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0001190Frama-CKernelpublic2012-06-08 15:382012-06-09 16:04
Anne 
virgile 
normalminorhave not tried
assignedopen 
Frama-C Nitrogen-20111001 
 
0001190: __builtin_alloca
In a file with a local array which size in defined by a variable : float a[n]; I get : [kernel] warning: Variable-sized local variable a which is ok. But then, when I use the value analysis, I get : [kernel] warning: No code for function __builtin_alloca, default assigns generated because the declaration has been translated in : __lengthofa = (unsigned int)n; a = (float *)__builtin_alloca(sizeof(*a) * __lengthofa); which looks fine, but the question is : shouldn't the assigns property be defined somewhere inside Frama-C for the builtin functions ? As a workaround, what prototype and assigns should I write for this function.
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Issue History
2012-06-08 15:38AnneNew Issue
2012-06-08 17:31signolesStatusnew => assigned
2012-06-08 17:31signolesAssigned To => virgile
2012-06-09 16:04yakobowskiNote Added: 0003069

Notes
(0003069)
yakobowski   
2012-06-09 16:04   
Within Value, __builtin_alloca should be stubbed by a malloc-like builtin. Some of the existing builtins in malloc.h could be used.