Enable AoT and wamr-sdk, and change arguments of call wasm API (#157)

* Implement memory profiler, optimize memory usage, modify code indent

* Implement memory.grow and limit heap space base offset to 1G; modify iwasm build type to Release and 64 bit by default

* Add a new extension library: connection

* Fix bug of reading magic number and version in big endian platform

* Re-org platform APIs: move most platform APIs from iwasm to shared-lib

* Enhance wasm loader to fix some security issues

* Fix issue about illegal load of EXC_RETURN into PC on stm32 board

* Updates that let a restricted version of the interpreter run in SGX

* Enable native/app address validation and conversion for wasm app

* Remove wasm_application_exectue_* APIs from wasm_export.h which makes confused

* Refine binary size and fix several minor issues

Optimize interpreter LOAD/STORE opcodes to decrease the binary size
Fix issues when using iwasm library: _bh_log undefined, bh_memory.h not found
Remove unused _stdin/_stdout/_stderr global variables resolve in libc wrapper
Add macros of global heap size, stack size, heap size for Zephyr main.c
Clear compile warning of wasm_application.c

* Add more strict security checks for libc wrapper API's

* Use one libc wrapper copy for sgx and other platforms; remove bh_printf macro for other platform header files

* Enhance security of libc strcpy/sprintf wrapper function

* Fix issue of call native for x86_64/arm/mips, add module inst parameter for native wrapper functions

* Remove get_module_inst() and fix issue of call native

* Refine wgl lib: remove module_inst parameter from widget functions; move function index check to runtime instantiate

* Refine interpreter call native process, refine memory boudary check

* Fix issues of invokeNative function of arm/mips/general version

* Add a switch to build simple sample without gui support

* Add BUILD_TARGET setting in makefile to replace cpu compiler flags in source code

* Re-org shared lib header files, remove unused info; fix compile issues of vxworks

* Add build target general

* Remove unused files

* Update license header

* test push

* Restore file

* Sync up with internal/feature

* Sync up with internal/feature

* Rename build_wamr_app to build_wasm_app

* Fix small issues of README

* Enhance malformed wasm file checking
Fix issue of print hex int and implement utf8 string check
Fix wasi file read/write right issue
Fix minor issue of build wasm app doc

* Sync up with internal/feature

* Sync up with internal/feature: fix interpreter arm issue, fix read leb issue

* Sync up with internal/feature

* Fix bug of config.h and rename wasi config.h to ssp_config.h

* Sync up with internal/feature

* Import wamr aot

* update document

* update document

* Update document, disable WASI in 32bit

* update document

* remove files

* update document

* Update document

* update document

* update document

* update samples

* Sync up with internal repo

core/app-framework/base/app/bh_platform.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "bh_platform.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ *
+ *
+ */
+
+static bool is_little_endian()
+{
+    long i = 0x01020304;
+    unsigned char* c = (unsigned char*) &i;
+    return (*c == 0x04) ? true : false;
+}
+
+static void swap32(uint8* pData)
+{
+    uint8 value = *pData;
+    *pData = *(pData + 3);
+    *(pData + 3) = value;
+
+    value = *(pData + 1);
+    *(pData + 1) = *(pData + 2);
+    *(pData + 2) = value;
+}
+
+static void swap16(uint8* pData)
+{
+    uint8 value = *pData;
+    *(pData) = *(pData + 1);
+    *(pData + 1) = value;
+}
+
+uint32 htonl(uint32 value)
+{
+    uint32 ret;
+    if (is_little_endian()) {
+        ret = value;
+        swap32((uint8*) &ret);
+        return ret;
+    }
+
+    return value;
+}
+
+uint32 ntohl(uint32 value)
+{
+    return htonl(value);
+}
+
+uint16 htons(uint16 value)
+{
+    uint16 ret;
+    if (is_little_endian()) {
+        ret = value;
+        swap16((uint8 *)&ret);
+        return ret;
+    }
+
+    return value;
+}
+
+uint16 ntohs(uint16 value)
+{
+    return htons(value);
+}
+
+char *wa_strdup(const char *s)
+{
+    char *s1 = NULL;
+    if (s && (s1 = wa_malloc(strlen(s) + 1)))
+        memcpy(s1, s, strlen(s) + 1);
+    return s1;
+}
+
+#define RSIZE_MAX 0x7FFFFFFF
+int b_memcpy_s(void * s1, unsigned int s1max, const void * s2, unsigned int n)
+{
+    char *dest = (char*) s1;
+    char *src = (char*) s2;
+    if (n == 0) {
+        return 0;
+    }
+
+    if (s1 == NULL || s1max > RSIZE_MAX) {
+        return -1;
+    }
+    if (s2 == NULL || n > s1max) {
+        memset(dest, 0, s1max);
+        return -1;
+    }
+    memcpy(dest, src, n);
+    return 0;
+}

