mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
David Blaikie
bb9942823f
This helps at least lldb handle calling functions (currently the debug
info describes every function as `void()`, so no parameters or return
values are supported) - seems gdb and lldb both depend on demangling to
varying degrees in C code (marking a function as "prototyped" in C in
DWARF does seem to also address this problem).
Given:
```
fn PrintThree() {
Core.Print(3);
}
```
Before:
```
(lldb) p PrintThree()
error: Couldn't look up symbols:
PrintThree
Hint: The expression tried to call a function that is not present in
the target, perhaps because it was optimized out by the compiler.
```
After:
```
(lldb) p PrintThree()
3
(lldb)
```
107 lines
4.0 KiB
C++
107 lines
4.0 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/growing_range.h"
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#include "common/raw_string_ostream.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(
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llvm::LLVMContext* llvm_context,
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llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs, bool want_debug_info,
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const Parse::GetTreeAndSubtreesStore* tree_and_subtrees_getters,
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llvm::StringRef module_name, int total_ir_count,
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Lower::OptimizationLevel opt_level, 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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opt_level_(opt_level),
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di_builder_(*llvm_module_),
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di_compile_unit_(
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want_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_(tree_and_subtrees_getters),
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vlog_stream_(vlog_stream),
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total_ir_count_(total_ir_count),
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file_contexts_(
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FileContextStore::MakeForOverwriteWithExplicitSize(total_ir_count_)) {
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}
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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& file_context = file_contexts_.Get(file->check_ir_id());
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if (!file_context) {
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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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}
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return *file_context;
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}
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auto Context::LowerPendingDefinitions() -> void {
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// Lower function definitions for generics.
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for (auto [file_context, function_id, specific_id] :
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GrowingRange(specific_function_definitions_)) {
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file_context->BuildFunctionDefinition(function_id, specific_id);
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}
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}
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auto Context::Finalize() && -> std::unique_ptr<llvm::Module> {
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LowerPendingDefinitions();
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for (auto& file_context : file_contexts_.values()) {
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if (file_context) {
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file_context->Finalize();
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}
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}
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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
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// since it's something debuggers will already know/have support for at least.
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return di_builder.createCompileUnit(llvm::dwarf::DW_LANG_C_plus_plus,
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compile_unit_file, "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().Get(abs_node_id.check_ir_id())();
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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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