794a49e938
105/105 regression tests pass (+ffi-objc-call-07-fp-hfa-return). Same round-trip pattern as 1.8 — register an Obj-C class at runtime with class_addMethod, IMP returns specific non-zero values, #objc_call reads them back — but for an all-double 32 B HFA instead of a 24 B int aggregate. Locks in the f32-vs-f64 landmine that bit us when we first wrote safeAreaInsets in uikit.sx: the homogeneous-float-aggregate ABI routes 1..4 f32 or f64 fields through v0..v3 (AAPCS64) / xmm0..xmm3 (SysV AMD64) WITHOUT integer coercion. As long as the LLVM call-site function type carries the precise struct (which our `objc_msg_send` arm does), the backend lowers it correctly. This is the smaller cousin of 1.8 — 1.8 needed an emit_llvm code change to make the sret transform work; 1.9 needs no codegen change because HFAs of any size up to v0..v3 stay register-resident. The test just pins that path with a real, value-bearing IMP so a future ABI-rule shake-up has a regression net.
47 lines
1.7 KiB
Plaintext
47 lines
1.7 KiB
Plaintext
// Phase 1 step 1.9 (PLAN-FFI.md): all-double HFA returns through
|
||
// `#objc_call`. 4×f64 = 32 B, stays in v0..v3 on AAPCS64 and
|
||
// xmm0..xmm3 on SysV AMD64 — same shape as UIEdgeInsets / NSRect /
|
||
// CGRect, the f32-vs-f64 landmine that bit us when we first wrote
|
||
// `safeAreaInsets` in uikit.sx.
|
||
//
|
||
// Nominally covered by ffi-objc-call-05's nil-recv NSRect case,
|
||
// but that only checks that zeros come back. Here we install a
|
||
// real IMP that returns specific non-zero values and verify each
|
||
// field comes through the float-register file intact.
|
||
|
||
#import "modules/std.sx";
|
||
#import "modules/compiler.sx";
|
||
#import "modules/std/objc.sx";
|
||
|
||
UIEdgeInsets :: struct {
|
||
top: f64;
|
||
left: f64;
|
||
bottom: f64;
|
||
right: f64;
|
||
}
|
||
|
||
insets_imp :: (self: *void, _cmd: *void) -> UIEdgeInsets callconv(.c) {
|
||
UIEdgeInsets.{ top = 1.5, left = 2.5, bottom = 3.5, right = 4.5 };
|
||
}
|
||
|
||
main :: () -> s32 {
|
||
inline if OS == .macos {
|
||
ns_object := objc_getClass("NSObject".ptr);
|
||
my_cls := objc_allocateClassPair(ns_object, "SxInsetsProbe".ptr, 0);
|
||
sel := sel_registerName("safeAreaInsets".ptr);
|
||
// Method type encoding: {UIEdgeInsets=dddd}@: → returns 4×f64,
|
||
// implicit (self: id, _cmd: SEL). `d` = double.
|
||
ok := class_addMethod(my_cls, sel, xx insets_imp, "{UIEdgeInsets=dddd}@:".ptr);
|
||
print("addMethod = {}\n", ok);
|
||
objc_registerClassPair(my_cls);
|
||
|
||
instance := class_createInstance(my_cls, 0);
|
||
ins := #objc_call(UIEdgeInsets)(instance, "safeAreaInsets");
|
||
print("insets = ({}, {}, {}, {})\n", ins.top, ins.left, ins.bottom, ins.right);
|
||
}
|
||
inline if OS != .macos {
|
||
print("skipped (not macos)\n");
|
||
}
|
||
0;
|
||
}
|