first draft of shared heap enhancement in interpreter and runtime: update function signature

Author: TianlongLiang

core/iwasm/common/wasm_memory.c

@@ -251,7 +251,7 @@ WASMSharedHeap *
 wasm_runtime_chain_shared_heaps(WASMSharedHeap *head, WASMSharedHeap *body)
 {
     WASMSharedHeap *cur;
-    bool heap_handle_exist = false;
+    bool heap_handle_exist = head->heap_handle != NULL;
 
     if (!head || !body) {
         LOG_WARNING("Invalid shared heap to chain.");
@@ -265,8 +265,15 @@ wasm_runtime_chain_shared_heaps(WASMSharedHeap *head, WASMSharedHeap *body)
         os_mutex_unlock(&shared_heap_list_lock);
         return NULL;
     }
-
-    for (cur = head; cur; cur = cur->chain_next) {
+    for (cur = shared_heap_list; cur; cur = cur->next) {
+        if (cur->chain_next == body) {
+            LOG_WARNING("To create shared heap chain, the `body` shared heap "
+                        "can't already be in a chain");
+            os_mutex_unlock(&shared_heap_list_lock);
+            return NULL;
+        }
+    }
+    for (cur = body; cur; cur = cur->chain_next) {
         if (cur->heap_handle && heap_handle_exist) {
             LOG_WARNING(
                 "To create shared heap chain, only one of shared heap can "
@@ -310,7 +317,6 @@ wasm_runtime_unchain_shared_heaps(WASMSharedHeap *head, bool entire_chain)
         if (!entire_chain)
             break;
     }
-
     os_mutex_unlock(&shared_heap_list_lock);
     return cur;
 }

core/iwasm/common/wasm_memory.h

@@ -45,6 +45,12 @@ SET_LINEAR_MEMORY_SIZE(WASMMemoryInstance *memory, uint64 size)
 WASMSharedHeap *
 wasm_runtime_create_shared_heap(SharedHeapInitArgs *init_args);
 
+WASMSharedHeap *
+wasm_runtime_chain_shared_heaps(WASMSharedHeap *head, WASMSharedHeap *body);
+
+WASMSharedHeap *
+wasm_runtime_unchain_shared_heaps(WASMSharedHeap *head, bool entire_chain);
+
 bool
 wasm_runtime_attach_shared_heap(WASMModuleInstanceCommon *module_inst,
                                 WASMSharedHeap *shared_heap);

core/iwasm/include/wasm_export.h

@@ -336,6 +336,7 @@ typedef enum {
 
 typedef struct SharedHeapInitArgs {
     uint32_t size;
+    void *pre_allocated_addr;
 } SharedHeapInitArgs;
 
 /**
@@ -2258,7 +2259,37 @@ WASM_RUNTIME_API_EXTERN wasm_shared_heap_t
 wasm_runtime_create_shared_heap(SharedHeapInitArgs *init_args);
 
 /**
- * Attach a shared heap to a module instance
+ * This function links two shared heaps, `head` and `body`, where `head` is a
+ * shared heap and `body` can be shared heap chain head, into a single chain.
+ * The `head` heap will be the head of the chain, and the `body` heap will be
+ * appended to it. At most one shared heap in shared heap chain can be
+ * dynamically allocated, the rest have to be the pre-allocated shared heap *
+ *
+ * @param head The head of the shared heap chain.
+ * @param body The body of the shared heap chain to be appended.
+ * @return The new head of the shared heap chain. NULL if failed.
+ */
+WASM_RUNTIME_API_EXTERN wasm_shared_heap_t
+wasm_runtime_chain_shared_heaps(wasm_shared_heap_t head,
+                                wasm_shared_heap_t body);
+
+/**
+ * This function unchains the shared heaps from the given head. If
+ * `entire_chain` is true, it will unchain the entire chain of shared heaps.
+ * Otherwise, it will unchain only the first shared heap in the chain.
+ *
+ * @param head The head of the shared heap chain.
+ * @param entire_chain A boolean flag indicating whether to unchain the entire
+ * chain.
+ * @return The new head of the shared heap chain. Or the last shared heap in the
+ * chain if `entire_chain` is true.
+ */
+wasm_shared_heap_t
+wasm_runtime_unchain_shared_heaps(wasm_shared_heap_t head, bool entire_chain);
+
+/**
+ * Attach a shared heap, it can be the head of shared heap chain, in that case,
+ * attach the shared heap chain, to a module instance
  *
  * @param module_inst the module instance
  * @param shared_heap the shared heap
@@ -2277,7 +2308,8 @@ WASM_RUNTIME_API_EXTERN void
 wasm_runtime_detach_shared_heap(wasm_module_inst_t module_inst);
 
 /**
- * Allocate memory from a shared heap
+ * Allocate memory from a shared heap, or the non-preallocated shared heap from
+ * the shared heap chain
  *
  * @param module_inst the module instance
  * @param size required memory size
@@ -2294,7 +2326,8 @@ wasm_runtime_shared_heap_malloc(wasm_module_inst_t module_inst, uint64_t size,
                                 void **p_native_addr);
 
 /**
- * Free the memory allocated from shared heap
+ * Free the memory allocated from shared heap, or the non-preallocated shared
+ * heap from the shared heap chain
  *
  * @param module_inst the module instance
  * @param ptr the offset in wasm app