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