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AstGen: implement alignment on locals

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This commit is contained in:
Andrew Kelley
2021-04-21 22:43:57 -07:00
parent ea00ddfe37
commit 389020009a
4 changed files with 139 additions and 16 deletions
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51
src/Module.zig
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@@ -1630,6 +1630,57 @@ pub const Scope = struct {
});
}
pub fn addAllocExtended(
gz: *GenZir,
args: struct {
/// Absolute node index. This function does the conversion to offset from Decl.
node: ast.Node.Index,
type_inst: Zir.Inst.Ref,
align_inst: Zir.Inst.Ref,
is_const: bool,
is_comptime: bool,
},
) !Zir.Inst.Ref {
const astgen = gz.astgen;
const gpa = astgen.gpa;
try gz.instructions.ensureUnusedCapacity(gpa, 1);
try astgen.instructions.ensureUnusedCapacity(gpa, 1);
try astgen.extra.ensureUnusedCapacity(
gpa,
@typeInfo(Zir.Inst.AllocExtended).Struct.fields.len +
@as(usize, @boolToInt(args.type_inst != .none)) +
@as(usize, @boolToInt(args.align_inst != .none)),
);
const payload_index = gz.astgen.addExtra(Zir.Inst.AllocExtended{
.src_node = gz.nodeIndexToRelative(args.node),
}) catch unreachable; // ensureUnusedCapacity above
if (args.type_inst != .none) {
astgen.extra.appendAssumeCapacity(@enumToInt(args.type_inst));
}
if (args.align_inst != .none) {
astgen.extra.appendAssumeCapacity(@enumToInt(args.align_inst));
}
const has_type: u4 = @boolToInt(args.type_inst != .none);
const has_align: u4 = @boolToInt(args.align_inst != .none);
const is_const: u4 = @boolToInt(args.is_const);
const is_comptime: u4 = @boolToInt(args.is_comptime);
const small: u16 = has_type | (has_align << 1) | (is_const << 2) | (is_comptime << 3);
const new_index = @intCast(Zir.Inst.Index, astgen.instructions.len);
astgen.instructions.appendAssumeCapacity(.{
.tag = .extended,
.data = .{ .extended = .{
.opcode = .alloc,
.small = small,
.operand = payload_index,
} },
});
gz.instructions.appendAssumeCapacity(new_index);
return gz.indexToRef(new_index);
}
/// Asserts that `str` is 8 or fewer bytes.
pub fn addSmallStr(
gz: *GenZir,