zls/src/ComptimeInterpreter.zig
2023-01-20 19:55:26 +01:00

1025 lines
40 KiB
Zig

//! Hacky comptime interpreter, courtesy of midnight code run fuelled by spite;
//! hope that one day this can use async... <33
// TODO: DODify
const std = @import("std");
const builtin = @import("builtin");
const ast = @import("ast.zig");
const zig = std.zig;
const Ast = zig.Ast;
const analysis = @import("analysis.zig");
const offsets = @import("offsets.zig");
const DocumentStore = @import("DocumentStore.zig");
pub const InternPool = @import("InternPool.zig");
pub const IPIndex = InternPool.Index;
pub const IPKey = InternPool.Key;
pub const ComptimeInterpreter = @This();
const log = std.log.scoped(.comptime_interpreter);
allocator: std.mem.Allocator,
ip: InternPool = .{},
document_store: *DocumentStore,
uri: DocumentStore.Uri,
decls: std.ArrayListUnmanaged(Decl) = .{},
namespaces: std.MultiArrayList(Namespace) = .{},
/// Interpreter diagnostic errors
errors: std.AutoArrayHashMapUnmanaged(Ast.Node.Index, InterpreterError) = .{},
pub fn getHandle(interpreter: *ComptimeInterpreter) *const DocumentStore.Handle {
// This interpreter is loaded from a known-valid handle so a valid handle must exist
return interpreter.document_store.getOrLoadHandle(interpreter.uri).?;
}
pub const InterpreterError = struct {
code: []const u8,
message: []const u8,
};
/// `message` must be allocated with interpreter allocator
pub fn recordError(
interpreter: *ComptimeInterpreter,
node_idx: Ast.Node.Index,
code: []const u8,
comptime fmt: []const u8,
args: anytype,
) error{OutOfMemory}!void {
try interpreter.errors.put(interpreter.allocator, node_idx, .{
.code = code,
.message = try std.fmt.allocPrint(interpreter.allocator, fmt, args),
});
}
pub fn deinit(interpreter: *ComptimeInterpreter) void {
var err_it = interpreter.errors.iterator();
while (err_it.next()) |entry| interpreter.allocator.free(entry.value_ptr.message);
interpreter.errors.deinit(interpreter.allocator);
interpreter.ip.deinit(interpreter.allocator);
var i: usize = 0;
while (i < interpreter.namespaces.len) : (i += 1) {
interpreter.namespaces.items(.decls)[i].deinit(interpreter.allocator);
interpreter.namespaces.items(.usingnamespaces)[i].deinit(interpreter.allocator);
}
interpreter.namespaces.deinit(interpreter.allocator);
interpreter.decls.deinit(interpreter.allocator);
}
pub const Type = struct {
interpreter: *ComptimeInterpreter,
node_idx: Ast.Node.Index,
ty: IPIndex,
};
pub const Value = struct {
interpreter: *ComptimeInterpreter,
node_idx: Ast.Node.Index,
ty: IPIndex,
val: IPIndex,
};
pub const Decl = struct {
name: []const u8,
ty: IPIndex,
val: IPIndex,
alignment: u16,
address_space: std.builtin.AddressSpace,
is_pub: bool,
is_exported: bool,
};
// pub const Comptimeness = enum { @"comptime", runtime };
pub const NamespaceIndex = InternPool.NamespaceIndex;
pub const Namespace = struct {
/// always points to Namespace or Index.none
parent: NamespaceIndex,
node_idx: Ast.Node.Index,
/// Will be a struct, enum, union, opaque or .none
ty: IPIndex,
decls: std.StringArrayHashMapUnmanaged(Decl) = .{},
usingnamespaces: std.ArrayListUnmanaged(NamespaceIndex) = .{},
// TODO: Actually use this value
// comptimeness: Comptimeness,
pub fn getLabel(self: Namespace, tree: Ast) ?Ast.TokenIndex {
const token_tags = tree.tokens.items(.tag);
switch (tree.nodes.items(.tag)[self.node_idx]) {
.block_two,
.block_two_semicolon,
.block,
.block_semicolon,
=> {
const lbrace = tree.nodes.items(.main_token)[self.node_idx];
if (token_tags[lbrace - 1] == .colon and token_tags[lbrace - 2] == .identifier) {
return lbrace - 2;
}
return null;
},
else => return null,
