1 //===----- JITDwarfEmitter.cpp - Write dwarf tables into memory -----------===//
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 defines a JITDwarfEmitter object that is used by the JIT to
11 // write dwarf tables to memory.
13 //===----------------------------------------------------------------------===//
16 #include "JITDwarfEmitter.h"
17 #include "llvm/Function.h"
18 #include "llvm/ADT/DenseMap.h"
19 #include "llvm/CodeGen/MachineCodeEmitter.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineLocation.h"
22 #include "llvm/CodeGen/MachineModuleInfo.h"
23 #include "llvm/ExecutionEngine/JITMemoryManager.h"
24 #include "llvm/Target/TargetAsmInfo.h"
25 #include "llvm/Target/TargetData.h"
26 #include "llvm/Target/TargetInstrInfo.h"
27 #include "llvm/Target/TargetFrameInfo.h"
28 #include "llvm/Target/TargetMachine.h"
29 #include "llvm/Target/TargetRegisterInfo.h"
33 JITDwarfEmitter::JITDwarfEmitter(JIT& theJit) : Jit(theJit) {}
36 unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F,
37 MachineCodeEmitter& mce,
38 unsigned char* StartFunction,
39 unsigned char* EndFunction) {
40 const TargetMachine& TM = F.getTarget();
41 TD = TM.getTargetData();
42 needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
43 stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
44 RI = TM.getRegisterInfo();
47 unsigned char* ExceptionTable = EmitExceptionTable(&F, StartFunction,
50 unsigned char* Result = 0;
51 unsigned char* EHFramePtr = 0;
53 const std::vector<Function *> Personalities = MMI->getPersonalities();
54 EHFramePtr = EmitCommonEHFrame(Personalities[MMI->getPersonalityIndex()]);
56 Result = EmitEHFrame(Personalities[MMI->getPersonalityIndex()], EHFramePtr,
57 StartFunction, EndFunction, ExceptionTable);
64 JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr,
65 const std::vector<MachineMove> &Moves) const {
66 unsigned PointerSize = TD->getPointerSize();
67 int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
68 PointerSize : -PointerSize;
70 unsigned BaseLabelID = 0;
72 for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
73 const MachineMove &Move = Moves[i];
74 unsigned LabelID = Move.getLabelID();
77 LabelID = MMI->MappedLabel(LabelID);
79 // Throw out move if the label is invalid.
80 if (!LabelID) continue;
83 intptr_t LabelPtr = 0;
84 if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
86 const MachineLocation &Dst = Move.getDestination();
87 const MachineLocation &Src = Move.getSource();
89 // Advance row if new location.
90 if (BaseLabelPtr && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
91 MCE->emitByte(dwarf::DW_CFA_advance_loc4);
92 MCE->emitInt32(LabelPtr - BaseLabelPtr);
94 BaseLabelID = LabelID;
95 BaseLabelPtr = LabelPtr;
100 if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
102 if (Src.getReg() == MachineLocation::VirtualFP) {
103 MCE->emitByte(dwarf::DW_CFA_def_cfa_offset);
105 MCE->emitByte(dwarf::DW_CFA_def_cfa);
106 MCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), true));
109 int Offset = -Src.getOffset();
111 MCE->emitULEB128Bytes(Offset);
113 assert(0 && "Machine move no supported yet.");
115 } else if (Src.isReg() &&
116 Src.getReg() == MachineLocation::VirtualFP) {
118 MCE->emitByte(dwarf::DW_CFA_def_cfa_register);
119 MCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), true));
121 assert(0 && "Machine move no supported yet.");
124 unsigned Reg = RI->getDwarfRegNum(Src.getReg(), true);
125 int Offset = Dst.getOffset() / stackGrowth;
128 MCE->emitByte(dwarf::DW_CFA_offset_extended_sf);
129 MCE->emitULEB128Bytes(Reg);
130 MCE->emitSLEB128Bytes(Offset);
131 } else if (Reg < 64) {
132 MCE->emitByte(dwarf::DW_CFA_offset + Reg);
133 MCE->emitULEB128Bytes(Offset);
135 MCE->emitByte(dwarf::DW_CFA_offset_extended);
136 MCE->emitULEB128Bytes(Reg);
137 MCE->emitULEB128Bytes(Offset);
143 /// SharedTypeIds - How many leading type ids two landing pads have in common.
