The unary .not arm emitted bool_not (LLVM bitwise Not) for every
operand. Correct on i1; on an error binding — an error-set value, u32
tag at the LLVM level — a bitwise not of a nonzero tag stays nonzero,
so 'if !e' held even on a SET error and its branch read the
uninitialized success value (real segfault in the distribution repo's
sqlite tests). Plain integers had the same hole ('!7' was '~7').
Now: bool keeps bool_not; integers and error-set operands lower as the
truthiness complement (cmp_eq against a typed zero); anything else is
diagnosed instead of silently bit-flipped.
Regression: examples/1057 (set error: !e must not hold; success: !e
holds with a real value; integer truthiness) + examples/1171 (!"text"
diagnosed); both FAIL pre-fix. zig build test 426/426;
tests/run_examples.sh 600/600.
lowerEnumLiteral resolved the variant against the raw destination type,
so any non-enum destination fell into resolveVariantValue's silent
return-0 tail with the enum_init stamped as the wrong type:
- ?E destinations produced variant 0 mis-typed as the optional
(observed as variant 0 OR null, layout-dependent);
- builtin destinations (i64) silently became 0;
- unknown variants of real enums silently became variant 0;
- a destination-less literal panicked LLVM emission (unresolved
type reached codegen).
Now: optional destinations unwrap to the child enum (the coercion
layer's .optional_wrap handles E -> ?E), and the remaining shapes are
diagnosed — unknown variant (with the variant list, via the new
emitBadEnumVariant twin of emitBadVariant), non-enum destination, and
no destination (cascade-guarded: silent when the destination's type
already failed to resolve and was reported).
Regression tests: examples/0183 (return/assign/reassign into ?Enum,
non-zero variants, null path) + examples/1169/1170 (each diagnostic);
all three FAIL on pre-fix master. zig build test 426/426;
tests/run_examples.sh 598/598.
Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.
Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).
Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.
zig build test: 426/426; examples suite: 595/595.
The plan producer's namespace-fn arms returned the declared return type
without checking type_params, so a qualified generic call's result
carried the unbound T stub: print boxed it as 'T{}', and a non-s64
binding failed LLVM verification (pack monomorphized for the stub,
call returning double). Both fn_ast_map-backed arms now classify
generic callees as generic_fn and infer the return through
inferGenericReturnType, mirroring the bare-identifier path.
extractTypeParam's slice arm only extracted from slice-typed args, so
first(a) with a : [3]s64 at first :: (xs: []$T) -> T left T unbound
and the mono body reached LLVM emission carrying the .unresolved
sentinel (panic). The arm now also extracts from array args via the
array's element type — mirroring the array→slice promotion concrete
slice params already perform; the existing arg coercion handles the
rest.
lowerGenericCall additionally diagnoses any still-uninferrable TYPE
param at the call site instead of monomorphizing unbound — the
deliberate string-at-[]$T gap used to hit the same sentinel panic and
now errors with a source-located message. Comptime value params
($N: u32) and ..$Ts packs bind through their own dispatch and stay
exempt.
Regressions: examples/0212-generics-array-arg-slice-param.sx (scalar /
u8 / struct elements + the slice spelling) and
examples/1168-diagnostics-generic-param-uninferrable.sx (string arg
diagnostic) — both failed pre-fix.
Two lowering sites materialized a local array as a whole LLVM value;
the legalizer scalarizes each such op into one SelectionDAG node per
element, and at ~64K elements the DAG combiner segfaults
(DAGCombiner::visitMERGE_VALUES → ReplaceAllUsesWith).
- lowerVarDecl: an array-typed `---` initializer emits NO store — the
slot stays uninitialized instead of receiving a whole-array undef
store. The tuple zero-init carve-out stays; non-array `---` keeps
the undef store. The interp is unchanged either way (slots start
.undef).
- lowerIndexExpr: element reads on an array with addressable storage
GEP the storage and load one element — the general-expression
sibling of 0110's lowerFor fix — without value-lowering the object
(a dead whole-array load would still reach the DAG). Storage-less
arrays keep the index_get fallback.
Sibling shape filed as 0125: any_to_string's per-array-type arms still
pass the array by value, so a 64K+ array type + any {} print crashes.
Regression: examples/0055-basic-large-stack-array.sx (sx build
segfaulted pre-fix). 22 .ir snapshots re-pinned: removed undef stores
and ig.tmp spills, in-place gep+load (instruction-shape-only churn,
reviewed).
