty->getPrimitiveID() ^ unsigned(V);
-}
+ std::vector<Constant*> Values;
+ Values.reserve(getValues().size());
+ for (unsigned i = 0, e = getValues().size(); i != e; ++i) {
+ Constant *Val = cast<Constant>(getValues()[i]);
+ if (Val == From) Val = cast<Constant>(To);
+ Values.push_back(Val);
+ }
+
+ ConstantStruct *Replacement = ConstantStruct::get(getType(), Values);
+ assert(Replacement != this && "I didn't contain From!");
+
+ // Everyone using this now uses the replacement...
+ if (DisableChecking)
+ uncheckedReplaceAllUsesWith(Replacement);
+ else
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
+}
+
+void ConstantPointerRef::replaceUsesOfWithOnConstant(Value *From, Value *To,
+ bool DisableChecking) {
+ if (isa<GlobalValue>(To)) {
+ assert(From == getOperand(0) && "Doesn't contain from!");
+ ConstantPointerRef *Replacement =
+ ConstantPointerRef::get(cast<GlobalValue>(To));
+
+ // Everyone using this now uses the replacement...
+ if (DisableChecking)
+ uncheckedReplaceAllUsesWith(Replacement);
+ else
+ replaceAllUsesWith(Replacement);
+
+ } else {
+ // Just replace ourselves with the To value specified.
+ if (DisableChecking)
+ uncheckedReplaceAllUsesWith(To);
+ else
+ replaceAllUsesWith(To);
+ }
-unsigned ConstantArray::hash(const ArrayType *Ty,
- const std::vector<Constant*> &V) {
- unsigned Result = (Ty->getUniqueID() << 5) ^ (Ty->getUniqueID() * 7);
- for (unsigned i = 0; i < V.size(); ++i)
- Result ^= V[i]->getHash() << (i & 7);
- return Result;
-}
+ // Delete the old constant!
+ destroyConstant();
+}
+
+void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
+ bool DisableChecking) {
+ assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
+ Constant *To = cast<Constant>(ToV);
+
+ Constant *Replacement = 0;
+ if (getOpcode() == Instruction::GetElementPtr) {
+ std::vector<Constant*> Indices;
+ Constant *Pointer = getOperand(0);
+ Indices.reserve(getNumOperands()-1);
+ if (Pointer == From) Pointer = To;
+
+ for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
+ Constant *Val = getOperand(i);
+ if (Val == From) Val = To;
+ Indices.push_back(Val);
+ }
+ Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices);
+ } else if (getOpcode() == Instruction::Cast) {
+ assert(getOperand(0) == From && "Cast only has one use!");
+ Replacement = ConstantExpr::getCast(To, getType());
+ } else if (getNumOperands() == 2) {
+ Constant *C1 = getOperand(0);
+ Constant *C2 = getOperand(1);
+ if (C1 == From) C1 = To;
+ if (C2 == From) C2 = To;
+ Replacement = ConstantExpr::get(getOpcode(), C1, C2);
+ } else {
+ assert(0 && "Unknown ConstantExpr type!");
+ return;
+ }
+
+ assert(Replacement != this && "I didn't contain From!");
-unsigned ConstantStruct::hash(const StructType *Ty,
- const std::vector<Constant*> &V) {
- unsigned Result = (Ty->getUniqueID() << 5) ^ (Ty->getUniqueID() * 7);
- for (unsigned i = 0; i < V.size(); ++i)
- Result ^= V[i]->getHash() << (i & 7);
- return Result;
+ // Everyone using this now uses the replacement...
+ if (DisableChecking)
+ uncheckedReplaceAllUsesWith(Replacement);
+ else
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
}
-#endif
//===----------------------------------------------------------------------===//
// Factory Function Implementation
-template<class ValType, class ConstantClass>
-struct ValueMap {
- typedef pair<const Type*, ValType> ConstHashKey;
- map<ConstHashKey, ConstantClass *> Map;
-
- inline ConstantClass *get(const Type *Ty, ValType V) {
- map<ConstHashKey,ConstantClass *>::iterator I =
- Map.find(ConstHashKey(Ty, V));
- return (I != Map.end()) ? I->second : 0;
+// ConstantCreator - A class that is used to create constants by
+// ValueMap*. This class should be partially specialized if there is
+// something strange that needs to be done to interface to the ctor for the
+// constant.
