From: codeallergy <romainbeckers@gmail.com>
Subject: Re: Ada and string literals
Date: Wed, 30 Jan 2013 14:54:01 -0800 (PST)
Date: 2013-01-30T14:54:01-08:00 [thread overview]
Message-ID: <ea8d08fe-fa00-491b-bf89-29dade053f62@googlegroups.com> (raw)
In-Reply-To: <4978d638-a04b-4561-85e9-cf6620265af2@googlegroups.com>
Thanks for answering.
i reversed the generated code. when u use a literal as a argument like this
Put_Line("HELLO");
Abc("HELLO");
the same string from the data section is shared. when you use constants from a package like this
package Abc is
str1 : aliased constant String : "LITERAL";
str2 : aliased constant String : "LITERAL";
end Abc;
strings are duplicated and put into the data section, aliased or not. when you use constant from a procedure header (dunno how u name that) like this
procedure Abc
is
str1 : aliased constant String : "LITERAL";
begin
null;
end Abc;
if the constant is aliased, the constant is not put into the data section but "hardcoded" and push on the stackframe like this:
.text:00401FA2 mov dword ptr [ebp-104h], 1
.text:00401FAC mov dword ptr [ebp-100h], 7
.text:00401FB6 mov dword ptr [ebp-0FCh], 4554494Ch ; 4C49544552414C = "LITERAL"
.text:00401FC0 mov word ptr [ebp-0F8h], 4152h
.text:00401FC9 mov byte ptr [ebp-0F6h], 4Ch
if not aliased the constant is put into the data section.
- Rom B.
next prev parent reply other threads:[~2013-01-30 22:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-30 0:44 Ada and string literals codeallergy
2013-01-30 7:08 ` Niklas Holsti
2013-01-30 11:50 ` Mart van de Wege
2013-01-30 13:52 ` Niklas Holsti
2013-01-30 16:09 ` Adam Beneschan
2013-02-01 0:54 ` Shark8
2013-02-01 9:03 ` Niklas Holsti
2013-02-01 14:58 ` Shark8
2013-01-30 16:52 ` codeallergy
2013-01-30 17:19 ` Adam Beneschan
2013-01-30 20:02 ` Simon Wright
2013-01-30 20:19 ` Georg Bauhaus
2013-01-30 22:06 ` Robert A Duff
2013-01-30 22:10 ` Jeffrey Carter
2013-01-31 2:23 ` Robert A Duff
2013-01-31 15:49 ` Adam Beneschan
2013-01-31 22:24 ` Robert A Duff
2013-02-01 21:16 ` gautier_niouzes
2013-02-02 1:55 ` Stephen Leake
2013-02-02 14:30 ` Robert A Duff
2013-01-31 9:20 ` ake.ragnar.dahlgren
2013-01-30 16:20 ` Robert A Duff
2013-02-01 13:20 ` Stephen Leake
2013-02-01 14:49 ` Robert A Duff
2013-02-01 17:23 ` Dmitry A. Kazakov
2013-02-01 20:22 ` Robert A Duff
2013-02-01 22:03 ` Dmitry A. Kazakov
2013-01-30 22:54 ` codeallergy [this message]
2013-02-01 0:50 ` Shark8
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