}
}
};
pub const InterpretResult = union(enum) {
@"break": ?[]const u8,
break_with_value: struct {
label: ?[]const u8,
value: Value,
},
value: Value,
@"return",
return_with_value: Value,
nothing,
pub fn maybeGetValue(result: InterpretResult) ?Value {
return switch (result) {
.break_with_value => |v| v.value,
.value => |v| v,
.return_with_value => |v| v,
else => null,
};
}
pub fn getValue(result: InterpretResult) error{ExpectedValue}!Value {
return result.maybeGetValue() orelse error.ExpectedValue;
}
};
pub fn huntItDown(
interpreter: *ComptimeInterpreter,
namespace: NamespaceIndex,
decl_name: []const u8,
options: InterpretOptions,
) error{IdentifierNotFound}!Decl {
_ = options;
var current_namespace = namespace;
while (current_namespace != .none) {
const decls: std.StringArrayHashMapUnmanaged(Decl) = interpreter.namespaces.items(.decls)[@enumToInt(current_namespace)];
defer current_namespace = interpreter.namespaces.items(.parent)[@enumToInt(current_namespace)];
if (decls.get(decl_name)) |decl| {
return decl;
}
}
return error.IdentifierNotFound;
}
// Might be useful in the future
pub const InterpretOptions = struct {};
pub const InterpretError = std.mem.Allocator.Error || std.fmt.ParseIntError || std.fmt.ParseFloatError || error{
InvalidCharacter,
InvalidBase,
ExpectedValue,
InvalidOperation,
CriticalAstFailure,
InvalidBuiltin,
IdentifierNotFound,
MissingArguments,
ImportFailure,
InvalidCast,
};
pub fn interpret(
interpreter: *ComptimeInterpreter,
node_idx: Ast.Node.Index,
namespace: NamespaceIndex,
options: InterpretOptions,
) InterpretError!InterpretResult {
const tree = interpreter.getHandle().tree;
const tags = tree.nodes.items(.tag);
const data = tree.nodes.items(.data);
const main_tokens = tree.nodes.items(.main_token);
switch (tags[node_idx]) {
.container_decl,
.container_decl_trailing,
.container_decl_arg,
.container_decl_arg_trailing,
.container_decl_two,
.container_decl_two_trailing,
// .tagged_union, // TODO: Fix these
// .tagged_union_trailing,
// .tagged_union_two,
// .tagged_union_two_trailing,
// .tagged_union_enum_tag,
// .tagged_union_enum_tag_trailing,
.root,
=> {
const type_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type });
try interpreter.namespaces.append(interpreter.allocator, .{
.parent = namespace,
.node_idx = node_idx,
.ty = undefined,
});
const container_namespace = @intToEnum(NamespaceIndex, interpreter.namespaces.len - 1);
var fields = std.ArrayListUnmanaged(InternPool.Struct.Field){};
defer fields.deinit(interpreter.allocator);
var buffer: [2]Ast.Node.Index = undefined;
const members = ast.declMembers(tree, node_idx, &buffer);
for (members) |member| {
const container_field = ast.containerField(tree, member) orelse {
_ = try interpreter.interpret(member, container_namespace, options);
continue;
};
var init_type_value = try (try interpreter.interpret(container_field.ast.type_expr, container_namespace, .{})).getValue();
var default_value = if (container_field.ast.value_expr == 0)
IPIndex.none
else
(try (try interpreter.interpret(container_field.ast.value_expr, container_namespace, .{})).getValue()).val; // TODO check ty
if (init_type_value.ty != type_type) {
try interpreter.recordError(
container_field.ast.type_expr,
"expected_type",
"expected type 'type', found '{}'",
.{init_type_value.ty.fmtType(interpreter.ip)},
);
continue;
}
const field: InternPool.Struct.Field = .{
.name = tree.tokenSlice(container_field.ast.main_token),
.ty = init_type_value.val,
.default_value = default_value,
.alignment = 0, // TODO,
.is_comptime = false, // TODO
};
try fields.append(interpreter.allocator, field);
}
