--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <libgen.h>
+#include <dlfcn.h>
+#include "common/err.h"
+#include "common/str.h"
+#include "load.h"
+#include "parse.h"
+
+#define DEBUG 0
+
+// helper functions
+
+static char *wrap_name_func(const char *name, char *(*fn)(char *))
+{
+ char *copy = strdup(name);
+ char *result = fn(copy);
+ char *result_copy = strdup(result);
+
+ free(copy);
+ return result_copy;
+}
+
+static char *basename_wrapper(const char *name)
+{
+ return wrap_name_func(name, &basename);
+}
+
+static char *dirname_wrapper(const char *name)
+{
+ return wrap_name_func(name, &dirname);
+}
+
+static bool file_exists(const char *filename)
+{
+ FILE *f = fopen(filename, "r");
+
+ if (f) {
+ fclose(f);
+ return true;
+ }
+
+ return false;
+}
+
+// type definitions
+
+typedef struct
+{
+ char *name;
+ UwUVMFunction *ref;
+} FunctionLink;
+
+typedef struct
+{
+ char *path; // path without file extension
+ char *filename; // path with file extension
+ char *environment; // directory path
+
+ UwUVMModuleType type; // native (.so) or plain (.uwu)
+
+ FunctionLink *functions; // required functions
+ size_t num_functions; // number of required functions
+ size_t loaded_functions; // number of loaded functions (<= num_functions)
+
+ union
+ {
+ AbstractSyntaxTree ast; // abstract syntax tree generated by parser (for plain modules)
+ void *lib; // dlopen() shared object handle (for native modules)
+ } handle;
+} Module;
+
+typedef struct
+{
+ Module **modules; // loaded modules
+ size_t num_modules; // count for modules
+
+ char *std_path; // path to standard library
+
+ Program program; // the result program
+} LoadState;
+
+// functions
+
+// returns mallocated string
+static inline char *get_filename(const char *module_path)
+{
+ const char *try_names[3] = {
+ "%s",
+ "%s.uwu",
+ "%s.so",
+ };
+
+ char *filename;
+
+ for (int i = 0; i < 3; i++) {
+ filename = asprintf_wrapper(try_names[i], module_path);
+
+ if (file_exists(filename))
+ return filename;
+ else
+ free(filename);
+ }
+
+ return NULL;
+}
+
+// module_path is a mallocated string
+static Module *require_module(LoadState *state, char *module_path)
+{
+ for (size_t i = 0; i < state->num_modules; i++) {
+ Module *module = state->modules[i];
+
+ if (strcmp(module_path, module->path) == 0) {
+ free(module_path);
+ return module;
+ }
+ }
+
+ char *filename = get_filename(module_path);
+
+ if (! filename)
+ error("error: module %s not found\n", module_path);
+
+ size_t filename_len = strlen(filename);
+ UwUVMModuleType type = (filename_len >= 3 && strcmp(filename + filename_len - 3, ".so") == 0) ? MODULE_NATIVE : MODULE_PLAIN;
+
+ state->modules = realloc(state->modules, sizeof *state->modules * ++state->num_modules);
+ Module *module = state->modules[state->num_modules - 1] = malloc(sizeof *module);
+
+ *module = (Module) {
+ .path = module_path,
+ .filename = filename,
+ .environment = dirname_wrapper(module_path),
+
+ .type = type,
+
+ .functions = NULL,
+ .num_functions = 0,
+ .loaded_functions = 0,
+ };
+
+ if (type == MODULE_PLAIN) {
+ module->handle.ast = parse_file(filename);
+ } else {
+ state->program.libraries = realloc(state->program.libraries, sizeof(void *) * ++state->program.num_libraries);
+ state->program.libraries[state->program.num_libraries - 1] = module->handle.lib = dlopen(filename, RTLD_LAZY);
+
+ char *err = dlerror();
+ if (err)
+ error("library error: %s\n", err);
+ }
+
+ return module;
+}
+
+static UwUVMFunction *require_function(LoadState *state, Module *module, const char *name)
+{
+ for (size_t i = 0; i < module->num_functions; i++) {
+ FunctionLink *link = &module->functions[i];
+
+ if (strcmp(link->name, name) == 0)
+ return link->ref;
+ }
+
+ UwUVMFunction *ref = malloc(sizeof *ref);
+ ref->type = module->type;
+
+ state->program.functions = realloc(state->program.functions, sizeof *state->program.functions * ++state->program.num_functions);
+ state->program.functions[state->program.num_functions - 1] = ref;
+
+ module->functions = realloc(module->functions, sizeof *module->functions * ++module->num_functions);
+ module->functions[module->num_functions - 1] = (FunctionLink) {
+ .name = strdup(name),
+ .ref = ref,
+ };
+
+ return ref;
+}
+
+static UwUVMFunction *resolve_function(LoadState *state, Module *caller_module, const char *full_name)
+{
+ size_t len = strlen(full_name);
+
+ const char *fnname;
+ for (fnname = &full_name[len - 1]; *fnname != ':' && fnname > full_name; fnname--)
+ ;
+
+ if (*fnname == ':')
+ fnname++;
+
+ if (*fnname == '\0')
+ error("error: empty function name\n");
+
+ Module *callee_module;
+
+ if (fnname == full_name) {
+ callee_module = caller_module;
+ } else {
+ const char *caller_path = caller_module->environment;
+ const char *callee_name = full_name;
+
+ if (*callee_name == ':') {
+ caller_path = state->std_path;