The two not-yet-lowered fn_ast_map paths in resolveCallParamTypes (the
qualified `ns.f(...)` call and the plain free-fn call) resolved each
param type in the CALL SITE's visibility context, so a namespaced
import's param type that is bare-visible only in its own module
diagnosed "type 'X' is not visible" at calls whose caller never names
the type bare. Route both through the E4 source pin
(resolveParamTypeInSource), as the method paths already do.
A generic callee's bare T leaves are not nominal names in that module:
astCalleeParamTypes installs the call's inferred $T -> concrete
bindings (the one binding builder) before resolving, or the pin turns
the unbound leaf into "unknown type 'T'" (regressed examples/0129
through math/scalar.sx's clamp).
Regression: examples/0840 (namespaced fn with a module-bare param
type; failed "not visible" pre-pin).
checkCallArity compares the supplied count against the declared params
(min = params without trailing defaults, max = params.len, unbounded
past a variadic) at the five plain dispatch sites in lowerCall — bare
selected-author + lazy, namespace alias-gate + qualified, struct
method, ufcs. Pack / comptime / generic / #compiler / #builtin callees
keep their own dispatch. The method/ufcs sites also gain the
appendDefaultArgs fill the generic-instance leg already had, so
trailing defaults work on dot-calls instead of emitting under-arity
calls. lowerStmt's local fn_decl arm now registers a pointer into the
AST node in fn_ast_map, not a stack temporary that aliased every later
local fn.
The flat #import of mem.sx predated the namespace tail — the tail's
mem :: #import already puts mem.sx in the program graph, which is all
the ufcs helpers (context.allocator.create/alloc/free/clone) and the
CAllocator default-context machinery need; std.sx itself references no
mem name. Probe-verified the full mem surface + all gates: suite
588/588, zig build test 0, m3te 23/23, game builds + bundles. The
double import was also duplicating lowered IR — the 37 re-pinned .ir
snapshots net ~2.5k lines smaller; output streams byte-identical.
std.sx now contains only alias declarations (the re-export mechanism:
own decls carry one flat-import level) over three part-files: core.sx
(builtins, libc escape hatch, Source_Location/Allocator/Context/Into,
the reserved `string` decl — which needs and permits no alias), fmt.sx
(print/format/any_to_string/string ops/cstring/alloc_slice), list.sx
(List). The namespace tail is unchanged; the part-file namespaces
(core/fmt/list) carry alongside it. Consumer surface is byte-identical
— every bare prelude name resolves through the aliases (0120/0121
machinery). 37 .ir snapshots re-pinned: pure string-constant
renumbering from the changed import graph (digit-normalized diff is
empty). Gates: zig build test 426/426, suite 588/588, m3te 23/23,
game SxChess builds + bundles.
Renamed fn aliases failed for EVERY kind (the filed pack-only scope was
a same-name confound: same-name re-exports already resolved through the
name-keyed fn_ast_map). scanDecls now follows ident-/ns.X-RHS const
alias chains (aliasedFnDecl; 0120's hop walk extracted as
followAliasChain) and registers the alias name in fn_ast_map
(absent-only), so every dispatch path — early pack/comptime/generic,
plain lazy-lower, plan-side typing — sees the target decl unchanged.
my_print :: s.print; / my_format :: s.format; now work (the std.sx
re-export shape). Regression: examples/0546 (+rich). Gates: zig build
test 0, suite 588/588.
BoxAlias :: Box; / Box :: r.Box; now resolve instantiation, methods,
annotations, and chains through the aliased template, and re-export one
flat-import level as ordinary own decls (the facade shape the std.sx
restructure needs). selectGenericStructHead consults aliasedStructTemplate
(nominal.zig) before the global template map — own-wins/single-flat alias
author, each hop pinned to the alias author's source, ns.X RHS through
namespaceAliasVerdictFrom, depth-capped. resolveTypeCallWithBindings'
silent .unresolved tail (panicked in LLVM emission) now diagnoses
"unknown type". Also aligns the stale pre-existing calls.test.zig UFCS
plan test with the opt-in model (a47ea14). Regression: examples/0211
(+rich/+facade). Gates: zig build test 426/426, suite 587/587.
A struct constant whose every field serializes — literals, enum tags,
nested aggregates, and (new) const EXPRESSIONS over named consts /
const-aggregate leaves ('r = K + 1', 'g = LIT.r', 'b = A[1]') — becomes
an immutable global: one storage, reads load/GEP it, '@LIT' is
addressable, dead-global elimination drops unused ones. constExprValue
gained a fold-through tail (evalConstIntExpr/evalConstFloatExpr,
source-aware), which also enables const-expression ELEMENTS in array
consts.
