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Add link_section attribute for static and fn items

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This allows for control over the section placement of static, static
mut, and fn items.  One caveat is that if a static and a static mut are
placed in the same section, the static is declared first, and the static
mut is assigned to, the generated program crashes.  For example:

#[link_section=".boot"]
static foo : uint = 0xdeadbeef;

#[link_section=".boot"]
static mut bar : uint = 0xcafebabe;

Declaring bar first would mark .bootdata as writable, preventing the
crash when bar is written to.
This commit is contained in:
Kevin Murphy 2013-07-22 22:34:04 -04:00
parent 74f4badcab
commit 64ff30a4f0
1 changed files with 10 additions and 1 deletions
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11
src/librustc/middle/trans/base.rs
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@ -2456,7 +2456,7 @@ pub fn get_item_val(ccx: @mut CrateContext, id: ast::node_id) -> ValueRef {
let val = match item {
ast_map::node_item(i, pth) => {
let my_path = vec::append((*pth).clone(), [path_name(i.ident)]);
match i.node {
let v = match i.node {
ast::item_static(_, m, expr) => {
let typ = ty::node_id_to_type(ccx.tcx, i.id);
let s = mangle_exported_name(ccx, my_path, typ);
@ -2488,7 +2488,16 @@ pub fn get_item_val(ccx: @mut CrateContext, id: ast::node_id) -> ValueRef {
llfn
}
_ => fail!("get_item_val: weird result in table")
};
match (attr::first_attr_value_str_by_name(i.attrs, "link_section")) {
Some(sect) => unsafe {
do sect.as_c_str |buf| {
llvm::LLVMSetSection(v, buf);
}
},
None => ()
}
v
}
ast_map::node_trait_method(trait_method, _, pth) => {
debug!("get_item_val(): processing a node_trait_method");