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/* ... return a ConstanTint for the given value. */ 00069 static Constant *get(Type *Ty,uint64_t V,bool isSigned = falsE);
所以,我认为,你无法修改现有的ConstanTint.如果要修改IR,则应尝试将指针更改为参数(更改IR本身,但不更改常量对象).
可能你想要这样的东西(请记住,我对LLVM没有经验;我几乎可以肯定的例子是不正确的).
instruction *I = /* your argument */; /* check that instruction is of needed format,e.g: */ if (I->getOpcode() == instruction::Add) { /* read the first operand of instruction */ Value *oldvalue = I->getOperand(0); /* construct new constant; here 0x1234 is used as value */ Value *newvalue = ConstanTint::get(oldValue->getType(),0x1234); /* replace operand with new value */ I->setOperand(0,newvalue); }
要“修改”一个常量,就有一个解决方案(增量和减量are illustrated):
/// AddOne - Add one to a ConstanTint. static Constant *AddOne(Constant *C) { return Constantexpr::getAdd(C,ConstanTint::get(C->getType(),1)); } /// SubOne - Subtract one from a ConstanTint. static Constant *SubOne(ConstanTint *C) { return ConstanTint::get(C->getContext(),C->getValue()-1); }
PS,Constant.h在关于创建和不删除常量http://llvm.org/docs/doxygen/html/Constant_8h_source.html的请求中有重要的评论
00035 /// Note that Constants are immutable (once created they never changE) 00036 /// and are fully shared by structural equivalence. This means that two 00037 /// structurally equivalent constants will always have the same address. 00038 /// Constants are created on demand as needed and never deleted: thus clients 00039 /// don't have to worry about the lifetime of the objects. 00040 /// @brief LLVM Constant Representation
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