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From: "bubble" <bubble@riskm.com.tw>
Newsgroups: comp.lang.ada
Subject: function "&" for strings type cause memory problem.
Date: Thu, 10 Nov 2005 16:25:09 +0800
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Date: 2005-11-10T16:25:09+08:00
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dear all:
I have a project need mix 2 language (VB and Ada).


VB do GUI  and monitor the real time quote then trigger kernel work.
Ada with gnatcom to do kernel work (financial model pricing).

in the project, a code snip will raise storage_error excpeiton because I 
combine 2  BIG string to 1 string.

I test the code snip and I get some problem in the statement, Nstring2 := 
new String'(String1 & String2) .

if I compiling the code to stand alone execute file and enable pragma 
Linker_Options ("-Wl,--stack=0x10000000");
It both  passed.
if I compiling it to DLL ,it pass test 1 and fail in test2

                                                    Test 1              | 
Test 2
-----------------------------------------------------------------------------------------------
.exe with Linker_Options       |     Pass 
Pass
.exe without Liner_Options    |     Pass                                Fail
.dll with Linker_Options         |    Pass 
Fail
.dll without Linker_Options    |    Pass 
Fail

Test Environment
----------------------------------------------------------------------------------------------
OS:Windows XP.
memory :640 MB.
VB: Microsoft Visual Basic 6
gnatcom version: 1.4
ada compiler: Gnat GPL 2005



I guess functin "&" for string type may have potential  problem in gnat 
windows editions.
does any body know the problem and give me some suggestion.
thanks








Test Code
--------------------------------------------------------------------------------------------------
with Ada.Text_IO;
Use Ada.Text_Io;

procedure test is
   --pragma Linker_Options ("-Wl,--stack=0x10000000");
   type access_string is access all String;
   String1 : String := (1 .. 10_000_000 => 'a');
   String2 : String := (1 .. 10_000_000 => 'b');

begin
   declare
      nString : access_string := null;
   begin
      nString:= new String (1 .. String1'Length + String2'Length);
      nString.all (String1'First .. String2'Last) := String1;
      nString.all ( String1'First + String2'First.. String1'First + 
String2'Last):= String2;
      Put_Line("Test 1 Passed");
   Exception
      When Others=>
         Put_Line("Test 1 Fail");
   end;
   declare
      Nstring2 : access_string := null;
   begin
      Nstring2 := new String'(String1 & String2);
      Put_Line("Test 2 Passed ");
   exception
      when others =>
         Ada.Text_IO.Put_Line ("Test 2 Fail");
   end;
end test;