const struct_type = try interpreter.ip.get(interpreter.allocator, IPKey{
.struct_type = .{
.fields = fields.items,
.namespace = namespace,
.layout = .Auto, // TODO
.backing_int_ty = .none, // TODO
},
});
interpreter.namespaces.items(.ty)[@enumToInt(container_namespace)] = struct_type;
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = type_type,
.val = struct_type,
} };
},
.error_set_decl => {
// TODO
return InterpretResult{ .nothing = {} };
},
.global_var_decl,
.local_var_decl,
.aligned_var_decl,
.simple_var_decl,
=> {
var decls = &interpreter.namespaces.items(.decls)[@enumToInt(namespace)];
const name = analysis.getDeclName(tree, node_idx).?;
if (decls.contains(name))
return InterpretResult{ .nothing = {} };
const decl = ast.varDecl(tree, node_idx).?;
if (decl.ast.init_node == 0)
return InterpretResult{ .nothing = {} };
const init_type_value = try ((try interpreter.interpret(decl.ast.init_node, namespace, .{})).getValue());
try decls.putNoClobber(interpreter.allocator, name, .{
.name = name,
.ty = init_type_value.ty,
.val = init_type_value.val,
.alignment = 0, // TODO
.address_space = .generic, // TODO
.is_pub = true, // TODO
.is_exported = false, // TODO
});
// TODO: Am I a dumbo shrimp? (e.g. is this tree shaking correct? works on my machine so like...)
// if (scope.?.scopeKind() != .container) {
// if (scope.?.node_idx != 0)
// _ = try decls.getPtr(name).?.getValue();
return InterpretResult{ .nothing = {} };
},
.block,
.block_semicolon,
.block_two,
.block_two_semicolon,
=> {
try interpreter.namespaces.append(interpreter.allocator, .{
.parent = namespace,
.node_idx = node_idx,
.ty = .none,
});
const block_namespace = @intToEnum(NamespaceIndex, interpreter.namespaces.len - 1);
var buffer: [2]Ast.Node.Index = undefined;
const statements = ast.blockStatements(tree, node_idx, &buffer).?;
for (statements) |idx| {
const ret = try interpreter.interpret(idx, block_namespace, options);
switch (ret) {
.@"break" => |lllll| {
const maybe_block_label_string = if (interpreter.namespaces.get(@enumToInt(namespace)).getLabel(tree)) |i| tree.tokenSlice(i) else null;
if (lllll) |l| {
if (maybe_block_label_string) |ls| {
if (std.mem.eql(u8, l, ls)) {
return InterpretResult{ .nothing = {} };
} else return ret;
} else return ret;
} else {
return InterpretResult{ .nothing = {} };
}
},
.break_with_value => |bwv| {
const maybe_block_label_string = if (interpreter.namespaces.get(@enumToInt(namespace)).getLabel(tree)) |i| tree.tokenSlice(i) else null;
if (bwv.label) |l| {
if (maybe_block_label_string) |ls| {
if (std.mem.eql(u8, l, ls)) {
return InterpretResult{ .value = bwv.value };
} else return ret;
} else return ret;
} else {
return InterpretResult{ .value = bwv.value };
}
},
.@"return", .return_with_value => return ret,
else => {},
}
}
return InterpretResult{ .nothing = {} };
},
.identifier => {
const value = offsets.nodeToSlice(tree, node_idx);
const simples = std.ComptimeStringMap(InternPool.Simple, .{
.{ "anyerror", .anyerror },
.{ "anyframe", .@"anyframe" },
.{ "anyopaque", .anyopaque },
.{ "bool", .bool },
.{ "c_int", .c_int },
.{ "c_long", .c_long },
.{ "c_longdouble", .c_longdouble },
.{ "c_longlong", .c_longlong },
.{ "c_short", .c_short },
.{ "c_uint", .c_uint },
.{ "c_ulong", .c_ulong },
.{ "c_ulonglong", .c_ulonglong },
.{ "c_ushort", .c_ushort },
.{ "comptime_float", .comptime_float },
.{ "comptime_int", .comptime_int },
.{ "f128", .f128 },
.{ "f16", .f16 },
.{ "f32", .f32 },
.{ "f64", .f64 },
.{ "f80", .f80 },
.{ "false", .bool_false },
.{ "isize", .isize },
.{ "noreturn", .noreturn },
.{ "null", .null_value },
.{ "true", .bool_true },
.{ "type", .type },
