TableGen: Add -gen-register-info-debug-dump

Adds a new --gen-register-info-debug-dump mode to tablegen that dumps various register related information:

- List of register classes with super and subclasses
- List of subregister indexes with lanemasks
- List of registers with subregisters

I will use this in an upcoming commit to create a test.

It may also be useful for target developers wanting to get an overview
of all the register related information, esp. the things inferred by
tablegen and not directly visible in the .td file.

Differential Revision: https://reviews.llvm.org/D36911

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311913 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index bebb1a183fc76595617a4f0f07253499b7afac79..410b3d9590e5d0809b40f126e05679169e375685 100644 (file)
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -26,6 +26,7 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/CodeGen/MachineValueType.h"
 #include "llvm/Support/Casting.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/TableGen/Error.h"
@@ -44,13 +45,24 @@
 
 using namespace llvm;
 
+cl::OptionCategory RegisterInfoCat("Options for -gen-register-info");
+
+static cl::opt<bool>
+    RegisterInfoDebug("register-info-debug", cl::init(false),
+                      cl::desc("Dump register information to help debugging"),
+                      cl::cat(RegisterInfoCat));
+
 namespace {
 
 class RegisterInfoEmitter {
+  CodeGenTarget Target;
   RecordKeeper &Records;
 
 public:
-  RegisterInfoEmitter(RecordKeeper &R) : Records(R) {}
+  RegisterInfoEmitter(RecordKeeper &R) : Target(R), Records(R) {
+    CodeGenRegBank &RegBank = Target.getRegBank();
+    RegBank.computeDerivedInfo();
+  }
 
   // runEnums - Print out enum values for all of the registers.
   void runEnums(raw_ostream &o, CodeGenTarget &Target, CodeGenRegBank &Bank);
@@ -69,6 +81,8 @@ public:
   // run - Output the register file description.
   void run(raw_ostream &o);
 
+  void debugDump(raw_ostream &OS);
+
 private:
   void EmitRegMapping(raw_ostream &o, const std::deque<CodeGenRegister> &Regs,
                       bool isCtor);
@@ -1521,14 +1535,63 @@ RegisterInfoEmitter::runTargetDesc(raw_ostream &OS, CodeGenTarget &Target,
 }
 
 void RegisterInfoEmitter::run(raw_ostream &OS) {
-  CodeGenTarget Target(Records);
   CodeGenRegBank &RegBank = Target.getRegBank();
-  RegBank.computeDerivedInfo();
-
   runEnums(OS, Target, RegBank);
   runMCDesc(OS, Target, RegBank);
   runTargetHeader(OS, Target, RegBank);
   runTargetDesc(OS, Target, RegBank);
+
+  if (RegisterInfoDebug)
+    debugDump(errs());
+}
+
+void RegisterInfoEmitter::debugDump(raw_ostream &OS) {
+  CodeGenRegBank &RegBank = Target.getRegBank();
+
+  for (const CodeGenRegisterClass &RC : RegBank.getRegClasses()) {
+    OS << "RegisterClass " << RC.getName() << ":\n";
+    OS << "\tSpillSize: " << RC.SpillSize << '\n';
+    OS << "\tSpillAlignment: " << RC.SpillAlignment << '\n';
+    OS << "\tNumRegs: " << RC.getMembers().size() << '\n';
+    OS << "\tLaneMask: " << PrintLaneMask(RC.LaneMask) << '\n';
+    OS << "\tHasDisjunctSubRegs: " << RC.HasDisjunctSubRegs << '\n';
+    OS << "\tCoveredBySubRegs: " << RC.CoveredBySubRegs << '\n';
+    OS << "\tRegs:";
+    for (const CodeGenRegister *R : RC.getMembers()) {
+      OS << " " << R->getName();
+    }
+    OS << '\n';
+    OS << "\tSubClasses:";
+    const BitVector &SubClasses = RC.getSubClasses();
+    for (const CodeGenRegisterClass &SRC : RegBank.getRegClasses()) {
+      if (!SubClasses.test(SRC.EnumValue))
+        continue;
+      OS << " " << SRC.getName();
+    }
+    OS << '\n';
+    OS << "\tSuperClasses:";
+    for (const CodeGenRegisterClass *SRC : RC.getSuperClasses()) {
+      OS << " " << SRC->getName();
+    }
+    OS << '\n';
+  }
+
+  for (const CodeGenSubRegIndex &SRI : RegBank.getSubRegIndices()) {
+    OS << "SubRegIndex " << SRI.getName() << ":\n";
+    OS << "\tLaneMask: " << PrintLaneMask(SRI.LaneMask) << '\n';
+    OS << "\tAllSuperRegsCovered: " << SRI.AllSuperRegsCovered << '\n';
+  }
+
+  for (const CodeGenRegister &R : RegBank.getRegisters()) {
+    OS << "Register " << R.getName() << ":\n";
+    OS << "\tCostPerUse: " << R.CostPerUse << '\n';
+    OS << "\tCoveredBySubregs: " << R.CoveredBySubRegs << '\n';
+    OS << "\tHasDisjunctSubRegs: " << R.HasDisjunctSubRegs << '\n';
+    for (std::pair<CodeGenSubRegIndex*,CodeGenRegister*> P : R.getSubRegs()) {
+      OS << "\tSubReg " << P.first->getName()
+         << " = " << P.second->getName() << '\n';
+    }
+  }
 }
 
 namespace llvm {