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sx/tests/expected/ffi-objc-call-03-selector-sharing.ir
agra b8a412ddc7 ffi 1.5: intern Obj-C selectors — one static SEL slot per unique name 
101/101 regression tests pass; the IR snapshot for the selector-
sharing test diff flips from four per-call `sel_registerName` calls
to two (one per unique selector) routed through a module-init
constructor — matching what clang emits for `@selector(...)`.

Hot-path cost collapses from a libobjc hashtable lookup per call to
a single load of a static `SEL*` slot:

  Before (Phase 1.3):
    %sel = call ptr @sel_registerName(<"init">)
    call ptr @objc_msgSend(<recv>, %sel)

  After (Phase 1.5):
    %sel = load ptr, ptr @OBJC_SELECTOR_REFERENCES_init
    call ptr @objc_msgSend(<recv>, %sel)

  +  @OBJC_SELECTOR_REFERENCES_init    = internal global ptr null
  +  @OBJC_SELECTOR_REFERENCES_release = internal global ptr null
  +  define internal void @__sx_objc_selector_init() {
  +    %sel  = call ptr @sel_registerName(ptr @OBJC_METH_VAR_NAME_)
  +    store ptr %sel, ptr @OBJC_SELECTOR_REFERENCES_init
  +    %sel1 = call ptr @sel_registerName(ptr @OBJC_METH_VAR_NAME_.2)
  +    store ptr %sel1, ptr @OBJC_SELECTOR_REFERENCES_release
  +    ret void
  +  }
  +  @llvm.global_ctors = appending global [1 x { i32, ptr, ptr }]
  +    [{ ..., ptr @__sx_objc_selector_init, ptr null }]

Implementation:
  module.zig    | new `objc_selector_cache: ArrayList(ObjcSelectorEntry)`
                  with `lookupObjcSelector` / `appendObjcSelector`. List
                  (not hashmap) keeps emit order stable across builds so
                  the IR snapshot doesn't flicker on rehash.
  lower.zig     | `internObjcSelector(sel)` creates the slot on first
                  use, returns the same `GlobalId` on every subsequent
                  call to the same selector. lowerFfiIntrinsicCall now
                  emits `global_addr + load` for literal selectors.
                  Non-literal selectors keep the `sel_registerName`
                  fallback. Declaring `sel_registerName` lazily on
                  first intern so emit_llvm finds it for the
                  constructor body.
  emit_llvm.zig | new `emitObjcSelectorInit` pass synthesizes a void
                  constructor that loops over the cache, calls
                  `sel_registerName` for each unique selector string,
                  stores the result in the slot. Constructor is
                  registered in `@llvm.global_ctors` with default
                  priority (65535) so dyld runs it before main.

The `@OBJC_METH_VAR_NAME_` private string globals and unnamed-addr
flag match clang's exact emission shape — picked up by the system
linker into the right Mach-O sections on macOS / iOS. Chess
Android + iOS-sim still build clean (no `#objc_call` in chess yet —
phase-3 migration will start exercising this).
2026-05-19 13:09:34 +03:00

