Add multimemory example.
Add an example that deals with multiple memories in a single Wasm module.
This commit is contained in:
Peter Huene
327
examples/multimemory.c
Normal file
327
examples/multimemory.c
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@@ -0,0 +1,327 @@
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/*
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An example of how to interact with multiple memories.
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You can compile and run this example on Linux with:
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cargo build --release -p wasmtime-c-api
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cc examples/multimemory.c \
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-I crates/c-api/include \
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-I crates/c-api/wasm-c-api/include \
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target/release/libwasmtime.a \
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-lpthread -ldl -lm \
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-o multimemory
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./multimemory
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Note that on Windows and macOS the command will be similar, but you'll need
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to tweak the `-lpthread` and such annotations.
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*/
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wasm.h>
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#include <wasmtime.h>
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static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap);
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void check(bool success) {
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if (!success) {
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printf("> Error, expected success\n");
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exit(1);
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}
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}
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void check_call(wasmtime_context_t *store,
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wasmtime_func_t *func,
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const wasmtime_val_t* args,
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size_t nargs,
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int32_t expected) {
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wasmtime_val_t results[1];
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wasm_trap_t *trap = NULL;
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wasmtime_error_t *error = wasmtime_func_call(
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store, func, args, nargs, results, 1, &trap
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);
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if (error != NULL || trap != NULL)
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exit_with_error("failed to call function", error, trap);
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if (results[0].of.i32 != expected) {
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printf("> Error on result\n");
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exit(1);
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}
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}
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void check_call0(wasmtime_context_t *store, wasmtime_func_t *func, int32_t expected) {
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check_call(store, func, NULL, 0, expected);
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}
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void check_call1(wasmtime_context_t *store, wasmtime_func_t *func, int32_t arg, int32_t expected) {
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wasmtime_val_t args[1];
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args[0].kind = WASMTIME_I32;
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args[0].of.i32 = arg;
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check_call(store, func, args, 1, expected);
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}
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void check_call2(wasmtime_context_t *store, wasmtime_func_t *func, int32_t arg1, int32_t arg2, int32_t expected) {
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wasmtime_val_t args[2];
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args[0].kind = WASMTIME_I32;
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args[0].of.i32 = arg1;
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args[1].kind = WASMTIME_I32;
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args[1].of.i32 = arg2;
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check_call(store, func, args, 2, expected);
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}
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void check_ok(wasmtime_context_t *store, wasmtime_func_t *func, const wasmtime_val_t* args, size_t nargs) {
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wasm_trap_t *trap = NULL;
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wasmtime_error_t *error = wasmtime_func_call(store, func, args, nargs, NULL, 0, &trap);
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if (error != NULL || trap != NULL)
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exit_with_error("failed to call function", error, trap);
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}
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void check_ok2(wasmtime_context_t *store, wasmtime_func_t *func, int32_t arg1, int32_t arg2) {
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wasmtime_val_t args[2];
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args[0].kind = WASMTIME_I32;
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args[0].of.i32 = arg1;
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args[1].kind = WASMTIME_I32;
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args[1].of.i32 = arg2;
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check_ok(store, func, args, 2);
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}
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void check_trap(wasmtime_context_t *store,
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wasmtime_func_t *func,
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const wasmtime_val_t *args,
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size_t nargs,
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size_t num_results) {
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assert(num_results <= 1);
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wasmtime_val_t results[1];
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wasm_trap_t *trap = NULL;
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wasmtime_error_t *error = wasmtime_func_call(store, func, args, nargs, results, num_results, &trap);
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if (error != NULL)
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exit_with_error("failed to call function", error, NULL);
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if (trap == NULL) {
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printf("> Error on result, expected trap\n");
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exit(1);
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}
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wasm_trap_delete(trap);
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}
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void check_trap1(wasmtime_context_t *store, wasmtime_func_t *func, int32_t arg) {
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wasmtime_val_t args[1];
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args[0].kind = WASMTIME_I32;
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args[0].of.i32 = arg;
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check_trap(store, func, args, 1, 1);
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}
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void check_trap2(wasmtime_context_t *store, wasmtime_func_t *func, int32_t arg1, int32_t arg2) {
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wasmtime_val_t args[2];
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args[0].kind = WASMTIME_I32;
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args[0].of.i32 = arg1;
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args[1].kind = WASMTIME_I32;
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args[1].of.i32 = arg2;
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check_trap(store, func, args, 2, 0);
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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_config_t *config = wasm_config_new();
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assert(config != NULL);
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wasmtime_config_wasm_multi_memory_set(config, true);
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wasm_engine_t *engine = wasm_engine_new_with_config(config);
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assert(engine != NULL);
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wasmtime_store_t* store = wasmtime_store_new(engine, NULL, NULL);
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wasmtime_context_t *context = wasmtime_store_context(store);
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// Load our input file to parse it next
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FILE* file = fopen("examples/multimemory.wat", "r");
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if (!file) {
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printf("> Error loading file!\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 wat;
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wasm_byte_vec_new_uninitialized(&wat, file_size);
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if (fread(wat.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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// Parse the wat into the binary wasm format
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wasm_byte_vec_t binary;
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wasmtime_error_t *error = wasmtime_wat2wasm(wat.data, wat.size, &binary);
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if (error != NULL)
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exit_with_error("failed to parse wat", error, NULL);
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wasm_byte_vec_delete(&wat);
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// Compile.