144 static unsigned SharedTypeIds(const LandingPadInfo *L,
145 const LandingPadInfo *R) {
146 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
147 unsigned LSize = LIds.size(), RSize = RIds.size();
148 unsigned MinSize = LSize < RSize ? LSize : RSize;
151 for (; Count != MinSize; ++Count)
152 if (LIds[Count] != RIds[Count])
159 /// PadLT - Order landing pads lexicographically by type id.
160 static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
161 const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
162 unsigned LSize = LIds.size(), RSize = RIds.size();
163 unsigned MinSize = LSize < RSize ? LSize : RSize;
165 for (unsigned i = 0; i != MinSize; ++i)
166 if (LIds[i] != RIds[i])
167 return LIds[i] < RIds[i];
169 return LSize < RSize;
175 static inline unsigned getEmptyKey() { return -1U; }
176 static inline unsigned getTombstoneKey() { return -2U; }
177 static unsigned getHashValue(const unsigned &Key) { return Key; }
178 static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
179 static bool isPod() { return true; }
182 /// ActionEntry - Structure describing an entry in the actions table.
184 int ValueForTypeID; // The value to write - may not be equal to the type id.
186 struct ActionEntry *Previous;
189 /// PadRange - Structure holding a try-range and the associated landing pad.
191 // The index of the landing pad.
193 // The index of the begin and end labels in the landing pad's label lists.
197 typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
199 /// CallSiteEntry - Structure describing an entry in the call-site table.
200 struct CallSiteEntry {
201 unsigned BeginLabel; // zero indicates the start of the function.
202 unsigned EndLabel; // zero indicates the end of the function.
203 unsigned PadLabel; // zero indicates that there is no landing pad.
209 unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
210 unsigned char* StartFunction,
211 unsigned char* EndFunction) const {
212 // Map all labels and get rid of any dead landing pads.
213 MMI->TidyLandingPads();
215 const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
216 const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
217 const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
218 if (PadInfos.empty()) return 0;
220 // Sort the landing pads in order of their type ids. This is used to fold
221 // duplicate actions.
222 SmallVector<const LandingPadInfo *, 64> LandingPads;
223 LandingPads.reserve(PadInfos.size());
224 for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
225 LandingPads.push_back(&PadInfos[i]);
226 std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
228 // Negative type ids index into FilterIds, positive type ids index into
229 // TypeInfos. The value written for a positive type id is just the type
230 // id itself. For a negative type id, however, the value written is the
231 // (negative) byte offset of the corresponding FilterIds entry. The byte
232 // offset is usually equal to the type id, because the FilterIds entries
233 // are written using a variable width encoding which outputs one byte per
234 // entry as long as the value written is not too large, but can differ.
235 // This kind of complication does not occur for positive type ids because
236 // type infos are output using a fixed width encoding.
