1 //===-- WebAssemblyAsmPrinter.cpp - WebAssembly LLVM assembly writer ------===//
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 /// \file
11 /// \brief This file contains a printer that converts from our internal
12 /// representation of machine-dependent LLVM code to the WebAssembly assembly
13 /// language.
14 ///
15 //===----------------------------------------------------------------------===//
16 
17 #include "WebAssembly.h"
18 #include "WebAssemblyMachineFunctionInfo.h"
19 #include "WebAssemblyRegisterInfo.h"
20 #include "WebAssemblySubtarget.h"
21 #include "InstPrinter/WebAssemblyInstPrinter.h"
22 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
23 
24 #include "llvm/ADT/SmallString.h"
25 #include "llvm/CodeGen/AsmPrinter.h"
26 #include "llvm/CodeGen/MachineInstr.h"
27 #include "llvm/IR/DataLayout.h"
28 #include "llvm/IR/DebugInfo.h"
29 #include "llvm/MC/MCStreamer.h"
30 #include "llvm/Support/Debug.h"
31 #include "llvm/Support/TargetRegistry.h"
32 #include "llvm/Support/raw_ostream.h"
33 
34 using namespace llvm;
35 
36 #define DEBUG_TYPE "asm-printer"
37 
38 namespace {
39 
40 class WebAssemblyAsmPrinter final : public AsmPrinter {
41 public:
42   WebAssemblyAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
43       : AsmPrinter(TM, std::move(Streamer)) {}
44 
45 private:
46   const char *getPassName() const override {
47     return "WebAssembly Assembly Printer";
48   }
49 
50   //===------------------------------------------------------------------===//
51   // MachineFunctionPass Implementation.
52   //===------------------------------------------------------------------===//
53 
54   void getAnalysisUsage(AnalysisUsage &AU) const override {
55     AsmPrinter::getAnalysisUsage(AU);
56   }
57 
58   bool runOnMachineFunction(MachineFunction &F) override {
59     return AsmPrinter::runOnMachineFunction(F);
60   }
61 
62   //===------------------------------------------------------------------===//
63   // AsmPrinter Implementation.
64   //===------------------------------------------------------------------===//
65 
66   void EmitInstruction(const MachineInstr *MI) override;
67 };
68 
69 } // end anonymous namespace
70 
71 //===----------------------------------------------------------------------===//
72 
73 void WebAssemblyAsmPrinter::EmitInstruction(const MachineInstr *MI) {
74   SmallString<128> Str;
75   raw_svector_ostream OS(Str);
76 
77   switch (MI->getOpcode()) {
78   default:
79     DEBUG(MI->print(dbgs()));
80     llvm_unreachable("Unhandled instruction");
81     break;
82   }
83 
84   OutStreamer->EmitRawText(OS.str());
85 }
86 
87 // Force static initialization.
88 extern "C" void LLVMInitializeWebAssemblyAsmPrinter() {
89   RegisterAsmPrinter<WebAssemblyAsmPrinter> X(TheWebAssemblyTarget32);
90   RegisterAsmPrinter<WebAssemblyAsmPrinter> Y(TheWebAssemblyTarget64);
91 }
92