examples/runwasi_cstruct: add an example to use the output of wasm2cs…

…truct

examples/runwasi_cstruct/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.16)
+
+include(../../cmake/LLVM.cmake)
+
+project(runwasi_cstruct LANGUAGES C)
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wvla -Werror")
+
+find_package(toywasm-lib-core REQUIRED)
+find_package(toywasm-lib-wasi REQUIRED)
+
+# REVISIT: make runwasi.[ch] a library?
+
+set(sources
+	"../runwasi/runwasi.c"
+	"../runwasi/runwasi_cli_args.c"
+	"main.c"
+	"module.c"
+)
+
+add_executable(runwasi_cstruct ${sources})
+target_link_libraries(runwasi_cstruct toywasm-lib-core toywasm-lib-wasi m)
+target_include_directories(runwasi_cstruct PRIVATE "../runwasi")

examples/runwasi_cstruct/build.sh

@@ -0,0 +1,6 @@
+#! /bin/sh
+
+set -e
+
+TOYWASM_EXTRA_CMAKE_OPTIONS="-DTOYWASM_ENABLE_WASM_THREADS=ON -DTOYWASM_ENABLE_WASM_TAILCALL=ON" \
+../build-toywasm-and-app.sh

examples/runwasi_cstruct/main.c

@@ -0,0 +1,51 @@
+/*
+ * an example app to run a wasi command.
+ *
+ * usage:
+ * % runwasi --dir=. --env=a=b -- foo.wasm -x -y
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <toywasm/mem.h>
+#include <toywasm/xlog.h>
+
+#include "runwasi.h"
+#include "runwasi_cli_args.h"
+
+extern const struct module g_wasm_module;
+
+int
+main(int argc, char **argv)
+{
+        struct runwasi_cli_args a0;
+        struct runwasi_cli_args *a = &a0;
+        uint32_t wasi_exit_code;
+        int ret;
+        const int stdio_fds[3] = {
+                STDIN_FILENO,
+                STDOUT_FILENO,
+                STDERR_FILENO,
+        };
+        ret = runwasi_cli_args_parse(argc, argv, a);
+        if (ret != 0) {
+                xlog_error("failed to process cli arguments");
+                exit(1);
+        }
+        struct mem_context mctx;
+        mem_context_init(&mctx);
+        ret = runwasi_module(&mctx, &g_wasm_module, a->ndirs, a->dirs, a->nenvs,
+                      (const char *const *)a->envs, a->argc,
+                      (const char *const *)a->argv, stdio_fds, NULL,
+                      &wasi_exit_code);
+        mem_context_clear(&mctx);
+        free(a->dirs);
+        free(a->envs);
+        if (ret != 0) {
+                exit(1);
+        }
+        exit(wasi_exit_code);
+}