[wasm] Introduce the TrapIf and TrapUnless operators to generate trap code.

src/wasm/wasm-opcodes.h

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_OPCODES_H_
 #define V8_WASM_OPCODES_H_
 
 #include "src/globals.h"
 #include "src/machine-type.h"
 #include "src/signature.h"
@@ skipping 494 matching lines @@
 
 // The reason for a trap.
 #define FOREACH_WASM_TRAPREASON(V) \
   V(TrapUnreachable)               \
   V(TrapMemOutOfBounds)            \
   V(TrapDivByZero)                 \
   V(TrapDivUnrepresentable)        \
   V(TrapRemByZero)                 \
   V(TrapFloatUnrepresentable)      \
   V(TrapFuncInvalid)               \
-  V(TrapFuncSigMismatch)           \
-  V(TrapInvalidIndex)
+  V(TrapFuncSigMismatch)
 
 enum TrapReason {
 #define DECLARE_ENUM(name) k##name,
   FOREACH_WASM_TRAPREASON(DECLARE_ENUM)
   kTrapCount
 #undef DECLARE_ENUM
 };
 
 // A collection of opcode-related static methods.
 class V8_EXPORT_PRIVATE WasmOpcodes {
  public:
   static const char* OpcodeName(WasmOpcode opcode);
   static const char* ShortOpcodeName(WasmOpcode opcode);
   static FunctionSig* Signature(WasmOpcode opcode);
   static FunctionSig* AsmjsSignature(WasmOpcode opcode);
   static FunctionSig* AtomicSignature(WasmOpcode opcode);
   static bool IsPrefixOpcode(WasmOpcode opcode);
 
   static int TrapReasonToMessageId(TrapReason reason);
   static const char* TrapReasonMessage(TrapReason reason);
+  static int32_t TrapReasonToFunctionId(TrapReason reason);
 
   static byte MemSize(MachineType type) {
     return 1 << ElementSizeLog2Of(type.representation());
   }
 
   static byte MemSize(LocalType type) { return 1 << ElementSizeLog2Of(type); }
 
   static LocalTypeCode LocalTypeCodeFor(LocalType type) {
     switch (type) {
       case kAstI32:
@@ skipping 131 matching lines @@
       default:
         return "<unknown>";
     }
   }
 };
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_OPCODES_H_