A const with a NON-serializable field (a call, a runtime read) keeps
inline re-lowering, and that per-use evaluation is now the documented
contract for the class (pinned: 'CALL.r' reads 1 then 2, side effects
run per use; '#run' is the evaluate-once tool).
Examples: 0180 (migrated shapes + @ptr + copy independence),
0181 (the inline-fallback contract). m3te (23/23) + game rebuilt green.
An array const's '.len' and 'K[<const idx>]' element reads, and a
struct const's field ('LIT.r'), fold as compile-time integer leaves —
usable in array dimensions and other constants' initializers. All
source-aware (the SELECTED author's elements, folded in the author's
context with the cyclic-definition frame); a const out-of-range index
diagnoses at fold time, never wraps.
- evalConstIntExpr gains the three ctx hooks (lookupConstAggLen /
lookupConstArrayElem / lookupConstStructField) + an index_expr arm;
all five ctx implementations extended (stateless tiers fold null).
- Array consts dual-register in module_const_map (value = the literal
node) so the folders see elements; bare reads still hit the GLOBAL
arm first, so no double emission.
- Untyped consts whose RHS is a const-aggregate leaf ('L :: K.len',
'E :: K[1]', 'R :: LIT.r') register in a pass 2b AFTER aggregates,
gated on the receiver naming a const aggregate — a namespaced member
('F :: m.PI_ISH') is never mis-typed by the count placeholder.
Examples: 0179 (folds in dims + const exprs), 1163 (OOB diagnostic).
Any assignment / compound-assignment whose target chain is ROOTED at a
constant — a const-flagged global (array consts, #run consts) or a
module value const (struct consts incl.) — diagnoses 'cannot assign
through constant X' at compile time. A struct const's field write used
to compile and bus-error at runtime (issue 0116); scalars misfired
silently. A deref along the chain (p.*) breaks the root — pointer
writes stay the documented escape until the const-ness steps; a local
shadowing the const name stays writable.
Also: typed struct constants ('W : Color : Color.{...}') register —
the shape list skipped struct_literal, leaving the typed form
unresolved while the untyped one worked.
Examples: 1162 (all rejection shapes incl. the 0116 crash repro),
0178 (typed struct const reads + copy independence).
K : [4]s64 : .[...] and the untyped A :: .[1, 2, 3] register as
is_const globals: one storage, reads GEP it, dead-global elimination
drops unused ones, source-aware reads come free via selectGlobalAuthor.
- registerConstArrayGlobal (scanDecls pass 2): typed via the annotation
(array-ness + dimension/count checked), untyped via element-type
unification — all ints s64; ANY float promotes the element type to
f64 with ints converting exactly; bool/string homogeneous; a
non-numeric mix or non-inferable element asks for an annotation.
- constExprValue converts int elements into float destinations exactly
(the int+float promotion rule, element-wise).
- emitGlobals marks is_const globals LLVMSetGlobalConstant — also flips
the comptime-backed #run globals and __sx_default_context to
'constant' (37 pinned IR snapshots regenerated; runtime unchanged).
- Element shapes: nested arrays, struct elements, strings, bools.
Non-constant elements / dim mismatch / mixed types diagnose loudly.
Examples: 0177 (feature matrix incl. @K reads through *[4]s64 — needs
the 0117 fix), 1159/1160/1161 (diagnostics), 0837 repointed to values.
A '*[N]T' receiver in an index expression reached LLVM emission with an
unresolved element type and tripped the panic sentinel — no read or
write spelling worked. ptrToArrayElem on Lowering recognises the shape;
the index READ path GEPs the pointee array through the pointer value
and loads the element; the write / compound-assign / lvalue /
addr-of-element paths and the expression typer resolve the element type
through the same helper (their GEP machinery already handled a pointer
base). Kept out of getElementType so slice paths don't half-accept a
raw pointer base.
Regression: examples/0176 (read, write, compound, element ptr + deref).
ShaderHandle lives in modules/gpu/types.sx; bare-type visibility is
non-transitive (0763), so the example imports it directly. Builds for
ios-sim again.
With 0115's own-wins globals landed, the remaining tail modules join
std.sx: every '#import "modules/std.sx"' now carries mem/xml/log/fs/
process/socket/json/cli/hash/test as namespaces (trace stays a direct
import).
Enablers in the same change:
- emit: dead-global elimination — a plain-data global no instruction
references is not emitted, so tail modules' data (hash's 64-entry K
table, OS/ARCH/POINTER_SIZE) stays out of binaries that don't use it.
Comptime-backed globals keep their #run evaluation. 37 pinned IR
snapshots regenerated (dead globals dropped + string renumbering from
the larger module).
- 1055/1056 stop pinning the global error-tag ordinal (it shifts with
program composition); they assert nonzero + tag identity + name.
