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https://github.com/carbon-language/carbon-lang.git
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68 lines
2.1 KiB
C++
68 lines
2.1 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/codegen/codegen.h"
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#include <memory>
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#include <optional>
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#include <string>
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/MC/TargetRegistry.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/TargetParser/Host.h"
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namespace Carbon {
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auto CodeGen::Make(llvm::Module* module, llvm::StringRef target_triple_str,
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llvm::raw_pwrite_stream* errors) -> std::optional<CodeGen> {
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std::string error;
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const llvm::Target* target =
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llvm::TargetRegistry::lookupTarget(target_triple_str, error);
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if (!target) {
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*errors << "error: invalid target: " << error << "\n";
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return {};
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}
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llvm::Triple target_triple(target_triple_str);
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module->setTargetTriple(target_triple);
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constexpr llvm::StringLiteral CPU = "generic";
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constexpr llvm::StringLiteral Features = "";
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llvm::TargetOptions target_opts;
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CodeGen codegen(module, errors);
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codegen.target_machine_.reset(target->createTargetMachine(
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target_triple, CPU, Features, target_opts, llvm::Reloc::PIC_));
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return codegen;
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}
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auto CodeGen::EmitAssembly(llvm::raw_pwrite_stream& out) -> bool {
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return EmitCode(out, llvm::CodeGenFileType::AssemblyFile);
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}
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auto CodeGen::EmitObject(llvm::raw_pwrite_stream& out) -> bool {
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return EmitCode(out, llvm::CodeGenFileType::ObjectFile);
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}
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auto CodeGen::EmitCode(llvm::raw_pwrite_stream& out,
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llvm::CodeGenFileType file_type) -> bool {
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module_->setDataLayout(target_machine_->createDataLayout());
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// Using the legacy PM to generate the assembly since the new PM
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// does not work with this yet.
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// TODO: Make the new PM work with the codegen pipeline.
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llvm::legacy::PassManager pass;
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// Note that this returns true on an error.
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if (target_machine_->addPassesToEmitFile(pass, out, nullptr, file_type)) {
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*errors_ << "error: unable to emit to this file\n";
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return false;
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}
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pass.run(*module_);
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return true;
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}
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} // namespace Carbon
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