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//
//
// The Nimrod Compiler
// (c) Copyright 2008 Andreas Rumpf
//
// See the file "copying.txt", included in this
// distribution, for details about the copyright.
//
unit importer;
// This module implements the symbol importing mechanism.
interface
{$include 'config.inc'}
uses
nsystem, charsets, strutils, nos,
ast, astalgo, msgs, options, idents, rodread, lookups, semdata, passes;
function evalImport(c: PContext; n: PNode): PNode;
function evalFrom(c: PContext; n: PNode): PNode;
procedure importAllSymbols(c: PContext; fromMod: PSym);
function getModuleFile(n: PNode): string;
implementation
function findModule(const info: TLineInfo; const modulename: string): string;
// returns path to module
begin
result := options.FindFile(AddFileExt(modulename, nimExt));
if result = '' then liMessage(info, errCannotOpenFile, modulename);
end;
function getModuleFile(n: PNode): string;
begin
case n.kind of
nkStrLit, nkRStrLit, nkTripleStrLit: begin
result := findModule(n.info, UnixToNativePath(n.strVal));
end;
nkIdent: begin
result := findModule(n.info, n.ident.s);
end;
nkSym: begin
result := findModule(n.info, n.sym.name.s);
end;
else begin
internalError(n.info, 'getModuleFile()');
result := '';
end
end
end;
procedure rawImportSymbol(c: PContext; s: PSym);
var
check, copy, e: PSym;
j: int;
etyp: PType; // enumeration type
it: TIdentIter;
begin
// This does not handle stubs, because otherwise loading on demand would be
// basically pointless. So importing stubs is fine here!
copy := s; // do not copy symbols when importing!
// check if we have already a symbol of the same name:
check := StrTableGet(c.tab.stack[importTablePos], s.name);
if (check <> nil) and (check.id <> copy.id) then begin
if not (s.kind in OverloadableSyms) then begin
// s and check need to be qualified:
IntSetIncl(c.AmbiguousSymbols, copy.id);
IntSetIncl(c.AmbiguousSymbols, check.id);
end
end;
StrTableAdd(c.tab.stack[importTablePos], copy);
if s.kind = skType then begin
etyp := s.typ;
if etyp.kind in [tyBool, tyEnum] then begin
for j := 0 to sonsLen(etyp.n)-1 do begin
e := etyp.n.sons[j].sym;
if (e.Kind <> skEnumField) then
InternalError(s.info, 'rawImportSymbol');
// BUGFIX: because of aliases for enums the symbol may already
// have been put into the symbol table
// BUGFIX: but only iff they are the same symbols!
check := InitIdentIter(it, c.tab.stack[importTablePos], e.name);
while check <> nil do begin
if check.id = e.id then begin e := nil; break end;
check := NextIdentIter(it, c.tab.stack[importTablePos]);
end;
if e <> nil then rawImportSymbol(c, e);
//check := StrTableGet(c.tab.stack[importTablePos], e.name);
//if (check = nil) or (check.id <> e.id) then
// rawImportSymbol(c, e)
end
end
end
else if s.kind = skConverter then
addConverter(c, s); // rodgen assures that converters are no stubs
end;
procedure importSymbol(c: PContext; ident: PNode; fromMod: PSym);
var
s, e: PSym;
it: TIdentIter;
begin
if (ident.kind <> nkIdent) then InternalError(ident.info, 'importSymbol');
s := StrTableGet(fromMod.tab, ident.ident);
if s = nil then
liMessage(ident.info, errUndeclaredIdentifier, ident.ident.s);
if s.kind = skStub then loadStub(s);
if not (s.Kind in ExportableSymKinds) then
InternalError(ident.info, 'importSymbol: 2');
// for an enumeration we have to add all identifiers
case s.Kind of
skProc, skMethod, skIterator, skMacro, skTemplate, skConverter: begin
// for a overloadable syms add all overloaded routines
e := InitIdentIter(it, fromMod.tab, s.name);
while e <> nil do begin
if (e.name.id <> s.Name.id) then
InternalError(ident.info, 'importSymbol: 3');
rawImportSymbol(c, e);
e := NextIdentIter(it, fromMod.tab);
end
end;
else rawImportSymbol(c, s)
end
end;
procedure importAllSymbols(c: PContext; fromMod: PSym);
var
i: TTabIter;
s: PSym;
begin
s := InitTabIter(i, fromMod.tab);
while s <> nil do begin
if s.kind <> skModule then begin
if s.kind <> skEnumField then begin
if not (s.Kind in ExportableSymKinds) then
InternalError(s.info, 'importAllSymbols: ' + symKindToStr[s.kind]);
rawImportSymbol(c, s); // this is correct!
end
end;
s := NextIter(i, fromMod.tab)
end
end;
function evalImport(c: PContext; n: PNode): PNode;
var
m: PSym;
i: int;
f: string;
begin
result := n;
for i := 0 to sonsLen(n)-1 do begin
f := getModuleFile(n.sons[i]);
m := gImportModule(f);
if sfDeprecated in m.flags then
liMessage(n.sons[i].info, warnDeprecated, m.name.s);
// ``addDecl`` needs to be done before ``importAllSymbols``!
addDecl(c, m); // add symbol to symbol table of module
importAllSymbols(c, m);
end;
end;
function evalFrom(c: PContext; n: PNode): PNode;
var
m: PSym;
i: int;
f: string;
begin
result := n;
checkMinSonsLen(n, 2);
f := getModuleFile(n.sons[0]);
m := gImportModule(f);
n.sons[0] := newSymNode(m);
addDecl(c, m); // add symbol to symbol table of module
for i := 1 to sonsLen(n)-1 do importSymbol(c, n.sons[i], m);
end;
end.
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