LLVM  12.0.0git
ARCAsmPrinter.cpp
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1 //===- ARCAsmPrinter.cpp - ARC LLVM assembly writer -------------*- C++ -*-===//
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 contains a printer that converts from our internal representation
10 // of machine-dependent LLVM code to GNU format ARC assembly language.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "ARC.h"
15 #include "ARCMCInstLower.h"
16 #include "ARCSubtarget.h"
17 #include "ARCTargetMachine.h"
22 #include "llvm/MC/MCAsmInfo.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCStreamer.h"
27 
28 using namespace llvm;
29 
30 #define DEBUG_TYPE "asm-printer"
31 
32 namespace {
33 
34 class ARCAsmPrinter : public AsmPrinter {
35  ARCMCInstLower MCInstLowering;
36 
37 public:
38  explicit ARCAsmPrinter(TargetMachine &TM,
39  std::unique_ptr<MCStreamer> Streamer)
40  : AsmPrinter(TM, std::move(Streamer)),
41  MCInstLowering(&OutContext, *this) {}
42 
43  StringRef getPassName() const override { return "ARC Assembly Printer"; }
44  void emitInstruction(const MachineInstr *MI) override;
45 
46  bool runOnMachineFunction(MachineFunction &MF) override;
47 };
48 
49 } // end anonymous namespace
50 
51 void ARCAsmPrinter::emitInstruction(const MachineInstr *MI) {
52  SmallString<128> Str;
54 
55  switch (MI->getOpcode()) {
56  case ARC::DBG_VALUE:
57  llvm_unreachable("Should be handled target independently");
58  break;
59  }
60 
61  MCInst TmpInst;
62  MCInstLowering.Lower(MI, TmpInst);
63  EmitToStreamer(*OutStreamer, TmpInst);
64 }
65 
66 bool ARCAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
67  // Functions are 4-byte aligned.
68  MF.ensureAlignment(Align(4));
70 }
71 
72 // Force static initialization.
75 }
constexpr char Align[]
Key for Kernel::Arg::Metadata::mAlign.
static GCMetadataPrinterRegistry::Add< ErlangGCPrinter > X("erlang", "erlang-compatible garbage collector")
This class represents lattice values for constants.
Definition: AllocatorList.h:23
This class is used to lower an MachineInstr into an MCInst.
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:550
Target & getTheARCTarget()
LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCAsmPrinter()
unsigned getOpcode() const
Returns the opcode of this MachineInstr.
Definition: MachineInstr.h:456
bool runOnMachineFunction(MachineFunction &MF) override
Emit the specified function out to the OutStreamer.
Definition: AsmPrinter.h:322
RegisterAsmPrinter - Helper template for registering a target specific assembly printer, for use in the target machine initialization function.
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:158
void ensureAlignment(Align A)
ensureAlignment - Make sure the function is at least A bytes aligned.
This file contains the declaration of the ARCInstPrinter class, which is used to print ARC MCInst to ...
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:81
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
#define LLVM_EXTERNAL_VISIBILITY
Definition: Compiler.h:131
Representation of each machine instruction.
Definition: MachineInstr.h:62
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:65
IRTranslator LLVM IR MI
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:57