Move all decls in coverage namespace into CoverageMapping.h/NFC

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

diff --git a/docs/BitCodeFormat.rst b/docs/BitCodeFormat.rst
index 86436ff6334b934f3cf212f4dc5deb0f41aea0bd..d6e3099bdb63d8d620050f9c90916ad97a2511dd 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, dllstorageclass]``
+``[GLOBALVAR, pointer type, isconst, initid, linkage, alignment, section, visibility, threadlocal, unnamed_addr, externally_initialized, dllstorageclass, comdat]``

 
 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:


@@ -714,7 +728,7 @@ 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``
 

-.. _dllstorageclass:
+.. _bcdllstorageclass:

 
 * *dllstorageclass*: If present, an encoding of the DLL storage class of this variable:
 
 
 * *dllstorageclass*: If present, an encoding of the DLL storage class of this variable:
 


@@ -727,7 +741,7 @@ global variable. The operand fields are:
 MODULE_CODE_FUNCTION Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 MODULE_CODE_FUNCTION Record
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

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

 
 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:


@@ -742,13 +756,12 @@ function. The operand fields are:
   * ``anyregcc``: code 13
   * ``preserve_mostcc``: code 14
   * ``preserve_allcc``: code 15
   * ``anyregcc``: code 13
   * ``preserve_mostcc``: code 14
   * ``preserve_allcc``: code 15

+  * ``cxx_fast_tlscc``: code 17

   * ``x86_stdcallcc``: code 64
   * ``x86_fastcallcc``: code 65
   * ``arm_apcscc``: code 66
   * ``arm_aapcscc``: code 67
   * ``arm_aapcs_vfpcc``: code 68
   * ``x86_stdcallcc``: code 64
   * ``x86_fastcallcc``: code 65
   * ``arm_apcscc``: code 66
   * ``arm_aapcscc``: code 67
   * ``arm_aapcs_vfpcc``: code 68

-  * ``x86_thiscallcc``: code 70
-  * ``x86_cdeclmethodcc``: code 80

 
 * isproto*: Non-zero if this entry represents a declaration rather than a
   definition
 
 * isproto*: Non-zero if this entry represents a declaration rather than a
   definition


@@ -772,10 +785,19 @@ function. The operand fields are:
 * *unnamed_addr*: If present and non-zero, indicates that the function has
   ``unnamed_addr``
 
 * *unnamed_addr*: If present and non-zero, indicates that the function has
   ``unnamed_addr``
 

-* *prefix*: If non-zero, the value index of the prefix data for this function,
+* *prologuedata*: If non-zero, the value index of the prologue data for this function,

   plus 1.
 
   plus 1.
 

-* *dllstorageclass*: An encoding of the `dllstorageclass`_ of this function
+* *dllstorageclass*: An encoding of the
+  :ref:`dllstorageclass<bcdllstorageclass>` of this function
+
+* *comdat*: An encoding of the COMDAT of this function
+
+* *prefixdata*: If non-zero, the value index of the prefix data for this function,
+  plus 1.
+
+* *personalityfn*: If non-zero, the value index of the personality function for this function,
+  plus 1.

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


@@ -793,7 +815,8 @@ 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 `dllstorageclass`_ of the alias
+* *dllstorageclass*: If present, an encoding of the
+  :ref:`dllstorageclass<bcdllstorageclass>` of the alias

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


@@ -829,7 +852,7 @@ in the *paramattr* field of module block `FUNCTION`_ records, or within the
 *attr* field of function block ``INST_INVOKE`` and ``INST_CALL`` records.
 
 Entries within ``PARAMATTR_BLOCK`` are constructed to ensure that each is unique
 *attr* field of function block ``INST_INVOKE`` and ``INST_CALL`` records.
 
 Entries within ``PARAMATTR_BLOCK`` are constructed to ensure that each is unique

-(i.e., no two indicies represent equivalent attribute lists).
+(i.e., no two indices represent equivalent attribute lists).

 
 .. _PARAMATTR_CODE_ENTRY:
 
 
 .. _PARAMATTR_CODE_ENTRY:
 


@@ -882,7 +905,7 @@ table entry, which may be referenced by 0-based index from instructions,
 constants, metadata, type symbol table entries, or other type operator records.
 
 Entries within ``TYPE_BLOCK`` are constructed to ensure that each entry is
 constants, metadata, type symbol table entries, or other type operator records.
 
 Entries within ``TYPE_BLOCK`` are constructed to ensure that each entry is

-unique (i.e., no two indicies represent structurally equivalent types).
+unique (i.e., no two indices represent structurally equivalent types).

 
 .. _TYPE_CODE_NUMENTRY:
 .. _NUMENTRY:
 
 .. _TYPE_CODE_NUMENTRY:
 .. _NUMENTRY: