What year is it! This file has no reason to be written in C, and has doubly no

reason to expose a global symbol 'decodeInstruction' nor to pollute the global
scope with a bunch of external linkage entities (some of which conflict with
others elsewhere in LLVM).

This is just the initial transition to C++; more cleanups to follow.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206717 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 103 insertions, 109 deletions

diff --git a/lib/Target/X86/Disassembler/CMakeLists.txt b/lib/Target/X86/Disassembler/CMakeLists.txt
index deed115b59..43702826c9 100644
--- a/lib/Target/X86/Disassembler/CMakeLists.txt
+++ b/lib/Target/X86/Disassembler/CMakeLists.txt
@@ -1,4 +1,4 @@
 add_llvm_library(LLVMX86Disassembler
   X86Disassembler.cpp
-  X86DisassemblerDecoder.c
+  X86DisassemblerDecoder.cpp
   )
diff --git a/lib/Target/X86/Disassembler/X86Disassembler.cpp b/lib/Target/X86/Disassembler/X86Disassembler.cpp
index f03ed13d13..60b6967990 100644
--- a/lib/Target/X86/Disassembler/X86Disassembler.cpp
+++ b/lib/Target/X86/Disassembler/X86Disassembler.cpp
@@ -37,18 +37,18 @@
 using namespace llvm;
 using namespace llvm::X86Disassembler;
 
-void x86DisassemblerDebug(const char *file,
-                          unsigned line,
-                          const char *s) {
+void llvm::X86Disassembler::Debug(const char *file, unsigned line,
+                                  const char *s) {
   dbgs() << file << ":" << line << ": " << s;
 }
 
-const char *x86DisassemblerGetInstrName(unsigned Opcode, const void *mii) {
+const char *llvm::X86Disassembler::GetInstrName(unsigned Opcode,
+                                                const void *mii) {
   const MCInstrInfo *MII = static_cast<const MCInstrInfo *>(mii);
   return MII->getName(Opcode);
 }
 
-#define debug(s) DEBUG(x86DisassemblerDebug(__FILE__, __LINE__, s));
+#define debug(s) DEBUG(Debug(__FILE__, __LINE__, s));
 
 namespace llvm {  
   
diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp
index 0801c969d3..b80e3a90a6 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.c
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp
@@ -1,17 +1,17 @@
-/*===-- X86DisassemblerDecoder.c - Disassembler decoder ------------*- C -*-===*
- *
- *                     The LLVM Compiler Infrastructure
- *
- * This file is distributed under the University of Illinois Open Source
- * License. See LICENSE.TXT for details.
- *
- *===----------------------------------------------------------------------===*
- *
- * This file is part of the X86 Disassembler.
- * It contains the implementation of the instruction decoder.
- * Documentation for the disassembler can be found in X86Disassembler.h.
- *
- *===----------------------------------------------------------------------===*/
+//===-- X86DisassemblerDecoder.c - Disassembler decoder -------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is part of the X86 Disassembler.
+// It contains the implementation of the instruction decoder.
+// Documentation for the disassembler can be found in X86Disassembler.h.
+//
+//===----------------------------------------------------------------------===//
 
 #include <stdarg.h>   /* for va_*()       */
 #include <stdio.h>    /* for vsnprintf()  */
@@ -20,13 +20,15 @@
 
 #include "X86DisassemblerDecoder.h"
 
+using namespace llvm::X86Disassembler;
+
 #include "X86GenDisassemblerTables.inc"
 
 #define TRUE  1
 #define FALSE 0
 
 #ifndef NDEBUG
-#define debug(s) do { x86DisassemblerDebug(__FILE__, __LINE__, s); } while (0)
+#define debug(s) do { Debug(__FILE__, __LINE__, s); } while (0)
 #else
 #define debug(s) do { } while (0)
 #endif
@@ -41,7 +43,7 @@
  *                    an instruction with these attributes.
  */
 static InstructionContext contextForAttrs(uint16_t attrMask) {
-  return CONTEXTS_SYM[attrMask];
+  return static_cast<InstructionContext>(CONTEXTS_SYM[attrMask]);
 }
 
