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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2013-06-11 13:18:13 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2013-06-11 13:18:13 +0000 |
| commit | 9f8e6da019a99960af59c79e17659dd2dba8433e (patch) | |
| tree | 0981ff97bfa7fed1ddde2d439eb1b5d93e13b1d3 /docs | |
| parent | 6c921a55f4d5fc51a127fcc673ac1c9b46273899 (diff) | |
| download | llvm-9f8e6da019a99960af59c79e17659dd2dba8433e.tar.gz llvm-9f8e6da019a99960af59c79e17659dd2dba8433e.tar.bz2 llvm-9f8e6da019a99960af59c79e17659dd2dba8433e.tar.xz | |
Require members of llvm.used to be named.
The effect of llvm.used is to introduce an invisible reference, so this seems
a reasonable restriction. It will be used to provide an easy ordering of
the entries in llvm.used.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183743 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.rst | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 949dc4a876..2c55d333a6 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -2932,8 +2932,8 @@ The '``llvm.used``' Global Variable The ``@llvm.used`` global is an array which has :ref:`appending linkage <linkage_appending>`. This array contains a list of -pointers to global variables, functions and aliases which may optionally have a -pointer cast formed of bitcast or getelementptr. For example, a legal +pointers to named global variables, functions and aliases which may optionally +have a pointer cast formed of bitcast or getelementptr. For example, a legal use of it is: .. code-block:: llvm @@ -2948,11 +2948,11 @@ use of it is: If a symbol appears in the ``@llvm.used`` list, then the compiler, assembler, and linker are required to treat the symbol as if there is a reference to the -symbol that it cannot see. For example, if a variable has internal linkage and -no references other than that from the ``@llvm.used`` list, it cannot be -deleted. This is commonly used to represent references from inline asms and -other things the compiler cannot "see", and corresponds to -"``attribute((used))``" in GNU C. +symbol that it cannot see (which is why they have to be named). For example, if +a variable has internal linkage and no references other than that from the +``@llvm.used`` list, it cannot be deleted. This is commonly used to represent +references from inline asms and other things the compiler cannot "see", and +corresponds to "``attribute((used))``" in GNU C. On some targets, the code generator must emit a directive to the assembler or object file to prevent the assembler and linker from |