translate-c: Struct fields default to zero value
C99 introduced designated initializers for structs. Omitted fields are implicitly initialized to zero. Some C APIs are designed with this in mind. Defaulting to zero values for translated struct fields permits Zig code to comfortably use such an API. Closes #8165
This commit is contained in:
Jay Petacat
committed by
Andrew Kelley
Andrew Kelley
parent
5af5d87ad2
commit
f91ff9a746
@@ -98,8 +98,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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++ " " ++ default_enum_type ++
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\\;
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\\pub const Bar = extern struct {
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\\ a: c_int,
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\\ b: c_int,
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\\ a: c_int = @import("std").mem.zeroes(c_int),
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\\ b: c_int = @import("std").mem.zeroes(c_int),
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\\};
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});
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@@ -149,11 +149,11 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\#define PTR void *
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, &[_][]const u8{
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\\pub const struct_Bar_1 = extern struct {
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\\ a: c_int,
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\\ a: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\pub const struct_Foo = extern struct {
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\\ a: c_int,
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\\ b: struct_Bar_1,
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\\ a: c_int = @import("std").mem.zeroes(c_int),
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\\ b: struct_Bar_1 = @import("std").mem.zeroes(struct_Bar_1),
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\\};
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\\pub export var a: struct_Foo = struct_Foo{
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\\ .a = 0,
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@@ -183,9 +183,9 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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, &[_][]const u8{
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\\pub export fn foo() void {
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\\ const struct_Foo = extern struct {
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\\ A: c_int,
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\\ B: c_int,
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\\ C: c_int,
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\\ A: c_int = @import("std").mem.zeroes(c_int),
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\\ B: c_int = @import("std").mem.zeroes(c_int),
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\\ C: c_int = @import("std").mem.zeroes(c_int),
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\\ };
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\\ var a: struct_Foo = struct_Foo{
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\\ .A = @as(c_int, 0),
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@@ -195,9 +195,9 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\ _ = @TypeOf(a);
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\\ {
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\\ const struct_Foo_1 = extern struct {
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\\ A: c_int,
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\\ B: c_int,
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\\ C: c_int,
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\\ A: c_int = @import("std").mem.zeroes(c_int),
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\\ B: c_int = @import("std").mem.zeroes(c_int),
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\\ C: c_int = @import("std").mem.zeroes(c_int),
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\\ };
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\\ var a_2: struct_Foo_1 = struct_Foo_1{
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\\ .A = @as(c_int, 0),
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@@ -286,7 +286,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\source.h:1:9: warning: struct demoted to opaque type - unable to translate type of field foo
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\\pub const Foo = opaque {};
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\\pub const Bar = extern struct {
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\\ bar: ?*Foo,
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\\ bar: ?*Foo = @import("std").mem.zeroes(?*Foo),
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\\};
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});
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@@ -375,10 +375,10 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\#define B A(0.f)
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, &[_][]const u8{
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\\pub const struct_Color = extern struct {
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\\ r: u8,
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\\ g: u8,
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\\ b: u8,
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\\ a: u8,
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\\ r: u8 = @import("std").mem.zeroes(u8),
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\\ g: u8 = @import("std").mem.zeroes(u8),
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\\ b: u8 = @import("std").mem.zeroes(u8),
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\\ a: u8 = @import("std").mem.zeroes(u8),
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\\};
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\\pub const Color = struct_Color;
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,
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@@ -389,14 +389,14 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\pub const LIGHTGRAY = @import("std").mem.zeroInit(CLITERAL(Color), .{ @as(c_int, 200), @as(c_int, 200), @as(c_int, 200), @as(c_int, 255) });
