zls/src/references.zig

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const std = @import("std");
const DocumentStore = @import("document_store.zig");
const analysis = @import("analysis.zig");
const types = @import("types.zig");
const offsets = @import("offsets.zig");
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const log = std.log.scoped(.references);
usingnamespace @import("ast.zig");
const ast = std.zig.ast;
fn tokenReference(
handle: *DocumentStore.Handle,
tok: ast.TokenIndex,
encoding: offsets.Encoding,
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context: anytype,
comptime handler: anytype,
) !void {
const loc = offsets.tokenRelativeLocation(handle.tree, 0, handle.tree.tokens.items(.start)[tok], encoding) catch return;
try handler(context, types.Location{
.uri = handle.uri(),
.range = .{
.start = .{
.line = @intCast(i64, loc.line),
.character = @intCast(i64, loc.column),
},
.end = .{
.line = @intCast(i64, loc.line),
.character = @intCast(i64, loc.column + offsets.tokenLength(handle.tree, tok, encoding)),
},
},
});
}
pub fn labelReferences(
arena: *std.heap.ArenaAllocator,
decl: analysis.DeclWithHandle,
encoding: offsets.Encoding,
include_decl: bool,
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context: anytype,
comptime handler: anytype,
) !void {
std.debug.assert(decl.decl.* == .label_decl);
const handle = decl.handle;
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const tree = handle.tree;
const token_tags = tree.tokens.items(.tag);
// Find while / for / block from label -> iterate over children nodes, find break and continues, change their labels if they match.
// This case can be implemented just by scanning tokens.
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const first_tok = tree.firstToken(decl.decl.label_decl);
const last_tok = tree.firstToken(decl.decl.label_decl);
if (include_decl) {
// The first token is always going to be the label
try tokenReference(handle, first_tok, encoding, context, handler);
}
var curr_tok = first_tok + 1;
while (curr_tok < last_tok - 2) : (curr_tok += 1) {
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const curr_id = token_tags[curr_tok];
if ((curr_id == .keyword_break or curr_id == .keyword_continue) and token_tags[curr_tok + 1] == .colon and
token_tags[curr_tok + 2] == .identifier)
{
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if (std.mem.eql(u8, tree.tokenSlice(curr_tok + 2), tree.tokenSlice(first_tok))) {
try tokenReference(handle, first_tok, encoding, context, handler);
}
}
}
}
fn symbolReferencesInternal(
arena: *std.heap.ArenaAllocator,
store: *DocumentStore,
node_handle: analysis.NodeWithHandle,
decl: analysis.DeclWithHandle,
encoding: offsets.Encoding,
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context: anytype,
comptime handler: anytype,
) error{OutOfMemory}!void {
const node = node_handle.node;
const handle = node_handle.handle;
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const tree = handle.tree;
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if (node > tree.nodes.len) return;
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const node_tags = tree.nodes.items(.tag);
const datas = tree.nodes.items(.data);
const main_tokens = tree.nodes.items(.main_token);
const starts = tree.tokens.items(.start);
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switch (node_tags[node]) {
.block, .block_semicolon, .block_two, .block_two_semicolon => {
const statements: []const ast.Node.Index = switch (node_tags[node]) {
.block, .block_semicolon => tree.extra_data[datas[node].lhs..datas[node].rhs],
.block_two, .block_two_semicolon => blk: {
const statements = &[_]ast.Node.Index{ datas[node].lhs, datas[node].rhs };
const len: usize = if (datas[node].lhs == 0)
@as(usize, 0)
else if (datas[node].rhs == 0)
@as(usize, 1)
else
@as(usize, 2);
break :blk statements[0..len];
},
else => unreachable,
};
for (statements) |stmt|
try symbolReferencesInternal(arena, store, .{ .node = stmt, .handle = handle }, decl, encoding, context, handler);
},
.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,
=> {
var buf: [2]ast.Node.Index = undefined;
for (declMembers(tree, node, &buf)) |member|
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try symbolReferencesInternal(arena, store, .{ .node = member, .handle = handle }, decl, encoding, context, handler);
},
.global_var_decl,
.local_var_decl,
.simple_var_decl,
.aligned_var_decl,
=> {
const var_decl = varDecl(tree, node).?;
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if (var_decl.ast.type_node != 0) {
