mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Richard Smith
e91840e1b6
In preparation for lowering information from multiple `SemIR::File`s into a single `llvm::Module`. The primary purpose of this is to support lowering a local specific for an imported generic function, where the instructions for the generic function are in a different file than the instructions for the specific. See #5475 for a draft PR implementing that functionality on top of this. The per-`llvm::Module` state now lives in `Lower::Context`, and `Lower::FileContext` tracks only the per-`SemIR::File` information. `Lower::Context` should not mention any `SemIR` IDs that are file-specific. For now, the C++ lowering and the specific coalescing logic are kept per-file for simplicity.
89 lines
3.6 KiB
C++
89 lines
3.6 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/lower/context.h"
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#include "common/check.h"
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#include "common/vlog.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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#include "toolchain/lower/file_context.h"
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#include "toolchain/sem_ir/inst_namer.h"
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namespace Carbon::Lower {
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Context::Context(llvm::LLVMContext& llvm_context,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs,
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std::optional<llvm::ArrayRef<Parse::GetTreeAndSubtreesFn>>
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tree_and_subtrees_getters_for_debug_info,
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llvm::StringRef module_name, llvm::raw_ostream* vlog_stream)
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: llvm_context_(&llvm_context),
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llvm_module_(std::make_unique<llvm::Module>(module_name, llvm_context)),
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file_system_(std::move(fs)),
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di_builder_(*llvm_module_),
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di_compile_unit_(
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tree_and_subtrees_getters_for_debug_info
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? BuildDICompileUnit(module_name, *llvm_module_, di_builder_)
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: nullptr),
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tree_and_subtrees_getters_for_debug_info_(
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tree_and_subtrees_getters_for_debug_info),
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vlog_stream_(vlog_stream) {}
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auto Context::GetFileContext(const SemIR::File* file,
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const SemIR::InstNamer* inst_namer)
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-> FileContext& {
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auto insert_result = file_contexts_.Insert(file->check_ir_id(), [&] {
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auto file_context =
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std::make_unique<FileContext>(*this, *file, inst_namer, vlog_stream_);
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file_context->PrepareToLower();
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return file_context;
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});
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return *insert_result.value();
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}
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auto Context::Finalize() && -> std::unique_ptr<llvm::Module> {
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file_contexts_.ForEach(
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[](auto, auto& file_context) { file_context->Finalize(); });
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return std::move(llvm_module_);
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}
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auto Context::BuildDICompileUnit(llvm::StringRef module_name,
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llvm::Module& llvm_module,
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llvm::DIBuilder& di_builder)
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-> llvm::DICompileUnit* {
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llvm_module.addModuleFlag(llvm::Module::Max, "Dwarf Version", 5);
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llvm_module.addModuleFlag(llvm::Module::Warning, "Debug Info Version",
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llvm::DEBUG_METADATA_VERSION);
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// TODO: Include directory path in the compile_unit_file.
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llvm::DIFile* compile_unit_file = di_builder.createFile(module_name, "");
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// TODO: Introduce a new language code for Carbon. C works well for now since
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// it's something debuggers will already know/have support for at least.
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// Probably have to bump to C++ at some point for virtual functions,
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// templates, etc.
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return di_builder.createCompileUnit(llvm::dwarf::DW_LANG_C, compile_unit_file,
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"carbon",
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/*isOptimized=*/false, /*Flags=*/"",
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/*RV=*/0);
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}
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auto Context::GetLocForDI(SemIR::AbsoluteNodeId abs_node_id) -> LocForDI {
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const auto& tree_and_subtrees =
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(*tree_and_subtrees_getters_for_debug_info_)[abs_node_id.check_ir_id()
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.index]();
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const auto& tokens = tree_and_subtrees.tree().tokens();
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if (abs_node_id.node_id().has_value()) {
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auto token =
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tree_and_subtrees.GetSubtreeTokenRange(abs_node_id.node_id()).begin;
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return {.filename = tokens.source().filename(),
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.line_number = tokens.GetLineNumber(token),
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.column_number = tokens.GetColumnNumber(token)};
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} else {
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return {.filename = tokens.source().filename(),
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.line_number = 0,
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.column_number = 0};
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}
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}
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} // namespace Carbon::Lower
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