237 // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
238 SmallVector<int, 16> FilterOffsets;
239 FilterOffsets.reserve(FilterIds.size());
241 for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
242 E = FilterIds.end(); I != E; ++I) {
243 FilterOffsets.push_back(Offset);
244 Offset -= TargetAsmInfo::getULEB128Size(*I);
247 // Compute the actions table and gather the first action index for each
249 SmallVector<ActionEntry, 32> Actions;
250 SmallVector<unsigned, 64> FirstActions;
251 FirstActions.reserve(LandingPads.size());
254 unsigned SizeActions = 0;
255 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
256 const LandingPadInfo *LP = LandingPads[i];
257 const std::vector<int> &TypeIds = LP->TypeIds;
258 const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
259 unsigned SizeSiteActions = 0;
261 if (NumShared < TypeIds.size()) {
262 unsigned SizeAction = 0;
263 ActionEntry *PrevAction = 0;
266 const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
267 assert(Actions.size());
268 PrevAction = &Actions.back();
269 SizeAction = TargetAsmInfo::getSLEB128Size(PrevAction->NextAction) +
270 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
271 for (unsigned j = NumShared; j != SizePrevIds; ++j) {
272 SizeAction -= TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
273 SizeAction += -PrevAction->NextAction;
274 PrevAction = PrevAction->Previous;
278 // Compute the actions.
279 for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
280 int TypeID = TypeIds[I];
281 assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
282 int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
283 unsigned SizeTypeID = TargetAsmInfo::getSLEB128Size(ValueForTypeID);
285 int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
286 SizeAction = SizeTypeID + TargetAsmInfo::getSLEB128Size(NextAction);
287 SizeSiteActions += SizeAction;
289 ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
290 Actions.push_back(Action);
292 PrevAction = &Actions.back();
295 // Record the first action of the landing pad site.
296 FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
297 } // else identical - re-use previous FirstAction
299 FirstActions.push_back(FirstAction);
301 // Compute this sites contribution to size.
302 SizeActions += SizeSiteActions;
305 // Compute the call-site table. Entries must be ordered by address.
306 SmallVector<CallSiteEntry, 64> CallSites;
309 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
310 const LandingPadInfo *LandingPad = LandingPads[i];
311 for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
312 unsigned BeginLabel = LandingPad->BeginLabels[j];
313 assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
314 PadRange P = { i, j };
315 PadMap[BeginLabel] = P;
319 bool MayThrow = false;
320 unsigned LastLabel = 0;
321 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
323 for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
325 if (!MI->isLabel()) {
326 MayThrow |= MI->getDesc().isCall();
330 unsigned BeginLabel = MI->getOperand(0).getImm();
331 assert(BeginLabel && "Invalid label!");
333 if (BeginLabel == LastLabel)
336 RangeMapType::iterator L = PadMap.find(BeginLabel);
338 if (L == PadMap.end())
341 PadRange P = L->second;
342 const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
344 assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
345 "Inconsistent landing pad map!");
347 // If some instruction between the previous try-range and this one may
348 // throw, create a call-site entry with no landing pad for the region
349 // between the try-ranges.
351 CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
352 CallSites.push_back(Site);
355 LastLabel = LandingPad->EndLabels[P.RangeIndex];
356 CallSiteEntry Site = {BeginLabel, LastLabel,
357 LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
359 assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
360 "Invalid landing pad!");
362 // Try to merge with the previous call-site.
363 if (CallSites.size()) {
364 CallSiteEntry &Prev = CallSites.back();
365 if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
366 // Extend the range of the previous entry.
367 Prev.EndLabel = Site.EndLabel;
372 // Otherwise, create a new call-site.
373 CallSites.push_back(Site);
376 // If some instruction between the previous try-range and the end of the
377 // function may throw, create a call-site entry with no landing pad for the
378 // region following the try-range.
380 CallSiteEntry Site = {LastLabel, 0, 0, 0};
381 CallSites.push_back(Site);
385 unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
386 sizeof(int32_t) + // Site length.
387 sizeof(int32_t)); // Landing pad.
388 for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
389 SizeSites += TargetAsmInfo::getULEB128Size(CallSites[i].Action);
391 unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
393 unsigned TypeOffset = sizeof(int8_t) + // Call site format
394 // Call-site table length
395 TargetAsmInfo::getULEB128Size(SizeSites) +
396 SizeSites + SizeActions + SizeTypes;
398 unsigned TotalSize = sizeof(int8_t) + // LPStart format
399 sizeof(int8_t) + // TType format
400 TargetAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
403 unsigned SizeAlign = (4 - TotalSize) & 3;
405 // Begin the exception table.
