526 lines
18 KiB
Zig
526 lines
18 KiB
Zig
const std = @import("std");
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const Type = @import("type.zig").Type;
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const log2 = std.math.log2;
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const assert = std.debug.assert;
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const BigInt = std.math.big.Int;
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const Target = std.Target;
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const Allocator = std.mem.Allocator;
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/// This is the raw data, with no bookkeeping, no memory awareness,
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/// no de-duplication, and no type system awareness.
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/// It's important for this struct to be small.
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/// This union takes advantage of the fact that the first page of memory
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/// is unmapped, giving us 4096 possible enum tags that have no payload.
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pub const Value = extern union {
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/// If the tag value is less than Tag.no_payload_count, then no pointer
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/// dereference is needed.
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tag_if_small_enough: usize,
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ptr_otherwise: *Payload,
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pub const Tag = enum {
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// The first section of this enum are tags that require no payload.
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u8_type,
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i8_type,
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isize_type,
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usize_type,
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c_short_type,
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c_ushort_type,
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c_int_type,
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c_uint_type,
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c_long_type,
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c_ulong_type,
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c_longlong_type,
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c_ulonglong_type,
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c_longdouble_type,
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f16_type,
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f32_type,
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f64_type,
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f128_type,
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c_void_type,
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bool_type,
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void_type,
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type_type,
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anyerror_type,
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comptime_int_type,
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comptime_float_type,
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noreturn_type,
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fn_naked_noreturn_no_args_type,
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single_const_pointer_to_comptime_int_type,
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const_slice_u8_type,
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zero,
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void_value,
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noreturn_value,
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bool_true,
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bool_false, // See last_no_payload_tag below.
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// After this, the tag requires a payload.
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ty,
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int_u64,
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int_i64,
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int_big,
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function,
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ref,
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ref_val,
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bytes,
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pub const last_no_payload_tag = Tag.bool_false;
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pub const no_payload_count = @enumToInt(last_no_payload_tag) + 1;
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};
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pub fn initTag(comptime small_tag: Tag) Value {
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comptime assert(@enumToInt(small_tag) < Tag.no_payload_count);
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return .{ .tag_if_small_enough = @enumToInt(small_tag) };
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}
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pub fn initPayload(payload: *Payload) Value {
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assert(@enumToInt(payload.tag) >= Tag.no_payload_count);
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return .{ .ptr_otherwise = payload };
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}
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pub fn tag(self: Value) Tag {
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if (self.tag_if_small_enough < Tag.no_payload_count) {
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return @intToEnum(Tag, @intCast(@TagType(Tag), self.tag_if_small_enough));
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} else {
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return self.ptr_otherwise.tag;
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}
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}
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pub fn cast(self: Value, comptime T: type) ?*T {
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if (self.tag_if_small_enough < Tag.no_payload_count)
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return null;
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const expected_tag = std.meta.fieldInfo(T, "base").default_value.?.tag;
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if (self.ptr_otherwise.tag != expected_tag)
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return null;
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return @fieldParentPtr(T, "base", self.ptr_otherwise);
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}
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pub fn format(
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self: Value,
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comptime fmt: []const u8,
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options: std.fmt.FormatOptions,
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out_stream: var,
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) !void {
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comptime assert(fmt.len == 0);
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var val = self;
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while (true) switch (val.tag()) {
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.u8_type => return out_stream.writeAll("u8"),
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.i8_type => return out_stream.writeAll("i8"),
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.isize_type => return out_stream.writeAll("isize"),
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.usize_type => return out_stream.writeAll("usize"),
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.c_short_type => return out_stream.writeAll("c_short"),
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.c_ushort_type => return out_stream.writeAll("c_ushort"),
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.c_int_type => return out_stream.writeAll("c_int"),
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.c_uint_type => return out_stream.writeAll("c_uint"),
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.c_long_type => return out_stream.writeAll("c_long"),
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.c_ulong_type => return out_stream.writeAll("c_ulong"),
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.c_longlong_type => return out_stream.writeAll("c_longlong"),