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printf("Compiling module...\n");
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wasmtime_module_t* module = NULL;
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error = wasmtime_module_new(engine, (uint8_t*) binary.data, binary.size, &module);
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if (error)
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exit_with_error("failed to compile module", error, NULL);
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wasm_byte_vec_delete(&binary);
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// Instantiate.
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printf("Instantiating module...\n");
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wasmtime_instance_t instance;
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wasm_trap_t *trap = NULL;
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error = wasmtime_instance_new(context, module, NULL, 0, &instance, &trap);
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if (error != NULL || trap != NULL)
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exit_with_error("failed to instantiate", error, trap);
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wasmtime_module_delete(module);
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// Extract export.
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printf("Extracting exports...\n");
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wasmtime_memory_t memory0, memory1;
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wasmtime_func_t size0, load0, store0, size1, load1, store1;
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wasmtime_extern_t item;
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bool ok;
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ok = wasmtime_instance_export_get(context, &instance, "memory0", strlen("memory0"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_MEMORY);
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memory0 = item.of.memory;
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ok = wasmtime_instance_export_get(context, &instance, "size0", strlen("size0"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_FUNC);
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size0 = item.of.func;
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ok = wasmtime_instance_export_get(context, &instance, "load0", strlen("load0"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_FUNC);
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load0 = item.of.func;
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ok = wasmtime_instance_export_get(context, &instance, "store0", strlen("store0"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_FUNC);
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store0 = item.of.func;
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ok = wasmtime_instance_export_get(context, &instance, "memory1", strlen("memory1"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_MEMORY);
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memory1 = item.of.memory;
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ok = wasmtime_instance_export_get(context, &instance, "size1", strlen("size1"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_FUNC);
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size1 = item.of.func;
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ok = wasmtime_instance_export_get(context, &instance, "load1", strlen("load1"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_FUNC);
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load1 = item.of.func;
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ok = wasmtime_instance_export_get(context, &instance, "store1", strlen("store1"), &item);
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assert(ok && item.kind == WASMTIME_EXTERN_FUNC);
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store1 = item.of.func;
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// Check initial memory.
