#11868: PARI library interface broken by design
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Reporter: jdemeyer | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.3
Component: interfaces | Keywords: t0GEN t1GEN gen
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Description changed by jdemeyer:
Old description:
> The `t0GEN()`, `t1GEN()`,... system in the PARI interface is broken by
> design. Apply [attachment:demonstrate_11868.patch] to see the bug in
> action.
>
> The problem is that the conversion of `b` (Python object) to `t1` (PARI
> GEN) uses the PARI stack and therefore it clobbers the previously
> computed `t0`.
New description:
The `t0GEN()`, `t1GEN()`,... system in the PARI interface is broken by
design. Apply [attachment:demonstrate_11868.patch] to see the bug in
action.
The problem is that the conversion of `b` (Python object) to `t1` (PARI
GEN) uses the PARI stack and therefore it clobbers the previously computed
`t0`.
There is no urgent need to fix this, as the bug doesn't seem to occur in
practice (it was discovered when working on #9334). It only occurs when:
1. Calling a PARI function with at least 2 arguments besides `self`.
2. Apart from the first non-`self` argument, there should be another
argument which is a "complicated" Python type (e.g. a number field
element).
As work-around, it is easy to defeat condition 2 by converting arguments
to pari before calling the function.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11868#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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