core/app-framework/base/app/bh_platform.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef DEPS_IWASM_APP_LIBS_BASE_BH_PLATFORM_H_
+#define DEPS_IWASM_APP_LIBS_BASE_BH_PLATFORM_H_
+
+#include <stdbool.h>
+
+typedef unsigned char uint8;
+typedef char int8;
+typedef unsigned short uint16;
+typedef short int16;
+typedef unsigned int uint32;
+typedef int int32;
+
+#ifndef NULL
+#  define NULL ((void*) 0)
+#endif
+
+#ifndef __cplusplus
+#define true 1
+#define false 0
+#define inline __inline
+#endif
+
+// all wasm-app<->native shared source files should use wa_malloc/wa_free.
+// they will be mapped to different implementations in each side
+#ifndef wa_malloc
+#define wa_malloc malloc
+#endif
+
+#ifndef wa_free
+#define wa_free free
+#endif
+
+char *wa_strdup(const char *s);
+
+uint32 htonl(uint32 value);
+uint32 ntohl(uint32 value);
+uint16 htons(uint16 value);
+uint16 ntohs(uint16 value);
+
+int
+b_memcpy_s(void * s1, unsigned int s1max, const void * s2, unsigned int n);
+
+#endif /* DEPS_IWASM_APP_LIBS_BASE_BH_PLATFORM_H_ */

core/app-framework/base/app/req_resp_api.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _REQ_RESP_API_H_
+#define _REQ_RESP_API_H_
+
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool
+wasm_response_send(const char *buf, int size);
+
+void
+wasm_register_resource(const char *url);
+
+void
+wasm_post_request(const char *buf, int size);
+
+void
+wasm_sub_event(const char *url);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _REQ_RESP_API_H_ */
+

