mirror/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2025-12-25 15:43:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Sema: implement writing structs to memory at comptime

Browse Source
This commit is contained in:
Andrew Kelley 2022-02-06 20:07:43 -07:00
parent d4805472c3
commit 3bcce5f6d1
1 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/value.zig
View File

@ -1033,6 +1033,11 @@ pub const Value = extern union {
}
pub fn writeToMemory(val: Value, ty: Type, target: Target, buffer: []u8) void {
if (val.isUndef()) {
const size = @intCast(usize, ty.abiSize(target));
std.mem.set(u8, buffer[0..size], 0xaa);
return;
}
switch (ty.zigTypeTag()) {
.Int => {
var bigint_buffer: BigIntSpace = undefined;
@ -1068,6 +1073,14 @@ pub const Value = extern union {
buf_off += elem_size;
}
},
.Struct => {
const fields = ty.structFields().values();
const field_vals = val.castTag(.@"struct").?.data;
for (fields) |field, i| {
const off = @intCast(usize, ty.structFieldOffset(i, target));
writeToMemory(field_vals[i], field.ty, target, buffer[off..]);
}
},
else => @panic("TODO implement writeToMemory for more types"),
}
}
@ -1106,7 +1119,7 @@ pub const Value = extern union {
fn floatReadFromMemory(comptime F: type, target: Target, buffer: []const u8) F {
if (F == f80) {
// TODO: use std.math.F80Repr
// TODO: use std.math.F80Repr?
const big_int = std.mem.readInt(u128, buffer[0..16], target.cpu.arch.endian());
const int = @truncate(u80, big_int);
return @bitCast(F, int);