rust/src/libcore/stackwalk.rs

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// Copyright 2012 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.
#[doc(hidden)]; // FIXME #3538
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#[legacy_modes]; // tjc: remove after snapshot
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// NB: transitionary, de-mode-ing.
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// XXX: Can't forbid this because frame_address needs a deprecated mode.
#[allow(deprecated_mode)];
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#[forbid(deprecated_pattern)];
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use cast::reinterpret_cast;
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use ptr::offset;
use sys::size_of;
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pub type Word = uint;
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pub struct Frame {
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fp: *Word
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}
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pub fn Frame(fp: *Word) -> Frame {
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Frame {
fp: fp
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}
}
pub fn walk_stack(visit: fn(Frame) -> bool) {
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debug!("beginning stack walk");
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do frame_address |frame_pointer| {
let mut frame_address: *Word = unsafe {
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reinterpret_cast(&frame_pointer)
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};
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loop {
let fr = Frame(frame_address);
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debug!("frame: %x", unsafe { reinterpret_cast(&fr.fp) });
visit(fr);
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unsafe {
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let next_fp: **Word = reinterpret_cast(&frame_address);
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frame_address = *next_fp;
if *frame_address == 0u {
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debug!("encountered task_start_wrapper. ending walk");
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// This is the task_start_wrapper_frame. There is
// no stack beneath it and it is a foreign frame.
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break;
}
}
}
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}
}
#[test]
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fn test_simple() {
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for walk_stack |_frame| {
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}
}
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#[test]
fn test_simple_deep() {
fn run(i: int) {
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if i == 0 { return }
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for walk_stack |_frame| {
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unsafe {
breakpoint();
}
}
run(i - 1);
}
run(10);
}
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fn breakpoint() {
rustrt::rust_dbg_breakpoint()
}
fn frame_address(f: fn(++x: *u8)) {
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rusti::frame_address(f)
}
extern mod rustrt {
#[legacy_exports];
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fn rust_dbg_breakpoint();
}
#[abi = "rust-intrinsic"]
extern mod rusti {
#[legacy_exports];
fn frame_address(f: &once fn(++x: *u8));
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}