core/app-framework/base/app/request.c

@@ -0,0 +1,349 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "bi-inc/attr_container.h"
+#include "wa-inc/request.h"
+#include "wa-inc/timer_wasm_app.h"
+#include "bi-inc/shared_utils.h"
+#include "wasm_app.h"
+#include "req_resp_api.h"
+#include "timer_api.h"
+
+#define TRANSACTION_TIMEOUT_MS 5000
+
+typedef enum {
+    Reg_Event, Reg_Request
+} reg_type_t;
+
+typedef struct _res_register {
+    struct _res_register *next;
+    const char * url;
+    reg_type_t reg_type;
+    void (*request_handler)(request_t *);
+} res_register_t;
+
+typedef struct transaction {
+    struct transaction *next;
+    int mid;
+    unsigned int time; /* start time */
+    response_handler_f handler;
+    void *user_data;
+} transaction_t;
+
+static res_register_t * g_resources = NULL;
+
+static transaction_t *g_transactions = NULL;
+
+static user_timer_t g_trans_timer = NULL;
+
+static transaction_t *transaction_find(int mid)
+{
+    transaction_t *t = g_transactions;
+
+    while (t) {
+        if (t->mid == mid)
+            return t;
+        t = t->next;
+    }
+
+    return NULL;
+}
+
+/*
+ * new transaction is added to the tail of the list, so the list
+ * is sorted by expiry time naturally.
+ */
+static void transaction_add(transaction_t *trans)
+{
+    transaction_t *t;
+
+    if (g_transactions == NULL) {
+        g_transactions = trans;
+        return;
+    }
+
+    t = g_transactions;
+    while (t) {
+        if (t->next == NULL) {
+            t->next = trans;
+            return;
+        }
+    }
+}
+
+static void transaction_remove(transaction_t *trans)
+{
+    transaction_t *prev = NULL, *current = g_transactions;
+
+    while (current) {
+        if (current == trans) {
+            if (prev == NULL) {
+                g_transactions = current->next;
+                free(current);
+                return;
+            }
+            prev->next = current->next;
+            free(current);
+            return;
+        }
+        prev = current;
+        current = current->next;
+    }
+}
+
+static bool is_event_type(request_t * req)
+{
+    return req->action == COAP_EVENT;
+}
+
+static bool register_url_handler(const char *url,
+        request_handler_f request_handler, reg_type_t reg_type)
+{
+    res_register_t * r = g_resources;
+
+    while (r) {
+        if (reg_type == r->reg_type && strcmp(r->url, url) == 0) {
+            r->request_handler = request_handler;
+            return true;
+        }
+        r = r->next;
+    }
+
+    r = (res_register_t *) malloc(sizeof(res_register_t));
+    if (r == NULL)
+        return false;
+
+    memset(r, 0, sizeof(*r));
+
+    r->url = strdup(url);
+    if (!r->url) {
+        free(r);
+        return false;
+    }
+
+    r->request_handler = request_handler;
+    r->reg_type = reg_type;
+    r->next = g_resources;
+    g_resources = r;
+
+    // tell app mgr to route this url to me
+    if (reg_type == Reg_Request)
+        wasm_register_resource(url);
+    else
+        wasm_sub_event(url);
+
+    return true;
+}
+
+bool api_register_resource_handler(const char *url,
+                                   request_handler_f request_handler)
+{
+    return register_url_handler(url, request_handler, Reg_Request);
+}
+
+static void transaction_timeout_handler(user_timer_t timer)
+{
+    transaction_t *cur, *expired = NULL;
+    unsigned int elpased_ms, now = wasm_get_sys_tick_ms();
+
+    /*
+     * Since he transaction list is sorted by expiry time naturally,
+     * we can easily get all expired transactions.
+     * */
+    cur = g_transactions;
+    while (cur) {
+        if (now < cur->time)
+            elpased_ms = now + (0xFFFFFFFF - cur->time) + 1;
+        else
+            elpased_ms = now - cur->time;
+
+        if (elpased_ms >= TRANSACTION_TIMEOUT_MS) {
+            g_transactions = cur->next;
+            cur->next = expired;
+            expired = cur;
+            cur = g_transactions;
+        } else {
+            break;
+        }
+    }
+
+    /* call each transaction's handler with response set to NULL */
+    cur = expired;
+    while (cur) {
+        transaction_t *tmp = cur;
+        cur->handler(NULL, cur->user_data);
+        cur = cur->next;
+        free(tmp);
+    }
+
+    /*
+     * If the transaction list is not empty, restart the timer according
+     * to the first transaction. Otherwise, stop the timer.
+     */
+    if (g_transactions != NULL) {
+        unsigned int elpased_ms, ms_to_expiry, now = wasm_get_sys_tick_ms();
+        if (now < g_transactions->time) {
+            elpased_ms = now + (0xFFFFFFFF - g_transactions->time) + 1;
+        } else {
+            elpased_ms = now - g_transactions->time;
+        }
+        ms_to_expiry = TRANSACTION_TIMEOUT_MS - elpased_ms;
+        api_timer_restart(g_trans_timer, ms_to_expiry);
+    } else {
+        api_timer_cancel(g_trans_timer);
+        g_trans_timer = NULL;
+    }
+}
+
+void api_send_request(request_t * request, response_handler_f response_handler,
+        void * user_data)
+{
+    int size;
+    char *buffer;
+    transaction_t *trans;
+
+    if ((trans = (transaction_t *) malloc(sizeof(transaction_t))) == NULL) {
+        printf(
+                "send request: allocate memory for request transaction failed!\n");
+        return;
+    }
+
+    memset(trans, 0, sizeof(transaction_t));
+    trans->handler = response_handler;
+    trans->mid = request->mid;
+    trans->time = wasm_get_sys_tick_ms();
+    trans->user_data = user_data;
+
+    if ((buffer = pack_request(request, &size)) == NULL) {
+        printf("send request: pack request failed!\n");
+        free(trans);
+        return;
+    }
+
+    transaction_add(trans);
+
+    /* if the trans is the 1st one, start the timer */
+    if (trans == g_transactions) {
+        /* assert(g_trans_timer == NULL); */
+        if (g_trans_timer == NULL) {
+            g_trans_timer = api_timer_create(TRANSACTION_TIMEOUT_MS,
+            false,
+            true, transaction_timeout_handler);
+        }
+    }
+
+    wasm_post_request(buffer, size);
+
+    free_req_resp_packet(buffer);
+}
+
+/*
+ *
+ *  APIs for the native layers to callback for request/response arrived to this app
+ *
+ */
+
+void on_response(char * buffer, int size)
+{
+    response_t response[1];
+    transaction_t *trans;
+
+    if (NULL == unpack_response(buffer, size, response)) {
+        printf("unpack response failed\n");
+        return;
+    }
+
+    if ((trans = transaction_find(response->mid)) == NULL) {
+        printf("cannot find the transaction\n");
+        return;
+    }
+
+    /*
+     * When the 1st transaction get response:
+     * 1. If the 2nd trans exist, restart the timer according to its expiry time;
+     * 2. Otherwise, stop the timer since there is no more transactions;
+     */
+    if (trans == g_transactions) {
+        if (trans->next != NULL) {
+            unsigned int elpased_ms, ms_to_expiry, now = wasm_get_sys_tick_ms();
+            if (now < trans->next->time) {
+                elpased_ms = now + (0xFFFFFFFF - trans->next->time) + 1;
+            } else {
+                elpased_ms = now - trans->next->time;
+            }
+            ms_to_expiry = TRANSACTION_TIMEOUT_MS - elpased_ms;
+            api_timer_restart(g_trans_timer, ms_to_expiry);
+        } else {
+            api_timer_cancel(g_trans_timer);
+            g_trans_timer = NULL;
+        }
+    }
+
+    trans->handler(response, trans->user_data);
+    transaction_remove(trans);
+}
+
+void on_request(char *buffer, int size)
+{
+    request_t request[1];
+    bool is_event;
+    res_register_t *r = g_resources;
+
+    if (NULL == unpack_request(buffer, size, request)) {
+        printf("unpack request failed\n");
+        return;
+    }
+
+    is_event = is_event_type(request);
+
+    while (r) {
+        if ((is_event && r->reg_type == Reg_Event)
+                || (!is_event && r->reg_type == Reg_Request)) {
+            if (check_url_start(request->url, strlen(request->url), r->url)
+                    > 0) {
+                r->request_handler(request);
+                return;
+            }
+        }
+
+        r = r->next;
+    }
+
+    printf("on_request: exit. no service handler\n");
+}
+
+void api_response_send(response_t *response)
+{
+    int size;
+    char * buffer = pack_response(response, &size);
+    if (buffer == NULL)
+        return;
+
+    wasm_response_send(buffer, size);
+    free_req_resp_packet(buffer);
+}
+
+/// event api
+
+bool api_publish_event(const char *url, int fmt, void *payload, int payload_len)
+{
+    int size;
+    request_t request[1];
+    init_request(request, (char *)url, COAP_EVENT, fmt, payload, payload_len);
+    char * buffer = pack_request(request, &size);
+    if (buffer == NULL)
+        return false;
+    wasm_post_request(buffer, size);
+
+    free_req_resp_packet(buffer);
+
+    return true;
+}
+
+bool api_subscribe_event(const char * url, request_handler_f handler)
+{
+    return register_url_handler(url, handler, Reg_Event);
+}
+