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@context = internal global { { ptr, ptr, ptr }, ptr } zeroinitializer
@OS = internal global i64 0
@ARCH = internal global i64 0
@POINTER_SIZE = internal global i64 8
@OBJC_SELECTOR_REFERENCES_init = internal global ptr null
@OBJC_SELECTOR_REFERENCES_release = internal global ptr null
@str = private unnamed_addr constant [4 x i8] c"ok\0A\00", align 1
@str.1 = private unnamed_addr constant [1 x i8] zeroinitializer, align 1
@OBJC_METH_VAR_NAME_ = private unnamed_addr constant [5 x i8] c"init\00"
@OBJC_METH_VAR_NAME_.2 = private unnamed_addr constant [8 x i8] c"release\00"
@llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 65535, ptr @__sx_objc_selector_init, ptr null }]
; Function Attrs: nounwind
declare void @out(ptr) #0
declare ptr @malloc(i64)
declare ptr @memcpy(ptr, ptr, i64)
declare ptr @memset(ptr, i32, i64)
declare void @free(ptr)
; Function Attrs: nounwind
declare void @GPA.create(ptr sret({ ptr, ptr, ptr }), ptr) #0
; Function Attrs: nounwind
define internal ptr @GPA.alloc(ptr %0, i64 %1) #0 {
entry:
%alloca = alloca ptr, align 8
store ptr %0, ptr %alloca, align 8
%allocaN = alloca i64, align 8
store i64 %1, ptr %allocaN, align 8
%load = load ptr, ptr %alloca, align 8
%gep = getelementptr inbounds { i64 }, ptr %load, i32 0, i32 0
%loadN = load i64, ptr %gep, align 8
%add = add i64 %loadN, 1
store i64 %add, ptr %gep, align 8
%loadN = load i64, ptr %allocaN, align 8
%malloc = call ptr @malloc(i64 %loadN)
ret ptr %malloc
}
; Function Attrs: nounwind
define internal void @GPA.dealloc(ptr %0, ptr %1) #0 {
entry:
%alloca = alloca ptr, align 8
store ptr %0, ptr %alloca, align 8
%allocaN = alloca ptr, align 8
store ptr %1, ptr %allocaN, align 8
%load = load ptr, ptr %alloca, align 8
%gep = getelementptr inbounds { i64 }, ptr %load, i32 0, i32 0
%loadN = load i64, ptr %gep, align 8
%sub = sub i64 %loadN, 1
store i64 %sub, ptr %gep, align 8
%loadN = load ptr, ptr %allocaN, align 8
call void @free(ptr %loadN)
ret void
}
; Function Attrs: nounwind
declare void @Arena.add_chunk(ptr, i64) #0
; Function Attrs: nounwind
declare void @Arena.create(ptr sret({ ptr, ptr, ptr }), ptr, ptr, i64) #0
; Function Attrs: nounwind
declare void @Arena.reset(ptr) #0
; Function Attrs: nounwind
declare void @Arena.deinit(ptr) #0
; Function Attrs: nounwind
declare ptr @Arena.alloc(ptr, i64) #0
; Function Attrs: nounwind
declare void @Arena.dealloc(ptr, ptr) #0
; Function Attrs: nounwind
declare void @BufAlloc.create(ptr sret({ ptr, ptr, ptr }), ptr, ptr, i64) #0
; Function Attrs: nounwind
declare void @BufAlloc.reset(ptr) #0
; Function Attrs: nounwind
declare ptr @BufAlloc.alloc(ptr, i64) #0
; Function Attrs: nounwind
declare void @BufAlloc.dealloc(ptr, ptr) #0
; Function Attrs: nounwind
define internal { ptr, i64 } @cstring(i64 %0) #0 {
entry:
%alloca = alloca i64, align 8
store i64 %0, ptr %alloca, align 8
%load = load i64, ptr %alloca, align 8
%add = add i64 %load, 1
%heap = call ptr @malloc(i64 %add)
%allocaN = alloca ptr, align 8
store ptr %heap, ptr %allocaN, align 8
%loadN = load ptr, ptr %allocaN, align 8
%loadN = load i64, ptr %alloca, align 8
%addN = add i64 %loadN, 1
%1 = call ptr @memset(ptr %loadN, i32 0, i64 %addN)
%allocaN = alloca { ptr, i64 }, align 8
