Add wamr to esp-idf components registry (#3264)

Espressif has [ESP-IDF component registry](https://components.espressif.com/) to
manage external components, and developers can use this directly and easily.

CMakeLists.txt

@@ -3,6 +3,11 @@
 
 cmake_minimum_required (VERSION 3.0)
 
+if(ESP_PLATFORM)
+  include (${COMPONENT_DIR}/build-scripts/esp-idf/wamr/CMakeLists.txt)
+  return()
+endif()
+
 project (iwasm)
 
 set (CMAKE_VERBOSE_MAKEFILE OFF)

core/shared/platform/esp-idf/espidf_memmap.c

@@ -55,7 +55,23 @@ os_mmap(void *hint, size_t size, int prot, int flags, os_file_handle file)
 #else
         uint32_t mem_caps = MALLOC_CAP_8BIT;
 #endif
-        return heap_caps_malloc(size, mem_caps);
+        void *buf_origin = heap_caps_malloc(size, mem_caps);
+        if (!buf_origin) {
+            return NULL;
+        }
+
+        // Memory allocation with MALLOC_CAP_SPIRAM or MALLOC_CAP_8BIT will
+        // return 4-byte aligned Reserve extra 4 byte to fixup alignment and
+        // size for the pointer to the originally allocated address
+        void *buf_fixed = buf_origin + sizeof(void *);
+        if ((uintptr_t)buf_fixed & (uintptr_t)0x7) {
+            buf_fixed = (void *)((uintptr_t)(buf_fixed + 4) & (~(uintptr_t)7));
+        }
+
+        uintptr_t *addr_field = buf_fixed - sizeof(uintptr_t);
+        *addr_field = (uintptr_t)buf_origin;
+
+        return buf_fixed;
     }
 }
 

idf_component.yml

@@ -0,0 +1,8 @@
+version: "1.3.2"
+description: WebAssembly Micro Runtime - A lightweight standalone WebAssembly (Wasm) runtime with small footprint, high performance and highly configurable features
+url: https://bytecodealliance.org/
+repository: https://github.com/bytecodealliance/wasm-micro-runtime.git
+documentation: https://wamr.gitbook.io/
+issues: https://github.com/bytecodealliance/wasm-micro-runtime/issues
+dependencies:
+  idf: ">=4.4"

product-mini/platforms/esp-idf/CMakeLists.txt

@@ -6,7 +6,4 @@ cmake_minimum_required(VERSION 3.5)
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 
-set (COMPONENTS ${IDF_TARGET} main freertos esptool_py wamr)
-list(APPEND EXTRA_COMPONENT_DIRS "$ENV{WAMR_PATH}/build-scripts/esp-idf")
-
 project(wamr-simple)

product-mini/platforms/esp-idf/main/CMakeLists.txt

@@ -2,5 +2,4 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 idf_component_register(SRCS "main.c"
-                    INCLUDE_DIRS "."
-                    REQUIRES wamr)
+                    INCLUDE_DIRS ".")

product-mini/platforms/esp-idf/main/idf_component.yml

@@ -0,0 +1,7 @@
+## IDF Component Manager Manifest File
+dependencies:
+  wasm-micro-runtime:
+    version: ">=1.3"
+    override_path: "../../../.."
+  idf:
+    version: ">=4.4"

product-mini/platforms/esp-idf/main/main.c

@@ -12,11 +12,7 @@
 
 #include "esp_log.h"
 
-#ifdef CONFIG_IDF_TARGET_ESP32S3
 #define IWASM_MAIN_STACK_SIZE 5120
-#else
-#define IWASM_MAIN_STACK_SIZE 4096
-#endif
 
 #define LOG_TAG "wamr"