core/app-framework/base/app/timer.c

@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "wa-inc/timer_wasm_app.h"
+#include "timer_api.h"
+
+#if 1
+#include <stdio.h>
+#else
+#define printf (...)
+#endif
+
+struct user_timer {
+    struct user_timer * next;
+    int timer_id;
+    void (*user_timer_callback)(user_timer_t);
+};
+
+struct user_timer * g_timers = NULL;
+
+user_timer_t api_timer_create(int interval, bool is_period, bool auto_start,
+        on_user_timer_update_f on_timer_update)
+{
+
+    int timer_id = wasm_create_timer(interval, is_period, auto_start);
+
+    //TODO
+    struct user_timer * timer = (struct user_timer *) malloc(
+            sizeof(struct user_timer));
+    if (timer == NULL) {
+        // TODO: remove the timer_id
+        printf("### api_timer_create malloc faild!!! \n");
+        return NULL;
+    }
+
+    memset(timer, 0, sizeof(*timer));
+    timer->timer_id = timer_id;
+    timer->user_timer_callback = on_timer_update;
+
+    if (g_timers == NULL)
+        g_timers = timer;
+    else {
+        timer->next = g_timers;
+        g_timers = timer;
+    }
+
+    return timer;
+}
+
+void api_timer_cancel(user_timer_t timer)
+{
+    user_timer_t t = g_timers, prev = NULL;
+
+    wasm_timer_cancel(timer->timer_id);
+
+    while (t) {
+        if (t == timer) {
+            if (prev == NULL) {
+                g_timers = t->next;
+                free(t);
+            } else {
+                prev->next = t->next;
+                free(t);
+            }
+            return;
+        } else {
+            prev = t;
+            t = t->next;
+        }
+    }
+}
+
+void api_timer_restart(user_timer_t timer, int interval)
+{
+    wasm_timer_restart(timer->timer_id, interval);
+}
+
+void on_timer_callback(int timer_id)
+{
+    struct user_timer * t = g_timers;
+
+    while (t) {
+        if (t->timer_id == timer_id) {
+            t->user_timer_callback(t);
+            break;
+        }
+        t = t->next;
+    }
+}
+

core/app-framework/base/app/timer_api.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _TIMER_API_H_
+#define _TIMER_API_H_
+
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef unsigned int timer_id_t;
+
+timer_id_t
+wasm_create_timer(int interval, bool is_period, bool auto_start);
+
+void
+wasm_timer_destroy(timer_id_t timer_id);
+
+void
+wasm_timer_cancel(timer_id_t timer_id);
+
+void
+wasm_timer_restart(timer_id_t timer_id, int interval);
+
+uint32
+wasm_get_sys_tick_ms(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _TIMER_API_H_ */
+

