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In computer science, pointer analysis, or points-to analysis, is a static code analysis technique that establishes which pointers, or heap references, can point to which variables, or storage locations.
In computer programming, tracing garbage collection is a form of automatic memory management that consists of determining which objects should be deallocated ("garbage collected") by tracing which objects are reachable by a chain of references from certain "root" objects, and considering the rest as "garbage" and collecting them.
Depending on the operating system, the CPU can automatically detect such an invalid access (e.g. for the null value: a null pointer dereference error). This supports in analyzing the actual reason, a programming error, in debugging , and it can also be used to abort the program in production use, to prevent it from continuing with invalid data ...
A compiler can use the results of escape analysis as a basis for optimizations: [1] Converting heap allocations to stack allocations. [2] If an object is allocated in a subroutine, and a pointer to the object never escapes, the object may be a candidate for stack allocation instead of heap allocation.
System Reliability Toolkit: [25] an 865-page document published in 2005, which is the result of a collaborative effort by DACS and the Reliability Information Analysis Center (RIAC), to produce a document that addresses (in addition to hardware) the software and human factors that have an ever more significant impact on system reliability.
Replacing expressions consisting of constants (e.g., 3 + 5) with their final value (8) at compile time, rather than doing the calculation in run-time. [10] Used in most modern languages. Induction variable recognition and elimination See discussion above about induction variable analysis. Alias classification and pointer analysis
Flow based analysis can be used in lieu of or to supplement type based analysis. In flow based analysis, new alias classes are created for each memory allocation, and for every global and local variable whose address has been used. References may point to more than one value over time and thus may be in more than one alias class.
Unfortunately, most pointer analyses have difficulty analyzing this program precisely. In order to determine points-to sets, a pointer analysis must be able to name a program's objects. In general, programs can allocate an unbounded number of objects; but in order to terminate, a pointer analysis can only use a finite set of names.