zls/src/ComptimeInterpreter.zig

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//! 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 ast = @import("ast.zig");
const zig = std.zig;
const Ast = zig.Ast;
const analysis = @import("analysis.zig");
const DocumentStore = @import("DocumentStore.zig");
const ComptimeInterpreter = @This();
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const log = std.log.scoped(.comptime_interpreter);
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// TODO: Investigate arena
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allocator: std.mem.Allocator,
document_store: *DocumentStore,
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uri: DocumentStore.Uri,
root_type: ?Type = null,
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/// Interpreter diagnostic errors
errors: std.AutoArrayHashMapUnmanaged(Ast.Node.Index, InterpreterError) = .{},
// TODO: Deduplicate typeinfo across different interpreters
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type_info: std.ArrayListUnmanaged(TypeInfo) = .{},
type_info_map: std.HashMapUnmanaged(TypeInfo, usize, TypeInfo.Context, std.hash_map.default_max_load_percentage) = .{},
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// TODO: Use DOD
value_data_list: std.ArrayListUnmanaged(*ValueData) = .{},
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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,
};
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/// `message` must be allocated with interpreter allocator
pub fn recordError(interpreter: *ComptimeInterpreter, node_idx: Ast.Node.Index, code: []const u8, message: []const u8) error{OutOfMemory}!void {
try interpreter.errors.put(interpreter.allocator, node_idx, .{
.code = code,
.message = message,
});
}
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pub fn deinit(interpreter: *ComptimeInterpreter) void {
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var err_it = interpreter.errors.iterator();
while (err_it.next()) |entry| interpreter.allocator.free(entry.value_ptr.message);
if (interpreter.root_type) |rt| rt.getTypeInfo().getScopeOfType().?.deinit();
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for (interpreter.type_info.items) |*ti| ti.deinit(interpreter.allocator);
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for (interpreter.value_data_list.items) |ti| interpreter.allocator.destroy(ti);
interpreter.errors.deinit(interpreter.allocator);
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interpreter.type_info.deinit(interpreter.allocator);
interpreter.type_info_map.deinit(interpreter.allocator);
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interpreter.value_data_list.deinit(interpreter.allocator);
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}
pub const TypeInfo = union(enum) {
pub const Context = struct {
interpreter: ComptimeInterpreter,
hasher: *std.hash.Wyhash,
pub fn hash(self: @This(), s: TypeInfo) u64 {
TypeInfo.hash(self, s);
return self.hasher.final();
}
pub fn eql(self: @This(), a: TypeInfo, b: TypeInfo) bool {
_ = self;
return TypeInfo.eql(a, b);
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}
};
pub const Signedness = enum { signed, unsigned };
pub const Struct = struct {
/// Declarations contained within
scope: *InterpreterScope,
fields: std.StringHashMapUnmanaged(FieldDefinition) = .{},
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};
pub const Int = struct {
bits: u16,
signedness: Signedness,
};
pub const Pointer = struct {
size: Size,
is_const: bool,
is_volatile: bool,
child: Type,
is_allowzero: bool,
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sentinel: ?*ValueData,
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pub const Size = enum {
one,
many,
slice,
c,
};
};
pub const Fn = struct {
return_type: ?Type,
/// Index into interpreter.declarations
params: std.ArrayListUnmanaged(usize) = .{},
};
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pub const Array = struct {
len: usize,
child: Type,
sentinel: ?*ValueData,
};
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/// Hack to get anytype working; only valid on fnparams
@"anytype",
@"type",
@"bool",
@"struct": Struct,
pointer: Pointer,
@"fn": Fn,
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int: Int,
@"comptime_int",
float: u16,
@"comptime_float",
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array: Array,
pub fn eql(a: TypeInfo, b: TypeInfo) bool {
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if (std.meta.activeTag(a) != std.meta.activeTag(b)) return false;
return switch (a) {
.@"struct" => false, // Struct declarations can never be equal (this is a lie, gotta fix this)
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.pointer => p: {
const ap = a.pointer;
const bp = b.pointer;
break :p ap.size == bp.size and ap.is_const == bp.is_const and ap.is_volatile == bp.is_volatile and eql(
ap.child.getTypeInfo(),
bp.child.getTypeInfo(),
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) and ap.is_allowzero == bp.is_allowzero and ((ap.sentinel == null and bp.sentinel == null) or ((ap.sentinel != null and bp.sentinel != null) and ap.sentinel.?.eql(bp.sentinel.?)));
},
.int => a.int.signedness == b.int.signedness and a.int.bits == b.int.bits,
.float => a.float == b.float,
else => return true,
};
}
pub fn hash(context: TypeInfo.Context, ti: TypeInfo) void {
context.hasher.update(&[_]u8{@enumToInt(ti)});
return switch (ti) {
.@"struct" => |s| {
_ = s;
// TODO: Fix
// context.hasher.update(std.mem.sliceAsBytes(s.fields.items));
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// TODO: Fix
// context.hasher.update(std.mem.sliceAsBytes(s.declarations.items));
},
.pointer => |p| {
// const ap = a.pointer;
// const bp = b.pointer;
context.hasher.update(&[_]u8{ @enumToInt(p.size), @boolToInt(p.is_const), @boolToInt(p.is_volatile) });
