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|
//! Codegen the MIR to the LLVM IR.
//!
//! Hopefully useful general knowledge about codegen:
//!
//! * There's no way to find out the [`Ty`] type of a [`Value`]. Doing so
//! would be "trying to get the eggs out of an omelette" (credit:
//! pcwalton). You can, instead, find out its [`llvm::Type`] by calling [`val_ty`],
//! but one [`llvm::Type`] corresponds to many [`Ty`]s; for instance, `tup(int, int,
//! int)` and `rec(x=int, y=int, z=int)` will have the same [`llvm::Type`].
//!
//! [`Ty`]: rustc_middle::ty::Ty
//! [`val_ty`]: crate::common::val_ty
use super::ModuleLlvm;
use crate::attributes;
use crate::builder::Builder;
use crate::context::CodegenCx;
use crate::llvm;
use crate::value::Value;
use cstr::cstr;
use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
use rustc_codegen_ssa::mono_item::MonoItemExt;
use rustc_codegen_ssa::traits::*;
use rustc_codegen_ssa::{ModuleCodegen, ModuleKind};
use rustc_data_structures::small_c_str::SmallCStr;
use rustc_middle::dep_graph;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs;
use rustc_middle::mir::mono::{Linkage, Visibility};
use rustc_middle::ty::TyCtxt;
use rustc_session::config::DebugInfo;
use rustc_span::symbol::Symbol;
use rustc_target::spec::SanitizerSet;
use std::time::Instant;
pub struct ValueIter<'ll> {
cur: Option<&'ll Value>,
step: unsafe extern "C" fn(&'ll Value) -> Option<&'ll Value>,
}
impl<'ll> Iterator for ValueIter<'ll> {
type Item = &'ll Value;
fn next(&mut self) -> Option<&'ll Value> {
let old = self.cur;
if let Some(old) = old {
self.cur = unsafe { (self.step)(old) };
}
old
}
}
pub fn iter_globals(llmod: &llvm::Module) -> ValueIter<'_> {
unsafe { ValueIter { cur: llvm::LLVMGetFirstGlobal(llmod), step: llvm::LLVMGetNextGlobal } }
}
pub fn compile_codegen_unit(tcx: TyCtxt<'_>, cgu_name: Symbol) -> (ModuleCodegen<ModuleLlvm>, u64) {
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,
module_codegen,
Some(dep_graph::hash_result),
);
let time_to_codegen = start_time.elapsed();
// We assume that the cost to run LLVM on a CGU is proportional to
// the time we needed for codegenning it.
let cost = time_to_codegen.as_nanos() as u64;
fn module_codegen(tcx: TyCtxt<'_>, cgu_name: Symbol) -> ModuleCodegen<ModuleLlvm> {
let cgu = tcx.codegen_unit(cgu_name);
let _prof_timer =
tcx.prof.generic_activity_with_arg_recorder("codegen_module", |recorder| {
recorder.record_arg(cgu_name.to_string());
recorder.record_arg(cgu.size_estimate().to_string());
});
// Instantiate monomorphizations without filling out definitions yet...
let llvm_module = ModuleLlvm::new(tcx, cgu_name.as_str());
{
let cx = CodegenCx::new(tcx, cgu, &llvm_module);
let mono_items = cx.codegen_unit.items_in_deterministic_order(cx.tcx);
for &(mono_item, (linkage, visibility)) in &mono_items {
mono_item.predefine::<Builder<'_, '_, '_>>(&cx, linkage, 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
if let Some(entry) = maybe_create_entry_wrapper::<Builder<'_, '_, '_>>(&cx) {
let attrs = attributes::sanitize_attrs(&cx, SanitizerSet::empty());
attributes::apply_to_llfn(entry, llvm::AttributePlace::Function, &attrs);
}
// Finalize code coverage by injecting the coverage map. Note, the coverage map will
// also be added to the `llvm.compiler.used` variable, created next.
if cx.sess().instrument_coverage() {
cx.coverageinfo_finalize();
}
// Create the llvm.used and llvm.compiler.used variables.
if !cx.used_statics.borrow().is_empty() {
cx.create_used_variable_impl(cstr!("llvm.used"), &*cx.used_statics.borrow());
}
if !cx.compiler_used_statics.borrow().is_empty() {
cx.create_used_variable_impl(
cstr!("llvm.compiler.used"),
&*cx.compiler_used_statics.borrow(),
);
}
// Run replace-all-uses-with for statics that need it. This must
// happen after the llvm.used variables are created.
for &(old_g, new_g) in cx.statics_to_rauw().borrow().iter() {
unsafe {
let bitcast = llvm::LLVMConstPointerCast(new_g, cx.val_ty(old_g));
llvm::LLVMReplaceAllUsesWith(old_g, bitcast);
llvm::LLVMDeleteGlobal(old_g);
}
}
// Finalize debuginfo
if cx.sess().opts.debuginfo != DebugInfo::None {
cx.debuginfo_finalize();
}
}
ModuleCodegen {
name: cgu_name.to_string(),
module_llvm: llvm_module,
kind: ModuleKind::Regular,
}
}
(module, cost)
}
pub fn set_link_section(llval: &Value, attrs: &CodegenFnAttrs) {
let Some(sect) = attrs.link_section else { return };
unsafe {
let buf = SmallCStr::new(sect.as_str());
llvm::LLVMSetSection(llval, buf.as_ptr());
}
}
pub fn linkage_to_llvm(linkage: Linkage) -> llvm::Linkage {
match linkage {
Linkage::External => llvm::Linkage::ExternalLinkage,
Linkage::AvailableExternally => llvm::Linkage::AvailableExternallyLinkage,
Linkage::LinkOnceAny => llvm::Linkage::LinkOnceAnyLinkage,
Linkage::LinkOnceODR => llvm::Linkage::LinkOnceODRLinkage,
Linkage::WeakAny => llvm::Linkage::WeakAnyLinkage,
Linkage::WeakODR => llvm::Linkage::WeakODRLinkage,
Linkage::Appending => llvm::Linkage::AppendingLinkage,
Linkage::Internal => llvm::Linkage::InternalLinkage,
Linkage::Private => llvm::Linkage::PrivateLinkage,
Linkage::ExternalWeak => llvm::Linkage::ExternalWeakLinkage,
Linkage::Common => llvm::Linkage::CommonLinkage,
}
}
pub fn visibility_to_llvm(linkage: Visibility) -> llvm::Visibility {
match linkage {
Visibility::Default => llvm::Visibility::Default,
Visibility::Hidden => llvm::Visibility::Hidden,
Visibility::Protected => llvm::Visibility::Protected,
}
}
|
