Addressing Arguments and Local Variables in Visual Basic .NET

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Addressing Arguments and Local Variables
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A special group of IL instructions is dedicated to loading the values of method arguments and local variables on the evaluation stack and storing the values taken from the stack in local variables and method arguments. It is to be noted that in the case of vararg methods, the argument-addressing instructions described in the following sections cannot target the arguments of the variable part of the signature.
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CHAPTER 13 IL INSTRUCTIONS
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The following instructions are used for loading method argument values on the evaluation stack: ldarg <unsigned int16> (0xFE 0x09). Load the argument number <unsigned int16> on the stack. The argument enumeration is zero based, but it s important to remember that instance methods have an invisible argument not specified in the method signature: the class instance pointer, this, which is always argument number 0. The static methods don t have such an invisible argument, so for them the argument number 0 is the first argument specified in the method signature. The total number of arguments cannot exceed 65535 (0xFFFF), which means the argument ordinal cannot exceed 65534. This limitation stems from the fact that the Sequence entry of the Parameter metadata table is only 2 bytes wide. ldarg.s <unsigned int8> (0x0E). The short-parameter form of ldarg. ldarg.0 (0x02). Load argument number 0 on the stack. ldarg.1 (0x03). Load argument number 1 on the stack. ldarg.2 (0x04). Load argument number 2 on the stack. ldarg.3 (0x05). Load argument number 3 on the stack.
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These two instructions are used for loading method argument addresses on the evaluation stack: ldarga <unsigned int16> (0xFE 0x0A). Load the address of argument number <unsigned int16> on the stack. ldarga.s <unsigned int8> (0x0F). The short-parameter form of ldarga.
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Method Argument Storing
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These two instructions are used for storing a value from the stack in a method argument slot: starg <unsigned int16> (0xFE 0x0B). Take a value from the stack and store it in argument slot number <unsigned int16>. The value on the stack must be of the same type as the argument slot or must be convertible to the type of the argument slot. The convertibility rules and effects are the same as those for conversion operations, discussed earlier in this chapter. starg.s <unsigned int8> (0x10). The short-parameter form of starg.
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CHAPTER 13 IL INSTRUCTIONS
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Method Argument List
The following instruction is used exclusively in vararg methods to retrieve the method argument list and put an instance of the value type [mscorlib]System.RuntimeArgumentHandle on the stack. 10 discusses the application of this instruction. arglist (0xFE 0x00). Get the argument list handle.
Local Variable Loading
Local variable loading instructions are similar to argument loading instructions except that no invisible items appear among the local variables, so local variable number 0 is always the first one specified in the local variable signature. ldloc <unsigned int16> (0xFE 0x0C). Load the value of local variable number <unsigned int16> on the stack. Like the argument numbers, local variable numbers can range from 0 to 65534 (0xFFFE). The value 65535, also admissible for unsigned 2-byte integers, is excluded because otherwise the counter of local variables would have to be 4 bytes wide. Limiting the number of the local variables, however standardized, seems arbitrary and implementation specific, because the number of the local variables of a method is not stored in the metadata or in the method header, so this limitation comes purely from one particular implementation of the JIT compiler. ldloc.s <unsigned int8> (0x11). The short-parameter form of ldloc. ldloc.0 (0x06). Load the value of local variable number 0 on the stack. ldloc.1 (0x07). Load the value of local variable number 1 on the stack. ldloc.2 (0x08). Load the value of local variable number 2 on the stack. ldloc.3 (0x09). Load the value of local variable number 3 on the stack.
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