[wasm] Decoder had 2 representations for "end".

src/wasm/module-decoder.cc

Index: src/wasm/module-decoder.cc
diff --git a/src/wasm/module-decoder.cc b/src/wasm/module-decoder.cc
index 550a2bd61779189a04490082686588e41d13afec..97d1a62da659e7ea5cd1c67079b295ad24653b65 100644
--- a/src/wasm/module-decoder.cc
+++ b/src/wasm/module-decoder.cc
@@ -180,14 +180,14 @@ class ModuleDecoder : public Decoder {
                 ModuleOrigin origin)
       : Decoder(module_start, module_end), module_zone(zone), origin_(origin) {
     result_.start = start_;
-    if (limit_ < start_) {
+    if (end_ < start_) {
       error(start_, "end is less than start");
-      limit_ = start_;
+      end_ = start_;
     }
   }
 
   virtual void onFirstError() {
-    pc_ = limit_;  // On error, terminate section decoding loop.
+    pc_ = end_;  // On error, terminate section decoding loop.
   }
 
   void DumpModule(const ModuleResult& result) {
@@ -200,7 +200,7 @@ class ModuleDecoder : public Decoder {
       }
     }
     // File are named `HASH.{ok,failed}.wasm`.
-    size_t hash = base::hash_range(start_, limit_);
+    size_t hash = base::hash_range(start_, end_);
     char buf[32] = {'\0'};
 #if V8_OS_WIN && _MSC_VER < 1900
 #define snprintf sprintf_s
@@ -209,7 +209,7 @@ class ModuleDecoder : public Decoder {
              result.ok() ? "ok" : "failed");
     std::string name(buf);
     if (FILE* wasm_file = base::OS::FOpen((path + name).c_str(), "wb")) {
-      fwrite(start_, limit_ - start_, 1, wasm_file);
+      fwrite(start_, end_ - start_, 1, wasm_file);
       fclose(wasm_file);
     }
   }
@@ -572,7 +572,7 @@ class ModuleDecoder : public Decoder {
         function->code_end_offset = pc_offset() + size;
         if (verify_functions) {
           ModuleBytesEnv module_env(module, nullptr,
-                                    ModuleWireBytes(start_, limit_));
+                                    ModuleWireBytes(start_, end_));
           VerifyFunctionBody(i + module->num_imported_functions, &module_env,
                              function);
         }
@@ -651,7 +651,7 @@ class ModuleDecoder : public Decoder {
     function->name_offset = 0;                // ---- name
     function->name_length = 0;                // ---- name length
     function->code_start_offset = off(pc_);   // ---- code start
-    function->code_end_offset = off(limit_);  // ---- code end
+    function->code_end_offset = off(end_);    // ---- code end
 
     if (ok()) VerifyFunctionBody(0, module_env, function);
 
@@ -729,7 +729,7 @@ class ModuleDecoder : public Decoder {
     segment->source_offset = static_cast<uint32_t>(pc_ - start_);
 
     // Validate the data is in the module.
-    uint32_t module_limit = static_cast<uint32_t>(limit_ - start_);
+    uint32_t module_limit = static_cast<uint32_t>(end_ - start_);
     if (!IsWithinLimit(module_limit, segment->source_offset,
                        segment->source_size)) {
       error(start, "segment out of bounds of module");