mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Geoff RomerandChandler Carruth
49c7288619
- A function with a return declaration always has exactly one `ReturnSlotPattern`, representing the whole return declaration (whereas previously that was omitted for value and reference returns). - The `ReturnSlotPattern` always has a subpattern with the same form. `OutParamPattern` already plays that role for initializing forms, and `TuplePattern` will play that role for tuple forms. This change introduces `ValueReturnPattern` and `RefReturnPattern` to represent value and reference return forms. - As before, the `ReturnSlotPattern` has a corresponding `ReturnSlot` that represents the output that is initialized by a `return` statement. Its structure parallels the structure of the `ReturnSlotPattern`, so we need `ValueReturn` and `RefReturn` insts that correspond to `ValueReturnPattern` and `RefReturnPattern`. This is a step toward supporting generic return forms, where the `ReturnSlotPattern`'s subpattern may be an action: this change ensures that evaluating the action for a specific form produces the same SemIR as if the form were concrete to begin with. More speculatively, this should simplify the implementation of `return` statements with compound return forms. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
61 lines
2.3 KiB
C++
61 lines
2.3 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 "toolchain/check/global_init.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/inst.h"
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namespace Carbon::Check {
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auto GlobalInit::Resume() -> void {
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context_->inst_block_stack().Push(block_id_, block_);
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}
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auto GlobalInit::Suspend() -> void {
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// TODO: Consider splicing together blocks in order to avoid sizable copies
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// here.
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auto contents = context_->inst_block_stack().PeekCurrentBlockContents();
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block_.assign(contents.begin(), contents.end());
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block_id_ = context_->inst_block_stack().PeekOrAdd();
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context_->inst_block_stack().PopAndDiscard();
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}
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auto GlobalInit::Finalize() -> void {
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// __global_init is only added if there are initialization instructions.
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if (block_.empty() && block_id_ == SemIR::InstBlockId::GlobalInit) {
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return;
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}
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Resume();
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AddInst<SemIR::Return>(*context_, Parse::NodeId::None, {});
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// Pop the GlobalInit block here to finalize it.
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context_->inst_block_stack().Pop();
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auto name_id = context_->sem_ir().identifiers().Add("__global_init");
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context_->sem_ir().set_global_ctor_id(context_->sem_ir().functions().Add(
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{{.name_id = SemIR::NameId::ForIdentifier(name_id),
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.parent_scope_id = SemIR::NameScopeId::Package,
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.generic_id = SemIR::GenericId::None,
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.first_param_node_id = Parse::NodeId::None,
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.last_param_node_id = Parse::NodeId::None,
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.pattern_block_id = SemIR::InstBlockId::Empty,
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.implicit_param_patterns_id = SemIR::InstBlockId::None,
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.param_patterns_id = SemIR::InstBlockId::Empty,
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.is_extern = false,
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.extern_library_id = SemIR::LibraryNameId::None,
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.non_owning_decl_id = SemIR::InstId::None,
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.first_owning_decl_id = SemIR::InstId::None},
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{.call_param_patterns_id = SemIR::InstBlockId::Empty,
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.call_params_id = SemIR::InstBlockId::Empty,
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.call_param_ranges = SemIR::Function::CallParamIndexRanges::Empty,
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.return_type_inst_id = SemIR::TypeInstId::None,
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.return_form_inst_id = SemIR::InstId::None,
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.return_pattern_id = SemIR::InstId::None,
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.body_block_ids = {SemIR::InstBlockId::GlobalInit}}}));
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}
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} // namespace Carbon::Check
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