MIR Serialization: Serialize the operand's bit mask target flags.

This commit adds support for bit mask target flag serialization to the MIR
printer and the MIR parser. It also adds support for the machine operand's
target flag serialization to the AArch64 target.

Reviewers: Duncan P. N. Exon Smith
llvm-svn: 245383

2 files changed, 84 insertions, 9 deletions

diff --git a/llvm/lib/CodeGen/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index 557b72596f8..20581a1692f 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -72,6 +72,8 @@ class MIParser {
   StringMap<int> Names2TargetIndices;
   /// Maps from direct target flag names to the direct target flag values.
   StringMap<unsigned> Names2DirectTargetFlags;
+  /// Maps from direct target flag names to the bitmask target flag values.
+  StringMap<unsigned> Names2BitmaskTargetFlags;
 
 public:
   MIParser(SourceMgr &SM, MachineFunction &MF, SMDiagnostic &Error,
@@ -211,6 +213,14 @@ private:
   ///
   /// Return true if the name isn't a name of a direct flag.
   bool getDirectTargetFlag(StringRef Name, unsigned &Flag);
+
+  void initNames2BitmaskTargetFlags();
+
+  /// Try to convert a name of a bitmask target flag to the corresponding
+  /// target flag.
+  ///
+  /// Return true if the name isn't a name of a bitmask target flag.
+  bool getBitmaskTargetFlag(StringRef Name, unsigned &Flag);
 };
 
 } // end anonymous namespace
@@ -1351,11 +1361,24 @@ bool MIParser::parseMachineOperandAndTargetFlags(MachineOperand &Dest) {
       return true;
     if (Token.isNot(MIToken::Identifier))
       return error("expected the name of the target flag");
-    if (getDirectTargetFlag(Token.stringValue(), TF))
-      return error("use of undefined target flag '" + Token.stringValue() +
-                   "'");
+    if (getDirectTargetFlag(Token.stringValue(), TF)) {
+      if (getBitmaskTargetFlag(Token.stringValue(), TF))
+        return error("use of undefined target flag '" + Token.stringValue() +
+                     "'");
+    }
     lex();
-    // TODO: Parse target's bit target flags.
+    while (Token.is(MIToken::comma)) {
+      lex();
+      if (Token.isNot(MIToken::Identifier))
+        return error("expected the name of the target flag");
+      unsigned BitFlag = 0;
+      if (getBitmaskTargetFlag(Token.stringValue(), BitFlag))
+        return error("use of undefined target flag '" + Token.stringValue() +
+                     "'");
+      // TODO: Report an error when using a duplicate bit target flag.
+      TF |= BitFlag;
+      lex();
+    }
     if (expectAndConsume(MIToken::rparen))
       return true;
   }
@@ -1759,6 +1782,26 @@ bool MIParser::getDirectTargetFlag(StringRef Name, unsigned &Flag) {
   return false;
 }
 
+void MIParser::initNames2BitmaskTargetFlags() {
+  if (!Names2BitmaskTargetFlags.empty())
+    return;
+  const auto *TII = MF.getSubtarget().getInstrInfo();
+  assert(TII && "Expected target instruction info");
+  auto Flags = TII->getSerializableBitmaskMachineOperandTargetFlags();
+  for (const auto &I : Flags)
+    Names2BitmaskTargetFlags.insert(
+        std::make_pair(StringRef(I.second), I.first));
+}
+
+bool MIParser::getBitmaskTargetFlag(StringRef Name, unsigned &Flag) {
+  initNames2BitmaskTargetFlags();
+  auto FlagInfo = Names2BitmaskTargetFlags.find(Name);
+  if (FlagInfo == Names2BitmaskTargetFlags.end())
+    return true;
+  Flag = FlagInfo->second;
+  return false;
+}
+
 bool llvm::parseMachineBasicBlockDefinitions(MachineFunction &MF, StringRef Src,
                                              PerFunctionMIParsingState &PFS,
                                              const SlotMapping &IRSlots,
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
index 9e3f6bb65f6..67fd5c226a5 100644
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -611,11 +611,43 @@ void MIPrinter::printTargetFlags(const MachineOperand &Op) {
   assert(TII && "expected instruction info");
   auto Flags = TII->decomposeMachineOperandsTargetFlags(Op.getTargetFlags());
   OS << "target-flags(";
-  if (const auto *Name = getTargetFlagName(TII, Flags.first))
-    OS << Name;
-  else
-    OS << "<unknown target flag>";
-  // TODO: Print the target's bit flags.
+  const bool HasDirectFlags = Flags.first;
+  const bool HasBitmaskFlags = Flags.second;
+  if (!HasDirectFlags && !HasBitmaskFlags) {
+    OS << "<unknown>) ";
+    return;
+  }
+  if (HasDirectFlags) {
+    if (const auto *Name = getTargetFlagName(TII, Flags.first))
+      OS << Name;
+    else
+      OS << "<unknown target flag>";
+  }
+  if (!HasBitmaskFlags) {
+    OS << ") ";
+    return;
+  }
+  bool IsCommaNeeded = HasDirectFlags;
+  unsigned BitMask = Flags.second;
+  auto BitMasks = TII->getSerializableBitmaskMachineOperandTargetFlags();
+  for (const auto &Mask : BitMasks) {
+    // Check if the flag's bitmask has the bits of the current mask set.
+    if ((BitMask & Mask.first) == Mask.first) {
+      if (IsCommaNeeded)
+        OS << ", ";
+      IsCommaNeeded = true;
+      OS << Mask.second;
+      // Clear the bits which were serialized from the flag's bitmask.
+      BitMask &= ~(Mask.first);
+    }
+  }
+  if (BitMask) {
+    // When the resulting flag's bitmask isn't zero, we know that we didn't
+    // serialize all of the bit flags.
+    if (IsCommaNeeded)
+      OS << ", ";
+    OS << "<unknown bitmask target flag>";
+  }
   OS << ") ";
 }