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Optimize RustcCodegenFlags #1305

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merged 6 commits into from
Dec 4, 2024
Merged

Optimize RustcCodegenFlags #1305

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69d615d
Optimize RustcCodegenFlags
NobodyXu Nov 28, 2024
0270aff
Fix lifetime annotations
NobodyXu Nov 28, 2024
0d0bc63
Fix compilation
NobodyXu Nov 28, 2024
8cdfe89
Fix lifetime in flags.rs
NobodyXu Nov 29, 2024
e598ec9
Fix compilation in flags.rs: Avoid allocation in prefix handling
NobodyXu Nov 29, 2024
9de7404
FIx cargo-fmt in flags.rs
NobodyXu Nov 29, 2024
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74 changes: 36 additions & 38 deletions src/flags.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,26 +5,26 @@ use std::ffi::OsString;
use std::path::Path;

#[derive(Debug, PartialEq, Default)]
pub(crate) struct RustcCodegenFlags {
branch_protection: Option<String>,
code_model: Option<String>,
pub(crate) struct RustcCodegenFlags<'a> {
branch_protection: Option<&'a str>,
code_model: Option<&'a str>,
no_vectorize_loops: bool,
no_vectorize_slp: bool,
profile_generate: Option<String>,
profile_use: Option<String>,
control_flow_guard: Option<String>,
lto: Option<String>,
relocation_model: Option<String>,
profile_generate: Option<&'a str>,
profile_use: Option<&'a str>,
control_flow_guard: Option<&'a str>,
lto: Option<&'a str>,
relocation_model: Option<&'a str>,
embed_bitcode: Option<bool>,
force_frame_pointers: Option<bool>,
link_dead_code: Option<bool>,
no_redzone: Option<bool>,
soft_float: Option<bool>,
}

impl RustcCodegenFlags {
impl<'this> RustcCodegenFlags<'this> {
// Parse flags obtained from CARGO_ENCODED_RUSTFLAGS
pub(crate) fn parse(rustflags_env: &str) -> Result<RustcCodegenFlags, Error> {
pub(crate) fn parse(rustflags_env: &'this str) -> Result<Self, Error> {
fn is_flag_prefix(flag: &str) -> bool {
[
"-Z",
Expand Down Expand Up @@ -89,12 +89,12 @@ impl RustcCodegenFlags {
}

let (flag, value) = if let Some((flag, value)) = flag.split_once('=') {
(flag, Some(value.to_owned()))
(flag, Some(value))
} else {
(flag, None)
};

fn flag_ok_or(flag: Option<String>, msg: &'static str) -> Result<String, Error> {
fn flag_ok_or<'flag>(flag: Option<&'flag str>, msg: &'static str) -> Result<&'flag str, Error> {
flag.ok_or(Error::new(ErrorKind::InvalidFlag, msg))
}

Expand Down Expand Up @@ -176,13 +176,13 @@ impl RustcCodegenFlags {
match family {
ToolFamily::Clang { .. } | ToolFamily::Gnu => {
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mbranch-protection
if let Some(value) = &self.branch_protection {
if let Some(value) = self.branch_protection {
push_if_supported(
format!("-mbranch-protection={}", value.replace(",", "+")).into(),
);
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mcmodel
if let Some(value) = &self.code_model {
if let Some(value) = self.code_model {
push_if_supported(format!("-mcmodel={value}").into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fno-vectorize
Expand All @@ -194,16 +194,16 @@ impl RustcCodegenFlags {
push_if_supported("-fno-slp-vectorize".into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fprofile-generate
if let Some(value) = &self.profile_generate {
if let Some(value) = self.profile_generate {
push_if_supported(format!("-fprofile-generate={value}").into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fprofile-use
if let Some(value) = &self.profile_use {
if let Some(value) = self.profile_use {
push_if_supported(format!("-fprofile-use={value}").into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mguard
if let Some(value) = &self.control_flow_guard {
let cc_val = match value.as_str() {
if let Some(value) = self.control_flow_guard {
let cc_val = match value {
"y" | "yes" | "on" | "true" | "checks" => Some("cf"),
"nochecks" => Some("cf-nochecks"),
"n" | "no" | "off" | "false" => Some("none"),
Expand All @@ -214,8 +214,8 @@ impl RustcCodegenFlags {
}
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-flto
if let Some(value) = &self.lto {
let cc_val = match value.as_str() {
if let Some(value) = self.lto {
let cc_val = match value {
"y" | "yes" | "on" | "true" | "fat" => Some("full"),
"thin" => Some("thin"),
_ => None,
Expand All @@ -227,8 +227,8 @@ impl RustcCodegenFlags {
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fPIC
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fPIE
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mdynamic-no-pic
if let Some(value) = &self.relocation_model {
let cc_flag = match value.as_str() {
if let Some(value) = self.relocation_model {
let cc_flag = match value {
"pic" => Some("-fPIC"),
"pie" => Some("-fPIE"),
"dynamic-no-pic" => Some("-mdynamic-no-pic"),
Expand All @@ -239,30 +239,28 @@ impl RustcCodegenFlags {
}
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fembed-bitcode
if let Some(value) = &self.embed_bitcode {
let cc_val = if *value { "all" } else { "off" };
if let Some(value) = self.embed_bitcode {
let cc_val = if value { "all" } else { "off" };
push_if_supported(format!("-fembed-bitcode={cc_val}").into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fno-omit-frame-pointer
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-fomit-frame-pointer
if let Some(value) = &self.force_frame_pointers {
let cc_flag = if *value {
if let Some(value) = self.force_frame_pointers {
let cc_flag = if value {
"-fno-omit-frame-pointer"
} else {
"-fomit-frame-pointer"
};
push_if_supported(cc_flag.into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-dead_strip
if let Some(value) = &self.link_dead_code {
if !value {
push_if_supported("-dead_strip".into());
}
if let Some(false) = self.link_dead_code {
push_if_supported("-dead_strip".into());
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mno-red-zone
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mred-zone
if let Some(value) = &self.no_redzone {
let cc_flag = if *value {
if let Some(value) = self.no_redzone {
let cc_flag = if value {
"-mno-red-zone"
} else {
"-mred-zone"
Expand All @@ -271,8 +269,8 @@ impl RustcCodegenFlags {
}
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-msoft-float
// https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mno-soft-float
if let Some(value) = &self.soft_float {
let cc_flag = if *value {
if let Some(value) = self.soft_float {
let cc_flag = if value {
"-msoft-float"
} else {
"-mno-soft-float"
Expand All @@ -282,8 +280,8 @@ impl RustcCodegenFlags {
}
ToolFamily::Msvc { .. } => {
// https://learn.microsoft.com/en-us/cpp/build/reference/guard-enable-control-flow-guard
if let Some(value) = &self.control_flow_guard {
let cc_val = match value.as_str() {
if let Some(value) = self.control_flow_guard {
let cc_val = match value {
"y" | "yes" | "on" | "true" | "checks" => Some("cf"),
"n" | "no" | "off" | "false" => Some("cf-"),
_ => None,
Expand All @@ -293,8 +291,8 @@ impl RustcCodegenFlags {
}
}
// https://learn.microsoft.com/en-us/cpp/build/reference/oy-frame-pointer-omission
if let Some(value) = &self.force_frame_pointers {
let cc_flag = if *value { "/Oy-" } else { "/Oy" };
if let Some(value) = self.force_frame_pointers {
let cc_flag = if value { "/Oy-" } else { "/Oy" };
push_if_supported(cc_flag.into());
}
}
Expand Down
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