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#
#
# The Nimrod Compiler
# (c) Copyright 2011 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# This module does the instantiation of generic procs and types.
import ast, astalgo, msgs, types, semdata
proc checkConstructedType*(info: TLineInfo, t: PType) =
if tfAcyclic in t.flags and skipTypes(t, abstractInst).kind != tyObject:
LocalError(info, errInvalidPragmaX, "acyclic")
elif computeSize(t) < 0:
LocalError(info, errIllegalRecursionInTypeX, typeToString(t))
elif t.kind == tyVar and t.sons[0].kind == tyVar:
LocalError(info, errVarVarTypeNotAllowed)
when false:
if t.kind == tyObject and t.sons[0] != nil:
if t.sons[0].kind != tyObject or tfFinal in t.sons[0].flags:
localError(info, errInheritanceOnlyWithNonFinalObjects)
proc containsGenericTypeIter(t: PType, closure: PObject): bool =
result = t.kind in GenericTypes
proc containsGenericType*(t: PType): bool =
result = iterOverType(t, containsGenericTypeIter, nil)
proc searchInstTypes(tab: TIdTable, key: PType): PType =
# returns nil if we need to declare this type
result = PType(IdTableGet(tab, key))
if result == nil and tab.counter > 0:
# we have to do a slow linear search because types may need
# to be compared by their structure:
for h in countup(0, high(tab.data)):
var t = PType(tab.data[h].key)
if t != nil:
if key.containerId == t.containerID:
var match = true
for j in countup(0, sonsLen(t) - 1):
# XXX sameType is not really correct for nested generics?
if not sameType(t.sons[j], key.sons[j]):
match = false
break
if match:
return PType(tab.data[h].val)
type
TReplTypeVars* {.final.} = object
c*: PContext
typeMap*: TIdTable # map PType to PType
symMap*: TIdTable # map PSym to PSym
info*: TLineInfo
proc ReplaceTypeVarsT*(cl: var TReplTypeVars, t: PType): PType
proc ReplaceTypeVarsS(cl: var TReplTypeVars, s: PSym): PSym
proc ReplaceTypeVarsN(cl: var TReplTypeVars, n: PNode): PNode =
if n != nil:
result = copyNode(n)
result.typ = ReplaceTypeVarsT(cl, n.typ)
case n.kind
of nkNone..pred(nkSym), succ(nkSym)..nkNilLit:
nil
of nkSym:
result.sym = ReplaceTypeVarsS(cl, n.sym)
else:
var length = sonsLen(n)
if length > 0:
newSons(result, length)
for i in countup(0, length - 1):
result.sons[i] = ReplaceTypeVarsN(cl, n.sons[i])
proc ReplaceTypeVarsS(cl: var TReplTypeVars, s: PSym): PSym =
if s == nil: return nil
result = PSym(idTableGet(cl.symMap, s))
if result == nil:
result = copySym(s, false)
incl(result.flags, sfFromGeneric)
idTablePut(cl.symMap, s, result)
result.typ = ReplaceTypeVarsT(cl, s.typ)
result.owner = s.owner
result.ast = ReplaceTypeVarsN(cl, s.ast)
proc lookupTypeVar(cl: TReplTypeVars, t: PType): PType =
result = PType(idTableGet(cl.typeMap, t))
if result == nil:
GlobalError(t.sym.info, errCannotInstantiateX, typeToString(t))
elif result.kind == tyGenericParam:
InternalError(cl.info, "substitution with generic parameter")
proc ReplaceTypeVarsT*(cl: var TReplTypeVars, t: PType): PType =
var body, newbody, x, header: PType
result = t
if t == nil: return
case t.kind
of tyGenericParam:
result = lookupTypeVar(cl, t)
of tyGenericInvokation:
body = t.sons[0]
if body.kind != tyGenericBody: InternalError(cl.info, "no generic body")
header = nil
for i in countup(1, sonsLen(t) - 1):
if t.sons[i].kind == tyGenericParam:
x = lookupTypeVar(cl, t.sons[i])
if header == nil: header = copyType(t, t.owner, false)
header.sons[i] = x
else:
x = t.sons[i]
idTablePut(cl.typeMap, body.sons[i - 1], x)
if header == nil: header = t
result = searchInstTypes(gInstTypes, header)
if result != nil: return
result = newType(tyGenericInst, t.sons[0].owner)
for i in countup(0, sonsLen(t) - 1):
# if one of the params is not concrete, we cannot do anything
# but we already raised an error!
addSon(result, header.sons[i])
idTablePut(gInstTypes, header, result)
newbody = ReplaceTypeVarsT(cl, lastSon(body))
newbody.n = ReplaceTypeVarsN(cl, lastSon(body).n)
addSon(result, newbody)
#writeln(output, ropeToStr(Typetoyaml(newbody)));
checkConstructedType(cl.info, newbody)
of tyGenericBody:
InternalError(cl.info, "ReplaceTypeVarsT: tyGenericBody")
result = ReplaceTypeVarsT(cl, lastSon(t))
else:
if containsGenericType(t):
result = copyType(t, t.owner, false)
for i in countup(0, sonsLen(result) - 1):
result.sons[i] = ReplaceTypeVarsT(cl, result.sons[i])
result.n = ReplaceTypeVarsN(cl, result.n)
if result.Kind in GenericTypes:
LocalError(cl.info, errCannotInstantiateX, TypeToString(t, preferName))
#writeln(output, ropeToStr(Typetoyaml(result)))
#checkConstructedType(cl.info, result)
proc generateTypeInstance*(p: PContext, pt: TIdTable, arg: PNode,
t: PType): PType =
var cl: TReplTypeVars
InitIdTable(cl.symMap)
copyIdTable(cl.typeMap, pt)
cl.info = arg.info
cl.c = p
pushInfoContext(arg.info)
result = ReplaceTypeVarsT(cl, t)
popInfoContext()
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