Remove enable_verifier from BackendConfig

Author: bjorn3

src/base.rs

@@ -14,9 +14,9 @@ use rustc_middle::ty::adjustment::PointerCoercion;
 use rustc_middle::ty::layout::{FnAbiOf, HasTypingEnv};
 use rustc_middle::ty::print::with_no_trimmed_paths;
 
-use crate::BackendConfig;
 use crate::constant::ConstantCx;
 use crate::debuginfo::{FunctionDebugContext, TypeDebugContext};
+use crate::enable_verifier;
 use crate::inline_asm::codegen_naked_asm;
 use crate::prelude::*;
 use crate::pretty_clif::CommentWriter;
@@ -31,7 +31,6 @@ pub(crate) struct CodegenedFunction {
 
 pub(crate) fn codegen_fn<'tcx>(
     tcx: TyCtxt<'tcx>,
-    backend_config: &BackendConfig,
     cx: &mut crate::CodegenCx,
     type_dbg: &mut TypeDebugContext<'tcx>,
     cached_func: Function,
@@ -164,7 +163,7 @@ pub(crate) fn codegen_fn<'tcx>(
     }
 
     // Verify function
-    verify_func(tcx, backend_config, &clif_comments, &func);
+    verify_func(tcx, &clif_comments, &func);
 
     Some(CodegenedFunction { symbol_name, func_id, func, clif_comments, func_debug_cx })
 }
@@ -266,13 +265,8 @@ pub(crate) fn compile_fn(
     });
 }
 
-fn verify_func(
-    tcx: TyCtxt<'_>,
-    backend_config: &BackendConfig,
-    writer: &crate::pretty_clif::CommentWriter,
-    func: &Function,
-) {
-    if !tcx.sess.verify_llvm_ir() && !backend_config.enable_verifier {
+fn verify_func(tcx: TyCtxt<'_>, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
+    if !enable_verifier(tcx.sess) {
         return;
     }
 

src/config.rs

@@ -42,14 +42,6 @@ pub struct BackendConfig {
     /// Defaults to the value of `CG_CLIF_JIT_ARGS`.
     pub jit_args: Vec<String>,
 
-    /// Enable the Cranelift ir verifier for all compilation passes. If not set it will only run
-    /// once before passing the clif ir to Cranelift for compilation.
-    ///
-    /// Defaults to true when the `CG_CLIF_ENABLE_VERIFIER` env var is set to 1 or when cg_clif is
-    /// compiled with debug assertions enabled or false otherwise. Can be set using
-    /// `-Cllvm-args=enable_verifier=...`.
-    pub enable_verifier: bool,
-
     /// Don't cache object files in the incremental cache. Useful during development of cg_clif
     /// to make it possible to use incremental mode for all analyses performed by rustc without
     /// caching object files when their content should have been changed by a change to cg_clif.
@@ -72,7 +64,6 @@ impl Default for BackendConfig {
                     }
                 }
             },
-            enable_verifier: cfg!(debug_assertions) || bool_env_var("CG_CLIF_ENABLE_VERIFIER"),
             disable_incr_cache: bool_env_var("CG_CLIF_DISABLE_INCR_CACHE"),
         }
     }
@@ -95,7 +86,6 @@ impl BackendConfig {
             if let Some((name, value)) = opt.split_once('=') {
                 match name {
                     "mode" => config.codegen_mode = value.parse()?,
-                    "enable_verifier" => config.enable_verifier = parse_bool(name, value)?,
                     "disable_incr_cache" => config.disable_incr_cache = parse_bool(name, value)?,
                     _ => return Err(format!("Unknown option `{}`", name)),
                 }

src/driver/aot.rs

@@ -322,12 +322,8 @@ fn produce_final_output_artifacts(
     // These are used in linking steps and will be cleaned up afterward.
 }
 
