mirror of
https://github.com/ziglang/zig.git
synced 2025-12-12 01:03:13 +00:00
6d6cf59847
* Add AIR instructions: ret_ptr, ret_load
- This allows Sema to be blissfully unaware of the backend's decision
to implement by-val/by-ref semantics for struct/union/array types.
Backends can lower these simply as alloc, load, ret instructions,
or they can take advantage of them to use a result pointer.
* Add AIR instruction: array_elem_val
- Allows for better codegen for `Sema.elemVal`.
* Implement calculation of ABI alignment and ABI size for unions.
* Before appending the following AIR instructions to a block,
resolveTypeLayout is called on the type:
- call - return type
- ret - return type
- store_ptr - elem type
* Sema: fix memory leak in `zirArrayInit` and other cleanups to this
function.
* x86_64: implement the full x86_64 C ABI according to the spec
* Type: implement `intInfo` for error sets.
* Type: implement `intTagType` for tagged unions.
The Zig type tag `Fn` is now used exclusively for function bodies.
Function pointers are modeled as `*const T` where `T` is a `Fn` type.
* The `call` AIR instruction now allows a function pointer operand as
well as a function operand.
* Sema now has a coercion from function body to function pointer.
* Function type syntax, e.g. `fn()void`, now returns zig tag type of
Pointer with child Fn, rather than Fn directly.
- I think this should probably be reverted. Will discuss the lang
specs before doing this. Idea being that function pointers would
need to be specified as `*const fn()void` rather than `fn() void`.
LLVM backend:
* Enable calling the panic handler (previously this just
emitted `@breakpoint()` since the backend could not handle the panic
function).
* Implement sret
* Introduce `isByRef` and implement it for structs and arrays. Types
that are `isByRef` are now passed as pointers to functions, and e.g.
`elem_val` will return a pointer instead of doing a load.
* Move the function type creating code from `resolveLlvmFunction` to
`llvmType` where it belongs; now there is only 1 instance of this
logic instead of two.
* Add the `nonnull` attribute to non-optional pointer parameters.
* Fix `resolveGlobalDecl` not using fully-qualified names and not using
the `decl_map`.
* Implement `genTypedValue` for pointer-like optionals.
* Fix memory leak when lowering `block` instruction and OOM occurs.
* Implement volatile checks where relevant.
62 lines
983 B
Zig
62 lines
983 B
Zig
const std = @import("std");
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const A = packed struct {
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a: bool,
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b: bool,
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c: bool,
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d: bool,
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e: bool,
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f: bool,
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g: bool,
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h: bool,
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};
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const X = union {
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x: A,
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y: u64,
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};
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pub fn a(
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x0: i32,
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x1: i32,
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x2: i32,
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x3: i32,
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x4: i32,
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flag_a: bool,
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flag_b: bool,
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) !void {
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_ = x0;
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_ = x1;
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_ = x2;
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_ = x3;
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_ = x4;
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_ = flag_a;
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// With this bug present, `flag_b` would actually contain the value 17.
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// Note: this bug only presents itself on debug mode.
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try std.testing.expect(@ptrCast(*const u8, &flag_b).* == 1);
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}
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pub fn b(x: *X) !void {
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try a(0, 1, 2, 3, 4, x.x.a, x.x.b);
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}
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test "bug 9584" {
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var flags = A{
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.a = false,
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.b = true,
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.c = false,
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.d = false,
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.e = false,
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.f = true,
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.g = false,
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.h = false,
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};
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var x = X{
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.x = flags,
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};
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try b(&x);
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comptime if (@sizeOf(A) != 1) unreachable;
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}
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