core/app-framework/base/app/wa-inc/request.h

@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _AEE_REQUEST_H_
+#define _AEE_REQUEST_H_
+
+#include "bi-inc/shared_utils.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* CoAP request method codes */
+typedef enum {
+    COAP_GET = 1,
+    COAP_POST,
+    COAP_PUT,
+    COAP_DELETE,
+    COAP_EVENT = (COAP_DELETE + 2)
+} coap_method_t;
+
+/* CoAP response codes */
+typedef enum {
+    NO_ERROR = 0,
+
+    CREATED_2_01 = 65, /* CREATED */
+    DELETED_2_02 = 66, /* DELETED */
+    VALID_2_03 = 67, /* NOT_MODIFIED */
+    CHANGED_2_04 = 68, /* CHANGED */
+    CONTENT_2_05 = 69, /* OK */
+    CONTINUE_2_31 = 95, /* CONTINUE */
+
+    BAD_REQUEST_4_00 = 128, /* BAD_REQUEST */
+    UNAUTHORIZED_4_01 = 129, /* UNAUTHORIZED */
+    BAD_OPTION_4_02 = 130, /* BAD_OPTION */
+    FORBIDDEN_4_03 = 131, /* FORBIDDEN */
+    NOT_FOUND_4_04 = 132, /* NOT_FOUND */
+    METHOD_NOT_ALLOWED_4_05 = 133, /* METHOD_NOT_ALLOWED */
+    NOT_ACCEPTABLE_4_06 = 134, /* NOT_ACCEPTABLE */
+    PRECONDITION_FAILED_4_12 = 140, /* BAD_REQUEST */
+    REQUEST_ENTITY_TOO_LARGE_4_13 = 141, /* REQUEST_ENTITY_TOO_LARGE */
+    UNSUPPORTED_MEDIA_TYPE_4_15 = 143, /* UNSUPPORTED_MEDIA_TYPE */
+
+    INTERNAL_SERVER_ERROR_5_00 = 160, /* INTERNAL_SERVER_ERROR */
+    NOT_IMPLEMENTED_5_01 = 161, /* NOT_IMPLEMENTED */
+    BAD_GATEWAY_5_02 = 162, /* BAD_GATEWAY */
+    SERVICE_UNAVAILABLE_5_03 = 163, /* SERVICE_UNAVAILABLE */
+    GATEWAY_TIMEOUT_5_04 = 164, /* GATEWAY_TIMEOUT */
+    PROXYING_NOT_SUPPORTED_5_05 = 165, /* PROXYING_NOT_SUPPORTED */
+
+    /* Erbium errors */
+    MEMORY_ALLOCATION_ERROR = 192, PACKET_SERIALIZATION_ERROR,
+
+    /* Erbium hooks */
+    MANUAL_RESPONSE, PING_RESPONSE
+} coap_status_t;
+
+
+/**
+ * @typedef request_handler_f
+ *
+ * @brief Define the signature of callback function for API
+ * api_register_resource_handler() to handle request or for API
+ * api_subscribe_event() to handle event.
+ *
+ * @param request pointer of the request to be handled
+ *
+ * @see api_register_resource_handler
+ * @see api_subscribe_event
+ */
+typedef void (*request_handler_f)(request_t *request);
+
+/**
+ * @typedef response_handler_f
+ *
+ * @brief Define the signature of callback function for API
+ * api_send_request() to handle response of a request.
+ *
+ * @param response pointer of the response to be handled
+ * @param user_data user data associated with the request which is set when
+ * calling api_send_request().
+ *
+ * @see api_send_request
+ */
+typedef void (*response_handler_f)(response_t *response, void *user_data);
+
+
+/*
+ *****************
+ * Request APIs
+ *****************
+ */
+
+/**
+ * @brief Register resource.
+ *
+ * @param url url of the resource
+ * @param handler callback function to handle the request to the resource
+ *
+ * @return true if success, false otherwise
+ */
+bool api_register_resource_handler(const char *url, request_handler_f handler);
+
+/**
+ * @brief Send request asynchronously.
+ *
+ * @param request pointer of the request to be sent
+ * @param response_handler callback function to handle the response
+ * @param user_data user data
+ */
+void api_send_request(request_t * request, response_handler_f response_handler,
+        void * user_data);
+
+/**
+ * @brief Send response.
+ *
+ * @param response pointer of the response to be sent
+ *
+ * @par
+ * @code
+ * void res1_handler(request_t *request)
+ * {
+ *     response_t response[1];
+ *     make_response_for_request(request, response);
+ *     set_response(response, DELETED_2_02, 0, NULL, 0);
+ *     api_response_send(response);
+ * }
+ * @endcode
+ */
+void api_response_send(response_t *response);
+
+
+/*
+ *****************
+ * Event APIs
+ *****************
+ */
+
+/**
+ * @brief Publish an event.
+ *
+ * @param url url of the event
+ * @param fmt format of the event payload
+ * @param payload payload of the event
+ * @param payload_len length in bytes of the event payload
+ *
+ * @return true if success, false otherwise
+ */
+bool api_publish_event(const char *url, int fmt, void *payload,
+        int payload_len);
+
+
+/**
+ * @brief Subscribe an event.
+ *
+ * @param url url of the event
+ * @param handler callback function to handle the event.
+ *
+ * @return true if success, false otherwise
+ */
+bool api_subscribe_event(const char * url, request_handler_f handler);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

