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//===----- JITDwarfEmitter.cpp - Write dwarf tables into memory -----------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file defines a JITDwarfEmitter object that is used by the JIT to
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// write dwarf tables to memory.
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//===----------------------------------------------------------------------===//
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#include "JITDwarfEmitter.h"
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#include "llvm/Function.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/CodeGen/JITCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineLocation.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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JITDwarfEmitter::JITDwarfEmitter(JIT& theJit) : MMI(0), Jit(theJit) {}
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unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F,
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unsigned char* StartFunction,
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unsigned char* EndFunction,
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unsigned char* &EHFramePtr) {
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assert(MMI && "MachineModuleInfo not registered!");
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const TargetMachine& TM = F.getTarget();
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TD = TM.getTargetData();
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stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
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RI = TM.getRegisterInfo();
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unsigned char* ExceptionTable = EmitExceptionTable(&F, StartFunction,
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unsigned char* Result = 0;
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const std::vector<Function *> Personalities = MMI->getPersonalities();
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EHFramePtr = EmitCommonEHFrame(Personalities[MMI->getPersonalityIndex()]);
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Result = EmitEHFrame(Personalities[MMI->getPersonalityIndex()], EHFramePtr,
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StartFunction, EndFunction, ExceptionTable);
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JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr,
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const std::vector<MachineMove> &Moves) const {
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unsigned PointerSize = TD->getPointerSize();
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int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
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PointerSize : -PointerSize;
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unsigned BaseLabelID = 0;
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for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
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const MachineMove &Move = Moves[i];
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unsigned LabelID = Move.getLabelID();
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LabelID = MMI->MappedLabel(LabelID);
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// Throw out move if the label is invalid.
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if (!LabelID) continue;
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intptr_t LabelPtr = 0;
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if (LabelID) LabelPtr = JCE->getLabelAddress(LabelID);
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const MachineLocation &Dst = Move.getDestination();
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const MachineLocation &Src = Move.getSource();
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// Advance row if new location.
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if (BaseLabelPtr && LabelID && (BaseLabelID != LabelID || !IsLocal)) {
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JCE->emitByte(dwarf::DW_CFA_advance_loc4);
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JCE->emitInt32(LabelPtr - BaseLabelPtr);
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BaseLabelID = LabelID;
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BaseLabelPtr = LabelPtr;
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if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
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if (Src.getReg() == MachineLocation::VirtualFP) {
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JCE->emitByte(dwarf::DW_CFA_def_cfa_offset);
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JCE->emitByte(dwarf::DW_CFA_def_cfa);
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JCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), true));
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JCE->emitULEB128Bytes(-Src.getOffset());
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llvm_unreachable("Machine move not supported yet.");
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} else if (Src.isReg() &&
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Src.getReg() == MachineLocation::VirtualFP) {
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JCE->emitByte(dwarf::DW_CFA_def_cfa_register);
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JCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), true));
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llvm_unreachable("Machine move not supported yet.");
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unsigned Reg = RI->getDwarfRegNum(Src.getReg(), true);
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int Offset = Dst.getOffset() / stackGrowth;
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JCE->emitByte(dwarf::DW_CFA_offset_extended_sf);
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JCE->emitULEB128Bytes(Reg);
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JCE->emitSLEB128Bytes(Offset);
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} else if (Reg < 64) {
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JCE->emitByte(dwarf::DW_CFA_offset + Reg);
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JCE->emitULEB128Bytes(Offset);
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JCE->emitByte(dwarf::DW_CFA_offset_extended);
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JCE->emitULEB128Bytes(Reg);
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JCE->emitULEB128Bytes(Offset);
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/// SharedTypeIds - How many leading type ids two landing pads have in common.
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static unsigned SharedTypeIds(const LandingPadInfo *L,
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const LandingPadInfo *R) {
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const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
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unsigned LSize = LIds.size(), RSize = RIds.size();
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unsigned MinSize = LSize < RSize ? LSize : RSize;
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for (; Count != MinSize; ++Count)
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if (LIds[Count] != RIds[Count])
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/// PadLT - Order landing pads lexicographically by type id.
