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Skip an extra trip through filesystem on the critical path

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This commit is contained in:
David Tolnay 2023-07-26 00:58:34 -07:00
parent d2d7bad04a
commit 78a11a27b6
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 15 additions and 9 deletions
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20
precompiled/serde_derive/src/lib_precompiled.rs
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@ -6,7 +6,7 @@ mod bytecode;
use crate::buffer::{InputBuffer, OutputBuffer};
use crate::bytecode::Bytecode;
use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
use std::io::{Read, Write};
use std::io::{ErrorKind, Read, Write};
use std::iter::FromIterator;
use std::path::Path;
use std::process::{Command, ExitStatus, Stdio};
@ -36,17 +36,23 @@ fn derive(select: u8, input: TokenStream) -> TokenStream {
env!("CARGO_MANIFEST_DIR"),
"/serde_derive-x86_64-unknown-linux-gnu",
));
if !exe_path.exists() {
let mut child = match Command::new(exe_path)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
{
Ok(child) => child,
Err(io_error) => {
if io_error.kind() == ErrorKind::NotFound {
panic!(
"file missing from serde_derive manifest directory during macro expansion: {}",
exe_path.display(),
);
} else {
panic!("failed to spawn process: {}", io_error);
}
let mut child = Command::new(exe_path)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.spawn()
.expect("failed to spawn process");
}
};
let mut stdin = child.stdin.take().unwrap();
let mut buf = buf.into_bytes();