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spirv: initial decl_ref pointer generation

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Starts lowering decl_ref Pointer constants.
This commit is contained in:
Robin Voetter 2022-12-03 00:13:25 +01:00
parent c9db6e43af
commit fbe5f0c345
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GPG Key ID: E755662F227CB468
1 changed files with 25 additions and 5 deletions
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30
src/codegen/spirv.zig
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@ -373,15 +373,16 @@ pub const DeclGen = struct {
const ty = self.spv.typeRefType(ty_ref);
const ty_id = self.typeId(ty_ref);
const literal: spec.LiteralContextDependentNumber = switch (ty.intSignedness()) {
const Lit = spec.LiteralContextDependentNumber;
const literal = switch (ty.intSignedness()) {
.signed => switch (ty.intFloatBits()) {
1...32 => .{ .int32 = @intCast(i32, value) },
33...64 => .{ .int64 = @intCast(i64, value) },
1...32 => Lit{ .int32 = @intCast(i32, value) },
33...64 => Lit{ .int64 = @intCast(i64, value) },
else => unreachable, // TODO: composite integer literals
},
.unsigned => switch (ty.intFloatBits()) {
1...32 => .{ .uint32 = @intCast(u32, value) },
33...64 => .{ .uint64 = @intCast(u64, value) },
1...32 => Lit{ .uint32 = @intCast(u32, value) },
33...64 => Lit{ .uint64 = @intCast(u64, value) },
else => unreachable,
},
};
@ -552,6 +553,19 @@ pub const DeclGen = struct {
.constituents = constituents,
});
},
.Pointer => switch (val.tag()) {
.decl_ref => {
const decl_index = val.castTag(.decl_ref).?.data;
const decl_result_id = self.spv.allocId();
try self.genDeclRef(decl_result_id, decl_index);
try section.emit(self.spv.gpa, .OpVariable, .{
.id_result_type = result_ty_id,
.id_result = result_id,
.storage_class = spirvStorageClass(ty.ptrAddressSpace()),
});
},
else => return self.todo("constant pointer of value type {s}", .{@tagName(val.tag())}),
},
.Fn => switch (repr) {
.direct => unreachable,
.indirect => return self.todo("function pointers", .{}),
@ -561,6 +575,12 @@ pub const DeclGen = struct {
}
}
fn genDeclRef(self: *DeclGen, result_id: IdRef, decl_index: Decl.Index) Error!void {
const decl = self.module.declPtr(decl_index);
self.module.markDeclAlive(decl);
try self.genConstant(result_id, decl.ty, decl.val, .indirect);
}
/// Turn a Zig type into a SPIR-V Type, and return its type result-id.
fn resolveTypeId(self: *DeclGen, ty: Type) !IdResultType {
const type_ref = try self.resolveType(ty, .direct);