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static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) {
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const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
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unsigned LSize = LIds.size(), RSize = RIds.size();
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unsigned MinSize = LSize < RSize ? LSize : RSize;
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for (unsigned i = 0; i != MinSize; ++i)
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if (LIds[i] != RIds[i])
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return LIds[i] < RIds[i];
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return LSize < RSize;
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static inline unsigned getEmptyKey() { return -1U; }
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static inline unsigned getTombstoneKey() { return -2U; }
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static unsigned getHashValue(const unsigned &Key) { return Key; }
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static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
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/// ActionEntry - Structure describing an entry in the actions table.
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int ValueForTypeID; // The value to write - may not be equal to the type id.
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struct ActionEntry *Previous;
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/// PadRange - Structure holding a try-range and the associated landing pad.
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// The index of the landing pad.
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// The index of the begin and end labels in the landing pad's label lists.
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typedef DenseMap<unsigned, PadRange, KeyInfo> RangeMapType;
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/// CallSiteEntry - Structure describing an entry in the call-site table.
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struct CallSiteEntry {
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unsigned BeginLabel; // zero indicates the start of the function.
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unsigned EndLabel; // zero indicates the end of the function.
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unsigned PadLabel; // zero indicates that there is no landing pad.
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unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF,
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unsigned char* StartFunction,
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unsigned char* EndFunction) const {
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assert(MMI && "MachineModuleInfo not registered!");
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// Map all labels and get rid of any dead landing pads.
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MMI->TidyLandingPads();
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const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
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const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
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const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
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if (PadInfos.empty()) return 0;
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// Sort the landing pads in order of their type ids. This is used to fold
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// duplicate actions.
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SmallVector<const LandingPadInfo *, 64> LandingPads;
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LandingPads.reserve(PadInfos.size());
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for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
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LandingPads.push_back(&PadInfos[i]);
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std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
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// Negative type ids index into FilterIds, positive type ids index into
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// TypeInfos. The value written for a positive type id is just the type
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// id itself. For a negative type id, however, the value written is the
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// (negative) byte offset of the corresponding FilterIds entry. The byte
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// offset is usually equal to the type id, because the FilterIds entries
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// are written using a variable width encoding which outputs one byte per
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// entry as long as the value written is not too large, but can differ.
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// This kind of complication does not occur for positive type ids because
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// type infos are output using a fixed width encoding.
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// FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
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SmallVector<int, 16> FilterOffsets;
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FilterOffsets.reserve(FilterIds.size());
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for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
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E = FilterIds.end(); I != E; ++I) {
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FilterOffsets.push_back(Offset);
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Offset -= MCAsmInfo::getULEB128Size(*I);
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// Compute the actions table and gather the first action index for each
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SmallVector<ActionEntry, 32> Actions;
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SmallVector<unsigned, 64> FirstActions;
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FirstActions.reserve(LandingPads.size());
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unsigned SizeActions = 0;
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for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
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const LandingPadInfo *LP = LandingPads[i];
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const std::vector<int> &TypeIds = LP->TypeIds;
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const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
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unsigned SizeSiteActions = 0;
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if (NumShared < TypeIds.size()) {
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unsigned SizeAction = 0;
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ActionEntry *PrevAction = 0;
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const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
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assert(Actions.size());
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PrevAction = &Actions.back();
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SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) +
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MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
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for (unsigned j = NumShared; j != SizePrevIds; ++j) {
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SizeAction -= MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
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SizeAction += -PrevAction->NextAction;
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PrevAction = PrevAction->Previous;
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// Compute the actions.
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for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
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int TypeID = TypeIds[I];
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assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
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int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
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unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID);
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int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
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SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction);
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SizeSiteActions += SizeAction;
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ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
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Actions.push_back(Action);
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PrevAction = &Actions.back();
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// Record the first action of the landing pad site.