406 MCE->emitAlignment(4);
407 for (unsigned i = 0; i != SizeAlign; ++i) {
409 // Asm->EOL("Padding");
412 unsigned char* DwarfExceptionTable = (unsigned char*)MCE->getCurrentPCValue();
415 MCE->emitByte(dwarf::DW_EH_PE_omit);
416 // Asm->EOL("LPStart format (DW_EH_PE_omit)");
417 MCE->emitByte(dwarf::DW_EH_PE_absptr);
418 // Asm->EOL("TType format (DW_EH_PE_absptr)");
419 MCE->emitULEB128Bytes(TypeOffset);
420 // Asm->EOL("TType base offset");
421 MCE->emitByte(dwarf::DW_EH_PE_udata4);
422 // Asm->EOL("Call site format (DW_EH_PE_udata4)");
423 MCE->emitULEB128Bytes(SizeSites);
424 // Asm->EOL("Call-site table length");
426 // Emit the landing pad site information.
427 for (unsigned i = 0; i < CallSites.size(); ++i) {
428 CallSiteEntry &S = CallSites[i];
429 intptr_t BeginLabelPtr = 0;
430 intptr_t EndLabelPtr = 0;
433 BeginLabelPtr = (intptr_t)StartFunction;
436 BeginLabelPtr = MCE->getLabelAddress(S.BeginLabel);
437 MCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction);
440 // Asm->EOL("Region start");
443 EndLabelPtr = (intptr_t)EndFunction;
444 MCE->emitInt32((intptr_t)EndFunction - BeginLabelPtr);
446 EndLabelPtr = MCE->getLabelAddress(S.EndLabel);
447 MCE->emitInt32(EndLabelPtr - BeginLabelPtr);
449 //Asm->EOL("Region length");
454 unsigned PadLabelPtr = MCE->getLabelAddress(S.PadLabel);
455 MCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction);
457 // Asm->EOL("Landing pad");
459 MCE->emitULEB128Bytes(S.Action);
460 // Asm->EOL("Action");
464 for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
465 ActionEntry &Action = Actions[I];
467 MCE->emitSLEB128Bytes(Action.ValueForTypeID);
468 //Asm->EOL("TypeInfo index");
469 MCE->emitSLEB128Bytes(Action.NextAction);
470 //Asm->EOL("Next action");
473 // Emit the type ids.
474 for (unsigned M = TypeInfos.size(); M; --M) {
475 GlobalVariable *GV = TypeInfos[M - 1];
478 if (TD->getPointerSize() == sizeof(int32_t)) {
479 MCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV));
481 MCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV));
484 if (TD->getPointerSize() == sizeof(int32_t))
489 // Asm->EOL("TypeInfo");
492 // Emit the filter typeids.
