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rust/src/test/codegen/external-no-mangle-statics.rs

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Upgrade Emscripten targets to use upstream LLVM backend - Compatible with Emscripten 1.38.46-upstream or later upstream. - Refactors the Emscripten target spec to share code with other wasm targets. - Replaces the old incorrect wasm32 C call ABI with the correct one, preserving the old one as wasm32_bindgen_compat for wasm-bindgen compatibility. - Updates the varargs ABI used by Emscripten and deletes the old one. - Removes the obsolete wasm32-experimental-emscripten target. - Uses EMCC_CFLAGS on CI to avoid the timeout problems with #63649.
2019-08-17 00:08:01 -05:00
// ignore-emscripten default visibility is hidden
rustc: Allow `#[no_mangle]` anywhere in a crate This commit updates the compiler to allow the `#[no_mangle]` (and `#[export_name]` attributes) to be located anywhere within a crate. These attributes are unconditionally processed, causing the compiler to always generate an exported symbol with the appropriate name. After some discussion on #54135 it was found that not a great reason this hasn't been allowed already, and it seems to match the behavior that many expect! Previously the compiler would only export a `#[no_mangle]` symbol if it were *publicly reachable*, meaning that it itself is `pub` and it's otherwise publicly reachable from the root of the crate. This new definition is that `#[no_mangle]` *is always reachable*, no matter where it is in a crate or whether it has `pub` or not. This should make it much easier to declare an exported symbol with a known and unique name, even when it's an internal implementation detail of the crate itself. Note that these symbols will persist beyond LTO as well, always making their way to the linker. Along the way this commit removes the `private_no_mangle_functions` lint (also for statics) as there's no longer any need to lint these situations. Furthermore a good number of tests were updated now that symbol visibility has been changed. Closes #54135
2018-09-21 17:58:11 -05:00
// compile-flags: -O
Various minor/cosmetic improvements to code
2018-11-26 20:59:49 -06:00
// `#[no_mangle]`d static variables always have external linkage, i.e., no `internal` in their
rustc: Allow `#[no_mangle]` anywhere in a crate This commit updates the compiler to allow the `#[no_mangle]` (and `#[export_name]` attributes) to be located anywhere within a crate. These attributes are unconditionally processed, causing the compiler to always generate an exported symbol with the appropriate name. After some discussion on #54135 it was found that not a great reason this hasn't been allowed already, and it seems to match the behavior that many expect! Previously the compiler would only export a `#[no_mangle]` symbol if it were *publicly reachable*, meaning that it itself is `pub` and it's otherwise publicly reachable from the root of the crate. This new definition is that `#[no_mangle]` *is always reachable*, no matter where it is in a crate or whether it has `pub` or not. This should make it much easier to declare an exported symbol with a known and unique name, even when it's an internal implementation detail of the crate itself. Note that these symbols will persist beyond LTO as well, always making their way to the linker. Along the way this commit removes the `private_no_mangle_functions` lint (also for statics) as there's no longer any need to lint these situations. Furthermore a good number of tests were updated now that symbol visibility has been changed. Closes #54135
2018-09-21 17:58:11 -05:00
// definitions
#![crate_type = "lib"]
#![no_std]
// CHECK: @A = local_unnamed_addr constant
#[no_mangle]
static A: u8 = 0;
// CHECK: @B = local_unnamed_addr global
#[no_mangle]
static mut B: u8 = 0;
// CHECK: @C = local_unnamed_addr constant
#[no_mangle]
pub static C: u8 = 0;
// CHECK: @D = local_unnamed_addr global
#[no_mangle]
pub static mut D: u8 = 0;
mod private {
// CHECK: @E = local_unnamed_addr constant
#[no_mangle]
static E: u8 = 0;
// CHECK: @F = local_unnamed_addr global
#[no_mangle]
static mut F: u8 = 0;
// CHECK: @G = local_unnamed_addr constant
#[no_mangle]
pub static G: u8 = 0;
// CHECK: @H = local_unnamed_addr global
#[no_mangle]
pub static mut H: u8 = 0;
}
const HIDDEN: () = {
// CHECK: @I = local_unnamed_addr constant
#[no_mangle]
static I: u8 = 0;
// CHECK: @J = local_unnamed_addr global
#[no_mangle]
static mut J: u8 = 0;
// CHECK: @K = local_unnamed_addr constant
#[no_mangle]
pub static K: u8 = 0;
// CHECK: @L = local_unnamed_addr global
#[no_mangle]
pub static mut L: u8 = 0;
};
fn x() {
// CHECK: @M = local_unnamed_addr constant
#[no_mangle]
static M: fn() = x;
// CHECK: @N = local_unnamed_addr global
#[no_mangle]
static mut N: u8 = 0;
// CHECK: @O = local_unnamed_addr constant
#[no_mangle]
pub static O: u8 = 0;
// CHECK: @P = local_unnamed_addr global
#[no_mangle]
pub static mut P: u8 = 0;
}
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