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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
//===-- GCMetadata.cpp - Garbage collector metadata -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the GCFunctionInfo class and GCModuleInfo pass.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class Printer : public FunctionPass {
static char ID;
raw_ostream &OS;
public:
explicit Printer(raw_ostream &OS) : FunctionPass(ID), OS(OS) {}
const char *getPassName() const override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnFunction(Function &F) override;
bool doFinalization(Module &M) override;
};
} // namespace
INITIALIZE_PASS(GCModuleInfo, "collector-metadata",
"Create Garbage Collector Module Metadata", false, false)
// -----------------------------------------------------------------------------
GCFunctionInfo::GCFunctionInfo(const Function &F, GCStrategy &S)
: F(F), S(S), FrameSize(~0LL) {}
GCFunctionInfo::~GCFunctionInfo() {}
// -----------------------------------------------------------------------------
char GCModuleInfo::ID = 0;
GCModuleInfo::GCModuleInfo() : ImmutablePass(ID) {
initializeGCModuleInfoPass(*PassRegistry::getPassRegistry());
}
GCFunctionInfo &GCModuleInfo::getFunctionInfo(const Function &F) {
assert(!F.isDeclaration() && "Can only get GCFunctionInfo for a definition!");
assert(F.hasGC());
finfo_map_type::iterator I = FInfoMap.find(&F);
if (I != FInfoMap.end())
return *I->second;
GCStrategy *S = getGCStrategy(F.getGC());
Functions.push_back(make_unique<GCFunctionInfo>(F, *S));
GCFunctionInfo *GFI = Functions.back().get();
FInfoMap[&F] = GFI;
return *GFI;
}
void GCModuleInfo::clear() {
Functions.clear();
FInfoMap.clear();
GCStrategyList.clear();
}
// -----------------------------------------------------------------------------
char Printer::ID = 0;
FunctionPass *llvm::createGCInfoPrinter(raw_ostream &OS) {
return new Printer(OS);
}
const char *Printer::getPassName() const {
return "Print Garbage Collector Information";
}
void Printer::getAnalysisUsage(AnalysisUsage &AU) const {
FunctionPass::getAnalysisUsage(AU);
AU.setPreservesAll();
AU.addRequired<GCModuleInfo>();
}
static const char *DescKind(GC::PointKind Kind) {
switch (Kind) {
case GC::PreCall:
return "pre-call";
case GC::PostCall:
return "post-call";
}
llvm_unreachable("Invalid point kind");
}
bool Printer::runOnFunction(Function &F) {
if (F.hasGC())
return false;
GCFunctionInfo *FD = &getAnalysis<GCModuleInfo>().getFunctionInfo(F);
OS << "GC roots for " << FD->getFunction().getName() << ":\n";
for (GCFunctionInfo::roots_iterator RI = FD->roots_begin(),
RE = FD->roots_end();
RI != RE; ++RI)
OS << "\t" << RI->Num << "\t" << RI->StackOffset << "[sp]\n";
OS << "GC safe points for " << FD->getFunction().getName() << ":\n";
for (GCFunctionInfo::iterator PI = FD->begin(), PE = FD->end(); PI != PE;
++PI) {
OS << "\t" << PI->Label->getName() << ": " << DescKind(PI->Kind)
<< ", live = {";
for (GCFunctionInfo::live_iterator RI = FD->live_begin(PI),
RE = FD->live_end(PI);
;) {
OS << " " << RI->Num;
if (++RI == RE)
break;
OS << ",";
}
OS << " }\n";
}
return false;
}
bool Printer::doFinalization(Module &M) {
GCModuleInfo *GMI = getAnalysisIfAvailable<GCModuleInfo>();
assert(GMI && "Printer didn't require GCModuleInfo?!");
GMI->clear();
return false;
}
GCStrategy *GCModuleInfo::getGCStrategy(const StringRef Name) {
// TODO: Arguably, just doing a linear search would be faster for small N
auto NMI = GCStrategyMap.find(Name);
if (NMI != GCStrategyMap.end())
return NMI->getValue();
for (auto& Entry : GCRegistry::entries()) {
if (Name == Entry.getName()) {
std::unique_ptr<GCStrategy> S = Entry.instantiate();
S->Name = Name;
GCStrategyMap[Name] = S.get();
GCStrategyList.push_back(std::move(S));
return GCStrategyList.back().get();
}
}
if (GCRegistry::begin() == GCRegistry::end()) {
// In normal operation, the registry should not be empty. There should
// be the builtin GCs if nothing else. The most likely scenario here is
// that we got here without running the initializers used by the Registry
// itself and it's registration mechanism.
const std::string error = ("unsupported GC: " + Name).str() +
" (did you remember to link and initialize the CodeGen library?)";
report_fatal_error(error);
} else
report_fatal_error(std::string("unsupported GC: ") + Name);
}
|
