Implement shared heap for AOT (#3815)

core/iwasm/aot/aot_runtime.c

@@ -57,6 +57,9 @@ bh_static_assert(sizeof(AOTMemoryInstance) == 120);
 bh_static_assert(offsetof(AOTTableInstance, elems) == 24);
 
 bh_static_assert(offsetof(AOTModuleInstanceExtra, stack_sizes) == 0);
+bh_static_assert(offsetof(AOTModuleInstanceExtra, shared_heap_base_addr_adj)
+                 == 8);
+bh_static_assert(offsetof(AOTModuleInstanceExtra, shared_heap_start_off) == 16);
 
 bh_static_assert(sizeof(CApiFuncImport) == sizeof(uintptr_t) * 3);
 
@@ -1885,6 +1888,24 @@ aot_instantiate(AOTModule *module, AOTModuleInstance *parent,
     extra->stack_sizes =
         aot_get_data_section_addr(module, AOT_STACK_SIZES_SECTION_NAME, NULL);
 
+    /*
+     * The AOT code checks whether the n bytes to access are in shared heap
+     * by checking whether the beginning address meets:
+     *   addr >= start_off && addr <= end_off - n-bytes + 1
+     * where n is 1/2/4/8/16 and `end_off - n-bytes + 1` is constant, e.g.,
+     *   UINT32_MAX, UINT32_MAX-1, UINT32_MAX-3 for n = 1, 2 or 4 in 32-bit
+     * target. To simplify the check, when shared heap is disabled, we set
+     * the start off to UINT64_MAX in 64-bit target and UINT32_MAX in 32-bit
+     * target, so in the checking, the above formula will be false, we don't
+     * need to check whether the shared heap is enabled or not in the AOT
+     * code.
+     */
+#if UINTPTR_MAX == UINT64_MAX
+    extra->shared_heap_start_off.u64 = UINT64_MAX;
+#else
+    extra->shared_heap_start_off.u32[0] = UINT32_MAX;
+#endif
+
 #if WASM_ENABLE_PERF_PROFILING != 0
     total_size = sizeof(AOTFuncPerfProfInfo)
                  * ((uint64)module->import_func_count + module->func_count);