try symbolReferencesInternal(arena, store, .{ .node = var_decl.ast.type_node, .handle = handle }, decl, encoding, context, handler);
}
if (var_decl.ast.init_node != 0) {
try symbolReferencesInternal(arena, store, .{ .node = var_decl.ast.init_node, .handle = handle }, decl, encoding, context, handler);
}
},
.@"usingnamespace" => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
},
.container_field,
.container_field_align,
.container_field_init,
=> {
const field = containerField(tree, node).?;
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if (field.ast.type_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = field.ast.type_expr, .handle = handle }, decl, encoding, context, handler);
}
if (field.ast.value_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = field.ast.value_expr, .handle = handle }, decl, encoding, context, handler);
}
},
.identifier => {
if (try analysis.lookupSymbolGlobal(store, arena, handle, tree.getNodeSource(node), starts[main_tokens[node]])) |child| {
if (std.meta.eql(decl, child)) {
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try tokenReference(handle, main_tokens[node], encoding, context, handler);
}
}
},
.fn_proto,
.fn_proto_multi,
.fn_proto_one,
.fn_proto_simple,
.fn_decl,
=> {
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var buf: [1]ast.Node.Index = undefined;
const fn_proto = fnProto(tree, node, &buf).?;
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var it = fn_proto.iterate(tree);
while (it.next()) |param| {
if (param.type_expr != 0)
try symbolReferencesInternal(arena, store, .{ .node = param.type_expr, .handle = handle }, decl, encoding, context, handler);
}
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if (fn_proto.ast.return_type != 0) {
try symbolReferencesInternal(arena, store, .{ .node = fn_proto.ast.return_type, .handle = handle }, decl, encoding, context, handler);
}
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if (fn_proto.ast.align_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = fn_proto.ast.align_expr, .handle = handle }, decl, encoding, context, handler);
}
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if (fn_proto.ast.section_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = fn_proto.ast.section_expr, .handle = handle }, decl, encoding, context, handler);
}
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if (fn_proto.ast.callconv_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = fn_proto.ast.callconv_expr, .handle = handle }, decl, encoding, context, handler);
}
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if (node_tags[node] == .fn_decl) {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
}
},
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.anyframe_type => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
},
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.@"defer" => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
},
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.@"comptime" => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
},
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.@"nosuspend" => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
},
.@"switch",
.switch_comma,
=> {
// TODO When renaming a union(enum) field, also rename switch items that refer to it.
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try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
const extra = tree.extraData(datas[node].rhs, ast.Node.SubRange);
const cases = tree.extra_data[extra.start..extra.end];
for (cases) |case| {
try symbolReferencesInternal(arena, store, .{ .node = case, .handle = handle }, decl, encoding, context, handler);
}
},
.switch_case_one => {
const case_one = tree.switchCaseOne(node);
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if (case_one.ast.target_expr != 0)
try symbolReferencesInternal(arena, store, .{ .node = case_one.ast.target_expr, .handle = handle }, decl, encoding, context, handler);
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for (case_one.ast.values) |val|
try symbolReferencesInternal(arena, store, .{ .node = val, .handle = handle }, decl, encoding, context, handler);
},
.switch_case => {
const case = tree.switchCase(node);
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if (case.ast.target_expr != 0)
try symbolReferencesInternal(arena, store, .{ .node = case.ast.target_expr, .handle = handle }, decl, encoding, context, handler);
for (case.ast.values) |val|
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try symbolReferencesInternal(arena, store, .{ .node = val, .handle = handle }, decl, encoding, context, handler);