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FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
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} // else identical - re-use previous FirstAction
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FirstActions.push_back(FirstAction);
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// Compute this sites contribution to size.
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SizeActions += SizeSiteActions;
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// Compute the call-site table. Entries must be ordered by address.
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SmallVector<CallSiteEntry, 64> CallSites;
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for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
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const LandingPadInfo *LandingPad = LandingPads[i];
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for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
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unsigned BeginLabel = LandingPad->BeginLabels[j];
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assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
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PadRange P = { i, j };
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PadMap[BeginLabel] = P;
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bool MayThrow = false;
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unsigned LastLabel = 0;
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for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
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for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
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if (!MI->isLabel()) {
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MayThrow |= MI->getDesc().isCall();
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unsigned BeginLabel = MI->getOperand(0).getImm();
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assert(BeginLabel && "Invalid label!");
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if (BeginLabel == LastLabel)
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RangeMapType::iterator L = PadMap.find(BeginLabel);
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if (L == PadMap.end())
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PadRange P = L->second;
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const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
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assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
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"Inconsistent landing pad map!");
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// If some instruction between the previous try-range and this one may
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// throw, create a call-site entry with no landing pad for the region
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// between the try-ranges.
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CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
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CallSites.push_back(Site);
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LastLabel = LandingPad->EndLabels[P.RangeIndex];
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CallSiteEntry Site = {BeginLabel, LastLabel,
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LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
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assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
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"Invalid landing pad!");
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// Try to merge with the previous call-site.
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if (CallSites.size()) {
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CallSiteEntry &Prev = CallSites.back();
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if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
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// Extend the range of the previous entry.
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Prev.EndLabel = Site.EndLabel;
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// Otherwise, create a new call-site.
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CallSites.push_back(Site);
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// If some instruction between the previous try-range and the end of the
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// function may throw, create a call-site entry with no landing pad for the
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// region following the try-range.
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CallSiteEntry Site = {LastLabel, 0, 0, 0};
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CallSites.push_back(Site);
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unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
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sizeof(int32_t) + // Site length.
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sizeof(int32_t)); // Landing pad.
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for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
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SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action);
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unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
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unsigned TypeOffset = sizeof(int8_t) + // Call site format
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// Call-site table length
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MCAsmInfo::getULEB128Size(SizeSites) +
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SizeSites + SizeActions + SizeTypes;
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// Begin the exception table.
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JCE->emitAlignmentWithFill(4, 0);
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// Asm->EOL("Padding");
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unsigned char* DwarfExceptionTable = (unsigned char*)JCE->getCurrentPCValue();
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JCE->emitByte(dwarf::DW_EH_PE_omit);
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// Asm->EOL("LPStart format (DW_EH_PE_omit)");
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JCE->emitByte(dwarf::DW_EH_PE_absptr);
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// Asm->EOL("TType format (DW_EH_PE_absptr)");
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JCE->emitULEB128Bytes(TypeOffset);
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// Asm->EOL("TType base offset");
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JCE->emitByte(dwarf::DW_EH_PE_udata4);
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// Asm->EOL("Call site format (DW_EH_PE_udata4)");
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JCE->emitULEB128Bytes(SizeSites);
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// Asm->EOL("Call-site table length");
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// Emit the landing pad site information.
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for (unsigned i = 0; i < CallSites.size(); ++i) {
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CallSiteEntry &S = CallSites[i];
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intptr_t BeginLabelPtr = 0;
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intptr_t EndLabelPtr = 0;
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BeginLabelPtr = (intptr_t)StartFunction;
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BeginLabelPtr = JCE->getLabelAddress(S.BeginLabel);
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JCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction);
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// Asm->EOL("Region start");
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EndLabelPtr = (intptr_t)EndFunction;
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EndLabelPtr = JCE->getLabelAddress(S.EndLabel);
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JCE->emitInt32(EndLabelPtr - BeginLabelPtr);
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//Asm->EOL("Region length");
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unsigned PadLabelPtr = JCE->getLabelAddress(S.PadLabel);
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JCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction);
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// Asm->EOL("Landing pad");
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JCE->emitULEB128Bytes(S.Action);
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// Asm->EOL("Action");
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for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
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ActionEntry &Action = Actions[I];
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JCE->emitSLEB128Bytes(Action.ValueForTypeID);
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//Asm->EOL("TypeInfo index");
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JCE->emitSLEB128Bytes(Action.NextAction);
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//Asm->EOL("Next action");
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// Emit the type ids.
