805 lines
31 KiB
Rust
805 lines
31 KiB
Rust
use attributes;
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use back::bytecode::{self, RLIB_BYTECODE_EXTENSION};
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use back::lto::ThinBuffer;
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use rustc_codegen_ssa::back::write::{CodegenContext, ModuleConfig, run_assembler};
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use rustc_codegen_ssa::traits::*;
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use base;
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use consts;
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use rustc::session::config::{self, OutputType, Passes, Lto};
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use rustc::session::Session;
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use time_graph::Timeline;
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use llvm::{self, DiagnosticInfo, PassManager, SMDiagnostic};
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use llvm_util;
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use ModuleLlvm;
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use rustc_codegen_ssa::{ModuleCodegen, CompiledModule};
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use rustc::util::common::time_ext;
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use rustc_fs_util::{path_to_c_string, link_or_copy};
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use rustc_data_structures::small_c_str::SmallCStr;
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use errors::{self, Handler, FatalError};
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use type_::Type;
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use context::{is_pie_binary, get_reloc_model};
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use common;
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use LlvmCodegenBackend;
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use rustc_demangle;
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use std::ffi::{CString, CStr};
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use std::fs;
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use std::io::{self, Write};
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use std::path::Path;
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use std::str;
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use std::sync::Arc;
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use std::slice;
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use libc::{c_uint, c_void, c_char, size_t};
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pub const RELOC_MODEL_ARGS : [(&str, llvm::RelocMode); 7] = [
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("pic", llvm::RelocMode::PIC),
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("static", llvm::RelocMode::Static),
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("default", llvm::RelocMode::Default),
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("dynamic-no-pic", llvm::RelocMode::DynamicNoPic),
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("ropi", llvm::RelocMode::ROPI),
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("rwpi", llvm::RelocMode::RWPI),
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("ropi-rwpi", llvm::RelocMode::ROPI_RWPI),
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];
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pub const CODE_GEN_MODEL_ARGS: &[(&str, llvm::CodeModel)] = &[
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("small", llvm::CodeModel::Small),
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("kernel", llvm::CodeModel::Kernel),
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("medium", llvm::CodeModel::Medium),
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("large", llvm::CodeModel::Large),
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];
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pub const TLS_MODEL_ARGS : [(&str, llvm::ThreadLocalMode); 4] = [
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("global-dynamic", llvm::ThreadLocalMode::GeneralDynamic),
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("local-dynamic", llvm::ThreadLocalMode::LocalDynamic),
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("initial-exec", llvm::ThreadLocalMode::InitialExec),
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("local-exec", llvm::ThreadLocalMode::LocalExec),
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];
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pub fn llvm_err(handler: &errors::Handler, msg: &str) -> FatalError {
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match llvm::last_error() {
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Some(err) => handler.fatal(&format!("{}: {}", msg, err)),
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None => handler.fatal(&msg),
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}
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}
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pub fn write_output_file(
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handler: &errors::Handler,
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target: &'ll llvm::TargetMachine,
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pm: &llvm::PassManager<'ll>,
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m: &'ll llvm::Module,
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output: &Path,
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file_type: llvm::FileType) -> Result<(), FatalError> {
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unsafe {
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let output_c = path_to_c_string(output);
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let result = llvm::LLVMRustWriteOutputFile(target, pm, m, output_c.as_ptr(), file_type);
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if result.into_result().is_err() {
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let msg = format!("could not write output to {}", output.display());
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Err(llvm_err(handler, &msg))
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} else {
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Ok(())
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}
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}
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}
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pub(crate) fn get_llvm_opt_level(optimize: config::OptLevel) -> llvm::CodeGenOptLevel {
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match optimize {
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config::OptLevel::No => llvm::CodeGenOptLevel::None,
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config::OptLevel::Less => llvm::CodeGenOptLevel::Less,
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config::OptLevel::Default => llvm::CodeGenOptLevel::Default,
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config::OptLevel::Aggressive => llvm::CodeGenOptLevel::Aggressive,
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_ => llvm::CodeGenOptLevel::Default,
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}
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}
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pub(crate) fn get_llvm_opt_size(optimize: config::OptLevel) -> llvm::CodeGenOptSize {
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match optimize {
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config::OptLevel::Size => llvm::CodeGenOptSizeDefault,
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config::OptLevel::SizeMin => llvm::CodeGenOptSizeAggressive,
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_ => llvm::CodeGenOptSizeNone,
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}
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}
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pub fn create_target_machine(
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sess: &Session,
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find_features: bool,
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) -> &'static mut llvm::TargetMachine {
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target_machine_factory(sess, find_features)().unwrap_or_else(|err| {
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llvm_err(sess.diagnostic(), &err).raise()
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})
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}
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// If find_features is true this won't access `sess.crate_types` by assuming
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// that `is_pie_binary` is false. When we discover LLVM target features
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// `sess.crate_types` is uninitialized so we cannot access it.
