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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>
54 lines
1.8 KiB
C++
54 lines
1.8 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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#ifndef CARBON_TOOLCHAIN_CODEGEN_CODEGEN_H_
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#define CARBON_TOOLCHAIN_CODEGEN_CODEGEN_H_
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#include "llvm/IR/Module.h"
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#include "llvm/Target/TargetMachine.h"
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#include "toolchain/diagnostics/diagnostic_consumer.h"
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#include "toolchain/diagnostics/file_diagnostics.h"
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namespace Carbon {
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class CodeGen {
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public:
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// `module`, `target_machine`, and `consumer` must not be null.
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explicit CodeGen(llvm::Module* module, llvm::TargetMachine* target_machine,
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Diagnostics::Consumer* consumer)
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: module_(module), target_machine_(target_machine), emitter_(consumer) {}
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// Generates the object code file.
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// Returns false in case of failure, and any information about the failure is
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// printed to the error stream.
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//
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// Note this requires a `pwrite` stream to allow patching the output.
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auto EmitObject(llvm::raw_pwrite_stream& out) -> bool;
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// Prints the assembly to stdout.
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// Returns false in case of failure, and any information about the failure is
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// printed to the error stream.
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//
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// Note this requires a `pwrite` stream to allow patching the output.
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auto EmitAssembly(llvm::raw_pwrite_stream& out) -> bool;
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private:
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// Using the llvm pass emits either assembly or object code to dest.
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// Returns false in case of failure, and any information about the failure is
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// printed to the error stream.
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auto EmitCode(llvm::raw_pwrite_stream& out, llvm::CodeGenFileType file_type)
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-> bool;
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llvm::Module* module_;
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llvm::TargetMachine* target_machine_;
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// The emitter for diagnostics.
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Diagnostics::FileEmitter emitter_;
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};
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_CODEGEN_CODEGEN_H_
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