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Fix stack overflow and clean up a bit of resolveTypeOfNode (#297)

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Tau 2021-04-05 13:46:05 +02:00 committed by GitHub
parent 88d79a769c
commit b03fb5ffe3
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3 changed files with 88 additions and 80 deletions
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158
src/analysis.zig
View File

@ -147,7 +147,6 @@ pub fn getFunctionSnippet(
return buffer.toOwnedSlice();
}
/// Returns true if a function has a `self` parameter
pub fn hasSelfParam(
arena: *std.heap.ArenaAllocator,
document_store: *DocumentStore,
@ -194,7 +193,6 @@ pub fn getVariableSignature(tree: ast.Tree, var_decl: ast.full.VarDecl) []const
return tree.source[start..end];
}
// analysis.getContainerFieldSignature(handle.tree, field)
pub fn getContainerFieldSignature(tree: ast.Tree, field: ast.full.ContainerField) []const u8 {
const start = offsets.tokenLocation(tree, field.ast.name_token).start;
const end_node = if (field.ast.value_expr != 0) field.ast.value_expr else field.ast.type_expr;
@ -202,8 +200,8 @@ pub fn getContainerFieldSignature(tree: ast.Tree, field: ast.full.ContainerField
return tree.source[start..end];
}
/// The type node is "type"
fn typeIsType(tree: ast.Tree, node: ast.Node.Index) bool {
/// The node is the meta-type `type`
fn isMetaType(tree: ast.Tree, node: ast.Node.Index) bool {
if (tree.nodes.items(.tag)[node] == .identifier) {
return std.mem.eql(u8, tree.tokenSlice(tree.nodes.items(.main_token)[node]), "type");
}
@ -211,7 +209,7 @@ fn typeIsType(tree: ast.Tree, node: ast.Node.Index) bool {
}
pub fn isTypeFunction(tree: ast.Tree, func: ast.full.FnProto) bool {
return typeIsType(tree, func.ast.return_type);
return isMetaType(tree, func.ast.return_type);
}
pub fn isGenericFunction(tree: ast.Tree, func: ast.full.FnProto) bool {
@ -380,7 +378,6 @@ pub fn resolveVarDeclAlias(store: *DocumentStore, arena: *std.heap.ArenaAllocato
return null;
}
/// Returns `true` when the given `node` is one of the block tags
fn isBlock(tree: ast.Tree, node: ast.Node.Index) bool {
return switch (tree.nodes.items(.tag)[node]) {
.block,
@ -451,7 +448,6 @@ fn findReturnStatement(tree: ast.Tree, fn_decl: ast.full.FnProto, body: ast.Node
return findReturnStatementInternal(tree, fn_decl, body, &already_found);
}
/// Resolves the return type of a function
pub fn resolveReturnType(
store: *DocumentStore,
arena: *std.heap.ArenaAllocator,
@ -692,6 +688,21 @@ pub fn resolveTypeOfNodeInternal(
const handle = node_handle.handle;
const tree = handle.tree;
const state = struct {
var resolve_trail = std.ArrayListUnmanaged(NodeWithHandle){};
};
// If we were asked to resolve this node before,
// it is self-referential and we cannot resolve it.
for (state.resolve_trail.items) |i| {
if (i.node == node and i.handle == handle)
return null;
}
// We use the backing allocator here because the ArrayList expects its
// allocated memory to persist while it is empty.
try state.resolve_trail.append(arena.child_allocator, node_handle);
defer _ = state.resolve_trail.pop();
const main_tokens = tree.nodes.items(.main_token);
const node_tags = tree.nodes.items(.tag);
const datas = tree.nodes.items(.data);
@ -705,18 +716,16 @@ pub fn resolveTypeOfNodeInternal(
.aligned_var_decl,
=> {
const var_decl = varDecl(tree, node).?;
if (var_decl.ast.type_node != 0) block: {
return ((try resolveTypeOfNodeInternal(
store,
arena,
.{ .node = var_decl.ast.type_node, .handle = handle },
bound_type_params,
)) orelse break :block).instanceTypeVal();
if (var_decl.ast.type_node != 0) {
const decl_type = .{ .node = var_decl.ast.type_node, .handle = handle };
if (try resolveTypeOfNodeInternal(store, arena, decl_type, bound_type_params)) |typ|
return typ.instanceTypeVal();
}
return if (var_decl.ast.init_node != 0)