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pub fn target_machine_factory(sess: &Session, find_features: bool)
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-> Arc<dyn Fn() -> Result<&'static mut llvm::TargetMachine, String> + Send + Sync>
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{
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let reloc_model = get_reloc_model(sess);
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let opt_level = get_llvm_opt_level(sess.opts.optimize);
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let use_softfp = sess.opts.cg.soft_float;
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let ffunction_sections = sess.target.target.options.function_sections;
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let fdata_sections = ffunction_sections;
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let code_model_arg = sess.opts.cg.code_model.as_ref().or(
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sess.target.target.options.code_model.as_ref(),
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);
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let code_model = match code_model_arg {
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Some(s) => {
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match CODE_GEN_MODEL_ARGS.iter().find(|arg| arg.0 == s) {
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Some(x) => x.1,
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_ => {
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sess.err(&format!("{:?} is not a valid code model",
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code_model_arg));
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sess.abort_if_errors();
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bug!();
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}
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}
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}
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None => llvm::CodeModel::None,
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};
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let features = attributes::llvm_target_features(sess).collect::<Vec<_>>();
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let mut singlethread = sess.target.target.options.singlethread;
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// On the wasm target once the `atomics` feature is enabled that means that
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// we're no longer single-threaded, or otherwise we don't want LLVM to
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// lower atomic operations to single-threaded operations.
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if singlethread &&
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sess.target.target.llvm_target.contains("wasm32") &&
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features.iter().any(|s| *s == "+atomics")
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{
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singlethread = false;
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}
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let triple = SmallCStr::new(&sess.target.target.llvm_target);
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let cpu = SmallCStr::new(llvm_util::target_cpu(sess));
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let features = features.join(",");
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let features = CString::new(features).unwrap();
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let is_pie_binary = !find_features && is_pie_binary(sess);
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let trap_unreachable = sess.target.target.options.trap_unreachable;
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let emit_stack_size_section = sess.opts.debugging_opts.emit_stack_sizes;
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let asm_comments = sess.asm_comments();
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Arc::new(move || {
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let tm = unsafe {
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llvm::LLVMRustCreateTargetMachine(
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triple.as_ptr(), cpu.as_ptr(), features.as_ptr(),
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code_model,
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reloc_model,
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opt_level,
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use_softfp,
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is_pie_binary,
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ffunction_sections,
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fdata_sections,
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trap_unreachable,
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singlethread,
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asm_comments,
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emit_stack_size_section,
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)
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};
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tm.ok_or_else(|| {
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format!("Could not create LLVM TargetMachine for triple: {}",
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triple.to_str().unwrap())
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})
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})
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}
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pub(crate) fn save_temp_bitcode(
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cgcx: &CodegenContext<LlvmCodegenBackend>,
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module: &ModuleCodegen<ModuleLlvm>,
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name: &str
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) {
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if !cgcx.save_temps {
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return
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}
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unsafe {
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let ext = format!("{}.bc", name);
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let cgu = Some(&module.name[..]);
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let path = cgcx.output_filenames.temp_path_ext(&ext, cgu);
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let cstr = path_to_c_string(&path);
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let llmod = module.module_llvm.llmod();
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llvm::LLVMWriteBitcodeToFile(llmod, cstr.as_ptr());
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}
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}
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pub struct DiagnosticHandlers<'a> {
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data: *mut (&'a CodegenContext<LlvmCodegenBackend>, &'a Handler),
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llcx: &'a llvm::Context,
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}
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impl<'a> DiagnosticHandlers<'a> {
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pub fn new(cgcx: &'a CodegenContext<LlvmCodegenBackend>,
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handler: &'a Handler,
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llcx: &'a llvm::Context) -> Self {
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let data = Box::into_raw(Box::new((cgcx, handler)));
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unsafe {