 /*
@@ -792,9 +794,7 @@ static int getIDWithAttrMask(uint16_t* instructionID,
                              uint16_t attrMask) {
   BOOL hasModRMExtension;
 
-  uint16_t instructionClass;
-
-  instructionClass = contextForAttrs(attrMask);
+  InstructionContext instructionClass = contextForAttrs(attrMask);
 
   hasModRMExtension = modRMRequired(insn->opcodeType,
                                     instructionClass,
@@ -1011,9 +1011,8 @@ static int getID(struct InternalInstruction* insn, const void *miiArg) {
       return 0;
     }
 
-    specName = x86DisassemblerGetInstrName(instructionID, miiArg);
-    specWithOpSizeName =
-      x86DisassemblerGetInstrName(instructionIDWithOpsize, miiArg);
+    specName = GetInstrName(instructionID, miiArg);
+    specWithOpSizeName = GetInstrName(instructionIDWithOpsize, miiArg);
 
     if (is16BitEquivalent(specName, specWithOpSizeName) &&
         (insn->mode == MODE_16BIT) ^ insn->prefixPresent[0x66]) {
@@ -1077,8 +1076,8 @@ static int getID(struct InternalInstruction* insn, const void *miiArg) {
  * @return      - 0 if the SIB byte was successfully read; nonzero otherwise.
  */
 static int readSIB(struct InternalInstruction* insn) {
-  SIBIndex sibIndexBase = 0;
-  SIBBase sibBaseBase = 0;
+  SIBIndex sibIndexBase = SIB_INDEX_NONE;
+  SIBBase sibBaseBase = SIB_BASE_NONE;
   uint8_t index, base;
 
   dbgprintf(insn, "readSIB()");
@@ -1599,20 +1598,22 @@ static int readImmediate(struct InternalInstruction* insn, uint8_t size) {
 static int readVVVV(struct InternalInstruction* insn) {
   dbgprintf(insn, "readVVVV()");
 
+  int vvvv;
   if (insn->vectorExtensionType == TYPE_EVEX)
-    insn->vvvv = vvvvFromEVEX3of4(insn->vectorExtensionPrefix[2]);
+    vvvv = vvvvFromEVEX3of4(insn->vectorExtensionPrefix[2]);
   else if (insn->vectorExtensionType == TYPE_VEX_3B)
-    insn->vvvv = vvvvFromVEX3of3(insn->vectorExtensionPrefix[2]);
+    vvvv = vvvvFromVEX3of3(insn->vectorExtensionPrefix[2]);
   else if (insn->vectorExtensionType == TYPE_VEX_2B)
-    insn->vvvv = vvvvFromVEX2of2(insn->vectorExtensionPrefix[1]);
+    vvvv = vvvvFromVEX2of2(insn->vectorExtensionPrefix[1]);
   else if (insn->vectorExtensionType == TYPE_XOP)
-    insn->vvvv = vvvvFromXOP3of3(insn->vectorExtensionPrefix[2]);
+    vvvv = vvvvFromXOP3of3(insn->vectorExtensionPrefix[2]);
   else
     return -1;
 
   if (insn->mode != MODE_64BIT)
-    insn->vvvv &= 0x7;
+    vvvv &= 0x7;
 
+  insn->vvvv = static_cast<Reg>(vvvv);
   return 0;
 }
 
@@ -1629,7 +1630,8 @@ static int readMaskRegister(struct InternalInstruction* insn) {
   if (insn->vectorExtensionType != TYPE_EVEX)
     return -1;
 
-  insn->writemask = aaaFromEVEX4of4(insn->vectorExtensionPrefix[3]);
+  insn->writemask =
+      static_cast<Reg>(aaaFromEVEX4of4(insn->vectorExtensionPrefix[3]));
   return 0;
 }
 