+//
+template<class ConstantClass, class TypeClass, class ValType>
+struct ConstantCreator {
+ static ConstantClass *create(const TypeClass *Ty, const ValType &V) {
+ return new ConstantClass(Ty, V);
}
+};
- inline void add(const Type *Ty, ValType V, ConstantClass *CP) {
- Map.insert(make_pair(ConstHashKey(Ty, V), CP));
+template<class ConstantClass, class TypeClass>
+struct ConvertConstantType {
+ static void convert(ConstantClass *OldC, const TypeClass *NewTy) {
+ assert(0 && "This type cannot be converted!\n");
+ abort();
}
+};
- inline void remove(ConstantClass *CP) {
- for (map<ConstHashKey,ConstantClass *>::iterator I = Map.begin(),
- E = Map.end(); I != E;++I)
- if (I->second == CP) {
- Map.erase(I);
- return;
+namespace {
+ template<class ValType, class TypeClass, class ConstantClass>
+ class ValueMap : public AbstractTypeUser {
+ typedef std::pair<const TypeClass*, ValType> MapKey;
+ typedef std::map<MapKey, ConstantClass *> MapTy;
+ typedef typename MapTy::iterator MapIterator;
+ MapTy Map;
+
+ typedef std::map<const TypeClass*, MapIterator> AbstractTypeMapTy;
+ AbstractTypeMapTy AbstractTypeMap;
+ public:
+ // getOrCreate - Return the specified constant from the map, creating it if
+ // necessary.
+ ConstantClass *getOrCreate(const TypeClass *Ty, const ValType &V) {
+ MapKey Lookup(Ty, V);
+ MapIterator I = Map.lower_bound(Lookup);
+ if (I != Map.end() && I->first == Lookup)
+ return I->second; // Is it in the map?
+
+ // If no preexisting value, create one now...
+ ConstantClass *Result =
+ ConstantCreator<ConstantClass,TypeClass,ValType>::create(Ty, V);
+
+
+ /// FIXME: why does this assert fail when loading 176.gcc?
+ //assert(Result->getType() == Ty && "Type specified is not correct!");
+ I = Map.insert(I, std::make_pair(MapKey(Ty, V), Result));
+
+ // If the type of the constant is abstract, make sure that an entry exists
+ // for it in the AbstractTypeMap.
+ if (Ty->isAbstract()) {
+ typename AbstractTypeMapTy::iterator TI =
+ AbstractTypeMap.lower_bound(Ty);
+
+ if (TI == AbstractTypeMap.end() || TI->first != Ty) {
+ // Add ourselves to the ATU list of the type.
+ cast<DerivedType>(Ty)->addAbstractTypeUser(this);
+
+ AbstractTypeMap.insert(TI, std::make_pair(Ty, I));
+ }
}
- }
-};
+ return Result;
+ }
+
+ void remove(ConstantClass *CP) {
+ // FIXME: This should not use a linear scan. If this gets to be a
+ // performance problem, someone should look at this.
+ MapIterator I = Map.begin();
+ for (MapIterator E = Map.end(); I != E && I->second != CP; ++I)
+ /* empty */;
+
+ assert(I != Map.end() && "Constant not found in constant table!");
+
+ // Now that we found the entry, make sure this isn't the entry that
+ // the AbstractTypeMap points to.
+ const TypeClass *Ty = I->first.first;
+ if (Ty->isAbstract()) {
+ assert(AbstractTypeMap.count(Ty) &&
+ "Abstract type not in AbstractTypeMap?");
+ MapIterator &ATMEntryIt = AbstractTypeMap[Ty];
+ if (ATMEntryIt == I) {
+ // Yes, we are removing the representative entry for this type.