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llvm::LLVMRustSetInlineAsmDiagnosticHandler(llcx, inline_asm_handler, data as *mut _);
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llvm::LLVMContextSetDiagnosticHandler(llcx, diagnostic_handler, data as *mut _);
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}
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DiagnosticHandlers { data, llcx }
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}
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}
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impl<'a> Drop for DiagnosticHandlers<'a> {
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fn drop(&mut self) {
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use std::ptr::null_mut;
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unsafe {
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llvm::LLVMRustSetInlineAsmDiagnosticHandler(self.llcx, inline_asm_handler, null_mut());
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llvm::LLVMContextSetDiagnosticHandler(self.llcx, diagnostic_handler, null_mut());
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drop(Box::from_raw(self.data));
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}
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}
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}
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unsafe extern "C" fn report_inline_asm<'a, 'b>(cgcx: &'a CodegenContext<LlvmCodegenBackend>,
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msg: &'b str,
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cookie: c_uint) {
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cgcx.diag_emitter.inline_asm_error(cookie as u32, msg.to_owned());
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}
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unsafe extern "C" fn inline_asm_handler(diag: &SMDiagnostic,
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user: *const c_void,
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cookie: c_uint) {
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if user.is_null() {
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return
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}
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let (cgcx, _) = *(user as *const (&CodegenContext<LlvmCodegenBackend>, &Handler));
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let msg = llvm::build_string(|s| llvm::LLVMRustWriteSMDiagnosticToString(diag, s))
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.expect("non-UTF8 SMDiagnostic");
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report_inline_asm(cgcx, &msg, cookie);
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}
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unsafe extern "C" fn diagnostic_handler(info: &DiagnosticInfo, user: *mut c_void) {
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if user.is_null() {
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return
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}
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let (cgcx, diag_handler) = *(user as *const (&CodegenContext<LlvmCodegenBackend>, &Handler));
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match llvm::diagnostic::Diagnostic::unpack(info) {
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llvm::diagnostic::InlineAsm(inline) => {
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report_inline_asm(cgcx,
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&llvm::twine_to_string(inline.message),
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inline.cookie);
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}
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llvm::diagnostic::Optimization(opt) => {
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let enabled = match cgcx.remark {
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Passes::All => true,
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Passes::Some(ref v) => v.iter().any(|s| *s == opt.pass_name),
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};
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if enabled {
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diag_handler.note_without_error(&format!("optimization {} for {} at {}:{}:{}: {}",
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opt.kind.describe(),
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opt.pass_name,
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opt.filename,
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opt.line,
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opt.column,
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opt.message));
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}
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}
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llvm::diagnostic::PGO(diagnostic_ref) |
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llvm::diagnostic::Linker(diagnostic_ref) => {
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let msg = llvm::build_string(|s| {
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llvm::LLVMRustWriteDiagnosticInfoToString(diagnostic_ref, s)
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}).expect("non-UTF8 diagnostic");
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diag_handler.warn(&msg);
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}
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llvm::diagnostic::UnknownDiagnostic(..) => {},
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}
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}
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// Unsafe due to LLVM calls.
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pub(crate) unsafe fn optimize(cgcx: &CodegenContext<LlvmCodegenBackend>,
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diag_handler: &Handler,
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module: &ModuleCodegen<ModuleLlvm>,
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config: &ModuleConfig,
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timeline: &mut Timeline)
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-> Result<(), FatalError>
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{
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let llmod = module.module_llvm.llmod();
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let llcx = &*module.module_llvm.llcx;
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let tm = &*module.module_llvm.tm;
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let _handlers = DiagnosticHandlers::new(cgcx, diag_handler, llcx);
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let module_name = module.name.clone();
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let module_name = Some(&module_name[..]);
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if config.emit_no_opt_bc {
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let out = cgcx.output_filenames.temp_path_ext("no-opt.bc", module_name);
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let out = path_to_c_string(&out);
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llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr());
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}
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if config.opt_level.is_some() {
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// Create the two optimizing pass managers. These mirror what clang
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// does, and are by populated by LLVM's default PassManagerBuilder.
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// Each manager has a different set of passes, but they also share
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// some common passes.