@@ -1781,14 +1783,10 @@ static int readOperands(struct InternalInstruction* insn) {
  * @return          - 0 if the instruction's memory could be read; nonzero if
  *                    not.
  */
-int decodeInstruction(struct InternalInstruction* insn,
-                      byteReader_t reader,
-                      const void* readerArg,
-                      dlog_t logger,
-                      void* loggerArg,
-                      const void* miiArg,
-                      uint64_t startLoc,
-                      DisassemblerMode mode) {
+int llvm::X86Disassembler::decodeInstruction(
+    struct InternalInstruction *insn, byteReader_t reader,
+    const void *readerArg, dlog_t logger, void *loggerArg, const void *miiArg,
+    uint64_t startLoc, DisassemblerMode mode) {
   memset(insn, 0, sizeof(struct InternalInstruction));
 
   insn->reader = reader;
diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h
index ac3b39df54..19455e33ed 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h
@@ -1,25 +1,21 @@
-/*===-- X86DisassemblerDecoderInternal.h - Disassembler decoder ---*- C -*-===*
- *
- *                     The LLVM Compiler Infrastructure
- *
- * This file is distributed under the University of Illinois Open Source
- * License. See LICENSE.TXT for details.
- *
- *===----------------------------------------------------------------------===*
- *
- * This file is part of the X86 Disassembler.
- * It contains the public interface of the instruction decoder.
- * Documentation for the disassembler can be found in X86Disassembler.h.
- *
- *===----------------------------------------------------------------------===*/
+//===-- X86DisassemblerDecoderInternal.h - Disassembler decoder -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is part of the X86 Disassembler.
+// It contains the public interface of the instruction decoder.
+// Documentation for the disassembler can be found in X86Disassembler.h.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef X86DISASSEMBLERDECODER_H
 #define X86DISASSEMBLERDECODER_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #define INSTRUCTION_SPECIFIER_FIELDS \
   uint16_t operands;
 
@@ -31,6 +27,9 @@ extern "C" {
 #undef INSTRUCTION_SPECIFIER_FIELDS
 #undef INSTRUCTION_IDS
 
+namespace llvm {
+namespace X86Disassembler {
+
 /*
  * Accessor functions for various fields of an Intel instruction
  */
@@ -684,21 +683,17 @@ int decodeInstruction(struct InternalInstruction* insn,
                       uint64_t startLoc,
                       DisassemblerMode mode);
 
-/* x86DisassemblerDebug - C-accessible function for printing a message to
- *   debugs()
+/* \brief Debug - Print a message to debugs()
  * @param file  - The name of the file printing the debug message.
  * @param line  - The line number that printed the debug message.
  * @param s     - The message to print.
  */
 
-void x86DisassemblerDebug(const char *file,
-                          unsigned line,
-                          const char *s);
+void Debug(const char *file, unsigned line, const char *s);
 
-const char *x86DisassemblerGetInstrName(unsigned Opcode, const void *mii);
+const char *GetInstrName(unsigned Opcode, const void *mii);
 
-#ifdef __cplusplus
-}
-#endif
+} // namespace X86Disassembler
+} // namespace llvm
 
 #endif
diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h b/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h
index 523ae997f6..b8130a0f9c 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h
@@ -1,29 +1,27 @@
-/*===-- X86DisassemblerDecoderCommon.h - Disassembler decoder -----*- C -*-===*
- *
- *                     The LLVM Compiler Infrastructure
- *
- * This file is distributed under the University of Illinois Open Source
- * License. See LICENSE.TXT for details.
- *
- *===----------------------------------------------------------------------===*
- *
- * This file is part of the X86 Disassembler.
- * It contains common definitions used by both the disassembler and the table
- *  generator.
- * Documentation for the disassembler can be found in X86Disassembler.h.
- *
- *===----------------------------------------------------------------------===*/
-
-/*
- * This header file provides those definitions that need to be shared between
- * the decoder and the table generator in a C-friendly manner.
- */
+//===-- X86DisassemblerDecoderCommon.h - Disassembler decoder ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is part of the X86 Disassembler.
+// It contains common definitions used by both the disassembler and the table
+//  generator.
+// Documentation for the disassembler can be found in X86Disassembler.h.
+//
+//===----------------------------------------------------------------------===//
 
 #ifndef X86DISASSEMBLERDECODERCOMMON_H
 #define X86DISASSEMBLERDECODERCOMMON_H
 
 #include "llvm/Support/DataTypes.h"
 