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,
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\\pub const struct_boom_t = extern struct {
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\\ i1: c_int,
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\\ i1: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\pub const boom_t = struct_boom_t;
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,
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\\pub const FOO = @import("std").mem.zeroInit(boom_t, .{@as(c_int, 1)});
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,
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\\pub const MyCStruct = extern struct {
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\\ x: f32,
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\\ x: f32 = @import("std").mem.zeroes(f32),
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\\};
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,
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\\pub inline fn A(_x: anytype) MyCStruct {
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@@ -452,7 +452,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\pub const struct_foo = extern struct {
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\\ bar: c_short align(1),
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\\ bar: c_short align(1) = @import("std").mem.zeroes(c_short),
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\\};
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});
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@@ -461,7 +461,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\struct bar { int x; int y[0]; };
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, &[_][]const u8{
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\\pub const struct_foo = extern struct {
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\\ x: c_int align(4),
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\\ x: c_int align(4) = @import("std").mem.zeroes(c_int),
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\\ pub fn y(self: anytype) @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int) {
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\\ const Intermediate = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), u8);
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\\ const ReturnType = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int);
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@@ -469,7 +469,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\ }
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\\};
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\\pub const struct_bar = extern struct {
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\\ x: c_int align(4),
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\\ x: c_int align(4) = @import("std").mem.zeroes(c_int),
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\\ pub fn y(self: anytype) @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int) {
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\\ const Intermediate = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), u8);
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\\ const ReturnType = @import("std").zig.c_translation.FlexibleArrayType(@TypeOf(self), c_int);
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@@ -545,7 +545,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\source.h:4:8: warning: struct demoted to opaque type - unable to translate type of field abufused
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\\pub const struct_arcan_shmif_page = opaque {};
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\\pub const struct_arcan_shmif_cont = extern struct {
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\\ addr: ?*struct_arcan_shmif_page,
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\\ addr: ?*struct_arcan_shmif_page = @import("std").mem.zeroes(?*struct_arcan_shmif_page),
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\\};
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});
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@@ -562,10 +562,10 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\pub const fnptr_ty = ?*const fn () callconv(.C) void;
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\\pub const fnptr_attr_ty = ?*const fn () callconv(.C) void;
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\\pub const struct_foo = extern struct {
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\\ foo: ?*const fn () callconv(.C) void,
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\\ bar: ?*const fn () callconv(.C) void,
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\\ baz: fnptr_ty,
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\\ qux: fnptr_attr_ty,
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\\ foo: ?*const fn () callconv(.C) void = @import("std").mem.zeroes(?*const fn () callconv(.C) void),
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\\ bar: ?*const fn () callconv(.C) void = @import("std").mem.zeroes(?*const fn () callconv(.C) void),
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\\ baz: fnptr_ty = @import("std").mem.zeroes(fnptr_ty),
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\\ qux: fnptr_attr_ty = @import("std").mem.zeroes(fnptr_attr_ty),
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\\};
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});
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@@ -624,14 +624,14 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\void foo(outer *x) { x->y = x->x; }
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, &[_][]const u8{
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\\const struct_unnamed_2 = extern struct {
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\\ y: c_int,
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\\ y: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\const union_unnamed_1 = extern union {
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\\ x: u8,
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\\ unnamed_0: struct_unnamed_2,
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\\};
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\\pub const outer = extern struct {
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\\ unnamed_0: union_unnamed_1,
