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Welcome to the Decompilation MCQs Page

Dive deep into the fascinating world of Decompilation with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Decompilation, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Decompilation, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

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Check out the MCQs below to embark on an enriching journey through Decompilation. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Decompilation. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Decompilation MCQs | Page 4 of 11

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Q31.
What are expression trees?

a.

Trees used to represent the control flow of a program.

b.

Trees used to represent the syntax of a program.

c.

Trees used to represent complex expressions in a structured way.

d.

None of the above

Discuss
Answer: (c).Trees used to represent complex expressions in a structured way. Explanation:Expression trees are trees used to represent complex expressions in a structured way.
Q32.
How can high-level language expressions be produced from an expression tree?

a.

By breaking down the tree into individual assembly language instructions.

b.

By scanning the tree and constructing the corresponding high-level language expression.

c.

By performing data-flow analysis on the tree.

d.

None of the above

Discuss
Answer: (b).By scanning the tree and constructing the corresponding high-level language expression. Explanation:High-level language expressions can be produced from an expression tree by scanning the tree and constructing the corresponding high-level language expression.
Q33.
What is data-flow analysis?

a.

The process of breaking down an expression tree into individual assembly language instructions.

b.

The process of reconstructing meaningful expressions from individual assembly language instructions.

c.

The process of analyzing the flow of data through a program.

d.

None of the above

Discuss
Answer: (c).The process of analyzing the flow of data through a program. Explanation:Data-flow analysis is the process of analyzing the flow of data through a program.
Q34.
What is a control flow graph and why is it important for decompilers?

a.

A graph that represents the internal flow of a single procedure

b.

A graph that represents the external flow of a single procedure

c.

A graph that represents the entire program’s flow

d.

A graph that represents the memory flow of a single procedure

Discuss
Answer: (a).A graph that represents the internal flow of a single procedure Explanation:Control flow graphs represent the internal flow of a single procedure and are important for decompilers because they can easily be converted to high-level language control flow constructs such as loops and various types of branches.
Q35.
What is the opposite function of compiler back ends performed by decompiler front ends?

a.

Converting a program’s intermediate representation to the target machine’s native assembly language

b.

Converting the target machine’s native assembly language to a program’s intermediate representation

c.

Converting high-level language code to assembly language

d.

Converting assembly language to high-level language code

Discuss
Answer: (b).Converting the target machine’s native assembly language to a program’s intermediate representation Explanation:Decompiler front ends perform the opposite function of compiler back ends, which take a compiler’s intermediate representation and convert it to the target machine’s native assembly language. Decompiler front ends take the same native assembly language and convert it back into the decompiler’s intermediate representation.
Q36.
What is the first step in the decompilation process performed by decompiler front ends?

a.

Analyzing each instruction in the source executable

b.

Converting the source executable to the decompiler’s intermediate representation

c.

Improving the decompiler’s intermediate representation during the code analysis stage

d.

Converting the decompiler’s intermediate representation to high-level language code

Discuss
Answer: (a).Analyzing each instruction in the source executable Explanation:The first step in the decompilation process performed by decompiler front ends is to go over the source executable byte by byte and analyze each instruction, including its operands.
Q37.
How do some decompilers differ from others in terms of the disassembling process?

a.

They use a different type of disassembler than IDA Pro

b.

They don’t require the user to run the source executable through a disassembler

c.

They require the user to manually disassemble the source executable

d.

They skip the disassembling process altogether and directly analyze the source executable

Discuss
Answer: (b).They don’t require the user to run the source executable through a disassembler Explanation:Some decompilers don’t actually go through the process of disassembling the source executable but instead require the user to run it through a disassembler (such as IDA Pro). The disassembler produces a textual representation of the source program which can then be read and analyzed by the decompiler.
Q38.
What is the purpose of the code analysis stage in the decompilation process?

a.

To convert the decompiler’s intermediate representation to high-level language code

b.

To analyze each instruction in the source executable and convert it to the decompiler’s intermediate representation

c.

To create a control flow graph for each procedure being analyzed

d.

To improve the decompiler’s intermediate representation in preparation for conversion to high-level language code by the back end

Discuss
Answer: (d).To improve the decompiler’s intermediate representation in preparation for conversion to high-level language code by the back end Explanation:The purpose of the code analysis stage in the decompilation process is to slowly improve the decompiler’s intermediate representation in preparation for conversion to high-level language code by the back end.
Q39.
What is a control flow graph (CFG)?

a.

A graph representation of the internal flow with a single procedure

b.

A graph representation of the internal flow with multiple procedures

c.

A graph representation of the external flow with a single procedure

d.

A graph representation of the external flow with multiple procedures

Discuss
Answer: (a).A graph representation of the internal flow with a single procedure Explanation:A CFG is a graph representation of the internal flow with a single procedure.
Q40.
What is the function of a decompiler front end?

a.

Convert the target machine’s native assembly language into the decompiler’s intermediate representation

b.

Convert the decompiler’s intermediate representation into the target machine’s native assembly language

c.

Eliminate all of the architecture-specific details from the decompiler’s intermediate representation

d.

Analyze the source executable byte by byte and convert each instruction into the decompiler’s intermediate representation

Discuss
Answer: (d).Analyze the source executable byte by byte and convert each instruction into the decompiler’s intermediate representation Explanation:The first step in this process is to go over the source executable byte by byte and analyze each instruction, including its operands. These instructions are then analyzed and converted into the decompiler’s intermediate representation.
Page 4 of 11

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