DI: Fold constant arguments into a single MDString

[oota-llvm.git] / docs / BitCodeFormat.rst

diff --git a/docs/BitCodeFormat.rst b/docs/BitCodeFormat.rst
index 89531dcfea69a39ff1315c6e3003cae501d71439..34485b538c54861fda1611c4e763089bfb2ebc28 100644 (file)
--- a/docs/BitCodeFormat.rst
+++ b/docs/BitCodeFormat.rst
@@ -28,8 +28,9 @@ Unlike XML, the bitstream format is a binary encoding, and unlike XML it
 provides a mechanism for the file to self-describe "abbreviations", which are
 effectively size optimizations for the content.
 
 provides a mechanism for the file to self-describe "abbreviations", which are
 effectively size optimizations for the content.
 

-LLVM IR files may be optionally embedded into a `wrapper`_ structure that makes
-it easy to embed extra data along with LLVM IR files.
+LLVM IR files may be optionally embedded into a `wrapper`_ structure, or in a
+`native object file`_. Both of these mechanisms make it easy to embed extra
+data along with LLVM IR files.

 
 This document first describes the LLVM bitstream format, describes the wrapper
 format, then describes the record structure used by LLVM IR files.
 
 This document first describes the LLVM bitstream format, describes the wrapper
 format, then describes the record structure used by LLVM IR files.


@@ -460,6 +461,19 @@ to the start of the bitcode stream in the file, and the Size field is the size
 in bytes of the stream. CPUType is a target-specific value that can be used to
 encode the CPU of the target.
 
 in bytes of the stream. CPUType is a target-specific value that can be used to
 encode the CPU of the target.
 

+.. _native object file:
+
+Native Object File Wrapper Format
+=================================
+
+Bitcode files for LLVM IR may also be wrapped in a native object file
+(i.e. ELF, COFF, Mach-O).  The bitcode must be stored in a section of the
+object file named ``.llvmbc``.  This wrapper format is useful for accommodating
+LTO in compilation pipelines where intermediate objects must be native object
+files which contain metadata in other sections.
+
+Not all tools support this format.
+

 .. _encoding of LLVM IR:
 
 LLVM IR Encoding
 .. _encoding of LLVM IR:
 
 LLVM IR Encoding


@@ -658,7 +672,7 @@ for each library name referenced.
 MODULE_CODE_GLOBALVAR Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 MODULE_CODE_GLOBALVAR Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

-``[GLOBALVAR, pointer type, isconst, initid, linkage, alignment, section, visibility, threadlocal, unnamed_addr]``
+``[GLOBALVAR, pointer type, isconst, initid, linkage, alignment, section, visibility, threadlocal, unnamed_addr, dllstorageclass]``

 
 The ``GLOBALVAR`` record (code 7) marks the declaration or definition of a
 global variable. The operand fields are:
 
 The ``GLOBALVAR`` record (code 7) marks the declaration or definition of a
 global variable. The operand fields are:


@@ -688,7 +702,8 @@ global variable. The operand fields are:
   * ``weak_odr``: code 10
   * ``linkonce_odr``: code 11
   * ``available_externally``: code 12
   * ``weak_odr``: code 10
   * ``linkonce_odr``: code 11
   * ``available_externally``: code 12

-  * ``linker_private``: code 13
+  * deprecated : code 13
+  * deprecated : code 14

 
 * alignment*: The logarithm base 2 of the variable's requested alignment, plus 1
 
 
 * alignment*: The logarithm base 2 of the variable's requested alignment, plus 1
 


@@ -713,12 +728,20 @@ global variable. The operand fields are:
 * *unnamed_addr*: If present and non-zero, indicates that the variable has
   ``unnamed_addr``
 
 * *unnamed_addr*: If present and non-zero, indicates that the variable has
   ``unnamed_addr``
 

+.. _bcdllstorageclass:
+
+* *dllstorageclass*: If present, an encoding of the DLL storage class of this variable:
+
+  * ``default``: code 0
+  * ``dllimport``: code 1
+  * ``dllexport``: code 2
+

 .. _FUNCTION:
 
 MODULE_CODE_FUNCTION Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 .. _FUNCTION:
 
 MODULE_CODE_FUNCTION Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

-``[FUNCTION, type, callingconv, isproto, linkage, paramattr, alignment, section, visibility, gc, prefix]``
+``[FUNCTION, type, callingconv, isproto, linkage, paramattr, alignment, section, visibility, gc, prefix, dllstorageclass]``

 
 The ``FUNCTION`` record (code 8) marks the declaration or definition of a
 function. The operand fields are:
 
 The ``FUNCTION`` record (code 8) marks the declaration or definition of a
 function. The operand fields are:


@@ -731,6 +754,8 @@ function. The operand fields are:
   * ``coldcc``: code 9
   * ``webkit_jscc``: code 12
   * ``anyregcc``: code 13
   * ``coldcc``: code 9
   * ``webkit_jscc``: code 12
   * ``anyregcc``: code 13

+  * ``preserve_mostcc``: code 14
+  * ``preserve_allcc``: code 15

   * ``x86_stdcallcc``: code 64
   * ``x86_fastcallcc``: code 65
   * ``arm_apcscc``: code 66
   * ``x86_stdcallcc``: code 64
   * ``x86_fastcallcc``: code 65
   * ``arm_apcscc``: code 66


@@ -762,10 +787,13 @@ function. The operand fields are:
 * *prefix*: If non-zero, the value index of the prefix data for this function,
   plus 1.
 
 * *prefix*: If non-zero, the value index of the prefix data for this function,
   plus 1.
 

+* *dllstorageclass*: An encoding of the
+  :ref:`dllstorageclass<bcdllstorageclass>` of this function
+

 MODULE_CODE_ALIAS Record
 ^^^^^^^^^^^^^^^^^^^^^^^^
 
 MODULE_CODE_ALIAS Record
 ^^^^^^^^^^^^^^^^^^^^^^^^
 

-``[ALIAS, alias type, aliasee val#, linkage, visibility]``
+``[ALIAS, alias type, aliasee val#, linkage, visibility, dllstorageclass]``

 
 The ``ALIAS`` record (code 9) marks the definition of an alias. The operand
 fields are
 
 The ``ALIAS`` record (code 9) marks the definition of an alias. The operand
 fields are


@@ -778,6 +806,9 @@ fields are
 
 * *visibility*: If present, an encoding of the `visibility`_ of the alias
 
 
 * *visibility*: If present, an encoding of the `visibility`_ of the alias
 

+* *dllstorageclass*: If present, an encoding of the
+  :ref:`dllstorageclass<bcdllstorageclass>` of the alias
+

 MODULE_CODE_PURGEVALS Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 MODULE_CODE_PURGEVALS Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 


@@ -1078,7 +1109,7 @@ named type.
 VALUE_SYMTAB_BLOCK Contents
 ---------------------------
 
 VALUE_SYMTAB_BLOCK Contents
 ---------------------------
 

-The ``VALUE_SYMTAB_BLOCK`` block (id 14) ... 
+The ``VALUE_SYMTAB_BLOCK`` block (id 14) ...

 
 .. _METADATA_BLOCK:
 
 
 .. _METADATA_BLOCK: