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Recognition method of nested loop structure

A recognition method and nested loop technology, which can be applied to instruments, computing, electrical and digital data processing, etc., can solve problems such as low algorithm efficiency, and achieve the effect of simple implementation, improved structure, and accurate recognition results.

Inactive Publication Date: 2008-09-24
PEKING UNIV
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Problems solved by technology

[0008] Two years later, G. Ramalingam proposed an improved algorithm to the Havlak algorithm (see G. Ramalingam, Identifying loops in almost linear time, ACM Transactions on Programming Languages ​​and Systems, Vol.21, No.2, 1999), in the worst case Algorithm in approximately linear time (but slower than Havlak's algorithm in the general case)
[0009] The above methods are usually based on complex data structures, such as Interval / DSG, or UNION-FIND sets. The complex operations on these data sets make these algorithms very inefficient

Method used

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Embodiment Construction

[0054] The identification method of cycle of the present invention, its step can be expressed as:

[0055] 1. Disassemble the executable file to obtain the intermediate code of the executable file;

[0056] 2. Extract the control flow information from the above intermediate code to obtain the control flow graph, and further obtain the extended control flow graph G=(N, E, h 0 ): N is the set of nodes, E is the set of edges, h 0 is the entry node of the control flow graph;

[0057] 3. Depth-first traversal of the extended control flow graph to identify loop nodes, specifically including the following judgments for each node:

[0058] 1) Whether the node is a loop head node;

[0059] 2) Whether the node is in the loop body, if so, find its innermost loop head node;

[0060] 3) Whether the node is a re-entry, if so, find a re-entry edge.

[0061] 4. Mark the innermost loop head node of the node;

[0062] 5. Identify the corresponding control flow graph as a loop structure. ...

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Abstract

The invention pertains to the field of reverse project and program analysis, in particular to a method for recognizing a recycling structure which can disassemble executive files and then get intermediate codes of the executive files. Control flow information is extracted from the intermediate codes, thus obtaining a control flow chart; the control flow chart is deeply optimized and compiled, thus recognizing recycling nodes; the most internal recycling head node of the node is marked; the corresponding control flow chart is recognized as a recycling structure. The method can effectively judge the recycling structure and the embedded relationship between recycling structures, thus further effectively structuring the program control flow chart. The method can be used in decompiling, software testing, and etc. equipment.

Description

technical field [0001] The invention belongs to the field of reverse engineering and program analysis, and specifically relates to a method for identifying a nested loop structure, which can be used in equipment such as decompilation and software testing, and can effectively structure the program control flow graph. Background technique [0002] Decompilation is a technology to obtain high-level codes equivalent to source programs from executable files. It is one of the core technologies in the field of reverse engineering and plays an important role in different application fields. Initially, decompilation technology was mainly used to assist program transplantation, such as migrating programs from second-generation computers to third-generation computers; in the 1970s and 1980s, decompilation technology began to be used for re-engineering, including Understand, document, refactor and modify lost source code or third-party binary programs; since the mid-to-late 1990s, there...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/45
Inventor 韦韬李佳静毛剑邹维王铁磊王伟
Owner PEKING UNIV
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