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authorMarti Bolivar <mbolivar@leaflabs.com>2012-06-29 13:46:39 -0400
committerMarti Bolivar <mbolivar@leaflabs.com>2012-06-29 13:46:39 -0400
commit777e11ddb03c94586bdbecdf0cbd26aed813ed62 (patch)
tree08ae252ffd28b7613064e049b63705e0d8263027 /source
parentd8634acf17979a63c6ce3b8a4c23a6a9041ab090 (diff)
downloadlibrambutan-777e11ddb03c94586bdbecdf0cbd26aed813ed62.tar.gz
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Update <libmaple/libmaple_types.h> page.
Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>
Diffstat (limited to 'source')
-rw-r--r--source/libmaple/api/libmaple_types.rst68
1 files changed, 55 insertions, 13 deletions
diff --git a/source/libmaple/api/libmaple_types.rst b/source/libmaple/api/libmaple_types.rst
index 7fed5dc..5ca446e 100644
--- a/source/libmaple/api/libmaple_types.rst
+++ b/source/libmaple/api/libmaple_types.rst
@@ -1,12 +1,15 @@
.. highlight:: c
.. _libmaple-libmaple_types:
-``libmaple_types.h``
-====================
+``<libmaple/libmaple_types.h>``
+===============================
Defines the base types and type-related macros used throughout the
rest of libmaple.
+.. contents:: Contents
+ :local:
+
Integral Types
--------------
@@ -22,22 +25,61 @@ Integral Types
Attributes and Type Qualifiers
------------------------------
+In the case of macros for GCC's ``__attribute__``\ s, we have our own
+macros mostly to save typing, but also in hopes that they might be
+expressible using different compiler extensions, or to give them
+different interpretations when running e.g. Doxygen on libmaple.
+
+.. c:macro:: __always_inline
+
+ Macro for ``inline __attribute__((always_inline))``. This can be
+ used to defeat GCC's ``-Os`` when you Really Mean Inline.
+
+.. c:macro:: __attr_flash
+
+ Macro for a GCC ``__attribute__`` which (when using libmaple's
+ linker scripts) will cause the variable being marked to be stored
+ in Flash, rather than SRAM. It's useful for read-only variables
+ like look-up tables.
+
+.. c:macro:: __deprecated
+
+ Macro for ``__attribute__((deprecated))``. Its use causes GCC to
+ emit deprecation warnings when the deprecated functionality is
+ used. It's not used for everything that gets deprecated, so don't
+ rely on it to catch all uses of deprecated APIs.
+
+.. c:macro:: __packed
+
+ Macro for ``__attribute__((packed))``.
+
.. c:macro:: __io
- This is a macro for ``volatile`` which is used to denote that the
- variable whose type is being qualified is IO-mapped. Its most
- common use is in the individual members of each :ref:`register map
+ Macro for ``volatile`` which denotes that the variable whose type
+ is being qualified is IO-mapped. Its most common use is in the
+ individual members of each :ref:`register map
<libmaple-overview-regmaps>` struct.
-.. c:macro:: __attr_flash
+.. c:macro:: __weak
- This is a macro for a GCC ``__attribute__`` which (when using the
- linker scripts provided with libmaple) will cause the variable
- being marked to be stored in Flash, rather than SRAM. The
- variable's value may be read like that of any other variable, but
- it may not be written.
+ Macro for ``__attribute__((weak))``.
-Other typedefs
---------------
+.. c:macro:: __unused
+
+ Macro for ``__attribute__((unused))``. This can be used
+ (sparingly!) to silence unused function warnings when GCC is
+ mistaken.
+
+Miscellaneous
+-------------
.. doxygentypedef:: voidFuncPtr
+
+.. c:macro:: offsetof(type, member)
+
+ If left undefined, this is defined to ``__builtin_ofsetof(type,
+ member)``.
+
+.. c:macro:: NULL
+
+ If left undefined, this is defined to ``0``.