#[stable(feature = "rust1", since = "1.0.0")]
pub fn transmute<T, U>(e: T) -> U;
- /// Gives the address for the return value of the enclosing function.
- ///
- /// Using this intrinsic in a function that does not use an out pointer
- /// will trigger a compiler error.
- pub fn return_address() -> *const u8;
-
/// Returns `true` if the actual type given as `T` requires drop
/// glue; returns `false` if the actual type provided for `T`
/// implements `Copy`.
register_long_diagnostics! {
-E0510: r##"
-`return_address` was used in an invalid context. Erroneous code example:
-
-```ignore
-#![feature(intrinsics)]
-
-extern "rust-intrinsic" {
- fn return_address() -> *const u8;
-}
-
-unsafe fn by_value() -> i32 {
- let _ = return_address();
- // error: invalid use of `return_address` intrinsic: function does
- // not use out pointer
- 0
-}
-```
-
-Return values may be stored in a return register(s) or written into a so-called
-out pointer. In case the returned value is too big (this is
-target-ABI-dependent and generally not portable or future proof) to fit into
-the return register(s), the compiler will return the value by writing it into
-space allocated in the caller's stack frame. Example:
-
-```
-#![feature(intrinsics)]
-
-extern "rust-intrinsic" {
- fn return_address() -> *const u8;
-}
-
-unsafe fn by_pointer() -> String {
- let _ = return_address();
- String::new() // ok!
-}
-```
-"##,
-
E0511: r##"
Invalid monomorphization of an intrinsic function was used. Erroneous code
example:
},
-
- (_, "return_address") => {
- if !fcx.fn_ty.ret.is_indirect() {
- span_err!(tcx.sess, span, E0510,
- "invalid use of `return_address` intrinsic: function \
- does not use out pointer");
- C_null(Type::i8p(ccx))
- } else {
- PointerCast(bcx, llvm::get_param(fcx.llfn, 0), Type::i8p(ccx))
- }
- }
-
(_, "discriminant_value") => {
let val_ty = substs.types.get(FnSpace, 0);
match val_ty.sty {
"fadd_fast" | "fsub_fast" | "fmul_fast" | "fdiv_fast" | "frem_fast" =>
(1, vec![param(ccx, 0), param(ccx, 0)], param(ccx, 0)),
- "return_address" => (0, vec![], tcx.mk_imm_ptr(tcx.types.u8)),
-
"assume" => (0, vec![tcx.types.bool], tcx.mk_nil()),
"discriminant_value" => (1, vec![
+++ /dev/null
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![allow(warnings)]
-#![feature(intrinsics)]
-
-extern "rust-intrinsic" {
- fn return_address() -> *const u8;
-}
-
-unsafe fn f() { let _ = return_address(); }
-//~^ ERROR invalid use of `return_address` intrinsic: function does not use out pointer
-
-unsafe fn g() -> isize { let _ = return_address(); 0 }
-//~^ ERROR invalid use of `return_address` intrinsic: function does not use out pointer
-
-fn main() {}
+++ /dev/null
-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-
-#![feature(intrinsics)]
-
-use std::ptr;
-
-struct Point {
- x: f32,
- y: f32,
- z: f32,
-}
-
-extern "rust-intrinsic" {
- fn return_address() -> *const u8;
-}
-
-fn f(result: &mut usize) -> Point {
- unsafe {
- *result = return_address() as usize;
- Point {
- x: 1.0,
- y: 2.0,
- z: 3.0,
- }
- }
-
-}
-
-fn main() {
- let mut intrinsic_reported_address = 0;
- let pt = f(&mut intrinsic_reported_address);
- let actual_address = &pt as *const Point as usize;
- assert_eq!(intrinsic_reported_address, actual_address);
-}