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
|
//===- MachineCFGPrinter.cpp - DOT Printer for Machine Functions ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//
// This file defines the `-dot-machine-cfg` analysis pass, which emits
// Machine Function in DOT format in file titled `<prefix>.<function-name>.dot.
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineCFGPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/PassRegistry.h"
#include "llvm/Support/GraphWriter.h"
using namespace llvm;
#define DEBUG_TYPE "dot-machine-cfg"
static cl::opt<std::string>
MCFGFuncName("mcfg-func-name", cl::Hidden,
cl::desc("The name of a function (or its substring)"
" whose CFG is viewed/printed."));
static cl::opt<std::string> MCFGDotFilenamePrefix(
"mcfg-dot-filename-prefix", cl::Hidden,
cl::desc("The prefix used for the Machine CFG dot file names."));
static cl::opt<bool>
CFGOnly("dot-mcfg-only", cl::init(false), cl::Hidden,
cl::desc("Print only the CFG without blocks body"));
static void writeMCFGToDotFile(MachineFunction &MF) {
std::string Filename =
(MCFGDotFilenamePrefix + "." + MF.getName() + ".dot").str();
errs() << "Writing '" << Filename << "'...";
std::error_code EC;
raw_fd_ostream File(Filename, EC, sys::fs::OF_Text);
DOTMachineFuncInfo MCFGInfo(&MF);
if (!EC)
WriteGraph(File, &MCFGInfo, CFGOnly);
else
errs() << " error opening file for writing!";
errs() << '\n';
}
namespace {
class MachineCFGPrinter : public MachineFunctionPass {
public:
static char ID;
MachineCFGPrinter();
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
MachineFunctionPass::getAnalysisUsage(AU);
}
};
} // namespace
char MachineCFGPrinter::ID = 0;
char &llvm::MachineCFGPrinterID = MachineCFGPrinter::ID;
INITIALIZE_PASS(MachineCFGPrinter, DEBUG_TYPE, "Machine CFG Printer Pass",
false, true)
/// Default construct and initialize the pass.
MachineCFGPrinter::MachineCFGPrinter() : MachineFunctionPass(ID) {
initializeMachineCFGPrinterPass(*PassRegistry::getPassRegistry());
}
bool MachineCFGPrinter::runOnMachineFunction(MachineFunction &MF) {
if (!MCFGFuncName.empty() && !MF.getName().contains(MCFGFuncName))
return false;
errs() << "Writing Machine CFG for function ";
errs().write_escaped(MF.getName()) << '\n';
writeMCFGToDotFile(MF);
return false;
}
|
