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), NextLabelIDToReturn(1),
45 CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0), 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 MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
143 MCSymbol *LandingPadLabel = getLabelSym(NextLabelID());
144 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
145 LP.LandingPadLabel = LandingPadLabel;
146 return LandingPadLabel;
149 /// addPersonality - Provide the personality function for the exception
151 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
152 Function *Personality) {
153 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
154 LP.Personality = Personality;
156 for (unsigned i = 0; i < Personalities.size(); ++i)
157 if (Personalities[i] == Personality)
160 // If this is the first personality we're adding go
161 // ahead and add it at the beginning.
162 if (Personalities[0] == NULL)
163 Personalities[0] = Personality;
165 Personalities.push_back(Personality);
168 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
170 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad,
171 std::vector<GlobalVariable *> &TyInfo) {
172 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
173 for (unsigned N = TyInfo.size(); N; --N)
174 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
177 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
179 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad,
180 std::vector<GlobalVariable *> &TyInfo) {
181 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
182 std::vector<unsigned> IdsInFilter(TyInfo.size());
183 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
184 IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
185 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
188 /// addCleanup - Add a cleanup action for a landing pad.
190 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
191 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
192 LP.TypeIds.push_back(0);
195 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
197 void MachineModuleInfo::TidyLandingPads() {
198 for (unsigned i = 0; i != LandingPads.size(); ) {
199 LandingPadInfo &LandingPad = LandingPads[i];
200 if (LandingPad.LandingPadLabel && !LandingPad.LandingPadLabel->isDefined())
201 LandingPad.LandingPadLabel = 0;
203 // Special case: we *should* emit LPs with null LP MBB. This indicates
205 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
206 LandingPads.erase(LandingPads.begin() + i);
210 for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
211 MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
212 MCSymbol *EndLabel = LandingPad.EndLabels[j];
213 if (BeginLabel->isDefined() && EndLabel->isDefined()) continue;
215 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
216 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
220 // Remove landing pads with no try-ranges.
221 if (LandingPads[i].BeginLabels.empty()) {
222 LandingPads.erase(LandingPads.begin() + i);
226 // If there is no landing pad, ensure that the list of typeids is empty.
227 // If the only typeid is a cleanup, this is the same as having no typeids.
228 if (!LandingPad.LandingPadBlock ||
229 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
230 LandingPad.TypeIds.clear();
235 /// getTypeIDFor - Return the type id for the specified typeinfo. This is
237 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) {
238 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i)
239 if (TypeInfos[i] == TI) return i + 1;
241 TypeInfos.push_back(TI);
242 return TypeInfos.size();
245 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is
247 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) {
248 // If the new filter coincides with the tail of an existing filter, then
249 // re-use the existing filter. Folding filters more than this requires
250 // re-ordering filters and/or their elements - probably not worth it.
251 for (std::vector<unsigned>::iterator I = FilterEnds.begin(),
252 E = FilterEnds.end(); I != E; ++I) {
253 unsigned i = *I, j = TyIds.size();
256 if (FilterIds[--i] != TyIds[--j])
260 // The new filter coincides with range [i, end) of the existing filter.
266 // Add the new filter.
267 int FilterID = -(1 + FilterIds.size());
268 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
269 for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
270 FilterIds.push_back(TyIds[I]);
271 FilterEnds.push_back(FilterIds.size());
272 FilterIds.push_back(0); // terminator
276 /// getPersonality - Return the personality function for the current function.
277 Function *MachineModuleInfo::getPersonality() const {
278 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per
280 return !LandingPads.empty() ? LandingPads[0].Personality : NULL;
283 /// getPersonalityIndex - Return unique index for current personality
284 /// function. NULL/first personality function should always get zero index.
285 unsigned MachineModuleInfo::getPersonalityIndex() const {
286 const Function* Personality = NULL;
288 // Scan landing pads. If there is at least one non-NULL personality - use it.
289 for (unsigned i = 0; i != LandingPads.size(); ++i)
290 if (LandingPads[i].Personality) {
291 Personality = LandingPads[i].Personality;
295 for (unsigned i = 0; i < Personalities.size(); ++i) {
296 if (Personalities[i] == Personality)
300 // This will happen if the current personality function is
301 // in the zero index.