TypeInfo.hash(context, p.child.getTypeInfo());
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context.hasher.update(&[_]u8{@boolToInt(p.is_allowzero)});
// TODO: Hash Sentinel
// break :p ap.size == bp.size and ap.is_const == bp.is_const and ap.is_volatile == bp.is_volatile and eql(
// source_unit,
// source_interpreter.type_info.items[ap.child.info_idx],
// source_interpreter.type_info.items[bp.child.info_idx],
// ) and ap.is_allowzero == bp.is_allowzero and ((ap.sentinel == null and bp.sentinel == null) or ((ap.sentinel != null and bp.sentinel != null) and ap.sentinel.?.eql(bp.sentinel.?)));
},
.int => |i| {
// a.int.signedness == b.int.signedness and a.int.bits == b.int.bits;
context.hasher.update(&[_]u8{@enumToInt(i.signedness)});
context.hasher.update(&std.mem.toBytes(i.bits));
},
.float => |f| context.hasher.update(&std.mem.toBytes(f)),
else => {},
};
}
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pub fn deinit(ti: *TypeInfo, allocator: std.mem.Allocator) void {
switch (ti.*) {
.@"struct" => |*s| s.fields.deinit(allocator),
else => {},
}
}
pub fn getScopeOfType(ti: TypeInfo) ?*InterpreterScope {
return switch (ti) {
.@"struct" => |s| s.scope,
else => null,
};
}
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};
pub const Type = struct {
interpreter: *ComptimeInterpreter,
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node_idx: Ast.Node.Index,
info_idx: usize,
pub fn getTypeInfo(@"type": Type) TypeInfo {
return @"type".interpreter.type_info.items[@"type".info_idx];
}
/// Be careful with this; typeinfo resizes reassign pointers!
pub fn getTypeInfoMutable(@"type": Type) *TypeInfo {
return &@"type".interpreter.type_info.items[@"type".info_idx];
}
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};
pub const Value = struct {
interpreter: *ComptimeInterpreter,
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node_idx: Ast.Node.Index,
@"type": Type,
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value_data: *ValueData,
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pub fn eql(value: Value, other_value: Value) bool {
return value.value_data.eql(other_value.value_data);
}
};
pub const ValueData = union(enum) {
// TODO: Support larger ints, floats; bigints?
@"type": Type,
@"bool": bool,
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@"struct": struct {},
/// This is what a pointer is; we don't need to map
/// this to anything because @ptrToInt is comptime-illegal
/// Pointer equality scares me though :( (but that's for later)
one_ptr: *ValueData,
/// Special case slice; this is extremely common at comptime so it makes sense
slice_of_const_u8: []const u8,
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unsigned_int: u64,
signed_int: i64,
/// If the int does not fit into the previous respective slots,
/// use a bit int to store it
big_int: std.math.big.int.Managed,
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float: f64,
@"fn",
runtime,
comptime_undetermined,
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pub fn eql(data: *ValueData, other_data: *ValueData) bool {
if (std.meta.activeTag(data.*) != std.meta.activeTag(other_data.*)) return false;
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// std.enums.
// std.meta.activeTag(u: anytype)
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switch (data.*) {
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.@"bool" => return data.@"bool" == other_data.@"bool",
.big_int => return data.big_int.eq(other_data.big_int),
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.unsigned_int => return data.unsigned_int == other_data.unsigned_int,
.signed_int => return data.signed_int == other_data.signed_int,
.float => return data.float == other_data.float,
else => return false,
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}
}
/// Get the bit count required to store a certain integer
pub fn bitCount(data: ValueData) ?u16 {
return switch (data) {
// TODO: Implement for signed ints
.unsigned_int => |i| if (i == 0) 0 else std.math.log2_int_ceil(@TypeOf(i), i + 1),
.big_int => |bi| @intCast(u16, bi.bitCountAbs()),
else => null,
};
}
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};
pub const FieldDefinition = struct {
node_idx: Ast.Node.Index,
/// Store name so tree doesn't need to be used to access field name
/// When the field is a tuple field, `name` will be an empty slice
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name: []const u8,
@"type": Type,
default_value: ?Value,
};
pub const Declaration = struct {
scope: *InterpreterScope,
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node_idx: Ast.Node.Index,
/// Store name so tree doesn't need to be used to access declaration name
name: []const u8,
/// If value is null, declaration has not been interpreted yet
value: ?Value = null,
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// TODO: figure this out
// pub const DeclarationKind = enum{variable, function};
// pub fn declarationKind(declaration: Declaration, tree: Ast) DeclarationKind {
// return switch(tree.nodes.items(.tag)[declaration.node_idx]) {
// .fn_proto,
// .fn_proto_one,
// .fn_proto_simple,
// .fn_proto_multi,
// .fn_decl
// }
// }
pub fn getValue(decl: *Declaration) InterpretError!Value {
var interpreter = decl.scope.interpreter;
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const tree = decl.scope.interpreter.getHandle().tree;
const tags = tree.nodes.items(.tag);
if (decl.value == null) {
switch (tags[decl.node_idx]) {
.global_var_decl,
.local_var_decl,
.aligned_var_decl,
.simple_var_decl,
=> {
const var_decl = ast.varDecl(tree, decl.node_idx).?;
if (var_decl.ast.init_node == 0)
return error.CriticalAstFailure;
var value = try (try interpreter.interpret(var_decl.ast.init_node, decl.scope, .{})).getValue();
if (var_decl.ast.type_node != 0) {
var type_val = try (try interpreter.interpret(var_decl.ast.type_node, decl.scope, .{})).getValue();