try resolveTypeOfNodeInternal(store, arena, .{ .node = var_decl.ast.init_node, .handle = handle }, bound_type_params)
else
null;
if (var_decl.ast.init_node == 0)
return null;
const value = .{ .node = var_decl.ast.init_node, .handle = handle };
return try resolveTypeOfNodeInternal(store, arena, value, bound_type_params);
},
.identifier => {
if (isTypeIdent(handle.tree, main_tokens[node])) {
@ -737,7 +746,8 @@ pub fn resolveTypeOfNodeInternal(
.ast_node => |n| {
if (n == node) return null;
if (varDecl(child.handle.tree, n)) |var_decl| {
if (var_decl.ast.init_node != 0 and var_decl.ast.init_node == node) return null;
if (var_decl.ast.init_node == node)
return null;
}
},
else => {},
@ -758,12 +768,11 @@ pub fn resolveTypeOfNodeInternal(
};
if (field.ast.type_expr == 0) return null;
return ((try resolveTypeOfNodeInternal(
store,
arena,
.{ .node = field.ast.type_expr, .handle = handle },
bound_type_params,
)) orelse return null).instanceTypeVal();
const field_type = .{ .node = field.ast.type_expr, .handle = handle };
const typ = (try resolveTypeOfNodeInternal(store, arena, field_type, bound_type_params))
orelse return null;
return typ.instanceTypeVal();
},
.call,
.call_comma,
@ -775,18 +784,12 @@ pub fn resolveTypeOfNodeInternal(
.async_call_one_comma,
=> |c| {
var params: [1]ast.Node.Index = undefined;
const call: ast.full.Call = switch (c) {
.call, .call_comma, .async_call, .async_call_comma => tree.callFull(node),
.call_one, .call_one_comma, .async_call_one, .async_call_one_comma => tree.callOne(&params, node),
else => unreachable,
};
const call = callFull(tree, node, &params) orelse unreachable;
const decl = (try resolveTypeOfNodeInternal(
store,
arena,
.{ .node = call.ast.fn_expr, .handle = handle },
bound_type_params,
)) orelse return null;
const callee = .{ .node = call.ast.fn_expr, .handle = handle };
const decl =
(try resolveTypeOfNodeInternal(store, arena, callee, bound_type_params))
orelse return null;
if (decl.type.is_type_val) return null;
const decl_node = switch (decl.type.data) {
@ -797,25 +800,32 @@ pub fn resolveTypeOfNodeInternal(
const func_maybe = fnProto(decl.handle.tree, decl_node, &buf);
if (func_maybe) |fn_decl| {
// check for x.y(..). if '.' is found, it means first param should be skipped
const has_self_param = token_tags[call.ast.lparen - 2] == .period;
var expected_params = fn_decl.ast.params.len;
// If we call as method, the first parameter should be skipped
// TODO: Back-parse to extract the self argument?
var it = fn_decl.iterate(decl.handle.tree);
if (token_tags[call.ast.lparen - 2] == .period) {
if (try hasSelfParam(arena, store, handle, fn_decl)) {
_ = it.next();
expected_params -= 1;
}
}
// Bind type params to the expressions passed in txhe calls.
const param_len = std.math.min(call.ast.params.len + @boolToInt(has_self_param), fn_decl.ast.params.len);
// Bind type params to the arguments passed in the call.
const param_len = std.math.min(call.ast.params.len, expected_params);
var i: usize = 0;
while (it.next()) |decl_param| : (i += 1) {
if (i == 0 and has_self_param) continue;
if (i >= param_len) break;
if (!typeIsType(decl.handle.tree, decl_param.type_expr)) continue;
if (!isMetaType(decl.handle.tree, decl_param.type_expr))
continue;
const call_param_type = (try resolveTypeOfNodeInternal(store, arena, .{
.node = call.ast.params[i - @boolToInt(has_self_param)],
.handle = handle,
}, bound_type_params)) orelse continue;
if (!call_param_type.type.is_type_val) continue;
const argument = .{.node = call.ast.params[i], .handle = handle};
const argument_type =
(try resolveTypeOfNodeInternal(store, arena, argument, bound_type_params))
orelse continue;
if (!argument_type.type.is_type_val) continue;
_ = try bound_type_params.put(decl_param, call_param_type);
_ = try bound_type_params.put(decl_param, argument_type);
}
const has_body = decl.handle.tree.nodes.items(.tag)[decl_node] == .fn_decl;
@ -1243,7 +1253,6 @@ pub fn getFieldAccessType(
.handle = handle,
});
