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/DerivedTypes.h"
14 #include "llvm/GlobalVariable.h"
15 #include "llvm/Intrinsics.h"
16 #include "llvm/Instructions.h"
17 #include "llvm/Module.h"
18 #include "llvm/Analysis/ValueTracking.h"
19 #include "llvm/CodeGen/MachineFunctionPass.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/Passes.h"
22 #include "llvm/Target/TargetInstrInfo.h"
23 #include "llvm/Target/TargetMachine.h"
24 #include "llvm/Target/TargetOptions.h"
25 #include "llvm/MC/MCSymbol.h"
26 #include "llvm/Support/Dwarf.h"
27 #include "llvm/Support/ErrorHandling.h"
29 using namespace llvm::dwarf;
31 // Handle the Pass registration stuff necessary to use TargetData's.
32 static RegisterPass<MachineModuleInfo>
33 X("machinemoduleinfo", "Machine Module Information");
34 char MachineModuleInfo::ID = 0;
36 // Out of line virtual method.
37 MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
39 //===----------------------------------------------------------------------===//
41 MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI)
42 : ImmutablePass(&ID), Context(MAI),
44 CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0), DbgInfoAvailable(false){
45 // Always emit some info, by default "no personality" info.
46 Personalities.push_back(NULL);
49 MachineModuleInfo::MachineModuleInfo()
50 : ImmutablePass(&ID), Context(*(MCAsmInfo*)0) {
51 assert(0 && "This MachineModuleInfo constructor should never be called, MMI "
52 "should always be explicitly constructed by LLVMTargetMachine");
56 MachineModuleInfo::~MachineModuleInfo() {
60 /// doInitialization - Initialize the state for a new module.
62 bool MachineModuleInfo::doInitialization() {
66 /// doFinalization - Tear down the state after completion of a module.
68 bool MachineModuleInfo::doFinalization() {
72 /// EndFunction - Discard function meta information.
74 void MachineModuleInfo::EndFunction() {
75 // Clean up frame info.
78 // Clean up exception info.
86 VariableDbgInfo.clear();
89 /// AnalyzeModule - Scan the module for global debug information.
91 void MachineModuleInfo::AnalyzeModule(Module &M) {
92 // Insert functions in the llvm.used array (but not llvm.compiler.used) into
94 GlobalVariable *GV = M.getGlobalVariable("llvm.used");
95 if (!GV || !GV->hasInitializer()) return;
97 // Should be an array of 'i8*'.
98 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
99 if (InitList == 0) return;
101 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
103 dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts()))
104 UsedFunctions.insert(F);
107 //===-EH-------------------------------------------------------------------===//
109 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
110 /// specified MachineBasicBlock.
111 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
112 (MachineBasicBlock *LandingPad) {
113 unsigned N = LandingPads.size();
114 for (unsigned i = 0; i < N; ++i) {
115 LandingPadInfo &LP = LandingPads[i];
116 if (LP.LandingPadBlock == LandingPad)
120 LandingPads.push_back(LandingPadInfo(LandingPad));
121 return LandingPads[N];
124 /// addInvoke - Provide the begin and end labels of an invoke style call and
125 /// associate it with a try landing pad block.
126 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
127 MCSymbol *BeginLabel, MCSymbol *EndLabel) {
128 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
129 LP.BeginLabels.push_back(BeginLabel);
130 LP.EndLabels.push_back(EndLabel);
133 /// addLandingPad - Provide the label of a try LandingPad block.
135 MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
136 MCSymbol *LandingPadLabel = Context.CreateTempSymbol();
137 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
138 LP.LandingPadLabel = LandingPadLabel;
139 return LandingPadLabel;
142 /// addPersonality - Provide the personality function for the exception
144 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
145 Function *Personality) {
146 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
147 LP.Personality = Personality;
149 for (unsigned i = 0; i < Personalities.size(); ++i)
150 if (Personalities[i] == Personality)
153 // If this is the first personality we're adding go
154 // ahead and add it at the beginning.
155 if (Personalities[0] == NULL)
156 Personalities[0] = Personality;
158 Personalities.push_back(Personality);
161 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
163 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
164 std::vector<GlobalVariable *> &TyInfo) {
165 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
166 for (unsigned N = TyInfo.size(); N; --N)
167 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
170 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
172 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
173 std::vector<GlobalVariable *> &TyInfo) {
174 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
175 std::vector<unsigned> IdsInFilter(TyInfo.size());
176 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
177 IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
178 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
181 /// addCleanup - Add a cleanup action for a landing pad.
183 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
184 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
185 LP.TypeIds.push_back(0);
188 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
190 void MachineModuleInfo::TidyLandingPads() {
191 for (unsigned i = 0; i != LandingPads.size(); ) {
192 LandingPadInfo &LandingPad = LandingPads[i];
193 if (LandingPad.LandingPadLabel && !LandingPad.LandingPadLabel->isDefined())
194 LandingPad.LandingPadLabel = 0;
196 // Special case: we *should* emit LPs with null LP MBB. This indicates
198 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
199 LandingPads.erase(LandingPads.begin() + i);
203 for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
204 MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
205 MCSymbol *EndLabel = LandingPad.EndLabels[j];
206 if (BeginLabel->isDefined() && EndLabel->isDefined()) continue;
208 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
209 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
213 // Remove landing pads with no try-ranges.
214 if (LandingPads[i].BeginLabels.empty()) {
215 LandingPads.erase(LandingPads.begin() + i);
219 // If there is no landing pad, ensure that the list of typeids is empty.
220 // If the only typeid is a cleanup, this is the same as having no typeids.
221 if (!LandingPad.LandingPadBlock ||
222 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
223 LandingPad.TypeIds.clear();
228 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
230 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
231 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
232 if (TypeInfos[i] == TI) return i + 1;
234 TypeInfos.push_back(TI);
235 return TypeInfos.size();
238 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is
240 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
241 // If the new filter coincides with the tail of an existing filter, then
242 // re-use the existing filter. Folding filters more than this requires
243 // re-ordering filters and/or their elements - probably not worth it.
244 for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
245 E = FilterEnds.end(); I != E; ++I) {
246 unsigned i = *I, j = TyIds.size();
249 if (FilterIds[--i] != TyIds[--j])
253 // The new filter coincides with range [i, end) of the existing filter.
259 // Add the new filter.
260 int FilterID = -(1 + FilterIds.size());
261 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
262 for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
263 FilterIds.push_back(TyIds[I]);
264 FilterEnds.push_back(FilterIds.size());
265 FilterIds.push_back(0); // terminator
269 /// getPersonality - Return the personality function for the current function.
270 Function *MachineModuleInfo::getPersonality() const {
271 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per
273 return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
276 /// getPersonalityIndex - Return unique index for current personality
277 /// function. NULL/first personality function should always get zero index.
278 unsigned MachineModuleInfo::getPersonalityIndex() const {
279 const Function* Personality = NULL;
281 // Scan landing pads. If there is at least one non-NULL personality - use it.
282 for (unsigned i = 0; i != LandingPads.size(); ++i)
283 if (LandingPads[i].Personality) {
284 Personality = LandingPads[i].Personality;
288 for (unsigned i = 0; i < Personalities.size(); ++i) {
289 if (Personalities[i] == Personality)
293 // This will happen if the current personality function is
294 // in the zero index.