if (type_val.@"type".getTypeInfo() != .@"type") {
try interpreter.recordError(
decl.node_idx,
"expected_type",
std.fmt.allocPrint(interpreter.allocator, "expected type 'type', found '{s}'", .{interpreter.formatTypeInfo(type_val.@"type".getTypeInfo())}) catch return error.CriticalAstFailure,
);
return error.InvalidCast;
}
value = try interpreter.cast(var_decl.ast.type_node, type_val.value_data.@"type", value);
}
decl.value = value;
},
else => @panic("No other case supported for lazy declaration evaluation"),
}
}
return decl.value.?;
}
pub fn isConstant(declaration: Declaration) bool {
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const tree = declaration.scope.interpreter.getHandle().tree;
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return switch (tree.nodes.items(.tag)[declaration.node_idx]) {
.global_var_decl,
.local_var_decl,
.aligned_var_decl,
.simple_var_decl,
=> {
return tree.tokenSlice(ast.varDecl(tree, declaration.node_idx).?.ast.mut_token).len != 3;
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},
else => false,
};
}
};
pub fn createType(interpreter: *ComptimeInterpreter, node_idx: Ast.Node.Index, type_info: TypeInfo) std.mem.Allocator.Error!Type {
// TODO: Figure out dedup
var hasher = std.hash.Wyhash.init(0);
var gpr = try interpreter.type_info_map.getOrPutContext(interpreter.allocator, type_info, .{ .interpreter = interpreter.*, .hasher = &hasher });
if (gpr.found_existing) {
return Type{ .interpreter = interpreter, .node_idx = node_idx, .info_idx = gpr.value_ptr.* };
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} else {
try interpreter.type_info.append(interpreter.allocator, type_info);
const info_idx = interpreter.type_info.items.len - 1;
gpr.value_ptr.* = info_idx;
return Type{ .interpreter = interpreter, .node_idx = node_idx, .info_idx = info_idx };
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}
}
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pub fn createValueData(interpreter: *ComptimeInterpreter, data: ValueData) error{OutOfMemory}!*ValueData {
var vd = try interpreter.allocator.create(ValueData);
try interpreter.value_data_list.append(interpreter.allocator, vd);
vd.* = data;
return vd;
}
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pub const TypeInfoFormatter = struct {
interpreter: *const ComptimeInterpreter,
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ti: TypeInfo,
pub fn format(value: TypeInfoFormatter, comptime fmt: []const u8, options: std.fmt.FormatOptions, writer: anytype) !void {
_ = fmt;
_ = options;
return switch (value.ti) {
.int => |ii| switch (ii.signedness) {
.signed => try writer.print("i{d}", .{ii.bits}),
.unsigned => try writer.print("u{d}", .{ii.bits}),
}, // TODO
.float => |f| try writer.print("f{d}", .{f}),
.@"comptime_int" => try writer.writeAll("comptime_int"),
.@"comptime_float" => try writer.writeAll("comptime_float"),
.@"type" => try writer.writeAll("type"),
.@"bool" => try writer.writeAll("bool"),
.@"struct" => |s| {
try writer.writeAll("struct {");
var field_iterator = s.fields.iterator();
while (field_iterator.next()) |di| {
try writer.print("{s}: {s}, ", .{ di.key_ptr.*, value.interpreter.formatTypeInfo(di.value_ptr.*.@"type".getTypeInfo()) });
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}
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var iterator = s.scope.declarations.iterator();
while (iterator.next()) |di| {
const decl = di.value_ptr;
if (decl.isConstant()) {
if (decl.value) |sv| {
try writer.print("const {s}: {any} = { }, ", .{
decl.name,
value.interpreter.formatTypeInfo(sv.@"type".getTypeInfo()),
value.interpreter.formatValue(sv),
});
} else {
try writer.print("const {s} (not analyzed), ", .{decl.name});
}
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} else {
if (decl.value) |sv| {
try writer.print("var {s}: {any} = { }, ", .{
decl.name,
value.interpreter.formatTypeInfo(sv.@"type".getTypeInfo()),
value.interpreter.formatValue(sv),
});
} else {
try writer.print("var {s} (not analyzed), ", .{decl.name});
}
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}
}
try writer.writeAll("}");
},
else => try writer.print("UnimplementedTypeInfoPrint", .{}),
};
}
};
pub fn formatTypeInfo(interpreter: *const ComptimeInterpreter, ti: TypeInfo) TypeInfoFormatter {
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return TypeInfoFormatter{ .interpreter = interpreter, .ti = ti };
}
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pub const ValueFormatter = struct {
interpreter: *const ComptimeInterpreter,
val: Value,
pub fn format(form: ValueFormatter, comptime fmt: []const u8, options: std.fmt.FormatOptions, writer: anytype) !void {
_ = fmt;
_ = options;
var value = form.val;
var ti = value.@"type".getTypeInfo();
return switch (ti) {
.int, .@"comptime_int" => switch (value.value_data.*) {
.unsigned_int => |a| try writer.print("{d}", .{a}),
.signed_int => |a| try writer.print("{d}", .{a}),
.big_int => |a| try writer.print("{d}", .{a}),
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else => unreachable,
},
.@"type" => try writer.print("{ }", .{form.interpreter.formatTypeInfo(value.value_data.@"type".getTypeInfo())}),
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else => try writer.print("UnimplementedValuePrint", .{}),
};
}
};
pub fn formatValue(interpreter: *const ComptimeInterpreter, value: Value) ValueFormatter {
return ValueFormatter{ .interpreter = interpreter, .val = value };
}
// pub const Comptimeness = enum { @"comptime", runtime };
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pub const InterpreterScope = struct {
interpreter: *ComptimeInterpreter,
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// TODO: Actually use this value
// comptimeness: Comptimeness,
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parent: ?*InterpreterScope = null,
node_idx: Ast.Node.Index,
declarations: std.StringHashMapUnmanaged(Declaration) = .{},