- specs/readme/CLAUDE.md tail docs updated.
The globals registry (global_names) was last-wins across modules with no
per-importer gate: any module's bare K could read/write/type against an
unrelated module's same-named global (hash.sx's K table hijacked every
user K once std's namespace tail pulled hash into the program), and an
own const of an unsupported shape borrowed another module's const and
panicked at the unresolved-type tripwire.
- var_decl joins RawDeclRef: module globals are selectable raw authors.
- selectGlobalAuthor (the globals analogue of F2's selectModuleConst):
own author wins, one flat-visible author resolves, >=2 distinct flat
authors diagnose loudly, authored-but-not-visible diagnoses, and a
compiler-synthesized global (no raw author) emits untracked. A var_decl
author whose per-source registration was deduped at flat-merge (two
modules declaring the same extern symbol) serves the symbol's
registration.
- All bare-identifier global sites route through it: value read, addr-of,
assignment (store + compound), lvalue address, fn-ptr call, call param
typing, and expression type inference.
- selectModuleConst gains .own_opaque: an own const author with no
materialized per-source value (e.g. an array '::' const) blocks
borrowing another module's same-named const — the read diagnoses
cleanly instead of panicking.
- The fn-as-VALUE arm admits raw-facts-only authors: an own fn whose name
a flat-merge collision dropped from the global decl list (first-wins)
now resolves via author selection for func_ref/closure/Any shapes too.
Regressions: examples 0835 (own const vs flat array global), 0836 (main
const vs namespaced array global, incl. inference), 0837 (own array
const never borrows cross-module — clean unresolved).
The lowerCall namespace branch routed alias.fn() through the global
qualified registration (first-wins) at any import depth, and through the
global last-wins bare map for comptime/generic members. Plain-identifier
alias roots now resolve via the carry-aware namespaceAliasVerdict:
- visible alias (own edge or ONE flat hop): the member dispatches the
TARGET module's own fn (namespaceFnMember + fd-keyed bareAuthorFuncId),
so two modules' same-named aliases each call their own target.
- two direct flat imports carrying the alias to distinct targets:
loud ambiguity diagnostic.
- alias only reachable beyond one hop: "namespace 'X' is not visible".
- foreign / builtin / #compiler members keep the literal-symbol path.
Regressions: examples 0832 (two-hop), 0833 (carried collision),
0834 (own-target pin / first-wins repair).
An extensionless import path that names a directory next to a same-named
.sx file ('modules/std' with both modules/std.sx and modules/std/ present)
no longer silently resolves to the directory — it errors and asks for the
explicit .sx spelling. Exemption: a file importing its own companion
directory (X.sx importing X/, the multi-file test layout) stays legal —
the sibling file is the importer itself, so the directory is the only
sensible target.
- objc.sx, objc_block.sx (from std/) + sdl3/opengl/raylib/stb/stb_truetype/
wasm vendor bindings (from modules/ root) -> modules/ffi/
- std/uikit.sx deleted: platform/uikit.sx already declares UIApplicationMain
and imports objc; '#framework "UIKit"' cannot live in a file imported on
macOS targets (unconditional link directive, UIKit is iOS-only), so the
three iOS-only examples carry the 3-line glue inline. 1607/1608/1616 also
un-rotted (dead ns_string -> 'xx "..."' Into conversions, callconv(.c)
msgSend fn-ptrs) — all three build for ios-sim/ios again.
- math/math.sx -> math/scalar.sx; one spelling '#import "modules/math"'
everywhere (4 pinned IR snapshots regenerated: dir import adds Vec2/Mat4
to the type tables).
- compiler.sx -> build.sx (imports, CLAUDE.md bundling table, specs.md).
- testpkg/ + test_c.sx -> tests/fixtures/ (resolve CWD-relative from repo
root, same as vendors/).
- library-internal imports use full modules/... paths (std.sx tail,
platform/bundle.sx, fixtures).
allocators/fs/process/socket/log/trace/test move under modules/std/
(allocators.sx becomes std/mem.sx; the Allocator protocol moves into
the std.sx prelude, impls stay in mem.sx). New std/xml.sx holds
xml_escape as xml.escape. std.sx gains the carried namespace tail —
flat-importing std.sx now also provides mem./xml./log. — with the
remaining modules (fs/process/socket/json/cli/hash/test) deferred from
the tail until the global last-wins maps are fully own-wins (pulling
them into every closure collides bare names corpus-wide; they stay
direct imports: modules/std/fs.sx etc.). log.sx's internal emit
renamed log_emit (it clobbered consumer fns named emit program-wide).
bundle.sx uses xml.escape via the carried alias. Consumer import paths
swept mechanically; .ir snapshots recaptured for the larger std
closure. m3te + game build unchanged.
