1 //===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===//
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 #include "llvm/CodeGen/MachineModuleInfo.h"
12 #include "llvm/Constants.h"
13 #include "llvm/Analysis/ValueTracking.h"
14 #include "llvm/CodeGen/MachineFunctionPass.h"
15 #include "llvm/CodeGen/MachineFunction.h"
16 #include "llvm/CodeGen/Passes.h"
17 #include "llvm/Target/TargetInstrInfo.h"
18 #include "llvm/Target/TargetMachine.h"
19 #include "llvm/Target/TargetOptions.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/GlobalVariable.h"
22 #include "llvm/Intrinsics.h"
23 #include "llvm/Instructions.h"
24 #include "llvm/Module.h"
25 #include "llvm/Support/Dwarf.h"
26 #include "llvm/Support/ErrorHandling.h"
28 using namespace llvm::dwarf;
30 // Handle the Pass registration stuff necessary to use TargetData's.
31 static RegisterPass<MachineModuleInfo>
32 X("machinemoduleinfo", "Module Information");
33 char MachineModuleInfo::ID = 0;
35 // Out of line virtual method.
36 MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
38 //===----------------------------------------------------------------------===//
40 MachineModuleInfo::MachineModuleInfo()
45 , DbgInfoAvailable(false) {
46 // Always emit some info, by default "no personality" info.
47 Personalities.push_back(NULL);
50 MachineModuleInfo::~MachineModuleInfo() {
54 /// doInitialization - Initialize the state for a new module.
56 bool MachineModuleInfo::doInitialization() {
60 /// doFinalization - Tear down the state after completion of a module.
62 bool MachineModuleInfo::doFinalization() {
66 /// EndFunction - Discard function meta information.
68 void MachineModuleInfo::EndFunction() {
69 // Clean up frame info.
72 // Clean up exception info.
79 VariableDbgInfo.clear();
82 /// AnalyzeModule - Scan the module for global debug information.
84 void MachineModuleInfo::AnalyzeModule(Module &M) {
85 // Insert functions in the llvm.used array (but not llvm.compiler.used) into
87 GlobalVariable *GV = M.getGlobalVariable("llvm.used");
88 if (!GV || !GV->hasInitializer()) return;
90 // Should be an array of 'i8*'.
91 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
92 if (InitList == 0) return;
94 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
96 dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts()))
97 UsedFunctions.insert(F);
100 //===-EH-------------------------------------------------------------------===//
102 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
103 /// specified MachineBasicBlock.
104 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
105 (MachineBasicBlock *LandingPad) {
106 unsigned N = LandingPads.size();
107 for (unsigned i = 0; i < N; ++i) {
108 LandingPadInfo &LP = LandingPads[i];
109 if (LP.LandingPadBlock == LandingPad)
113 LandingPads.push_back(LandingPadInfo(LandingPad));
114 return LandingPads[N];
117 /// addInvoke - Provide the begin and end labels of an invoke style call and
118 /// associate it with a try landing pad block.
119 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
120 unsigned BeginLabel, unsigned EndLabel) {
121 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
122 LP.BeginLabels.push_back(BeginLabel);
123 LP.EndLabels.push_back(EndLabel);
126 /// addLandingPad - Provide the label of a try LandingPad block.
128 unsigned MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
129 unsigned LandingPadLabel = NextLabelID();
130 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
131 LP.LandingPadLabel = LandingPadLabel;
132 return LandingPadLabel;
135 /// addPersonality - Provide the personality function for the exception
137 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
138 Function *Personality) {
139 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
140 LP.Personality = Personality;
142 for (unsigned i = 0; i < Personalities.size(); ++i)
143 if (Personalities[i] == Personality)
146 // If this is the first personality we're adding go
147 // ahead and add it at the beginning.
148 if (Personalities[0] == NULL)
149 Personalities[0] = Personality;
151 Personalities.push_back(Personality);
154 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
156 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
157 std::vector<GlobalVariable *> &TyInfo) {
158 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
159 for (unsigned N = TyInfo.size(); N; --N)
160 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
163 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
165 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
166 std::vector<GlobalVariable *> &TyInfo) {
167 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
168 std::vector<unsigned> IdsInFilter(TyInfo.size());
169 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
170 IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
171 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
174 /// addCleanup - Add a cleanup action for a landing pad.
176 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
177 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
178 LP.TypeIds.push_back(0);
181 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
183 void MachineModuleInfo::TidyLandingPads() {
184 for (unsigned i = 0; i != LandingPads.size(); ) {
185 LandingPadInfo &LandingPad = LandingPads[i];
186 LandingPad.LandingPadLabel = MappedLabel(LandingPad.LandingPadLabel);
188 // Special case: we *should* emit LPs with null LP MBB. This indicates
190 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
191 LandingPads.erase(LandingPads.begin() + i);
195 for (unsigned j=0; j != LandingPads[i].BeginLabels.size(); ) {
196 unsigned BeginLabel = MappedLabel(LandingPad.BeginLabels[j]);
197 unsigned EndLabel = MappedLabel(LandingPad.EndLabels[j]);
199 if (!BeginLabel || !EndLabel) {
200 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
201 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
205 LandingPad.BeginLabels[j] = BeginLabel;
206 LandingPad.EndLabels[j] = EndLabel;
210 // Remove landing pads with no try-ranges.
211 if (LandingPads[i].BeginLabels.empty()) {
212 LandingPads.erase(LandingPads.begin() + i);
216 // If there is no landing pad, ensure that the list of typeids is empty.
217 // If the only typeid is a cleanup, this is the same as having no typeids.
218 if (!LandingPad.LandingPadBlock ||
219 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
220 LandingPad.TypeIds.clear();
226 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
228 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
229 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
230 if (TypeInfos[i] == TI) return i + 1;
232 TypeInfos.push_back(TI);
233 return TypeInfos.size();
236 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is
238 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
239 // If the new filter coincides with the tail of an existing filter, then
240 // re-use the existing filter. Folding filters more than this requires
241 // re-ordering filters and/or their elements - probably not worth it.
242 for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
243 E = FilterEnds.end(); I != E; ++I) {
244 unsigned i = *I, j = TyIds.size();
247 if (FilterIds[--i] != TyIds[--j])
251 // The new filter coincides with range [i, end) of the existing filter.
257 // Add the new filter.
258 int FilterID = -(1 + FilterIds.size());
259 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
260 for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
261 FilterIds.push_back(TyIds[I]);
262 FilterEnds.push_back(FilterIds.size());
263 FilterIds.push_back(0); // terminator
267 /// getPersonality - Return the personality function for the current function.
268 Function *MachineModuleInfo::getPersonality() const {
269 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per
271 return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
274 /// getPersonalityIndex - Return unique index for current personality
275 /// function. NULL/first personality function should always get zero index.
276 unsigned MachineModuleInfo::getPersonalityIndex() const {
277 const Function* Personality = NULL;
279 // Scan landing pads. If there is at least one non-NULL personality - use it.
280 for (unsigned i = 0; i != LandingPads.size(); ++i)
281 if (LandingPads[i].Personality) {
282 Personality = LandingPads[i].Personality;
286 for (unsigned i = 0; i < Personalities.size(); ++i) {
287 if (Personalities[i] == Personality)
291 // This will happen if the current personality function is
292 // in the zero index.