[X86] Use unique_ptr to simplify memory management. NFC

llvm-svn: 328413

llvm/utils/TableGen/X86DisassemblerShared.h

@@ -49,6 +49,10 @@ struct OpcodeDecision {
 /// entries in this table, rather than 2^(ATTR_max).
 struct ContextDecision {
   OpcodeDecision opcodeDecisions[llvm::X86Disassembler::IC_max];
+
+  ContextDecision() {
+    memset(opcodeDecisions, 0, sizeof(opcodeDecisions));
+  }
 };
 
 #endif

llvm/utils/TableGen/X86DisassemblerTables.cpp

@@ -644,21 +644,13 @@ static const char* stringForDecisionType(ModRMDecisionType dt) {
 }
 
 DisassemblerTables::DisassemblerTables() {
-  unsigned i;
+  for (unsigned i = 0; i < array_lengthof(Tables); i++)
-
+    Tables[i] = llvm::make_unique<ContextDecision>();
-  for (i = 0; i < array_lengthof(Tables); i++) {
-    Tables[i] = new ContextDecision;
-    memset(Tables[i], 0, sizeof(ContextDecision));
-  }
 
   HasConflicts = false;
 }
 
 DisassemblerTables::~DisassemblerTables() {
-  unsigned i;
-
-  for (i = 0; i < array_lengthof(Tables); i++)
-    delete Tables[i];
 }
 
 void DisassemblerTables::emitModRMDecision(raw_ostream &o1, raw_ostream &o2,

llvm/utils/TableGen/X86DisassemblerTables.h

@@ -41,7 +41,7 @@ private:
   /// [4] XOP8 map opcode
   /// [5] XOP9 map opcode
   /// [6] XOPA map opcode
-  ContextDecision* Tables[7];
+  std::unique_ptr<ContextDecision> Tables[7];
 
   // Table of ModRM encodings.
   typedef std::map<std::vector<unsigned>, unsigned> ModRMMapTy;

llvm/utils/TableGen/X86RecognizableInstr.cpp

@@ -695,7 +695,7 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
   case X86Local::ThreeDNow: opcodeType = TWOBYTE;      break;
   }
 
-  ModRMFilter *filter = nullptr;
+  std::unique_ptr<ModRMFilter> filter;
   switch (Form) {
   default: llvm_unreachable("Invalid form!");
   case X86Local::Pseudo: llvm_unreachable("Pseudo should not be emitted!");
@@ -707,36 +707,36 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
   case X86Local::RawFrmDstSrc:
   case X86Local::RawFrmImm8:
   case X86Local::RawFrmImm16:
-    filter = new DumbFilter();
+    filter = llvm::make_unique<DumbFilter>();
     break;
   case X86Local::MRMDestReg:
   case X86Local::MRMSrcReg:
   case X86Local::MRMSrcReg4VOp3:
   case X86Local::MRMSrcRegOp4:
   case X86Local::MRMXr:
-    filter = new ModFilter(true);
+    filter = llvm::make_unique<ModFilter>(true);
     break;
   case X86Local::MRMDestMem:
   case X86Local::MRMSrcMem:
   case X86Local::MRMSrcMem4VOp3:
   case X86Local::MRMSrcMemOp4:
   case X86Local::MRMXm:
-    filter = new ModFilter(false);
+    filter = llvm::make_unique<ModFilter>(false);
     break;
   case X86Local::MRM0r: case X86Local::MRM1r:
   case X86Local::MRM2r: case X86Local::MRM3r:
   case X86Local::MRM4r: case X86Local::MRM5r:
   case X86Local::MRM6r: case X86Local::MRM7r:
-    filter = new ExtendedFilter(true, Form - X86Local::MRM0r);
+    filter = llvm::make_unique<ExtendedFilter>(true, Form - X86Local::MRM0r);
     break;
   case X86Local::MRM0m: case X86Local::MRM1m:
   case X86Local::MRM2m: case X86Local::MRM3m:
   case X86Local::MRM4m: case X86Local::MRM5m:
   case X86Local::MRM6m: case X86Local::MRM7m:
-    filter = new ExtendedFilter(false, Form - X86Local::MRM0m);
+    filter = llvm::make_unique<ExtendedFilter>(false, Form - X86Local::MRM0m);
     break;
   X86_INSTR_MRM_MAPPING
-    filter = new ExactFilter(0xC0 + Form - X86Local::MRM_C0);   \
+    filter = llvm::make_unique<ExactFilter>(0xC0 + Form - X86Local::MRM_C0);
     break;
   } // switch (Form)
 
@@ -771,8 +771,6 @@ void RecognizableInstr::emitDecodePath(DisassemblerTables &tables) const {
                           VEX_WPrefix == X86Local::VEX_WIG, AddressSize);
   }
 
-  delete filter;
-
 #undef MAP
 }