+namespace llvm {
+namespace X86Disassembler {
+
 #define INSTRUCTIONS_SYM  x86DisassemblerInstrSpecifiers
 #define CONTEXTS_SYM      x86DisassemblerContexts
 #define ONEBYTE_SYM       x86DisassemblerOneByteOpcodes
@@ -274,17 +272,17 @@ enum attributeBits {
   ENUM_ENTRY(IC_EVEX_L2_W_OPSIZE_KZ, 4,  "requires EVEX_KZ, L2, W and OpSize")     
 
 #define ENUM_ENTRY(n, r, d) n,
-typedef enum {
+enum InstructionContext {
   INSTRUCTION_CONTEXTS
   IC_max
-} InstructionContext;
+};
 #undef ENUM_ENTRY
 
 /*
  * Opcode types, which determine which decode table to use, both in the Intel
  * manual and also for the decoder.
  */
-typedef enum {
+enum OpcodeType {
   ONEBYTE       = 0,
   TWOBYTE       = 1,
   THREEBYTE_38  = 2,
@@ -292,7 +290,7 @@ typedef enum {
   XOP8_MAP      = 4,
   XOP9_MAP      = 5,
   XOPA_MAP      = 6
-} OpcodeType;
+};
 
 /*
  * The following structs are used for the hierarchical decode table.  After
@@ -333,10 +331,10 @@ typedef uint16_t InstrUID;
   ENUM_ENTRY(MODRM_FULL)
 
 #define ENUM_ENTRY(n) n,
-typedef enum {
+enum ModRMDecisionType {
   MODRMTYPES
   MODRM_max
-} ModRMDecisionType;
+};
 #undef ENUM_ENTRY
 
 /*
@@ -356,7 +354,7 @@ struct ModRMDecision {
  *   given a particular opcode.
  */
 struct OpcodeDecision {
-  struct ModRMDecision modRMDecisions[256];
+  ModRMDecision modRMDecisions[256];
 };
 
 /*
@@ -367,7 +365,7 @@ struct OpcodeDecision {
  *   entries in this table, rather than 2^(ATTR_max).
  */
 struct ContextDecision {
-  struct OpcodeDecision opcodeDecisions[IC_max];
+  OpcodeDecision opcodeDecisions[IC_max];
 };
 
 /*
@@ -408,10 +406,10 @@ struct ContextDecision {
   ENUM_ENTRY(ENCODING_DI,     "Destination index; encoded in prefixes")
 
 #define ENUM_ENTRY(n, d) n,
-  typedef enum {
-    ENCODINGS
-    ENCODING_max
-  } OperandEncoding;
+enum OperandEncoding {
+  ENCODINGS
+  ENCODING_max
+};
 #undef ENUM_ENTRY
 
 /*
@@ -508,10 +506,10 @@ struct ContextDecision {
   ENUM_ENTRY(TYPE_M512,       "512-bit FPU/MMX/XMM/MXCSR state")
 
 #define ENUM_ENTRY(n, d) n,
-typedef enum {
+enum OperandType {
   TYPES
   TYPE_max
-} OperandType;
+};
 #undef ENUM_ENTRY
 
 /*
@@ -532,10 +530,10 @@ struct OperandSpecifier {
   ENUM_ENTRY(MODIFIER_NONE)
 
 #define ENUM_ENTRY(n) n,
-typedef enum {
+enum ModifierType {
   MODIFIER_TYPES
   MODIFIER_max
-} ModifierType;
+};
 #undef ENUM_ENTRY
 
 #define X86_MAX_OPERANDS 5
@@ -554,10 +552,13 @@ struct InstructionSpecifier {
  * are supported, and represent real mode, IA-32e, and IA-32e in 64-bit mode,
  * respectively.
  */
-typedef enum {
+enum DisassemblerMode {
   MODE_16BIT,
   MODE_32BIT,
   MODE_64BIT
-} DisassemblerMode;
+};
+
+} // namespace X86Disassembler
+} // namespace llvm
 
 #endif