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(TheMSP430Target);
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 MSP430TargetMachine::MSP430TargetMachine(const Target &T, const Triple &TT,
36                                          StringRef CPU, StringRef FS,
37                                          const TargetOptions &Options,
38                                          Optional<Reloc::Model> RM,
39                                          CodeModel::Model CM,
40                                          CodeGenOpt::Level OL)
41     : LLVMTargetMachine(T, "e-m:e-p:16:16-i32:16:32-a:16-n8:16", TT, CPU, FS,
42                         Options, getEffectiveRelocModel(RM), CM, OL),
43       TLOF(make_unique<TargetLoweringObjectFileELF>()),
44       // FIXME: Check DataLayout string.
45       Subtarget(TT, CPU, FS, *this) {
46   initAsmInfo();
47 }
48 
49 MSP430TargetMachine::~MSP430TargetMachine() {}
50 
51 namespace {
52 /// MSP430 Code Generator Pass Configuration Options.
53 class MSP430PassConfig : public TargetPassConfig {
54 public:
55   MSP430PassConfig(MSP430TargetMachine *TM, PassManagerBase &PM)
56     : TargetPassConfig(TM, PM) {}
57 
58   MSP430TargetMachine &getMSP430TargetMachine() const {
59     return getTM<MSP430TargetMachine>();
60   }
61 
62   bool addInstSelector() override;
63   void addPreEmitPass() override;
64 };
65 } // namespace
66 
67 TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
68   return new MSP430PassConfig(this, PM);
69 }
70 
71 bool MSP430PassConfig::addInstSelector() {
72   // Install an instruction selector.
73   addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
74   return false;
75 }
76 
77 void MSP430PassConfig::addPreEmitPass() {
78   // Must run branch selection immediately preceding the asm printer.
79   addPass(createMSP430BranchSelectionPass(), false);
80 }
81