Rename _upb_Message_Realloc to _EnsureAvailable

PiperOrigin-RevId: 699248319

Author: protobuf-github-bot

upb/message/internal/extension.c

@@ -52,7 +52,7 @@ upb_Extension* UPB_PRIVATE(_upb_Message_GetOrCreateExtension)(
   UPB_ASSERT(!upb_Message_IsFrozen(msg));
   upb_Extension* ext = (upb_Extension*)UPB_PRIVATE(_upb_Message_Getext)(msg, e);
   if (ext) return ext;
-  if (!UPB_PRIVATE(_upb_Message_Realloc)(msg, sizeof(upb_Extension), a))
+  if (!UPB_PRIVATE(_upb_Message_EnsureAvailable)(msg, sizeof(upb_Extension), a))
     return NULL;
   upb_Message_Internal* in = UPB_PRIVATE(_upb_Message_GetInternal)(msg);
   in->ext_begin -= sizeof(upb_Extension);

upb/message/internal/message.c

@@ -41,8 +41,8 @@ const double kUpb_Infinity = INFINITY;
 
 const double kUpb_NaN = UPB_NAN;
 
-bool UPB_PRIVATE(_upb_Message_Realloc)(struct upb_Message* msg, size_t need,
-                                       upb_Arena* a) {
+bool UPB_PRIVATE(_upb_Message_EnsureAvailable)(struct upb_Message* msg,
+                                               size_t need, upb_Arena* a) {
   UPB_ASSERT(!upb_Message_IsFrozen(msg));
   const size_t overhead = sizeof(upb_Message_Internal);
 

upb/message/internal/message.h

@@ -102,8 +102,11 @@ bool UPB_PRIVATE(_upb_Message_AddUnknownV)(struct upb_Message* msg,
                                            upb_Arena* arena,
                                            upb_StringView data[], size_t count);
 
-bool UPB_PRIVATE(_upb_Message_Realloc)(struct upb_Message* msg, size_t need,
-                                       upb_Arena* arena);
+// Ensure at least `need` unused bytes are available for unknown fields or
+// extensions. Returns false if a reallocation is needed to satisfy the request,
+// and fails.
+bool UPB_PRIVATE(_upb_Message_EnsureAvailable)(struct upb_Message* msg,
+                                               size_t need, upb_Arena* arena);
 
 #define kUpb_Message_UnknownBegin 0
 #define kUpb_Message_ExtensionBegin 0

upb/message/message.c

@@ -40,7 +40,7 @@ bool UPB_PRIVATE(_upb_Message_AddUnknown)(upb_Message* msg, const char* data,
   UPB_ASSERT(!upb_Message_IsFrozen(msg));
   // TODO: b/376969853  - Add debug check that the unknown field is an overall
   // valid proto field
-  if (!UPB_PRIVATE(_upb_Message_Realloc)(msg, len, arena)) return false;
+  if (!UPB_PRIVATE(_upb_Message_EnsureAvailable)(msg, len, arena)) return false;
   upb_Message_Internal* in = UPB_PRIVATE(_upb_Message_GetInternal)(msg);
   memcpy(UPB_PTR_AT(in, in->unknown_end, char), data, len);
   in->unknown_end += len;
@@ -57,7 +57,8 @@ bool UPB_PRIVATE(_upb_Message_AddUnknownV)(struct upb_Message* msg,
   for (size_t i = 0; i < count; i++) {
     total_len += data[i].size;
   }
-  if (!UPB_PRIVATE(_upb_Message_Realloc)(msg, total_len, arena)) return false;
+  if (!UPB_PRIVATE(_upb_Message_EnsureAvailable)(msg, total_len, arena))
+    return false;
 
   upb_Message_Internal* in = UPB_PRIVATE(_upb_Message_GetInternal)(msg);
   for (size_t i = 0; i < count; i++) {