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.c_ulonglong_type => return out_stream.writeAll("c_ulonglong"),
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.c_longdouble_type => return out_stream.writeAll("c_longdouble"),
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.f16_type => return out_stream.writeAll("f16"),
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.f32_type => return out_stream.writeAll("f32"),
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.f64_type => return out_stream.writeAll("f64"),
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.f128_type => return out_stream.writeAll("f128"),
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.c_void_type => return out_stream.writeAll("c_void"),
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.bool_type => return out_stream.writeAll("bool"),
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.void_type => return out_stream.writeAll("void"),
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.type_type => return out_stream.writeAll("type"),
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.anyerror_type => return out_stream.writeAll("anyerror"),
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.comptime_int_type => return out_stream.writeAll("comptime_int"),
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.comptime_float_type => return out_stream.writeAll("comptime_float"),
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.noreturn_type => return out_stream.writeAll("noreturn"),
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.fn_naked_noreturn_no_args_type => return out_stream.writeAll("fn() callconv(.Naked) noreturn"),
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.single_const_pointer_to_comptime_int_type => return out_stream.writeAll("*const comptime_int"),
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.const_slice_u8_type => return out_stream.writeAll("[]const u8"),
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.zero => return out_stream.writeAll("0"),
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.void_value => return out_stream.writeAll("{}"),
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.noreturn_value => return out_stream.writeAll("unreachable"),
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.bool_true => return out_stream.writeAll("true"),
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.bool_false => return out_stream.writeAll("false"),
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.ty => return val.cast(Payload.Ty).?.ty.format("", options, out_stream),
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.int_u64 => return std.fmt.formatIntValue(val.cast(Payload.Int_u64).?.int, "", options, out_stream),
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.int_i64 => return std.fmt.formatIntValue(val.cast(Payload.Int_i64).?.int, "", options, out_stream),
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.int_big => return out_stream.print("{}", .{val.cast(Payload.IntBig).?.big_int}),
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.function => return out_stream.writeAll("(function)"),
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.ref => return out_stream.writeAll("(ref)"),
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.ref_val => {
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try out_stream.writeAll("*const ");
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val = val.cast(Payload.RefVal).?.val;
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continue;
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},
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.bytes => return std.zig.renderStringLiteral(self.cast(Payload.Bytes).?.data, out_stream),
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};
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}
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/// Asserts that the value is representable as an array of bytes.
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/// Copies the value into a freshly allocated slice of memory, which is owned by the caller.
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pub fn toAllocatedBytes(self: Value, allocator: *Allocator) Allocator.Error![]u8 {
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if (self.cast(Payload.Bytes)) |bytes| {
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return std.mem.dupe(allocator, u8, bytes.data);
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}
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unreachable;
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}
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/// Asserts that the value is representable as a type.
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pub fn toType(self: Value) Type {
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return switch (self.tag()) {
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.ty => self.cast(Payload.Ty).?.ty,
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.u8_type => Type.initTag(.@"u8"),
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.i8_type => Type.initTag(.@"i8"),
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.isize_type => Type.initTag(.@"isize"),
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.usize_type => Type.initTag(.@"usize"),
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.c_short_type => Type.initTag(.@"c_short"),
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.c_ushort_type => Type.initTag(.@"c_ushort"),
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.c_int_type => Type.initTag(.@"c_int"),
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.c_uint_type => Type.initTag(.@"c_uint"),
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.c_long_type => Type.initTag(.@"c_long"),
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.c_ulong_type => Type.initTag(.@"c_ulong"),
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.c_longlong_type => Type.initTag(.@"c_longlong"),
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.c_ulonglong_type => Type.initTag(.@"c_ulonglong"),
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.c_longdouble_type => Type.initTag(.@"c_longdouble"),
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.f16_type => Type.initTag(.@"f16"),
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.f32_type => Type.initTag(.@"f32"),
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.f64_type => Type.initTag(.@"f64"),
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.f128_type => Type.initTag(.@"f128"),
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.c_void_type => Type.initTag(.@"c_void"),
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.bool_type => Type.initTag(.@"bool"),
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.void_type => Type.initTag(.@"void"),
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.type_type => Type.initTag(.@"type"),
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.anyerror_type => Type.initTag(.@"anyerror"),
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.comptime_int_type => Type.initTag(.@"comptime_int"),
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.comptime_float_type => Type.initTag(.@"comptime_float"),
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.noreturn_type => Type.initTag(.@"noreturn"),
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.fn_naked_noreturn_no_args_type => Type.initTag(.fn_naked_noreturn_no_args),
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.single_const_pointer_to_comptime_int_type => Type.initTag(.single_const_pointer_to_comptime_int),
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.const_slice_u8_type => Type.initTag(.const_slice_u8),
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.zero,
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.void_value,
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.noreturn_value,
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.bool_true,
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.bool_false,
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.int_u64,
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.int_i64,
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.int_big,
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.function,
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.ref,
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.ref_val,
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.bytes,
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=> unreachable,
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};
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}
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/// Asserts the value is an integer.
