Vector Creation in Visual Basic .NET

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Vector Creation
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In order to work with a vector, it is necessary to create one. The IL instruction set contains special instructions for vector creation and vector length querying: newarr <token> (0x8D). Create a vector. <token> specifies the type of vector elements and must be a valid TypeDef, TypeRef, or TypeSpec token. This instruction pops the number of vector elements (native int or int32) from the stack and pushes an object reference to the created vector on the stack. If the operation fails, an OutOfMemory exception is thrown. If the number of elements happens to be negative, an Overflow exception is thrown. The elements of the newly created vector are zero initialized. For example: .locals init (int32[] arr) ldc.i4 123 newarr [mscorlib]System.Int32 // newarr int32 would work too stloc.0 For specific details about array creation, see the description of the newobj instruction.
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CHAPTER 13 IL INSTRUCTIONS
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ldlen (0x8E). Get the element count of a vector. This instruction takes an object reference to the vector instance from the stack and puts the element count (native int) on the stack.
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You can obtain a managed pointer to a single vector element by using the following instruction: ldelema <token> (0x8F). Get the address (a managed pointer) of a vector element. <token> specifies the type of the element and must be a valid TypeDef, TypeRef, or TypeSpec token. This instruction takes the element index (native int) and the vector reference (an object reference) from the stack and pushes the managed pointer to the element on the stack. readonly. (0xFE 0x1E). Prefix instruction, introduced in version 2.0 of the CLR, to be used with the ldelema instruction. With this prefix, ldelema yields not a managed pointer to the element but a controlled mutability managed pointer, which can be used only as a source pointer but not as a destination pointer. For example, you can use a controlled mutability pointer as an instance pointer when accessing instance fields or methods, as a source pointer in cpobj instruction, or as a pointer in an ldind or ldobj instruction. But it cannot be used in any instruction that would change the instance it points to, such as initobj, stind, stobj, or mkrefany. The main reason for introducing this prefix instruction is to avoid the type check ldelema must execute when the type specified might be a reference class. If the ldelema instruction is preceded by the readonly. prefix, the type check is suppressed, because it is known that the obtained pointer cannot be used for writing purposes (the referent type instance cannot be mutated). Of course, the type might have a method that mutates the instance, and the controlled mutability pointer can be used to call this method and thus mutate the instance. Also, you can use this pointer for the stfld instruction, and if it doesn t mutate the instance, I don t know what does. So, a controlled mutability pointer is not exactly a read-only pointer. However, you can only fiddle with this very instance (pointed at by the controlled mutability pointer); you cannot replace it with another instance, and in this sense the pointer is read-only.
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Element loading instructions load a vector element of an elementary type on the stack. All these instructions take the element index (native int) and the vector reference (an object reference) from the stack and put the value of the element on the stack. If the vector reference is null, the instructions throw a NullReference exception. If the index is negative or greater than or equal to the element count of the vector, an IndexOutOfRange exception is thrown. ldelem.i1 (0x90). Load a vector element of type int8. ldelem.u1 (0x91). Load a vector element of type unsigned int8. ldelem.i2 (0x92). Load a vector element of type int16. ldelem.u2 (0x93). Load a vector element of type unsigned int16. ldelem.i4 (0x94). Load a vector element of type int32.
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