-//===-- ConstantVals.cpp - Implement Constant nodes --------------*- C++ -*--=//
+//===-- Constants.cpp - Implement Constant nodes -----------------*- C++ -*--=//
//
// 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/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"
using std::map;
using std::pair;
using std::make_pair;
+using std::vector;
ConstantBool *ConstantBool::True = new ConstantBool(true);
ConstantBool *ConstantBool::False = new ConstantBool(false);
if (Name.size()) ST->insert(Name, this);
}
+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,
+ // 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: " << *this
+ << "\n\nUse still stuck around after Def is destroyed: "
+ << *V << "\n\n";
+#endif
+ 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!");
+ }
+
+ // 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::getNullConstant(const Type *Ty) {
+Constant *Constant::getNullValue(const Type *Ty) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: return ConstantBool::get(false);
case Type::SByteTyID:
}
}
-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,
- // 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";
- }
-#endif
- assert(isa<Constant>(V) && "References remain to ConstantPointerRef!");
- Constant *CPV = cast<Constant>(V);
- CPV->destroyConstant();
+// 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);
+ }
- // The constant should remove itself from our use list...
- assert((use_empty() || use_back() == V) && "Constant not removed!");
+ case Type::UByteTyID:
+ case Type::UShortTyID:
+ case Type::UIntTyID:
+ case Type::ULongTyID: return getAllOnesValue(Ty);
+
+ default: return 0;
}
+}
- // Value has no outstanding references it is safe to delete it now...
- delete this;
+// 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;
+ }
}
+
//===----------------------------------------------------------------------===//
// 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++) {
+ Operands.reserve(V.size());
+ for (unsigned i = 0, e = V.size(); i != e; ++i) {
assert(V[i]->getType() == T->getElementType());
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.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]);
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);
-}
-
-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;
+ConstantExpr::ConstantExpr(unsigned Opcode, Constant *C, const Type *Ty)
+ : Constant(Ty), iType(Opcode) {
+ Operands.push_back(Use(C, this));
}
-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(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
};
//===----------------------------------------------------------------------===//
-// Hash Function Implementations
-#if 0
-unsigned ConstantSInt::hash(const Type *Ty, int64_t V) {
- return unsigned(Ty->getPrimitiveID() ^ V);
-}
+// replaceUsesOfWithOnConstant implementations
-unsigned ConstantUInt::hash(const Type *Ty, uint64_t V) {
- return unsigned(Ty->getPrimitiveID() ^ V);
-}
+void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To) {
+ 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!");
-unsigned ConstantFP::hash(const Type *Ty, double V) {
- return Ty->getPrimitiveID() ^ unsigned(V);
+ // Everyone using this now uses the replacement...
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
}
-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;
+void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To) {
+ assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
+
+ 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...
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
+}
+
+void ConstantPointerRef::replaceUsesOfWithOnConstant(Value *From, Value *To) {
+ 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...
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
+ } else {
+ // Just replace ourselves with the To value specified.
+ replaceAllUsesWith(To);
+
+ // Delete the old constant!
+ destroyConstant();
+ }
}
-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;
+void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *To) {
+ assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
+
+ ConstantExpr *Replacement = 0;
+ if (getOpcode() == Instruction::GetElementPtr) {
+ std::vector<Constant*> Indices;
+ Constant *Pointer = cast<Constant>(getOperand(0));
+ Indices.reserve(getNumOperands()-1);
+ if (Pointer == From) Pointer = cast<Constant>(To);
+
+ for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
+ Constant *Val = cast<Constant>(getOperand(i));
+ if (Val == From) Val = cast<Constant>(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(cast<Constant>(To), getType());
+ } else if (getNumOperands() == 2) {
+ Constant *C1 = cast<Constant>(getOperand(0));
+ Constant *C2 = cast<Constant>(getOperand(1));
+ if (C1 == From) C1 = cast<Constant>(To);
+ if (C2 == From) C2 = cast<Constant>(To);
+ Replacement = ConstantExpr::get(getOpcode(), C1, C2);
+ } else {
+ assert(0 && "Unknown ConstantExpr type!");
+ return;
+ }
+
+ assert(Replacement != this && "I didn't contain From!");
+
+ // Everyone using this now uses the replacement...
+ replaceAllUsesWith(Replacement);
+
+ // Delete the old constant!