Two coupled capabilities on the road to the std restructure
(current/PLAN-STDLIB.md, issue 0114):
1. alias.Type.method() / alias.Type as a call head, alias.CONST, and
alias.Enum.variant now resolve — previously only alias.fn() and
type-position alias.Type worked. objectIsValue treats an
alias-rooted field_access as a type head; the call path strips the
alias to the existing Type.method machinery; lowerFieldAccess
resolves alias.CONST pinned to the target module and alias.Enum.x
as a typed enum literal; resolveTypeWithBindings resolves qualified
type_exprs pinned to the target.
2. The carry rule: namespaceAliasTarget resolves an alias from the
file's own edges first, then from DIRECT flat imports (one level),
diagnosing two distinct carried targets as ambiguous. All qualified
shapes work through a carried alias — the std.sx namespace tail
(mem.GPA.init() etc.) is now expressible.
Regression: examples/0831-modules-namespace-alias-carry.sx (direct +
carried, all seven shapes).
try foo() catch (e) { } // legal
try foo() catch e { } // parse error with a migration hint
Same capture style as the for-loop. All four catch shapes keep working
with the parenthesized binding — block, bare-expression body, and the
== match sugar — and the no-binding forms are unchanged. onfail follows
the same rule (onfail (e) { }); its expression-cleanup form is
disambiguated by the paren-group-before-brace lookahead, so
onfail (f()); stays an expression cleanup.
AST unchanged; the printer renders the parens; the #run escape help
text updated. Corpus migrated (57 catch + 3 onfail bindings, in-source
parser test strings, specs incl. grammar rules, readme untouched —
no catch examples there).
Regression: examples/1157-diagnostics-catch-binding-needs-parens.sx;
re-captured stderr for 1010/1013/1037/1123 (migrated source echoed in
carets + help text).
globalInitValue had no unary_op arm, so g : s64 = -1; fell into the
catch-all 'must be initialized by a compile-time constant' even though
constExprValue already folds negate(literal) for the module-const
identifier route. The new arm routes through constExprValue and applies
the direct-literal rules to the folded value: checkIntLiteralFits on
ints (g : s8 = -300 gets the range diagnostic), and a negated float at
an integer global narrows only when integral (-4.0 folds to -4, -4.5
errors). Binary-op initializers keep the specific non-constant
diagnostic.
Regression: examples/0175-types-negative-literal-global.sx.
checkIntLiteralFits range-checks a literal against its integer target
(builtins + custom widths via intLiteralRange; width-64 types skip —
every representable literal is a legal bit pattern there) and diagnoses
with the type's range and an xx/cast hint. Wired into the .int_literal
arm (covers decls, assignments, call args, struct-literal fields),
lowerStructConstant, and globalInitValue.
A negated literal now folds to a single constant so -128 range-checks
as -128 rather than as an out-of-range +128 intermediate. An explicit
xx operand skips the check — truncation stays available on request
(cast(T) was already exempt: its value arg lowers without the target).
examples/0300-closures-lambda.sx pinned 133 wrapping to -3 through an
s3 param — the exact class this outlaws; updated to a fitting value.
Found during the fix and filed separately: issue 0113 (negated-literal
global initializers rejected as non-constant; pre-existing).
Regressions: examples/1156-diagnostics-int-literal-out-of-range.sx,
examples/0174-types-int-literal-boundaries.sx.
xs[1..=3] (end inclusive), xs[0<..<4] (both exclusive), xs[..=2]
(prefix form with markers, implicit 0 start), xs[2<..] (open end,
exclusive start), and xs[..] (whole collection) — lowered as lo+1 /
hi+1 on the existing subslice op. Strings slice through the same path.
An explicit end marker requires an end expression, matching the
for-header rule.
Regression: examples/0052-basic-slice-range-bounds.sx.
x+2..=42 (expression start, 39 iterations summing 897),
x+2<..<x*21 (expressions both ends, 5..41), 0..x*3 (expression end).
Expression parsing stops at the range lexeme from either side, so any
expression works in either position — now pinned.
Each side of '..' takes an optional bound marker, defaulting to
start-inclusive, end-exclusive (a..b == a=..<b; a..=b stays the short
end-inclusive spelling):
for 0<..<N (i) { } // 1 .. N-1 (both exclusive)
for 0=..=N (i) { } // 0 .. N (both inclusive)
for 0<..=N (i) { } // 1 .. N
for 0..<N (i) { } // 0 .. N-1 (explicit default)
for xs, 2<.. (x, i) // open range, exclusive start: i = 3, 4, ...