.{ "undefined", .undefined_value },
.{ "usize", .usize },
.{ "void", .void },
});
if (simples.get(value)) |simple| {
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = simple.toType() }),
.val = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = simple }),
} };
}
if (value.len >= 2 and (value[0] == 'u' or value[0] == 'i')) blk: {
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type }),
.val = try interpreter.ip.get(interpreter.allocator, IPKey{ .int_type = .{
.signedness = if (value[0] == 'u') .unsigned else .signed,
.bits = std.fmt.parseInt(u16, value[1..], 10) catch break :blk,
} }),
} };
}
// Logic to find identifiers in accessible scopes
const decl = interpreter.huntItDown(namespace, value, options) catch |err| switch (err) {
error.IdentifierNotFound => |e| {
try interpreter.recordError(
node_idx,
"undeclared_identifier",
"use of undeclared identifier '{s}'",
.{value},
);
return e;
},
};
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = decl.ty,
.val = decl.val,
} };
},
.field_access => {
if (data[node_idx].rhs == 0) return error.CriticalAstFailure;
const rhs_str = tree.tokenSlice(data[node_idx].rhs);
var ir = try interpreter.interpret(data[node_idx].lhs, namespace, options);
var irv = try ir.getValue();
const lhs_namespace = interpreter.ip.indexToKey(irv.val).getNamespace();
var scope_sub_decl = irv.interpreter.huntItDown(lhs_namespace, rhs_str, options) catch |err| switch (err) {
error.IdentifierNotFound => |e| {
try interpreter.recordError(
node_idx,
"undeclared_identifier",
"`{}` has no member '{s}'",
.{ irv.ty.fmtType(interpreter.ip), rhs_str },
);
return e;
},
};
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = data[node_idx].rhs,
.ty = scope_sub_decl.ty,
.val = scope_sub_decl.val,
} };
},
.grouped_expression => {
return try interpreter.interpret(data[node_idx].lhs, namespace, options);
},
.@"break" => {
const label = if (data[node_idx].lhs == 0) null else tree.tokenSlice(data[node_idx].lhs);
return if (data[node_idx].rhs == 0)
InterpretResult{ .@"break" = label }
else
InterpretResult{ .break_with_value = .{ .label = label, .value = try (try interpreter.interpret(data[node_idx].rhs, namespace, options)).getValue() } };
},
.@"return" => {
return if (data[node_idx].lhs == 0)
InterpretResult{ .@"return" = {} }
else
InterpretResult{ .return_with_value = try (try interpreter.interpret(data[node_idx].lhs, namespace, options)).getValue() };
},
.@"if",
.if_simple,
=> {
const if_info = ast.ifFull(tree, node_idx);
// TODO: Don't evaluate runtime ifs
// if (options.observe_values) {
const ir = try interpreter.interpret(if_info.ast.cond_expr, namespace, options);
const false_value = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool_false });
const true_value = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool_true });
const condition = (try ir.getValue()).val;
std.debug.assert(condition == false_value or condition == true_value);
if (condition == true_value) {
return try interpreter.interpret(if_info.ast.then_expr, namespace, options);
} else {
if (if_info.ast.else_expr != 0) {
return try interpreter.interpret(if_info.ast.else_expr, namespace, options);
} else return InterpretResult{ .nothing = {} };
}
},
.equal_equal => {
var a = try interpreter.interpret(data[node_idx].lhs, namespace, options);
var b = try interpreter.interpret(data[node_idx].rhs, namespace, options);
return InterpretResult{
.value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool }),
.val = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = if (a.value.val == b.value.val) .bool_true else .bool_false }), // TODO eql function required?