493 for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
494 unsigned TypeID = FilterIds[j];
495 MCE->emitULEB128Bytes(TypeID);
496 //Asm->EOL("Filter TypeInfo index");
499 MCE->emitAlignment(4);
501 return DwarfExceptionTable;
505 JITDwarfEmitter::EmitCommonEHFrame(const Function* Personality) const {
506 unsigned PointerSize = TD->getPointerSize();
507 int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
508 PointerSize : -PointerSize;
510 unsigned char* StartCommonPtr = (unsigned char*)MCE->getCurrentPCValue();
511 // EH Common Frame header
512 MCE->allocateSpace(4, 0);
513 unsigned char* FrameCommonBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
514 MCE->emitInt32((int)0);
515 MCE->emitByte(dwarf::DW_CIE_VERSION);
516 MCE->emitString(Personality ? "zPLR" : "zR");
517 MCE->emitULEB128Bytes(1);
518 MCE->emitSLEB128Bytes(stackGrowth);
519 MCE->emitByte(RI->getDwarfRegNum(RI->getRARegister(), true));
522 MCE->emitULEB128Bytes(7);
524 // Direct encoding, because we use the function pointer. Not relative,
525 // because the current PC value may be bigger than the personality
527 MCE->emitByte(dwarf::DW_EH_PE_sdata4);
529 MCE->emitInt32(((intptr_t)Jit.getPointerToGlobal(Personality)));
531 MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
532 MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
535 MCE->emitULEB128Bytes(1);
536 MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
539 std::vector<MachineMove> Moves;
540 RI->getInitialFrameState(Moves);
541 EmitFrameMoves(0, Moves);
542 MCE->emitAlignment(PointerSize);
544 MCE->emitInt32At((uintptr_t*)StartCommonPtr,
545 (uintptr_t)((unsigned char*)MCE->getCurrentPCValue() -
546 FrameCommonBeginPtr));
548 return StartCommonPtr;
553 JITDwarfEmitter::EmitEHFrame(const Function* Personality,
554 unsigned char* StartCommonPtr,
555 unsigned char* StartFunction,
556 unsigned char* EndFunction,
557 unsigned char* ExceptionTable) const {
558 unsigned PointerSize = TD->getPointerSize();
561 unsigned char* StartEHPtr = (unsigned char*)MCE->getCurrentPCValue();
562 MCE->allocateSpace(4, 0);
563 unsigned char* FrameBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
565 MCE->emitInt32(FrameBeginPtr - StartCommonPtr);
566 MCE->emitInt32(StartFunction - (unsigned char*)MCE->getCurrentPCValue());
567 MCE->emitInt32(EndFunction - StartFunction);
569 // If there is a personality and landing pads then point to the language
570 // specific data area in the exception table.
571 if (MMI->getPersonalityIndex()) {
572 MCE->emitULEB128Bytes(4);
574 if (!MMI->getLandingPads().empty()) {
575 MCE->emitInt32(ExceptionTable - (unsigned char*)MCE->getCurrentPCValue());
577 MCE->emitInt32((int)0);
580 MCE->emitULEB128Bytes(0);
583 // Indicate locations of function specific callee saved registers in
585 EmitFrameMoves((intptr_t)StartFunction, MMI->getFrameMoves());
587 MCE->emitAlignment(PointerSize);
589 // Indicate the size of the table
590 MCE->emitInt32At((uintptr_t*)StartEHPtr,
591 (uintptr_t)((unsigned char*)MCE->getCurrentPCValue() -
594 // Double zeroes for the unwind runtime
595 if (PointerSize == 8) {
607 unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
608 MachineCodeEmitter& mce,
609 unsigned char* StartFunction,
610 unsigned char* EndFunction) {
611 const TargetMachine& TM = F.getTarget();
612 TD = TM.getTargetData();
613 needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
614 stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
615 RI = TM.getRegisterInfo();
617 unsigned FinalSize = 0;
619 FinalSize += GetExceptionTableSizeInBytes(&F);
621 const std::vector<Function *> Personalities = MMI->getPersonalities();
623 GetCommonEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()]);
625 FinalSize += GetEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()],
631 /// RoundUpToAlign - Add the specified alignment to FinalSize and returns
633 static unsigned RoundUpToAlign(unsigned FinalSize, unsigned Alignment) {
634 if (Alignment == 0) Alignment = 1;
635 // Since we do not know where the buffer will be allocated, be pessimistic.
636 return FinalSize + Alignment;
640 JITDwarfEmitter::GetEHFrameSizeInBytes(const Function* Personality,
641 unsigned char* StartFunction) const {
642 unsigned PointerSize = TD->getPointerSize();
643 unsigned FinalSize = 0;
645 FinalSize += PointerSize;
647 FinalSize += 3 * PointerSize;
648 // If there is a personality and landing pads then point to the language
649 // specific data area in the exception table.
