Add `-internal-cached`

1 files changed, 213 insertions, 0 deletions

diff --git a/src/cached.cpp b/src/cached.cpp
new file mode 100644
index 000000000..89158ccbb
--- /dev/null
+++ b/src/cached.cpp
@@ -0,0 +1,213 @@
+gb_internal GB_COMPARE_PROC(cached_file_cmp) {
+	String const &x = *(String *)a;
+	String const &y = *(String *)b;
+	return string_compare(x, y);
+}
+
+
+u64 crc64_with_seed(void const *data, isize len, u64 seed) {
+	isize remaining;
+	u64 result = ~seed;
+	u8 const *c = cast(u8 const *)data;
+	for (remaining = len; remaining--; c++) {
+		result = (result >> 8) ^ (GB__CRC64_TABLE[(result ^ *c) & 0xff]);
+	}
+	return ~result;
+}
+
+bool check_if_exists_file_otherwise_create(String const &str) {
+	char const *str_c = alloc_cstring(permanent_allocator(), str);
+	if (!gb_file_exists(str_c)) {
+		gbFile f = {};
+		gb_file_create(&f, str_c);
+		gb_file_close(&f);
+		return true;
+	}
+	return false;
+}
+
+
+bool check_if_exists_directory_otherwise_create(String const &str) {
+#if defined(GB_SYSTEM_WINDOWS)
+	String16 wstr = string_to_string16(permanent_allocator(), str);
+	wchar_t *wstr_c = alloc_wstring(permanent_allocator(), wstr);
+	return CreateDirectoryW(wstr_c, nullptr);
+#else
+	char const *str_c = alloc_cstring(permanent_allocator(), str);
+	if (!gb_file_exists(str_c)) {
+		return false;
+	}
+	return false;
+#endif
+}
+bool try_copy_executable_cache_internal(bool to_cache) {
+	String exe_name = path_to_string(heap_allocator(), build_context.build_paths[BuildPath_Output]);
+	defer (gb_free(heap_allocator(), exe_name.text));
+
+	gbString cache_name = gb_string_make(heap_allocator(), "");
+	defer (gb_string_free(cache_name));
+
+	String cache_dir = build_context.build_cache_data.cache_dir;
+
+	cache_name = gb_string_append_length(cache_name, cache_dir.text, cache_dir.len);
+	cache_name = gb_string_appendc(cache_name, "/");
+
+	cache_name = gb_string_appendc(cache_name, "cached-exe");
+	if (selected_target_metrics) {
+		cache_name = gb_string_appendc(cache_name, "-");
+		cache_name = gb_string_append_length(cache_name, selected_target_metrics->name.text, selected_target_metrics->name.len);
+	}
+	cache_name = gb_string_appendc(cache_name, ".bin");
+
+	if (to_cache) {
+		return gb_file_copy(
+			alloc_cstring(temporary_allocator(), exe_name),
+			cache_name,
+			false
+		);
+	} else {
+		return gb_file_copy(
+			cache_name,
+			alloc_cstring(temporary_allocator(), exe_name),
+			false
+		);
+	}
+}
+
+
+
+bool try_copy_executable_to_cache(void) {
+	if (try_copy_executable_cache_internal(true)) {
+		build_context.build_cache_data.copy_already_done = true;
+		return true;
+	}
+	return false;
+}
+
+bool try_copy_executable_from_cache(void) {
+	if (try_copy_executable_cache_internal(false)) {
+		build_context.build_cache_data.copy_already_done = true;
+		return true;
+	}
+	return false;
+}
+
+
+
+
+// returns false if different, true if it is the same
+bool try_cached_build(Checker *c) {
+	Parser *p = c->parser;
+
+	auto files = array_make<String>(heap_allocator());
+	for (AstPackage *pkg : p->packages) {
+		for (AstFile *f : pkg->files) {
+			array_add(&files, f->fullpath);
+		}
+	}
+
+	for (auto const &entry : c->info.load_file_cache) {
+		auto *cache = entry.value;
+		if (!cache || !cache->exists) {
+			continue;
+		}
+		array_add(&files, cache->path);
+	}
+
+	array_sort(files, cached_file_cmp);
+
+	u64 crc = 0;
+	for (String const &path : files) {
+		crc = crc64_with_seed(path.text, path.len, crc);
+	}
+
+	String base_cache_dir = build_context.build_paths[BuildPath_Output].basename;
+	base_cache_dir = concatenate_strings(permanent_allocator(), base_cache_dir, str_lit("/.odin-cache"));
+	(void)check_if_exists_directory_otherwise_create(base_cache_dir);
+
+	gbString crc_str = gb_string_make_reserve(permanent_allocator(), 16);
+	crc_str = gb_string_append_fmt(crc_str, "%016llx", crc);
+	String cache_dir = concatenate3_strings(permanent_allocator(), base_cache_dir, str_lit("/"), make_string_c(crc_str));
+	String manifest_path = concatenate3_strings(permanent_allocator(), cache_dir, str_lit("/"), str_lit("odin.manifest"));
+
+	build_context.build_cache_data.cache_dir = cache_dir;
+	build_context.build_cache_data.manifest_path = manifest_path;
+
+	if (check_if_exists_directory_otherwise_create(cache_dir)) {
+		goto do_write_file;
+	}
+
+	if (check_if_exists_file_otherwise_create(manifest_path)) {
+		goto do_write_file;
+	} else {
+		// exists already
+		LoadedFile loaded_file = {};
+
+		LoadedFileError file_err = load_file_32(
+			alloc_cstring(temporary_allocator(), manifest_path),
+			&loaded_file,
+			false
+		);
+		if (file_err) {
+			return false;
+		}
+
+		String data = {cast(u8 *)loaded_file.data, loaded_file.size};
+		String_Iterator it = {data, 0};
+
+		isize file_count = 0;
+
+		for (; it.pos < data.len; file_count++) {
+			String line = string_split_iterator(&it, '\n');
+			if (line.len == 0) {
+				break;
+			}
+			isize sep = string_index_byte(line, ' ');
+			if (sep < 0) {
+				goto do_write_file;
+			}
+
+			String timestamp_str = substring(line, 0, sep);
+			String path_str = substring(line, sep+1, line.len);
+
+			timestamp_str = string_trim_whitespace(timestamp_str);
+			path_str = string_trim_whitespace(path_str);
+
+			if (files[file_count] != path_str) {
+				goto do_write_file;
+			}
+
+			u64 timestamp = exact_value_to_u64(exact_value_integer_from_string(timestamp_str));
+			gbFileTime last_write_time = gb_file_last_write_time(alloc_cstring(temporary_allocator(), path_str));
+			if (last_write_time != timestamp) {
+				goto do_write_file;
+			}
+		}
+
+		if (file_count != files.count) {
+			goto do_write_file;
+		}
+
+		goto try_copy_executable;
+	}
+
+do_write_file:;
+	{
+		char const *manifest_path_c = alloc_cstring(temporary_allocator(), manifest_path);
+		gb_file_remove(manifest_path_c);
+
+		gbFile f = {};
+		defer (gb_file_close(&f));
+		gb_file_open_mode(&f, gbFileMode_Write, manifest_path_c);
+
+		for (String const &path : files) {
+			gbFileTime ft = gb_file_last_write_time(alloc_cstring(temporary_allocator(), path));
+			gb_fprintf(&f, "%llu %.*s\n", cast(unsigned long long)ft, LIT(path));
+		}
+		return false;
+	}
+
+try_copy_executable:;
+	return try_copy_executable_from_cache();
+}
+