+ callee_name++;
+ }
+
+ size_t path_len = fnname - callee_name;
+ char callee_path[path_len];
+
+ for (size_t i = 0; i < path_len; i++)
+ callee_path[i] = (i == path_len - 1) ? '\0'
+ : (callee_name[i] == ':') ? '/'
+ : callee_name[i];
+
+ callee_module = require_module(state, asprintf_wrapper("%s/%s", caller_path, callee_path));
+ }
+
+ return require_function(state, callee_module, fnname);
+}
+
+static void translate_expression(LoadState *state, Module *module, UwUVMExpression *vm_expr, ParseExpression *parse_expr)
+{
+ UwUVMFunction *vm_function;
+
+ if (parse_expr->type == EX_FNNAME || parse_expr->type == EX_FNCALL) {
+ vm_function = resolve_function(state, module, parse_expr->value.str_value);
+ free(parse_expr->value.str_value);
+ }
+
+ switch (vm_expr->type = parse_expr->type) {
+ case EX_INTLIT:
+ case EX_ARGNUM:
+ vm_expr->value.int_value = parse_expr->value.int_value;
+ break;
+
+ case EX_STRLIT:
+ vm_expr->value.str_value = parse_expr->value.str_value;
+ break;
+
+ case EX_FNNAME:
+ vm_expr->value.ref_value = vm_function;
+ break;
+
+ case EX_FNCALL:
+ vm_expr->value.cll_value.function = vm_function;
+ vm_expr->value.cll_value.args = malloc(sizeof(UwUVMExpression) * parse_expr->num_children);
+ vm_expr->value.cll_value.num_args = parse_expr->num_children;
+
+ for (size_t i = 0; i < parse_expr->num_children; i++)
+ translate_expression(state, module, &vm_expr->value.cll_value.args[i], parse_expr->children[i]);
+
+ if (parse_expr->children)
+ free(parse_expr->children);
+ break;
+
+ default:
+ break;
+ }
+
+ free(parse_expr);
+}
+
+static void load_functions(LoadState *state, Module *module)
+{
+ for (; module->loaded_functions < module->num_functions; module->loaded_functions++) {
+ FunctionLink *link = &module->functions[module->loaded_functions];
+
+ if (module->type == MODULE_PLAIN) {
+ ParseFunction **function = NULL;
+
+ for (size_t i = 0; i < module->handle.ast.num_functions; i++) {
+ ParseFunction **fn = &module->handle.ast.functions[i];
+
+ if (*fn && strcmp((*fn)->name, link->name) == 0) {
+ function = fn;
+ break;
+ }
+ }
+
+ if (function) {
+ translate_expression(state, module, link->ref->value.plain = malloc(sizeof(UwUVMExpression)), (*function)->expression);
+ free((*function)->name);
+ free(*function);
+
+ *function = NULL;
+ } else {
+ error("error: no function %s in module %s\n", link->name, module->filename);
+ }
+ } else {
+ char *symbol = asprintf_wrapper("uwu_%s", link->name);
+ link->ref->value.native = dlsym(module->handle.lib, symbol);
+
+ char *err = dlerror();
+ if (err)
+ error("library error: %s\n", err);
+
+ free(symbol);
+ }
+ }
+}
+
+static void free_expression(ParseExpression *expr)
+{
+ if (expr->type == EX_FNCALL) {
+ for (size_t i = 0; i < expr->num_children; i++)
+ free_expression(expr->children[i]);
+
+ if (expr->children)
+ free(expr->children);
+ }
+
+ if (expr->type != EX_INTLIT && expr->type != EX_ARGNUM)
+ free(expr->value.str_value);
+
+ free(expr);
+}
+
+Program load_program(const char *progname, const char *modname)
+{
+ char *prog_dirname = dirname_wrapper(progname);
+ char *api_path = asprintf_wrapper("%s/api/api.so", prog_dirname);
+
+ LoadState state = {
+ .modules = NULL,
+ .num_modules = 0,
+ .std_path = asprintf_wrapper("%s/std", prog_dirname),
+ .program = {
+ .api_library = dlopen(api_path, RTLD_NOW | RTLD_GLOBAL),
+ .main_function = NULL,
+ .functions = NULL,
+ .num_functions = 0,
+ .libraries = NULL,
+ .num_libraries = 0,
+ },
+ };
+
+ free(prog_dirname);
+ free(api_path);
+
+ state.program.main_function = require_function(&state, require_module(&state, strdup(modname)), "main");
+
+ while (true) {
+ bool fully_loaded = true;
+
+ for (size_t i = 0; i < state.num_modules; i++) {
+ Module *module = state.modules[i];
+
+#if DEBUG
+ printf("%s %lu/%lu\n", module->filename, module->loaded_functions, module->num_functions);
+#endif
+
+ if (module->loaded_functions < module->num_functions) {
+ fully_loaded = false;
+ load_functions(&state, module);
+ }
+ }
+
+ if (fully_loaded)
+ break;
+ }
+
+ free(state.std_path);
+
+ for (size_t i = 0; i < state.num_modules; i++) {
+ Module *module = state.modules[i];
+
+ free(module->path);
+ free(module->filename);
+ free(module->environment);
+
+ for (size_t f = 0; f < module->num_functions; f++)
+ free(module->functions[f].name);
+
+ free(module->functions);
+
+ if (module->type == MODULE_PLAIN) {
+ for (size_t f = 0; f < module->handle.ast.num_functions; f++) {
+ ParseFunction *function = module->handle.ast.functions[f];
+
+ if (function) {
+ free_expression(function->expression);
+ free(function->name);
+ free(function);
+ }
+ }
+
+ if (module->handle.ast.functions)
+ free(module->handle.ast.functions);
+ }
+
+ free(module);
+ }
+
+ free(state.modules);
+
+ return state.program;
+}
projects / uwu-lang.git / blobdiff