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let fpm = llvm::LLVMCreateFunctionPassManagerForModule(llmod);
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let mpm = llvm::LLVMCreatePassManager();
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{
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// If we're verifying or linting, add them to the function pass
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// manager.
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let addpass = |pass_name: &str| {
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let pass_name = SmallCStr::new(pass_name);
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let pass = match llvm::LLVMRustFindAndCreatePass(pass_name.as_ptr()) {
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Some(pass) => pass,
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None => return false,
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};
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let pass_manager = match llvm::LLVMRustPassKind(pass) {
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llvm::PassKind::Function => &*fpm,
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llvm::PassKind::Module => &*mpm,
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llvm::PassKind::Other => {
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diag_handler.err("Encountered LLVM pass kind we can't handle");
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return true
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},
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};
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llvm::LLVMRustAddPass(pass_manager, pass);
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true
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};
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if config.verify_llvm_ir { assert!(addpass("verify")); }
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// Some options cause LLVM bitcode to be emitted, which uses ThinLTOBuffers, so we need
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// to make sure we run LLVM's NameAnonGlobals pass when emitting bitcode; otherwise
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// we'll get errors in LLVM.
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let using_thin_buffers = config.bitcode_needed();
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let mut have_name_anon_globals_pass = false;
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if !config.no_prepopulate_passes {
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llvm::LLVMRustAddAnalysisPasses(tm, fpm, llmod);
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llvm::LLVMRustAddAnalysisPasses(tm, mpm, llmod);
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let opt_level = config.opt_level.map(get_llvm_opt_level)
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.unwrap_or(llvm::CodeGenOptLevel::None);
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let prepare_for_thin_lto = cgcx.lto == Lto::Thin || cgcx.lto == Lto::ThinLocal ||
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(cgcx.lto != Lto::Fat && cgcx.opts.debugging_opts.cross_lang_lto.enabled());
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with_llvm_pmb(llmod, &config, opt_level, prepare_for_thin_lto, &mut |b| {
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llvm::LLVMPassManagerBuilderPopulateFunctionPassManager(b, fpm);
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llvm::LLVMPassManagerBuilderPopulateModulePassManager(b, mpm);
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});
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have_name_anon_globals_pass = have_name_anon_globals_pass || prepare_for_thin_lto;
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if using_thin_buffers && !prepare_for_thin_lto {
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assert!(addpass("name-anon-globals"));
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have_name_anon_globals_pass = true;
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}
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}
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for pass in &config.passes {
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if !addpass(pass) {
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diag_handler.warn(&format!("unknown pass `{}`, ignoring", pass));
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}
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if pass == "name-anon-globals" {
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have_name_anon_globals_pass = true;
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}
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}
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for pass in &cgcx.plugin_passes {
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if !addpass(pass) {
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diag_handler.err(&format!("a plugin asked for LLVM pass \
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`{}` but LLVM does not \
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recognize it", pass));
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}
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if pass == "name-anon-globals" {
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have_name_anon_globals_pass = true;
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}
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}
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if using_thin_buffers && !have_name_anon_globals_pass {
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// As described above, this will probably cause an error in LLVM
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if config.no_prepopulate_passes {
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diag_handler.err("The current compilation is going to use thin LTO buffers \
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without running LLVM's NameAnonGlobals pass. \
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This will likely cause errors in LLVM. Consider adding \
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-C passes=name-anon-globals to the compiler command line.");
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} else {
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bug!("We are using thin LTO buffers without running the NameAnonGlobals pass. \
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This will likely cause errors in LLVM and should never happen.");
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}
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}
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}
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diag_handler.abort_if_errors();
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// Finally, run the actual optimization passes
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time_ext(config.time_passes,
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None,
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&format!("llvm function passes [{}]", module_name.unwrap()),
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|| {
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llvm::LLVMRustRunFunctionPassManager(fpm, llmod)
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});
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timeline.record("fpm");
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time_ext(config.time_passes,
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None,
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&format!("llvm module passes [{}]", module_name.unwrap()),
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|| {
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llvm::LLVMRunPassManager(mpm, llmod)
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});
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// Deallocate managers that we're now done with
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llvm::LLVMDisposePassManager(fpm);
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llvm::LLVMDisposePassManager(mpm);
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}
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Ok(())
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}
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pub(crate) unsafe fn codegen(cgcx: &CodegenContext<LlvmCodegenBackend>,
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diag_handler: &Handler,
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module: ModuleCodegen<ModuleLlvm>,
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config: &ModuleConfig,
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timeline: &mut Timeline)
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-> Result<CompiledModule, FatalError>
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{
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timeline.record("codegen");
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{
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let llmod = module.module_llvm.llmod();
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let llcx = &*module.module_llvm.llcx;
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let tm = &*module.module_llvm.tm;
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let module_name = module.name.clone();
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let module_name = Some(&module_name[..]);
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let handlers = DiagnosticHandlers::new(cgcx, diag_handler, llcx);
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if cgcx.msvc_imps_needed {
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create_msvc_imps(cgcx, llcx, llmod);
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}
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// A codegen-specific pass manager is used to generate object
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// files for an LLVM module.
