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Make ConstantInt::getTrue/getFalse be llvm_shutdown safe.
llvm-svn: 34443
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@ -40,6 +40,7 @@ struct ConvertConstantType;
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/// represents both boolean and integral constants.
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/// @brief Class for constant integers.
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class ConstantInt : public Constant {
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static ConstantInt *TheTrueVal, *TheFalseVal;
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protected:
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uint64_t Val;
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protected:
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@ -73,14 +74,12 @@ public:
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/// getTrue/getFalse - Return the singleton true/false values.
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static inline ConstantInt *getTrue() {
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static ConstantInt *T = 0;
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if (T) return T;
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return T = new ConstantInt(Type::Int1Ty, 1);
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if (TheTrueVal) return TheTrueVal;
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return CreateTrueFalseVals(true);
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}
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static inline ConstantInt *getFalse() {
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static ConstantInt *F = 0;
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if (F) return F;
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return F = new ConstantInt(Type::Int1Ty, 0);
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if (TheFalseVal) return TheFalseVal;
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return CreateTrueFalseVals(false);
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}
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/// Return a ConstantInt with the specified value for the specified type. The
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@ -165,6 +164,9 @@ public:
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static bool classof(const Value *V) {
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return V->getValueType() == ConstantIntVal;
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}
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static void ResetTrueFalse() { TheTrueVal = TheFalseVal = 0; }
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private:
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static ConstantInt *CreateTrueFalseVals(bool WhichOne);
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};
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@ -800,6 +800,7 @@ public:
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//
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static ManagedStatic<ValueMap<uint64_t, IntegerType, ConstantInt> >IntConstants;
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// Get a ConstantInt from an int64_t. Note here that we canoncialize the value
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// to a uint64_t value that has been zero extended down to the size of the
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// integer type of the ConstantInt. This allows the getZExtValue method to
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@ -807,14 +808,32 @@ static ManagedStatic<ValueMap<uint64_t, IntegerType, ConstantInt> >IntConstants;
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// extended. getZExtValue is more common in LLVM than getSExtValue().
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ConstantInt *ConstantInt::get(const Type *Ty, int64_t V) {
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const IntegerType *ITy = cast<IntegerType>(Ty);
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if (Ty == Type::Int1Ty)
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if (V & 1)
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return getTrue();
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else
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return getFalse();
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return IntConstants->getOrCreate(ITy, V & ITy->getBitMask());
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}
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ConstantInt *ConstantInt::TheTrueVal = 0;
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ConstantInt *ConstantInt::TheFalseVal = 0;
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void CleanupTrueFalse(void *) {
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ConstantInt::ResetTrueFalse();
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}
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static ManagedCleanup<CleanupTrueFalse> TrueFalseCleanup;
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ConstantInt *ConstantInt::CreateTrueFalseVals(bool WhichOne) {
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assert(TheTrueVal == 0 && TheFalseVal == 0);
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TheTrueVal = get(Type::Int1Ty, 1);
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TheFalseVal = get(Type::Int1Ty, 0);
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// Ensure that llvm_shutdown nulls out TheTrueVal/TheFalseVal.
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TrueFalseCleanup.Register();
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return WhichOne ? TheTrueVal : TheFalseVal;
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}
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//---- ConstantFP::get() implementation...
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//
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namespace llvm {
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