mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-29 19:04:59 +01:00
aa69a484eb
Adds a flag `--optimize=<mode>` that specifies what to optimize for: * `--optimize=none` turns off the optimizer as much as possible, but still respects always_inline. * `--optimize=debug` aims to be the equivalent of `-Og` / `-O1`, and provides optimizations that don't affect the ability to debug the program. This is the default. * `--optimize=size` optimizes for the size of the produced program, and aims to be the equivalent of `-Oz`. * `--optimize=speed` optimizes for the execution time of the produced program, and aims to be the equivalent of `-O3`. Following the approach taken by Clang, the optimization level feeds into both the configuration of the LLVM pass pipeline and the attributes added to function definitions generated by the frontend. Optimization is performed in a new phase, `optimize`, which runs between `lower` and `codegen`. --------- Co-authored-by: Dana Jansens <danakj@orodu.net> Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
109 lines
4.0 KiB
C++
109 lines
4.0 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/lower/context.h"
|
|
|
|
#include "common/check.h"
|
|
#include "common/growing_range.h"
|
|
#include "common/raw_string_ostream.h"
|
|
#include "common/vlog.h"
|
|
#include "llvm/Transforms/Utils/ModuleUtils.h"
|
|
#include "toolchain/lower/file_context.h"
|
|
#include "toolchain/sem_ir/inst_namer.h"
|
|
|
|
namespace Carbon::Lower {
|
|
|
|
Context::Context(
|
|
llvm::LLVMContext* llvm_context,
|
|
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> fs, bool want_debug_info,
|
|
const Parse::GetTreeAndSubtreesStore* tree_and_subtrees_getters,
|
|
llvm::StringRef module_name, int total_ir_count,
|
|
Lower::OptimizationLevel opt_level, llvm::raw_ostream* vlog_stream)
|
|
: llvm_context_(llvm_context),
|
|
llvm_module_(std::make_unique<llvm::Module>(module_name, *llvm_context)),
|
|
file_system_(std::move(fs)),
|
|
opt_level_(opt_level),
|
|
di_builder_(*llvm_module_),
|
|
di_compile_unit_(
|
|
want_debug_info
|
|
? BuildDICompileUnit(module_name, *llvm_module_, di_builder_)
|
|
: nullptr),
|
|
tree_and_subtrees_getters_(tree_and_subtrees_getters),
|
|
vlog_stream_(vlog_stream),
|
|
total_ir_count_(total_ir_count),
|
|
file_contexts_(
|
|
FileContextStore::MakeForOverwriteWithExplicitSize(total_ir_count_)) {
|
|
}
|
|
|
|
auto Context::GetFileContext(const SemIR::File* file,
|
|
const SemIR::InstNamer* inst_namer)
|
|
-> FileContext& {
|
|
auto& file_context = file_contexts_.Get(file->check_ir_id());
|
|
if (!file_context) {
|
|
file_context =
|
|
std::make_unique<FileContext>(*this, *file, inst_namer, vlog_stream_);
|
|
file_context->PrepareToLower();
|
|
}
|
|
return *file_context;
|
|
}
|
|
|
|
auto Context::LowerPendingDefinitions() -> void {
|
|
// Lower function definitions for generics.
|
|
for (auto [file_context, function_id, specific_id] :
|
|
GrowingRange(specific_function_definitions_)) {
|
|
file_context->BuildFunctionDefinition(function_id, specific_id);
|
|
}
|
|
}
|
|
|
|
auto Context::Finalize() && -> std::unique_ptr<llvm::Module> {
|
|
LowerPendingDefinitions();
|
|
|
|
for (auto& file_context : file_contexts_.values()) {
|
|
if (file_context) {
|
|
file_context->Finalize();
|
|
}
|
|
}
|
|
|
|
return std::move(llvm_module_);
|
|
}
|
|
|
|
auto Context::BuildDICompileUnit(llvm::StringRef module_name,
|
|
llvm::Module& llvm_module,
|
|
llvm::DIBuilder& di_builder)
|
|
-> llvm::DICompileUnit* {
|
|
llvm_module.addModuleFlag(llvm::Module::Max, "Dwarf Version", 5);
|
|
llvm_module.addModuleFlag(llvm::Module::Warning, "Debug Info Version",
|
|
llvm::DEBUG_METADATA_VERSION);
|
|
// TODO: Include directory path in the compile_unit_file.
|
|
llvm::DIFile* compile_unit_file = di_builder.createFile(module_name, "");
|
|
// TODO: Introduce a new language code for Carbon. C works well for now since
|
|
// it's something debuggers will already know/have support for at least.
|
|
// Probably have to bump to C++ at some point for virtual functions,
|
|
// templates, etc.
|
|
return di_builder.createCompileUnit(llvm::dwarf::DW_LANG_C, compile_unit_file,
|
|
"carbon",
|
|
/*isOptimized=*/false, /*Flags=*/"",
|
|
/*RV=*/0);
|
|
}
|
|
|
|
auto Context::GetLocForDI(SemIR::AbsoluteNodeId abs_node_id) -> LocForDI {
|
|
const auto& tree_and_subtrees =
|
|
tree_and_subtrees_getters().Get(abs_node_id.check_ir_id())();
|
|
const auto& tokens = tree_and_subtrees.tree().tokens();
|
|
|
|
if (abs_node_id.node_id().has_value()) {
|
|
auto token =
|
|
tree_and_subtrees.GetSubtreeTokenRange(abs_node_id.node_id()).begin;
|
|
return {.filename = tokens.source().filename(),
|
|
.line_number = tokens.GetLineNumber(token),
|
|
.column_number = tokens.GetColumnNumber(token)};
|
|
} else {
|
|
return {.filename = tokens.source().filename(),
|
|
.line_number = 0,
|
|
.column_number = 0};
|
|
}
|
|
}
|
|
|
|
} // namespace Carbon::Lower
|