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\\ unnamed_0: union_unnamed_1 = @import("std").mem.zeroes(union_unnamed_1),
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\\};
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\\pub export fn foo(arg_x: [*c]outer) void {
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\\ var x = arg_x;
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@@ -669,12 +669,12 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\foo s3 = { 123 };
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, &[_][]const u8{
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\\pub const foo = extern struct {
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\\ x: c_int,
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\\ x: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\const struct_unnamed_1 = extern struct {
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\\ x: f64,
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\\ y: f64,
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\\ z: f64,
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\\ x: f64 = @import("std").mem.zeroes(f64),
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\\ y: f64 = @import("std").mem.zeroes(f64),
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\\ z: f64 = @import("std").mem.zeroes(f64),
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\\};
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\\pub export var s0: struct_unnamed_1 = struct_unnamed_1{
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\\ .x = 1.2,
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@@ -682,12 +682,12 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\ .z = 0,
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\\};
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\\const struct_unnamed_2 = extern struct {
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\\ sec: c_int,
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\\ min: c_int,
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\\ hour: c_int,
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\\ day: c_int,
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\\ mon: c_int,
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\\ year: c_int,
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\\ sec: c_int = @import("std").mem.zeroes(c_int),
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\\ min: c_int = @import("std").mem.zeroes(c_int),
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\\ hour: c_int = @import("std").mem.zeroes(c_int),
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\\ day: c_int = @import("std").mem.zeroes(c_int),
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\\ mon: c_int = @import("std").mem.zeroes(c_int),
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\\ year: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\pub export var s1: struct_unnamed_2 = struct_unnamed_2{
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\\ .sec = @as(c_int, 30),
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@@ -698,8 +698,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\ .year = @as(c_int, 2014),
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\\};
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\\const struct_unnamed_3 = extern struct {
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\\ x: c_int,
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\\ y: c_int,
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\\ x: c_int = @import("std").mem.zeroes(c_int),
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\\ y: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\pub export var s2: struct_unnamed_3 = struct_unnamed_3{
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\\ .x = @as(c_int, 1),
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@@ -730,9 +730,9 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\struct {int x,y,z;} __attribute__((packed)) s0 = {1, 2};
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, &[_][]const u8{
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\\const struct_unnamed_1 = extern struct {
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\\ x: c_int align(1),
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\\ y: c_int align(1),
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\\ z: c_int align(1),
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\\ x: c_int align(1) = @import("std").mem.zeroes(c_int),
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\\ y: c_int align(1) = @import("std").mem.zeroes(c_int),
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\\ z: c_int align(1) = @import("std").mem.zeroes(c_int),
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\\};
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\\pub export var s0: struct_unnamed_1 = struct_unnamed_1{
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\\ .x = @as(c_int, 1),
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@@ -977,8 +977,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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, &[_][]const u8{
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\\pub const lws_callback_function = fn () callconv(.C) void;
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\\pub const struct_Foo = extern struct {
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\\ func: ?*const fn () callconv(.C) void,
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\\ callback_http: ?*const lws_callback_function,
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\\ func: ?*const fn () callconv(.C) void = @import("std").mem.zeroes(?*const fn () callconv(.C) void),
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\\ callback_http: ?*const lws_callback_function = @import("std").mem.zeroes(?*const lws_callback_function),
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\\};
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});
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@@ -993,7 +993,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\pub const struct_Foo = opaque {};
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,
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\\pub const struct_Bar = extern struct {
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\\ foo: ?*struct_Foo,
