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0.4.5

V 0.4.5

20 March 2024

Improvements in the language

• Add map update-init syntax: new_map := {...old_map, 'k1': 1, 'k2': 5} (#20561)
• Improve coroutines, Photon vcpu creation, coroutines + GC fixes (#20549)
• Update Boehm GC libs/headers to the latest version 8.3.0 (#20772)
• $dbg statement - native V debugger REPL (#20533)
• Implement @[_linker_section] attribute (#20629)
• Enable @[export] for global variables too (#20649)
• Add callstack support on v.debug (#20680)

Breaking changes

• sokol: the sokol wrapper was updated, to match its upstream version at commit 058a4c5, several of its APIs no longer exist
• templating.dtm: compile_template_file is no longer public
• v.trace_calls: pub fn on_c_main() {, is now pub fn on_c_main(should_trace_c_main bool) {
• v.transformer: Transformer.fn_decl is now Transformer.fn_decl_trace_calls
• x.vweb: Context.redirect(url string, redirect_type RedirectType) is now Context.redirect(url string, params RedirectParams)

Checker improvements/fixes

• Check invalid lambda expr (#20461)
• Fix comptime if with comptime smartcast (#20466)
• Fix anon struct init with const fields (fix #20452) (#20463)
• Disallow option or result return type, for infix operator overloading (#20494)
• Cleanup the const variable evaluate for fixed array fields of structs (#20503)
• Fix missing check for struct initialization with @[noinit] attribute, through using T{} (#20516)
• Fix mark methods into used-list, when generics as receivers (fix #20509) (#20527)
• Modify comments on generic receiver type storage (#20539)
• Fix checking give const map as default or init value to struct fields (fix #20512) (#20546)
• Fix return map index with or_block (#20544)
• Cleanup the generic tests (#20553)
• Fix @[deprecated] attribute for consts (fix #20523) (#20550)
• Cleanup in method_call() (#20554)
• Disallow non_opt_array << optvalue (#20573)
• Fix non dereferenced enum in match statements (fixes #10045) (#20591)
• Fix .variant smartcast on non-comptime variables (#20575)
• Disallow static maps: mut static x := map[string]int{} (#20596)
• Allow #define X and asm riscv64 {} blocks in .v files, with -freestanding (make embedded usecases easier)
• Add cast overflow checks (#20641)
• Disallow assigning none to _ (#20646)
• Fix checking for option matching with non-option (#20673)
• Disallow (x) := 10 (#20695)
• Disallow none as match cond (#20688)
• Fix comptime ident checking on defer stmt (fix #20719) (#20723)
• Add error for x as Y.field, suggesting using (x as Y).field instead for clarity (#20725)
• Disallow sum type holding alias ptrs (#20786)
• Optimise out calls to arg_typ_sym.embed_name() when there are no errors (#20820)
• Fix if branch option type mismatch (fix #20809) (#20830)
• Fix auto deref arg when fn expects ref (#20846)
• Fix struct field init with generic fn variable (fix #20847) (#20878)
• Cleanup in assign_stmt() (#20880)
• Check assigning immutable reference struct field (fix #20814) (#20883)
• Fix struct field init with generic anon fn (add the test from #18294) (#20888)
• Fix checking match branch call expr twice (#20910)
• Support Flags.bit ^ Flags.bit1 and ~Flags.bit (flagged enums) (fix #20925) (#20929)
• Fix some specific interface generic inference within generics struct and method (#20932)
• Remove notice when shifting signed int for @[translated] (#20935)
• Silence "assigning 0 to a reference field" and "uninitialized fn struct fields" notices for @[translated]\nmodule ... files (#20938)
• Fix missing check for interface cast of option type (#20961)
• Silence more warnings for @[translated] files (#20964)
• Fix comptimeselector passing to generic argument (#20985)
• Remove unnecessary string interpolation in deprecation method calls (#21007)
• Disallow void return value lambdas in array.map method calls (#21011)
• Cleanup and simplify check_ref_fields_initialized methods (#21016)
• Cleanup and simplify struct processing p1 (#21009)
• Add support for deprecation messages for structs and struct fields (#21017)
• Cleanup and simplify struct processing p2, extend test (#21025)
• Fix undefined reference to interface struct field regression (after #21025) (#21030)
• Add test for interface embedding and interface with erroneous implementation (test related to #21030) (#21033)
• Disallow Optional and Result high val in a for x in low..high { loop (#21043)
• Fix missing incompatible pushval type for chan <- operator (#21040)

