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This code is compiled and built into an assembly, say Program .exe . When you run this application, the CLR loads and initializes . Then the CLR reads the assembly s CLR header, looking for the MethodDefToken that identifies the application s entry point method (Main) . From the MethodDef metadata table, the offset within the file for the method s IL code is located and JIT-compiled into native code, which includes having the code verified for type safety . The native code then starts executing . Following is the IL code for the Main method . To obtain this output, I ran ILDasm .exe, chose the View menu s Show Bytes menu item, and then double-clicked the Main method in the tree view .

an you develop software without testing Sure you can. Can you float without knowing how to swim Sure you can for about 20 seconds. Software development involves constantly striving to produce code that s as bug-free as possible. And that means testing starting at the lowest level and ending at the highest. In a modern software development company, the lowest level is usually unit testing, which you learned about in part 1. It s followed by a happy crowd of other types of testing including, but not limited to, integration, regression, and load testing, ending with end-user acceptance testing. You can accomplish this in the CI process by making the testing and analysis happen constantly. In part 2 (chapters 7 and 8), we discuss how to extend your test repertoire beyond unit testing and incorporate other types of testing into the CI process. Finally, you ll learn how to perform code analysis on the source and at the intermediate code level. After reading this part of the book, you ll be able to extend your CI process s testing, add static code analysis, and take total control over CI feedback.

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second part isn t evaluated unless the first part is true, it is never evaluated when denominator equals 0, so no divide-by-zero error occurs. On the other hand, since the && (and) is evaluated left to right, the following logically equivalent statement doesn t work:

.method public hidebysig static void Main() cil managed // SIG: 00 00 01 { .entrypoint // Method begins at RVA 0x2050 // Code size 11 (0xb) .maxstack 8 IL_0000: /* 72 | (70)000001 */ ldstr "Hi" IL_0005: /* 28 | (0A)000003 */ call void [mscorlib]System.Console::WriteLine(string) IL_000a: /* 2A | */ ret } // end of method Program::Main

When JIT-compiling this code, the CLR detects all references to types and members and loads their defining assemblies (if not already loaded) . As you can see, the IL code above has a reference to System.Console.WriteLine . Specifically, the IL call instruction references

if ( ( ( item / denominator ) > MIN_VALUE ) && ( denominator != 0 ) ) ...

metadata token 0A000003 . This token identifies entry 3 in the MemberRef metadata table (table 0A) . The CLR looks up this MemberRef entry and sees that one of its fields refers to an entry in a TypeRef table (the System.Console type) . From the TypeRef entry, the CLR is directed to an AssemblyRef entry: mscorlib, Version=4 .0 .0 .0, Culture=neutral, PublicKeyToken=b77a5c561934e089 . At this point, the CLR knows which assembly it needs . Now the CLR must locate the assembly in order to load it . When resolving a referenced type, the CLR can find the type in one of three places:

In this case, item / denominator is evaluated before denominator != 0. Consequently, this code commits the divide-by-zero error. Java further complicates this picture by providing logical operators and conditional operators. Java and C++ s && and <;$LB><;$LB> operators function similarly. Java s logical & and <;$LB> operators do not necessarily short-circuit the evaluation of the right-hand term when the left-hand term determines the truth or falsity of the expression. In other words, in Java, this is safe: