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the program jump to the default block. To efficiently implement the table lookup, the compiler subtracts 1 from ByteValue and compares it to 4. If ByteValue is above 4, the compiler unconditionally jumps to the default case. Otherwise, the compiler proceeds directly to the unconditional JMP that calls the specific conditional block. This JMP is the unique thing about tablebased n-way conditionals, and it really makes it easy to identify them while reversing. Instead of using an immediate, hard-coded address like pretty much every other unconditional jump you ll run into, this type of JMP uses a dynamically calculated memory address (usually bracketed in the disassembly) to obtain the target address (this is essentially the table lookup operation). When you look at the code for each conditional block, notice how each of the conditional cases ends with an unconditional JMP that jumps back to the code that follows the switch block. One exception is case #3, which doesn t terminate with a break instruction. This means that when this case is executed, execution will flow directly into case 4. This works smoothly in the table implementation because the compiler places the individual cases sequentially into memory. The code for case number 4 is always positioned right after case 3, so the compiler simply avoids the unconditional JMP.

java data matrix barcode reader

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When conditions aren t right for applying the table implementation for switch blocks, the compiler implements a binary tree search strategy to reach the desired item as quickly as possible. Binary tree searches are a common concept in computer science.

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Usually when you encounter a switch block that is entirely implemented as a single jump table, you can safely assume that there were only very small numeric gaps, if any, between the individual case constants in the source code. If there had been many large numeric gaps, a table implementation would be very wasteful, because the table would have to be very large and would contain large unused regions within it. However, it is sometimes possible for compilers to create more than one table for a single switch block and to have each table contain the addresses for one group of closely valued constants. This can be reasonably efficient assuming that there aren t too many large gaps between the individual constants.

movzx eax, BYTE PTR [ByteValue] add eax, -1 cmp ecx, 4 ja DefaultCase_Code jmp DWORD PTR [PointerTableAddr + ecx * 4] AfterSwitchBlock: ...

E[X3 ] = u3 E[(x )3 ] = (u )3

Pointer Table (PointerTableAddr)

u, k,

Switch (ByteValue) { case 1: Case Specific break; case 2: Case Specific break; case 3: Case Specific case 4: Case Specific break; case 5: Case Specific break; default: Case Specific break; };

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