/// Resizes can modify element pointer locations, so we use a list of pointers
child_scopes: std.ArrayListUnmanaged(*InterpreterScope) = .{},
pub const ScopeKind = enum { container, block, function };
pub fn scopeKind(scope: InterpreterScope) ScopeKind {
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const tree = scope.interpreter.getHandle().tree;
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return switch (tree.nodes.items(.tag)[scope.node_idx]) {
.container_decl,
.container_decl_trailing,
.container_decl_arg,
.container_decl_arg_trailing,
.container_decl_two,
.container_decl_two_trailing,
.tagged_union,
.tagged_union_trailing,
.tagged_union_two,
.tagged_union_two_trailing,
.tagged_union_enum_tag,
.tagged_union_enum_tag_trailing,
.root,
.error_set_decl,
=> .container,
else => .block,
};
}
pub fn getLabel(scope: InterpreterScope) ?Ast.TokenIndex {
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const tree = scope.interpreter.getHandle().tree;
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const token_tags = tree.tokens.items(.tag);
return switch (scope.scopeKind()) {
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.block => z: {
const lbrace = tree.nodes.items(.main_token)[scope.node_idx];
break :z if (token_tags[lbrace - 1] == .colon and token_tags[lbrace - 2] == .identifier)
lbrace - 2
else
null;
},
else => null,
};
}
pub const ParentScopeIterator = struct {
maybe_scope: ?*InterpreterScope,
pub fn next(psi: *ParentScopeIterator) ?*InterpreterScope {
if (psi.maybe_scope) |scope| {
const curr = scope;
psi.maybe_scope = scope.parent;
return curr;
} else return null;
}
};
pub fn parentScopeIterator(scope: *InterpreterScope) ParentScopeIterator {
return ParentScopeIterator{ .maybe_scope = scope };
}
pub fn deinit(scope: *InterpreterScope) void {
const allocator = scope.interpreter.allocator;
scope.declarations.deinit(allocator);
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for (scope.child_scopes.items) |child| child.deinit();
scope.child_scopes.deinit(allocator);
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allocator.destroy(scope);
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}
};
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pub fn newScope(
interpreter: *ComptimeInterpreter,
maybe_parent: ?*InterpreterScope,
node_idx: Ast.Node.Index,
) std.mem.Allocator.Error!*InterpreterScope {
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var ls = try interpreter.allocator.create(InterpreterScope);
if (maybe_parent) |parent| try parent.child_scopes.append(interpreter.allocator, ls);
ls.* = .{
.interpreter = interpreter,
.parent = maybe_parent,
.node_idx = node_idx,
};
return ls;
}
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,
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else => null,
};
}
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pub fn getValue(result: InterpretResult) error{ExpectedValue}!Value {
return result.maybeGetValue() orelse error.ExpectedValue;
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}
};
fn getDeclCount(tree: Ast, node_idx: Ast.Node.Index) usize {
var buffer: [2]Ast.Node.Index = undefined;
const members = ast.declMembers(tree, node_idx, &buffer);
var count: usize = 0;
for (members) |member| {
switch (tree.nodes.items(.tag)[member]) {
.global_var_decl,
.local_var_decl,
.aligned_var_decl,
.simple_var_decl,
=> count += 1,
else => {},
}
}
return count;
}
pub fn huntItDown(
interpreter: *ComptimeInterpreter,
scope: *InterpreterScope,
decl_name: []const u8,
options: InterpretOptions,
) InterpretError!*Declaration {
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const tree = interpreter.getHandle().tree;
const tags = tree.nodes.items(.tag);
var psi = scope.parentScopeIterator();
while (psi.next()) |pscope| {
const known_decl = pscope.declarations.getEntry(decl_name);
if (pscope.scopeKind() == .container and
known_decl == null and
pscope.declarations.count() != getDeclCount(tree, pscope.node_idx))
{
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log.info("Order-independent evaluating {s}...", .{decl_name});
var buffer: [2]Ast.Node.Index = undefined;
const members = ast.declMembers(tree, pscope.node_idx, &buffer);
for (members) |member| {
switch (tags[member]) {
.global_var_decl,
.local_var_decl,
.aligned_var_decl,
.simple_var_decl,
=> {
if (std.mem.eql(u8, analysis.getDeclName(tree, member).?, decl_name)) {
_ = try interpreter.interpret(member, pscope, options);
return pscope.declarations.getEntry(decl_name).?.value_ptr;
}
},
else => {},
}
}
}
return (known_decl orelse continue).value_ptr;
}
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log.err("Identifier not found: {s}", .{decl_name});
return error.IdentifierNotFound;
}
pub fn cast(
interpreter: *ComptimeInterpreter,
node_idx: Ast.Node.Index,
dest_type: Type,
value: Value,
) error{ OutOfMemory, InvalidCast }!Value {
const value_data = value.value_data;
const to_type_info = dest_type.getTypeInfo();
const from_type_info = value.@"type".getTypeInfo();
// TODO: Implement more implicit casts
if (from_type_info.eql(to_type_info)) return value;
const err = switch (from_type_info) {
.@"comptime_int" => switch (to_type_info) {
.int => {
if (value_data.bitCount().? > to_type_info.int.bits) {
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switch (value_data.*) {
.unsigned_int => |bi| try interpreter.recordError(node_idx, "invalid_cast", try std.fmt.allocPrint(interpreter.allocator, "integer value {d} cannot be coerced to type '{s}'", .{ bi, interpreter.formatTypeInfo(to_type_info) })),
.signed_int => |bi| try interpreter.recordError(node_idx, "invalid_cast", try std.fmt.allocPrint(interpreter.allocator, "integer value {d} cannot be coerced to type '{s}'", .{ bi, interpreter.formatTypeInfo(to_type_info) })),
