WIP: wasm oob trap handling experiments

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 482 matching lines @@
       WriteModeAndPC(pc_delta, rmode);
       WriteIntData(id_delta);
     }
     last_id_ = static_cast<int>(rinfo->data());
   } else if (rmode == RelocInfo::DEOPT_REASON) {
     DCHECK(rinfo->data() < (1 << kShortDataBits));
     WriteShortTaggedPC(pc_delta, kLocatableTag);
     WriteShortTaggedData(rinfo->data(), kDeoptReasonTag);
   } else {
     WriteModeAndPC(pc_delta, rmode);
-    if (RelocInfo::IsComment(rmode)) {
+    if (RelocInfo::IsComment(rmode) || RelocInfo::IsWasmTrapLanding(rmode)) {
       WriteData(rinfo->data());
     } else if (RelocInfo::IsConstPool(rmode) ||
                RelocInfo::IsVeneerPool(rmode) || RelocInfo::IsDeoptId(rmode) ||
                RelocInfo::IsDeoptPosition(rmode)) {
       WriteIntData(static_cast<int>(rinfo->data()));
     }
   }
   last_pc_ = rinfo->pc();
   last_mode_ = rmode;
 #ifdef DEBUG
@@ skipping 123 matching lines @@
       if (rmode == RelocInfo::PC_JUMP) {
         AdvanceReadLongPCJump();
       } else {
         AdvanceReadPC();
         if (rmode == RelocInfo::CODE_TARGET_WITH_ID) {
           if (SetMode(rmode)) {
             AdvanceReadId();
             return;
           }
           Advance(kIntSize);
-        } else if (RelocInfo::IsComment(rmode)) {
+        } else if (RelocInfo::IsComment(rmode) ||
+                   RelocInfo::IsWasmTrapLanding(rmode)) {
           if (SetMode(rmode)) {
             AdvanceReadData();
             return;
           }
           Advance(kIntptrSize);
         } else if (RelocInfo::IsConstPool(rmode) ||
                    RelocInfo::IsVeneerPool(rmode) ||
                    RelocInfo::IsDeoptId(rmode) ||
                    RelocInfo::IsDeoptPosition(rmode)) {
           if (SetMode(rmode)) {
@@ skipping 131 matching lines @@
     case CODE_AGE_SEQUENCE:
       return "code age sequence";
     case GENERATOR_CONTINUATION:
       return "generator continuation";
     case WASM_MEMORY_REFERENCE:
       return "wasm memory reference";
     case WASM_MEMORY_SIZE_REFERENCE:
       return "wasm memory size reference";
     case WASM_GLOBAL_REFERENCE:
       return "wasm global value reference";
+    case WASM_TRAP_LANDING:
+      return "wasm trap landing";
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
       return "number_of_modes";
   }
   return "unknown relocation type";
 }
 
 
 void RelocInfo::Print(Isolate* isolate, std::ostream& os) {  // NOLINT
@@ skipping 77 matching lines @@
     case CONST_POOL:
     case VENEER_POOL:
     case DEBUG_BREAK_SLOT_AT_POSITION:
     case DEBUG_BREAK_SLOT_AT_RETURN:
     case DEBUG_BREAK_SLOT_AT_CALL:
     case DEBUG_BREAK_SLOT_AT_TAIL_CALL:
     case GENERATOR_CONTINUATION:
     case WASM_MEMORY_REFERENCE:
     case WASM_MEMORY_SIZE_REFERENCE:
     case WASM_GLOBAL_REFERENCE:
+    case WASM_TRAP_LANDING:
     case NONE32:
     case NONE64:
       break;
     case NUMBER_OF_MODES:
     case PC_JUMP:
       UNREACHABLE();
       break;
     case CODE_AGE_SEQUENCE:
       DCHECK(Code::IsYoungSequence(isolate, pc_) || code_age_stub()->IsCode());
       break;
@@ skipping 1050 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8