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\\ foo: ?*struct_Foo = @import("std").mem.zeroes(?*struct_Foo),
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\\};
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});
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@@ -1025,13 +1025,13 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\pub const struct_Foo = extern struct {
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\\ a: [*c]Foo,
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\\ a: [*c]Foo = @import("std").mem.zeroes([*c]Foo),
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\\};
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,
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\\pub const Foo = struct_Foo;
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,
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\\pub const struct_Bar = extern struct {
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\\ a: [*c]Foo,
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\\ a: [*c]Foo = @import("std").mem.zeroes([*c]Foo),
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\\};
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,
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\\pub const Bar = struct_Bar;
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@@ -1044,8 +1044,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\const struct_Foo = extern struct {
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\\ x: c_int,
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\\ y: [*c]u8,
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\\ x: c_int = @import("std").mem.zeroes(c_int),
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\\ y: [*c]u8 = @import("std").mem.zeroes([*c]u8),
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\\};
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,
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\\pub const Foo = struct_Foo;
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@@ -1057,7 +1057,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\pub const struct_Foo = extern struct {
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\\ derp: ?*const fn ([*c]struct_Foo) callconv(.C) void,
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\\ derp: ?*const fn ([*c]struct_Foo) callconv(.C) void = @import("std").mem.zeroes(?*const fn ([*c]struct_Foo) callconv(.C) void),
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\\};
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,
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\\pub const Foo = struct_Foo;
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@@ -1101,11 +1101,11 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\pub const struct_Bar = extern struct {
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\\ next: [*c]struct_Foo,
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\\ next: [*c]struct_Foo = @import("std").mem.zeroes([*c]struct_Foo),
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\\};
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,
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\\pub const struct_Foo = extern struct {
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\\ next: [*c]struct_Bar,
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\\ next: [*c]struct_Bar = @import("std").mem.zeroes([*c]struct_Bar),
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\\};
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});
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@@ -1121,7 +1121,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\pub const struct_comptime = extern struct {
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\\ @"defer": c_int,
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\\ @"defer": c_int = @import("std").mem.zeroes(c_int),
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\\};
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,
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\\pub const @"comptime" = struct_comptime;
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@@ -1421,8 +1421,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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// even though the parent struct is
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// this is consistent with GCC docs
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\\const struct_unnamed_1 = extern struct {
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\\ a: u8,
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\\ b: c_int,
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\\ a: u8 = @import("std").mem.zeroes(u8),
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\\ b: c_int = @import("std").mem.zeroes(c_int),
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\\};
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,
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\\pub const union_Foo = extern union {
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@@ -1448,8 +1448,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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// have an independent packed declaration on
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// the nested type (see GCC docs for details)
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\\const struct_unnamed_1 = extern struct {
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\\ a: u8 align(1),
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\\ b: c_int align(1),
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\\ a: u8 align(1) = @import("std").mem.zeroes(u8),
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\\ b: c_int align(1) = @import("std").mem.zeroes(c_int),
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\\};
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,
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\\pub const union_Foo = extern union {
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@@ -1905,8 +1905,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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++ " " ++ default_enum_type ++
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\\;
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\\pub const struct_Baz = extern struct {
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\\ l: enum_unnamed_2,
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\\ m: d,
