MachineCodeEmitter.cpp revision cf88d324a892c8f93ccdac55788afb48b17c728b 
1//===-- MachineCodeEmitter.cpp - Implement the MachineCodeEmitter itf -----===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the MachineCodeEmitter interface.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/MachineCodeEmitter.h"
15#include "llvm/CodeGen/MachineFunction.h"
16#include "llvm/Function.h"
17#include <fstream>
18#include <iostream>
19
20using namespace llvm;
21
22namespace {
23  struct DebugMachineCodeEmitter : public MachineCodeEmitter {
24    void startFunction(MachineFunction &F) {
25      std::cout << "\n**** Writing machine code for function: "
26                << F.getFunction()->getName() << "\n";
27    }
28    void finishFunction(MachineFunction &F) {
29      std::cout << "\n";
30    }
31    void startFunctionStub(unsigned StubSize) {
32      std::cout << "\n--- Function stub:\n";
33    }
34    void *finishFunctionStub(const Function *F) {
35      std::cout << "\n--- End of stub for Function\n";
36      return 0;
37    }
38
39    void emitByte(unsigned char B) {
40      std::cout << "0x" << std::hex << (unsigned int)B << std::dec << " ";
41    }
42    void emitWord(unsigned W) {
43      std::cout << "0x" << std::hex << W << std::dec << " ";
44    }
45    void emitWordAt(unsigned W, unsigned *Ptr) {
46      std::cout << "0x" << std::hex << W << std::dec << " (at "
47                << (void*) Ptr << ") ";
48    }
49
50    void addRelocation(const MachineRelocation &MR) {
51      std::cout << "<relocation> ";
52    }
53
54    uint64_t getConstantPoolEntryAddress(unsigned Num) { return 0; }
55    uint64_t getCurrentPCValue() { return 0; }
56    uint64_t getCurrentPCOffset() { return 0; }
57  };
58
59  class FilePrinterEmitter : public MachineCodeEmitter {
60    std::ofstream actual;
61    std::ostream &o;
62    MachineCodeEmitter &MCE;
63    unsigned counter;
64    unsigned values[4];
65
66  public:
67    FilePrinterEmitter(MachineCodeEmitter &M, std::ostream &os)
68      : o(os), MCE(M), counter(0) {
69      openActual();
70    }
71
72    ~FilePrinterEmitter() {
73      o << "\n";
74      actual.close();
75    }
76
77    void openActual() {
78      actual.open("lli.actual.obj");
79      if (!actual.good()) {
80        std::cerr << "Cannot open 'lli.actual.obj' for writing\n";
81        abort();
82      }
83    }
84
85    void startFunction(MachineFunction &F) {
86      // resolve any outstanding calls
87      MCE.startFunction(F);
88    }
89    void finishFunction(MachineFunction &F) {
90      MCE.finishFunction(F);
91    }
92
93    void emitConstantPool(MachineConstantPool *MCP) {
94      MCE.emitConstantPool(MCP);
95    }
96
97    void startFunctionStub(unsigned StubSize) {
98      MCE.startFunctionStub(StubSize);
99    }
100
101    void *finishFunctionStub(const Function *F) {
102      return MCE.finishFunctionStub(F);
103    }
104
105    void emitByte(unsigned char B) {
106      MCE.emitByte(B);
107      actual << B; actual.flush();
108
109      values[counter] = (unsigned int) B;
110      if (++counter % 4 == 0 && counter != 0) {
111        o << std::hex;
112        for (unsigned i=0; i<4; ++i) {
113          if (values[i] < 16) o << "0";
114          o << values[i] << " ";
115        }
116
117        o << std::dec << "\t";
118        for (unsigned i=0; i<4; ++i) {
119          for (int j=7; j>=0; --j) {
120            o << ((values[i] >> j) & 1);
121          }
122          o << " ";
123        }
124
125        o << "\n";
126
127        unsigned instr = 0;
128        for (unsigned i=0; i<4; ++i)
129          instr |= values[i] << (i*8);
130
131        o << "--- * --- * --- * --- * ---\n";
132        counter %= 4;
133      }
134    }
135
136    void emitWord(unsigned W) {
137      MCE.emitWord(W);
138    }
139    void emitWordAt(unsigned W, unsigned *Ptr) {
140      MCE.emitWordAt(W, Ptr);
141    }
142    uint64_t getConstantPoolEntryAddress(unsigned Num) {
143      return MCE.getConstantPoolEntryAddress(Num);
144    }
145    uint64_t getCurrentPCValue() {
146      return MCE.getCurrentPCValue();
147    }
148    uint64_t getCurrentPCOffset() {
149      return MCE.getCurrentPCOffset();
150    }
151    void addRelocation(const MachineRelocation &MR) {
152      return MCE.addRelocation(MR);
153    }
154  };
155}
156
157/// createDebugMachineCodeEmitter - Return a dynamically allocated machine
158/// code emitter, which just prints the opcodes and fields out the cout.  This
159/// can be used for debugging users of the MachineCodeEmitter interface.
160///
161MachineCodeEmitter *
162MachineCodeEmitter::createDebugEmitter() {
163  return new DebugMachineCodeEmitter();
164}
165
166MachineCodeEmitter *
167MachineCodeEmitter::createFilePrinterEmitter(MachineCodeEmitter &MCE) {
168  return new FilePrinterEmitter(MCE, std::cerr);
169}
170