912b3912b4
Plus a script to compile/link/run them. Change-Id: Iac8ffcda3a73902261c07a7b4e5d967a19414c75 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1564058 Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Reviewed-by: Michael Achenbach <machenbach@chromium.org> Cr-Commit-Position: refs/heads/master@{#60911}
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include "wasm.h"
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#define own
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// A function to be called from Wasm code.
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own wasm_trap_t* hello_callback(
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const wasm_val_t args[], wasm_val_t results[]
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) {
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printf("Calling back...\n");
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printf("> Hello World!\n");
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return NULL;
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}
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int main(int argc, const char* argv[]) {
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// Initialize.
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printf("Initializing...\n");
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wasm_engine_t* engine = wasm_engine_new();
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wasm_store_t* store = wasm_store_new(engine);
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// Load binary.
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printf("Loading binary...\n");
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FILE* file = fopen("hello.wasm", "r");
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if (!file) {
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printf("> Error loading module!\n");
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return 1;
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}
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fseek(file, 0L, SEEK_END);
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size_t file_size = ftell(file);
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fseek(file, 0L, SEEK_SET);
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wasm_byte_vec_t binary;
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wasm_byte_vec_new_uninitialized(&binary, file_size);
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if (fread(binary.data, file_size, 1, file) != 1) {
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printf("> Error loading module!\n");
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return 1;
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}
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fclose(file);
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// Compile.
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printf("Compiling module...\n");
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own wasm_module_t* module = wasm_module_new(store, &binary);
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if (!module) {
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printf("> Error compiling module!\n");
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return 1;
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}
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wasm_byte_vec_delete(&binary);
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// Create external print functions.
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printf("Creating callback...\n");
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own wasm_functype_t* hello_type = wasm_functype_new_0_0();
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own wasm_func_t* hello_func =
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wasm_func_new(store, hello_type, hello_callback);
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wasm_functype_delete(hello_type);
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// Instantiate.
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printf("Instantiating module...\n");
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const wasm_extern_t* imports[] = { wasm_func_as_extern(hello_func) };
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own wasm_instance_t* instance = wasm_instance_new(store, module, imports);
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if (!instance) {
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printf("> Error instantiating module!\n");
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return 1;
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}
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wasm_func_delete(hello_func);
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// Extract export.
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printf("Extracting export...\n");
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own wasm_extern_vec_t exports;
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wasm_instance_exports(instance, &exports);
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if (exports.size == 0) {
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printf("> Error accessing exports!\n");
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return 1;
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}
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const wasm_func_t* run_func = wasm_extern_as_func(exports.data[0]);
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if (run_func == NULL) {
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printf("> Error accessing export!\n");
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return 1;
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}
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wasm_module_delete(module);
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wasm_instance_delete(instance);
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// Call.
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printf("Calling export...\n");
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if (wasm_func_call(run_func, NULL, NULL)) {
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printf("> Error calling function!\n");
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return 1;
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}
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wasm_extern_vec_delete(&exports);
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// Shut down.
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printf("Shutting down...\n");
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wasm_store_delete(store);
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wasm_engine_delete(engine);
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// All done.
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printf("Done.\n");
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return 0;
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}
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