// TODO Actually bind params here when calling functions instead of just skipping args.
var bound_type_params = BoundTypeParams.init(&arena.allocator);
const tree = handle.tree;
@ -1343,6 +1352,7 @@ pub fn getFieldAccessType(
const has_body = cur_tree.nodes.items(.tag)[current_type_node] == .fn_decl;
const body = cur_tree.nodes.items(.data)[current_type_node].rhs;
// TODO Actually bind params here when calling functions instead of just skipping args.
if (try resolveReturnType(store, arena, func, current_type.handle, &bound_type_params, if (has_body) body else null)) |ret| {
current_type = ret;
// Skip to the right paren
@ -1989,7 +1999,7 @@ pub const DeclWithHandle = struct {
bound_type_params,
),
.param_decl => |param_decl| {
if (typeIsType(self.handle.tree, param_decl.type_expr)) {
if (isMetaType(self.handle.tree, param_decl.type_expr)) {
var bound_param_it = bound_type_params.iterator();
while (bound_param_it.next()) |entry| {
if (std.meta.eql(entry.key, param_decl)) return entry.value;
@ -2294,36 +2304,34 @@ fn resolveUse(
handle: *DocumentStore.Handle,
) error{OutOfMemory}!?DeclWithHandle {
const state = struct {
var using_trail = std.ArrayListUnmanaged(*const ast.Node.Index){};
var using_trail = std.ArrayListUnmanaged([*]const u8){};
};
// If we were asked to resolve this symbol before,
// it is self-referential and we cannot resolve it.
if (std.mem.indexOfScalar([*]const u8, state.using_trail.items, symbol.ptr) != null)
return null;
// We use the backing allocator here because the ArrayList expects its
// allocated memory to persist while it is empty.
try state.using_trail.append(arena.child_allocator, symbol.ptr);
defer _ = state.using_trail.pop();
for (uses) |use| {
if (std.mem.indexOfScalar(*const ast.Node.Index, state.using_trail.items, use) != null) continue;
// We use the child_allocator here because the ArrayList expects its
// allocated memory to persist while it is empty.
try state.using_trail.append(arena.child_allocator, use);
defer _ = state.using_trail.pop();
const expr = .{ .node = handle.tree.nodes.items(.data)[use.*].lhs, .handle = handle };
const expr_type_node = (try resolveTypeOfNode(store, arena, expr))
orelse continue;
const use_expr = (try resolveTypeOfNode(
store,
arena,
.{ .node = handle.tree.nodes.items(.data)[use.*].lhs, .handle = handle },
)) orelse continue;
const use_expr_node = switch (use_expr.type.data) {
.other => |n| n,
else => continue,
const expr_type = .{
.node = switch (expr_type_node.type.data) {
.other => |n| n,
else => continue,
},
.handle = expr_type_node.handle
};
if (try lookupSymbolContainer(
store,
arena,
.{ .node = use_expr_node, .handle = use_expr.handle },
symbol,
false,
)) |candidate| {
if (candidate.handle != handle and !candidate.isPublic()) {
continue;
if (try lookupSymbolContainer(store, arena, expr_type, symbol, false)) |candidate| {
if (candidate.handle == handle or candidate.isPublic()) {
return candidate;
}
return candidate;
}
}
return null;

8
src/ast.zig
View File

@ -885,15 +885,15 @@ pub fn fnProto(tree: ast.Tree, node: ast.Node.Index, buf: *[1]ast.Node.Index) ?a
pub fn callFull(tree: ast.Tree, node: ast.Node.Index, buf: *[1]ast.Node.Index) ?ast.full.Call {
return switch (tree.nodes.items(.tag)[node]) {
.async_call,
.async_call_comma,
.call,
.call_comma,
.async_call,
.async_call_comma,
=> tree.callFull(node),
.async_call_one,
.async_call_one_comma,
.call_one,
.call_one_comma,
.async_call_one,
.async_call_one_comma,
=> tree.callOne(buf, node),
else => null,
};

2
src/document_store.zig
View File

@ -23,7 +23,7 @@ pub const Handle = struct {
count: usize,
/// Contains one entry for every import in the document
import_uris: []const []const u8,
/// Items in thsi array list come from `import_uris`
/// Items in this array list come from `import_uris`
imports_used: std.ArrayListUnmanaged([]const u8),
tree: std.zig.ast.Tree,
document_scope: analysis.DocumentScope,