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 "MSP430MachineFunctionInfo.h"
16 #include "TargetInfo/MSP430TargetInfo.h"
17 #include "llvm/CodeGen/Passes.h"
18 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
19 #include "llvm/CodeGen/TargetPassConfig.h"
20 #include "llvm/MC/MCAsmInfo.h"
21 #include "llvm/MC/TargetRegistry.h"
22 #include <optional>
23 using namespace llvm;
24 
25 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMSP430Target() {
26   // Register the target.
27   RegisterTargetMachine<MSP430TargetMachine> X(getTheMSP430Target());
28   PassRegistry &PR = *PassRegistry::getPassRegistry();
29   initializeMSP430DAGToDAGISelPass(PR);
30 }
31 
32 static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM) {
33   return RM.value_or(Reloc::Static);
34 }
35 
36 static std::string computeDataLayout(const Triple &TT, StringRef CPU,
37                                      const TargetOptions &Options) {
38   return "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16";
39 }
40 
41 MSP430TargetMachine::MSP430TargetMachine(const Target &T, const Triple &TT,
42                                          StringRef CPU, StringRef FS,
43                                          const TargetOptions &Options,
44                                          std::optional<Reloc::Model> RM,
45                                          std::optional<CodeModel::Model> CM,
46                                          CodeGenOpt::Level OL, bool JIT)
47     : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options), TT, CPU, FS,
48                         Options, getEffectiveRelocModel(RM),
49                         getEffectiveCodeModel(CM, CodeModel::Small), OL),
50       TLOF(std::make_unique<TargetLoweringObjectFileELF>()),
51       Subtarget(TT, std::string(CPU), std::string(FS), *this) {
52   initAsmInfo();
53 }
54 
55 MSP430TargetMachine::~MSP430TargetMachine() = default;
56 
57 namespace {
58 /// MSP430 Code Generator Pass Configuration Options.
59 class MSP430PassConfig : public TargetPassConfig {
60 public:
61   MSP430PassConfig(MSP430TargetMachine &TM, PassManagerBase &PM)
62     : TargetPassConfig(TM, PM) {}
63 
64   MSP430TargetMachine &getMSP430TargetMachine() const {
65     return getTM<MSP430TargetMachine>();
66   }
67 
68   bool addInstSelector() override;
69   void addPreEmitPass() override;
70 };
71 } // namespace
72 
73 TargetPassConfig *MSP430TargetMachine::createPassConfig(PassManagerBase &PM) {
74   return new MSP430PassConfig(*this, PM);
75 }
76 
77 MachineFunctionInfo *MSP430TargetMachine::createMachineFunctionInfo(
78     BumpPtrAllocator &Allocator, const Function &F,
79     const TargetSubtargetInfo *STI) const {
80   return MSP430MachineFunctionInfo::create<MSP430MachineFunctionInfo>(Allocator,
81                                                                       F, STI);
82 }
83 
84 bool MSP430PassConfig::addInstSelector() {
85   // Install an instruction selector.
86   addPass(createMSP430ISelDag(getMSP430TargetMachine(), getOptLevel()));
87   return false;
88 }
89 
90 void MSP430PassConfig::addPreEmitPass() {
91   // Must run branch selection immediately preceding the asm printer.
92   addPass(createMSP430BranchSelectionPass());
93 }
94