650 if (MMI->getPersonalityIndex()) {
651 FinalSize += TargetAsmInfo::getULEB128Size(4);
652 FinalSize += PointerSize;
654 FinalSize += TargetAsmInfo::getULEB128Size(0);
657 // Indicate locations of function specific callee saved registers in
659 FinalSize += GetFrameMovesSizeInBytes((intptr_t)StartFunction,
660 MMI->getFrameMoves());
662 FinalSize = RoundUpToAlign(FinalSize, 4);
664 // Double zeroes for the unwind runtime
665 FinalSize += 2 * PointerSize;
670 unsigned JITDwarfEmitter::GetCommonEHFrameSizeInBytes(const Function* Personality)
673 unsigned PointerSize = TD->getPointerSize();
674 int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
675 PointerSize : -PointerSize;
676 unsigned FinalSize = 0;
677 // EH Common Frame header
678 FinalSize += PointerSize;
681 FinalSize += Personality ? 5 : 3; // "zPLR" or "zR"
682 FinalSize += TargetAsmInfo::getULEB128Size(1);
683 FinalSize += TargetAsmInfo::getSLEB128Size(stackGrowth);
687 FinalSize += TargetAsmInfo::getULEB128Size(7);
692 FinalSize += PointerSize;
694 FinalSize += TargetAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
695 FinalSize += TargetAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
698 FinalSize += TargetAsmInfo::getULEB128Size(1);
699 FinalSize += TargetAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
702 std::vector<MachineMove> Moves;
703 RI->getInitialFrameState(Moves);
704 FinalSize += GetFrameMovesSizeInBytes(0, Moves);
705 FinalSize = RoundUpToAlign(FinalSize, 4);
710 JITDwarfEmitter::GetFrameMovesSizeInBytes(intptr_t BaseLabelPtr,
711 const std::vector<MachineMove> &Moves) const {
712 unsigned PointerSize = TD->getPointerSize();
713 int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
714 PointerSize : -PointerSize;
715 bool IsLocal = BaseLabelPtr;
716 unsigned FinalSize = 0;
718 for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
719 const MachineMove &Move = Moves[i];
720 unsigned LabelID = Move.getLabelID();
723 LabelID = MMI->MappedLabel(LabelID);
725 // Throw out move if the label is invalid.
726 if (!LabelID) continue;
729 intptr_t LabelPtr = 0;
730 if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
732 const MachineLocation &Dst = Move.getDestination();
733 const MachineLocation &Src = Move.getSource();
735 // Advance row if new location.
736 if (BaseLabelPtr && LabelID && (BaseLabelPtr != LabelPtr || !IsLocal)) {
738 FinalSize += PointerSize;
739 BaseLabelPtr = LabelPtr;
744 if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
746 if (Src.getReg() == MachineLocation::VirtualFP) {
750 unsigned RegNum = RI->getDwarfRegNum(Src.getReg(), true);
751 FinalSize += TargetAsmInfo::getULEB128Size(RegNum);
754 int Offset = -Src.getOffset();
756 FinalSize += TargetAsmInfo::getULEB128Size(Offset);
758 assert(0 && "Machine move no supported yet.");
760 } else if (Src.isReg() &&
761 Src.getReg() == MachineLocation::VirtualFP) {
764 unsigned RegNum = RI->getDwarfRegNum(Dst.getReg(), true);
765 FinalSize += TargetAsmInfo::getULEB128Size(RegNum);
767 assert(0 && "Machine move no supported yet.");
770 unsigned Reg = RI->getDwarfRegNum(Src.getReg(), true);
771 int Offset = Dst.getOffset() / stackGrowth;
775 FinalSize += TargetAsmInfo::getULEB128Size(Reg);
776 FinalSize += TargetAsmInfo::getSLEB128Size(Offset);
777 } else if (Reg < 64) {
779 FinalSize += TargetAsmInfo::getULEB128Size(Offset);
782 FinalSize += TargetAsmInfo::getULEB128Size(Reg);
783 FinalSize += TargetAsmInfo::getULEB128Size(Offset);
791 JITDwarfEmitter::GetExceptionTableSizeInBytes(MachineFunction* MF) const {
792 unsigned FinalSize = 0;
794 // Map all labels and get rid of any dead landing pads.
