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 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                                          CodeModel::Model CM,
45                                          CodeGenOpt::Level OL)
46     : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options), TT, CPU, FS,
47                         Options, getEffectiveRelocModel(RM), CM, OL),
48       TLOF(make_unique<TargetLoweringObjectFileELF>()),
49       Subtarget(TT, CPU, FS, *this) {
50   initAsmInfo();
51 }
52 
53 MSP430TargetMachine::~MSP430TargetMachine() {}
54 
55 namespace {
56 /// MSP430 Code Generator Pass Configuration Options.
57 class MSP430PassConfig : public TargetPassConfig {
58 public:
59   MSP430PassConfig(MSP430TargetMachine &TM, PassManagerBase &PM)
60     : TargetPassConfig(TM, PM) {}
61 
62   MSP430TargetMachine &getMSP430TargetMachine() const {
63     return getTM<MSP430TargetMachine>();
64   }
65 
66   bool addInstSelector() override;
67   void addPreEmitPass() override;
68 };
69 } // namespace
70 
71 TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
72   return new MSP430PassConfig(*this, PM);
73 }
74 
75 bool MSP430PassConfig::addInstSelector() {
76   // Install an instruction selector.
77   addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
78   return false;
79 }
80 
81 void MSP430PassConfig::addPreEmitPass() {
82   // Must run branch selection immediately preceding the asm printer.
83   addPass(createMSP430BranchSelectionPass(), false);
84 }
85