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//
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// Apparently each of these pass managers is a one-shot kind of
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// thing, so we create a new one for each type of output. The
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// pass manager passed to the closure should be ensured to not
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// escape the closure itself, and the manager should only be
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// used once.
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unsafe fn with_codegen<'ll, F, R>(tm: &'ll llvm::TargetMachine,
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llmod: &'ll llvm::Module,
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|
no_builtins: bool,
|
|
f: F) -> R
|
|
where F: FnOnce(&'ll mut PassManager<'ll>) -> R,
|
|
{
|
|
let cpm = llvm::LLVMCreatePassManager();
|
|
llvm::LLVMRustAddAnalysisPasses(tm, cpm, llmod);
|
|
llvm::LLVMRustAddLibraryInfo(cpm, llmod, no_builtins);
|
|
f(cpm)
|
|
}
|
|
|
|
// If we don't have the integrated assembler, then we need to emit asm
|
|
// from LLVM and use `gcc` to create the object file.
|
|
let asm_to_obj = config.emit_obj && config.no_integrated_as;
|
|
|
|
// Change what we write and cleanup based on whether obj files are
|
|
// just llvm bitcode. In that case write bitcode, and possibly
|
|
// delete the bitcode if it wasn't requested. Don't generate the
|
|
// machine code, instead copy the .o file from the .bc
|
|
let write_bc = config.emit_bc || config.obj_is_bitcode;
|
|
let rm_bc = !config.emit_bc && config.obj_is_bitcode;
|
|
let write_obj = config.emit_obj && !config.obj_is_bitcode && !asm_to_obj;
|
|
let copy_bc_to_obj = config.emit_obj && config.obj_is_bitcode;
|
|
|
|
let bc_out = cgcx.output_filenames.temp_path(OutputType::Bitcode, module_name);
|
|
let obj_out = cgcx.output_filenames.temp_path(OutputType::Object, module_name);
|
|
|
|
|
|
if write_bc || config.emit_bc_compressed || config.embed_bitcode {
|
|
let thin = ThinBuffer::new(llmod);
|
|
let data = thin.data();
|
|
timeline.record("make-bc");
|
|
|
|
if write_bc {
|
|
if let Err(e) = fs::write(&bc_out, data) {
|
|
diag_handler.err(&format!("failed to write bytecode: {}", e));
|
|
}
|
|
timeline.record("write-bc");
|
|
}
|
|
|
|
if config.embed_bitcode {
|
|
embed_bitcode(cgcx, llcx, llmod, Some(data));
|
|
timeline.record("embed-bc");
|
|
}
|
|
|
|
if config.emit_bc_compressed {
|
|
let dst = bc_out.with_extension(RLIB_BYTECODE_EXTENSION);
|
|
let data = bytecode::encode(&module.name, data);
|
|
if let Err(e) = fs::write(&dst, data) {
|
|
diag_handler.err(&format!("failed to write bytecode: {}", e));
|
|
}
|
|
timeline.record("compress-bc");
|
|
}
|
|
} else if config.embed_bitcode_marker {
|
|
embed_bitcode(cgcx, llcx, llmod, None);
|
|
}
|
|
|
|
time_ext(config.time_passes, None, &format!("codegen passes [{}]", module_name.unwrap()),
|
|
|| -> Result<(), FatalError> {
|
|
if config.emit_ir {
|
|
let out = cgcx.output_filenames.temp_path(OutputType::LlvmAssembly, module_name);
|
|
let out = path_to_c_string(&out);
|
|
|
|
extern "C" fn demangle_callback(input_ptr: *const c_char,
|