795 MMI->TidyLandingPads();
797 const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
798 const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
799 const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
800 if (PadInfos.empty()) return 0;
802 // Sort the landing pads in order of their type ids. This is used to fold
803 // duplicate actions.
804 SmallVector<const LandingPadInfo *, 64> LandingPads;
805 LandingPads.reserve(PadInfos.size());
806 for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
807 LandingPads.push_back(&PadInfos[i]);
808 std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
810 // Negative type ids index into FilterIds, positive type ids index into
811 // TypeInfos. The value written for a positive type id is just the type
812 // id itself. For a negative type id, however, the value written is the
813 // (negative) byte offset of the corresponding FilterIds entry. The byte
814 // offset is usually equal to the type id, because the FilterIds entries
815 // are written using a variable width encoding which outputs one byte per
816 // entry as long as the value written is not too large, but can differ.
817 // This kind of complication does not occur for positive type ids because
818 // type infos are output using a fixed width encoding.
819 // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
820 SmallVector<int, 16> FilterOffsets;
821 FilterOffsets.reserve(FilterIds.size());
823 for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
824 E = FilterIds.end(); I != E; ++I) {
825 FilterOffsets.push_back(Offset);
826 Offset -= TargetAsmInfo::getULEB128Size(*I);
829 // Compute the actions table and gather the first action index for each
831 SmallVector<ActionEntry, 32> Actions;
832 SmallVector<unsigned, 64> FirstActions;
833 FirstActions.reserve(LandingPads.size());
836 unsigned SizeActions = 0;
837 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
838 const LandingPadInfo *LP = LandingPads[i];
839 const std::vector<int> &TypeIds = LP->TypeIds;
840 const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
841 unsigned SizeSiteActions = 0;
843 if (NumShared < TypeIds.size()) {
844 unsigned SizeAction = 0;
845 ActionEntry *PrevAction = 0;
848 const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
849 assert(Actions.size());
850 PrevAction = &Actions.back();
851 SizeAction = TargetAsmInfo::getSLEB128Size(PrevAction->NextAction) +
852 TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
853 for (unsigned j = NumShared; j != SizePrevIds; ++j) {
854 SizeAction -= TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
855 SizeAction += -PrevAction->NextAction;
856 PrevAction = PrevAction->Previous;
860 // Compute the actions.
861 for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
862 int TypeID = TypeIds[I];
863 assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
864 int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
865 unsigned SizeTypeID = TargetAsmInfo::getSLEB128Size(ValueForTypeID);
867 int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
868 SizeAction = SizeTypeID + TargetAsmInfo::getSLEB128Size(NextAction);
869 SizeSiteActions += SizeAction;
871 ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
872 Actions.push_back(Action);
874 PrevAction = &Actions.back();
877 // Record the first action of the landing pad site.
878 FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
879 } // else identical - re-use previous FirstAction
881 FirstActions.push_back(FirstAction);
883 // Compute this sites contribution to size.
884 SizeActions += SizeSiteActions;
887 // Compute the call-site table. Entries must be ordered by address.
888 SmallVector<CallSiteEntry, 64> CallSites;
891 for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
892 const LandingPadInfo *LandingPad = LandingPads[i];
893 for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
894 unsigned BeginLabel = LandingPad->BeginLabels[j];
895 assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
896 PadRange P = { i, j };
897 PadMap[BeginLabel] = P;
901 bool MayThrow = false;
902 unsigned LastLabel = 0;
903 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
905 for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
907 if (!MI->isLabel()) {
908 MayThrow |= MI->getDesc().isCall();
912 unsigned BeginLabel = MI->getOperand(0).getImm();
913 assert(BeginLabel && "Invalid label!");
915 if (BeginLabel == LastLabel)
918 RangeMapType::iterator L = PadMap.find(BeginLabel);
920 if (L == PadMap.end())
923 PadRange P = L->second;
924 const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
926 assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
927 "Inconsistent landing pad map!");
929 // If some instruction between the previous try-range and this one may
930 // throw, create a call-site entry with no landing pad for the region
931 // between the try-ranges.
