0:000> !bpmd -md 00912ff0 MethodDesc = 00912ff0 Adding pending breakpoints in .NET

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0:000> !bpmd -md 00912ff0 MethodDesc = 00912ff0 Adding pending breakpoints
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Here, the bpmd command is clearly telling us that it is setting what is known as a pending (deferred) breakpoint If we resume execution, we can see that the debugger receives a notification and breaks execution on the method when called:
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0:003> g (8d8b0): CLR notification exception - code e0444143 (first chance) JITTED 03Breakpoint!AdvancedNETDebugging3BreakpointAddAndPrint(Int32, Int32) Setting breakpoint: bp 00CB0138 [AdvancedNETDebugging3BreakpointAddAndPrint(Int32, Int32)] Breakpoint 0 hit eax=00912ff0 ebx=0013f4ac ecx=01282e08 edx=0000000a esi=01282e08 edi=01282e08 eip=00cb0138 esp=0013f458 ebp=0013f490 iopl=0 nv up ei pl nz ac po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000212 00cb0138 57 push edi
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The interesting part is the notification output where we can see that the debugger received a CLR notification exception (0xe0444143) Furthermore, we can see
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that the notification occurred due to the JIT compiler compiling the AddAndPrint method, at which point a breakpoint was set using the bp command with a code address of 0x00cb0138 If we were to unassemble this address, we could quickly verify that it corresponds to the AddAndPrint method The final event that occurs is that the breakpoint is actually hit and the debugger breaks execution One final note on bpmd: If the method name that is specified is overloaded, bpmd will set a breakpoint on all overloaded methods
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In prior versions of the CLR (10 and 11), it was possible to set a breakpoint on a not yet JIT compiled method using the bp command In essence, we would find where the JIT compiler stores the address of the compiled code, set a break on write breakpoint, and resume execution until the JIT compiler finished the compilation process and stored the address At that point, the breakpoint would be hit and you could use the address placed there by the JIT compiler to set a breakpoint on it This was a rather long and arduous process and fortunately the bpmd command was introduced in CLR 20 to make life much easier when setting breakpoints
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Much like any other piece of code, NET code executes in the context of a process The JIT compiler is invoked to translate the IL contained within the assembly into machine code Anytime NET code accesses the same piece of code, the CLR first checks to see if it has already been compiled and, if so, reuses the compiled code When the process dies, all the work that the JIT compiler has already done in translating IL to machine code goes away with it The next time the assembly needs to be invoked, the JIT compiler goes back to work and translates the same piece of code again To avoid having to redo the compilation, the CLR has the capability to work with what is known as precompiled (or NGEN d) assemblies A precompiled assembly is nothing more than a native image of the corresponding assembly with all the code already translated into machine code If the CLR needs to execute a piece of code contained within an assembly that also has a native image on the machine, the JIT compilation step is skipped altogether and the machine code is simply loaded from the native image Even though this may seem like a huge performance booster, you may be wondering if some of the benefits of runtime JIT compilation are lost The answer is that, generally speaking, those benefits still remain because the step of
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creating the precompiled assembly occurs during installation time and not compile time Thus, we can still reap the benefits of running the JIT compiler on the architecture it was meant to run on The key difference is that the JIT compiler persists the output of the compilation into a native image rather than memory In light of native images, how does it relate to debugging NET code There really is not much difference debugging NET code that has native images As a matter of fact, at times, it can make it easier because you do not have to worry about whether a function has been JIT compiled There are a couple of caveats to be aware of though When a native image is loaded, you will see another module loaded into the address space of the process This module is loaded from the native image cache The native image cache is a collection of all precompiled assemblies that exist on a system and can be found in the following location:
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