diff options
Diffstat (limited to 'gcc/c-common.c')
| -rw-r--r-- | gcc/c-common.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/gcc/c-common.c b/gcc/c-common.c index 5e5bbad319d..c3dc4ea6359 100644 --- a/gcc/c-common.c +++ b/gcc/c-common.c @@ -4600,6 +4600,42 @@ handle_visibility_attribute (tree *node, tree name, tree args, return NULL_TREE; } +/* Determine the ELF symbol visibility for DECL, which is either a + variable or a function. It is an error to use this function if a + definition of DECL is not available in this translation unit. + Returns true if the final visibility has been determined by this + function; false if the caller is free to make additional + modifications. */ + +bool +c_determine_visibility (tree decl) +{ + my_friendly_assert (TREE_CODE (decl) == VAR_DECL + || TREE_CODE (decl) == FUNCTION_DECL, + 20040805); + + /* If the user explicitly specified the visibility with an + attribute, honor that. DECL_VISIBILITY will have been set during + the processing of the attribute. We check for an explicit + attribute, rather than just checking DECL_VISIBILITY_SPECIFIED, + to distinguish the use of an attribute from the use of a "#pragma + GCC visibility push(...)"; in the latter case we still want other + considerations to be able to overrule the #pragma. */ + if (lookup_attribute ("visibility", DECL_ATTRIBUTES (decl))) + return true; + + /* Anything that is exported must have default visibility. */ + if (TARGET_DLLIMPORT_DECL_ATTRIBUTES + && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl))) + { + DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; + DECL_VISIBILITY_SPECIFIED (decl) = 1; + return true; + } + + return false; +} + /* Handle an "tls_model" attribute; arguments as in struct attribute_spec.handler. */ |
