tree f287ad39f59d3180cc58dc742b4d71320c009d30
parent eb6192cf669ca2a0db71dcd41674fdfc6a6563c4
author Nan Zhang <nanzhang@google.com> 1509570208 -0700
committer Nan Zhang <nanzhang@google.com> 1509685847 -0700

Support parsing int64 in Blueprint file.

Support int64 number instead of int to be more fixed to bit size so
that the underlying arch won't affect overflow cases. Besides,
refection: func (v Value) Int() int64 always cast to int64 no matter the
input is int, int16, int32. Currently we always treat "-" as negative
sign to bind to next value, and "+" as plus operator to add operands
together.
So we allow:
a = 5 + -4 + 5 or a = -4 + 5
But we don't allow:
a = +5 + 4 + -4 since we don't treat "+" as a positive sign, otherwise,
a = 5 + +5 would exist which looks pretty weird. In the future, we may
want fully support number calculator logic eg, "+"/"-" can be
positive/negative sign or operator, and "(" and ")" will be considered
to group expressions with a higher precedence.

int & uint properties within struct keeps unchanged, which is only
allowed when tagged with 'blueprint:mutated'. We only allow *int64
property instead of int64 property within struct since it does't make
sense to do prepending or appending to int64.

Change-Id: I565e046dbd268af3538aee148cd7300037e56523