mirror of
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208 lines
8.2 KiB
Rust
208 lines
8.2 KiB
Rust
use std::collections::HashSet;
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use std::env;
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use std::time::Instant;
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use gccjit::{
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Context,
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FunctionType,
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GlobalKind,
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};
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use rustc_middle::dep_graph;
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use rustc_middle::ty::TyCtxt;
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#[cfg(feature="master")]
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use rustc_middle::mir::mono::Visibility;
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use rustc_middle::mir::mono::Linkage;
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use rustc_codegen_ssa::{ModuleCodegen, ModuleKind};
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use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
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use rustc_codegen_ssa::mono_item::MonoItemExt;
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use rustc_codegen_ssa::traits::DebugInfoMethods;
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use rustc_session::config::DebugInfo;
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use rustc_span::Symbol;
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use crate::{LockedTargetInfo, gcc_util};
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use crate::GccContext;
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use crate::builder::Builder;
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use crate::context::CodegenCx;
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#[cfg(feature="master")]
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pub fn visibility_to_gcc(linkage: Visibility) -> gccjit::Visibility {
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match linkage {
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Visibility::Default => gccjit::Visibility::Default,
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Visibility::Hidden => gccjit::Visibility::Hidden,
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Visibility::Protected => gccjit::Visibility::Protected,
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}
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}
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pub fn global_linkage_to_gcc(linkage: Linkage) -> GlobalKind {
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match linkage {
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Linkage::External => GlobalKind::Imported,
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Linkage::AvailableExternally => GlobalKind::Imported,
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Linkage::LinkOnceAny => unimplemented!(),
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Linkage::LinkOnceODR => unimplemented!(),
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Linkage::WeakAny => unimplemented!(),
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Linkage::WeakODR => unimplemented!(),
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Linkage::Appending => unimplemented!(),
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Linkage::Internal => GlobalKind::Internal,
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Linkage::Private => GlobalKind::Internal,
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Linkage::ExternalWeak => GlobalKind::Imported, // TODO(antoyo): should be weak linkage.
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Linkage::Common => unimplemented!(),
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}
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}
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pub fn linkage_to_gcc(linkage: Linkage) -> FunctionType {
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match linkage {
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Linkage::External => FunctionType::Exported,
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// TODO(antoyo): set the attribute externally_visible.
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Linkage::AvailableExternally => FunctionType::Extern,
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Linkage::LinkOnceAny => unimplemented!(),
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Linkage::LinkOnceODR => unimplemented!(),
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Linkage::WeakAny => FunctionType::Exported, // FIXME(antoyo): should be similar to linkonce.
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Linkage::WeakODR => unimplemented!(),
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Linkage::Appending => unimplemented!(),
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Linkage::Internal => FunctionType::Internal,
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Linkage::Private => FunctionType::Internal,
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Linkage::ExternalWeak => unimplemented!(),
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Linkage::Common => unimplemented!(),
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}
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}
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pub fn compile_codegen_unit(tcx: TyCtxt<'_>, cgu_name: Symbol, target_info: LockedTargetInfo) -> (ModuleCodegen<GccContext>, u64) {
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let prof_timer = tcx.prof.generic_activity("codegen_module");
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let start_time = Instant::now();
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let dep_node = tcx.codegen_unit(cgu_name).codegen_dep_node(tcx);
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let (module, _) = tcx.dep_graph.with_task(
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dep_node,
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tcx,
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(cgu_name, target_info),
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module_codegen,
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Some(dep_graph::hash_result),
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);
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let time_to_codegen = start_time.elapsed();
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drop(prof_timer);
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// We assume that the cost to run GCC on a CGU is proportional to
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// the time we needed for codegenning it.
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let cost = time_to_codegen.as_secs() * 1_000_000_000 + time_to_codegen.subsec_nanos() as u64;
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fn module_codegen(tcx: TyCtxt<'_>, (cgu_name, target_info): (Symbol, LockedTargetInfo)) -> ModuleCodegen<GccContext> {
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let cgu = tcx.codegen_unit(cgu_name);
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// Instantiate monomorphizations without filling out definitions yet...
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let context = Context::default();
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context.add_command_line_option("-fexceptions");
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context.add_driver_option("-fexceptions");
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let disabled_features: HashSet<_> = tcx.sess.opts.cg.target_feature.split(',')
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.filter(|feature| feature.starts_with('-'))
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.map(|string| &string[1..])