.big_int => |bi| try interpreter.recordError(node_idx, "invalid_cast", try std.fmt.allocPrint(interpreter.allocator, "integer value {d} cannot be coerced to type '{s}'", .{ bi, interpreter.formatTypeInfo(to_type_info) })),
else => unreachable,
}
return error.InvalidCast;
}
},
else => error.InvalidCast,
},
else => error.InvalidCast,
};
err catch |e| {
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try interpreter.recordError(node_idx, "invalid_cast", try std.fmt.allocPrint(interpreter.allocator, "invalid cast from '{s}' to '{s}'", .{ interpreter.formatTypeInfo(from_type_info), interpreter.formatTypeInfo(to_type_info) }));
return e;
};
return Value{
.interpreter = interpreter,
.node_idx = node_idx,
.@"type" = dest_type,
.value_data = value.value_data,
};
}
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// Might be useful in the future
pub const InterpretOptions = struct {};
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pub const InterpretError = std.mem.Allocator.Error || std.fmt.ParseIntError || std.fmt.ParseFloatError || error{
InvalidCharacter,
InvalidBase,
ExpectedValue,
InvalidOperation,
CriticalAstFailure,
InvalidBuiltin,
IdentifierNotFound,
MissingArguments,
ImportFailure,
InvalidCast,
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};
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pub fn interpret(
interpreter: *ComptimeInterpreter,
node_idx: Ast.Node.Index,
scope: ?*InterpreterScope,
options: InterpretOptions,
) InterpretError!InterpretResult {
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const tree = interpreter.getHandle().tree;
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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,
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.root,
.error_set_decl,
=> {
var container_scope = try interpreter.newScope(scope, node_idx);
var type_info = TypeInfo{
.@"struct" = .{
.scope = container_scope,
},
};
var cont_type = try interpreter.createType(node_idx, type_info);
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if (node_idx == 0) interpreter.root_type = cont_type;
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var buffer: [2]Ast.Node.Index = undefined;
const members = ast.declMembers(tree, node_idx, &buffer);
var field_idx: usize = 0;
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for (members) |member| {
const maybe_container_field: ?zig.Ast.full.ContainerField = switch (tags[member]) {
.container_field => tree.containerField(member),
.container_field_align => tree.containerFieldAlign(member),
.container_field_init => tree.containerFieldInit(member),
else => null,
};
if (maybe_container_field) |field_info| {
var init_type_value = try (try interpreter.interpret(field_info.ast.type_expr, container_scope, .{})).getValue();
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var default_value = if (field_info.ast.value_expr == 0)
null
else
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try (try interpreter.interpret(field_info.ast.value_expr, container_scope, .{})).getValue();
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if (init_type_value.@"type".getTypeInfo() != .@"type") {
try interpreter.recordError(
field_info.ast.type_expr,
"expected_type",
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try std.fmt.allocPrint(interpreter.allocator, "expected type 'type', found '{s}'", .{interpreter.formatTypeInfo(init_type_value.@"type".getTypeInfo())}),
);
continue;
}
const name = if (field_info.ast.tuple_like)
&[0]u8{}
else tree.tokenSlice(field_info.ast.main_token);
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const field = FieldDefinition{
.node_idx = member,
.name = name,
.@"type" = init_type_value.value_data.@"type",
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.default_value = default_value,
// TODO: Default values
// .@"type" = T: {
// var value = (try interpreter.interpret(field_info.ast.type_expr, scope_idx, true)).?.value;
// break :T @ptrCast(*Type, @alignCast(@alignOf(*Type), value)).*;
// },
// .value = null,
};
try cont_type.getTypeInfoMutable().@"struct".fields.put(interpreter.allocator, name, field);
field_idx += 1;
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} else {
_ = try interpreter.interpret(member, container_scope, options);
}
}
return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"type" = cont_type }),
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} };
},
.global_var_decl,
.local_var_decl,
.aligned_var_decl,
.simple_var_decl,
=> {
// TODO: Add 0 check
const name = analysis.getDeclName(tree, node_idx).?;
if (scope.?.declarations.contains(name))
return InterpretResult{ .nothing = {} };
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const decl = ast.varDecl(tree, node_idx).?;
if (decl.ast.init_node == 0)
return InterpretResult{ .nothing = {} };
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try scope.?.declarations.put(interpreter.allocator, name, .{
.scope = scope.?,
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.node_idx = node_idx,
.name = name,
});
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// 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 scope.?.declarations.getPtr(name).?.getValue();
return InterpretResult{ .nothing = {} };
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},
.block,
.block_semicolon,
.block_two,
.block_two_semicolon,
=> {
// try interpreter.scopes.append(interpreter.allocator, .{
// .node_idx = node_idx,
// .parent_scope = parent_scope_idx orelse std.math.maxInt(usize),
// });
// const scope_idx = interpreter.scopes.items.len - 1;
var block_scope = try interpreter.newScope(scope, node_idx);
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_scope, options);
switch (ret) {
.@"break" => |lllll| {
const maybe_block_label_string = if (scope.?.getLabel()) |i| tree.tokenSlice(i) else null;
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if (lllll) |l| {
if (maybe_block_label_string) |ls| {
if (std.mem.eql(u8, l, ls)) {
