1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
//===- llvm-extract.cpp - LLVM function extraction utility ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility changes the input module to only contain a single function,
// which is primarily used for debugging transformations.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compressor.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Signals.h"
#include <iostream>
#include <memory>
#include <fstream>
using namespace llvm;
cl::opt<bool> Bitcode("bitcode");
// InputFilename - The filename to read from.
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
cl::init("-"), cl::value_desc("filename"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Specify output filename"),
cl::value_desc("filename"), cl::init("-"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
DeleteFn("delete", cl::desc("Delete specified function from Module"));
static cl::opt<bool>
Relink("relink",
cl::desc("Turn external linkage for callees of function to delete"));
// ExtractFunc - The function to extract from the module... defaults to main.
static cl::opt<std::string>
ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
cl::value_desc("function"));
int main(int argc, char **argv) {
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
sys::PrintStackTraceOnErrorSignal();
std::auto_ptr<Module> M;
if (Bitcode) {
MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(&InputFilename[0],
InputFilename.size());
if (Buffer == 0) {
cerr << "Error reading file '" + InputFilename + "'";
return 1;
} else {
M.reset(ParseBitcodeFile(Buffer));
}
delete Buffer;
} else {
M.reset(ParseBytecodeFile(InputFilename,
Compressor::decompressToNewBuffer));
}
if (M.get() == 0) {
cerr << argv[0] << ": bytecode didn't read correctly.\n";
return 1;
}
// Figure out which function we should extract
Function *F = M.get()->getFunction(ExtractFunc);
if (F == 0) {
cerr << argv[0] << ": program doesn't contain function named '"
<< ExtractFunc << "'!\n";
return 1;
}
// In addition to deleting all other functions, we also want to spiff it
// up a little bit. Do this now.
PassManager Passes;
Passes.add(new TargetData(M.get())); // Use correct TargetData
// Either isolate the function or delete it from the Module
Passes.add(createFunctionExtractionPass(F, DeleteFn, Relink));
if (!DeleteFn)
Passes.add(createGlobalDCEPass()); // Delete unreachable globals
Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
Passes.add(createStripDeadPrototypesPass()); // Remove dead func decls
std::ostream *Out = 0;
if (OutputFilename != "-") { // Not stdout?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
std::ios::binary;
Out = new std::ofstream(OutputFilename.c_str(), io_mode);
} else { // Specified stdout
// FIXME: cout is not binary!
Out = &std::cout;
}
OStream L(*Out);
if (Bitcode)
Passes.add(CreateBitcodeWriterPass(*Out));
else
Passes.add(new WriteBytecodePass(&L)); // Write bytecode to file...
Passes.run(*M.get());
if (Out != &std::cout)
delete Out;
return 0;
}
|