},
};
},
.number_literal => {
const s = tree.getNodeSource(node_idx);
const nl = std.zig.parseNumberLiteral(s);
if (nl == .failure) return error.CriticalAstFailure;
const number_type = try interpreter.ip.get(interpreter.allocator, IPKey{
.simple = if (nl == .float) .comptime_float else .comptime_int,
});
const value = try interpreter.ip.get(
interpreter.allocator,
switch (nl) {
.float => IPKey{
.float_128_value = try std.fmt.parseFloat(f128, s),
},
.int => if (s[0] == '-') IPKey{
.int_i64_value = try std.fmt.parseInt(i64, s, 0),
} else IPKey{
.int_u64_value = try std.fmt.parseInt(u64, s, 0),
},
.big_int => @panic("TODO: implement big int"),
.failure => return error.CriticalAstFailure,
},
);
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = number_type,
.val = value,
} };
},
.assign,
.assign_bit_and,
.assign_bit_or,
.assign_shl,
.assign_shr,
.assign_bit_xor,
.assign_div,
.assign_sub,
.assign_sub_wrap,
.assign_mod,
.assign_add,
.assign_add_wrap,
.assign_mul,
.assign_mul_wrap,
=> {
// TODO: Actually consider operators
if (std.mem.eql(u8, tree.getNodeSource(data[node_idx].lhs), "_")) {
_ = try interpreter.interpret(data[node_idx].rhs, namespace, options);
return InterpretResult{ .nothing = {} };
}
var ir = try interpreter.interpret(data[node_idx].lhs, namespace, options);
var to_value = try ir.getValue();
var from_value = (try (try interpreter.interpret(data[node_idx].rhs, namespace, options)).getValue());
// TODO report error
_ = try interpreter.ip.cast(interpreter.allocator, to_value.ty, from_value.ty, builtin.target);
return InterpretResult{ .nothing = {} };
},
// .@"switch",
// .switch_comma,
// => {
// const cond = data[node_idx].lhs;
// const extra = tree.extraData(data[node_idx].rhs, Ast.Node.SubRange);
// const cases = tree.extra_data[extra.start..extra.end];
// for (cases) |case| {
// const switch_case: Ast.full.SwitchCase = switch (tags[case]) {
// .switch_case => tree.switchCase(case),
// .switch_case_one => tree.switchCaseOne(case),
// else => continue,
// };
// }
// },
.builtin_call,
.builtin_call_comma,
.builtin_call_two,
.builtin_call_two_comma,
=> {
var buffer: [2]Ast.Node.Index = undefined;
const params = ast.builtinCallParams(tree, node_idx, &buffer).?;
const call_name = tree.tokenSlice(main_tokens[node_idx]);
if (std.mem.eql(u8, call_name, "@compileLog")) {
var final = std.ArrayList(u8).init(interpreter.allocator);
var writer = final.writer();
try writer.writeAll("log: ");
for (params) |param, index| {
var value = (try interpreter.interpret(param, namespace, options)).maybeGetValue() orelse {
try writer.writeAll("indeterminate");
continue;
};
try writer.print("@as({}, {})", .{ value.ty.fmtType(interpreter.ip), value.val.fmtValue(value.ty, interpreter.ip) });
if (index != params.len - 1)
try writer.writeAll(", ");
}
try interpreter.recordError(node_idx, "compile_log", "{s}", .{try final.toOwnedSlice()});
return InterpretResult{ .nothing = {} };
}
if (std.mem.eql(u8, call_name, "@compileError")) {
if (params.len != 0) return error.InvalidBuiltin;
const message = offsets.nodeToSlice(tree, params[0]);
try interpreter.recordError(node_idx, "compile_error", "{s}", .{message});
return InterpretResult{ .@"return" = {} };
}
if (std.mem.eql(u8, call_name, "@import")) {
if (params.len == 0) return error.InvalidBuiltin;
const import_param = params[0];
if (tags[import_param] != .string_literal) return error.InvalidBuiltin;
const import_str = tree.tokenSlice(main_tokens[import_param]);
log.info("Resolving {s} from {s}", .{ import_str[1 .. import_str.len - 1], interpreter.uri });
// TODO: Implement root support
if (std.mem.eql(u8, import_str[1 .. import_str.len - 1], "root")) {
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .struct_type = .{
.fields = &.{},
.namespace = .none,
.layout = .Auto,
