initial commit

+ Lots of code copied from ek, so didn't have to start from scratch, but
  might mean there are some quirks here and there that made sense in ek
  but not necessarily here.

1 files changed, 138 insertions, 0 deletions

diff --git a/src/compiler.c b/src/compiler.c
new file mode 100644
index 0000000..d18e767
--- /dev/null
+++ b/src/compiler.c
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: copyleft-next-0.3.1 */
+/* Copyright 2024 Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
+
+/**
+ * @file compiler.c
+ *
+ * Top level compiler implementation.
+ */
+
+#include <stdbool.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+
+#include <fwd/compiler.h>
+#include <fwd/analyze.h>
+#include <fwd/parser.h>
+#include <fwd/debug.h>
+#include <fwd/scope.h>
+#include <fwd/lower.h>
+
+/**
+ * Read whole file into a buffer and return pointer to buffer.
+ * Possibly kind of silly to have both \p file and \p f.
+ * Apparently there's no standardized way to get the file name of a
+ * file pointer.
+ *
+ * @param file Name of file to read.
+ * @param f File pointer.
+ * @return Pointer to buffer with file contents.
+ */
+static char *read_file(const char *file, FILE *f)
+{
+	fseek(f, 0, SEEK_END);
+	/** @todo check how well standardized this actually is */
+	long s = ftell(f);
+	if (s == LONG_MAX) {
+		error("%s might be a directory", file);
+		return NULL;
+	}
+
+	fseek(f, 0, SEEK_SET);
+
+	char *buf = malloc((size_t)(s + 1));
+	if (!buf)
+		return NULL;
+
+	fread(buf, (size_t)(s + 1), 1, f);
+	/* remember terminating null */
+	buf[s] = 0;
+	return buf;
+}
+
+/**
+ * Helper for process_file(), actually processes the file
+ * after process_file() has done path lookups and working directory
+ * changes and whatnot.
+ *
+ * @param parent Parent file context. \c NULL if root file.
+ * @param public \c 1 if file is being imported publicly, \c 0 otherwise.
+ * @param file File name to process.
+ * @return \c 0 if processing was succesful, non-zero value otherwise.
+ */
+static int process(struct scope **parent, const char *file)
+{
+	FILE *f = fopen(file, "rb");
+	if (!f) {
+		error("failed opening %s: %s\n", file, strerror(errno));
+		return -1;
+	}
+
+	const char *buf = read_file(file, f);
+	fclose(f);
+
+	if (!buf)
+		return -1;
+
+	struct parser *p = create_parser();
+	if (!p) {
+		free((void *)buf);
+		return -1;
+	}
+
+	parse(p, file, buf);
+	struct ast *tree = p->tree;
+	bool failed = p->failed;
+	destroy_parser(p);
+
+	if (failed) {
+		free((void*)buf);
+		return -1;
+	}
+
+	ast_dump_list(0, tree);
+
+	struct scope *scope = create_scope();
+	if (!scope) {
+		free((void *)buf);
+		return -1;
+	}
+
+	scope->fctx.fbuf = buf;
+	scope->fctx.fname = strdup(file);
+	if (*parent)
+		scope_add_scope(*parent, scope);
+	else
+		*parent = scope;
+
+	if (analyze_root(scope, tree))
+		return -1;
+
+	return 0;
+}
+
+int compile(const char *input) {
+	int ret = -1;
+	struct scope *root = NULL;
+	if (process(&root, input)) {
+		destroy_scope(root);
+		destroy_allocs();
+		error("processing of %s stopped due to errors", input);
+		return ret;
+	}
+
+	if ((ret = lower(root))) {
+		destroy_scope(root);
+		destroy_allocs();
+		error("lowering of %s stopped due to errors", input);
+		return ret;
+	}
+
+	destroy_scope(root);
+	destroy_allocs();
+	return 0;
+}