The nine lexemes are single tokens (maximal munch on '<'/'='/'..'), so
expression parsing never sees the leading marker as a comparison; '<',
'<<', '<=', '==', '=>' lex unchanged. An explicit end marker makes the
end expression mandatory; open forms are a.. / a<.. / a=... Works in
runtime, multi-iterable, and inline-for headers.
Regression: examples/0051-basic-for-range-bounds.sx (full matrix, open
start-marked ranges, comptime unroll, runtime bounds, lexer
non-regression); 1152's pinned message generalized.
The for header is now a comma-separated list of iterables with a
positional capture group and no ':' separator:
for xs (x) { } // collection
for 0..n (i) { } // range (end exclusive)
for 1..=5 (a) { } // ..= inclusive end
for xs, 0.. (x, i) { } // index idiom (replaces (x, i))
for xs, ys (x, y) { } // parallel (zip) iteration
for xs (x) => sum += x; // arrow body (full statement)
First-iterable-wins: the first iterable's length drives the loop and
must be bounded; the other positions follow by their own cursors (a
non-first range's end is not consulted or evaluated; a shorter
non-first collection is read past its length on mismatch). The old
single-iterable index capture is replaced by the trailing open range.
Capture/call disambiguation is positional: the paren group immediately
before '{' or '=>' is the capture, every earlier top-level group is a
call. 'for zip(a, b) (x, y)' calls zip; 'for f(n) { }' reads (n) as
the capture and errors with a parenthesize/add-capture hint. The old
':' form errors with a migration hint.
Lowering is unified across forms: one cursor slot per position (ranges
start at their start, collections at 0), all advanced together, the
first position's bound terminating. inline for keeps the single
bounded comptime range.
Migrated the full corpus (examples, library modules, issue repros,
in-source test strings). New coverage: examples/0050 (the full feature
surface) and examples/1149-1155 (seven diagnostic faces). specs.md For
Loop section + grammar rewritten; readme teaser updated.
lowerBreak/lowerContinue emitted a bare br, and the enclosing block's
emitBlockDefers — seeing the terminator — discarded the pending entries
on the assumption a return had already drained them. The breaking
iteration's defers were silently skipped, leaking whatever the cleanup
released.
Lowering.loop_defer_base records the defer-stack height at each loop's
body start (while / for / range-for, saved and restored alongside
break_target); break/continue drain non-onfail entries down to it in
LIFO order via the non-truncating emitLoopExitDefers before branching.
Truncation stays with the lexical block exits — the same entries still
belong to the fall-through path after the branch containing the break.
break/continue outside a loop now diagnose instead of no-op'ing.
Regression: examples/0049-basic-defer-break-continue.sx (for and while,
break and continue, nested-block LIFO drain).
lowerFor's by-value element fetch emitted index_get on the array VALUE;
the emitter realizes that as a whole-array spill to a stack temp + GEP,
per iteration — O(N^2) bytes copied per loop (and pre-0109 it also grew
the stack per iteration, segfaulting a [4096]s64 loop).
When the iterable is an array with addressable storage (and not deref'd
from a pointer, whose identifier alloca holds the pointer rather than
the array), the fetch is now index_gep on the storage + one element
load. Storage-less arrays keep the index_get fallback. The loaded
element remains a copy — mutating the capture does not write back.
Regression: examples/0048-basic-for-array-large.sx (sum over 4096
elements + by-value copy-guard).
An alloca built at its use site re-executes on every pass through that
block, and LLVM reclaims allocas only at ret — so loop-body locals,
nested-loop index slots, and emitter spill temps (ig.tmp, sret slots, ABI
coercion temps, byval materialization) grew the stack per iteration and
long loops segfaulted on stack exhaustion.
New LLVMEmitter.buildEntryAlloca inserts after existing entry-block
allocas and restores the builder position; every LLVMBuildAlloca site
reachable during instruction emission now routes through it.
Initialization stores stay at the use site (per-iteration re-init is
unchanged), and entry slots become mem2reg-promotable. The 35 .ir
snapshot diffs are pure alloca position moves (type multisets verified
identical per file).
Regression: examples/0047-basic-loop-local-stack-reuse.sx (segfaulted
pre-fix on both the 1M-iteration body-local loop and the 3M-iteration
nested loop).
lowerVarDecl (unannotated) and lowerDestructureDecl now clear target_type
around the initializer lowering: a declaration without annotation provides
no target, so int/float literals take their spec defaults (s64/f64) instead
of the enclosing function's implicit-return type (x := 0 in a -> s8 fn was
s8; big := 3000000000 in -> s32 silently wrapped to -1294967296).
