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High-level programming languages allow programmers to combine any number of conditions using the logical operators. This means that programmers can create complex combinations of conditional statements all combined using the logical operators.
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Appendix A
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Assembly Language Code
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High-Level Code
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cmp jne cmp jne cmp je mov
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[Variable1], 100
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if (Variable1 == 100 && Variable2 == 50 && Variable3 != 0) Result = 1; ...
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AfterConditionalBlock [Variable2], 50
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AfterConditionalBlock [Variable3], 0
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AfterConditionalBlock [Result], 1
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AfterConditionalBlock: ...
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Figure A.10 High-level/low-level view of a compound conditional statement with three conditions combined using the AND operator.
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There are quite a few different combinations that programmers could use, and I could never possibly cover every one of those combinations. Instead, let s take a quick look at one combination and try and determine the general rules for properly deciphering these kinds of statements.
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cmp je cmp jne cmp je ConditionalBlock: call AfterConditionalBlock: ... [Variable1], 100 ConditionalBlock [Variable2], 50 AfterConditionalBlock [Variable3], 0 AfterConditionalBlock SomeFunction
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This sample is identical to the previous sample of an optimized application of the OR logical operator, except that an additional condition has been added to test whether Variable3 equals zero. If it is, the conditional code block is not executed. The following C code is a high-level representation of the preceding assembly language snippet.
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if (Variable1 == 100 || (Variable2 == 50 && Variable3 != 0)) SomeFunction();
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Deciphering Code Structures
It is not easy to define truly generic rules for reading compound conditionals in assembly language, but the basic parameter to look for is the jump target address of each one of the conditional branches. Conditions combined using the OR operator will usually jump directly to the conditional code block, and their conditions will not be reversed (except for the last condition, which will point to the code that follows the conditional block and will be reversed). In contrast, conditions combined using the AND operator will tend to be reversed and jump to the code block that follows the conditional code block. When analyzing complex compound conditionals, you must simply use these basic rules to try and figure out each condition and see how the conditions are connected.
n-way Conditional (Switch Blocks)
Switch blocks (or n-way conditionals) are commonly used when different behavior is required for different values all coming from the same operand. Switch blocks essentially let programmers create tables of possible values and responses. Note that usually a single response can be used for more than one value. Compilers have several methods for dealing with switch blocks, depending on how large they are and what range of values they accept. The following sections demonstrate the two most common implementations of n-way conditionals: the table implementation and the tree implementation.
Table Implementation
The most efficient approach (from a runtime performance standpoint) for large switch blocks is to generate a pointer table. The idea is to compile each of the code blocks in the switch statement, and to record the pointers to each one of those code blocks in a table. Later, when the switch block is executed, the operand on which the switch block operates is used as an index into that pointer table, and the processor simply jumps to the correct code block. Note that this is not a function call, but rather an unconditional jump that goes through a pointer table. The pointer tables are usually placed right after the function that contains the switch block, but that s not always the case it depends on the specific compiler used. When a function table is placed in the middle of the code section, you pretty much know for a fact that it is a switch block pointer table. Hard-coded pointer tables within the code section aren t really a common sight. Figure A.11 demonstrates how an n-way conditional is implemented using a table. The first case constant in the source code is 1 and the last is 5, so there are essentially five different case blocks to be supported in the table. The default block is not implemented as part of the table because there is no specific value that triggers it any value that s not within the 1 5 range will make