return InterpretResult{ .nothing = {} };
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} else return ret;
} else return ret;
} else {
return InterpretResult{ .nothing = {} };
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}
},
.break_with_value => |bwv| {
const maybe_block_label_string = if (scope.?.getLabel()) |i| tree.tokenSlice(i) else null;
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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 = {} };
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},
.identifier => {
var value = tree.getNodeSource(node_idx);
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if (std.mem.eql(u8, "bool", value)) return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"type" = try interpreter.createType(node_idx, .{ .@"bool" = {} }) }),
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} };
if (std.mem.eql(u8, "true", value)) return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"bool" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"bool" = true }),
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} };
if (std.mem.eql(u8, "false", value)) return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"bool" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"bool" = false }),
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} };
if (value.len == 5 and (value[0] == 'u' or value[0] == 'i') and std.mem.eql(u8, "size", value[1..])) return InterpretResult{
.value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{
.@"type" = try interpreter.createType(node_idx, .{
.int = .{
.signedness = if (value[0] == 'u') .unsigned else .signed,
.bits = 64, // TODO: Platform specific
},
}),
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}),
},
};
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if (std.mem.eql(u8, "type", value)) {
return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }) }),
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} };
} else if (value.len >= 2 and (value[0] == 'u' or value[0] == 'i')) int: {
return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"type" = try interpreter.createType(node_idx, .{
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.int = .{
.signedness = if (value[0] == 'u') .unsigned else .signed,
.bits = std.fmt.parseInt(u16, value[1..], 10) catch break :int,
},
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}) }),
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} };
}
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// TODO: Floats
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// Logic to find identifiers in accessible scopes
return InterpretResult{ .value = try (interpreter.huntItDown(scope.?, value, options) catch |err| {
if (err == error.IdentifierNotFound) try interpreter.recordError(
node_idx,
"undeclared_identifier",
try std.fmt.allocPrint(interpreter.allocator, "use of undeclared identifier '{s}'", .{value}),
);
return err;
}).getValue() };
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},
.field_access => {
if (data[node_idx].rhs == 0) return error.CriticalAstFailure;
const rhs_str = ast.tokenSlice(tree, data[node_idx].rhs) catch return error.CriticalAstFailure;
var ir = try interpreter.interpret(data[node_idx].lhs, scope, options);
var irv = try ir.getValue();
var sub_scope = irv.value_data.@"type".getTypeInfo().getScopeOfType() orelse return error.IdentifierNotFound;
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var scope_sub_decl = sub_scope.interpreter.huntItDown(sub_scope, rhs_str, options) catch |err| {
if (err == error.IdentifierNotFound) try interpreter.recordError(
node_idx,
"undeclared_identifier",
try std.fmt.allocPrint(interpreter.allocator, "use of undeclared identifier '{s}'", .{rhs_str}),
);
return err;
};
return InterpretResult{
.value = try scope_sub_decl.getValue(),
};
},
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.grouped_expression => {
return try interpreter.interpret(data[node_idx].lhs, scope, 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
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InterpretResult{ .break_with_value = .{ .label = label, .value = try (try interpreter.interpret(data[node_idx].rhs, scope, options)).getValue() } };
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},
.@"return" => {
return if (data[node_idx].lhs == 0)
InterpretResult{ .@"return" = {} }
else
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InterpretResult{ .return_with_value = try (try interpreter.interpret(data[node_idx].lhs, scope, options)).getValue() };
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},
.@"if", .if_simple => {
const iff = ast.ifFull(tree, node_idx);
// TODO: Don't evaluate runtime ifs
// if (options.observe_values) {
const ir = try interpreter.interpret(iff.ast.cond_expr, scope, options);
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if ((try ir.getValue()).value_data.@"bool") {
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return try interpreter.interpret(iff.ast.then_expr, scope, options);
} else {
if (iff.ast.else_expr != 0) {
return try interpreter.interpret(iff.ast.else_expr, scope, options);
} else return InterpretResult{ .nothing = {} };
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}
},
.equal_equal => {
var a = try interpreter.interpret(data[node_idx].lhs, scope, options);
var b = try interpreter.interpret(data[node_idx].rhs, scope, options);
return InterpretResult{ .value = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"bool" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"bool" = (try a.getValue()).eql(try b.getValue()) }),
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} };
// a.getValue().eql(b.getValue())
},
.number_literal => {
const s = tree.getNodeSource(node_idx);
const nl = std.zig.parseNumberLiteral(s);
return InterpretResult{
.value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"comptime_int" = {} }),
