[Instrumentation] Support verifying machine function (#90931)

We need it to test isel related passes. Currently
`verifyMachineFunction` is incomplete (no LiveIntervals support), but is
enough for testing isel pass, will migrate to complete
`MachineVerifierPass` in future.

Author: paperchalice

llvm/include/llvm/Passes/MachinePassRegistry.def

@@ -128,6 +128,7 @@ MACHINE_FUNCTION_PASS("no-op-machine-function", NoOpMachineFunctionPass())
 MACHINE_FUNCTION_PASS("print", PrintMIRPass())
 MACHINE_FUNCTION_PASS("require-all-machine-function-properties",
                       RequireAllMachineFunctionPropertiesPass())
+MACHINE_FUNCTION_PASS("trigger-verifier-error", TriggerVerifierErrorPass())
 #undef MACHINE_FUNCTION_PASS
 
 // After a pass is converted to new pass manager, its entry should be moved from

llvm/lib/Passes/PassBuilder.cpp

@@ -93,6 +93,7 @@
 #include "llvm/CodeGen/MIRPrinter.h"
 #include "llvm/CodeGen/MachineFunctionAnalysis.h"
 #include "llvm/CodeGen/MachinePassManager.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/PreISelIntrinsicLowering.h"
 #include "llvm/CodeGen/SafeStack.h"
 #include "llvm/CodeGen/SelectOptimize.h"
@@ -363,6 +364,14 @@ class TriggerVerifierErrorPass
     return PreservedAnalyses::none();
   }
 
+  PreservedAnalyses run(MachineFunction &MF, MachineFunctionAnalysisManager &) {
+    // Intentionally create a virtual register and set NoVRegs property.
+    auto &MRI = MF.getRegInfo();
+    MRI.createGenericVirtualRegister(LLT::scalar(8));
+    MF.getProperties().set(MachineFunctionProperties::Property::NoVRegs);
+    return PreservedAnalyses::all();
+  }
+
   static StringRef name() { return "TriggerVerifierErrorPass"; }
 };
 

llvm/lib/Passes/StandardInstrumentations.cpp

@@ -1487,6 +1487,17 @@ void VerifyInstrumentation::registerCallbacks(
                                          "\"{0}\", compilation aborted!",
                                          P));
           }
+
+          // TODO: Use complete MachineVerifierPass.
+          if (auto *MF = unwrapIR<MachineFunction>(IR)) {
+            if (DebugLogging)
+              dbgs() << "Verifying machine function " << MF->getName() << '\n';
+            verifyMachineFunction(
+                formatv("Broken machine function found after pass "
+                        "\"{0}\", compilation aborted!",
+                        P),
+                *MF);
+          }
         }
       });
 }

llvm/test/CodeGen/MIR/X86/machine-verifier.mir

@@ -1,5 +1,5 @@
 # RUN: not --crash llc -march=x86-64 -run-pass none -o /dev/null %s 2>&1 | FileCheck %s
-# This test ensures that the MIR parser runs the machine verifier after parsing.
+# This test ensures that the VerifyInstrumentation works for machine function.
 
 --- |
 

llvm/test/tools/llc/new-pm/verify.mir

@@ -0,0 +1,10 @@
+# RUN: not --crash llc -mtriple=x86_64-pc-linux-gnu -debug-pass-manager -passes='module(function(machine-function(trigger-verifier-error)))' -filetype=null %s 2>&1 | FileCheck %s
+
+# CHECK: Verifying machine function f
+# CHECK: Broken machine function found after pass "TriggerVerifierErrorPass"
+---
+name: f
+body: |
+  bb.0:
+    RET 0
+...

llvm/tools/llc/NewPMDriver.cpp

@@ -115,7 +115,7 @@ int llvm::compileModuleWithNewPM(
   MachineModuleInfo MMI(&LLVMTM);
 
   PassInstrumentationCallbacks PIC;
-  StandardInstrumentations SI(Context, Opt.DebugPM);
+  StandardInstrumentations SI(Context, Opt.DebugPM, !NoVerify);
   SI.registerCallbacks(PIC);
   registerCodeGenCallback(PIC, LLVMTM);