72 lines
2.8 KiB
Rust
72 lines
2.8 KiB
Rust
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use std::path::Path;
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use std::process::Command;
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/// Uses the `llvm-bolt` binary to instrument the binary/library at the given `path` with BOLT.
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/// When the instrumented artifact is executed, it will generate BOLT profiles into
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/// `/tmp/prof.fdata.<pid>.fdata`.
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pub fn instrument_with_bolt_inplace(path: &Path) {
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let dir = std::env::temp_dir();
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let instrumented_path = dir.join("instrumented.so");
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let status = Command::new("llvm-bolt")
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.arg("-instrument")
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.arg(&path)
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// Make sure that each process will write its profiles into a separate file
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.arg("--instrumentation-file-append-pid")
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.arg("-o")
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.arg(&instrumented_path)
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.status()
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.expect("Could not instrument artifact using BOLT");
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if !status.success() {
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panic!("Could not instrument {} with BOLT, exit code {:?}", path.display(), status.code());
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}
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std::fs::copy(&instrumented_path, path).expect("Cannot copy instrumented artifact");
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std::fs::remove_file(instrumented_path).expect("Cannot delete instrumented artifact");
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}
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/// Uses the `llvm-bolt` binary to optimize the binary/library at the given `path` with BOLT,
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/// using merged profiles from `profile_path`.
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///
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/// The recorded profiles have to be merged using the `merge-fdata` tool from LLVM and the merged
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/// profile path should be then passed to this function.
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pub fn optimize_library_with_bolt_inplace(path: &Path, profile_path: &Path) {
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let dir = std::env::temp_dir();
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let optimized_path = dir.join("optimized.so");
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let status = Command::new("llvm-bolt")
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.arg(&path)
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.arg("-data")
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.arg(&profile_path)
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.arg("-o")
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.arg(&optimized_path)
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// Reorder basic blocks within functions
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.arg("-reorder-blocks=ext-tsp")
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// Reorder functions within the binary
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.arg("-reorder-functions=hfsort+")
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// Split function code into hot and code regions
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.arg("-split-functions=2")
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// Split as many basic blocks as possible
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.arg("-split-all-cold")
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// Move jump tables to a separate section
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.arg("-jump-tables=move")
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// Use GNU_STACK program header for new segment (workaround for issues with strip/objcopy)
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.arg("-use-gnu-stack")
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// Fold functions with identical code
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.arg("-icf=1")
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// Update DWARF debug info in the final binary
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.arg("-update-debug-sections")
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// Print optimization statistics
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.arg("-dyno-stats")
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.status()
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.expect("Could not optimize artifact using BOLT");
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if !status.success() {
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panic!("Could not optimize {} with BOLT, exit code {:?}", path.display(), status.code());
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}
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std::fs::copy(&optimized_path, path).expect("Cannot copy optimized artifact");
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std::fs::remove_file(optimized_path).expect("Cannot delete optimized artifact");
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}
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