core/app-framework/base/app/wa-inc/timer_wasm_app.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _AEE_TIMER_H_
+#define _AEE_TIMER_H_
+
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* board producer define user_timer */
+struct user_timer;
+typedef struct user_timer * user_timer_t;
+
+/**
+ * @typedef on_user_timer_update_f
+ *
+ * @brief Define the signature of callback function for API api_timer_create().
+ *
+ * @param timer the timer
+ *
+ * @see api_timer_create
+ */
+typedef void (*on_user_timer_update_f)(user_timer_t timer);
+
+/*
+ *****************
+ * Timer APIs
+ *****************
+ */
+
+/**
+ * @brief Create timer.
+ *
+ * @param interval timer interval
+ * @param is_period whether the timer is periodic
+ * @param auto_start whether start the timer immediately after created
+ * @param on_timer_update callback function called when timer expired
+ *
+ * @return the timer created if success, NULL otherwise
+ */
+user_timer_t api_timer_create(int interval, bool is_period, bool auto_start,
+        on_user_timer_update_f on_timer_update);
+
+/**
+ * @brief Cancel timer.
+ *
+ * @param timer the timer to cancel
+ */
+void api_timer_cancel(user_timer_t timer);
+
+/**
+ * @brief Restart timer.
+ *
+ * @param timer the timer to cancel
+ * @param interval the timer interval
+ */
+void api_timer_restart(user_timer_t timer, int interval);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

core/app-framework/base/app/wasm_app.cmake

@@ -0,0 +1,13 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+set (WASM_APP_BASE_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+include_directories(${WASM_APP_BASE_DIR})
+
+add_definitions (-DWASM_ENABLE_BASE_LIB)
+
+file (GLOB_RECURSE source_all ${WASM_APP_BASE_DIR}/*.c)
+
+set (WASM_APP_CURRENT_SOURCE ${source_all})
+set (WASM_APP_BASE_DIR ${WASM_APP_BASE_DIR} PARENT_SCOPE)

core/app-framework/base/app/wasm_app.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _LIB_AEE_H_
+#define _LIB_AEE_H_
+
+#include "bi-inc/shared_utils.h"
+#include "bi-inc/attr_container.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _LIB_AEE_H_ */

core/app-framework/base/native/base_lib_export.c

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "lib_export.h"
+#include "base_lib_export.h"
+
+static NativeSymbol extended_native_symbol_defs[] = {
+    /* TODO: use macro EXPORT_WASM_API() or EXPORT_WASM_API2() to
+       add functions to register. */
+    EXPORT_WASM_API(wasm_register_resource),
+    EXPORT_WASM_API(wasm_response_send),
+    EXPORT_WASM_API(wasm_post_request),
+    EXPORT_WASM_API(wasm_sub_event),
+    EXPORT_WASM_API(wasm_create_timer),
+    EXPORT_WASM_API(wasm_timer_destroy),
+    EXPORT_WASM_API(wasm_timer_cancel),
+    EXPORT_WASM_API(wasm_timer_restart),
+    EXPORT_WASM_API(wasm_get_sys_tick_ms),
+};
+
+int get_base_lib_export_apis(NativeSymbol **p_base_lib_apis)
+{
+    *p_base_lib_apis = extended_native_symbol_defs;
+    return sizeof(extended_native_symbol_defs) / sizeof(NativeSymbol);
+}
+

core/app-framework/base/native/base_lib_export.h

@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _BASE_LIB_EXPORT_H_
+#define _BASE_LIB_EXPORT_H_
+
+#include "bi-inc/attr_container.h"
+#include "native_interface.h"
+
+#endif /* end of _BASE_LIB_EXPORT_H_ */
+

core/app-framework/base/native/req_resp_api.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _REQ_RESP_API_H_
+#define _REQ_RESP_API_H_
+
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+bool
+wasm_response_send(int32 buf_offset, int size);
+
+void
+wasm_register_resource(int32 url_offset);
+
+void
+wasm_post_request(int32 buf_offset, int size);
+
+void
+wasm_sub_event(int32 url_offset);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _REQ_RESP_API_H_ */
+