|
input_len: size_t,
|
|
output_ptr: *mut c_char,
|
|
output_len: size_t) -> size_t {
|
|
let input = unsafe {
|
|
slice::from_raw_parts(input_ptr as *const u8, input_len as usize)
|
|
};
|
|
|
|
let input = match str::from_utf8(input) {
|
|
Ok(s) => s,
|
|
Err(_) => return 0,
|
|
};
|
|
|
|
let output = unsafe {
|
|
slice::from_raw_parts_mut(output_ptr as *mut u8, output_len as usize)
|
|
};
|
|
let mut cursor = io::Cursor::new(output);
|
|
|
|
let demangled = match rustc_demangle::try_demangle(input) {
|
|
Ok(d) => d,
|
|
Err(_) => return 0,
|
|
};
|
|
|
|
if let Err(_) = write!(cursor, "{:#}", demangled) {
|
|
// Possible only if provided buffer is not big enough
|
|
return 0;
|
|
}
|
|
|
|
cursor.position() as size_t
|
|
}
|
|
|
|
with_codegen(tm, llmod, config.no_builtins, |cpm| {
|
|
llvm::LLVMRustPrintModule(cpm, llmod, out.as_ptr(), demangle_callback);
|
|
llvm::LLVMDisposePassManager(cpm);
|
|
});
|
|
timeline.record("ir");
|
|
}
|
|
|
|
if config.emit_asm || asm_to_obj {
|
|
let path = cgcx.output_filenames.temp_path(OutputType::Assembly, module_name);
|
|
|
|
// We can't use the same module for asm and binary output, because that triggers
|
|
// various errors like invalid IR or broken binaries, so we might have to clone the
|
|
// module to produce the asm output
|
|
let llmod = if config.emit_obj {
|
|
llvm::LLVMCloneModule(llmod)
|
|
} else {
|
|
llmod
|
|
};
|
|
with_codegen(tm, llmod, config.no_builtins, |cpm| {
|
|
write_output_file(diag_handler, tm, cpm, llmod, &path,
|
|
llvm::FileType::AssemblyFile)
|
|
})?;
|
|
timeline.record("asm");
|
|
}
|
|
|
|
if write_obj {
|
|
with_codegen(tm, llmod, config.no_builtins, |cpm| {
|
|
write_output_file(diag_handler, tm, cpm, llmod, &obj_out,
|
|
llvm::FileType::ObjectFile)
|
|
})?;
|
|
timeline.record("obj");
|
|
} else if asm_to_obj {
|
|
let assembly = cgcx.output_filenames.temp_path(OutputType::Assembly, module_name);
|
|
run_assembler(cgcx, diag_handler, &assembly, &obj_out);
|
|
timeline.record("asm_to_obj");
|
|
|
|
if !config.emit_asm && !cgcx.save_temps {
|
|
drop(fs::remove_file(&assembly));
|
|
}
|
|
}
|
|
|
|
Ok(())
|
|
})?;
|
|
|
|
if copy_bc_to_obj {
|
|
debug!("copying bitcode {:?} to obj {:?}", bc_out, obj_out);
|
|
if let Err(e) = link_or_copy(&bc_out, &obj_out) {
|
|
diag_handler.err(&format!("failed to copy bitcode to object file: {}", e));
|
|
}
|
|
}
|
|
|
|
if rm_bc {
|
|
debug!("removing_bitcode {:?}", bc_out);
|
|
if let Err(e) = fs::remove_file(&bc_out) {
|
|
diag_handler.err(&format!("failed to remove bitcode: {}", e));
|
|
}
|
|
}
|
|
|
|
drop(handlers);
|
|
}
|
|
Ok(module.into_compiled_module(config.emit_obj,
|
|
config.emit_bc,
|
|
config.emit_bc_compressed,
|
|
&cgcx.output_filenames))
|
|
}
|
|
|
|
/// Embed the bitcode of an LLVM module in the LLVM module itself.
|
|
///
|
|
/// This is done primarily for iOS where it appears to be standard to compile C
|
|
/// code at least with `-fembed-bitcode` which creates two sections in the
|
|
/// executable:
|
|
///
|
|
/// * __LLVM,__bitcode
|
|
/// * __LLVM,__cmdline
|
|
///
|
|
/// It appears *both* of these sections are necessary to get the linker to
|
|
/// recognize what's going on. For us though we just always throw in an empty
|
|
/// cmdline section.
