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#
#
# The Nimrod Compiler
# (c) Copyright 2009 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# This module implements lookup helpers.
import
ast, astalgo, idents, semdata, types, msgs, options, rodread, rnimsyn
type
TOverloadIterMode* = enum
oimDone, oimNoQualifier, oimSelfModule, oimOtherModule, oimSymChoice
TOverloadIter*{.final.} = object
stackPtr*: int
it*: TIdentIter
m*: PSym
mode*: TOverloadIterMode
proc getSymRepr*(s: PSym): string
proc CloseScope*(tab: var TSymTab)
proc AddSym*(t: var TStrTable, n: PSym)
proc addDecl*(c: PContext, sym: PSym)
proc addDeclAt*(c: PContext, sym: PSym, at: Natural)
proc addOverloadableSymAt*(c: PContext, fn: PSym, at: Natural)
proc addInterfaceDecl*(c: PContext, sym: PSym)
proc addInterfaceOverloadableSymAt*(c: PContext, sym: PSym, at: int)
proc lookUp*(c: PContext, n: PNode): PSym
# Looks up a symbol. Generates an error in case of nil.
proc QualifiedLookUp*(c: PContext, n: PNode, ambiguousCheck: bool): PSym
proc InitOverloadIter*(o: var TOverloadIter, c: PContext, n: PNode): PSym
proc nextOverloadIter*(o: var TOverloadIter, c: PContext, n: PNode): PSym
# implementation
proc getSymRepr(s: PSym): string =
case s.kind
of skProc, skMethod, skConverter, skIterator: result = getProcHeader(s)
else: result = s.name.s
proc CloseScope(tab: var TSymTab) =
var
it: TTabIter
s: PSym
# check if all symbols have been used and defined:
if (tab.tos > len(tab.stack)): InternalError("CloseScope")
s = InitTabIter(it, tab.stack[tab.tos - 1])
while s != nil:
if sfForward in s.flags:
liMessage(s.info, errImplOfXexpected, getSymRepr(s))
elif ({sfUsed, sfInInterface} * s.flags == {}) and
(optHints in s.options): # BUGFIX: check options in s!
if not (s.kind in {skForVar, skParam, skMethod, skUnknown}):
liMessage(s.info, hintXDeclaredButNotUsed, getSymRepr(s))
s = NextIter(it, tab.stack[tab.tos - 1])
astalgo.rawCloseScope(tab)
proc AddSym(t: var TStrTable, n: PSym) =
if StrTableIncl(t, n): liMessage(n.info, errAttemptToRedefine, n.name.s)
proc addDecl(c: PContext, sym: PSym) =
if SymTabAddUnique(c.tab, sym) == Failure:
liMessage(sym.info, errAttemptToRedefine, sym.Name.s)
proc addDeclAt(c: PContext, sym: PSym, at: Natural) =
if SymTabAddUniqueAt(c.tab, sym, at) == Failure:
liMessage(sym.info, errAttemptToRedefine, sym.Name.s)
proc addOverloadableSymAt(c: PContext, fn: PSym, at: Natural) =
var check: PSym
if not (fn.kind in OverloadableSyms):
InternalError(fn.info, "addOverloadableSymAt")
check = StrTableGet(c.tab.stack[at], fn.name)
if (check != nil) and not (check.Kind in OverloadableSyms):
liMessage(fn.info, errAttemptToRedefine, fn.Name.s)
SymTabAddAt(c.tab, fn, at)
proc AddInterfaceDeclAux(c: PContext, sym: PSym) =
if (sfInInterface in sym.flags):
# add to interface:
if c.module == nil: InternalError(sym.info, "AddInterfaceDeclAux")
StrTableAdd(c.module.tab, sym)
if getCurrOwner().kind == skModule: incl(sym.flags, sfGlobal)
proc addInterfaceDecl(c: PContext, sym: PSym) =
# it adds the symbol to the interface if appropriate
addDecl(c, sym)
AddInterfaceDeclAux(c, sym)
proc addInterfaceOverloadableSymAt(c: PContext, sym: PSym, at: int) =
# it adds the symbol to the interface if appropriate
addOverloadableSymAt(c, sym, at)
AddInterfaceDeclAux(c, sym)
