From f3630113cd93f3b25b48d892058025213f1faa93 Mon Sep 17 00:00:00 2001
From: Alex Lorenz <arphaman@gmail.com>
Date: Tue, 18 Aug 2015 22:52:15 +0000
Subject: 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
---
 llvm/lib/CodeGen/MIRParser/MIParser.cpp | 51 ++++++++++++++++++++++++++++++---
 1 file changed, 47 insertions(+), 4 deletions(-)

(limited to 'llvm/lib/CodeGen/MIRParser/MIParser.cpp')

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,
-- 
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