September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Searching the tree
We need to take care of a procedure that would extract the correct address of the Assembly implementation of the virtual instruction from the tree prior to beginning the implementation of the virtual processor's loop.
The tree_lookup procedure requires two parameters:
- The address of the tree_root variable
- The byte opcode cast to double word
When this procedure is called, it "walks" the tree node by node (in accordance with the rule the tree was sorted by) and compares the opcode parameter to the opcode value of the instruction structure referred to by the current node. The procedure returns the address of the Assembly implementation of the operation code, or it returns a zero if no such opcode has been defined:
tree_lookup: ...
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