+ // See if there are any other entries of the same type.
+ MapIterator TmpIt = ATMEntryIt;
+
+ // First check the entry before this one...
+ if (TmpIt != Map.begin()) {
+ --TmpIt;
+ if (TmpIt->first.first != Ty) // Not the same type, move back...
+ ++TmpIt;
+ }
+
+ // If we didn't find the same type, try to move forward...
+ if (TmpIt == ATMEntryIt) {
+ ++TmpIt;
+ if (TmpIt == Map.end() || TmpIt->first.first != Ty)
+ --TmpIt; // No entry afterwards with the same type
+ }
+
+ // If there is another entry in the map of the same abstract type,
+ // update the AbstractTypeMap entry now.
+ if (TmpIt != ATMEntryIt) {
+ ATMEntryIt = TmpIt;
+ } else {
+ // Otherwise, we are removing the last instance of this type
+ // from the table. Remove from the ATM, and from user list.
+ cast<DerivedType>(Ty)->removeAbstractTypeUser(this);
+ AbstractTypeMap.erase(Ty);
+ }
+ }
+ }
+
+ Map.erase(I);
+ }
+
+ void refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
+ typename AbstractTypeMapTy::iterator I =
+ AbstractTypeMap.find(cast<TypeClass>(OldTy));
+
+ assert(I != AbstractTypeMap.end() &&
+ "Abstract type not in AbstractTypeMap?");
+
+ // Convert a constant at a time until the last one is gone. The last one
+ // leaving will remove() itself, causing the AbstractTypeMapEntry to be
+ // eliminated eventually.
+ do {
+ ConvertConstantType<ConstantClass,
+ TypeClass>::convert(I->second->second,
+ cast<TypeClass>(NewTy));
+
+ I = AbstractTypeMap.find(cast<TypeClass>(OldTy));
+ } while (I != AbstractTypeMap.end());
+ }
+
+ // If the type became concrete without being refined to any other existing
+ // type, we just remove ourselves from the ATU list.
+ void typeBecameConcrete(const DerivedType *AbsTy) {
+ AbsTy->removeAbstractTypeUser(this);
+ }
+
+ void dump() const {
+ std::cerr << "Constant.cpp: ValueMap\n";
+ }
+ };
+}
+
+
//---- ConstantUInt::get() and ConstantSInt::get() implementations...
//
-static ValueMap<uint64_t, ConstantInt> IntConstants;
+static ValueMap< int64_t, Type, ConstantSInt> SIntConstants;
+static ValueMap<uint64_t, Type, ConstantUInt> UIntConstants;
ConstantSInt *ConstantSInt::get(const Type *Ty, int64_t V) {
- ConstantSInt *Result = (ConstantSInt*)IntConstants.get(Ty, (uint64_t)V);
- if (!Result) // If no preexisting value, create one now...
- IntConstants.add(Ty, V, Result = new ConstantSInt(Ty, V));
- return Result;
+ return SIntConstants.getOrCreate(Ty, V);
}
ConstantUInt *ConstantUInt::get(const Type *Ty, uint64_t V) {
- ConstantUInt *Result = (ConstantUInt*)IntConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- IntConstants.add(Ty, V, Result = new ConstantUInt(Ty, V));
- return Result;
+ return UIntConstants.getOrCreate(Ty, V);
}
ConstantInt *ConstantInt::get(const Type *Ty, unsigned char V) {
//---- ConstantFP::get() implementation...
//
-static ValueMap<double, ConstantFP> FPConstants;
+static ValueMap<double, Type, ConstantFP> FPConstants;
ConstantFP *ConstantFP::get(const Type *Ty, double V) {
- ConstantFP *Result = FPConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- FPConstants.add(Ty, V, Result = new ConstantFP(Ty, V));
- return Result;
+ return FPConstants.getOrCreate(Ty, V);
}
//---- ConstantArray::get() implementation...