Regression: examples/0173-types-int-literal-default-s64.sx. The remaining
explicit-annotation wrap (x : s8 = 300) is filed as issue 0112.
When a module declares `A :: B; B :: u64;` and both a flat import and a
namespaced import export `B :: u8`, the flat import's B was discovered by
flatTypeAuthorCount before the own B :: u64 was processed — binding A to
u8 and silently truncating values.
Fix: ownConstDeclIsPendingAlias guard added to selectNominalLeaf between
the own-alias check and the flat-import walk. If the querying module has
an own const_decl for the name that is not yet in type_aliases_by_source,
return .pending so the forward-alias fixpoint resolves it correctly.
Regression: examples/0830-modules-flat-ns-same-name-forward-alias.sx
(x : A = 300 prints 300, not 44). 541/541 tests pass.
S0 of the ratified Fork C plan (zero-legacy name-resolution redesign, S0→S6).
Pure setup/documentation: NO production code change, NO behavior change.
Single-author output byte-identical to wt-stdlib-base by construction.
Deliverables under docs/fork-c/ (docs/, not current/, because current/ is
gitignored and the contract must be committed):
S0.1 — byte-baseline + commit-discipline: the committed examples/expected/*
snapshots are the single-author byte-identity reference; the zero-diff repro is
`zig build && zig build test && bash tests/run_examples.sh`. Resolver-target set
explicitly excluded + listed. Commit-classification rule: mirror | consumer-cutover | deletion.
S0.2 — E6b disposition + two-corpus partition: transitional E6b src NOT merged
(grep-clean: no resolveRegistrationSigTypeInSource / sig_registration_mode /
e6br_gate.test.zig on baseline). Harvested 0811–0829 trees + goldens (never the
src), empirically partitioned by running each through the base compiler vs the
E6b target:
- baseline-green (mirror-equivalence): 0795–0798 (merged) + 0823, 0828 — given
examples/expected/ markers, locked into the S0 baseline.
- resolver-target (known-wrong old behavior): 0811–0822, 0824–0827, 0829 + the
re-filed E6BR-5 nested-pattern regression — a listed xfail harness under
tests/resolver-target/ (manifest + TARGET goldens, NO active marker), flips
active+green at S3.9. 0811/0829 noted as old-selector-wrong on the E6b-unmerged
base; E6BR-5 subsumed by the whole-AST resolver, NOT an E6b attempt-6.
S0.3 — A–E6 reuse/delete ledger: every load-bearing A–E6 artifact mapped REUSED
(Fork C home) or DELETED/TRANSITIONAL (S3/S6 phase); E6c/d/e dropped, F/H/I/K
absorbed/superseded.
Gate over the baseline-green corpus: zig build + zig build test (LSP corpus sweep
574 files, no crash) + bash tests/run_examples.sh (540 passed, 0 failed) all exit 0.
attempt-1's per-decl enum/union register path panicked on any valid
self- or mutually-referential top-level enum/union: a `*Name` field in
the body is resolved through the stateless `type_resolver.resolveNamed`,
which has no kind context and forward-stubs an as-yet-unregistered name
as a STRUCT. `internNamedTypeDecl` then `findByName`-adopted that struct
stub and called `updatePreservingKey`, whose kind-stability assert tripped
on struct -> enum/union (types.zig:446). The corpus had no recursive
enum/union, so the gate missed it.
Fix: when the slot `findByName` returns is a wrong-kind forward struct
placeholder (empty-fields struct) for an enum/union/tagged_union
registration, re-key it in place (`replaceKeyedInfo`) under the same
TypeId instead of `updatePreservingKey`. This mirrors how a self-ref
struct adopts its own (same-kind) forward stub; the new helper
`adoptsForwardStructStub` gates the re-key precisely to that case, so a
struct adopting a struct stub and every non-recursive enum/union stay on
the byte-identical `updatePreservingKey`/fresh-intern path.
Regression 0799 (single-author): self-ref union linked cells
(`next: *Node`), self-ref enum/tagged-union (`branch: *Tree`), and a
mutual-ref pair (A holds *B, B holds *A); builds and walks each recursive
link. Fail-before: panic at registerUnionDecl on eed2f99. Pass-after:
exit 0, "union=7 enum=42 mutual=99".
Gate: zig build && zig build test && run_examples.sh all exit 0
(538 passed, 0 failed; 0795-0798 + 0752-0794 + FFI byte-identical);
m3te ios-sim build via the main binary exit 0.
