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re-organized the readme (#111)

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* Update README.md

* re-organize the readme

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* Update README.md
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Wang Xin
2019-09-07 14:27:11 +08:00
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parent 8deef78624
commit efd809756a
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Embed WAMR into software production
=====================================
![WAMR embed diagram](./pics/embed.PNG "WAMR embed architecture diagram")
A typical WAMR API usage is shown below (some return value checks are ignored):
``` C
static char global_heap_buf[512 * 1024];
char *buffer;
wasm_module_t module;
wasm_module_inst_t inst;
wasm_function_inst_t func;
wasm_exec_env_t env;
uint32 argv[2];
bh_memory_init_with_pool(global_heap_buf, sizeof(global_heap_buf));
wasm_runtime_init();
buffer = read_wasm_binary_to_buffer(…);
module = wasm_runtime_load(buffer, size, err, err_size);
inst = wasm_runtime_instantiate(module, 0, 0, err, err_size);
func = wasm_runtime_lookup_function(inst, "fib", "(i32)i32");
env = wasm_runtime_create_exec_env(stack_size);
argv[0] = 8;
if (!wasm_runtime_call_wasm(inst, env, func, 1, argv_buf) ) {
wasm_runtime_clear_exception(inst);
}
/* the return value is stored in argv[0] */
printf("fib function return: %d\n", argv[0]);
wasm_runtime_destory_exec_env(env);
wasm_runtime_deinstantiate(inst);
wasm_runtime_unload(module);
wasm_runtime_destroy();
bh_memory_destroy();
```