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Reuse determine_cgu_reuse from cg_ssa in cg_clif

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This commit is contained in:
bjorn3 2023-09-16 14:36:23 +00:00
parent 5d85a24442
commit ed2f5baba6
1 changed files with 1 additions and 29 deletions
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30
src/driver/aot.rs
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@ -8,6 +8,7 @@
use cranelift_object::{ObjectBuilder, ObjectModule};
use rustc_codegen_ssa::back::metadata::create_compressed_metadata_file;
use rustc_codegen_ssa::base::determine_cgu_reuse;
use rustc_codegen_ssa::{CodegenResults, CompiledModule, CrateInfo, ModuleKind};
use rustc_data_structures::profiling::SelfProfilerRef;
use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
@ -489,32 +490,3 @@ pub(crate) fn run_aot(
concurrency_limiter,
})
}
// Adapted from https://github.com/rust-lang/rust/blob/303d8aff6092709edd4dbd35b1c88e9aa40bf6d8/src/librustc_codegen_ssa/base.rs#L922-L953
fn determine_cgu_reuse<'tcx>(tcx: TyCtxt<'tcx>, cgu: &CodegenUnit<'tcx>) -> CguReuse {
if !tcx.dep_graph.is_fully_enabled() {
return CguReuse::No;
}
let work_product_id = &cgu.work_product_id();
if tcx.dep_graph.previous_work_product(work_product_id).is_none() {
// We don't have anything cached for this CGU. This can happen
// if the CGU did not exist in the previous session.
return CguReuse::No;
}
// Try to mark the CGU as green. If it we can do so, it means that nothing
// affecting the LLVM module has changed and we can re-use a cached version.
// If we compile with any kind of LTO, this means we can re-use the bitcode
// of the Pre-LTO stage (possibly also the Post-LTO version but we'll only
// know that later). If we are not doing LTO, there is only one optimized
// version of each module, so we re-use that.
let dep_node = cgu.codegen_dep_node(tcx);
assert!(
!tcx.dep_graph.dep_node_exists(&dep_node),
"CompileCodegenUnit dep-node for CGU `{}` already exists before marking.",
cgu.name()
);
if tcx.try_mark_green(&dep_node) { CguReuse::PostLto } else { CguReuse::No }
}