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pub fn toBigInt(self: Value, allocator: *Allocator) Allocator.Error!BigInt {
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switch (self.tag()) {
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.ty,
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.u8_type,
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.i8_type,
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.isize_type,
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.usize_type,
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.c_short_type,
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.c_ushort_type,
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.c_int_type,
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.c_uint_type,
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.c_long_type,
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.c_ulong_type,
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.c_longlong_type,
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.c_ulonglong_type,
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.c_longdouble_type,
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.f16_type,
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.f32_type,
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.f64_type,
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.f128_type,
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.c_void_type,
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.bool_type,
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.void_type,
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.type_type,
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.anyerror_type,
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.comptime_int_type,
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.comptime_float_type,
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.noreturn_type,
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.fn_naked_noreturn_no_args_type,
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.single_const_pointer_to_comptime_int_type,
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.const_slice_u8_type,
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.void_value,
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.noreturn_value,
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.bool_true,
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.bool_false,
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.function,
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.ref,
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.ref_val,
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.bytes,
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=> unreachable,
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.zero => return BigInt.initSet(allocator, 0),
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.int_u64 => return BigInt.initSet(allocator, self.cast(Payload.Int_u64).?.int),
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.int_i64 => return BigInt.initSet(allocator, self.cast(Payload.Int_i64).?.int),
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.int_big => return self.cast(Payload.IntBig).?.big_int,
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}
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}
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/// Asserts the value is an integer and it fits in a u64
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pub fn toUnsignedInt(self: Value) u64 {
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switch (self.tag()) {
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.ty,
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.u8_type,
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.i8_type,
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.isize_type,
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.usize_type,
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.c_short_type,
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.c_ushort_type,
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.c_int_type,
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.c_uint_type,
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.c_long_type,
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.c_ulong_type,
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.c_longlong_type,
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.c_ulonglong_type,
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.c_longdouble_type,
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.f16_type,
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.f32_type,
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.f64_type,
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.f128_type,
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.c_void_type,
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.bool_type,
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.void_type,
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.type_type,
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.anyerror_type,
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.comptime_int_type,
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.comptime_float_type,
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.noreturn_type,
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.fn_naked_noreturn_no_args_type,
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.single_const_pointer_to_comptime_int_type,
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.const_slice_u8_type,
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.void_value,
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.noreturn_value,
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.bool_true,
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.bool_false,
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.function,
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.ref,
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.ref_val,
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.bytes,
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=> unreachable,
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.zero => return 0,
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.int_u64 => return self.cast(Payload.Int_u64).?.int,
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.int_i64 => return @intCast(u64, self.cast(Payload.Int_u64).?.int),
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.int_big => return self.cast(Payload.IntBig).?.big_int.to(u64) catch unreachable,
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}
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}
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/// Asserts the value is an integer, and the destination type is ComptimeInt or Int.
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pub fn intFitsInType(self: Value, ty: Type, target: Target) bool {
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switch (self.tag()) {
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.ty,
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.u8_type,
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.i8_type,
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.isize_type,
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.usize_type,
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.c_short_type,
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.c_ushort_type,
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.c_int_type,
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.c_uint_type,
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.c_long_type,
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.c_ulong_type,
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.c_longlong_type,
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.c_ulonglong_type,
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.c_longdouble_type,
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.f16_type,
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.f32_type,
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.f64_type,
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.f128_type,
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.c_void_type,
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.bool_type,
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.void_type,
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.type_type,
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.anyerror_type,
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.comptime_int_type,
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.comptime_float_type,
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.noreturn_type,
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.fn_naked_noreturn_no_args_type,
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.single_const_pointer_to_comptime_int_type,
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.const_slice_u8_type,
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.void_value,
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.noreturn_value,
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.bool_true,
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.bool_false,
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.function,
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.ref,
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.ref_val,
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.bytes,
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=> unreachable,
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.zero => return true,
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.int_u64 => switch (ty.zigTypeTag()) {
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.Int => {
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const x = self.cast(Payload.Int_u64).?.int;
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if (x == 0) return true;
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const info = ty.intInfo(target);
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const needed_bits = std.math.log2(x) + 1 + @boolToInt(info.signed);
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return info.bits >= needed_bits;
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},
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.ComptimeInt => return true,
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else => unreachable,
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},
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.int_i64 => switch (ty.zigTypeTag()) {
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.Int => {
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const x = self.cast(Payload.Int_i64).?.int;
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if (x == 0) return true;
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const info = ty.intInfo(target);
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if (!info.signed and x < 0)
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return false;
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@panic("TODO implement i64 intFitsInType");
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},
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.ComptimeInt => return true,
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else => unreachable,
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},
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.int_big => switch (ty.zigTypeTag()) {
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.Int => {
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const info = ty.intInfo(target);
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return self.cast(Payload.IntBig).?.big_int.fitsInTwosComp(info.signed, info.bits);
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},
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.ComptimeInt => return true,
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else => unreachable,
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},
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}
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}
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/// Asserts the value is a pointer and dereferences it.