+ destroyConstant();
}
-#endif
+
+
//===----------------------------------------------------------------------===//
// Factory Function Implementation
map<ConstHashKey, ConstantClass *> Map;
inline ConstantClass *get(const Type *Ty, ValType V) {
- map<ConstHashKey,ConstantClass *>::iterator I =
+ typename map<ConstHashKey,ConstantClass *>::iterator I =
Map.find(ConstHashKey(Ty, V));
return (I != Map.end()) ? I->second : 0;
}
}
inline void remove(ConstantClass *CP) {
- for (map<ConstHashKey,ConstantClass *>::iterator I = Map.begin(),
+ for (typename map<ConstHashKey,ConstantClass *>::iterator I = Map.begin(),
E = Map.end(); I != E;++I)
if (I->second == CP) {
Map.erase(I);
destroyConstantImpl();
}
+// 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.
+//
+std::string ConstantArray::getAsString() const {
+ std::string Result;
+ if (getType()->getElementType() == Type::SByteTy)
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ Result += (char)cast<ConstantSInt>(getOperand(i))->getValue();
+ else {
+ assert(getType()->getElementType() == Type::UByteTy && "Not a string!");
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ Result += (char)cast<ConstantUInt>(getOperand(i))->getValue();
+ }
+ return Result;
+}
+
+
//---- ConstantStruct::get() implementation...
//
static ValueMap<std::vector<Constant*>, ConstantStruct> StructConstants;
destroyConstantImpl();
}
+
//---- ConstantPointerNull::get() implementation...
//
static ValueMap<char, ConstantPointerNull> NullPtrConstants;
return Result;
}
+// 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 pair<unsigned, vector<Constant*> > ExprMapKeyType;
+static ValueMap<const ExprMapKeyType, ConstantExpr> ExprConstants;
+
+ConstantExpr *ConstantExpr::getCast(Constant *C, const Type *Ty) {
-void ConstantPointerRef::mutateReference(GlobalValue *NewGV) {
- getValue()->getParent()->mutateConstantPointerRef(getValue(), NewGV);
- Operands[0] = NewGV;
+ // Look up the constant in the table first to ensure uniqueness
+ vector<Constant*> argVec(1, C);
+ const ExprMapKeyType &Key = make_pair(Instruction::Cast, argVec);
+ ConstantExpr *Result = ExprConstants.get(Ty, Key);
+ if (Result) return Result;
+
+ // Its not in the table so create a new one and put it in the table.
+ Result = new ConstantExpr(Instruction::Cast, C, Ty);
+ ExprConstants.add(Ty, Key, Result);
+ return Result;
+}
+
+ConstantExpr *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2) {
+ // Look up the constant in the table first to ensure uniqueness
+ vector<Constant*> argVec(1, C1); argVec.push_back(C2);
+ const ExprMapKeyType &Key = make_pair(Opcode, argVec);
+ ConstantExpr *Result = ExprConstants.get(C1->getType(), Key);
+ if (Result) return Result;
+
+ // Its not in the table so create a new one and put it in the table.
+ // 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");
+
+ Result = new ConstantExpr(Opcode, C1, C2);
+ ExprConstants.add(C1->getType(), Key, Result);
+ return Result;
+}
+
+ConstantExpr *ConstantExpr::getGetElementPtr(Constant *C,
+ const std::vector<Constant*> &IdxList) {
+ const Type *Ty = C->getType();
+
+ // Look up the constant in the table first to ensure uniqueness
+ vector<Constant*> argVec(1, C);
+ argVec.insert(argVec.end(), IdxList.begin(), IdxList.end());
+
+ const ExprMapKeyType &Key = make_pair(Instruction::GetElementPtr, argVec);
+ ConstantExpr *Result = ExprConstants.get(Ty, Key);
+ if (Result) return Result;
+
+ // Its not in the table so create a new one and put it in the table.
+ // Check the operands for consistency first
+ //
+ assert(isa<PointerType>(Ty) &&
+ "Non-pointer type for constant GelElementPtr expression");
+
+ // Check that the indices list is valid...
+ std::vector<Value*> ValIdxList(IdxList.begin(), IdxList.end());
+ const Type *DestTy = GetElementPtrInst::getIndexedType(Ty, ValIdxList, true);
+ assert(DestTy && "Invalid index list for constant GelElementPtr expression");
+
+ Result = new ConstantExpr(C, IdxList, PointerType::get(DestTy));
+ ExprConstants.add(Ty, Key, Result);
+ return Result;
+}
+
+// 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!");
+
+ OldGV->getParent()->mutateConstantPointerRef(OldGV, NewGV);
+ Operands[0] = 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;
+ }
}
projects / oota-llvm.git / blobdiff