},
.@"while",
.while_simple,
.while_cont,
.for_simple,
.@"for",
=> {
const loop = whileAst(tree, node).?;
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try symbolReferencesInternal(arena, store, .{ .node = loop.ast.cond_expr, .handle = handle }, decl, encoding, context, handler);
if (loop.ast.cont_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = loop.ast.cont_expr, .handle = handle }, decl, encoding, context, handler);
}
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try symbolReferencesInternal(arena, store, .{ .node = loop.ast.then_expr, .handle = handle }, decl, encoding, context, handler);
if (loop.ast.else_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = loop.ast.else_expr, .handle = handle }, decl, encoding, context, handler);
}
},
.@"if",
.if_simple,
=> {
const if_node: ast.full.If = if (node_tags[node] == .@"if") ifFull(tree, node) else ifSimple(tree, node);
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try symbolReferencesInternal(arena, store, .{ .node = if_node.ast.cond_expr, .handle = handle }, decl, encoding, context, handler);
try symbolReferencesInternal(arena, store, .{ .node = if_node.ast.then_expr, .handle = handle }, decl, encoding, context, handler);
if (if_node.ast.else_expr != 0) {
try symbolReferencesInternal(arena, store, .{ .node = if_node.ast.else_expr, .handle = handle }, decl, encoding, context, handler);
}
},
.array_type,
.array_type_sentinel,
=> {
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try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
},
.ptr_type,
.ptr_type_aligned,
.ptr_type_bit_range,
.ptr_type_sentinel,
=> {
const ptr_type = ptrType(tree, node).?;
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if (ptr_type.ast.align_node != 0) {
try symbolReferencesInternal(arena, store, .{ .node = ptr_type.ast.align_node, .handle = handle }, decl, encoding, context, handler);
if (node_tags[node] == .ptr_type_bit_range) {
try symbolReferencesInternal(arena, store, .{
.node = ptr_type.ast.bit_range_start,
.handle = handle,
}, decl, encoding, context, handler);
try symbolReferencesInternal(arena, store, .{
.node = ptr_type.ast.bit_range_end,
.handle = handle,
}, decl, encoding, context, handler);
}
}
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if (ptr_type.ast.sentinel != 0) {
try symbolReferencesInternal(arena, store, .{ .node = ptr_type.ast.sentinel, .handle = handle }, decl, encoding, context, handler);
}
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try symbolReferencesInternal(arena, store, .{ .node = ptr_type.ast.child_type, .handle = handle }, decl, encoding, context, handler);
},
.address_of, .@"await", .bit_not, .bool_not, .optional_type, .negation, .negation_wrap, .@"resume", .@"try" => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
},
.array_init,
.array_init_comma,
.array_init_dot,
.array_init_dot_comma,
.array_init_one,
.array_init_one_comma,
.array_init_dot_two,
.array_init_dot_two_comma,
=> |n| {
var buf: [2]ast.Node.Index = undefined;
const array_init = switch (n) {
.array_init, .array_init_comma => tree.arrayInit(node),
.array_init_dot, .array_init_dot_comma => tree.arrayInitDot(node),
.array_init_one, .array_init_one_comma => tree.arrayInitOne(buf[0..1], node),
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.array_init_dot_two, .array_init_dot_two_comma => tree.arrayInitDotTwo(&buf, node),
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else => unreachable,
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};
if (array_init.ast.type_expr != 0)
try symbolReferencesInternal(arena, store, .{ .node = array_init.ast.type_expr, .handle = handle }, decl, encoding, context, handler);
for (array_init.ast.elements) |e|
try symbolReferencesInternal(arena, store, .{ .node = e, .handle = handle }, decl, encoding, context, handler);
},
.struct_init,
.struct_init_comma,
.struct_init_dot,
.struct_init_dot_comma,
.struct_init_dot_two,
.struct_init_dot_two_comma,
.struct_init_one,
.struct_init_one_comma,
=> |n| {
var buf: [2]ast.Node.Index = undefined;
const struct_init: ast.full.StructInit = switch (n) {
.struct_init, .struct_init_comma => tree.structInit(node),
.struct_init_dot, .struct_init_dot_comma => tree.structInitDot(node),
.struct_init_one, .struct_init_one_comma => tree.structInitOne(buf[0..1], node),
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.struct_init_dot_two, .struct_init_dot_two_comma => tree.structInitDotTwo(&buf, node),
else => unreachable,
};
if (struct_init.ast.type_expr != 0)