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\\ l: enum_unnamed_2 = @import("std").mem.zeroes(enum_unnamed_2),
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\\ m: d = @import("std").mem.zeroes(d),
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\\};
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\\pub const n: c_int = 0;
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\\pub const o: c_int = 1;
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@@ -2010,7 +2010,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\pub const PFNGLCLEARPROC = ?*const fn (GLbitfield) callconv(.C) void;
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\\pub const OpenGLProc = ?*const fn () callconv(.C) void;
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\\const struct_unnamed_1 = extern struct {
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\\ Clear: PFNGLCLEARPROC,
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\\ Clear: PFNGLCLEARPROC = @import("std").mem.zeroes(PFNGLCLEARPROC),
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\\};
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\\pub const union_OpenGLProcs = extern union {
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\\ ptr: [1]OpenGLProc,
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@@ -2362,10 +2362,10 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\};
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, &[_][]const u8{
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\\pub const struct_Bar_1 = extern struct {
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\\ b: c_int,
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\\ b: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\pub const struct_Foo = extern struct {
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\\ c: struct_Bar_1,
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\\ c: struct_Bar_1 = @import("std").mem.zeroes(struct_Bar_1),
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\\};
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});
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}
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@@ -2576,8 +2576,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\void func(struct Foo *a, enum Bar **b);
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, &[_][]const u8{
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\\pub const struct_Foo = extern struct {
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\\ x: c_int,
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\\ y: c_int,
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\\ x: c_int = @import("std").mem.zeroes(c_int),
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\\ y: c_int = @import("std").mem.zeroes(c_int),
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\\};
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\\pub const BarA: c_int = 0;
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\\pub const BarB: c_int = 1;
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@@ -2694,7 +2694,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
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\\}
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, &[_][]const u8{
|
||||
\\pub const struct_Foo = extern struct {
|
||||
\\ b: c_int,
|
||||
\\ b: c_int = @import("std").mem.zeroes(c_int),
|
||||
\\};
|
||||
\\pub extern var a: struct_Foo;
|
||||
\\pub export var b: f32 = 2.0;
|
||||
@@ -3604,12 +3604,12 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
|
||||
\\} ONENAMEWITHSTRUCT;
|
||||
, &[_][]const u8{
|
||||
\\pub const struct_NAMED = extern struct {
|
||||
\\ name: c_long,
|
||||
\\ name: c_long = @import("std").mem.zeroes(c_long),
|
||||
\\};
|
||||
\\pub const NAMED = struct_NAMED;
|
||||
\\pub const struct_ONENAMEWITHSTRUCT = extern struct {
|
||||
\\ unnamed_0: struct_NAMED,
|
||||
\\ b: c_long,
|
||||
\\ unnamed_0: struct_NAMED = = @import("std").mem.zeroes(struct_NAMED),
|
||||
\\ b: c_long = @import("std").mem.zeroes(c_long),
|
||||
\\};
|
||||
});
|
||||
} else {
|
||||
@@ -3626,11 +3626,11 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
|
||||
\\} ONENAMEWITHSTRUCT;
|
||||
, &[_][]const u8{
|
||||
\\pub const struct_NAMED = extern struct {
|
||||
\\ name: c_long,
|
||||
\\ name: c_long = @import("std").mem.zeroes(c_long),
|
||||
\\};
|
||||
\\pub const NAMED = struct_NAMED;
|
||||
\\pub const struct_ONENAMEWITHSTRUCT = extern struct {
|
||||
\\ b: c_long,
|
||||
\\ b: c_long = @import("std").mem.zeroes(c_long),
|
||||
\\};
|
||||
});
|
||||
}
|
||||
@@ -3645,11 +3645,11 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
|
||||
, &[_][]const u8{
|
||||
\\const struct_unnamed_1 = extern struct {};
|
||||
\\pub const struct_a = extern struct {
|
||||
\\ unnamed_0: struct_unnamed_1,
|
||||
\\ unnamed_0: struct_unnamed_1 = @import("std").mem.zeroes(struct_unnamed_1),
|
||||
\\};
|
||||
\\const struct_unnamed_2 = extern struct {};
|
||||
\\pub const struct_b = extern struct {
|
||||
\\ unnamed_0: struct_unnamed_2,
|
||||
\\ unnamed_0: struct_unnamed_2 = @import("std").mem.zeroes(struct_unnamed_2),
|
||||
\\};
|
||||
});
|
||||
|
||||
@@ -3783,8 +3783,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
|
||||
\\pub const struct_inner = opaque {};
|
||||
,
|
||||
\\pub const struct_outer = extern struct {
|
||||
\\ thing: c_int,
|
||||
\\ sub_struct: struct_inner,
|
||||
\\ thing: c_int = @import("std").mem.zeroes(c_int),
|
||||
\\ sub_struct: struct_inner = @import("std").mem.zeroes(struct_inner),
|
||||
\\};
|
||||
,
|
||||
\\warning: unable to translate function, demoted to extern
|
||||
@@ -3812,8 +3812,8 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
|
||||
\\}
|
||||
, &[_][]const u8{
|
||||
\\pub const struct_FOO = extern struct {
|
||||
\\ x: c_int,
|
||||
\\ y: c_int,
|
||||
\\ x: c_int = @import("std").mem.zeroes(c_int),
|
||||
\\ y: c_int = @import("std").mem.zeroes(c_int),
|
||||
\\};
|
||||
\\pub export fn bar() c_int {
|
||||
\\ const foo = struct {
|
||||
@@ -4143,7 +4143,7 @@ pub fn addCases(cases: *tests.TranslateCContext) void {
|
||||
\\const char *struct_foo = "hello world";
|
||||
, &[_][]const u8{
|
||||
\\pub const struct_foo_1 = extern struct {
|
||||
\\ x: c_int,
|
||||
\\ x: c_int = @import("std").mem.zeroes(c_int),
|
||||
\\};
|
||||
,
|
||||
\\pub const foo = struct_foo_1;
|
||||
|
||||
Reference in New Issue
Block a user