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Decouple dllexport/dllimport from linkage

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Representing dllexport/dllimport as distinct linkage types prevents using
these attributes on templates and inline functions.

Instead of introducing further mixed linkage types to include linkonce and
weak ODR, the old import/export linkage types are replaced with a new
separate visibility-like specifier:

  define available_externally dllimport void @f() {}
  @Var = dllexport global i32 1, align 4

Linkage for dllexported globals and functions is now equal to their linkage
without dllexport. Imported globals and functions must be either
declarations with external linkage, or definitions with
AvailableExternallyLinkage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199204 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nico Rieck
2014-01-14 11:55:03 +00:00
parent 1b1321f080
commit bce07a0c3b
27 changed files with 547 additions and 157 deletions
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docs/BitCodeFormat.rst
+15 -3
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@@ -658,7 +658,7 @@ for each library name referenced.
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:
@@ -713,12 +713,20 @@ global variable. The operand fields are:
* *unnamed_addr*: If present and non-zero, indicates that the variable has
``unnamed_addr``
.. _dllstorageclass:
* *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, 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:
@@ -762,10 +770,12 @@ function. The operand fields are:
* *prefix*: If non-zero, the value index of the prefix data for this function,
plus 1.
* *dllstorageclass*: An encoding of the `dllstorageclass`_ of this function
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
@@ -778,6 +788,8 @@ fields are
* *visibility*: If present, an encoding of the `visibility`_ of the alias
* *dllstorageclass*: If present, an encoding of the `dllstorageclass`_ of the alias
MODULE_CODE_PURGEVALS Record
^^^^^^^^^^^^^^^^^^^^^^^^^^^^