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minor: Break out of waiting for debugger on Windows using native debugger check API.

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For Windows, this removes the need to add a breakpoint and modify a value to exit the debugger wait loop.

As a ridealong, this adds a 100ms sleep for all platforms such that waiting for the debugger doesn't hog the CPU thread.
This commit is contained in:
Nicholas Rishel 2024-12-23 14:23:01 -08:00
parent 0a706f7d2a
commit f8f7d37b8b
2 changed files with 25 additions and 7 deletions
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2
crates/rust-analyzer/Cargo.toml
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@ -75,7 +75,7 @@ vfs.workspace = true
paths.workspace = true
[target.'cfg(windows)'.dependencies]
windows-sys = { version = "0.52", features = ["Win32_System_Threading"] }
windows-sys = { version = "0.52", features = ["Win32_System_Diagnostics_Debug", "Win32_System_Threading"] }
[target.'cfg(not(target_env = "msvc"))'.dependencies]
jemallocator = { version = "0.5.0", package = "tikv-jemallocator", optional = true }

30
crates/rust-analyzer/src/bin/main.rs
View file

@ -10,7 +10,7 @@ extern crate rustc_driver as _;
mod rustc_wrapper;
use std::{env, fs, path::PathBuf, process::ExitCode, sync::Arc};
use std::{env, fs, path::PathBuf, process::ExitCode, sync::Arc, thread::sleep};
use anyhow::Context;
use lsp_server::Connection;
@ -44,11 +44,7 @@ fn actual_main() -> anyhow::Result<ExitCode> {
#[cfg(debug_assertions)]
if flags.wait_dbg || env::var("RA_WAIT_DBG").is_ok() {
#[allow(unused_mut)]
let mut d = 4;
while d == 4 {
d = 4;
}
wait_for_debugger();
}
if let Err(e) = setup_logging(flags.log_file.clone()) {
@ -96,6 +92,28 @@ fn actual_main() -> anyhow::Result<ExitCode> {
Ok(ExitCode::SUCCESS)
}
#[cfg(debug_assertions)]
fn wait_for_debugger() {
#[cfg(target_os = "windows")]
{
use windows_sys::Win32::System::Diagnostics::Debug::IsDebuggerPresent;
// SAFETY: WinAPI generated code that is defensively marked `unsafe` but
// in practice can not be used in an unsafe way.
while unsafe { IsDebuggerPresent() } == 0 {
sleep(std::time::Duration::from_millis(100));
}
}
#[cfg(not(target_os = "windows"))]
{
#[allow(unused_mut)]
let mut d = 4;
while d == 4 {
d = 4;
sleep(std::time::Duration::from_millis(100));
}
}
}
fn setup_logging(log_file_flag: Option<PathBuf>) -> anyhow::Result<()> {
if cfg!(windows) {
// This is required so that windows finds our pdb that is placed right beside the exe.