Oct 3, 2024 · Data flow analysis is a technique used in compiler design to analyze how data flows through a program. It involves tracking the values of variables and expressions as they are …

What is Data Flow Analysis? • Data flow analysis: –Flow-sensitive: sensitive to the control flow in a function –intraprocedural analysis; only on pseudo variables (no aliases) • Examples of …

Exercise 1: What would the lattice for simple Sign Analysis look like? Extension of simple Sign Analysis to track when x<0, x<=0, x=0, x>=0, x>0, x!=0, or unknown ( ̄\_( ツ)_/ ̄). Q: Why do …

Data Flow Analysis Schema • Build a flow graph (nodes = basic blocks, edges = control flow) • Set up a set of equations between in[b] and out[b] for all basic blocks b

This article describes how data flow analysis is implemented in the CodeQL libraries for C/C++ and includes examples to help you write your own data flow queries. The following sections …

Below are examples illustrating two dataflow-analysis problems: constant propagation and live-variable analysis. Both examples use the following program: 1. k = 2; 2. if (...) { 3. a = k + 2; 4. …

Data flow analysis is a static analysis technique that proves facts about a program or its fragment. It can make conclusions about all paths through the program, while taking control flow into …

Data flow analysis • Derives informaon about the dynamic behavior of a program by only examining the stac code • Intraprocedural analysis • Flow-sensi=ve: sensi=ve to the control …

Just as data-flow analysis of “reaching definitions” can tell what definitions of x might reach a point, another DFA can eliminate cases where pdefinitely does not point to x. Example : the …

In this lecture we first extend liveness analysis from Lecture 4 to handle memory ref-erences and then consider neededness analysis which is similar to liveness and used to discover dead …