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.value_data = try interpreter.createValueData(switch (nl) {
.float => .{ .float = try std.fmt.parseFloat(f64, s) },
.int => if (s[0] == '-') ValueData{ .signed_int = try std.fmt.parseInt(i64, s, 0) } else ValueData{ .unsigned_int = try std.fmt.parseInt(u64, s, 0) },
.big_int => |bii| ppp: {
var bi = try std.math.big.int.Managed.init(interpreter.allocator);
try bi.setString(@enumToInt(bii), s[if (bii != .decimal) @as(usize, 2) else @as(usize, 0)..]);
break :ppp .{ .big_int = bi };
},
.failure => return error.CriticalAstFailure,
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}),
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},
};
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},
.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, scope.?, options);
return InterpretResult{ .nothing = {} };
}
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var ir = try interpreter.interpret(data[node_idx].lhs, scope, options);
var to_value = try ir.getValue();
var from_value = (try (try interpreter.interpret(data[node_idx].rhs, scope.?, options)).getValue());
to_value.value_data.* = (try interpreter.cast(node_idx, to_value.@"type", from_value)).value_data.*;
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return InterpretResult{ .nothing = {} };
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},
// .@"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")) {
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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, scope, options)).maybeGetValue() orelse {
try writer.writeAll("indeterminate");
continue;
};
try writer.print("@as({s}, {s})", .{ interpreter.formatTypeInfo(value.@"type".getTypeInfo()), interpreter.formatValue(value) });
if (index != params.len - 1)
try writer.writeAll(", ");
}
try interpreter.recordError(node_idx, "compile_log", try final.toOwnedSlice());
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return InterpretResult{ .nothing = {} };
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}
if (std.mem.eql(u8, call_name, "@compileError")) {
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// TODO: Add message
try interpreter.recordError(node_idx, "compile_error", try std.fmt.allocPrint(interpreter.allocator, "compile error", .{}));
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]);
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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,
.@"type" = try interpreter.createType(node_idx, .{ .@"struct" = .{ .scope = try interpreter.newScope(null, 0) } }),
.value_data = try interpreter.createValueData(.{ .@"struct" = .{} }),
} };
}
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,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"type" = handle.interpreter.?.root_type.? }),
} };
}
if (std.mem.eql(u8, call_name, "@TypeOf")) {
if (params.len != 1) return error.InvalidBuiltin;
const value = try (try interpreter.interpret(params[0], scope, options)).getValue();
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"type" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"type" = value.@"type" }),
} };
}
if (std.mem.eql(u8, call_name, "@hasDecl")) {
if (params.len != 2) return error.InvalidBuiltin;
const value = try (try interpreter.interpret(params[0], scope, options)).getValue();
const field_name = try (try interpreter.interpret(params[1], scope, options)).getValue();
if (value.@"type".getTypeInfo() != .@"type") return error.InvalidBuiltin;
if (field_name.@"type".getTypeInfo() != .@"pointer") return error.InvalidBuiltin; // Check if it's a []const u8
const ti = value.value_data.@"type".getTypeInfo();
if (ti.getScopeOfType() == null) return error.InvalidBuiltin;
return InterpretResult{ .value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{ .@"bool" = {} }),
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.value_data = try interpreter.createValueData(.{ .@"bool" = ti.getScopeOfType().?.declarations.contains(field_name.value_data.slice_of_const_u8) }),
} };
}
if (std.mem.eql(u8, call_name, "@as")) {
if (params.len != 2) return error.InvalidBuiltin;
const as_type = try (try interpreter.interpret(params[0], scope, options)).getValue();
const value = try (try interpreter.interpret(params[1], scope, options)).getValue();
if (as_type.@"type".getTypeInfo() != .@"type") return error.InvalidBuiltin;
return InterpretResult{ .value = try interpreter.cast(node_idx, as_type.value_data.@"type", value) };
}
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log.err("Builtin not implemented: {s}", .{call_name});
return error.InvalidBuiltin;
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},
.string_literal => {
const value = tree.getNodeSource(node_idx)[1 .. tree.getNodeSource(node_idx).len - 1];
var val = Value{
.interpreter = interpreter,
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.node_idx = node_idx,
// TODO: This is literally the wrong type lmao
// the actual type is *[len:0]u8 because we're pointing
// to a fixed size value in the data(?) section (when we're compilign zig code)
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.@"type" = try interpreter.createType(node_idx, .{
.pointer = .{
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.size = .one,
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.is_const = true,
.is_volatile = false,
.child = try interpreter.createType(0, .{ .int = .{
.bits = 8,
.signedness = .unsigned,
} }),
.is_allowzero = false,
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.sentinel = null,
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},
}),
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.value_data = try interpreter.createValueData(.{ .slice_of_const_u8 = value }),
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};
// TODO: Add type casting, sentinel
// TODO: Should this be a `*const [len:0]u8`?
