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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2013-10-29 13:44:11 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2013-10-29 13:44:11 +0000 |
| commit | 1313a223ed2e8d41b6a13d3738123042b5573b88 (patch) | |
| tree | e81c14439139e91868828cfd8d252acdc8f58098 /docs | |
| parent | 45d2e6492c48d41267f2d7576028422554c9875e (diff) | |
| download | external_llvm-1313a223ed2e8d41b6a13d3738123042b5573b88.zip external_llvm-1313a223ed2e8d41b6a13d3738123042b5573b88.tar.gz external_llvm-1313a223ed2e8d41b6a13d3738123042b5573b88.tar.bz2 | |
Clarify that GlobalVariables definitions must have an initializer.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193609 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.rst | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 6bf141e..965858c 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -445,9 +445,13 @@ Global Variables ---------------- Global variables define regions of memory allocated at compilation time -instead of run-time. Global variables may optionally be initialized, may -have an explicit section to be placed in, and may have an optional -explicit alignment specified. +instead of run-time. + +Global variables definitions must be initialized, may have an explicit section +to be placed in, and may have an optional explicit alignment specified. + +Global variables in other translation units can also be declared, in which +case they don't have an initializer. A variable may be defined as ``thread_local``, which means that it will not be shared by threads (each thread will have a separated copy of the @@ -529,6 +533,12 @@ with an initializer, section, and alignment: @G = addrspace(5) constant float 1.0, section "foo", align 4 +The following example just declares a global variable + +.. code-block:: llvm + + @G = external global i32 + The following example defines a thread-local global with the ``initialexec`` TLS model: |