1 //===-- MSP430TargetMachine.cpp - Define TargetMachine for MSP430 ---------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Top-level implementation for the MSP430 target.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "MSP430TargetMachine.h"
15 #include "MSP430.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" 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 CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM) {
36   if (CM)
37     return *CM;
38   return CodeModel::Small;
39 }
40 
41 static std::string computeDataLayout(const Triple &TT, StringRef CPU,
42                                      const TargetOptions &Options) {
43   return "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16";
44 }
45 
46 MSP430TargetMachine::MSP430TargetMachine(const Target &T, const Triple &TT,
47                                          StringRef CPU, StringRef FS,
48                                          const TargetOptions &Options,
49                                          Optional<Reloc::Model> RM,
50                                          Optional<CodeModel::Model> CM,
51                                          CodeGenOpt::Level OL, bool JIT)
52     : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options), TT, CPU, FS,
53                         Options, getEffectiveRelocModel(RM),
54                         getEffectiveCodeModel(CM), OL),
55       TLOF(make_unique<TargetLoweringObjectFileELF>()),
56       Subtarget(TT, CPU, FS, *this) {
57   initAsmInfo();
58 }
59 
60 MSP430TargetMachine::~MSP430TargetMachine() {}
61 
62 namespace {
63 /// MSP430 Code Generator Pass Configuration Options.
64 class MSP430PassConfig : public TargetPassConfig {
65 public:
66   MSP430PassConfig(MSP430TargetMachine &TM, PassManagerBase &PM)
67     : TargetPassConfig(TM, PM) {}
68 
69   MSP430TargetMachine &getMSP430TargetMachine() const {
70     return getTM<MSP430TargetMachine>();
71   }
72 
73   bool addInstSelector() override;
74   void addPreEmitPass() override;
75 };
76 } // namespace
77 
78 TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
79   return new MSP430PassConfig(*this, PM);
80 }
81 
82 bool MSP430PassConfig::addInstSelector() {
83   // Install an instruction selector.
84   addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
85   return false;
86 }
87 
88 void MSP430PassConfig::addPreEmitPass() {
89   // Must run branch selection immediately preceding the asm printer.
90   addPass(createMSP430BranchSelectionPass(), false);
91 }
92