store { ptr, i64 } undef, ptr %allocaN, align 8
%loadN = load ptr, ptr %allocaN, align 8
%gep = getelementptr inbounds { ptr, i64 }, ptr %allocaN, i32 0, i32 0
store ptr %loadN, ptr %gep, align 8
%loadN = load i64, ptr %alloca, align 8
%gepN = getelementptr inbounds { ptr, i64 }, ptr %allocaN, i32 0, i32 1
store i64 %loadN, ptr %gepN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
ret { ptr, i64 } %loadN
}
; Function Attrs: nounwind
declare ptr @int_to_string(i64) #0
; Function Attrs: nounwind
declare ptr @bool_to_string(i1) #0
; Function Attrs: nounwind
declare ptr @float_to_string(double) #0
; Function Attrs: nounwind
declare void @hex_group(ptr, i64, i64) #0
; Function Attrs: nounwind
declare ptr @int_to_hex_string(i64) #0
; Function Attrs: nounwind
define internal { ptr, i64 } @concat({ ptr, i64 } %0, { ptr, i64 } %1) #0 {
entry:
%alloca = alloca { ptr, i64 }, align 8
store { ptr, i64 } %0, ptr %alloca, align 8
%allocaN = alloca { ptr, i64 }, align 8
store { ptr, i64 } %1, ptr %allocaN, align 8
%load = load { ptr, i64 }, ptr %alloca, align 8
%len = extractvalue { ptr, i64 } %load, 1
%allocaN = alloca i64, align 8
store i64 %len, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%lenN = extractvalue { ptr, i64 } %loadN, 1
%allocaN = alloca i64, align 8
store i64 %lenN, ptr %allocaN, align 8
%loadN = load i64, ptr %allocaN, align 8
%loadN = load i64, ptr %allocaN, align 8
%add = add i64 %loadN, %loadN
%call = call { ptr, i64 } @cstring(i64 %add)
%allocaN = alloca { ptr, i64 }, align 8
store { ptr, i64 } %call, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%dptr = extractvalue { ptr, i64 } %loadN, 0
%loadN = load { ptr, i64 }, ptr %alloca, align 8
%dptrN = extractvalue { ptr, i64 } %loadN, 0
%loadN = load i64, ptr %allocaN, align 8
%2 = call ptr @memcpy(ptr %dptr, ptr %dptrN, i64 %loadN)
%loadN = load i64, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%igp.data = extractvalue { ptr, i64 } %loadN, 0
%igp.ptr = getelementptr i8, ptr %igp.data, i64 %loadN
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%dptrN = extractvalue { ptr, i64 } %loadN, 0
%loadN = load i64, ptr %allocaN, align 8
%3 = call ptr @memcpy(ptr %igp.ptr, ptr %dptrN, i64 %loadN)
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
ret { ptr, i64 } %loadN
}
; Function Attrs: nounwind
define internal { ptr, i64 } @substr({ ptr, i64 } %0, i64 %1, i64 %2) #0 {
entry:
%alloca = alloca { ptr, i64 }, align 8
store { ptr, i64 } %0, ptr %alloca, align 8
%allocaN = alloca i64, align 8
store i64 %1, ptr %allocaN, align 8
%allocaN = alloca i64, align 8
store i64 %2, ptr %allocaN, align 8
%load = load i64, ptr %allocaN, align 8
%call = call { ptr, i64 } @cstring(i64 %load)
%allocaN = alloca { ptr, i64 }, align 8
store { ptr, i64 } %call, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%dptr = extractvalue { ptr, i64 } %loadN, 0
%loadN = load i64, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %alloca, align 8
%igp.data = extractvalue { ptr, i64 } %loadN, 0
%igp.ptr = getelementptr i8, ptr %igp.data, i64 %loadN
%loadN = load i64, ptr %allocaN, align 8
%3 = call ptr @memcpy(ptr %dptr, ptr %igp.ptr, i64 %loadN)
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
ret { ptr, i64 } %loadN
}
; Function Attrs: nounwind
