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-rwxr-xr-xnim/procfind.pas120
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diff --git a/nim/procfind.pas b/nim/procfind.pas
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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.
-//
-unit procfind;
-
-// This module implements the searching for procs and iterators.
-// This is needed for proper handling of forward declarations.
-
-interface
-
-{$include 'config.inc'}
-
-uses 
-  nsystem, ast, astalgo, msgs, semdata, types, trees;
-
-function SearchForProc(c: PContext; fn: PSym; tos: int): PSym;
-// Searchs for the fn in the symbol table. If the parameter lists are exactly
-// the same the sym in the symbol table is returned, else nil.
-
-function SearchForBorrowProc(c: PContext; fn: PSym; tos: int): PSym;
-// Searchs for the fn in the symbol table. If the parameter lists are suitable
-// for borrowing the sym in the symbol table is returned, else nil.
-
-implementation
-
-function equalGenericParams(procA, procB: PNode): Boolean;
-var
-  a, b: PSym;
-  i: int;
-begin
-  result := procA = procB;
-  if result then exit;
-  if (procA = nil) or (procB = nil) then exit;
-  
-  if sonsLen(procA) <> sonsLen(procB) then exit;
-  for i := 0 to sonsLen(procA)-1 do begin
-    if procA.sons[i].kind <> nkSym then
-      InternalError(procA.info, 'equalGenericParams');
-    if procB.sons[i].kind <> nkSym then
-      InternalError(procB.info, 'equalGenericParams');
-    a := procA.sons[i].sym;
-    b := procB.sons[i].sym;
-    if (a.name.id <> b.name.id) or not sameTypeOrNil(a.typ, b.typ) then exit;
-    if (a.ast <> nil) and (b.ast <> nil) then
-      if not ExprStructuralEquivalent(a.ast, b.ast) then exit;
-  end;
-  result := true
-end;
-
-function SearchForProc(c: PContext; fn: PSym; tos: int): PSym;
-var
-  it: TIdentIter;
-begin
-  result := initIdentIter(it, c.tab.stack[tos], fn.Name);
-  while result <> nil do begin
-    if (result.Kind = fn.kind) then begin
-      if equalGenericParams(result.ast.sons[genericParamsPos], 
-                            fn.ast.sons[genericParamsPos]) then begin
-        case equalParams(result.typ.n, fn.typ.n) of
-          paramsEqual: exit;
-          paramsIncompatible: begin
-            liMessage(fn.info, errNotOverloadable, fn.name.s);
-            exit
-          end;
-          paramsNotEqual: begin end; // continue search
-        end;
-      end
-    end;
-    result := NextIdentIter(it, c.tab.stack[tos])
-  end
-end;
-
-function paramsFitBorrow(a, b: PNode): bool;
-var
-  i, len: int;
-  m, n: PSym;
-begin
-  len := sonsLen(a);
-  result := false;
-  if len = sonsLen(b) then begin
-    for i := 1 to len-1 do begin
-      m := a.sons[i].sym;
-      n := b.sons[i].sym;
-      assert((m.kind = skParam) and (n.kind = skParam));
-      if not equalOrDistinctOf(m.typ, n.typ) then exit;
-    end;
-    // return type:
-    if not equalOrDistinctOf(a.sons[0].typ, b.sons[0].typ) then exit;
-    result := true
-  end
-end;
-
-function SearchForBorrowProc(c: PContext; fn: PSym; tos: int): PSym;
-// Searchs for the fn in the symbol table. If the parameter lists are suitable
-// for borrowing the sym in the symbol table is returned, else nil.
-var
-  it: TIdentIter;
-  scope: int;
-begin
-  for scope := tos downto 0 do begin
-    result := initIdentIter(it, c.tab.stack[scope], fn.Name);
-    while result <> nil do begin
-      // watchout! result must not be the same as fn!
-      if (result.Kind = fn.kind) and (result.id <> fn.id) then begin
-        if equalGenericParams(result.ast.sons[genericParamsPos], 
-                              fn.ast.sons[genericParamsPos]) then begin
-          if paramsFitBorrow(fn.typ.n, result.typ.n) then exit;
-        end
-      end;
-      result := NextIdentIter(it, c.tab.stack[scope])
-    end
-  end
-end;
-
-end.