1 //===- MIRPrintingPass.cpp - Pass that prints out using the MIR format ----===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements a pass that prints out the LLVM module using the MIR
11 // serialization format.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/CodeGen/Passes.h"
16 #include "llvm/CodeGen/MachineFunction.h"
17 #include "llvm/CodeGen/MachineFunctionPass.h"
18 #include "llvm/IR/Module.h"
19 #include "llvm/Support/Debug.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include "llvm/Support/YAMLTraits.h"
22 
23 using namespace llvm;
24 
25 namespace llvm {
26 namespace yaml {
27 
28 /// This struct serializes the LLVM IR module.
29 template <> struct BlockScalarTraits<Module> {
30   static void output(const Module &Mod, void *Ctxt, raw_ostream &OS) {
31     Mod.print(OS, nullptr);
32   }
33   static StringRef input(StringRef Str, void *Ctxt, Module &Mod) {
34     llvm_unreachable("LLVM Module is supposed to be parsed separately");
35     return "";
36   }
37 };
38 
39 } // end namespace yaml
40 } // end namespace llvm
41 
42 namespace {
43 
44 /// This pass prints out the LLVM IR to an output stream using the MIR
45 /// serialization format.
46 struct MIRPrintingPass : public MachineFunctionPass {
47   static char ID;
48   raw_ostream &OS;
49 
50   MIRPrintingPass() : MachineFunctionPass(ID), OS(dbgs()) {}
51   MIRPrintingPass(raw_ostream &OS) : MachineFunctionPass(ID), OS(OS) {}
52 
53   const char *getPassName() const override { return "MIR Printing Pass"; }
54 
55   void getAnalysisUsage(AnalysisUsage &AU) const override {
56     AU.setPreservesAll();
57     MachineFunctionPass::getAnalysisUsage(AU);
58   }
59 
60   virtual bool runOnMachineFunction(MachineFunction &MF) override {
61     // TODO: Print out the machine function.
62     return false;
63   }
64 
65   virtual bool doFinalization(Module &M) override {
66     yaml::Output Out(OS);
67     Out << M;
68     return false;
69   }
70 };
71 
72 char MIRPrintingPass::ID = 0;
73 
74 } // end anonymous namespace
75 
76 char &llvm::MIRPrintingPassID = MIRPrintingPass::ID;
77 INITIALIZE_PASS(MIRPrintingPass, "mir-printer", "MIR Printer", false, false)
78 
79 namespace llvm {
80 
81 MachineFunctionPass *createPrintMIRPass(raw_ostream &OS) {
82   return new MIRPrintingPass(OS);
83 }
84 
85 } // end namespace llvm
86