Parser improvements

• Fix close_scope() missing, when field.name is sort or sorted (fix#20436) (#20485)
• Check non-generic interface defining generic method (#20545)
• vast,ast: output map init update expression (#20574)
• Implement MyEnum.from(1)! generic static method (#20411)
• Fix MyEnum.from(0)!, implement MyFlaggedEnum.zero() (#20623)
• vfmt,parser: keep the original import name in ast.Import, and use it without modifications for paths unders ~/.vmodules
• Allow double quotes in @include template directives (#20628)
• Fn type declaration does not check already registered name (#20732)
• Fix global const ordering with string inter literal (fix #20760) (#20770)
• Disallow option alias with option parent type (#20769)
• Make Scope.find methods more robust, when called on default initialised scope &Scope = unsafe { nil } fields (#20774)
• Fix parsing of cgen.v, in normal mode, when the table is empty (no files in builtin are preparsed) (fix #20606) (#20611)
• Fix infinite loop in Parser.sql stmt in -silent -print-watched-files mode (used by v watch) (#20873)
• Disallow defining map key more than once (#20905)
• Fix formatting comptime if expr, after inc expr (fix #20927) (#20931)
• Fix for comptime with fully type name (fix #20948) (#20988)
• Allow lock prefix instructions and numbered reg in inline asm blocks (#21022)
• Add better error for mut variadic fn argument (#21063)

Compiler internals

• v.util: make launch_tool failures more detailed (for the Text file busy; code: 26 case), bump tool_recompile_retry_max_count from 3 to 7
• v.util: make launch_tool more robust, when multiple v -b js file.v commands are run at the same time (all trying to recompile the JS backend program) (#20631)
• builder: allow for ./v -freestanding -cc riscv64-elf-gcc -d no_main -no-builtin -no-preludes -showcc -keepc x.v
• pref: support file_notd_freestanding.v + file_d_freestanding.v, remove dependency to os, of $embed_file(), when compiling with -freestanding (#20712)
• v.builder: reduce the default noise from successfully rebuilding cached thirdparty object files
• pref: allow fetching the photonwrapper .so (for the coroutines) with curl too, or print details for manual download (#20855)
• scanner: disallow a shebang line, that is not at the top of a file (#21029)
• strings.textscanner: fix off-by-one error in skip method (#21045)

Standard library

• x.crypto.chacha20: speed up the core functionality of the ChaCha20 stream cipher (#20470)
• log: enhance log time format setting (#20484)
• encoding.csv: add a new utility fn new_reader_from_file/2 (#20530)
• readline: add completion support (#20559)
• builtin: add is_hex(), is_int(), is_bin(), and is_oct() methods to the string type (#20540)
• builtin: add empty string verification for the new string .is_oct() etc methods, suggested on PR #20540 (#20564)
• json: fix struct with option enum field (fix #20597) #20597
• x.json2: fix panic on calling json2.decode of an optional enum (fix #20593) (#20603)
• vlib: add a compress.zstd module (#20616)
• io: ensure BufferedReader.read_line() returns io.Eof, instead of error('none') (#20619)
• log: add support for l.set_short_tag/1 (#20652)
• Update error checking for new error io.Eof (#20656)
• io: allow BufferedReader.read_line() to accept custom line delimiters (#20655)
• builtin: implement unbuffer_stdout/0 (#20662)
• x.crypto: add sm4 module (#20651)
• crypto.aes: optimise performance (#20674)
• os: add proper process termination with p.signal_term() (#20671)
• bitfield: enhance operation with multiple flags (#20683)
• os: fix File.read() in JS backends (fix #20501) (#20633)
• os: add error_posix() and error_win32() for explicit platform error handling and default behavior (#20694)
• log: implement set_always_flush/1 for log.Log, log.ThreadSafeLog and log.Logger (#20698)
• x.vweb: error() and simpler redirect(); comptime: a clearer error
• builtin: add a string.u8_array() method (#20736)
• os: add os.stat() and helpers (#20739)
• os: make os.SystemError struct public so the os.error_* functions can be used by other modules (#20754)
• os: refactor to use os.stat and os.lstat instead of unsafe C calls (#20759)
• os: make os_stat_test.v more robust to reporting false positives
• x.crypto: add poly1305 message authentication code (mac) in pure v (#20752)
• encoding.binary: add _fixed variants for the conversion fns, that accept fixed arrays (#20766)
• x.crypto.sm4: make sm4 use the encoding.binary _fixed fns (#20773)
• builtin: add gc_collect/0, gc_get_warn_proc/0, gc_set_warn_proc/1. Use them to turn off GC warnings by default. (#20788)
• builtin: support -d gc_warn_on_stderr, to show the GC warnings, without installing a custom warn fn callback
• x.crypto: add AEAD ChaCha20Poly1305 algorithm in pure v (#20817)
• x.crypto.chacha20: remove deprecated math.max_u32 in favour of builtin max_u32, remove unneceseary bits, reorder (#20838)
• json: fix decode struct ptr (#20828)
• time: add a .http_header_string() method on Time (#20861)
• json2: reorganize encode string (#20862)
• vlib: add encoding.txtar (port of Go's txtar module) (#20874)
• gg: handle dpi change, when moving window to another monitor (#20886)
• time: add a tm_gmtoff field to C.tm (a BSD and GNU extension) (#20907)
• x.json2: add skippable ...

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