//
-static ValueMap<std::vector<Constant*>, ConstantArray> ArrayConstants;
+
+template<>
+struct ConvertConstantType<ConstantArray, ArrayType> {
+ static void convert(ConstantArray *OldC, const ArrayType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ Constant *New = ConstantArray::get(NewTy, C);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+
+static ValueMap<std::vector<Constant*>, ArrayType,
+ ConstantArray> ArrayConstants;
ConstantArray *ConstantArray::get(const ArrayType *Ty,
const std::vector<Constant*> &V) {
- ConstantArray *Result = ArrayConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- ArrayConstants.add(Ty, V, Result = new ConstantArray(Ty, V));
- return Result;
+ return ArrayConstants.getOrCreate(Ty, V);
+}
+
+// destroyConstant - Remove the constant from the constant table...
+//
+void ConstantArray::destroyConstant() {
+ ArrayConstants.remove(this);
+ destroyConstantImpl();
}
// ConstantArray::get(const string&) - Return an array that is initialized to
return ConstantArray::get(ATy, ElementVals);
}
-
-// destroyConstant - Remove the constant from the constant table...
+// getAsString - If the sub-element type of this array is either sbyte or ubyte,
+// then this method converts the array to an std::string and returns it.
+// Otherwise, it asserts out.
//
-void ConstantArray::destroyConstant() {
- ArrayConstants.remove(this);
- destroyConstantImpl();
+std::string ConstantArray::getAsString() const {
+ assert((getType()->getElementType() == Type::UByteTy ||
+ getType()->getElementType() == Type::SByteTy) && "Not a string!");
+
+ std::string Result;
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ Result += (char)cast<ConstantInt>(getOperand(i))->getRawValue();
+ return Result;
}
+
//---- ConstantStruct::get() implementation...
//
-static ValueMap<std::vector<Constant*>, ConstantStruct> StructConstants;
+
+template<>
+struct ConvertConstantType<ConstantStruct, StructType> {
+ static void convert(ConstantStruct *OldC, const StructType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 0, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ Constant *New = ConstantStruct::get(NewTy, C);
+ assert(New != OldC && "Didn't replace constant??");
+
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+static ValueMap<std::vector<Constant*>, StructType,
+ ConstantStruct> StructConstants;
ConstantStruct *ConstantStruct::get(const StructType *Ty,
const std::vector<Constant*> &V) {
- ConstantStruct *Result = StructConstants.get(Ty, V);
- if (!Result) // If no preexisting value, create one now...
- StructConstants.add(Ty, V, Result = new ConstantStruct(Ty, V));
- return Result;
+ return StructConstants.getOrCreate(Ty, V);
}
// destroyConstant - Remove the constant from the constant table...
//---- ConstantPointerNull::get() implementation...
//
-static ValueMap<char, ConstantPointerNull> NullPtrConstants;
+
+// ConstantPointerNull does not take extra "value" argument...
+template<class ValType>
+struct ConstantCreator<ConstantPointerNull, PointerType, ValType> {
+ static ConstantPointerNull *create(const PointerType *Ty, const ValType &V){
+ return new ConstantPointerNull(Ty);
+ }
+};
+
+template<>
+struct ConvertConstantType<ConstantPointerNull, PointerType> {
+ static void convert(ConstantPointerNull *OldC, const PointerType *NewTy) {
+ // Make everyone now use a constant of the new type...
+ Constant *New = ConstantPointerNull::get(NewTy);
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
+static ValueMap<char, PointerType, ConstantPointerNull> NullPtrConstants;
ConstantPointerNull *ConstantPointerNull::get(const PointerType *Ty) {
- ConstantPointerNull *Result = NullPtrConstants.get(Ty, 0);
- if (!Result) // If no preexisting value, create one now...
- NullPtrConstants.add(Ty, 0, Result = new ConstantPointerNull(Ty));
- return Result;
+ return NullPtrConstants.getOrCreate(Ty, 0);
+}
+
+// destroyConstant - Remove the constant from the constant table...
+//
+void ConstantPointerNull::destroyConstant() {
+ NullPtrConstants.remove(this);
+ destroyConstantImpl();
}
+
//---- ConstantPointerRef::get() implementation...
