Make the disassembler tables const so they end up in read-only memory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117206 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/Disassembler/X86Disassembler.cpp

@@ -157,9 +157,8 @@ static void translateRegister(MCInst &mcInst, Reg reg) {
 /// @param immediate    - The immediate value to append.
 /// @param operand      - The operand, as stored in the descriptor table.
 /// @param insn         - The internal instruction.
-static void translateImmediate(MCInst &mcInst, 
+static void translateImmediate(MCInst &mcInst, uint64_t immediate,
-                               uint64_t immediate, 
+                               const OperandSpecifier &operand,
-                               OperandSpecifier &operand,
                                InternalInstruction &insn) {
   // Sign-extend the immediate if necessary.
 
@@ -392,9 +391,8 @@ static bool translateRMMemory(MCInst &mcInst, InternalInstruction &insn) {
 /// @param insn         - The instruction to extract Mod, R/M, and SIB fields
 ///                       from.
 /// @return             - 0 on success; nonzero otherwise
-static bool translateRM(MCInst &mcInst,
+static bool translateRM(MCInst &mcInst, const OperandSpecifier &operand,
-                       OperandSpecifier &operand,
+                        InternalInstruction &insn) {
-                       InternalInstruction &insn) {
   switch (operand.type) {
   default:
     debug("Unexpected type for a R/M operand");
@@ -461,9 +459,8 @@ static bool translateFPRegister(MCInst &mcInst,
 /// @param operand      - The operand, as stored in the descriptor table.
 /// @param insn         - The internal instruction.
 /// @return             - false on success; true otherwise.
-static bool translateOperand(MCInst &mcInst,
+static bool translateOperand(MCInst &mcInst, const OperandSpecifier &operand,
-                            OperandSpecifier &operand,
+                             InternalInstruction &insn) {
-                            InternalInstruction &insn) {
   switch (operand.encoding) {
   default:
     debug("Unhandled operand encoding during translation");

lib/Target/X86/Disassembler/X86Disassembler.h

@@ -78,7 +78,7 @@
   const char*             name;
 
 #define INSTRUCTION_IDS               \
-  InstrUID*  instructionIDs;
+  const InstrUID *instructionIDs;
 
 #include "X86DisassemblerDecoderCommon.h"
 

lib/Target/X86/Disassembler/X86DisassemblerDecoder.c

@@ -97,7 +97,7 @@ static InstrUID decode(OpcodeType type,
                        InstructionContext insnContext,
                        uint8_t opcode,
                        uint8_t modRM) {
-  struct ModRMDecision* dec;
+  const struct ModRMDecision* dec;
   
   switch (type) {
   default:
@@ -141,7 +141,7 @@ static InstrUID decode(OpcodeType type,
  *              decode(); specifierForUID will not check bounds.
  * @return    - A pointer to the specification for that instruction.
  */
-static struct InstructionSpecifier* specifierForUID(InstrUID uid) {
+static const struct InstructionSpecifier *specifierForUID(InstrUID uid) {
   return &INSTRUCTIONS_SYM[uid];
 }
 
@@ -626,9 +626,9 @@ static int getID(struct InternalInstruction* insn) {
      * instead of F2 changes a 32 to a 64, we adopt the new encoding.
      */
     
-    struct InstructionSpecifier* spec;
+    const struct InstructionSpecifier *spec;
     uint16_t instructionIDWithREXw;
-    struct InstructionSpecifier* specWithREXw;
+    const struct InstructionSpecifier *specWithREXw;
     
     spec = specifierForUID(instructionID);
     
@@ -666,9 +666,9 @@ static int getID(struct InternalInstruction* insn) {
      * in the right place we check if there's a 16-bit operation.
      */
     
-    struct InstructionSpecifier* spec;
+    const struct InstructionSpecifier *spec;
     uint16_t instructionIDWithOpsize;
-    struct InstructionSpecifier* specWithOpsize;
+    const struct InstructionSpecifier *specWithOpsize;
     
     spec = specifierForUID(instructionID);
     
@@ -1061,7 +1061,7 @@ GENERIC_FIXUP_FUNC(fixupRMValue,  insn->eaRegBase,  EA_REG)
  *                invalid for its class.
  */
 static int fixupReg(struct InternalInstruction *insn, 
-                    struct OperandSpecifier *op) {
+                    const struct OperandSpecifier *op) {
   uint8_t valid;
   
   dbgprintf(insn, "fixupReg()");

lib/Target/X86/Disassembler/X86DisassemblerDecoder.h

@@ -24,7 +24,7 @@ extern "C" {
   const char*             name;
 
 #define INSTRUCTION_IDS     \
-  InstrUID*  instructionIDs;
+  const InstrUID *instructionIDs;
 
 #include "X86DisassemblerDecoderCommon.h"
   
@@ -423,7 +423,7 @@ struct InternalInstruction {
   /* The instruction ID, extracted from the decode table */
   uint16_t instructionID;
   /* The specifier for the instruction, from the instruction info table */
-  struct InstructionSpecifier* spec;
+  const struct InstructionSpecifier *spec;
   
   /* state for additional bytes, consumed during operand decode.  Pattern:
      consumed___ indicates that the byte was already consumed and does not

utils/TableGen/X86DisassemblerTables.cpp

@@ -275,7 +275,7 @@ void DisassemblerTables::emitModRMDecision(raw_ostream &o1,
     return;
   }
     
-  o1.indent(i1) << "static InstrUID modRMTable" << thisTableNumber;
+  o1.indent(i1) << "static const InstrUID modRMTable" << thisTableNumber;
     
   switch (dt) {
     default:
@@ -365,7 +365,7 @@ void DisassemblerTables::emitContextDecision(
   uint32_t &i2,
   ContextDecision &decision,
   const char* name) const {
-  o2.indent(i2) << "static struct ContextDecision " << name << " = {\n";
+  o2.indent(i2) << "static const struct ContextDecision " << name << " = {\n";
   i2++;
   o2.indent(i2) << "{ /* opcodeDecisions */" << "\n";
   i2++;
@@ -392,9 +392,8 @@ void DisassemblerTables::emitContextDecision(
 
 void DisassemblerTables::emitInstructionInfo(raw_ostream &o, uint32_t &i) 
   const {
-  o.indent(i * 2) << "static struct InstructionSpecifier " INSTRUCTIONS_STR "[";
+  o.indent(i * 2) << "static const struct InstructionSpecifier ";
-  o << InstructionSpecifiers.size();
+  o << INSTRUCTIONS_STR "[" << InstructionSpecifiers.size() << "] = {\n";
-  o << "] = {" << "\n";
   
   i++;