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printf("Checking memory...\n");
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check(wasmtime_memory_size(context, &memory0) == 2);
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check(wasmtime_memory_data_size(context, &memory0) == 0x20000);
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check(wasmtime_memory_data(context, &memory0)[0] == 0);
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check(wasmtime_memory_data(context, &memory0)[0x1000] == 1);
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check(wasmtime_memory_data(context, &memory0)[0x1001] == 2);
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check(wasmtime_memory_data(context, &memory0)[0x1002] == 3);
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check(wasmtime_memory_data(context, &memory0)[0x1003] == 4);
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check_call0(context, &size0, 2);
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check_call1(context, &load0, 0, 0);
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check_call1(context, &load0, 0x1000, 1);
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check_call1(context, &load0, 0x1001, 2);
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check_call1(context, &load0, 0x1002, 3);
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check_call1(context, &load0, 0x1003, 4);
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check_call1(context, &load0, 0x1ffff, 0);
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check_trap1(context, &load0, 0x20000);
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check(wasmtime_memory_size(context, &memory1) == 2);
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check(wasmtime_memory_data_size(context, &memory1) == 0x20000);
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check(wasmtime_memory_data(context, &memory1)[0] == 0);
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check(wasmtime_memory_data(context, &memory1)[0x1000] == 4);
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check(wasmtime_memory_data(context, &memory1)[0x1001] == 3);
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check(wasmtime_memory_data(context, &memory1)[0x1002] == 2);
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check(wasmtime_memory_data(context, &memory1)[0x1003] == 1);
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check_call0(context, &size1, 2);
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check_call1(context, &load1, 0, 0);
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check_call1(context, &load1, 0x1000, 4);
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check_call1(context, &load1, 0x1001, 3);
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check_call1(context, &load1, 0x1002, 2);
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check_call1(context, &load1, 0x1003, 1);
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check_call1(context, &load1, 0x1ffff, 0);
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check_trap1(context, &load1, 0x20000);
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// Mutate memory.
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printf("Mutating memory...\n");
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wasmtime_memory_data(context, &memory0)[0x1003] = 5;
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check_ok2(context, &store0, 0x1002, 6);
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check_trap2(context, &store0, 0x20000, 0);
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check(wasmtime_memory_data(context, &memory0)[0x1002] == 6);
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check(wasmtime_memory_data(context, &memory0)[0x1003] == 5);
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check_call1(context, &load0, 0x1002, 6);
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check_call1(context, &load0, 0x1003, 5);
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wasmtime_memory_data(context, &memory1)[0x1003] = 7;
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check_ok2(context, &store1, 0x1002, 8);
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check_trap2(context, &store1, 0x20000, 0);
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check(wasmtime_memory_data(context, &memory1)[0x1002] == 8);
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check(wasmtime_memory_data(context, &memory1)[0x1003] == 7);
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check_call1(context, &load1, 0x1002, 8);
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check_call1(context, &load1, 0x1003, 7);
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// Grow memory.
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printf("Growing memory...\n");
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uint32_t old_size;
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error = wasmtime_memory_grow(context, &memory0, 1, &old_size);
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if (error != NULL)
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exit_with_error("failed to grow memory", error, trap);
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check(wasmtime_memory_size(context, &memory0) == 3);
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check(wasmtime_memory_data_size(context, &memory0) == 0x30000);
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check_call1(context, &load0, 0x20000, 0);
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check_ok2(context, &store0, 0x20000, 0);
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check_trap1(context, &load0, 0x30000);
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check_trap2(context, &store0, 0x30000, 0);
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error = wasmtime_memory_grow(context, &memory0, 1, &old_size);
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assert(error != NULL);
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wasmtime_error_delete(error);
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error = wasmtime_memory_grow(context, &memory0, 0, &old_size);
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if (error != NULL)
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exit_with_error("failed to grow memory", error, trap);
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error = wasmtime_memory_grow(context, &memory1, 2, &old_size);
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if (error != NULL)
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exit_with_error("failed to grow memory", error, trap);
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check(wasmtime_memory_size(context, &memory1) == 4);
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check(wasmtime_memory_data_size(context, &memory1) == 0x40000);
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check_call1(context, &load1, 0x30000, 0);
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check_ok2(context, &store1, 0x30000, 0);
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check_trap1(context, &load1, 0x40000);
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check_trap2(context, &store1, 0x40000, 0);
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error = wasmtime_memory_grow(context, &memory1, 1, &old_size);
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assert(error != NULL);
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wasmtime_error_delete(error);
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error = wasmtime_memory_grow(context, &memory1, 0, &old_size);
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if (error != NULL)
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exit_with_error("failed to grow memory", error, trap);
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// Shut down.
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printf("Shutting down...\n");
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wasmtime_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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static void exit_with_error(const char *message, wasmtime_error_t *error, wasm_trap_t *trap) {
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fprintf(stderr, "error: %s\n", message);
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wasm_byte_vec_t error_message;
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if (error != NULL) {
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wasmtime_error_message(error, &error_message);
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wasmtime_error_delete(error);
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} else {
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wasm_trap_message(trap, &error_message);
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wasm_trap_delete(trap);
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}
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fprintf(stderr, "%.*s\n", (int) error_message.size, error_message.data);
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wasm_byte_vec_delete(&error_message);
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exit(1);
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}
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121
examples/multimemory.rs
Normal file
121
examples/multimemory.rs
Normal file
@@ -0,0 +1,121 @@
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//! An example of how to interact with multiple memories.