proc lookUp(c: PContext, n: PNode): PSym =
# Looks up a symbol. Generates an error in case of nil.
case n.kind
of nkAccQuoted:
result = lookup(c, n.sons[0])
of nkSym:
#
# result := SymtabGet(c.Tab, n.sym.name);
# if result = nil then
# liMessage(n.info, errUndeclaredIdentifier, n.sym.name.s);
result = n.sym
of nkIdent:
result = SymtabGet(c.Tab, n.ident)
if result == nil: liMessage(n.info, errUndeclaredIdentifier, n.ident.s)
else: InternalError(n.info, "lookUp")
if IntSetContains(c.AmbiguousSymbols, result.id):
liMessage(n.info, errUseQualifier, result.name.s)
if result.kind == skStub: loadStub(result)
proc QualifiedLookUp(c: PContext, n: PNode, ambiguousCheck: bool): PSym =
var
m: PSym
ident: PIdent
case n.kind
of nkIdent:
result = SymtabGet(c.Tab, n.ident)
if result == nil:
liMessage(n.info, errUndeclaredIdentifier, n.ident.s)
elif ambiguousCheck and IntSetContains(c.AmbiguousSymbols, result.id):
liMessage(n.info, errUseQualifier, n.ident.s)
of nkSym:
#
# result := SymtabGet(c.Tab, n.sym.name);
# if result = nil then
# liMessage(n.info, errUndeclaredIdentifier, n.sym.name.s)
# else
result = n.sym
if ambiguousCheck and IntSetContains(c.AmbiguousSymbols, result.id):
liMessage(n.info, errUseQualifier, n.sym.name.s)
of nkDotExpr:
result = nil
m = qualifiedLookUp(c, n.sons[0], false)
if (m != nil) and (m.kind == skModule):
ident = nil
if (n.sons[1].kind == nkIdent):
ident = n.sons[1].ident
elif (n.sons[1].kind == nkAccQuoted) and
(n.sons[1].sons[0].kind == nkIdent):
ident = n.sons[1].sons[0].ident
if ident != nil:
if m == c.module:
result = StrTableGet(c.tab.stack[ModuleTablePos], ident)
else:
result = StrTableGet(m.tab, ident)
if result == nil:
liMessage(n.sons[1].info, errUndeclaredIdentifier, ident.s)
else:
liMessage(n.sons[1].info, errIdentifierExpected, renderTree(n.sons[1]))
of nkAccQuoted:
result = QualifiedLookup(c, n.sons[0], ambiguousCheck)
else:
result = nil #liMessage(n.info, errIdentifierExpected, '')
if (result != nil) and (result.kind == skStub): loadStub(result)
proc InitOverloadIter(o: var TOverloadIter, c: PContext, n: PNode): PSym =
var ident: PIdent
result = nil
case n.kind
of nkIdent:
o.stackPtr = c.tab.tos
o.mode = oimNoQualifier
while (result == nil):
dec(o.stackPtr)
if o.stackPtr < 0: break
result = InitIdentIter(o.it, c.tab.stack[o.stackPtr], n.ident)
of nkSym:
result = n.sym
o.mode = oimDone #
# o.stackPtr := c.tab.tos;
# o.mode := oimNoQualifier;
# while (result = nil) do begin
# dec(o.stackPtr);
# if o.stackPtr < 0 then break;
# result := InitIdentIter(o.it, c.tab.stack[o.stackPtr], n.sym.name);
# end;
of nkDotExpr:
o.mode = oimOtherModule
o.m = qualifiedLookUp(c, n.sons[0], false)
if (o.m != nil) and (o.m.kind == skModule):
ident = nil
if (n.sons[1].kind == nkIdent):
ident = n.sons[1].ident
elif (n.sons[1].kind == nkAccQuoted) and
(n.sons[1].sons[0].kind == nkIdent):
ident = n.sons[1].sons[0].ident
if ident != nil:
if o.m == c.module:
# a module may access its private members:
result = InitIdentIter(o.it, c.tab.stack[ModuleTablePos], ident)
o.mode = oimSelfModule
else:
result = InitIdentIter(o.it, o.m.tab, ident)
else:
liMessage(n.sons[1].info, errIdentifierExpected, renderTree(n.sons[1]))
of nkAccQuoted:
result = InitOverloadIter(o, c, n.sons[0])
of nkSymChoice:
o.mode = oimSymChoice
result = n.sons[0].sym
o.stackPtr = 1
else:
nil
if (result != nil) and (result.kind == skStub): loadStub(result)
proc nextOverloadIter(o: var TOverloadIter, c: PContext, n: PNode): PSym =
case o.mode
of oimDone:
result = nil
of oimNoQualifier:
if n.kind == nkAccQuoted:
result = nextOverloadIter(o, c, n.sons[0]) # BUGFIX
elif o.stackPtr >= 0:
result = nextIdentIter(o.it, c.tab.stack[o.stackPtr])
while (result == nil):
dec(o.stackPtr)
if o.stackPtr < 0: break
result = InitIdentIter(o.it, c.tab.stack[o.stackPtr], o.it.name) # BUGFIX:
# o.it.name <-> n.ident
else:
result = nil
of oimSelfModule:
result = nextIdentIter(o.it, c.tab.stack[ModuleTablePos])
of oimOtherModule:
result = nextIdentIter(o.it, o.m.tab)
of oimSymChoice:
if o.stackPtr < sonsLen(n):
result = n.sons[o.stackPtr].sym
inc(o.stackPtr)
else:
result = nil
if (result != nil) and (result.kind == skStub): loadStub(result)
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