Translating an object graph at run time

Details Translating an object graph at run time Translating an object graph at run time

1995-06-07

1998-11-17

Trammell, James P.

G06F 945

Patent

active

058389776

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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patent: 5535386 (1996-07-01), Wang
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Kernighan et al., "The C Programming Language, " Prentice Hall, Englewood Cliffs, NJ, 2nd Ed., sections 6.1 and 6.2 (pp. 127-132), 6.7 (pp. 164-147), and A12 (pp. 228-233). 1988.
Booch, Grady, "Software Components with Ada," Benjamin/Cummings Publishing, Menlo Park, CA, Ch. 2 (pp. 10-32). 1987.

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