|
|
///
|
|
/// Furthermore debug/O1 builds don't actually embed bitcode but rather just
|
|
/// embed an empty section.
|
|
///
|
|
/// Basically all of this is us attempting to follow in the footsteps of clang
|
|
/// on iOS. See #35968 for lots more info.
|
|
unsafe fn embed_bitcode(cgcx: &CodegenContext<LlvmCodegenBackend>,
|
|
llcx: &llvm::Context,
|
|
llmod: &llvm::Module,
|
|
bitcode: Option<&[u8]>) {
|
|
let llconst = common::bytes_in_context(llcx, bitcode.unwrap_or(&[]));
|
|
let llglobal = llvm::LLVMAddGlobal(
|
|
llmod,
|
|
common::val_ty(llconst),
|
|
"rustc.embedded.module\0".as_ptr() as *const _,
|
|
);
|
|
llvm::LLVMSetInitializer(llglobal, llconst);
|
|
|
|
let is_apple = cgcx.opts.target_triple.triple().contains("-ios") ||
|
|
cgcx.opts.target_triple.triple().contains("-darwin");
|
|
|
|
let section = if is_apple {
|
|
"__LLVM,__bitcode\0"
|
|
} else {
|
|
".llvmbc\0"
|
|
};
|
|
llvm::LLVMSetSection(llglobal, section.as_ptr() as *const _);
|
|
llvm::LLVMRustSetLinkage(llglobal, llvm::Linkage::PrivateLinkage);
|
|
llvm::LLVMSetGlobalConstant(llglobal, llvm::True);
|
|
|
|
let llconst = common::bytes_in_context(llcx, &[]);
|
|
let llglobal = llvm::LLVMAddGlobal(
|
|
llmod,
|
|
common::val_ty(llconst),
|
|
"rustc.embedded.cmdline\0".as_ptr() as *const _,
|
|
);
|
|
llvm::LLVMSetInitializer(llglobal, llconst);
|
|
let section = if is_apple {
|
|
"__LLVM,__cmdline\0"
|
|
} else {
|
|
".llvmcmd\0"
|
|
};
|
|
llvm::LLVMSetSection(llglobal, section.as_ptr() as *const _);
|
|
llvm::LLVMRustSetLinkage(llglobal, llvm::Linkage::PrivateLinkage);
|
|
}
|
|
|
|
pub unsafe fn with_llvm_pmb(llmod: &llvm::Module,
|
|
config: &ModuleConfig,
|
|
opt_level: llvm::CodeGenOptLevel,
|
|
prepare_for_thin_lto: bool,
|
|
f: &mut dyn FnMut(&llvm::PassManagerBuilder)) {
|
|
use std::ptr;
|
|
|
|
// Create the PassManagerBuilder for LLVM. We configure it with
|
|
// reasonable defaults and prepare it to actually populate the pass
|
|
// manager.
|
|
let builder = llvm::LLVMPassManagerBuilderCreate();
|
|
let opt_size = config.opt_size.map(get_llvm_opt_size).unwrap_or(llvm::CodeGenOptSizeNone);
|
|
let inline_threshold = config.inline_threshold;
|
|
|
|
let pgo_gen_path = config.pgo_gen.as_ref().map(|s| {
|
|
let s = if s.is_empty() { "default_%m.profraw" } else { s };
|
|
CString::new(s.as_bytes()).unwrap()
|
|
});
|
|
|
|
let pgo_use_path = if config.pgo_use.is_empty() {
|
|
None
|
|
} else {
|
|
Some(CString::new(config.pgo_use.as_bytes()).unwrap())
|
|
};
|
|
|
|
llvm::LLVMRustConfigurePassManagerBuilder(
|
|
builder,
|
|
opt_level,
|
|
config.merge_functions,
|
|
config.vectorize_slp,
|
|
config.vectorize_loop,
|
|
prepare_for_thin_lto,
|
|
pgo_gen_path.as_ref().map_or(ptr::null(), |s| s.as_ptr()),
|
|
pgo_use_path.as_ref().map_or(ptr::null(), |s| s.as_ptr()),
|
|
);
|
|
|
|
llvm::LLVMPassManagerBuilderSetSizeLevel(builder, opt_size as u32);
|
|
|
|
if opt_size != llvm::CodeGenOptSizeNone {
|
|
llvm::LLVMPassManagerBuilderSetDisableUnrollLoops(builder, 1);
|
|
}
|
|
|
|
llvm::LLVMRustAddBuilderLibraryInfo(builder, llmod, config.no_builtins);
|
|
|
|
// Here we match what clang does (kinda). For O0 we only inline
|
|
// always-inline functions (but don't add lifetime intrinsics), at O1 we
|
|
// inline with lifetime intrinsics, and O2+ we add an inliner with a
|
|
// thresholds copied from clang.
