Enable the instruction printer in HexagonMCTargetDesc

This adds the MCInstPrinter to the LLVMHexagonDesc library and removes
the dependency LLVMHexagonAsmPrinter had on LLVMHexagonDesc. This is
a prerequisite needed by the disassembler.

Phabricator Revision: http://reviews.llvm.org/D5734

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219826 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Hexagon/InstPrinter/HexagonInstPrinter.cpp

@@ -29,6 +29,43 @@ using namespace llvm;
 #include "HexagonGenAsmWriter.inc"
 
 const char HexagonInstPrinter::PacketPadding = '\t';
+// Return the minimum value that a constant extendable operand can have
+// without being extended.
+static int getMinValue(uint64_t TSFlags) {
+  unsigned isSigned =
+      (TSFlags >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
+  unsigned bits =
+      (TSFlags >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
+
+  if (isSigned)
+    return -1U << (bits - 1);
+  else
+    return 0;
+}
+
+// Return the maximum value that a constant extendable operand can have
+// without being extended.
+static int getMaxValue(uint64_t TSFlags) {
+  unsigned isSigned =
+      (TSFlags >> HexagonII::ExtentSignedPos) & HexagonII::ExtentSignedMask;
+  unsigned bits =
+      (TSFlags >> HexagonII::ExtentBitsPos) & HexagonII::ExtentBitsMask;
+
+  if (isSigned)
+    return ~(-1U << (bits - 1));
+  else
+    return ~(-1U << bits);
+}
+
+// Return true if the instruction must be extended.
+static bool isExtended(uint64_t TSFlags) {
+  return (TSFlags >> HexagonII::ExtendedPos) & HexagonII::ExtendedMask;
+}
+
+// Return true if the instruction may be extended based on the operand value.
+static bool isExtendable(uint64_t TSFlags) {
+  return (TSFlags >> HexagonII::ExtendablePos) & HexagonII::ExtendableMask;
+}
 
 StringRef HexagonInstPrinter::getOpcodeName(unsigned Opcode) const {
   return MII.getName(Opcode);
@@ -116,9 +153,20 @@ void HexagonInstPrinter::printImmOperand(const MCInst *MI, unsigned OpNo,
 
 void HexagonInstPrinter::printExtOperand(const MCInst *MI, unsigned OpNo,
                                          raw_ostream &O) const {
-  const HexagonMCInst *HMCI = static_cast<const HexagonMCInst*>(MI);
-  if (HMCI->isConstExtended())
+  const MCOperand &MO = MI->getOperand(OpNo);
+  const MCInstrDesc &MII = getMII().get(MI->getOpcode());
+
+  assert((isExtendable(MII.TSFlags) || isExtended(MII.TSFlags)) &&
+         "Expecting an extendable operand");
+
+  if (MO.isExpr() || isExtended(MII.TSFlags)) {
     O << "#";
+  } else if (MO.isImm()) {
+    int ImmValue = MO.getImm();
+    if (ImmValue < getMinValue(MII.TSFlags) ||
+        ImmValue > getMaxValue(MII.TSFlags))
+      O << "#";
+  }
   printOperand(MI, OpNo, O);
 }
 

lib/Target/Hexagon/InstPrinter/LLVMBuild.txt

@@ -19,5 +19,5 @@
 type = Library
 name = HexagonAsmPrinter
 parent = Hexagon
-required_libraries = HexagonDesc MC Support
+required_libraries = MC Support
 add_to_library_groups = Hexagon

lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp

@@ -74,6 +74,14 @@ static MCCodeGenInfo *createHexagonMCCodeGenInfo(StringRef TT, Reloc::Model RM,
   X->InitMCCodeGenInfo(Reloc::Static, CM, OL);
   return X;
 }
+static MCInstPrinter *createHexagonMCInstPrinter(const Target &T,
+                                                 unsigned SyntaxVariant,
+                                                 const MCAsmInfo &MAI,
+                                                 const MCInstrInfo &MII,
+                                                 const MCRegisterInfo &MRI,
+                                                 const MCSubtargetInfo &STI) {
+    return new HexagonInstPrinter(MAI, MII, MRI);
+}
 
 // Force static initialization.
 extern "C" void LLVMInitializeHexagonTargetMC() {
@@ -99,4 +107,8 @@ extern "C" void LLVMInitializeHexagonTargetMC() {
   // Register the MC Code Emitter
   TargetRegistry::RegisterMCCodeEmitter(TheHexagonTarget,
                                         createHexagonMCCodeEmitter);
+
+  // Register the MC Inst Printer
+  TargetRegistry::RegisterMCInstPrinter(TheHexagonTarget,
+                                        createHexagonMCInstPrinter);
 }

lib/Target/Hexagon/MCTargetDesc/LLVMBuild.txt

@@ -19,5 +19,5 @@
 type = Library
 name = HexagonDesc
 parent = Hexagon
-required_libraries = HexagonInfo MC Support
+required_libraries = HexagonAsmPrinter HexagonInfo MC Support
 add_to_library_groups = Hexagon