mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-11-15 21:38:10 +00:00
Richard Smith
d63fceff8e
This removes the risk of accidentally performing a vector copy when calling these functions, and is a preparation step towards the new node block allocation design. This required changing how we build call expressions. Instead of finishing the argument block and then later adding a return slot, we now delay finishing the argument block and checking for conversions to parameter types until after we've added the return slot to it.
83 lines
3.2 KiB
C++
83 lines
3.2 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "toolchain/check/context.h"
|
|
#include "toolchain/sem_ir/node.h"
|
|
|
|
namespace Carbon::Check {
|
|
|
|
auto HandleCallExpression(Context& context, Parse::Node parse_node) -> bool {
|
|
// Process the final explicit call argument, but leave the arguments block on
|
|
// the stack until we add the return slot argument.
|
|
context.ParamOrArgEndNoPop(
|
|
/*for_args=*/true, Parse::NodeKind::CallExpressionStart);
|
|
|
|
// TODO: Convert to call expression.
|
|
auto [call_expr_parse_node, name_id] =
|
|
context.node_stack()
|
|
.PopWithParseNode<Parse::NodeKind::CallExpressionStart>();
|
|
auto name_node = context.semantics_ir().GetNode(name_id);
|
|
if (name_node.kind() != SemIR::NodeKind::FunctionDeclaration) {
|
|
// TODO: Work on error.
|
|
context.TODO(parse_node, "Not a callable name");
|
|
context.node_stack().Push(parse_node, name_id);
|
|
context.ParamOrArgPop();
|
|
return true;
|
|
}
|
|
|
|
auto function_id = name_node.GetAsFunctionDeclaration();
|
|
const auto& callable = context.semantics_ir().GetFunction(function_id);
|
|
|
|
// For functions with an implicit return type, the return type is the empty
|
|
// tuple type.
|
|
SemIR::TypeId type_id = callable.return_type_id;
|
|
if (!type_id.is_valid()) {
|
|
type_id = context.CanonicalizeTupleType(call_expr_parse_node, {});
|
|
}
|
|
|
|
// If there is a return slot, add a corresponding argument.
|
|
if (callable.return_slot_id.is_valid()) {
|
|
// Tentatively put storage for a temporary in the function's return slot.
|
|
// This will be replaced if necessary when we perform initialization.
|
|
context.AddNodeAndPush(parse_node,
|
|
SemIR::Node::TemporaryStorage::Make(
|
|
call_expr_parse_node, callable.return_type_id));
|
|
// TODO: We pass for_args=false here because we don't want a StubReference.
|
|
// We should remove the StubReferences for arguments and the corresponding
|
|
// `for_args` parameter. They didn't turn out to be used for anything.
|
|
context.ParamOrArgSave(/*for_args=*/false);
|
|
}
|
|
|
|
// Convert the arguments to match the parameters.
|
|
auto refs_id = context.ParamOrArgPop();
|
|
if (!context.ImplicitAsForArgs(call_expr_parse_node, refs_id,
|
|
name_node.parse_node(), callable.param_refs_id,
|
|
callable.return_slot_id.is_valid())) {
|
|
context.node_stack().Push(parse_node, SemIR::NodeId::BuiltinError);
|
|
return true;
|
|
}
|
|
|
|
auto call_node_id = context.AddNode(SemIR::Node::Call::Make(
|
|
call_expr_parse_node, type_id, refs_id, function_id));
|
|
|
|
context.node_stack().Push(parse_node, call_node_id);
|
|
return true;
|
|
}
|
|
|
|
auto HandleCallExpressionComma(Context& context, Parse::Node /*parse_node*/)
|
|
-> bool {
|
|
context.ParamOrArgComma(/*for_args=*/true);
|
|
return true;
|
|
}
|
|
|
|
auto HandleCallExpressionStart(Context& context, Parse::Node parse_node)
|
|
-> bool {
|
|
auto name_id = context.node_stack().PopExpression();
|
|
context.node_stack().Push(parse_node, name_id);
|
|
context.ParamOrArgStart();
|
|
return true;
|
|
}
|
|
|
|
} // namespace Carbon::Check
|