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/MCAsmInfo.h"
26 #include "llvm/MC/MCSymbol.h"
27 #include "llvm/Support/Dwarf.h"
28 #include "llvm/Support/ErrorHandling.h"
30 using namespace llvm::dwarf;
32 // Handle the Pass registration stuff necessary to use TargetData's.
33 static RegisterPass<MachineModuleInfo>
34 X("machinemoduleinfo", "Machine Module Information");
35 char MachineModuleInfo::ID = 0;
37 // Out of line virtual method.
38 MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
40 //===----------------------------------------------------------------------===//
42 MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI)
43 : ImmutablePass(&ID), Context(MAI),
44 ObjFileMMI(0), CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0),
45 DbgInfoAvailable(false) {
46 // Always emit some info, by default "no personality" info.
47 Personalities.push_back(NULL);
50 MachineModuleInfo::MachineModuleInfo()
51 : ImmutablePass(&ID), Context(*(MCAsmInfo*)0) {
52 assert(0 && "This MachineModuleInfo constructor should never be called, MMI "
53 "should always be explicitly constructed by LLVMTargetMachine");
57 MachineModuleInfo::~MachineModuleInfo() {
61 /// doInitialization - Initialize the state for a new module.
63 bool MachineModuleInfo::doInitialization() {
67 /// doFinalization - Tear down the state after completion of a module.
69 bool MachineModuleInfo::doFinalization() {
73 /// getLabelSym - Turn a label ID into a symbol.
74 MCSymbol *MachineModuleInfo::getLabelSym(unsigned ID) {
75 return Context.GetOrCreateTemporarySymbol
76 (Twine(Context.getAsmInfo().getPrivateGlobalPrefix()) + "Label" +Twine(ID));
79 /// EndFunction - Discard function meta information.
81 void MachineModuleInfo::EndFunction() {
82 // Clean up frame info.
85 // Clean up exception info.
93 VariableDbgInfo.clear();
96 /// AnalyzeModule - Scan the module for global debug information.
98 void MachineModuleInfo::AnalyzeModule(Module &M) {
99 // Insert functions in the llvm.used array (but not llvm.compiler.used) into
101 GlobalVariable *GV = M.getGlobalVariable("llvm.used");
102 if (!GV || !GV->hasInitializer()) return;
104 // Should be an array of 'i8*'.
105 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
106 if (InitList == 0) return;
108 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
110 dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts()))
111 UsedFunctions.insert(F);
114 //===-EH-------------------------------------------------------------------===//
116 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
117 /// specified MachineBasicBlock.
118 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
119 (MachineBasicBlock *LandingPad) {
120 unsigned N = LandingPads.size();
121 for (unsigned i = 0; i < N; ++i) {
122 LandingPadInfo &LP = LandingPads[i];
123 if (LP.LandingPadBlock == LandingPad)
127 LandingPads.push_back(LandingPadInfo(LandingPad));
128 return LandingPads[N];
131 /// addInvoke - Provide the begin and end labels of an invoke style call and
132 /// associate it with a try landing pad block.
133 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
134 MCSymbol *BeginLabel, MCSymbol *EndLabel) {
135 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
136 LP.BeginLabels.push_back(BeginLabel);
137 LP.EndLabels.push_back(EndLabel);
140 /// addLandingPad - Provide the label of a try LandingPad block.
142 unsigned MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
143 unsigned LandingPadID = NextLabelID();
144 MCSymbol *LandingPadLabel = getLabelSym(LandingPadID);
145 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
146 LP.LandingPadLabel = LandingPadLabel;
150 /// addPersonality - Provide the personality function for the exception
152 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
153 Function *Personality) {
154 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
155 LP.Personality = Personality;
157 for (unsigned i = 0; i < Personalities.size(); ++i)
158 if (Personalities[i] == Personality)
161 // If this is the first personality we're adding go
162 // ahead and add it at the beginning.
163 if (Personalities[0] == NULL)
164 Personalities[0] = Personality;
166 Personalities.push_back(Personality);
169 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
171 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
172 std::vector<GlobalVariable *> &TyInfo) {
173 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
174 for (unsigned N = TyInfo.size(); N; --N)
175 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
178 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
180 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
181 std::vector<GlobalVariable *> &TyInfo) {
182 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
183 std::vector<unsigned> IdsInFilter(TyInfo.size());
184 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
185 IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
186 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
189 /// addCleanup - Add a cleanup action for a landing pad.
191 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
192 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
193 LP.TypeIds.push_back(0);
196 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
198 void MachineModuleInfo::TidyLandingPads() {
199 for (unsigned i = 0; i != LandingPads.size(); ) {
200 LandingPadInfo &LandingPad = LandingPads[i];
201 if (LandingPad.LandingPadLabel && !LandingPad.LandingPadLabel->isDefined())
202 LandingPad.LandingPadLabel = 0;
204 // Special case: we *should* emit LPs with null LP MBB. This indicates
206 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
207 LandingPads.erase(LandingPads.begin() + i);
211 for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
212 MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
213 MCSymbol *EndLabel = LandingPad.EndLabels[j];
214 if (BeginLabel->isDefined() && EndLabel->isDefined()) continue;
216 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
217 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
221 // Remove landing pads with no try-ranges.
222 if (LandingPads[i].BeginLabels.empty()) {
223 LandingPads.erase(LandingPads.begin() + i);
227 // If there is no landing pad, ensure that the list of typeids is empty.
228 // If the only typeid is a cleanup, this is the same as having no typeids.
229 if (!LandingPad.LandingPadBlock ||
230 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
231 LandingPad.TypeIds.clear();
236 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
238 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
239 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
240 if (TypeInfos[i] == TI) return i + 1;
242 TypeInfos.push_back(TI);
243 return TypeInfos.size();
246 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is
248 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
249 // If the new filter coincides with the tail of an existing filter, then
250 // re-use the existing filter. Folding filters more than this requires
251 // re-ordering filters and/or their elements - probably not worth it.
252 for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
253 E = FilterEnds.end(); I != E; ++I) {
254 unsigned i = *I, j = TyIds.size();
257 if (FilterIds[--i] != TyIds[--j])
261 // The new filter coincides with range [i, end) of the existing filter.
267 // Add the new filter.
268 int FilterID = -(1 + FilterIds.size());
269 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
270 for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
271 FilterIds.push_back(TyIds[I]);
272 FilterEnds.push_back(FilterIds.size());
273 FilterIds.push_back(0); // terminator
277 /// getPersonality - Return the personality function for the current function.
278 Function *MachineModuleInfo::getPersonality() const {
279 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per
281 return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
284 /// getPersonalityIndex - Return unique index for current personality
285 /// function. NULL/first personality function should always get zero index.
286 unsigned MachineModuleInfo::getPersonalityIndex() const {
287 const Function* Personality = NULL;
289 // Scan landing pads. If there is at least one non-NULL personality - use it.
290 for (unsigned i = 0; i != LandingPads.size(); ++i)
291 if (LandingPads[i].Personality) {
292 Personality = LandingPads[i].Personality;
296 for (unsigned i = 0; i < Personalities.size(); ++i) {
297 if (Personalities[i] == Personality)
301 // This will happen if the current personality function is
302 // in the zero index.