declare ptr @any_to_string([2 x i64]) #0
; Function Attrs: nounwind
declare ptr @build_format(ptr) #0
; Function Attrs: nounwind
declare void @BuildOptions.add_link_flag(i64, ptr) #0
; Function Attrs: nounwind
declare void @BuildOptions.add_framework(i64, ptr) #0
; Function Attrs: nounwind
declare void @BuildOptions.set_output_path(i64, ptr) #0
; Function Attrs: nounwind
declare void @BuildOptions.set_wasm_shell(i64, ptr) #0
; Function Attrs: nounwind
declare i64 @build_options() #0
; Function Attrs: nounwind
define i32 @main() #0 {
entry:
%alloca = alloca { i64 }, align 8
store { i64 } zeroinitializer, ptr %alloca, align 8
%si = insertvalue { ptr, ptr, ptr } undef, ptr %alloca, 0
%siN = insertvalue { ptr, ptr, ptr } %si, ptr @__thunk_GPA_Allocator_alloc, 1
%siN = insertvalue { ptr, ptr, ptr } %siN, ptr @__thunk_GPA_Allocator_dealloc, 2
%siN = insertvalue { { ptr, ptr, ptr }, ptr } undef, { ptr, ptr, ptr } %siN, 0
%siN = insertvalue { { ptr, ptr, ptr }, ptr } %siN, ptr null, 1
store { { ptr, ptr, ptr }, ptr } %siN, ptr @context, align 8
%load = load ptr, ptr @OBJC_SELECTOR_REFERENCES_init, align 8
%call = call ptr @objc_msgSend(ptr null, ptr %load)
%loadN = load ptr, ptr @OBJC_SELECTOR_REFERENCES_init, align 8
%callN = call ptr @objc_msgSend(ptr null, ptr %loadN)
%loadN = load ptr, ptr @OBJC_SELECTOR_REFERENCES_init, align 8
%callN = call ptr @objc_msgSend(ptr null, ptr %loadN)
%loadN = load ptr, ptr @OBJC_SELECTOR_REFERENCES_release, align 8
%callN = call ptr @objc_msgSend(ptr null, ptr %loadN)
%allocaN = alloca { ptr, i64 }, align 8
%gep = getelementptr inbounds { ptr, i64 }, ptr %allocaN, i32 0, i32 0
store ptr null, ptr %gep, align 8
%gepN = getelementptr inbounds { ptr, i64 }, ptr %allocaN, i32 0, i32 1
store i64 0, ptr %gepN, align 8
%allocaN = alloca { ptr, i64 }, align 8
store { ptr, i64 } { ptr @str, i64 3 }, ptr %allocaN, align 8
%allocaN = alloca { ptr, i64 }, align 8
store { ptr, i64 } { ptr @str.1, i64 0 }, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%callN = call { ptr, i64 } @substr({ ptr, i64 } %loadN, i64 0, i64 3)
%callN = call { ptr, i64 } @concat({ ptr, i64 } %loadN, { ptr, i64 } %callN)
store { ptr, i64 } %callN, ptr %allocaN, align 8
%loadN = load { ptr, i64 }, ptr %allocaN, align 8
%str.ptr = extractvalue { ptr, i64 } %loadN, 0
%str.len = extractvalue { ptr, i64 } %loadN, 1
%0 = call i64 @write(i32 1, ptr %str.ptr, i64 %str.len)
ret i32 0
}
; Function Attrs: nounwind
define internal ptr @__thunk_GPA_Allocator_alloc(ptr %0, i64 %1) #0 {
entry:
%call = call ptr @GPA.alloc(ptr %0, i64 %1)
ret ptr %call
}
; Function Attrs: nounwind
define internal void @__thunk_GPA_Allocator_dealloc(ptr %0, ptr %1) #0 {
entry:
call void @GPA.dealloc(ptr %0, ptr %1)
ret void
}
; Function Attrs: nounwind
declare ptr @sel_registerName(ptr) #0
; Function Attrs: nounwind
declare ptr @objc_msgSend(ptr, ptr) #0
declare i64 @write(i32, ptr, i64)
define internal void @__sx_objc_selector_init() {
entry:
%sel = call ptr @sel_registerName(ptr @OBJC_METH_VAR_NAME_)
store ptr %sel, ptr @OBJC_SELECTOR_REFERENCES_init, align 8
%selN = call ptr @sel_registerName(ptr @OBJC_METH_VAR_NAME_.2)
store ptr %selN, ptr @OBJC_SELECTOR_REFERENCES_release, align 8
ret void
}
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