Read e-book online An APL Compiler PDF
By Timothy Budd
Presents the result of an research into the problems raised by way of the improvement of a compiler for APL, a really excessive point machine programming language. APL offers a couple of novel difficulties for a compiler author: susceptible variable typing, run time adjustments in variable form, and a number of primitive operations. throughout the integration of a number of lately built compiler building suggestions, reminiscent of facts stream research, and a singular and house effective call for pushed or lazy overview method of code iteration, the writer has been in a position to produce a real compiler for the language whereas nonetheless keeping the felxibility and simplicity which are the hallmarks of APL.
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Type / rank / shape values. These are structures used to maintain type, rank, and shape information, should it be required to be gathered in one place or maintained for a long period of time. For example, TRS structures are passed along with each argument in evaluating a user defined function. Memory pointers. These are pointers that can point to any of the three scalar types (integer, real, or character). 2. 3. 4. Chapter 4 Simple Space Efficient Functions The demand driven evaluation technique described in the last chapter works best with functions that are space efficient.
3. Code Generation Overview 39 required a separate section of code, particularly since, at compile time, we may not know how many times a value request will be needed. Instead, we modify the messages we will generate so that only one value request need be issued to generate an arbitrary element. The new messages can be described as follows: 1. Generate a section of code that will, when executed, return the type, rank, and shape of the values that you will produce. Respond with the locations that these values will occupy at run time.
4. Rebind the identifier being assigned to the new values. Note that rebinding the name to the new values is performed last, after all the values have been read. This is so that expressions such as A +-A +1 will perform as expected and not overwrite the old value before it has been used as part of the computation. 1. Nested Assignment The algorithm presented in the last chapter assumed that the assignment function was the topmost function in an expression. This need not be the case, as an assignment can be used within an expression, for example: A+-(1+B+-L7) 1.
An APL Compiler by Timothy Budd