-fn make_module(
-    sess: &Session,
-    backend_config: &BackendConfig,
-    name: String,
-) -> UnwindModule<ObjectModule> {
-    let isa = crate::build_isa(sess, backend_config);
+fn make_module(sess: &Session, name: String) -> UnwindModule<ObjectModule> {
+    let isa = crate::build_isa(sess);
 
     let mut builder =
         ObjectBuilder::new(isa, name + ".o", cranelift_module::default_libcall_names()).unwrap();
@@ -488,8 +484,7 @@ fn reuse_workproduct_for_cgu(
 
 fn module_codegen(
     tcx: TyCtxt<'_>,
-    (backend_config, global_asm_config, cgu_name, token): (
-        BackendConfig,
+    (global_asm_config, cgu_name, token): (
         Arc<GlobalAsmConfig>,
         rustc_span::Symbol,
         ConcurrencyLimiterToken,
@@ -500,7 +495,7 @@ fn module_codegen(
             let cgu = tcx.codegen_unit(cgu_name);
             let mono_items = cgu.items_in_deterministic_order(tcx);
 
-            let mut module = make_module(tcx.sess, &backend_config, cgu_name.as_str().to_string());
+            let mut module = make_module(tcx.sess, cgu_name.as_str().to_string());
 
             let mut cx = crate::CodegenCx::new(
                 tcx,
@@ -516,7 +511,6 @@ fn module_codegen(
                     MonoItem::Fn(inst) => {
                         if let Some(codegened_function) = crate::base::codegen_fn(
                             tcx,
-                            &backend_config,
                             &mut cx,
                             &mut type_dbg,
                             Function::new(),
@@ -648,12 +642,7 @@ pub(crate) fn run_aot(
                 .with_task(
                     dep_node,
                     tcx,
-                    (
-                        backend_config.clone(),
-                        global_asm_config.clone(),
-                        cgu.name(),
-                        concurrency_limiter.acquire(tcx.dcx()),
-                    ),
+                    (global_asm_config.clone(), cgu.name(), concurrency_limiter.acquire(tcx.dcx())),
                     module_codegen,
                     Some(rustc_middle::dep_graph::hash_result),
                 )
@@ -667,7 +656,7 @@ pub(crate) fn run_aot(
         modules
     });
 
-    let mut allocator_module = make_module(tcx.sess, &backend_config, "allocator_shim".to_string());
+    let mut allocator_module = make_module(tcx.sess, "allocator_shim".to_string());
     let created_alloc_shim = crate::allocator::codegen(tcx, &mut allocator_module);
 
     let allocator_module = if created_alloc_shim {

src/driver/jit.rs

@@ -20,7 +20,6 @@ use crate::{BackendConfig, CodegenCx, CodegenMode};
 
 struct JitState {
     jit_module: UnwindModule<JITModule>,
-    backend_config: BackendConfig,
 }
 
 thread_local! {
@@ -60,14 +59,10 @@ impl UnsafeMessage {
     }
 }
 
-fn create_jit_module(
-    tcx: TyCtxt<'_>,
-    backend_config: &BackendConfig,
-    hotswap: bool,
-) -> (UnwindModule<JITModule>, CodegenCx) {
+fn create_jit_module(tcx: TyCtxt<'_>, hotswap: bool) -> (UnwindModule<JITModule>, CodegenCx) {
     let crate_info = CrateInfo::new(tcx, "dummy_target_cpu".to_string());
 
-    let isa = crate::build_isa(tcx.sess, backend_config);
+    let isa = crate::build_isa(tcx.sess);
     let mut jit_builder = JITBuilder::with_isa(isa, cranelift_module::default_libcall_names());
     jit_builder.hotswap(hotswap);
     crate::compiler_builtins::register_functions_for_jit(&mut jit_builder);
@@ -91,11 +86,8 @@ pub(crate) fn run_jit(tcx: TyCtxt<'_>, backend_config: BackendConfig) -> ! {
         tcx.dcx().fatal("can't jit non-executable crate");
     }
 
-    let (mut jit_module, mut cx) = create_jit_module(
-        tcx,
-        &backend_config,
-        matches!(backend_config.codegen_mode, CodegenMode::JitLazy),
-    );
+    let (mut jit_module, mut cx) =
+        create_jit_module(tcx, matches!(backend_config.codegen_mode, CodegenMode::JitLazy));
     let mut cached_context = Context::new();
 