Give top-level ENUM and UNION decls per-decl nominal identity so two
same-name flat enums/unions intern DISTINCT nominal TypeIds instead of
collapsing to one global last-wins entry. Establishes the reusable
non-struct register path the later E6 kind-steps (E6b error-set, E6c
protocol, E6d foreign-class) extend.
Registration side (was: stateless `type_bridge.resolveInlineEnum/Union`
`findByName` last-wins short-circuit, no Lowering access):
- Split the type_bridge inline builders into a body-BUILDER
(`buildEnumInfo` / `buildUnionInfo`) + the existing thin interner
wrappers (field-type positions keep the legacy single-slot path).
- Add `Lowering.registerEnumDecl` / `registerUnionDecl` mirroring
`registerStructDecl`: build the TypeInfo, intern via
`internNamedTypeDecl(decl_key, name_id, info, nominal_id)` under the
per-decl nominal identity (reserved slot id, else `shadowNominalId`).
- Reroute all six enum/union registration dispatch sites (scanDecls
const-wrapped + top-level, lowerDecls/comptime, block-local, local
const) to the new path.
Shared infra generalized ONCE:
- Pass-0b genuine-shadow pre-pass now reserves struct/enum/union shadow
slots of the MATCHING kind, grouped by (kind, name), via a kind-generic
`topLevelTypeDecl` / `reserveShadowSlot`. A forward/self/mutual ref to a
shadow name binds to the reserved nominal TypeId.
- `namedRefTid` consults `type_decl_tids` for `.enum_decl`/`.union_decl`
before the global `findByName`.
No new per-kind resolution path: selectNominalLeaf / headTypeGate /
flatTypeAuthorCount already gate every kind. Single-author /
phantom-double-spelling names keep nominal_id 0 (byte-identical corpus).
Regressions 0795-0798 (enum + union: ambiguity over every bare-type form,
and own-wins with distinct nominal TypeIds), fail-before/pass-after:
0795/0797 exit 0 -> exit 1 with the loud "type is ambiguous" diagnostic;
0796 silently printed `own=.east` -> correct `own=.north`; 0798 hard
`field 'm' not found` error -> correct `own=5 dep=9`.
Gate: zig build && zig build test (423/423) && run_examples.sh (537/537)
all exit 0; m3te ios-sim build via the main binary exit 0.
Value-const SELECTION was source-aware for emission/folding (F2/R1/F1), but
expression TYPE inference still read the global last-wins `module_const_map`,
so an inferred return type / coercion on a same-name const borrowed another
module's const TYPE (mixed-type same-name consts were never exercised by the
attempt-1 same-typed goldens).
- expr_typer.zig: the `.identifier` const path now selects via the source-aware
`selectModuleConst` (own-wins / one-flat-visible) instead of the global
`module_const_map`. The global map still gates "is this a const name?"; an
unpartitioned registration-only author emits its global type, and an ambiguous
bare reference yields `.unresolved` (the emission path diagnoses loudly).
- lower.zig: expose `selectModuleConst` so the type-inference path shares the one
author selector emission/folding already use.
Audited every `module_const_map` read: emission (4102) and global-init copy
(1447) were already source-aware (attempt-1); the binds-a-value predicate (6400)
is a boolean, not a type read; the in-`selectModuleConst` read (13842) is the
unwired fallback. No sibling inference site leaks.
examples: 0793 mixed-type own-wins inference (A's `K:s32` yields `1`, not the
global `f64`'s `1.000000`); 0794 mixed-type bare → loud ambiguous (exit 1), the
inference change does not mask the ambiguity. Prior E5 surfaces (0786-0792), the
0105 set (0752-0758), E1-E4 type surfaces (0763-0785) and FFI byte-identical;
533 markers green.
Track the 21 examples/expected/078x golden markers (exit/stdout/stderr for
0786-0792) generated alongside 5df4ac6. The E5 source change and example
sources were committed there; these regression markers were generated on disk
(the example gate passes against them) but left untracked, leaving the tree
dirty and the new regressions unpinned in git. No source or golden content
changes — markers verified byte-for-byte against the current binary via
run_examples.sh (531 passed, 0 failed).
- 0786 own-wins (a=1 b=2)
- 0787 bare same-name two-flat-visible -> loud ambiguous (exit 1)
- 0788 expr-chain value+dimension coherent (a_len=2 a_val=2 b_len=11 b_val=11)
- 0789 imported expr-const nested leaves pinned to author source (val=2 len=2)
- 0790 cross-module same-name cycle-guard, no false cycle (m=3 len=3)
- 0791 multi-level cross-module chain (big=102 bk=11)
- 0792 struct-field registration-time dimension (a_sz=2 b_sz=7)
