Any static, global analysis of the expression and data relationships in a program requires a knowledge of the control flow of the program. Since one of the primary reasons for doing such a global analysis in a compiler is to produce optimized programs, control flow analysis has been embedded in many compilers and has been described in several papers. An early paper by Prosser [5] described the use of Boolean matrices (or, more particularly, connectivity matrices) in flow analysis. The use of “dominance” relationships in flow analysis was first introduced by Prosser and much expanded by Lowry and Medlock [6]. References [6,8,9] describe compilers which use various forms of control flow analysis for optimization. Some recent developments in the area are reported in [4] and in [7]. The underlying motivation in all the different types of control flow analysis is the need to codify the flow relationships in the program. The codification may be in connectivity matrices, in predecessor-successor tables, in dominance lists, etc. Whatever the form, the purpose is to facilitate determining what the flow relationships are; in other words to facilitate answering such questions as: is this an inner loop?, if an expression is removed from the loop where can it be correctly and profitably placed?, which variable definitions can affect this use? In this paper the basic control flow relationships are expressed in a directed graph. Various graph constructs are then found and shown to codify interesting global relationships.

Control flow analysis

/pdf/a-bibliography-of-publications-about-the-fortran-programming-q3kg2hu189.pdf

A Bibliography of Publications about the Fortran Programming Language: Part 1: 1956{1980

This roster contains a list of currently existing high-level languages which (a) have been develcped or reported in the United States; (b) have been implemented on at least one general-purpose computer; and (c) are believed to ~e in use in the United States by someone other than the developer. In a few cases of exceptional interest, these basic ground rules have been violated; in p~rticular, some new languages have been included even though their actual broad usage is somewhat less certain. The reason for excluding non-U.S, activities is definitely n o~ because they are deemed inferior; the reasons are (a) the time and effort to include them would be too great and (b) the multiple sources on non-~.S, developments are not generally available to th~ author and a partial list is deemed worse than no list. while every effort has b~en made to make this list both complete and accurate, inevitably some errors of omission or commission have occurred. The author would appreciate notice of these errors for cbr~ection in futur~ rosters, subject to the constraints in the following paragraph. No attempt has been made to decide whether a language is "good": if it satisfies the criteria indicated above and below, it is included. However, since a listing of this type inevitably represents certain technical value judgments, it should be made clear that the opinions stated or implied are (only) the personal views of the author.

Roster of programming languages for 1976-77

Roster of Programming Languages for 1974-75.

Extensive software problems confront an organization which possesses a number of different computers and which frequently acquire new ones To maintain cohesion, a system must be developed, written in a high level language, which minimizes machine dependencies and isolates those which are necessary A language and a compiler for that language are discussed hereThe language, called LRLTRAN, is a heavily augmented FORTRAN The three-pass compiler makes use internally of a postfix Polish notation (pass I to pass II) and a free representation referred to as a “composite blocking table” (pass I to pass III) Machine-independent optimization occurs in pass II and DO-loop and machine-dependent optimization in pass III

The LRLTRAN compiler

The use and implementation of two new FORTRAN format conversions are discussed. These format types give the FORTRAN programmer control of input/output specifications at execution time.

Dynamic format specifications

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The LRLTRAN compiler

Dynamic format specifications