core/app-framework/base/native/request_response.c

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "app_manager_export.h"
+#include "coap_ext.h"
+#include "wasm_export.h"
+#include "bh_assert.h"
+
+extern void module_request_handler(request_t *request, void *user_data);
+
+bool
+wasm_response_send(wasm_exec_env_t exec_env,
+                   int32 buffer_offset, int size)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    char *buffer = NULL;
+
+    if (!validate_app_addr(buffer_offset, size))
+        return false;
+
+    buffer = addr_app_to_native(buffer_offset);
+
+    if (buffer != NULL) {
+        response_t response[1];
+
+        if (NULL == unpack_response(buffer, size, response))
+            return false;
+
+        am_send_response(response);
+
+        return true;
+    }
+
+    return false;
+}
+
+void
+wasm_register_resource(wasm_exec_env_t exec_env, int32 url_offset)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    char *url = NULL;
+
+    if (!validate_app_str_addr(url_offset))
+        return;
+
+    url = addr_app_to_native(url_offset);
+
+    if (url != NULL) {
+        unsigned int mod_id = app_manager_get_module_id(Module_WASM_App,
+                                                        module_inst);
+        bh_assert(mod_id != ID_NONE);
+        am_register_resource(url, module_request_handler, mod_id);
+    }
+}
+
+void
+wasm_post_request(wasm_exec_env_t exec_env,
+                  int32 buffer_offset, int size)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    char *buffer = NULL;
+
+    if (!validate_app_addr(buffer_offset, size))
+        return;
+
+    buffer = addr_app_to_native(buffer_offset);
+
+    if (buffer != NULL) {
+        request_t req[1];
+
+        if (!unpack_request(buffer, size, req))
+            return;
+
+        // TODO: add permission check, ensure app can't do harm
+
+        // set sender to help dispatch the response to the sender ap
+        unsigned int mod_id = app_manager_get_module_id(Module_WASM_App,
+                                                        module_inst);
+        bh_assert(mod_id != ID_NONE);
+        req->sender = mod_id;
+
+        if (req->action == COAP_EVENT) {
+            am_publish_event(req);
+            return;
+        }
+
+        am_dispatch_request(req);
+    }
+}
+
+void
+wasm_sub_event(wasm_exec_env_t exec_env, int32 url_offset)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    char *url = NULL;
+
+    if (!validate_app_str_addr(url_offset))
+        return;
+
+    url = addr_app_to_native(url_offset);
+
+    if (url != NULL) {
+        unsigned int mod_id = app_manager_get_module_id(Module_WASM_App,
+                                                        module_inst);
+
+        bh_assert(mod_id != ID_NONE);
+        am_register_event(url, mod_id);
+    }
+}
+

core/app-framework/base/native/runtime_lib.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef LIB_BASE_RUNTIME_LIB_H_
+#define LIB_BASE_RUNTIME_LIB_H_
+
+
+#include "runtime_timer.h"
+
+void init_wasm_timer();
+void exit_wasm_timer();
+timer_ctx_t get_wasm_timer_ctx();
+timer_ctx_t create_wasm_timer_ctx(unsigned int module_id, int prealloc_num);
+void destroy_module_timer_ctx(unsigned int module_id);
+
+#endif /* LIB_BASE_RUNTIME_LIB_H_ */

core/app-framework/base/native/timer_api.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _TIMER_API_H_
+#define _TIMER_API_H_
+
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef unsigned int timer_id_t;
+
+timer_id_t
+wasm_create_timer(int interval, bool is_period, bool auto_start);
+
+void
+wasm_timer_destroy(timer_id_t timer_id);
+
+void
+wasm_timer_cancel(timer_id_t timer_id);
+
+void
+wasm_timer_restart(timer_id_t timer_id, int interval);
+
+uint32
+wasm_get_sys_tick_ms(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _TIMER_API_H_ */
+