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for (unsigned M = TypeInfos.size(); M; --M) {
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GlobalVariable *GV = TypeInfos[M - 1];
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if (TD->getPointerSize() == sizeof(int32_t))
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JCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV));
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JCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV));
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if (TD->getPointerSize() == sizeof(int32_t))
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// Asm->EOL("TypeInfo");
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// Emit the filter typeids.
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for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
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unsigned TypeID = FilterIds[j];
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JCE->emitULEB128Bytes(TypeID);
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//Asm->EOL("Filter TypeInfo index");
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JCE->emitAlignmentWithFill(4, 0);
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return DwarfExceptionTable;
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JITDwarfEmitter::EmitCommonEHFrame(const Function* Personality) const {
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unsigned PointerSize = TD->getPointerSize();
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int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
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PointerSize : -PointerSize;
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unsigned char* StartCommonPtr = (unsigned char*)JCE->getCurrentPCValue();
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// EH Common Frame header
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JCE->allocateSpace(4, 0);
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unsigned char* FrameCommonBeginPtr = (unsigned char*)JCE->getCurrentPCValue();
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JCE->emitInt32((int)0);
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JCE->emitByte(dwarf::DW_CIE_VERSION);
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JCE->emitString(Personality ? "zPLR" : "zR");
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JCE->emitULEB128Bytes(1);
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JCE->emitSLEB128Bytes(stackGrowth);
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JCE->emitByte(RI->getDwarfRegNum(RI->getRARegister(), true));
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// Augmentation Size: 3 small ULEBs of one byte each, and the personality
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// function which size is PointerSize.
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JCE->emitULEB128Bytes(3 + PointerSize);
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// We set the encoding of the personality as direct encoding because we use
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// the function pointer. The encoding is not relative because the current
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// PC value may be bigger than the personality function pointer.
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if (PointerSize == 4) {
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JCE->emitByte(dwarf::DW_EH_PE_sdata4);
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JCE->emitInt32(((intptr_t)Jit.getPointerToGlobal(Personality)));
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JCE->emitByte(dwarf::DW_EH_PE_sdata8);
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JCE->emitInt64(((intptr_t)Jit.getPointerToGlobal(Personality)));
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// LSDA encoding: This must match the encoding used in EmitEHFrame ()
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if (PointerSize == 4)
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JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8);
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JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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JCE->emitULEB128Bytes(1);
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JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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std::vector<MachineMove> Moves;
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RI->getInitialFrameState(Moves);
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EmitFrameMoves(0, Moves);
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JCE->emitAlignmentWithFill(PointerSize, dwarf::DW_CFA_nop);
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JCE->emitInt32At((uintptr_t*)StartCommonPtr,
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(uintptr_t)((unsigned char*)JCE->getCurrentPCValue() -
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FrameCommonBeginPtr));
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return StartCommonPtr;
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JITDwarfEmitter::EmitEHFrame(const Function* Personality,
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unsigned char* StartCommonPtr,
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unsigned char* StartFunction,
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unsigned char* EndFunction,
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unsigned char* ExceptionTable) const {
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unsigned PointerSize = TD->getPointerSize();
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unsigned char* StartEHPtr = (unsigned char*)JCE->getCurrentPCValue();
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JCE->allocateSpace(4, 0);
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unsigned char* FrameBeginPtr = (unsigned char*)JCE->getCurrentPCValue();
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JCE->emitInt32(FrameBeginPtr - StartCommonPtr);
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JCE->emitInt32(StartFunction - (unsigned char*)JCE->getCurrentPCValue());
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JCE->emitInt32(EndFunction - StartFunction);
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// If there is a personality and landing pads then point to the language
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// specific data area in the exception table.
