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"
18 #include "MCTargetDesc/ARCInstPrinter.h"
19 #include "TargetInfo/ARCTargetInfo.h"
20 #include "llvm/CodeGen/AsmPrinter.h"
21 #include "llvm/CodeGen/MachineInstr.h"
22 #include "llvm/MC/MCAsmInfo.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/MC/TargetRegistry.h"
26 #include "llvm/Support/raw_ostream.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   ARC_MC::verifyInstructionPredicates(MI->getOpcode(),
53                                       getSubtargetInfo().getFeatureBits());
54 
55   SmallString<128> Str;
56   raw_svector_ostream O(Str);
57 
58   switch (MI->getOpcode()) {
59   case ARC::DBG_VALUE:
60     llvm_unreachable("Should be handled target independently");
61     break;
62   }
63 
64   MCInst TmpInst;
65   MCInstLowering.Lower(MI, TmpInst);
66   EmitToStreamer(*OutStreamer, TmpInst);
67 }
68 
69 bool ARCAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
70   // Functions are 4-byte aligned.
71   MF.ensureAlignment(Align(4));
72   return AsmPrinter::runOnMachineFunction(MF);
73 }
74 
75 // Force static initialization.
76 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCAsmPrinter() {
77   RegisterAsmPrinter<ARCAsmPrinter> X(getTheARCTarget());
78 }
79