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344 lines
12 KiB
344 lines
12 KiB
/*
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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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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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You can also build using cmake:
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mkdir build && cd build && cmake .. && \
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cmake --build . --target wasmtime-multimemory
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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,
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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, wasmtime_func_t *func,
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const wasmtime_val_t *args, size_t nargs, 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 =
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wasmtime_func_call(store, func, args, nargs, results, 1, &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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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,
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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,
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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,
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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,
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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 =
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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,
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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, wasmtime_func_t *func,
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const wasmtime_val_t *args, size_t nargs, 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 =
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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,
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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,
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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 =
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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",
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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",
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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",
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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",
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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",
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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",
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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",
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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",
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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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uint64_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,
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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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