Fix some compilation warnings and add esp-idf platform for experiment (#454)

And fix some code indent issues.

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

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "platform_api_vmcore.h"
+#include "platform_api_extension.h"
+
+
+int errno = 0;
+
+int
+os_thread_sys_init();
+
+void
+os_thread_sys_destroy();
+
+int
+bh_platform_init()
+{
+    return os_thread_sys_init();
+}
+
+void
+bh_platform_destroy()
+{
+    os_thread_sys_destroy();
+}
+
+int os_printf(const char *format, ...)
+{
+    int ret = 0;
+    va_list ap;
+
+    va_start(ap, format);
+    ret += vprintf(format, ap);
+    va_end(ap);
+
+    return ret;
+}
+
+int
+os_vprintf(const char *format, va_list ap)
+{
+    return vprintf(format, ap);
+}
+
+void *
+os_mmap(void *hint, size_t size, int prot, int flags)
+{
+
+    return BH_MALLOC(size);
+}
+
+void
+os_munmap(void *addr, size_t size)
+{
+    BH_FREE(addr);
+}
+
+int
+os_mprotect(void *addr, size_t size, int prot)
+{
+    return 0;
+}
+
+void
+os_dcache_flush()
+{
+}
+
+int
+atoi(const char *nptr)
+{
+    bool is_negative = false;
+    int total = 0;
+    const char *p = nptr;
+    char temp = '0';
+
+    if (NULL == p) {
+        os_printf("invlaid atoi input\n");
+        return 0;
+    }
+
+    if (*p == '-') {
+        is_negative = true;
+        p++;
+    }
+
+    while ((temp = *p++) != '\0') {
+        if (temp > '9' || temp < '0') {
+            continue;
+        }
+
+        total = total * 10 + (int)(temp - '0');
+    }
+
+    if (is_negative)
+        total = 0 - total;
+
+    return total;
+}
+
+void *
+memmove(void *dest, const void *src, size_t n)
+{
+    char *d = dest;
+    const char *s = src;
+
+    if (d < s) {
+        while (n--)
+            *d++ = *s++;
+    }
+    else {
+        const char *lasts = s + (n-1);
+        char *lastd = d + (n-1);
+        while (n--)
+            *lastd-- = *lasts--;
+    }
+    return dest;
+}
+

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

@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "platform_api_vmcore.h"
+#include "platform_api_extension.h"
+
+uint8 *os_thread_get_stack_boundary()
+{
+    /* TODO: implement os_thread_get_stack_boundary */
+    return NULL;
+}
+

core/shared/platform/esp-idf/platform_internal.h

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _PLATFORM_INTERNAL_H
+#define _PLATFORM_INTERNAL_H
+
+#include <stdint.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include <FreeRTOS.h>
+#include <semphr.h>
+#include <task.h>
+#include <os_api.h>
+
+#ifndef BH_PLATFORM_ESP_IDF
+#define BH_PLATFORM_ESP_IDF
+#endif
+
+#define BH_APPLET_PRESERVED_STACK_SIZE (2 * BH_KB)
+
+/* Default thread priority */
+#define BH_THREAD_DEFAULT_PRIORITY 5
+
+extern int errno;
+
+typedef TaskHandle_t korp_thread;
+typedef korp_thread korp_tid;
+typedef struct {
+    bool is_recursive;
+    SemaphoreHandle_t sem;
+} korp_mutex;
+
+struct os_thread_wait_node;
+typedef struct os_thread_wait_node *os_thread_wait_list;
+typedef struct korp_cond {
+    SemaphoreHandle_t wait_list_lock;
+    os_thread_wait_list thread_wait_list;
+} korp_cond;
+
+int os_printf(const char *format, ...);
+int os_vprintf(const char *format, va_list ap);
+
+/* math functions which are not provided by os */
+double sqrt(double x);
+double floor(double x);
+double ceil(double x);
+double fmin(double x, double y);
+double fmax(double x, double y);
+double rint(double x);
+double fabs(double x);
+double trunc(double x);
+float floorf(float x);
+float ceilf(float x);
+float fminf(float x, float y);
+float fmaxf(float x, float y);
+float rintf(float x);
+float truncf(float x);
+int signbit(double x);
+int isnan(double x);
+
+int atoi(const char *s);
+int strncasecmp(const char *s1, const char *s2, size_t n);
+long int strtol(const char *str, char **endptr, int base);
+unsigned long int strtoul(const char *str, char **endptr, int base);
+unsigned long long int strtoull(const char *nptr, char **endptr, int base);
+double strtod(const char *nptr, char **endptr);
+float strtof(const char *nptr, char **endptr);
+char *strstr(const char *haystack, const char *needle);
+size_t strspn(const char *s, const char *accept);
+size_t strcspn(const char *s, const char *reject);
+void *memchr(const void *s, int c, size_t n);
+int isalnum(int c);
+int isxdigit(int c);
+int isdigit(int c);
+int isprint(int c);
+int isgraph(int c);
+int isspace(int c);
+int isalpha(int c);
+int isupper(int c);
+int toupper(int c);
+int tolower(int c);
+void *memmove(void *dest, const void *src, size_t n);
+
+uint32_t htonl(uint32_t hostlong);
+uint16_t htons(uint16_t hostshort);
+uint32_t ntohl(uint32_t netlong);
+uint16_t ntohs(uint16_t netshort);
+
+#endif

core/shared/platform/esp-idf/shared_platform.cmake

@@ -0,0 +1,19 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+set (PLATFORM_SHARED_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+add_definitions(-DBH_PLATFORM_ESP_IDF)
+
+include_directories(${PLATFORM_SHARED_DIR})
+include_directories(${PLATFORM_SHARED_DIR}/../include)
+
+include (${CMAKE_CURRENT_LIST_DIR}/../common/freertos/platform_api_freertos.cmake)
+include (${CMAKE_CURRENT_LIST_DIR}/../common/math/platform_api_math.cmake)
+
+file (GLOB_RECURSE source_all ${PLATFORM_SHARED_DIR}/*.c)
+
+set (PLATFORM_SHARED_SOURCE ${source_all}
+                            ${PLATFORM_COMMON_MATH_SOURCE}
+                            ${PLATFORM_COMMON_FREERTOS_SOURCE})
+