try symbolReferencesInternal(arena, store, .{ .node = struct_init.ast.type_expr, .handle = handle }, decl, encoding, context, handler);
for (struct_init.ast.fields) |field|
try symbolReferencesInternal(arena, store, .{ .node = field, .handle = handle }, decl, encoding, context, handler);
},
.call,
.call_comma,
.call_one,
.call_one_comma,
.async_call,
.async_call_comma,
.async_call_one,
.async_call_one_comma,
=> |c| {
var buf: [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(&buf, node),
else => unreachable,
};
if (call.ast.fn_expr != 0)
try symbolReferencesInternal(arena, store, .{ .node = call.ast.fn_expr, .handle = handle }, decl, encoding, context, handler);
for (call.ast.params) |param| {
try symbolReferencesInternal(arena, store, .{ .node = param, .handle = handle }, decl, encoding, context, handler);
}
},
.slice,
.slice_sentinel,
.slice_open,
=> |s| {
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const slice: ast.full.Slice = switch (s) {
.slice => tree.slice(node),
.slice_open => tree.sliceOpen(node),
.slice_sentinel => tree.sliceSentinel(node),
else => unreachable,
};
try symbolReferencesInternal(arena, store, .{ .node = slice.ast.sliced, .handle = handle }, decl, encoding, context, handler);
try symbolReferencesInternal(arena, store, .{ .node = slice.ast.start, .handle = handle }, decl, encoding, context, handler);
if (slice.ast.end != 0)
try symbolReferencesInternal(arena, store, .{ .node = slice.ast.end, .handle = handle }, decl, encoding, context, handler);
if (slice.ast.sentinel != 0)
try symbolReferencesInternal(arena, store, .{ .node = slice.ast.sentinel, .handle = handle }, decl, encoding, context, handler);
},
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.array_access => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
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},
.deref,
.unwrap_optional,
=> {
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try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
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},
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.grouped_expression => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
},
.@"return",
.@"break",
.@"continue",
=> {
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if (datas[node].lhs != 0) {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
}
},
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.@"suspend" => {
if (datas[node].lhs != 0) {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
}
},
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.builtin_call,
.builtin_call_comma,
.builtin_call_two,
.builtin_call_two_comma,
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=> |builtin_tag| {
const data = datas[node];
const params = switch (builtin_tag) {
.builtin_call, .builtin_call_comma => tree.extra_data[data.lhs..data.rhs],
.builtin_call_two, .builtin_call_two_comma => if (data.lhs == 0)
&[_]ast.Node.Index{}
else if (data.rhs == 0)
&[_]ast.Node.Index{data.lhs}
else
&[_]ast.Node.Index{ data.lhs, data.rhs },
else => unreachable,
};
for (params) |param|
try symbolReferencesInternal(arena, store, .{ .node = param, .handle = handle }, decl, encoding, context, handler);
},
.@"asm",
.asm_simple,
=> |a| {
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const _asm: ast.full.Asm = if (a == .@"asm") tree.asmFull(node) else tree.asmSimple(node);
if (_asm.ast.items.len == 0)
try symbolReferencesInternal(arena, store, .{ .node = _asm.ast.template, .handle = handle }, decl, encoding, context, handler);
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for (_asm.inputs) |input|
try symbolReferencesInternal(arena, store, .{ .node = input, .handle = handle }, decl, encoding, context, handler);
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for (_asm.outputs) |output|
try symbolReferencesInternal(arena, store, .{ .node = output, .handle = handle }, decl, encoding, context, handler);
},
.test_decl => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
},
.field_access => {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
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const rhs_str = tree.tokenSlice(datas[node].rhs);
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var bound_type_params = analysis.BoundTypeParams.init(&arena.allocator);
const left_type = try analysis.resolveFieldAccessLhsType(
store,
arena,
(try analysis.resolveTypeOfNodeInternal(store, arena, .{
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.node = datas[node].lhs,
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.handle = handle,