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//!
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//! Here a small wasm module with multiple memories is used to show how memory
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//! is initialized, how to read and write memory through the `Memory` object,
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//! and how wasm functions can trap when dealing with out-of-bounds addresses.
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// You can execute this example with `cargo run --example example`
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use anyhow::Result;
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use wasmtime::*;
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fn main() -> Result<()> {
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// Enable the multi-memory feature.
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let mut config = Config::new();
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config.wasm_multi_memory(true);
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let engine = Engine::new(&config)?;
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// Create our `store_fn` context and then compile a module and create an
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// instance from the compiled module all in one go.
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let mut store = Store::new(&engine, ());
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let module = Module::from_file(store.engine(), "examples/multimemory.wat")?;
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let instance = Instance::new(&mut store, &module, &[])?;
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let memory0 = instance
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.get_memory(&mut store, "memory0")
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.ok_or(anyhow::format_err!("failed to find `memory0` export"))?;
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let size0 = instance.get_typed_func::<(), i32, _>(&mut store, "size0")?;
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let load0 = instance.get_typed_func::<i32, i32, _>(&mut store, "load0")?;
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let store0 = instance.get_typed_func::<(i32, i32), (), _>(&mut store, "store0")?;
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let memory1 = instance
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.get_memory(&mut store, "memory1")
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.ok_or(anyhow::format_err!("failed to find `memory1` export"))?;
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let size1 = instance.get_typed_func::<(), i32, _>(&mut store, "size1")?;
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let load1 = instance.get_typed_func::<i32, i32, _>(&mut store, "load1")?;
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let store1 = instance.get_typed_func::<(i32, i32), (), _>(&mut store, "store1")?;
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println!("Checking memory...");
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assert_eq!(memory0.size(&store), 2);
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assert_eq!(memory0.data_size(&store), 0x20000);
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assert_eq!(memory0.data_mut(&mut store)[0], 0);
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assert_eq!(memory0.data_mut(&mut store)[0x1000], 1);
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assert_eq!(memory0.data_mut(&mut store)[0x1001], 2);
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assert_eq!(memory0.data_mut(&mut store)[0x1002], 3);
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assert_eq!(memory0.data_mut(&mut store)[0x1003], 4);
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assert_eq!(size0.call(&mut store, ())?, 2);
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assert_eq!(load0.call(&mut store, 0)?, 0);
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assert_eq!(load0.call(&mut store, 0x1000)?, 1);
