dbX: a persistent programming language model

Details dbX: a persistent programming language model dbX: a persistent programming language model

1991-10-31

1998-10-13

Kriess, Kevin A.

395613, G06F 944

Patent

active

058225900

ABSTRACT:
The dbX persistent programming language model solves the problem of seamlessly providing an unfragmented, persistible, complex object heap space that extends beyond virtual memory to a program in a host programming language X. It does so without rewriting a compiler for X and without operating system or hardware dependencies. It uses a memory pointer as a pointer to a persistible object, with the lvalue of the pointer providing a hook to the OID of the object. The lvalues of pointers to persistible objects, their associated OIDs and other information about persistible objects are maintained in a global data structure. Unresolved pointers to persistible objects point to an unusable area of memory, and dereferencing them triggers object faulting. A keyword and an overloaded allocation operator are used to identify statically and dynamically allocated pieces of memory respectively as persistible. A preprocessor processes occurrences of the keyword and operator, and some operations on pointers to persistible objects in a dbX program and generates X code. Object translation uses a `pointer view of memory` and an `allocation view of memory` to determine the runtime structure of an object graph, and it is resilient to pointer casting and pointing to objects embedded in larger objects.

REFERENCES:
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Software--Practice and Experience, "Object Management in a Persistent Smalltalk System", pp. 719-737, vol. 19, No. 8, Aug. 1989.
2nd Int. Workshop on Advances in Object Oriented Database Systems, "Zeitgeist: Database Support for Object-Oriented Programming", pp. 23-42, Ebernburg, Sep. 1988.
"Design of a Persistent Programming Environment in an Object Oriented Language Using Clustering and Composite Objects", M.N. Sim & P.M. DeWilde, the Netherlands, 1991 IEEE.

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