[PATCH] D75094: [MachineInstr] Add a dumpr method

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet created this revision.
qcolombet added reviewers: dsanders, volkan, arsenm, aditya_nandakumar, aemerson, paquette.
Herald added subscribers: hiraditya, wdng.
Herald added a project: LLVM.

Add a dump method that recursively prints an instruction and all
the instructions defining its operands and so on.

This is helpful when looking at combiner issue.

NFC


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D75094

Files:
  llvm/include/llvm/CodeGen/MachineInstr.h
  llvm/lib/CodeGen/MachineInstr.cpp


Index: llvm/lib/CodeGen/MachineInstr.cpp
===================================================================
--- llvm/lib/CodeGen/MachineInstr.cpp
+++ llvm/lib/CodeGen/MachineInstr.cpp
@@ -1463,6 +1463,32 @@
   dbgs() << "  ";
   print(dbgs());
 }
+
+LLVM_DUMP_METHOD void MachineInstr::dumprImpl(
+    const MachineRegisterInfo &MRI, unsigned Depth, Optional<unsigned> MaxDepth,
+    SmallPtrSetImpl<const MachineInstr *> &AlreadySeenInstrs) const {
+  if (MaxDepth && Depth >= *MaxDepth)
+    return;
+  if (!AlreadySeenInstrs.insert(this).second)
+    return;
+  std::string Prefix;
+  for (unsigned i = 0; i != Depth; ++i)
+    Prefix += "  ";
+  dbgs() << Prefix;
+  dump();
+  for (const MachineOperand &MO : operands()) {
+    const MachineInstr *NewMI;
+    if (!MO.isReg() || MO.isDef() || !(NewMI = MRI.getVRegDef(MO.getReg())))
+      continue;
+    NewMI->dumprImpl(MRI, Depth + 1, MaxDepth, AlreadySeenInstrs);
+  }
+}
+
+LLVM_DUMP_METHOD void MachineInstr::dumpr(const MachineRegisterInfo &MRI,
+                                          Optional<unsigned> MaxDepth) const {
+  SmallPtrSet<const MachineInstr *, 16> AlreadySeenInstrs;
+  dumprImpl(MRI, 0, MaxDepth, AlreadySeenInstrs);
+}
 #endif
 
 void MachineInstr::print(raw_ostream &OS, bool IsStandalone, bool SkipOpers,
Index: llvm/include/llvm/CodeGen/MachineInstr.h
===================================================================
--- llvm/include/llvm/CodeGen/MachineInstr.h
+++ llvm/include/llvm/CodeGen/MachineInstr.h
@@ -262,6 +262,11 @@
   // MachineInstrs are pool-allocated and owned by MachineFunction.
   friend class MachineFunction;
 
+  void
+  dumprImpl(const MachineRegisterInfo &MRI, unsigned Depth,
+            Optional<unsigned> MaxDepth,
+            SmallPtrSetImpl<const MachineInstr *> &AlreadySeenInstrs) const;
+
 public:
   MachineInstr(const MachineInstr &) = delete;
   MachineInstr &operator=(const MachineInstr &) = delete;
@@ -1534,6 +1539,10 @@
              bool AddNewLine = true,
              const TargetInstrInfo *TII = nullptr) const;
   void dump() const;
+  /// Print on dbgs() the current instruction and the instructions defining its
+  /// operands and so on until we reach \p MaxDepth.
+  void dumpr(const MachineRegisterInfo &MRI,
+             Optional<unsigned> MaxDepth = None) const;
   /// @}
 
   //===--------------------------------------------------------------------===//


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