mirror of https://github.com/rust-lang/rust.git
rustc_llvm: Add a `-Z print-llvm-stats` option to expose LLVM statistics.
LLVM has a neat [statistics] feature that tracks how often optimizations kick in. It's very handy for optimization work. Since we expose the LLVM pass timings, I thought it made sense to expose the LLVM statistics too. [statistics]: https://llvm.org/docs/ProgrammersManual.html#the-statistic-class-stats-option
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@ -239,6 +239,10 @@ impl WriteBackendMethods for GccCodegenBackend {
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unimplemented!();
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}
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fn print_statistics(&self) {
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unimplemented!()
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}
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unsafe fn optimize(_cgcx: &CodegenContext<Self>, _diag_handler: &Handler, module: &ModuleCodegen<Self::Module>, config: &ModuleConfig) -> Result<(), FatalError> {
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module.module_llvm.context.set_optimization_level(to_gcc_opt_level(config.opt_level));
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Ok(())
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@ -181,6 +181,11 @@ impl WriteBackendMethods for LlvmCodegenBackend {
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llvm::LLVMRustPrintPassTimings();
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}
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}
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fn print_statistics(&self) {
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unsafe {
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llvm::LLVMRustPrintStatistics();
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}
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}
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fn run_link(
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cgcx: &CodegenContext<Self>,
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diag_handler: &Handler,
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@ -1870,6 +1870,9 @@ extern "C" {
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/// Print the pass timings since static dtors aren't picking them up.
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pub fn LLVMRustPrintPassTimings();
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/// Print the statistics since static dtors aren't picking them up.
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pub fn LLVMRustPrintStatistics();
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pub fn LLVMStructCreateNamed(C: &Context, Name: *const c_char) -> &Type;
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pub fn LLVMStructSetBody<'a>(
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@ -110,6 +110,10 @@ unsafe fn configure_llvm(sess: &Session) {
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// Use non-zero `import-instr-limit` multiplier for cold callsites.
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add("-import-cold-multiplier=0.1", false);
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if sess.print_llvm_stats() {
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add("-stats", false);
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}
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for arg in sess_args {
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add(&(*arg), true);
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}
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@ -1945,6 +1945,10 @@ impl<B: ExtraBackendMethods> OngoingCodegen<B> {
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self.backend.print_pass_timings()
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}
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if sess.print_llvm_stats() {
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self.backend.print_statistics()
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}
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(
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CodegenResults {
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metadata: self.metadata,
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@ -35,6 +35,7 @@ pub trait WriteBackendMethods: 'static + Sized + Clone {
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cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
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) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError>;
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fn print_pass_timings(&self);
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fn print_statistics(&self);
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unsafe fn optimize(
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cgcx: &CodegenContext<Self>,
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diag_handler: &Handler,
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@ -715,6 +715,7 @@ fn test_unstable_options_tracking_hash() {
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// `pre_link_arg` is omitted because it just forwards to `pre_link_args`.
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untracked!(pre_link_args, vec![String::from("abc"), String::from("def")]);
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untracked!(print_llvm_passes, true);
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untracked!(print_llvm_stats, true);
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untracked!(print_mono_items, Some(String::from("abc")));
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untracked!(print_type_sizes, true);
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untracked!(proc_macro_backtrace, true);
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@ -1,4 +1,5 @@
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#include "LLVMWrapper.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/IR/DiagnosticHandler.h"
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#include "llvm/IR/DiagnosticInfo.h"
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@ -116,6 +117,11 @@ extern "C" void LLVMRustPrintPassTimings() {
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TimerGroup::printAll(OS);
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}
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extern "C" void LLVMRustPrintStatistics() {
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raw_fd_ostream OS(2, false); // stderr.
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llvm::PrintStatistics(OS);
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}
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extern "C" LLVMValueRef LLVMRustGetNamedValue(LLVMModuleRef M, const char *Name,
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size_t NameLen) {
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return wrap(unwrap(M)->getNamedValue(StringRef(Name, NameLen)));
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@ -1672,6 +1672,9 @@ options! {
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"make rustc print the total optimization fuel used by a crate"),
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print_llvm_passes: bool = (false, parse_bool, [UNTRACKED],
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"print the LLVM optimization passes being run (default: no)"),
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#[rustc_lint_opt_deny_field_access("use `Session::print_llvm_stats` instead of this field")]
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print_llvm_stats: bool = (true, parse_bool, [UNTRACKED],
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"print LLVM statistics (default: no)"),
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print_mono_items: Option<String> = (None, parse_opt_string, [UNTRACKED],
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"print the result of the monomorphization collection pass"),
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print_type_sizes: bool = (false, parse_bool, [UNTRACKED],
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@ -1057,6 +1057,10 @@ impl Session {
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self.opts.unstable_opts.verbose
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}
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pub fn print_llvm_stats(&self) -> bool {
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self.opts.unstable_opts.print_llvm_stats
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}
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pub fn verify_llvm_ir(&self) -> bool {
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self.opts.unstable_opts.verify_llvm_ir || option_env!("RUSTC_VERIFY_LLVM_IR").is_some()
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}
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