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/Support/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   if (!RM.hasValue())
31     return Reloc::Static;
32   return *RM;
33 }
34 
35 static std::string computeDataLayout(const Triple &TT, StringRef CPU,
36                                      const TargetOptions &Options) {
37   return "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16";
38 }
39 
40 MSP430TargetMachine::MSP430TargetMachine(const Target &T, const Triple &TT,
41                                          StringRef CPU, StringRef FS,
42                                          const TargetOptions &Options,
43                                          Optional<Reloc::Model> RM,
44                                          Optional<CodeModel::Model> CM,
45                                          CodeGenOpt::Level OL, bool JIT)
46     : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options), TT, CPU, FS,
47                         Options, getEffectiveRelocModel(RM),
48                         getEffectiveCodeModel(CM, CodeModel::Small), OL),
49       TLOF(std::make_unique<TargetLoweringObjectFileELF>()),
50       Subtarget(TT, std::string(CPU), std::string(FS), *this) {
51   initAsmInfo();
52 }
53 
54 MSP430TargetMachine::~MSP430TargetMachine() {}
55 
56 namespace {
57 /// MSP430 Code Generator Pass Configuration Options.
58 class MSP430PassConfig : public TargetPassConfig {
59 public:
60   MSP430PassConfig(MSP430TargetMachine &TM, PassManagerBase &PM)
61     : TargetPassConfig(TM, PM) {}
62 
63   MSP430TargetMachine &getMSP430TargetMachine() const {
64     return getTM<MSP430TargetMachine>();
65   }
66 
67   bool addInstSelector() override;
68   void addPreEmitPass() override;
69 };
70 } // namespace
71 
72 TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
73   return new MSP430PassConfig(*this, PM);
74 }
75 
76 bool MSP430PassConfig::addInstSelector() {
77   // Install an instruction selector.
78   addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
79   return false;
80 }
81 
82 void MSP430PassConfig::addPreEmitPass() {
83   // Must run branch selection immediately preceding the asm printer.
84   addPass(createMSP430BranchSelectionPass(), false);
85 }
86