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oftware integration and reuse is becoming one of the most relevant activities of software development nowadays. In this chapter, we discuss how F# programs can interoperate with the outside world, accessing code available in the form of DLLs and COM components.
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Libraries and binary components provide a common way to reuse software; even the simplest C program is linked to the standard C runtime to benefit from core functions such as memory management and I/O. Modern programs depend on a large number of libraries that are shipped in binary form, and only some of them are written in the same language of the program. Libraries can be linked statically during compilation into the executable or can be loaded dynamically during program execution. Dynamic linking has become significantly common to help share code (dynamic libraries can be linked by different programs and shared among them) and adapt program behavior while executing. Interoperability among binaries compiled by different compilers, even of the same language, can be a nightmare. One of the goals of the .NET initiative was to ease this issue by introducing the Common Language Runtime (CLR), which is targeted by different compilers and different languages to help interoperability among software developed in those languages. The CLR is a runtime designed to run programs compiled for the .NET platform. The binary format of these programs differs from the traditional one adopted by executables; according to the Microsoft terminology, we will use the term managed for the first class of programs and unmanaged otherwise (see Figure 17-1).
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CH APT ER 17 I NT ERO PE RAT ING WIT H C A ND CO M
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Figure 17-1. Compilation scheme for managed and unmanaged code
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A DEEPER LOOK INSIDE .NET EXECUTABLES
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Programs for the .NET platform are distributed in a form that is executed by the CLR. Binaries are expressed in an intermediate language that is compiled incrementally by the Just-In-Time (JIT) compiler during program execution. A .NET assembly, in the form of a .dll or an .exe file, contains the definition of a set of types and the definition of the method bodies, and the additional data describing the structure of the code in the intermediate language form is known as metadata. The intermediate language is used to define method bodies based on a stack-based machine, where operations are performed by loading values on a stack of operands and then invoking methods or operators. Consider the following simple F# program: open System let i = 2 Console.WriteLine("Input a number:") let v = Int32.Parse(Console.ReadLine()) Console.WriteLine(i * v) The F# compiler generates an executable that can be disassembled using the ildasm.exe tool distributed with the .NET Framework. The following screenshot shows the structure of the generated assembly. Since everything in the CLR is defined in terms of types, the F# compiler must introduce the class Hw (named after the file name Hw.fs) in the <StartupCode> namespace. In this class, there is the definition of the _main static method that is the entry point for the execution of the program. This is the method that will contain the intermediate language corresponding to the example F# program. The F# compiler generates several elements that are not defined in the program, whose goal is to preserve the semantics of the F# program in the intermediate language.
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C HA PTER 17 INTEROPERA TING WITH C AND C OM
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If you open the _main method, you ll find the following code that we have annotated with the corresponding F# statements: .method public static void _main() cil managed { .entrypoint // Code size 56 (0x38) .maxstack 4 // let i = 2;; IL_0000: ldc.i4.2 IL_0001: stsfld
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int32 '<StartupCode>'.Hw::i@3
// do Console.WriteLine("Input a number:");; IL_0006: ldstr "Input a number:" IL_000b: call void [mscorlib]System.Console::WriteLine(string) IL_0010: ldnull // let v = Int32.Parse(Console.ReadLine());; IL_0011: stsfld class [fslib]Microsoft.FSharp.Core.Unit '<StartupCode>'.Hw::_doval@6@6 IL_0016: call string [mscorlib]System.Console::ReadLine() IL_001b: call int32 [mscorlib]System.Int32::Parse(string) IL_0020: stsfld int32 '<StartupCode>'.Hw::v@8 // do Console.WriteLine(i * v);; IL_0025: ldc.i4.2 IL_0026: call int32 Hw::get_v() IL_002b: mul IL_002c: call void [mscorlib]System.Console::WriteLine(int32)
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