1 //===-- DebugInfoProbe.cpp - DebugInfo Probe ------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements DebugInfoProbe. This probe can be used by a pass
11 // manager to analyze how optimizer is treating debugging information.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "debuginfoprobe"
16 #include "llvm/DebugInfoProbe.h"
17 #include "llvm/Function.h"
18 #include "llvm/IntrinsicInst.h"
19 #include "llvm/Metadata.h"
20 #include "llvm/PassManager.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/Debug.h"
23 #include "llvm/Support/DebugLoc.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/ADT/StringRef.h"
32 EnableDebugInfoProbe("enable-debug-info-probe", cl::Hidden,
33 cl::desc("Enable debug info probe"));
35 // CreateInfoOutputFile - Return a file stream to print our output on.
36 namespace llvm { extern raw_ostream *CreateInfoOutputFile(); }
38 //===----------------------------------------------------------------------===//
39 // DebugInfoProbeImpl - This class implements a interface to monitor
40 // how an optimization pass is preserving debugging information.
44 class DebugInfoProbeImpl {
46 DebugInfoProbeImpl() : NumDbgLineLost(0),NumDbgValueLost(0) {}
47 void initialize(StringRef PName, Function &F);
48 void finalize(Function &F);
51 unsigned NumDbgLineLost, NumDbgValueLost;
54 std::set<MDNode *> DbgVariables;
55 std::set<Instruction *> MissingDebugLoc;
59 //===----------------------------------------------------------------------===//
62 /// initialize - Collect information before running an optimization pass.
63 void DebugInfoProbeImpl::initialize(StringRef PName, Function &F) {
64 if (!EnableDebugInfoProbe) return;
70 for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
71 for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
73 if (BI->getDebugLoc().isUnknown())
74 MissingDebugLoc.insert(BI);
75 if (!isa<DbgInfoIntrinsic>(BI)) continue;
78 if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI)) {
79 Addr = DDI->getAddress();
80 Node = DDI->getVariable();
81 } else if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(BI)) {
82 Addr = DVI->getValue();
83 Node = DVI->getVariable();
86 DbgVariables.insert(Node);
90 /// report - Report findings. This should be invoked after finalize.
91 void DebugInfoProbeImpl::report() {
92 if (!EnableDebugInfoProbe) return;
93 if (NumDbgLineLost || NumDbgValueLost) {
94 raw_ostream *OutStream = CreateInfoOutputFile();
96 *OutStream << NumDbgLineLost
97 << "\t times line number info lost by "
100 *OutStream << NumDbgValueLost
101 << "\t times variable info lost by "
109 /// finalize - Collect information after running an optimization pass. This
110 /// must be used after initialization.
111 void DebugInfoProbeImpl::finalize(Function &F) {
112 if (!EnableDebugInfoProbe) return;
113 assert (TheFn == &F && "Invalid function to measure!");
115 std::set<MDNode *>DbgVariables2;
116 for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
117 for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
119 if (BI->getDebugLoc().isUnknown() &&
120 MissingDebugLoc.count(BI) == 0) {
122 DEBUG(dbgs() << "DebugInfoProbe (" << PassName << "): --- ");
123 DEBUG(BI->print(dbgs()));
124 DEBUG(dbgs() << "\n");
126 if (!isa<DbgInfoIntrinsic>(BI)) continue;
129 if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(BI)) {
130 Addr = DDI->getAddress();
131 Node = DDI->getVariable();
132 } else if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(BI)) {
133 Addr = DVI->getValue();
134 Node = DVI->getVariable();
137 DbgVariables2.insert(Node);
140 for (std::set<MDNode *>::iterator I = DbgVariables.begin(),
141 E = DbgVariables.end(); I != E; ++I) {
142 if (DbgVariables2.count(*I) == 0 && (*I)->getNumOperands() >= 2) {
146 << "): Losing dbg info for variable: ";
147 if (MDString *MDS = dyn_cast_or_null<MDString>(
148 (*I)->getOperand(2)))
149 dbgs() << MDS->getString();
158 //===----------------------------------------------------------------------===//
161 DebugInfoProbe::DebugInfoProbe() {
162 pImpl = new DebugInfoProbeImpl();
165 DebugInfoProbe::~DebugInfoProbe() {
169 /// initialize - Collect information before running an optimization pass.
170 void DebugInfoProbe::initialize(StringRef PName, Function &F) {
171 pImpl->initialize(PName, F);
174 /// finalize - Collect information after running an optimization pass. This
175 /// must be used after initialization.
176 void DebugInfoProbe::finalize(Function &F) {
180 /// report - Report findings. This should be invoked after finalize.
181 void DebugInfoProbe::report() {
185 //===----------------------------------------------------------------------===//
186 // DebugInfoProbeInfo
188 /// ~DebugInfoProbeInfo - Report data collected by all probes before deleting
190 DebugInfoProbeInfo::~DebugInfoProbeInfo() {
191 if (!EnableDebugInfoProbe) return;
192 for (StringMap<DebugInfoProbe*>::iterator I = Probes.begin(),
193 E = Probes.end(); I != E; ++I) {
199 /// initialize - Collect information before running an optimization pass.
200 void DebugInfoProbeInfo::initialize(Pass *P, Function &F) {
201 if (!EnableDebugInfoProbe) return;
202 if (P->getAsPMDataManager())
205 StringMapEntry<DebugInfoProbe *> &Entry =
206 Probes.GetOrCreateValue(P->getPassName());
207 DebugInfoProbe *&Probe = Entry.getValue();
209 Probe = new DebugInfoProbe();
210 Probe->initialize(P->getPassName(), F);
213 /// finalize - Collect information after running an optimization pass. This
214 /// must be used after initialization.
215 void DebugInfoProbeInfo::finalize(Pass *P, Function &F) {
216 if (!EnableDebugInfoProbe) return;
217 if (P->getAsPMDataManager())
219 StringMapEntry<DebugInfoProbe *> &Entry =
220 Probes.GetOrCreateValue(P->getPassName());
221 DebugInfoProbe *&Probe = Entry.getValue();
222 assert (Probe && "DebugInfoProbe is not initialized!");