LLVM  9.0.0svn
AVRTargetMachine.cpp
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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"
18 #include "llvm/IR/Module.h"
20 
21 #include "AVR.h"
22 #include "AVRTargetObjectFile.h"
24 
25 namespace llvm {
26 
27 static const char *AVRDataLayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8";
28 
29 /// Processes a CPU name.
30 static StringRef getCPU(StringRef CPU) {
31  if (CPU.empty() || CPU == "generic") {
32  return "avr2";
33  }
34 
35  return CPU;
36 }
37 
39  return RM.hasValue() ? *RM : Reloc::Static;
40 }
41 
43  StringRef CPU, StringRef FS,
44  const TargetOptions &Options,
47  CodeGenOpt::Level OL, bool JIT)
48  : LLVMTargetMachine(T, AVRDataLayout, TT, getCPU(CPU), FS, Options,
50  getEffectiveCodeModel(CM, CodeModel::Small), OL),
51  SubTarget(TT, getCPU(CPU), FS, *this) {
52  this->TLOF = make_unique<AVRTargetObjectFile>();
53  initAsmInfo();
54 }
55 
56 namespace {
57 /// AVR Code Generator Pass Configuration Options.
58 class AVRPassConfig : public TargetPassConfig {
59 public:
60  AVRPassConfig(AVRTargetMachine &TM, PassManagerBase &PM)
61  : TargetPassConfig(TM, PM) {}
62 
63  AVRTargetMachine &getAVRTargetMachine() const {
64  return getTM<AVRTargetMachine>();
65  }
66 
67  bool addInstSelector() override;
68  void addPreSched2() override;
69  void addPreEmitPass() override;
70  void addPreRegAlloc() override;
71 };
72 } // namespace
73 
75  return new AVRPassConfig(*this, PM);
76 }
77 
78 extern "C" void LLVMInitializeAVRTarget() {
79  // Register the target.
81 
82  auto &PR = *PassRegistry::getPassRegistry();
85 }
86 
88  return &SubTarget;
89 }
90 
92  return &SubTarget;
93 }
94 
95 //===----------------------------------------------------------------------===//
96 // Pass Pipeline Configuration
97 //===----------------------------------------------------------------------===//
98 
99 bool AVRPassConfig::addInstSelector() {
100  // Install an instruction selector.
101  addPass(createAVRISelDag(getAVRTargetMachine(), getOptLevel()));
102  // Create the frame analyzer pass used by the PEI pass.
103  addPass(createAVRFrameAnalyzerPass());
104 
105  return false;
106 }
107 
108 void AVRPassConfig::addPreRegAlloc() {
109  // Create the dynalloc SP save/restore pass to handle variable sized allocas.
110  addPass(createAVRDynAllocaSRPass());
111 }
112 
113 void AVRPassConfig::addPreSched2() {
114  addPass(createAVRRelaxMemPass());
115  addPass(createAVRExpandPseudoPass());
116 }
117 
118 void AVRPassConfig::addPreEmitPass() {
119  // Must run branch selection immediately preceding the asm printer.
120  addPass(&BranchRelaxationPassID);
121 }
122 
123 } // end of namespace llvm
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
CodeModel::Model getEffectiveCodeModel(Optional< CodeModel::Model > CM, CodeModel::Model Default)
Helper method for getting the code model, returning Default if CM does not have a value...
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
This class represents lattice values for constants.
Definition: AllocatorList.h:23
char & BranchRelaxationPassID
BranchRelaxation - This pass replaces branches that need to jump further than is supported by a branc...
const AVRSubtarget * getSubtargetImpl() const
Target & getTheAVRTarget()
FunctionPass * createAVRRelaxMemPass()
LLVM_NODISCARD bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:126
Target-Independent Code Generator Pass Configuration Options.
A generic AVR implementation.
RegisterTargetMachine - Helper template for registering a target machine implementation, for use in the target machine initialization function.
void LLVMInitializeAVRTarget()
void initializeAVRRelaxMemPass(PassRegistry &)
CodeGenOpt::Level getOptLevel() const
Returns the optimization level: None, Less, Default, or Aggressive.
static Reloc::Model getEffectiveRelocModel(Optional< Reloc::Model > RM)
AVRTargetMachine(const Target &T, const Triple &TT, StringRef CPU, StringRef FS, const TargetOptions &Options, Optional< Reloc::Model > RM, Optional< CodeModel::Model > CM, CodeGenOpt::Level OL, bool JIT)
TargetPassConfig * createPassConfig(PassManagerBase &PM) override
Create a pass configuration object to be used by addPassToEmitX methods for generating a pipeline of ...
This class describes a target machine that is implemented with the LLVM target-independent code gener...
FunctionPass * createAVRISelDag(AVRTargetMachine &TM, CodeGenOpt::Level OptLevel)
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
PassManagerBase - An abstract interface to allow code to add passes to a pass manager without having ...
Module.h This file contains the declarations for the Module class.
Target - Wrapper for Target specific information.
A specific AVR target MCU.
Definition: AVRSubtarget.h:31
FunctionPass * createAVRExpandPseudoPass()
bool hasValue() const
Definition: Optional.h:259
static const char * AVRDataLayout
static StringRef getCPU(StringRef CPU)
Processes a CPU name.
FunctionPass * createAVRFrameAnalyzerPass()
Creates instance of the frame analyzer pass.
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
void initializeAVRExpandPseudoPass(PassRegistry &)
FunctionPass * createAVRDynAllocaSRPass()
createAVRDynAllocaSRPass - returns an instance of the dynalloca stack pointer save/restore pass...