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typedesc and expr params

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types are now valid proc/template/macro params and you can overload over them:
proc foo(T: typedesc)        # accept any type
proc foo(T: typedesc{int}) # overload specifically for int
proc foo(T: typedesc{int or float or Callable}) # overload for any type matching the constraints

expr{type} is a param expecting compile time value of the designated type (or type class).

when typedesc or expr params are used with a proc, the proc will be instantiated once
for each unique type/value used as parameter.
This commit is contained in:
Zahary Karadjov 2012-03-29 16:03:51 +03:00
commit 22dc76a361
14 changed files with 218 additions and 45 deletions
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8
compiler/ccgtypes.nim
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@ -7,6 +7,8 @@
# distribution, for details about the copyright.
#
# included from cgen.nim
# ------------------------- Name Mangling --------------------------------
proc mangle(name: string): string =
@ -48,6 +50,9 @@ proc mangleName(s: PSym): PRope =
app(result, toRope(s.id))
s.loc.r = result
proc isCompileTimeOnly(t: PType): bool =
result = t.kind in {tyTypedesc, tyExpr}
proc getTypeName(typ: PType): PRope =
if (typ.sym != nil) and ({sfImportc, sfExportc} * typ.sym.flags != {}) and
(gCmd != cmdCompileToLLVM):
@ -187,6 +192,7 @@ proc genProcParams(m: BModule, t: PType, rettype, params: var PRope,
for i in countup(1, sonsLen(t.n) - 1):
if t.n.sons[i].kind != nkSym: InternalError(t.n.info, "genProcParams")
var param = t.n.sons[i].sym
if isCompileTimeOnly(param.typ): continue
fillLoc(param.loc, locParam, param.typ, mangleName(param), OnStack)
app(params, getParamTypeDesc(m, param.typ, check))
if ccgIntroducedPtr(param):
@ -206,8 +212,8 @@ proc genProcParams(m: BModule, t: PType, rettype, params: var PRope,
arr = arr.sons[0]
if i < sonsLen(t.n) - 1: app(params, ", ")
if (t.sons[0] != nil) and isInvalidReturnType(t.sons[0]):
if params != nil: app(params, ", ")
var arr = t.sons[0]
if params != nil: app(params, ", ")
app(params, getTypeDescAux(m, arr, check))
if (mapReturnType(t.sons[0]) != ctArray) or (gCmd == cmdCompileToLLVM):
app(params, "*")