     let (_, cgus) = tcx.collect_and_partition_mono_items(());
@@ -116,7 +108,6 @@ pub(crate) fn run_jit(tcx: TyCtxt<'_>, backend_config: BackendConfig) -> ! {
                     CodegenMode::Jit => {
                         codegen_and_compile_fn(
                             tcx,
-                            &backend_config,
                             &mut cx,
                             &mut cached_context,
                             &mut jit_module,
@@ -171,7 +162,7 @@ pub(crate) fn run_jit(tcx: TyCtxt<'_>, backend_config: BackendConfig) -> ! {
     LAZY_JIT_STATE.with(|lazy_jit_state| {
         let mut lazy_jit_state = lazy_jit_state.borrow_mut();
         assert!(lazy_jit_state.is_none());
-        *lazy_jit_state = Some(JitState { jit_module, backend_config });
+        *lazy_jit_state = Some(JitState { jit_module });
     });
 
     let f: extern "C" fn(c_int, *const *const c_char) -> c_int =
@@ -207,7 +198,6 @@ pub(crate) fn run_jit(tcx: TyCtxt<'_>, backend_config: BackendConfig) -> ! {
 
 pub(crate) fn codegen_and_compile_fn<'tcx>(
     tcx: TyCtxt<'tcx>,
-    backend_config: &BackendConfig,
     cx: &mut crate::CodegenCx,
     cached_context: &mut Context,
     module: &mut dyn Module,
@@ -224,7 +214,6 @@ pub(crate) fn codegen_and_compile_fn<'tcx>(
         let cached_func = std::mem::replace(&mut cached_context.func, Function::new());
         if let Some(codegened_func) = crate::base::codegen_fn(
             tcx,
-            &backend_config,
             cx,
             &mut TypeDebugContext::default(),
             cached_func,
@@ -286,14 +275,7 @@ fn jit_fn(instance_ptr: *const Instance<'static>, trampoline_ptr: *const u8) ->
                 false,
                 Symbol::intern("dummy_cgu_name"),
             );
-            codegen_and_compile_fn(
-                tcx,
-                &lazy_jit_state.backend_config,
-                &mut cx,
-                &mut Context::new(),
-                jit_module,
-                instance,
-            );
+            codegen_and_compile_fn(tcx, &mut cx, &mut Context::new(), jit_module, instance);
 
             assert!(cx.global_asm.is_empty());
             jit_module.finalize_definitions();

src/lib.rs

@@ -35,6 +35,7 @@ extern crate rustc_driver;
 
 use std::any::Any;
 use std::cell::{Cell, RefCell};
+use std::env;
 use std::sync::Arc;
 
 use cranelift_codegen::isa::TargetIsa;
@@ -249,6 +250,16 @@ impl CodegenBackend for CraneliftCodegenBackend {
     }
 }
 
+/// Determine if the Cranelift ir verifier should run.
+///
+/// Returns true when `-Zverify-llvm-ir` is passed, the `CG_CLIF_ENABLE_VERIFIER` env var is set to
+/// 1 or when cg_clif is compiled with debug assertions enabled or false otherwise.
+fn enable_verifier(sess: &Session) -> bool {
+    sess.verify_llvm_ir()
+        || cfg!(debug_assertions)
+        || env::var("CG_CLIF_ENABLE_VERIFIER").as_deref() == Ok("1")
+}
+
 fn target_triple(sess: &Session) -> target_lexicon::Triple {
     // FIXME(madsmtm): Use `sess.target.llvm_target` once target-lexicon supports unversioned macOS.
     // See <https://github.com/bytecodealliance/target-lexicon/pull/113>
@@ -258,15 +269,14 @@ fn target_triple(sess: &Session) -> target_lexicon::Triple {
     }
 }
 
-fn build_isa(sess: &Session, backend_config: &BackendConfig) -> Arc<dyn TargetIsa + 'static> {
+fn build_isa(sess: &Session) -> Arc<dyn TargetIsa + 'static> {
     use target_lexicon::BinaryFormat;
 
     let target_triple = crate::target_triple(sess);
 
     let mut flags_builder = settings::builder();
     flags_builder.enable("is_pic").unwrap();
-    let enable_verifier =
-        if sess.verify_llvm_ir() || backend_config.enable_verifier { "true" } else { "false" };
+    let enable_verifier = if enable_verifier(sess) { "true" } else { "false" };
     flags_builder.set("enable_verifier", enable_verifier).unwrap();
     flags_builder.set("regalloc_checker", enable_verifier).unwrap();