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JCE->emitULEB128Bytes(PointerSize == 4 ? 4 : 8);
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if (PointerSize == 4) {
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if (!MMI->getLandingPads().empty())
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JCE->emitInt32(ExceptionTable-(unsigned char*)JCE->getCurrentPCValue());
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JCE->emitInt32((int)0);
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if (!MMI->getLandingPads().empty())
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JCE->emitInt64(ExceptionTable-(unsigned char*)JCE->getCurrentPCValue());
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JCE->emitInt64((int)0);
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JCE->emitULEB128Bytes(0);
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// Indicate locations of function specific callee saved registers in
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EmitFrameMoves((intptr_t)StartFunction, MMI->getFrameMoves());
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JCE->emitAlignmentWithFill(PointerSize, dwarf::DW_CFA_nop);
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// Indicate the size of the table
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JCE->emitInt32At((uintptr_t*)StartEHPtr,
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(uintptr_t)((unsigned char*)JCE->getCurrentPCValue() -
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// Double zeroes for the unwind runtime
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if (PointerSize == 8) {
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unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
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unsigned char* StartFunction,
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unsigned char* EndFunction) {
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const TargetMachine& TM = F.getTarget();
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TD = TM.getTargetData();
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stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
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RI = TM.getRegisterInfo();
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unsigned FinalSize = 0;
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FinalSize += GetExceptionTableSizeInBytes(&F);
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const std::vector<Function *> Personalities = MMI->getPersonalities();
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GetCommonEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()]);
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FinalSize += GetEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()],
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/// RoundUpToAlign - Add the specified alignment to FinalSize and returns
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static unsigned RoundUpToAlign(unsigned FinalSize, unsigned Alignment) {
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if (Alignment == 0) Alignment = 1;
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// Since we do not know where the buffer will be allocated, be pessimistic.
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return FinalSize + Alignment;
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JITDwarfEmitter::GetEHFrameSizeInBytes(const Function* Personality,
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unsigned char* StartFunction) const {
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unsigned PointerSize = TD->getPointerSize();
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unsigned FinalSize = 0;
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FinalSize += PointerSize;
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FinalSize += 3 * PointerSize;
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// If there is a personality and landing pads then point to the language
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// specific data area in the exception table.
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FinalSize += MCAsmInfo::getULEB128Size(4);
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FinalSize += PointerSize;
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FinalSize += MCAsmInfo::getULEB128Size(0);
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// Indicate locations of function specific callee saved registers in
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FinalSize += GetFrameMovesSizeInBytes((intptr_t)StartFunction,
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MMI->getFrameMoves());
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FinalSize = RoundUpToAlign(FinalSize, 4);
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// Double zeroes for the unwind runtime
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FinalSize += 2 * PointerSize;
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unsigned JITDwarfEmitter::GetCommonEHFrameSizeInBytes(const Function* Personality)
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unsigned PointerSize = TD->getPointerSize();
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int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
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PointerSize : -PointerSize;
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unsigned FinalSize = 0;
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// EH Common Frame header
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FinalSize += PointerSize;
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FinalSize += Personality ? 5 : 3; // "zPLR" or "zR"
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FinalSize += MCAsmInfo::getULEB128Size(1);
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FinalSize += MCAsmInfo::getSLEB128Size(stackGrowth);
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FinalSize += MCAsmInfo::getULEB128Size(7);
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FinalSize += PointerSize;
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FinalSize += MCAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
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FinalSize += MCAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
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FinalSize += MCAsmInfo::getULEB128Size(1);
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FinalSize += MCAsmInfo::getULEB128Size(dwarf::DW_EH_PE_pcrel);
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std::vector<MachineMove> Moves;
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RI->getInitialFrameState(Moves);
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FinalSize += GetFrameMovesSizeInBytes(0, Moves);
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FinalSize = RoundUpToAlign(FinalSize, 4);
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JITDwarfEmitter::GetFrameMovesSizeInBytes(intptr_t BaseLabelPtr,
713
const std::vector<MachineMove> &Moves) const {
714
unsigned PointerSize = TD->getPointerSize();
715
int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
716
PointerSize : -PointerSize;
717
bool IsLocal = BaseLabelPtr;
718
unsigned FinalSize = 0;
720
for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
721
const MachineMove &Move = Moves[i];
722
unsigned LabelID = Move.getLabelID();
725
LabelID = MMI->MappedLabel(LabelID);
727
// Throw out move if the label is invalid.