933 CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
934 CallSites.push_back(Site);
937 LastLabel = LandingPad->EndLabels[P.RangeIndex];
938 CallSiteEntry Site = {BeginLabel, LastLabel,
939 LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
941 assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
942 "Invalid landing pad!");
944 // Try to merge with the previous call-site.
945 if (CallSites.size()) {
946 CallSiteEntry &Prev = CallSites.back();
947 if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
948 // Extend the range of the previous entry.
949 Prev.EndLabel = Site.EndLabel;
954 // Otherwise, create a new call-site.
955 CallSites.push_back(Site);
958 // If some instruction between the previous try-range and the end of the
959 // function may throw, create a call-site entry with no landing pad for the
960 // region following the try-range.
962 CallSiteEntry Site = {LastLabel, 0, 0, 0};
963 CallSites.push_back(Site);
967 unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
968 sizeof(int32_t) + // Site length.
969 sizeof(int32_t)); // Landing pad.
970 for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
971 SizeSites += TargetAsmInfo::getULEB128Size(CallSites[i].Action);
973 unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
975 unsigned TypeOffset = sizeof(int8_t) + // Call site format
976 // Call-site table length
977 TargetAsmInfo::getULEB128Size(SizeSites) +
978 SizeSites + SizeActions + SizeTypes;
980 unsigned TotalSize = sizeof(int8_t) + // LPStart format
981 sizeof(int8_t) + // TType format
982 TargetAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
985 unsigned SizeAlign = (4 - TotalSize) & 3;
987 // Begin the exception table.
988 FinalSize = RoundUpToAlign(FinalSize, 4);
989 for (unsigned i = 0; i != SizeAlign; ++i) {
993 unsigned PointerSize = TD->getPointerSize();
997 // Asm->EOL("LPStart format (DW_EH_PE_omit)");
999 // Asm->EOL("TType format (DW_EH_PE_absptr)");
1001 // Asm->EOL("TType base offset");
1003 // Asm->EOL("Call site format (DW_EH_PE_udata4)");
1005 // Asm->EOL("Call-site table length");
1007 // Emit the landing pad site information.
1008 for (unsigned i = 0; i < CallSites.size(); ++i) {
1009 CallSiteEntry &S = CallSites[i];
1011 // Asm->EOL("Region start");
1012 FinalSize += PointerSize;
1014 //Asm->EOL("Region length");
1015 FinalSize += PointerSize;
1017 // Asm->EOL("Landing pad");
1018 FinalSize += PointerSize;
1020 FinalSize += TargetAsmInfo::getULEB128Size(S.Action);
1021 // Asm->EOL("Action");
1024 // Emit the actions.
1025 for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
1026 ActionEntry &Action = Actions[I];
1028 //Asm->EOL("TypeInfo index");
1029 FinalSize += TargetAsmInfo::getSLEB128Size(Action.ValueForTypeID);
1030 //Asm->EOL("Next action");
1031 FinalSize += TargetAsmInfo::getSLEB128Size(Action.NextAction);
1034 // Emit the type ids.
1035 for (unsigned M = TypeInfos.size(); M; --M) {
1036 // Asm->EOL("TypeInfo");
1037 FinalSize += PointerSize;
1040 // Emit the filter typeids.
1041 for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
1042 unsigned TypeID = FilterIds[j];
1043 FinalSize += TargetAsmInfo::getULEB128Size(TypeID);
1044 //Asm->EOL("Filter TypeInfo index");
1047 FinalSize = RoundUpToAlign(FinalSize, 4);