//
ConstantPointerRef *ConstantPointerRef::get(GlobalValue *GV) {
assert(GV->getParent() && "Global Value must be attached to a module!");
-
+
// The Module handles the pointer reference sharing...
return GV->getParent()->getConstantPointerRef(GV);
}
+// destroyConstant - Remove the constant from the constant table...
+//
+void ConstantPointerRef::destroyConstant() {
+ getValue()->getParent()->destroyConstantPointerRef(this);
+ destroyConstantImpl();
+}
+
+
+//---- ConstantExpr::get() implementations...
+//
+typedef std::pair<unsigned, std::vector<Constant*> > ExprMapKeyType;
+
+template<>
+struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
+ static ConstantExpr *create(const Type *Ty, const ExprMapKeyType &V) {
+ if (V.first == Instruction::Cast)
+ return new ConstantExpr(Instruction::Cast, V.second[0], Ty);
+ if ((V.first >= Instruction::BinaryOpsBegin &&
+ V.first < Instruction::BinaryOpsEnd) ||
+ V.first == Instruction::Shl || V.first == Instruction::Shr)
+ return new ConstantExpr(V.first, V.second[0], V.second[1]);
+
+ assert(V.first == Instruction::GetElementPtr && "Invalid ConstantExpr!");
+
+ std::vector<Constant*> IdxList(V.second.begin()+1, V.second.end());
+ return new ConstantExpr(V.second[0], IdxList, Ty);
+ }
+};
+
+template<>
+struct ConvertConstantType<ConstantExpr, Type> {
+ static void convert(ConstantExpr *OldC, const Type *NewTy) {
+ Constant *New;
+ switch (OldC->getOpcode()) {
+ case Instruction::Cast:
+ New = ConstantExpr::getCast(OldC->getOperand(0), NewTy);
+ break;
+ case Instruction::Shl:
+ case Instruction::Shr:
+ New = ConstantExpr::getShiftTy(NewTy, OldC->getOpcode(),
+ OldC->getOperand(0), OldC->getOperand(1));
+ break;
+ default:
+ assert(OldC->getOpcode() >= Instruction::BinaryOpsBegin &&
+ OldC->getOpcode() < Instruction::BinaryOpsEnd);
+ New = ConstantExpr::getTy(NewTy, OldC->getOpcode(), OldC->getOperand(0),
+ OldC->getOperand(1));
+ break;
+ case Instruction::GetElementPtr:
+ // Make everyone now use a constant of the new type...
+ std::vector<Constant*> C;
+ for (unsigned i = 1, e = OldC->getNumOperands(); i != e; ++i)
+ C.push_back(cast<Constant>(OldC->getOperand(i)));
+ New = ConstantExpr::getGetElementPtrTy(NewTy, OldC->getOperand(0), C);
+ break;
+ }
+
+ assert(New != OldC && "Didn't replace constant??");
+ OldC->uncheckedReplaceAllUsesWith(New);
+ OldC->destroyConstant(); // This constant is now dead, destroy it.
+ }
+};
+
-void ConstantPointerRef::mutateReference(GlobalValue *NewGV) {
- getValue()->getParent()->mutateConstantPointerRef(getValue(), NewGV);
- Operands[0] = NewGV;
+static ValueMap<ExprMapKeyType, Type, ConstantExpr> ExprConstants;
+
+Constant *ConstantExpr::getCast(Constant *C, const Type *Ty) {
+ assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
+
+ if (Constant *FC = ConstantFoldCastInstruction(C, Ty))
+ return FC; // Fold a few common cases...
+
+ // Look up the constant in the table first to ensure uniqueness
+ std::vector<Constant*> argVec(1, C);
+ ExprMapKeyType Key = std::make_pair(Instruction::Cast, argVec);
+ return ExprConstants.getOrCreate(Ty, Key);
+}
+
+Constant *ConstantExpr::getTy(const Type *ReqTy, unsigned Opcode,
+ Constant *C1, Constant *C2) {
+ // Check the operands for consistency first
+ assert((Opcode >= Instruction::BinaryOpsBegin &&
+ Opcode < Instruction::BinaryOpsEnd) &&
+ "Invalid opcode in binary constant expression");
+ assert(C1->getType() == C2->getType() &&
+ "Operand types in binary constant expression should match");
+
+ if (ReqTy == C1->getType())
+ if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
+ return FC; // Fold a few common cases...
