Add shared heap sample (#3806)

samples/shared-heap/wasm-apps/CMakeLists.txt

@@ -0,0 +1,43 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+cmake_minimum_required(VERSION 3.14)
+project(wasm-apps)
+
+set(WAMR_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../..)
+
+if (APPLE)
+  set (HAVE_FLAG_SEARCH_PATHS_FIRST 0)
+  set (CMAKE_C_LINK_FLAGS "")
+  set (CMAKE_CXX_LINK_FLAGS "")
+endif ()
+
+set (CMAKE_SYSTEM_PROCESSOR wasm32)
+set (CMAKE_SYSROOT ${WAMR_ROOT_DIR}/wamr-sdk/app/libc-builtin-sysroot)
+
+if (NOT DEFINED WASI_SDK_DIR)
+  set (WASI_SDK_DIR "/opt/wasi-sdk")
+endif ()
+
+set (CMAKE_C_FLAGS "-nostdlib -Qunused-arguments -z stack-size=32768")
+set (CMAKE_C_COMPILER_TARGET "wasm32")
+set (CMAKE_C_COMPILER "${WASI_SDK_DIR}/bin/clang")
+
+set (DEFINED_SYMBOLS "${WAMR_ROOT_DIR}/wamr-sdk/app/libc-builtin-sysroot/share/defined-symbols.txt")
+
+set (CMAKE_EXE_LINKER_FLAGS
+     "-Wl,--initial-memory=65536,                  \
+      -Wl,--no-entry,--strip-all,                  \
+      -Wl,--export=__heap_base,--export=__data_end \
+      -Wl,--export=__wasm_call_ctors               \
+      -Wl,--export=my_shared_malloc                \
+      -Wl,--export=my_shared_free                  \
+      -Wl,--export=print_buf                       \
+      -Wl,--allow-undefined"
+)
+
+add_executable(test1.wasm test1.c)
+target_link_libraries(test1.wasm)
+
+add_executable(test2.wasm test2.c)
+target_link_libraries(test2.wasm)

samples/shared-heap/wasm-apps/test1.c

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+extern void *
+shared_malloc(uint32_t size);
+extern void
+shared_free(void *ptr);
+
+void *
+my_shared_malloc(uint32_t size, uint32_t index)
+{
+    char *buf = shared_malloc(size);
+
+    if (buf)
+        snprintf(buf, 1024, "Hello, this is buf %u allocated from shared heap",
+                 index);
+
+    return buf;
+}
+
+void
+my_shared_free(void *ptr)
+{
+    shared_free(ptr);
+}

samples/shared-heap/wasm-apps/test2.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include <stdio.h>
+
+#include <stdio.h>
+
+extern void
+shared_free(void *ptr);
+
+void
+print_buf(char *buf)
+{
+    printf("wasm app2's wasm func received buf: %s\n\n", buf);
+    shared_free(buf);
+}