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josh11bandChandler Carruth
48c986f52d
Goal is to increase type safety, though more work needs to be done (see added TODOs). Note that, after this change, check handlers corresponding to deleted parse node kinds will no longer compile. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
101 lines
3.9 KiB
C++
101 lines
3.9 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "llvm/ADT/ScopeExit.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/convert.h"
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#include "toolchain/sem_ir/inst.h"
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namespace Carbon::Check {
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auto HandleCallExpr(Context& context, Parse::CallExprId parse_node) -> bool {
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// Process the final explicit call argument now, but leave the arguments
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// block on the stack until the end of this function.
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context.ParamOrArgEndNoPop(Parse::NodeKind::CallExprStart);
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auto discard_args_block = llvm::make_scope_exit(
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[&] { context.params_or_args_stack().PopAndDiscard(); });
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auto [call_expr_parse_node, callee_id] =
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context.node_stack().PopWithParseNode<Parse::NodeKind::CallExprStart>();
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auto diagnose_not_callable = [&, call_expr_parse_node = call_expr_parse_node,
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callee_id = callee_id] {
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auto callee_type_id = context.insts().Get(callee_id).type_id();
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if (callee_type_id != SemIR::TypeId::Error) {
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CARBON_DIAGNOSTIC(CallToNonCallable, Error,
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"Value of type `{0}` is not callable.", std::string);
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context.emitter().Emit(call_expr_parse_node, CallToNonCallable,
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context.sem_ir().StringifyType(callee_type_id));
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}
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context.node_stack().Push(parse_node, SemIR::InstId::BuiltinError);
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return true;
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};
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// For a method call, pick out the `self` value.
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auto function_callee_id = callee_id;
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SemIR::InstId self_id = SemIR::InstId::Invalid;
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if (auto bound_method =
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context.insts().Get(callee_id).TryAs<SemIR::BoundMethod>()) {
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self_id = bound_method->object_id;
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function_callee_id = bound_method->function_id;
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}
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// Identify the function we're calling.
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auto function_decl_id = context.GetConstantValue(function_callee_id);
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if (!function_decl_id.is_valid()) {
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return diagnose_not_callable();
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}
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auto function_decl =
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context.insts().Get(function_decl_id).TryAs<SemIR::FunctionDecl>();
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if (!function_decl) {
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return diagnose_not_callable();
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}
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auto function_id = function_decl->function_id;
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const auto& callable = context.functions().Get(function_id);
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// For functions with an implicit return type, the return type is the empty
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// tuple type.
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SemIR::TypeId type_id = callable.return_type_id;
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if (!type_id.is_valid()) {
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type_id = context.CanonicalizeTupleType(call_expr_parse_node, {});
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}
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// If there is a return slot, build storage for the result.
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SemIR::InstId return_storage_id = SemIR::InstId::Invalid;
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if (callable.return_slot_id.is_valid()) {
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// Tentatively put storage for a temporary in the function's return slot.
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// This will be replaced if necessary when we perform initialization.
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return_storage_id = context.AddInst(
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SemIR::TemporaryStorage{call_expr_parse_node, callable.return_type_id});
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}
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// Convert the arguments to match the parameters.
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auto converted_args_id =
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ConvertCallArgs(context, call_expr_parse_node, self_id,
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context.params_or_args_stack().PeekCurrentBlockContents(),
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return_storage_id, function_decl->parse_node,
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callable.implicit_param_refs_id, callable.param_refs_id);
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auto call_inst_id = context.AddInst(
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SemIR::Call{call_expr_parse_node, type_id, callee_id, converted_args_id});
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context.node_stack().Push(parse_node, call_inst_id);
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return true;
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}
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auto HandleCallExprComma(Context& context,
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Parse::CallExprCommaId /*parse_node*/) -> bool {
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context.ParamOrArgComma();
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return true;
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}
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auto HandleCallExprStart(Context& context, Parse::CallExprStartId parse_node)
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-> bool {
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auto name_id = context.node_stack().PopExpr();
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context.node_stack().Push(parse_node, name_id);
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context.ParamOrArgStart();
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return true;
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}
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} // namespace Carbon::Check
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