adding syntax support for externally defined distributions and functions

[lileicc]

@cberzan @jxwuyi @datang1992 @tejasvsrinivasan

distribution Real Gaussian(Real mu, Real variance);
extern Real abs(Real x);

[lileicc]

@cberzan
would you please check why it fails the test?

[lileicc]

solved compilation issue.

[lileicc]

I have another thought about extern.

extern might not be necessary. Since we can already write,

fixed Real abs(Real abs) = blog.model.AbsInterp();

Or we should even simplify it to be

fixed Real abs(Real abs) = blog.model.AbsInterp;

[lileicc]

extern Real abs(Real x);

distribution Real Gaussian(Real mu, Real variance);

[cberzan]

@lileicc Are you still changing this, or should I review?

[lileicc]

This is not ready for review yet. Since it needs support in Semant.java.

On Wed, Oct 1, 2014 at 5:24 PM, cberzan notifications@github.com wrote:

@lileicc https://github.com/lileicc Are you still changing this, or
should I review?

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