|
|
match (opt_level, opt_size, inline_threshold) {
|
|
(.., Some(t)) => {
|
|
llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, t as u32);
|
|
}
|
|
(llvm::CodeGenOptLevel::Aggressive, ..) => {
|
|
llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 275);
|
|
}
|
|
(_, llvm::CodeGenOptSizeDefault, _) => {
|
|
llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 75);
|
|
}
|
|
(_, llvm::CodeGenOptSizeAggressive, _) => {
|
|
llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 25);
|
|
}
|
|
(llvm::CodeGenOptLevel::None, ..) => {
|
|
llvm::LLVMRustAddAlwaysInlinePass(builder, false);
|
|
}
|
|
(llvm::CodeGenOptLevel::Less, ..) => {
|
|
llvm::LLVMRustAddAlwaysInlinePass(builder, true);
|
|
}
|
|
(llvm::CodeGenOptLevel::Default, ..) => {
|
|
llvm::LLVMPassManagerBuilderUseInlinerWithThreshold(builder, 225);
|
|
}
|
|
(llvm::CodeGenOptLevel::Other, ..) => {
|
|
bug!("CodeGenOptLevel::Other selected")
|
|
}
|
|
}
|
|
|
|
f(builder);
|
|
llvm::LLVMPassManagerBuilderDispose(builder);
|
|
}
|
|
|
|
// Create a `__imp_<symbol> = &symbol` global for every public static `symbol`.
|
|
// This is required to satisfy `dllimport` references to static data in .rlibs
|
|
// when using MSVC linker. We do this only for data, as linker can fix up
|
|
// code references on its own.
|
|
// See #26591, #27438
|
|
fn create_msvc_imps(
|
|
cgcx: &CodegenContext<LlvmCodegenBackend>,
|
|
llcx: &llvm::Context,
|
|
llmod: &llvm::Module
|
|
) {
|
|
if !cgcx.msvc_imps_needed {
|
|
return
|
|
}
|
|
// The x86 ABI seems to require that leading underscores are added to symbol
|
|
// names, so we need an extra underscore on 32-bit. There's also a leading
|
|
// '\x01' here which disables LLVM's symbol mangling (e.g., no extra
|
|
// underscores added in front).
|
|
let prefix = if cgcx.target_pointer_width == "32" {
|
|
"\x01__imp__"
|
|
} else {
|
|
"\x01__imp_"
|
|
};
|
|
unsafe {
|
|
let i8p_ty = Type::i8p_llcx(llcx);
|
|
let globals = base::iter_globals(llmod)
|
|
.filter(|&val| {
|
|
llvm::LLVMRustGetLinkage(val) == llvm::Linkage::ExternalLinkage &&
|
|
llvm::LLVMIsDeclaration(val) == 0
|
|
})
|
|
.map(move |val| {
|
|
let name = CStr::from_ptr(llvm::LLVMGetValueName(val));
|
|
let mut imp_name = prefix.as_bytes().to_vec();
|
|
imp_name.extend(name.to_bytes());
|
|
let imp_name = CString::new(imp_name).unwrap();
|
|
(imp_name, val)
|
|
})
|
|
.collect::<Vec<_>>();
|
|
for (imp_name, val) in globals {
|
|
let imp = llvm::LLVMAddGlobal(llmod,
|
|
i8p_ty,
|
|
imp_name.as_ptr() as *const _);
|
|
llvm::LLVMSetInitializer(imp, consts::ptrcast(val, i8p_ty));
|
|
llvm::LLVMRustSetLinkage(imp, llvm::Linkage::ExternalLinkage);
|
|
}
|
|
}
|
|
}
|