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https://github.com/carbon-language/carbon-lang.git
synced 2026-11-15 08:08:31 +00:00
Richard Smith
d50576ca16
When building an expression referencing the result of name lookup, if the lookup result is non-constant then check we can access it from the current scope. * If it is a global, then use a new `GlobalRef` instruction to get the value of that global. In lowering, create global variables to hold the values of global `let` bindings so that `GlobalRef` can access those values. * If it is a local, walk the lexical scopes between it and the point of use and ensure it is usable through from all of them. Error if there's an intervening declarative scope such as a class, add a TODO to handle captures for intervening functions, and allow `typeof(...)` to name things it can't read the value of since it's unevaluated. Global `let`s (which includes `let`s at class scope) now also have their initializers collected into the global inits block. If the initializer is non-constant, the wrapper binding also lives in the global inits block; otherwise it continues to live in the file block and the variable emitted for it is a global constant. Assisted-by: Gemini and Claude via Antigravity
67 lines
2.5 KiB
C++
67 lines
2.5 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/class.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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auto UseGlobalInit(Context& context) -> bool {
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return context.scope_stack().PeekIndex() == ScopeIndex::Package ||
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InStaticClassScopeVar(context) || InClassScopeLet(context);
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}
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} // namespace Carbon::Check
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