728
if (!LabelID) continue;
731
intptr_t LabelPtr = 0;
732
if (LabelID) LabelPtr = JCE->getLabelAddress(LabelID);
734
const MachineLocation &Dst = Move.getDestination();
735
const MachineLocation &Src = Move.getSource();
737
// Advance row if new location.
738
if (BaseLabelPtr && LabelID && (BaseLabelPtr != LabelPtr || !IsLocal)) {
740
FinalSize += PointerSize;
741
BaseLabelPtr = LabelPtr;
746
if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
748
if (Src.getReg() == MachineLocation::VirtualFP) {
752
unsigned RegNum = RI->getDwarfRegNum(Src.getReg(), true);
753
FinalSize += MCAsmInfo::getULEB128Size(RegNum);
756
int Offset = -Src.getOffset();
758
FinalSize += MCAsmInfo::getULEB128Size(Offset);
760
llvm_unreachable("Machine move no supported yet.");
762
} else if (Src.isReg() &&
763
Src.getReg() == MachineLocation::VirtualFP) {
766
unsigned RegNum = RI->getDwarfRegNum(Dst.getReg(), true);
767
FinalSize += MCAsmInfo::getULEB128Size(RegNum);
769
llvm_unreachable("Machine move no supported yet.");
772
unsigned Reg = RI->getDwarfRegNum(Src.getReg(), true);
773
int Offset = Dst.getOffset() / stackGrowth;
777
FinalSize += MCAsmInfo::getULEB128Size(Reg);
778
FinalSize += MCAsmInfo::getSLEB128Size(Offset);
779
} else if (Reg < 64) {
781
FinalSize += MCAsmInfo::getULEB128Size(Offset);
784
FinalSize += MCAsmInfo::getULEB128Size(Reg);
785
FinalSize += MCAsmInfo::getULEB128Size(Offset);
793
JITDwarfEmitter::GetExceptionTableSizeInBytes(MachineFunction* MF) const {
794
unsigned FinalSize = 0;
796
// Map all labels and get rid of any dead landing pads.
797
MMI->TidyLandingPads();
799
const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
800
const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
801
const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
802
if (PadInfos.empty()) return 0;
804
// Sort the landing pads in order of their type ids. This is used to fold
805
// duplicate actions.
806
SmallVector<const LandingPadInfo *, 64> LandingPads;
807
LandingPads.reserve(PadInfos.size());
808
for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
809
LandingPads.push_back(&PadInfos[i]);
810
std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
812
// Negative type ids index into FilterIds, positive type ids index into
813
// TypeInfos. The value written for a positive type id is just the type
814
// id itself. For a negative type id, however, the value written is the
815
// (negative) byte offset of the corresponding FilterIds entry. The byte
816
// offset is usually equal to the type id, because the FilterIds entries
817
// are written using a variable width encoding which outputs one byte per
818
// entry as long as the value written is not too large, but can differ.
819
// This kind of complication does not occur for positive type ids because
820
// type infos are output using a fixed width encoding.
821
// FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
822
SmallVector<int, 16> FilterOffsets;
823
FilterOffsets.reserve(FilterIds.size());
825
for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
826
E = FilterIds.end(); I != E; ++I) {
827
FilterOffsets.push_back(Offset);
828
Offset -= MCAsmInfo::getULEB128Size(*I);
831
// Compute the actions table and gather the first action index for each
833
SmallVector<ActionEntry, 32> