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'pure' is now 'noStackFrame' for procs

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Araq 2011-08-19 19:11:58 +02:00
commit 5cba831c88
6 changed files with 28 additions and 21 deletions
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19
doc/manual.txt
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@ -1853,7 +1853,7 @@ Nimrod identifiers shall be enclosed in a special character which can be
specified in the statement's pragmas. The default special character is ``'`'``:
.. code-block:: nimrod
proc addInt(a, b: int): int {.pure.} =
proc addInt(a, b: int): int {.noStackFrame.} =
# a in eax, and b in edx
asm """
mov eax, `a`
@ -2900,12 +2900,17 @@ structure:
Pure pragma
-----------
The `pure`:idx: pragma serves two completely different purposes:
1. To mark a procedure that Nimrod should not generate any exit statements like
``return result;`` in the generated code. This is useful for procs that only
consist of an assembler statement.
2. To mark an object type so that its type field should be omitted. This is
necessary for binary compatibility with other compiled languages.
An object type can be marked with the `pure`:idx: pragma so that its type
field which is used for runtime type identification is omitted. This is
necessary for binary compatibility with other compiled languages.
NoStackFrame pragma
-------------------
A proc can be marked with the `noStackFrame`:idx: pragma to tell the compiler
it should not generate a stack frame for the proc. There are also no exit
statements like ``return result;`` generated. This is useful for procs that
only consist of an assembler statement.
error pragma