}, &bound_type_params)) orelse return,
&bound_type_params,
);
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const left_type_node = switch (left_type.type.data) {
.other => |n| n,
else => return,
};
if (try analysis.lookupSymbolContainer(
store,
arena,
.{ .node = left_type_node, .handle = left_type.handle },
rhs_str,
!left_type.type.is_type_val,
)) |child| {
if (std.meta.eql(child, decl)) {
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try tokenReference(handle, datas[node].rhs, encoding, context, handler);
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}
}
},
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.add,
.add_wrap,
.array_cat,
.array_mult,
.assign,
.assign_bit_and,
.assign_bit_or,
.assign_bit_shift_left,
.assign_bit_shift_right,
.assign_bit_xor,
.assign_div,
.assign_sub,
.assign_sub_wrap,
.assign_mod,
.assign_add,
.assign_add_wrap,
.assign_mul,
.assign_mul_wrap,
.bang_equal,
.bit_and,
.bit_or,
.bit_shift_left,
.bit_shift_right,
.bit_xor,
.bool_or,
.div,
.equal_equal,
.error_union,
.greater_or_equal,
.greater_than,
.less_or_equal,
.less_than,
.merge_error_sets,
.mod,
.mul,
.mul_wrap,
.switch_range,
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.sub,
.sub_wrap,
.@"orelse",
=> {
try symbolReferencesInternal(arena, store, .{ .node = datas[node].lhs, .handle = handle }, decl, encoding, context, handler);
try symbolReferencesInternal(arena, store, .{ .node = datas[node].rhs, .handle = handle }, decl, encoding, context, handler);
},
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else => {},
}
}
pub fn symbolReferences(
arena: *std.heap.ArenaAllocator,
store: *DocumentStore,
decl_handle: analysis.DeclWithHandle,
encoding: offsets.Encoding,
include_decl: bool,
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context: anytype,
comptime handler: anytype,
skip_std_references: bool,
) !void {
std.debug.assert(decl_handle.decl.* != .label_decl);
const curr_handle = decl_handle.handle;
if (include_decl) {
try tokenReference(curr_handle, decl_handle.nameToken(), encoding, context, handler);
}
switch (decl_handle.decl.*) {
.ast_node => |decl_node| {
try symbolReferencesInternal(arena, store, .{ .node = 0, .handle = curr_handle }, decl_handle, encoding, context, handler);
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var imports = std.ArrayList(*DocumentStore.Handle).init(&arena.allocator);
var handle_it = store.handles.iterator();
while (handle_it.next()) |entry| {
if (skip_std_references and std.mem.indexOf(u8, entry.key, "std") != null) {
if (!include_decl or entry.value != curr_handle)
continue;
}
// Check entry's transitive imports
try imports.append(entry.value);
var i: usize = 0;
blk: while (i < imports.items.len) : (i += 1) {
const import = imports.items[i];
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for (import.imports_used.items) |uri| {
const h = store.getHandle(uri) orelse break;
if (h == curr_handle) {
// entry does import curr_handle
try symbolReferencesInternal(arena, store, .{ .node = 0, .handle = entry.value }, decl_handle, encoding, context, handler);
break :blk;
}
select: {
for (imports.items) |item| {
if (item == h) {
// already checked this import
break :select;
}
}
try imports.append(h);
}
}
}
try imports.resize(0);
}
},
.param_decl => |param| {
// Rename the param tok.
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const fn_node: ast.full.FnProto = loop: for (curr_handle.document_scope.scopes) |scope| {
switch (scope.data) {
.function => |proto| {
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var buf: [1]ast.Node.Index = undefined;
const fn_proto = fnProto(curr_handle.tree, proto, &buf).?;
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var it = fn_proto.iterate(curr_handle.tree);
while (it.next()) |candidate| {
if (std.meta.eql(candidate, param)) {
if (curr_handle.tree.nodes.items(.tag)[proto] == .fn_decl) {
try symbolReferencesInternal(
arena,
store,
.{ .node = curr_handle.tree.nodes.items(.data)[proto].rhs, .handle = curr_handle },
decl_handle,
encoding,
context,
handler,
);
}
break :loop fn_proto;
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}
}
},
else => {},
}
} else {
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log.warn("Could not find param decl's function", .{});
return;
};
},
.pointer_payload, .switch_payload, .array_payload, .array_index => {
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try symbolReferencesInternal(arena, store, .{ .node = 0, .handle = curr_handle }, decl_handle, encoding, context, handler);
},
.label_decl => unreachable,
}
}