// try val.value_data.slice_ptr.append(interpreter.allocator, .{ .unsigned_int = 0 });
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return InterpretResult{ .value = val };
},
// TODO: Add comptime autodetection; e.g. const MyArrayList = std.ArrayList(u8)
.@"comptime" => {
return try interpreter.interpret(data[node_idx].lhs, scope, .{});
},
// .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: Add params
var type_info = TypeInfo{
.@"fn" = .{
.return_type = null,
},
};
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// 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";
var value = Value{
.interpreter = interpreter,
.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, type_info),
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.value_data = try interpreter.createValueData(.{ .@"fn" = {} }),
};
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const name = analysis.getDeclName(tree, node_idx).?;
try scope.?.declarations.put(interpreter.allocator, name, .{
.scope = scope.?,
.node_idx = node_idx,
.name = name,
.@"value" = value,
});
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return InterpretResult{ .nothing = {} };
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},
.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) orelse unreachable;
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var args = try std.ArrayListUnmanaged(Value).initCapacity(interpreter.allocator, call_full.ast.params.len);
defer args.deinit(interpreter.allocator);
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for (call_full.ast.params) |param| {
try args.append(interpreter.allocator, try (try interpreter.interpret(param, scope, .{})).getValue());
}
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const func_id_result = try interpreter.interpret(call_full.ast.fn_expr, interpreter.root_type.?.getTypeInfo().getScopeOfType().?, .{});
const func_id_val = try func_id_result.getValue();
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const call_res = try interpreter.call(interpreter.root_type.?.getTypeInfo().getScopeOfType().?, func_id_val.node_idx, args.items, options);
// defer call_res.scope.deinit();
// 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 = {} },
};
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},
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.bool_not => {
const result = try interpreter.interpret(data[node_idx].lhs, scope, .{});
const value = (try result.getValue());
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if (value.value_data.* != .@"bool") return error.InvalidOperation;
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return InterpretResult{
.value = .{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = value.@"type",
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.value_data = try interpreter.createValueData(.{ .@"bool" = !value.value_data.@"bool" }),
},
};
},
.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, scope, .{});
const value = (try result.getValue());
return InterpretResult{
.value = .{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = try interpreter.createType(node_idx, .{
.pointer = .{
.size = .one,
.is_const = false,
.is_volatile = false,
.child = value.@"type",
.is_allowzero = false,
.sentinel = null,
},
}),
.value_data = try interpreter.createValueData(.{ .@"one_ptr" = value.value_data }),
},
};
},
.deref => {
const result = try interpreter.interpret(data[node_idx].lhs, scope, .{});
const value = (try result.getValue());
const ti = value.@"type".getTypeInfo();
if (ti != .pointer) {
try interpreter.recordError(node_idx, "invalid_deref", try std.fmt.allocPrint(interpreter.allocator, "cannot deference non-pointer", .{}));
return error.InvalidOperation;
}
// TODO: Check if this is a one_ptr or not
return InterpretResult{
.value = .{
.interpreter = interpreter,
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.node_idx = node_idx,
.@"type" = ti.pointer.child,
.value_data = value.value_data.one_ptr,
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},
};
},
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else => {
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log.err("Unhandled {any}", .{tags[node_idx]});
return InterpretResult{ .nothing = {} };
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},
}
}
pub const CallResult = struct {
scope: *InterpreterScope,
result: union(enum) {
value: Value,
nothing,
},
};
pub fn call(
interpreter: *ComptimeInterpreter,
scope: ?*InterpreterScope,
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func_node_idx: Ast.Node.Index,
arguments: []const Value,
options: InterpretOptions,
) InterpretError!CallResult {
// _ = options;
// TODO: type check args
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const tree = interpreter.getHandle().tree;
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const tags = tree.nodes.items(.tag);
if (tags[func_node_idx] != .fn_decl) return error.CriticalAstFailure;
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// TODO: Make argument scope to evaluate arguments in
var fn_scope = try interpreter.newScope(scope, func_node_idx);
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var buf: [1]Ast.Node.Index = undefined;
var proto = ast.fnProto(tree, func_node_idx, &buf).?;
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_scope, options)).getValue();
if (tex.@"type".getTypeInfo() != .@"type") {
try interpreter.recordError(
param.type_expr,
"expected_type",
std.fmt.allocPrint(interpreter.allocator, "expected type 'type', found '{s}'", .{interpreter.formatTypeInfo(tex.@"type".getTypeInfo())}) catch return error.CriticalAstFailure,
);
return error.InvalidCast;
}
if (param.name_token) |nt| {
const decl = Declaration{
.scope = fn_scope,
.node_idx = param.type_expr,
.name = tree.tokenSlice(nt),
.value = try interpreter.cast(arguments[arg_index].node_idx, tex.value_data.@"type", arguments[arg_index]),
};
try fn_scope.declarations.put(interpreter.allocator, tree.tokenSlice(nt), decl);
arg_index += 1;
}
}
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const body = tree.nodes.items(.data)[func_node_idx].rhs;
const result = try interpreter.interpret(body, fn_scope, .{});
// TODO: Defers
return CallResult{
.scope = fn_scope,
.result = switch (result) {
.@"return", .nothing => .{ .nothing = {} }, // nothing could be due to an error
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.@"return_with_value" => |v| .{ .value = v },
else => @panic("bruh"),
},
};
}