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assert_eq!(load0.call(&mut store, 0x1001)?, 2);
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assert_eq!(load0.call(&mut store, 0x1002)?, 3);
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assert_eq!(load0.call(&mut store, 0x1003)?, 4);
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assert_eq!(load0.call(&mut store, 0x1ffff)?, 0);
|
||||
assert!(load0.call(&mut store, 0x20000).is_err()); // out of bounds trap
|
||||
|
||||
assert_eq!(memory1.size(&store), 2);
|
||||
assert_eq!(memory1.data_size(&store), 0x20000);
|
||||
assert_eq!(memory1.data_mut(&mut store)[0], 0);
|
||||
assert_eq!(memory1.data_mut(&mut store)[0x1000], 4);
|
||||
assert_eq!(memory1.data_mut(&mut store)[0x1001], 3);
|
||||
assert_eq!(memory1.data_mut(&mut store)[0x1002], 2);
|
||||
assert_eq!(memory1.data_mut(&mut store)[0x1003], 1);
|
||||
|
||||
assert_eq!(size1.call(&mut store, ())?, 2);
|
||||
assert_eq!(load1.call(&mut store, 0)?, 0);
|
||||
assert_eq!(load1.call(&mut store, 0x1000)?, 4);
|
||||
assert_eq!(load1.call(&mut store, 0x1001)?, 3);
|
||||
assert_eq!(load1.call(&mut store, 0x1002)?, 2);
|
||||
assert_eq!(load1.call(&mut store, 0x1003)?, 1);
|
||||
assert_eq!(load1.call(&mut store, 0x1ffff)?, 0);
|
||||
assert!(load0.call(&mut store, 0x20000).is_err()); // out of bounds trap
|
||||
|
||||
println!("Mutating memory...");
|
||||
memory0.data_mut(&mut store)[0x1003] = 5;
|
||||
|
||||
store0.call(&mut store, (0x1002, 6))?;
|
||||
assert!(store0.call(&mut store, (0x20000, 0)).is_err()); // out of bounds trap
|
||||
|
||||
assert_eq!(memory0.data(&store)[0x1002], 6);
|
||||
assert_eq!(memory0.data(&store)[0x1003], 5);
|
||||
assert_eq!(load0.call(&mut store, 0x1002)?, 6);
|
||||
assert_eq!(load0.call(&mut store, 0x1003)?, 5);
|
||||
|
||||
memory1.data_mut(&mut store)[0x1003] = 7;
|
||||
|
||||
store1.call(&mut store, (0x1002, 8))?;
|
||||
assert!(store1.call(&mut store, (0x20000, 0)).is_err()); // out of bounds trap
|
||||
|
||||
assert_eq!(memory1.data(&store)[0x1002], 8);
|
||||
assert_eq!(memory1.data(&store)[0x1003], 7);
|
||||
assert_eq!(load1.call(&mut store, 0x1002)?, 8);
|
||||
assert_eq!(load1.call(&mut store, 0x1003)?, 7);
|
||||
|
||||
println!("Growing memory...");
|
||||
memory0.grow(&mut store, 1)?;
|
||||
assert_eq!(memory0.size(&store), 3);
|
||||
assert_eq!(memory0.data_size(&store), 0x30000);
|
||||
|
||||
assert_eq!(load0.call(&mut store, 0x20000)?, 0);
|
||||
store0.call(&mut store, (0x20000, 0))?;
|
||||
assert!(load0.call(&mut store, 0x30000).is_err());
|
||||
assert!(store0.call(&mut store, (0x30000, 0)).is_err());
|
||||
|
||||
assert!(memory0.grow(&mut store, 1).is_err());
|
||||
assert!(memory0.grow(&mut store, 0).is_ok());
|
||||
|
||||
memory1.grow(&mut store, 2)?;
|
||||
assert_eq!(memory1.size(&store), 4);
|
||||
assert_eq!(memory1.data_size(&store), 0x40000);
|
||||
|
||||
assert_eq!(load1.call(&mut store, 0x30000)?, 0);
|
||||
store1.call(&mut store, (0x30000, 0))?;
|
||||
assert!(load1.call(&mut store, 0x40000).is_err());
|
||||
assert!(store1.call(&mut store, (0x40000, 0)).is_err());
|
||||
|
||||
assert!(memory1.grow(&mut store, 1).is_err());
|
||||
assert!(memory1.grow(&mut store, 0).is_ok());
|
||||
|
||||
Ok(())
|
||||
}
|
||||
28
examples/multimemory.wat
Normal file
28
examples/multimemory.wat
Normal file
@@ -0,0 +1,28 @@
|
||||
(module
|
||||
(memory (export "memory0") 2 3)
|
||||
(memory (export "memory1") 2 4)
|
||||
|
||||
(func (export "size0") (result i32) (memory.size 0))
|
||||
(func (export "load0") (param i32) (result i32)
|
||||
local.get 0
|
||||
i32.load8_s (memory 0)
|
||||
)
|
||||
(func (export "store0") (param i32 i32)
|
||||
local.get 0
|
||||
local.get 1
|
||||
i32.store8 (memory 0)
|
||||
)
|
||||
(func (export "size1") (result i32) (memory.size 1))
|
||||
(func (export "load1") (param i32) (result i32)
|
||||
local.get 0
|
||||
i32.load8_s (memory 1)
|
||||
)
|
||||
(func (export "store1") (param i32 i32)
|
||||
local.get 0
|
||||
local.get 1
|
||||
i32.store8 (memory 1)
|
||||
)
|
||||
|
||||
(data (memory 0) (i32.const 0x1000) "\01\02\03\04")
|
||||
(data (memory 1) (i32.const 0x1000) "\04\03\02\01")
|
||||
)
|
||||
Reference in New Issue
Block a user