+
+ std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
+ ExprMapKeyType Key = std::make_pair(Opcode, argVec);
+ return ExprConstants.getOrCreate(ReqTy, Key);
+}
+
+/// getShift - Return a shift left or shift right constant expr
+Constant *ConstantExpr::getShiftTy(const Type *ReqTy, unsigned Opcode,
+ Constant *C1, Constant *C2) {
+ // Check the operands for consistency first
+ assert((Opcode == Instruction::Shl ||
+ Opcode == Instruction::Shr) &&
+ "Invalid opcode in binary constant expression");
+ assert(C1->getType()->isIntegral() && C2->getType() == Type::UByteTy &&
+ "Invalid operand types for Shift constant expr!");
+
+ if (Constant *FC = ConstantFoldShiftInstruction(Opcode, C1, C2))
+ return FC; // Fold a few common cases...
+
+ // Look up the constant in the table first to ensure uniqueness
+ std::vector<Constant*> argVec(1, C1); argVec.push_back(C2);
+ ExprMapKeyType Key = std::make_pair(Opcode, argVec);
+ return ExprConstants.getOrCreate(ReqTy, Key);
+}
+
+
+Constant *ConstantExpr::getGetElementPtrTy(const Type *ReqTy, Constant *C,
+ const std::vector<Constant*> &IdxList) {
+ if (Constant *FC = ConstantFoldGetElementPtr(C, IdxList))
+ return FC; // Fold a few common cases...
+ assert(isa<PointerType>(C->getType()) &&
+ "Non-pointer type for constant GetElementPtr expression");
+
+ // Look up the constant in the table first to ensure uniqueness
+ std::vector<Constant*> argVec(1, C);
+ argVec.insert(argVec.end(), IdxList.begin(), IdxList.end());
+ const ExprMapKeyType &Key = std::make_pair(Instruction::GetElementPtr,argVec);
+ return ExprConstants.getOrCreate(ReqTy, Key);
+}
+
+Constant *ConstantExpr::getGetElementPtr(Constant *C,
+ const std::vector<Constant*> &IdxList){
+ // Get the result type of the getelementptr!
+ std::vector<Value*> VIdxList(IdxList.begin(), IdxList.end());
+
+ const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), VIdxList,
+ true);
+ assert(Ty && "GEP indices invalid!");
+ return getGetElementPtrTy(PointerType::get(Ty), C, IdxList);
+}
+
+
+// destroyConstant - Remove the constant from the constant table...
+//
+void ConstantExpr::destroyConstant() {
+ ExprConstants.remove(this);
+ destroyConstantImpl();
+}
+
+const char *ConstantExpr::getOpcodeName() const {
+ return Instruction::getOpcodeName(getOpcode());
+}
+
+unsigned Constant::mutateReferences(Value *OldV, Value *NewV) {
+ // Uses of constant pointer refs are global values, not constants!
+ if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(this)) {
+ GlobalValue *NewGV = cast<GlobalValue>(NewV);
+ GlobalValue *OldGV = CPR->getValue();
+
+ assert(OldGV == OldV && "Cannot mutate old value if I'm not using it!");
+ Operands[0] = NewGV;
+ OldGV->getParent()->mutateConstantPointerRef(OldGV, NewGV);
+ return 1;
+ } else {
+ Constant *NewC = cast<Constant>(NewV);
+ unsigned NumReplaced = 0;
+ for (unsigned i = 0, N = getNumOperands(); i != N; ++i)
+ if (Operands[i] == OldV) {
+ ++NumReplaced;
+ Operands[i] = NewC;
+ }
+ return NumReplaced;
+ }
}