.backing_int_ty = .none,
} }),
.val = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .undefined_value }),
} };
}
var import_uri = (try interpreter.document_store.uriFromImportStr(interpreter.allocator, interpreter.getHandle().*, import_str[1 .. import_str.len - 1])) orelse return error.ImportFailure;
defer interpreter.allocator.free(import_uri);
var handle = interpreter.document_store.getOrLoadHandle(import_uri) orelse return error.ImportFailure;
try interpreter.document_store.ensureInterpreterExists(handle.uri);
return InterpretResult{
.value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type }),
.val = .none, // TODO
},
};
}
if (std.mem.eql(u8, call_name, "@TypeOf")) {
if (params.len != 1) return error.InvalidBuiltin;
const value = try (try interpreter.interpret(params[0], namespace, options)).getValue();
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type }),
.val = value.ty,
} };
}
if (std.mem.eql(u8, call_name, "@hasDecl")) {
if (params.len != 2) return error.InvalidBuiltin;
const value = try (try interpreter.interpret(params[0], namespace, options)).getValue();
const field_name = try (try interpreter.interpret(params[1], namespace, options)).getValue();
const type_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type });
if (value.ty != type_type) return error.InvalidBuiltin;
if (interpreter.ip.indexToKey(field_name.ty) != .pointer_type) return error.InvalidBuiltin; // Check if it's a []const u8
const value_namespace = interpreter.ip.indexToKey(value.val).getNamespace();
if (value_namespace == .none) return error.InvalidBuiltin;
const name = interpreter.ip.indexToKey(field_name.val).bytes; // TODO add checks
const decls = interpreter.namespaces.items(.decls)[@enumToInt(value_namespace)];
const has_decl = decls.contains(name);
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool }),
.val = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = if (has_decl) .bool_true else .bool_false }),
} };
}
if (std.mem.eql(u8, call_name, "@as")) {
if (params.len != 2) return error.InvalidBuiltin;
const as_type = try (try interpreter.interpret(params[0], namespace, options)).getValue();
const value = try (try interpreter.interpret(params[1], namespace, options)).getValue();
const type_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type });
if (as_type.ty != type_type) return error.InvalidBuiltin;
return InterpretResult{
.value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = as_type.val,
.val = value.val, // TODO port Sema.coerceExtra to InternPool
},
};
}
log.err("Builtin not implemented: {s}", .{call_name});
return error.InvalidBuiltin;
},
.string_literal => {
const str = tree.getNodeSource(node_idx)[1 .. tree.getNodeSource(node_idx).len - 1];
const string_literal_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .pointer_type = .{
.elem_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .array_type = .{
.child = try interpreter.ip.get(interpreter.allocator, IPKey{ .int_type = .{
.signedness = .unsigned,
.bits = 8,
} }),
.len = @intCast(u32, str.len),
.sentinel = try interpreter.ip.get(interpreter.allocator, IPKey{ .int_u64_value = 0 }),
} }),
.sentinel = .none,
.alignment = 0,
.size = .One,
.is_const = true,
.is_volatile = false,
.is_allowzero = false,
.address_space = .generic,
} });
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = string_literal_type,
.val = try interpreter.ip.get(interpreter.allocator, IPKey{ .bytes = str }),
} };
},
// TODO: Add comptime autodetection; e.g. const MyArrayList = std.ArrayList(u8)
.@"comptime" => {
return try interpreter.interpret(data[node_idx].lhs, namespace, .{});
},
.fn_proto,
.fn_proto_multi,
.fn_proto_one,
.fn_proto_simple,
.fn_decl,
=> {
var buf: [1]Ast.Node.Index = undefined;
const func = ast.fnProto(tree, node_idx, &buf).?;
