1 //===-- AVRTargetMachine.cpp - Define TargetMachine for AVR ---------------===//
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 // This file defines the AVR specific subclass of TargetMachine.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "AVRTargetMachine.h"
14
15 #include "llvm/CodeGen/Passes.h"
16 #include "llvm/CodeGen/TargetPassConfig.h"
17 #include "llvm/IR/Module.h"
18 #include "llvm/MC/TargetRegistry.h"
19
20 #include "AVR.h"
21 #include "AVRMachineFunctionInfo.h"
22 #include "AVRTargetObjectFile.h"
23 #include "MCTargetDesc/AVRMCTargetDesc.h"
24 #include "TargetInfo/AVRTargetInfo.h"
25
26 #include <optional>
27
28 namespace llvm {
29
30 static const char *AVRDataLayout =
31 "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8";
32
33 /// Processes a CPU name.
getCPU(StringRef CPU)34 static StringRef getCPU(StringRef CPU) {
35 if (CPU.empty() || CPU == "generic") {
36 return "avr2";
37 }
38
39 return CPU;
40 }
41
getEffectiveRelocModel(std::optional<Reloc::Model> RM)42 static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM) {
43 return RM.value_or(Reloc::Static);
44 }
45
AVRTargetMachine(const Target & T,const Triple & TT,StringRef CPU,StringRef FS,const TargetOptions & Options,std::optional<Reloc::Model> RM,std::optional<CodeModel::Model> CM,CodeGenOptLevel OL,bool JIT)46 AVRTargetMachine::AVRTargetMachine(const Target &T, const Triple &TT,
47 StringRef CPU, StringRef FS,
48 const TargetOptions &Options,
49 std::optional<Reloc::Model> RM,
50 std::optional<CodeModel::Model> CM,
51 CodeGenOptLevel OL, bool JIT)
52 : LLVMTargetMachine(T, AVRDataLayout, TT, getCPU(CPU), FS, Options,
53 getEffectiveRelocModel(RM),
54 getEffectiveCodeModel(CM, CodeModel::Small), OL),
55 SubTarget(TT, std::string(getCPU(CPU)), std::string(FS), *this) {
56 this->TLOF = std::make_unique<AVRTargetObjectFile>();
57 initAsmInfo();
58 }
59
60 namespace {
61 /// AVR Code Generator Pass Configuration Options.
62 class AVRPassConfig : public TargetPassConfig {
63 public:
AVRPassConfig(AVRTargetMachine & TM,PassManagerBase & PM)64 AVRPassConfig(AVRTargetMachine &TM, PassManagerBase &PM)
65 : TargetPassConfig(TM, PM) {}
66
getAVRTargetMachine() const67 AVRTargetMachine &getAVRTargetMachine() const {
68 return getTM<AVRTargetMachine>();
69 }
70
71 void addIRPasses() override;
72 bool addInstSelector() override;
73 void addPreSched2() override;
74 void addPreEmitPass() override;
75 };
76 } // namespace
77
createPassConfig(PassManagerBase & PM)78 TargetPassConfig *AVRTargetMachine::createPassConfig(PassManagerBase &PM) {
79 return new AVRPassConfig(*this, PM);
80 }
81
addIRPasses()82 void AVRPassConfig::addIRPasses() {
83 // Expand instructions like
84 // %result = shl i32 %n, %amount
85 // to a loop so that library calls are avoided.
86 addPass(createAVRShiftExpandPass());
87
88 TargetPassConfig::addIRPasses();
89 }
90
LLVMInitializeAVRTarget()91 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRTarget() {
92 // Register the target.
93 RegisterTargetMachine<AVRTargetMachine> X(getTheAVRTarget());
94
95 auto &PR = *PassRegistry::getPassRegistry();
96 initializeAVRExpandPseudoPass(PR);
97 initializeAVRShiftExpandPass(PR);
98 initializeAVRDAGToDAGISelLegacyPass(PR);
99 }
100
getSubtargetImpl() const101 const AVRSubtarget *AVRTargetMachine::getSubtargetImpl() const {
102 return &SubTarget;
103 }
104
getSubtargetImpl(const Function &) const105 const AVRSubtarget *AVRTargetMachine::getSubtargetImpl(const Function &) const {
106 return &SubTarget;
107 }
108
createMachineFunctionInfo(BumpPtrAllocator & Allocator,const Function & F,const TargetSubtargetInfo * STI) const109 MachineFunctionInfo *AVRTargetMachine::createMachineFunctionInfo(
110 BumpPtrAllocator &Allocator, const Function &F,
111 const TargetSubtargetInfo *STI) const {
112 return AVRMachineFunctionInfo::create<AVRMachineFunctionInfo>(Allocator, F,
113 STI);
114 }
115
116 //===----------------------------------------------------------------------===//
117 // Pass Pipeline Configuration
118 //===----------------------------------------------------------------------===//
119
addInstSelector()120 bool AVRPassConfig::addInstSelector() {
121 // Install an instruction selector.
122 addPass(createAVRISelDag(getAVRTargetMachine(), getOptLevel()));
123 // Create the frame analyzer pass used by the PEI pass.
124 addPass(createAVRFrameAnalyzerPass());
125
126 return false;
127 }
128
addPreSched2()129 void AVRPassConfig::addPreSched2() {
130 addPass(createAVRExpandPseudoPass());
131 }
132
addPreEmitPass()133 void AVRPassConfig::addPreEmitPass() {
134 // Must run branch selection immediately preceding the asm printer.
135 addPass(&BranchRelaxationPassID);
136 }
137
138 } // end of namespace llvm
139