1 //===-- MSP430TargetMachine.cpp - Define TargetMachine for MSP430 ---------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Top-level implementation for the MSP430 target.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "MSP430TargetMachine.h"
14 #include "MSP430.h"
15 #include "TargetInfo/MSP430TargetInfo.h"
16 #include "llvm/CodeGen/Passes.h"
17 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
18 #include "llvm/CodeGen/TargetPassConfig.h"
19 #include "llvm/IR/LegacyPassManager.h"
20 #include "llvm/MC/MCAsmInfo.h"
21 #include "llvm/MC/TargetRegistry.h"
22 using namespace llvm;
23 
24 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430Target() {
25   // Register the target.
26   RegisterTargetMachine<MSP430TargetMachine> X(getTheMSP430Target());
27 }
28 
29 static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
30   return RM.value_or(Reloc::Static);
31 }
32 
33 static std::string computeDataLayout(const Triple &TT, StringRef CPU,
34                                      const TargetOptions &Options) {
35   return "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16";
36 }
37 
38 MSP430TargetMachine::MSP430TargetMachine(const Target &T, const Triple &TT,
39                                          StringRef CPU, StringRef FS,
40                                          const TargetOptions &Options,
41                                          Optional<Reloc::Model> RM,
42                                          Optional<CodeModel::Model> CM,
43                                          CodeGenOpt::Level OL, bool JIT)
44     : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options), TT, CPU, FS,
45                         Options, getEffectiveRelocModel(RM),
46                         getEffectiveCodeModel(CM, CodeModel::Small), OL),
47       TLOF(std::make_unique<TargetLoweringObjectFileELF>()),
48       Subtarget(TT, std::string(CPU), std::string(FS), *this) {
49   initAsmInfo();
50 }
51 
52 MSP430TargetMachine::~MSP430TargetMachine() = default;
53 
54 namespace {
55 /// MSP430 Code Generator Pass Configuration Options.
56 class MSP430PassConfig : public TargetPassConfig {
57 public:
58   MSP430PassConfig(MSP430TargetMachine &TM, PassManagerBase &PM)
59     : TargetPassConfig(TM, PM) {}
60 
61   MSP430TargetMachine &getMSP430TargetMachine() const {
62     return getTM<MSP430TargetMachine>();
63   }
64 
65   bool addInstSelector() override;
66   void addPreEmitPass() override;
67 };
68 } // namespace
69 
70 TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
71   return new MSP430PassConfig(*this, PM);
72 }
73 
74 bool MSP430PassConfig::addInstSelector() {
75   // Install an instruction selector.
76   addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
77   return false;
78 }
79 
80 void MSP430PassConfig::addPreEmitPass() {
81   // Must run branch selection immediately preceding the asm printer.
82   addPass(createMSP430BranchSelectionPass());
83 }
84