// TODO: Resolve function type
const type_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type });
const function_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .function_type = .{
.calling_convention = .Unspecified,
.alignment = 0,
.is_generic = false,
.is_var_args = false,
.return_type = IPIndex.none,
.args = &.{},
} });
// var it = func.iterate(&tree);
// while (ast.nextFnParam(&it)) |param| {
// // Add parameter decls
// if (param.name_token) |name_token| {
// // TODO: Think of new method for functions
// if ((try interpreter.interpret(param.type_expr, func_scope_idx, .{ .observe_values = true, .is_comptime = true })).maybeGetValue()) |value| {
// try interpreter.addDeclaration(func_scope_idx, value.value_data.@"type");
// try fnd.params.append(interpreter.allocator, interpreter.declarations.items.len - 1);
// } else {
// try interpreter.addDeclaration(parent_scope_idx.?, .{
// .node_idx = node_idx,
// .name = tree.tokenSlice(name_token),
// .scope_idx = func_scope_idx, // orelse std.math.maxInt(usize),
// .@"value" = undefined,
// .@"type" = interpreter.createType(0, .{ .@"anytype" = .{} }),
// });
// try fnd.params.append(interpreter.allocator, interpreter.declarations.items.len - 1);
// }
// }
// }
// if ((try interpreter.interpret(func.ast.return_type, func_scope_idx, .{ .observe_values = true, .is_comptime = true })).maybeGetValue()) |value|
// fnd.return_type = value.value_data.@"type";
const name = offsets.tokenToSlice(tree, func.name_token.?);
if (namespace != .none) {
const decls = &interpreter.namespaces.items(.decls)[@enumToInt(namespace)];
try decls.put(interpreter.allocator, name, .{
.name = name,
.ty = type_type,
.val = function_type,
.alignment = 0, // TODO
.address_space = .generic, // TODO
.is_pub = false, // TODO
.is_exported = false, // TODO
});
}
return InterpretResult{ .nothing = {} };
},
.call,
.call_comma,
.async_call,
.async_call_comma,
.call_one,
.call_one_comma,
.async_call_one,
.async_call_one_comma,
=> {
var params: [1]Ast.Node.Index = undefined;
const call_full = ast.callFull(tree, node_idx, &params).?;
var args = try std.ArrayListUnmanaged(Value).initCapacity(interpreter.allocator, call_full.ast.params.len);
defer args.deinit(interpreter.allocator);
for (call_full.ast.params) |param| {
args.appendAssumeCapacity(try (try interpreter.interpret(param, namespace, .{})).getValue());
}
const func_id_result = try interpreter.interpret(call_full.ast.fn_expr, namespace, .{});
const func_id_val = try func_id_result.getValue();
const call_res = try interpreter.call(namespace, func_id_val.node_idx, args.items, options);
// TODO: Figure out call result memory model; this is actually fine because newScope
// makes this a child of the decl scope which is freed on refresh... in theory
return switch (call_res.result) {
.value => |v| .{ .value = v },
.nothing => .{ .nothing = {} },
};
},
.bool_not => {
const result = try interpreter.interpret(data[node_idx].lhs, namespace, .{});
const bool_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool });
const value = try result.getValue();
if (value.ty != bool_type) {
try interpreter.recordError(
node_idx,
"invalid_deref",
"expected type `bool` but got `{}`",
.{value.ty.fmtType(interpreter.ip)},
);
return error.InvalidOperation;
}
const false_value = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool_false });
const true_value = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .bool_true });
std.debug.assert(value.val == false_value or value.val == true_value);
return InterpretResult{ .value = .{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = bool_type,
.val = if (value.val == false_value) true_value else false_value,
} };
},
.address_of => {
// TODO: Make const pointers if we're drawing from a const;
// variables are the only non-const(?)
