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Adding some very nascent information about the clang tablegen backends, with a promise to add more information later.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204635 91177308-0d34-0410-b5e6-96231b3b80d8
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Aaron Ballman 2014-03-24 18:18:31 +00:00
parent 47eac58333
commit 9f00cd9602
1 changed files with 49 additions and 17 deletions
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docs/TableGen/BackEnds.rst
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@ -234,72 +234,103 @@ Clang BackEnds
ClangAttrClasses
----------------
Generate clang attribute clases.
**Purpose**: Creates Attrs.inc, which contains semantic attribute class
declarations for any attribute in ``Attr.td`` that has not set ``ASTNode = 0``.
This file is included as part of ``Attr.h``.
ClangAttrParserStringSwitches
-----------------------------
Generate all parser-related attribute string switches.
**Purpose**: Creates AttrParserStringSwitches.inc, which contains
StringSwitch::Case statements for parser-related string switches. Each switch
is given its own macro (such as ``CLANG_ATTR_ARG_CONTEXT_LIST``, or
``CLANG_ATTR_IDENTIFIER_ARG_LIST``), which is expected to be defined before
including AttrParserStringSwitches.inc, and undefined after.
ClangAttrImpl
-------------
Generate clang attribute implementations.
**Purpose**: Creates AttrImpl.inc, which contains semantic attribute class
definitions for any attribute in ``Attr.td`` that has not set ``ASTNode = 0``.
This file is included as part of ``AttrImpl.cpp``.
ClangAttrList
-------------
Generate a clang attribute list.
**Purpose**: Creates AttrList.inc, which is used when a list of semantic
attribute identifiers is required. For instance, ``AttrKinds.h`` includes this
file to generate the list of ``attr::Kind`` enumeration values. This list is
separated out into multiple categories: attributes, inheritable attributes, and
inheritable parameter attributes. This categorization happens automatically
based on information in ``Attr.td`` and is used to implement the ``classof``
functionality required for ``dyn_cast`` and similar APIs.
ClangAttrPCHRead
----------------
Generate clang PCH attribute reader.
**Purpose**: Creates AttrPCHRead.inc, which is used to deserialize attributes
in the ``ASTReader::ReadAttributes`` function.
ClangAttrPCHWrite
-----------------
Generate clang PCH attribute writer.
**Purpose**: Creates AttrPCHWrite.inc, which is used to serialize attributes in
the ``ASTWriter::WriteAttributes`` function.
ClangAttrSpellingList
ClangAttrSpellings
---------------------
Generate a clang attribute spelling list.
**Purpose**: Creates AttrSpellings.inc, which is used to implement the
``__has_attribute`` feature test macro.
ClangAttrSpellingListIndex
--------------------------
Generate a clang attribute spelling index.
**Purpose**: Creates AttrSpellingListIndex.inc, which is used to map parsed
attribute spellings (including which syntax or scope was used) to an attribute
spelling list index. These spelling list index values are internal
implementation details exposed via
``AttributeList::getAttributeSpellingListIndex``.
ClangAttrASTVisitor
ClangAttrVisitor
-------------------
Generate a recursive AST visitor for clang attribute.
**Purpose**: Creates AttrVisitor.inc, which is used when implementing
recursive AST visitors.
ClangAttrTemplateInstantiate
----------------------------
Generate a clang template instantiate code.
**Purpose**: Creates AttrTemplateInstantiate.inc, which implements the
``instantiateTemplateAttribute`` function, used when instantiating a template
that requires an attribute to be cloned.
ClangAttrParsedAttrList
-----------------------
Generate a clang parsed attribute list.
**Purpose**: Creates AttrParsedAttrList.inc, which is used to generate the
``AttributeList::Kind`` parsed attribute enumeration.
ClangAttrParsedAttrImpl
-----------------------
Generate the clang parsed attribute helpers.
**Purpose**: Creates AttrParsedAttrImpl.inc, which is used by
``AttributeList.cpp`` to implement several functions on the ``AttributeList``
class. This functionality is implemented via the ``AttrInfoMap ParsedAttrInfo``
array, which contains one element per parsed attribute object.
ClangAttrParsedAttrKinds
------------------------
Generate a clang parsed attribute kinds.
**Purpose**: Creates AttrParsedAttrKinds.inc, which is used to implement the
``AttributeList::getKind`` function, mapping a string (and syntax) to a parsed
attribute ``AttributeList::Kind`` enumeration.
ClangAttrDump
-------------
Generate clang attribute dumper.
**Purpose**: Creates AttrDump.inc, which dumps information about an attribute.
It is used to implement ``ASTDumper::dumpAttr``.
ClangDiagsDefs
--------------
@ -379,7 +410,8 @@ Generate ARM NEON tests for clang.
AttrDocs
--------
Generate attribute documentation.
**Purpose**: Creates ``AttributeReference.rst`` from ``AttrDocs.td``, and is
used for documenting user-facing attributes.
How to write a back-end
=======================