Auto merge of rust-lang#133499 - nikic:no-backend-verify, r=Mark-Simulacrum

Respect verify-llvm-ir option in the backend

We are currently unconditionally verifying the LLVM IR in the backend (twice), ignoring the value of the verify-llvm-ir option. This has substantial compile-time impact for debug builds.

Author: bors

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -61,6 +61,7 @@ fn write_output_file<'ll>(
     dwo_output: Option<&Path>,
     file_type: llvm::FileType,
     self_profiler_ref: &SelfProfilerRef,
+    verify_llvm_ir: bool,
 ) -> Result<(), FatalError> {
     debug!("write_output_file output={:?} dwo_output={:?}", output, dwo_output);
     unsafe {
@@ -79,6 +80,7 @@ fn write_output_file<'ll>(
             output_c.as_ptr(),
             dwo_output_ptr,
             file_type,
+            verify_llvm_ir,
         );
 
         // Record artifact sizes for self-profiling
@@ -840,6 +842,7 @@ pub(crate) unsafe fn codegen(
                         None,
                         llvm::FileType::AssemblyFile,
                         &cgcx.prof,
+                        config.verify_llvm_ir,
                     )
                 })?;
             }
@@ -877,6 +880,7 @@ pub(crate) unsafe fn codegen(
                             dwo_out,
                             llvm::FileType::ObjectFile,
                             &cgcx.prof,
+                            config.verify_llvm_ir,
                         )
                     })?;
                 }

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -2240,6 +2240,7 @@ unsafe extern "C" {
         Output: *const c_char,
         DwoOutput: *const c_char,
         FileType: FileType,
+        VerifyIR: bool,
     ) -> LLVMRustResult;
     pub fn LLVMRustOptimize<'a>(
         M: &'a Module,

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -552,7 +552,7 @@ static CodeGenFileType fromRust(LLVMRustFileType Type) {
 extern "C" LLVMRustResult
 LLVMRustWriteOutputFile(LLVMTargetMachineRef Target, LLVMPassManagerRef PMR,
                         LLVMModuleRef M, const char *Path, const char *DwoPath,
-                        LLVMRustFileType RustFileType) {
+                        LLVMRustFileType RustFileType, bool VerifyIR) {
   llvm::legacy::PassManager *PM = unwrap<llvm::legacy::PassManager>(PMR);
   auto FileType = fromRust(RustFileType);
 
@@ -577,10 +577,10 @@ LLVMRustWriteOutputFile(LLVMTargetMachineRef Target, LLVMPassManagerRef PMR,
       return LLVMRustResult::Failure;
     }
     auto DBOS = buffer_ostream(DOS);
-    unwrap(Target)->addPassesToEmitFile(*PM, BOS, &DBOS, FileType, false);
+    unwrap(Target)->addPassesToEmitFile(*PM, BOS, &DBOS, FileType, !VerifyIR);
     PM->run(*unwrap(M));
   } else {
-    unwrap(Target)->addPassesToEmitFile(*PM, BOS, nullptr, FileType, false);
+    unwrap(Target)->addPassesToEmitFile(*PM, BOS, nullptr, FileType, !VerifyIR);
     PM->run(*unwrap(M));
   }
 

tests/crashes/109681.rs

@@ -1,4 +1,4 @@
-//@ compile-flags: -g -Copt-level=0
+//@ compile-flags: -g -Copt-level=0 -Z verify-llvm-ir
 //@ known-bug: #34127
 //@ only-x86_64
 

tests/crashes/34127.rs

@@ -2,6 +2,7 @@
 //@ failure-status: 101
 //@ known-bug: #109681
 //@ ignore-wasm32 this appears to SIGABRT on wasm, not fail cleanly
+//@ compile-flags: -Z verify-llvm-ir
 
 // This test verifies that we continue to hit the LLVM error for common linkage with non-zero
 // initializers, since it generates invalid LLVM IR.