core/app-framework/base/native/timer_wrapper.c

@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "runtime_timer.h"
+#include "app_manager_export.h"
+#include "module_wasm_app.h"
+#include "bh_list.h"
+#include "bh_thread.h"
+#include "bh_time.h"
+
+static bool timer_thread_run = true;
+
+bh_list g_timer_ctx_list;
+korp_cond g_timer_ctx_list_cond;
+korp_mutex g_timer_ctx_list_mutex;
+typedef struct {
+    bh_list_link l;
+    timer_ctx_t timer_ctx;
+} timer_ctx_node_t;
+
+void wasm_timer_callback(timer_id_t id, unsigned int mod_id)
+{
+    module_data* module = module_data_list_lookup_id(mod_id);
+    if (module == NULL)
+        return;
+
+    // !!! the length parameter must be 0, so the receiver will
+    //     not free the payload pointer.
+    bh_post_msg(module->queue, TIMER_EVENT_WASM, (char *)(uintptr_t)id, 0);
+}
+
+///
+/// why we create a separate link for module timer contexts
+/// rather than traverse the module list?
+/// It helps to reduce the lock frequency for the module list.
+/// Also when we lock the module list and then call the callback for
+/// timer expire, the callback is request the list lock again for lookup
+/// the module from module id. It is for avoiding that situation.
+
+void * thread_modulers_timer_check(void * arg)
+{
+    int ms_to_expiry;
+
+    while (timer_thread_run) {
+        ms_to_expiry = -1;
+        vm_mutex_lock(&g_timer_ctx_list_mutex);
+        timer_ctx_node_t* elem = (timer_ctx_node_t*)
+                                 bh_list_first_elem(&g_timer_ctx_list);
+        while (elem) {
+            int next = check_app_timers(elem->timer_ctx);
+            if (next != -1) {
+                if (ms_to_expiry == -1 || ms_to_expiry > next)
+                    ms_to_expiry = next;
+            }
+
+            elem = (timer_ctx_node_t*) bh_list_elem_next(elem);
+        }
+        vm_mutex_unlock(&g_timer_ctx_list_mutex);
+
+        if (ms_to_expiry == -1)
+            ms_to_expiry = 60 * 1000;
+        vm_mutex_lock(&g_timer_ctx_list_mutex);
+        vm_cond_reltimedwait(&g_timer_ctx_list_cond, &g_timer_ctx_list_mutex,
+                             ms_to_expiry);
+        vm_mutex_unlock(&g_timer_ctx_list_mutex);
+    }
+
+    return NULL;
+}
+
+void wakeup_modules_timer_thread(timer_ctx_t ctx)
+{
+    vm_mutex_lock(&g_timer_ctx_list_mutex);
+    vm_cond_signal(&g_timer_ctx_list_cond);
+    vm_mutex_unlock(&g_timer_ctx_list_mutex);
+}
+
+void init_wasm_timer()
+{
+    korp_tid tm_tid;
+    bh_list_init(&g_timer_ctx_list);
+
+    vm_cond_init(&g_timer_ctx_list_cond);
+    /* temp solution for: thread_modulers_timer_check thread would recursive lock the mutex */
+    vm_recursive_mutex_init(&g_timer_ctx_list_mutex);
+
+    vm_thread_create(&tm_tid, thread_modulers_timer_check,
+                     NULL, BH_APPLET_PRESERVED_STACK_SIZE);
+}
+
+void exit_wasm_timer()
+{
+    timer_thread_run = false;
+}
+
+timer_ctx_t create_wasm_timer_ctx(unsigned int module_id, int prealloc_num)
+{
+    timer_ctx_t ctx = create_timer_ctx(wasm_timer_callback,
+                                       wakeup_modules_timer_thread,
+                                       prealloc_num,
+                                       module_id);
+
+    if (ctx == NULL)
+        return NULL;
+
+    timer_ctx_node_t * node = (timer_ctx_node_t*)
+                              bh_malloc(sizeof(timer_ctx_node_t));
+    if (node == NULL) {
+        destroy_timer_ctx(ctx);
+        return NULL;
+    }
+    memset(node, 0, sizeof(*node));
+    node->timer_ctx = ctx;
+
+    vm_mutex_lock(&g_timer_ctx_list_mutex);
+    bh_list_insert(&g_timer_ctx_list, node);
+    vm_mutex_unlock(&g_timer_ctx_list_mutex);
+
+    return ctx;
+}
+
+void destroy_module_timer_ctx(unsigned int module_id)
+{
+    vm_mutex_lock(&g_timer_ctx_list_mutex);
+    timer_ctx_node_t* elem = (timer_ctx_node_t*)
+                             bh_list_first_elem(&g_timer_ctx_list);
+    while (elem) {
+        if (timer_ctx_get_owner(elem->timer_ctx) == module_id) {
+            bh_list_remove(&g_timer_ctx_list, elem);
+            destroy_timer_ctx(elem->timer_ctx);
+            bh_free(elem);
+            break;
+        }
+
+        elem = (timer_ctx_node_t*) bh_list_elem_next(elem);
+    }
+    vm_mutex_unlock(&g_timer_ctx_list_mutex);
+}
+
+timer_ctx_t get_wasm_timer_ctx(wasm_module_inst_t module_inst)
+{
+    module_data * m = app_manager_get_module_data(Module_WASM_App,
+                                                  module_inst);
+    if (m == NULL)
+        return NULL;
+    return m->timer_ctx;
+}
+
+timer_id_t
+wasm_create_timer(wasm_exec_env_t exec_env,
+                  int interval, bool is_period, bool auto_start)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
+    bh_assert(timer_ctx);
+    return sys_create_timer(timer_ctx, interval, is_period, auto_start);
+}
+
+void
+wasm_timer_destroy(wasm_exec_env_t exec_env, timer_id_t timer_id)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
+    bh_assert(timer_ctx);
+    sys_timer_destroy(timer_ctx, timer_id);
+}
+
+void
+wasm_timer_cancel(wasm_exec_env_t exec_env, timer_id_t timer_id)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
+    bh_assert(timer_ctx);
+    sys_timer_cancel(timer_ctx, timer_id);
+}
+
+void
+wasm_timer_restart(wasm_exec_env_t exec_env,
+                   timer_id_t timer_id, int interval)
+{
+    wasm_module_inst_t module_inst = get_module_inst(exec_env);
+    timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
+    bh_assert(timer_ctx);
+    sys_timer_restart(timer_ctx, timer_id, interval);
+}
+
+extern uint32 get_sys_tick_ms();
+
+uint32
+wasm_get_sys_tick_ms(wasm_exec_env_t exec_env)
+{
+    return (uint32) bh_get_tick_ms();
+}
+

core/app-framework/base/native/wasm_lib.cmake

@@ -0,0 +1,13 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+set (WASM_LIB_BASE_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+add_definitions (-DWASM_ENABLE_BASE_LIB)
+
+include_directories(${WASM_LIB_BASE_DIR})
+
+file (GLOB_RECURSE source_all ${WASM_LIB_BASE_DIR}/*.c)
+
+set (WASM_APP_LIB_CURRENT_SOURCE ${source_all})
+