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.collect();
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if tcx.sess.target.arch == "x86" || tcx.sess.target.arch == "x86_64" {
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context.add_command_line_option("-masm=intel");
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}
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if !disabled_features.contains("avx") && tcx.sess.target.arch == "x86_64" {
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// NOTE: we always enable AVX because the equivalent of llvm.x86.sse2.cmp.pd in GCC for
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// SSE2 is multiple builtins, so we use the AVX __builtin_ia32_cmppd instead.
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// FIXME(antoyo): use the proper builtins for llvm.x86.sse2.cmp.pd and similar.
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context.add_command_line_option("-mavx");
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}
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for arg in &tcx.sess.opts.cg.llvm_args {
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context.add_command_line_option(arg);
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}
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// NOTE: This is needed to compile the file src/intrinsic/archs.rs during a bootstrap of rustc.
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context.add_command_line_option("-fno-var-tracking-assignments");
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// NOTE: an optimization (https://github.com/rust-lang/rustc_codegen_gcc/issues/53).
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context.add_command_line_option("-fno-semantic-interposition");
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// NOTE: Rust relies on LLVM not doing TBAA (https://github.com/rust-lang/unsafe-code-guidelines/issues/292).
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context.add_command_line_option("-fno-strict-aliasing");
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// NOTE: Rust relies on LLVM doing wrapping on overflow.
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context.add_command_line_option("-fwrapv");
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if tcx.sess.relocation_model() == rustc_target::spec::RelocModel::Static {
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context.add_command_line_option("-mcmodel=kernel");
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context.add_command_line_option("-fno-pie");
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}
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let target_cpu = gcc_util::target_cpu(tcx.sess);
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if target_cpu != "generic" {
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context.add_command_line_option(&format!("-march={}", target_cpu));
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}
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if tcx.sess.opts.unstable_opts.function_sections.unwrap_or(tcx.sess.target.function_sections) {
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context.add_command_line_option("-ffunction-sections");
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context.add_command_line_option("-fdata-sections");
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}
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if env::var("CG_GCCJIT_DUMP_RTL").as_deref() == Ok("1") {
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context.add_command_line_option("-fdump-rtl-vregs");
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}
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if env::var("CG_GCCJIT_DUMP_RTL_ALL").as_deref() == Ok("1") {
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context.add_command_line_option("-fdump-rtl-all");
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}
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if env::var("CG_GCCJIT_DUMP_TREE_ALL").as_deref() == Ok("1") {
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context.add_command_line_option("-fdump-tree-all-eh");
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}
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if env::var("CG_GCCJIT_DUMP_IPA_ALL").as_deref() == Ok("1") {
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context.add_command_line_option("-fdump-ipa-all-eh");
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}
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if env::var("CG_GCCJIT_DUMP_CODE").as_deref() == Ok("1") {
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context.set_dump_code_on_compile(true);
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}
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if env::var("CG_GCCJIT_DUMP_GIMPLE").as_deref() == Ok("1") {
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context.set_dump_initial_gimple(true);
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}
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context.set_debug_info(true);
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if env::var("CG_GCCJIT_DUMP_EVERYTHING").as_deref() == Ok("1") {
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context.set_dump_everything(true);
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}
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if env::var("CG_GCCJIT_KEEP_INTERMEDIATES").as_deref() == Ok("1") {
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context.set_keep_intermediates(true);
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}
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if env::var("CG_GCCJIT_VERBOSE").as_deref() == Ok("1") {
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context.add_driver_option("-v");
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}
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// NOTE: The codegen generates unrechable blocks.
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context.set_allow_unreachable_blocks(true);
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{
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let cx = CodegenCx::new(&context, cgu, tcx, target_info.supports_128bit_int());
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let mono_items = cgu.items_in_deterministic_order(tcx);
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for &(mono_item, data) in &mono_items {
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mono_item.predefine::<Builder<'_, '_, '_>>(&cx, data.linkage, data.visibility);
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}
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// ... and now that we have everything pre-defined, fill out those definitions.
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for &(mono_item, _) in &mono_items {
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mono_item.define::<Builder<'_, '_, '_>>(&cx);
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}
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// If this codegen unit contains the main function, also create the
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// wrapper here
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maybe_create_entry_wrapper::<Builder<'_, '_, '_>>(&cx);
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// Finalize debuginfo
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if cx.sess().opts.debuginfo != DebugInfo::None {
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cx.debuginfo_finalize();
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}
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}
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ModuleCodegen {
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name: cgu_name.to_string(),
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module_llvm: GccContext {
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context,
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should_combine_object_files: false,
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temp_dir: None,
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},
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kind: ModuleKind::Regular,
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}
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}
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(module, cost)
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}
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