Per PR 6219, factored AsmWriterInst and AsmWriterOperand

out of the AsmWriterEmitter.  This patch does the physical
code movement, but leaves the implementation unchanged. I'll
make any changes necessary to generalize the code in a
separate patch.

llvm-svn: 95697

1 files changed, 104 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/AsmWriterInst.h b/llvm/utils/TableGen/AsmWriterInst.h
new file mode 100644
index 00000000000..7ea69ce27bd
--- /dev/null
+++ b/llvm/utils/TableGen/AsmWriterInst.h
@@ -0,0 +1,104 @@
+//===- AsmWriterInst.h - Classes encapsulating a printable inst -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// These classes implement a parser for assembly strings.  The parser splits
+// the string into operands, which can be literal strings (the constant bits of
+// the string), actual operands (i.e., operands from the MachineInstr), and
+// dynamically-generated text, specified by raw C++ code.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ASMWRITER_INST_H
+#define ASMWRITER_INST_H
+
+#include <string>
+#include <vector>
+
+namespace llvm {
+  class CodeGenInstruction;
+  class Record;
+  
+  struct AsmWriterOperand {
+    enum OpType {
+      // Output this text surrounded by quotes to the asm.
+      isLiteralTextOperand, 
+      // This is the name of a routine to call to print the operand.
+      isMachineInstrOperand,
+      // Output this text verbatim to the asm writer.  It is code that
+      // will output some text to the asm.
+      isLiteralStatementOperand
+    } OperandType;
+    
+    /// Str - For isLiteralTextOperand, this IS the literal text.  For
+    /// isMachineInstrOperand, this is the PrinterMethodName for the operand..
+    /// For isLiteralStatementOperand, this is the code to insert verbatim 
+    /// into the asm writer.
+    std::string Str;
+    
+    /// MiOpNo - For isMachineInstrOperand, this is the operand number of the
+    /// machine instruction.
+    unsigned MIOpNo;
+    
+    /// MiModifier - For isMachineInstrOperand, this is the modifier string for
+    /// an operand, specified with syntax like ${opname:modifier}.
+    std::string MiModifier;
+    
+    // To make VS STL happy
+    AsmWriterOperand(OpType op = isLiteralTextOperand):OperandType(op) {}
+    
+    AsmWriterOperand(const std::string &LitStr,
+                     OpType op = isLiteralTextOperand)
+    : OperandType(op), Str(LitStr) {}
+    
+    AsmWriterOperand(const std::string &Printer, unsigned OpNo, 
+                     const std::string &Modifier,
+                     OpType op = isMachineInstrOperand) 
+    : OperandType(op), Str(Printer), MIOpNo(OpNo),
+    MiModifier(Modifier) {}
+    
+    bool operator!=(const AsmWriterOperand &Other) const {
+      if (OperandType != Other.OperandType || Str != Other.Str) return true;
+      if (OperandType == isMachineInstrOperand)
+        return MIOpNo != Other.MIOpNo || MiModifier != Other.MiModifier;
+      return false;
+    }
+    bool operator==(const AsmWriterOperand &Other) const {
+      return !operator!=(Other);
+    }
+    
+    /// getCode - Return the code that prints this operand.
+    std::string getCode() const;
+  };
+  
+  class AsmWriterInst {
+  public:
+    std::vector<AsmWriterOperand> Operands;
+    const CodeGenInstruction *CGI;
+    
+    AsmWriterInst(const CodeGenInstruction &CGI, Record *AsmWriter);
+    
+    /// MatchesAllButOneOp - If this instruction is exactly identical to the
+    /// specified instruction except for one differing operand, return the
+    /// differing operand number.  Otherwise return ~0.
+    unsigned MatchesAllButOneOp(const AsmWriterInst &Other) const;
+    
+  private:
+    void AddLiteralString(const std::string &Str) {
+      // If the last operand was already a literal text string, append this to
+      // it, otherwise add a new operand.
+      if (!Operands.empty() &&
+          Operands.back().OperandType == AsmWriterOperand::isLiteralTextOperand)
+        Operands.back().Str.append(Str);
+      else
+        Operands.push_back(AsmWriterOperand(Str));
+    }
+  };
+}
+
+#endif