weekly.2024.52

releases: weekly.2024.52

0.4.9

22 Dec 2024

Improvements in the language

• -skip-unused is now on by default resulting in much smaller cgen and binaries. 70% reduction for hello world.
• -parallel-cc for speeding up -prod and -cc clang/gcc compilation by up to 14 times!
• C functions no longer need to be manually defined. An #include "foo.c" is enough (behind -experimental for now).
• Fixed arrays now have .index .any .all .map .sort .sorted methods
• Remove inline sum types completely
• Support in expr with number ranges: if var in 1..4 { (fix #20352) (#22754)
• Optimize literal string comparison (match, in and ==) (#22643)
• Allow map[k]()? and map[k]()() (#22740)
• Add selector option unwrapping inside if tree.root != none { (#22895)
• Add array.count as a method that accepts a predicate, similar to filter, but returning just the number of matches (#23054)
• Allow option array element comparison == and != (fix #23108) (#23113)

Breaking changes

• time: rewrite parse_rfc3339/1 to improve performance, reject partial timestamps, that miss date info like 22:47:08Z (#22585)

Checker improvements/fixes

• Optimize identical type checking (#22596)
• Fix T.unaliased_typ if branch evaluation (fix #22587) (#22598)
• Fix lambda expr with fntype params and restore fixed_array_any_all_test.v (#22625)
• Check fixed array builtin method args mismatch (#22626)
• Fix generic fn call return type resolve on var assignment (fix #22612) (#22627)
• Improve checking parameter mismatches for fixed array builtin methods (#22630)
• Add tests for checking the new errors for fixed arrays .sort() calls (#22656)
• Fix index expr that left is if expr (fix #22654) (#22661)
• Fix return type checks, when returning struct values, implementing IError in non-result fn (fix #22659) (fix #22658) (#22660)
• App.method field initialisation, for fn fields, initialised with generic methods (#22665)
• Allow for f() or { T{} } in a generic method, for fn f() ?T {, being called with T, being a container like []int etc, not just a primitive type like int (#22672)
• Allow for f() or { T{} } part 2, see also cc55aa5 (handle the case of an ignored result as well) (#22687)
• Fix selector with prefixed & structinit (#22689)
• Fix missing check for fn var with generic return inherited to anon fn (fix #19045) (#22683)
• Check for receiver name clashing with global var (fix #22698) (#22708)
• Fix none check for match expr with option (fix #22728) (#22732)
• Fix option map fn type and missing check for result param type (fix #22736) (#22738)
• Fix missing info about generic fn var usage without concrete types (fix #22733, #22734) (#22743)
• Fix missing check for stack pointer return (fix #22726) (#22756)
• Improve static method call resolution (fix #22773) (#22787)
• Skip redundant message for int overflows, while casting integer literals (fix #22761) (#22788)
• Fix callexpr after auto C func identification (fix #22800) (#22809)
• Fix missing auto from_string type restriction (related to #22783) (#22803)
• Fix match expr with empty array init expression (#22832)
• Disallow foo[T] as a value (#22820)
• Fix if expr with empty array init expression (related #22832) (#22841)
• Improve the position underlining, for last statements in branches of if expressions (#22845)
• Fix generic fn call with empty array argument (fix #22843) (#22846)
• Fix missing or-block check for callexpr (fix #22835) (#22840)
• Check array builtin method calls, that do need a mutable receiver, but are called on an immutable one (fix #22850) (#22853)
• Check alias of array op overloading and fix op overloading (fix #22851) (#22854)
• Disallow struct init with mutable_field: const_array (fix #22862) (#22863)
• Check struct aliased field unsign type assigning negative value (fix #22868) (#22871)
• Fix alias to struct generic type (fix #22866) (#22872)
• Fix json.encode_pretty with a struct init expression argument (#22897)
• Fix codegen for fixed array initialization with a fn call (fix #22887) (#22891)
• Fix or-expr check on invalid method call (fix #22949) (#22950)
• Fix mut var option unwrap with != none, support if mut x != none { too (fix #22936) (#22943)
• Prevent a compiler panic, while running v -check file.v on files with parser errors (fix #22981) (#22982)
• Allow array sort with callexpr (#22989)
• Fix $res() used in defer {} blocks with more statements, add a test (#22998)
• Fix generec fn returning generic closure (#23047)
• Fix generic fn returning generic closure (related #23047) (#23055)
• Fix missing checker for cast from mut var to non-ptr type (fix #23017) (#23056)
• Check fn call argument mismatch (fix #23016) (#23061)
• Fix empty array append multi dims (fix #23092) (#23096)
• Fix selector generic or block (fix #23088) (#23102)
• Fix veb route method param with non ctx name (fix #23105) (#23107)
• Allow fixed array where voidptr is expected (fix #23090) (#23100)
• Fix immutable to mutable reference (fix #22653) (#22663)
• Fix missing check on range expr when high var is same iteration value var (#23130)
• Allow []Enum{len: 10, init: .thing} (fix #23077) (#23165)
• Fix option unwrapping and call from option struct field (#23182)
• Add a notice for global variable redeclarations (#23162)
• Fix assign check, when rechecking for another concrete type (#23212)