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pub fn pointerDeref(self: Value) Value {
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switch (self.tag()) {
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.ty,
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.u8_type,
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.i8_type,
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.isize_type,
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.usize_type,
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.c_short_type,
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.c_ushort_type,
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.c_int_type,
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.c_uint_type,
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.c_long_type,
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.c_ulong_type,
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.c_longlong_type,
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.c_ulonglong_type,
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.c_longdouble_type,
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.f16_type,
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.f32_type,
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.f64_type,
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.f128_type,
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.c_void_type,
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.bool_type,
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.void_type,
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.type_type,
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.anyerror_type,
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.comptime_int_type,
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.comptime_float_type,
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.noreturn_type,
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.fn_naked_noreturn_no_args_type,
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.single_const_pointer_to_comptime_int_type,
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.const_slice_u8_type,
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.zero,
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.void_value,
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.noreturn_value,
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.bool_true,
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.bool_false,
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.function,
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.int_u64,
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.int_i64,
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.int_big,
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.bytes,
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=> unreachable,
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.ref => return self.cast(Payload.Ref).?.cell.contents,
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.ref_val => return self.cast(Payload.RefVal).?.val,
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}
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}
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/// This type is not copyable since it may contain pointers to its inner data.
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pub const Payload = struct {
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tag: Tag,
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pub const Int_u64 = struct {
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base: Payload = Payload{ .tag = .int_u64 },
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int: u64,
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};
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pub const Int_i64 = struct {
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base: Payload = Payload{ .tag = .int_i64 },
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int: i64,
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};
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pub const IntBig = struct {
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base: Payload = Payload{ .tag = .int_big },
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big_int: BigInt,
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};
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pub const Function = struct {
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base: Payload = Payload{ .tag = .function },
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/// Index into the `fns` array of the `ir.Module`
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index: usize,
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};
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pub const ArraySentinel0_u8_Type = struct {
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base: Payload = Payload{ .tag = .array_sentinel_0_u8_type },
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len: u64,
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};
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pub const SingleConstPtrType = struct {
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base: Payload = Payload{ .tag = .single_const_ptr_type },
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elem_type: *Type,
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};
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pub const Ref = struct {
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base: Payload = Payload{ .tag = .ref },
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cell: *MemoryCell,
|
|
};
|
|
|
|
pub const RefVal = struct {
|
|
base: Payload = Payload{ .tag = .ref_val },
|
|
val: Value,
|
|
};
|
|
|
|
pub const Bytes = struct {
|
|
base: Payload = Payload{ .tag = .bytes },
|
|
data: []const u8,
|
|
};
|
|
|
|
pub const Ty = struct {
|
|
base: Payload = Payload{ .tag = .ty },
|
|
ty: Type,
|
|
};
|
|
};
|
|
};
|
|
|
|
/// This is the heart of resource management of the Zig compiler. The Zig compiler uses
|
|
/// stop-the-world mark-and-sweep garbage collection during compilation to manage the resources
|
|
/// associated with evaluating compile-time code and semantic analysis. Each `MemoryCell` represents
|
|
/// a root.
|
|
pub const MemoryCell = struct {
|
|
parent: Parent,
|
|
contents: Value,
|
|
|
|
pub const Parent = union(enum) {
|
|
none,
|
|
struct_field: struct {
|
|
struct_base: *MemoryCell,
|
|
field_index: usize,
|
|
},
|
|
array_elem: struct {
|
|
array_base: *MemoryCell,
|
|
elem_index: usize,
|
|
},
|
|
union_field: *MemoryCell,
|
|
err_union_code: *MemoryCell,
|
|
err_union_payload: *MemoryCell,
|
|
optional_payload: *MemoryCell,
|
|
optional_flag: *MemoryCell,
|
|
};
|
|
};
|