const result = try interpreter.interpret(data[node_idx].lhs, namespace, .{});
const value = (try result.getValue());
const pointer_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .pointer_type = .{
.elem_type = value.ty,
.sentinel = .none,
.alignment = 0,
.size = .One,
.is_const = false,
.is_volatile = false,
.is_allowzero = false,
.address_space = .generic,
} });
return InterpretResult{ .value = .{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = pointer_type,
.val = value.val,
} };
},
.deref => {
const result = try interpreter.interpret(data[node_idx].lhs, namespace, .{});
const value = (try result.getValue());
const type_key = interpreter.ip.indexToKey(value.ty);
if (type_key != .pointer_type) {
try interpreter.recordError(node_idx, "invalid_deref", "cannot deference non-pointer", .{});
return error.InvalidOperation;
}
return InterpretResult{ .value = .{
.interpreter = interpreter,
.node_idx = node_idx,
.ty = type_key.pointer_type.elem_type,
.val = value.val,
} };
},
else => {
log.err("Unhandled {any}", .{tags[node_idx]});
return InterpretResult{ .nothing = {} };
},
}
}
pub const CallResult = struct {
namespace: NamespaceIndex,
result: union(enum) {
value: Value,
nothing,
},
};
pub fn call(
interpreter: *ComptimeInterpreter,
namespace: NamespaceIndex,
func_node_idx: Ast.Node.Index,
arguments: []const Value,
options: InterpretOptions,
) InterpretError!CallResult {
// _ = options;
// TODO: type check args
const tree = interpreter.getHandle().tree;
var buf: [1]Ast.Node.Index = undefined;
var proto = ast.fnProto(tree, func_node_idx, &buf) orelse return error.CriticalAstFailure;
// TODO: Make argument namespace to evaluate arguments in
try interpreter.namespaces.append(interpreter.allocator, .{
.parent = namespace,
.node_idx = func_node_idx,
.ty = .none,
});
const fn_namespace = @intToEnum(NamespaceIndex, interpreter.namespaces.len - 1);
const type_type = try interpreter.ip.get(interpreter.allocator, IPKey{ .simple = .type });
var arg_it = proto.iterate(&tree);
var arg_index: usize = 0;
while (ast.nextFnParam(&arg_it)) |param| {
if (arg_index >= arguments.len) return error.MissingArguments;
var tex = try (try interpreter.interpret(param.type_expr, fn_namespace, options)).getValue();
if (tex.ty != type_type) {
try interpreter.recordError(
param.type_expr,
"expected_type",
"expected type 'type', found '{}'",
.{tex.ty.fmtType(interpreter.ip)},
);
return error.InvalidCast;
}
if (param.name_token) |name_token| {
const name = offsets.tokenToSlice(tree, name_token);
try interpreter.namespaces.items(.decls)[@enumToInt(fn_namespace)].put(interpreter.allocator, name, .{
.name = name,
.ty = tex.val,
.val = arguments[arg_index].val,
.alignment = 0, // TODO
.address_space = .generic, // TODO
.is_pub = true, // TODO
.is_exported = false, // TODO
});
arg_index += 1;
}
}
const body = tree.nodes.items(.data)[func_node_idx].rhs;
const result = try interpreter.interpret(body, fn_namespace, .{});
// TODO: Defers
return CallResult{
.namespace = fn_namespace,
.result = switch (result) {
.@"return", .nothing => .{ .nothing = {} }, // nothing could be due to an error
.return_with_value => |v| .{ .value = v },
else => @panic("bruh"),
},
};
}