Parser improvements

• Fix generic struct init detection T{} (#22682)
• Improve the assert informations (related #22668) (#22679)
• Make C struct fields public and mutable by default (fix #22695) (#22706)
• Fix enum redeclaration error (fix #22759) (#22766)
• Fix struct field name using keyword (fix #22826) (#22829)
• Optimise mark_var_as_used calls, by moving it to an ast.Scope method (#22842)
• Optimize method parameter detection in used check (#22915)
• Fix block position's last line (#22913)
• Support @[must_use] tag for fns/methods, and an experimental -check-result option (#22983)
• Allow type as field type on params struct construction (fix #23091) (#23098)
• Allow type and other keywords as plain attr value (fix #23150) (#23154)
• Support @[tag] for hash statements, like #define and #flag (#23210)

Compiler internals

• Add :parse_text to the paths of .v files, printed by -print-v-files, for parse time generated snippets
• v.pref: support a _wasm32_emscripten.c.v suffix for platform files too
• builder: fix msvc build thirdparty obj file from .cpp (fix #22772) (#22789)
• v.util: use temporary workaround for the vinix build problem (when VFLAGS is set, and -ldflags is passed at the same time)
• Allow getting notified about unused function params (#22879)
• v.scanner: remove Scanner.is_started field (#22918)
• v.scanner: fix string interpolation for float e format (fix #22429) (#23147)
• cbuilder: remove flto with parallel-cc, it slowed down linking 10x
• cbuilder: store split up C files in vtmp
• v.builder: integrate more compile/linker options into parallel_cc.v (#23190)
• v.builder: prevent passing -x objective-c with -parallel-cc for now
• v.builder: move filtering logic for -parallel-cc to parallel_cc.v
• v.pref: support -debug and -cdebug, as more explicit alternative names for -g and -cg (#23208)
• v.builder: fail the whole v compilation, if linking or compiling during -parallel-cc fails (#23211)
• v.pref: implement -no-prod-options to turn off passing -O3 -flto, while still keeping the $if prod { branches (passing custom flags with -cflags -Os already works)
• v.builder: support -no-prod-options with -cc msvc as well

Standard library

• builtin: improve performance of string.starts_with/1 and string.ends_with/1, when compiled with tcc (#22620)
• builtin: improve fixed_array_any_all_test.v (related #22609) (#22621)
• builtin: temporary fix fixed_array_any_all_test.v (#22624)
• builtin: support -d no_gc_threads for turning off passing -DGC_THREADS=1 while compiling the GC library
• encoding.utf8: fix is_punct func (fix #22646) (#22647)
• log,time: improve performance for writing a line to a log, add Time.format_rfc3339_micro/0 (#22662)
• flag: add missing short flag match in flag.to_struct, add test (#22696)
• bitfield: add shift_left/1 and shift_right/1 methods to BitField (#22700)
• x.json2: pre-arranging the replacement of the decoder, to match https://github.com/enghitalo/v/tree/decoder2_to_json2 (#22729)
• builtin: improve fixed_array_any_all_test.v (#22746)
• builtin: add string.is_pure_ascii() (#22748)
• os: document the various enum values in os.Signal (#22770)
• builtin: fix runes.to_upper() (fix #22742) (#22755)
• ci: use os.system to redirect output
• builtin: minor optimization in rune.map_to() (#22810)
• vlib: initial addition of x.encoding.asn1 (#22783)
• os: work towards being able to again use -autofree while recompiling the V compiler several times
• x.encoding.asn1: fix time creation to also accommodate negative timezone offsets (#22861)
• vlib: remove modules/functions/fields, deprecated in 2023 (#22750)
• term: improve performance of repeated can_show_color_on_stdout and can_show_color_on_stderr calls, by caching their results (#22893)
• builtin: make int_min/2 and int_max/2 public
• json: mark json_print_pretty/1 with @[markused] (used by cgen)
• math.big: use @[manualfree] to workaround -autofree compilation issues with gitly, and other projects using crypto.rand and math.big
• x.encoding.asn1: improve performance (#22948)
• gg: use a larger fontstash text atlas by default (2048x2048, and customizable), instead of 512x512 (fix #21610) (#22959)
• Revert "os: deprecate os.getwd in favor of os.get_current_dir (part 1) (#22966)"
• log: tag log.fatal with @[noreturn] (#22986)
• runtime: force runtime.nr_jobs() to return 1, while V is bootstrapping itself, from vc/ source, that was compiled with ...

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