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Diffstat (limited to 'src/rt/rust_try.ll')
| -rw-r--r-- | src/rt/rust_try.ll | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/rt/rust_try.ll b/src/rt/rust_try.ll new file mode 100644 index 00000000000..c912aa789bf --- /dev/null +++ b/src/rt/rust_try.ll @@ -0,0 +1,34 @@ +; Copyright 2013 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. + +; Rust's try-catch +; When f(...) returns normally, the return value is null. +; When f(...) throws, the return value is a pointer to the caught exception object. +; See also: libstd/rt/unwind.rs + +define i8* @rust_try(void (i8*,i8*)* %f, i8* %fptr, i8* %env) { + + invoke void %f(i8* %fptr, i8* %env) + to label %normal + unwind label %catch + +normal: + ret i8* null + +catch: + %1 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @rust_eh_personality_catch to i8*) + catch i8* null ; catch everything + + ; extract and return pointer to the exception object + %2 = extractvalue { i8*, i32 } %1, 0 + ret i8* %2 +} + +declare i32 @rust_eh_personality_catch(...) |