all type-specific value functions, and use ZeroVal to create
new frames. Remove Value.Type; it was unused and difficult
for values with composite types. Add Value.Assign methods.
R=rsc
APPROVED=rsc
DELTA=282 (135 added, 90 deleted, 57 changed)
OCL=31894
CL=31930
Some cleanup. Elem() on PtrType is now just Elem and matches
with ArrayType. Generators now switch over the result type
instead of the operand type. Delete unused diag function.
R=rsc
APPROVED=rsc
DELTA=281 (219 added, 18 deleted, 44 changed)
OCL=31876
CL=31891
container for values.
Instead of having one evaluator function that returns a
generic Value, there is now an evaluator function for each
generalized type that simply returns a native type.
The compiler is more type-safe now because there are almost no
type conversions at evaluation time and it's impossible to
invoke a nil evaluator function during evaluation. This also
makes ideals and pointers really clean.
As an added bonus, expression evaluation should be faster
because it doesn't require heap allocation for every
intermediate value, type switches, or lots of conversions to
and from Value. It also involves fewer function calls.
R=rsc
APPROVED=rsc
DELTA=431 (280 added, 115 deleted, 36 changed)
OCL=31705
CL=31709
pointer types, supports literals, identifiers, type-checking
most unary and binary operators, "compiling" a few unary and
binary operators, and assignment and declaration statements.
R=rsc
APPROVED=rsc
DELTA=1751 (1751 added, 0 deleted, 0 changed)
OCL=31309
CL=31691
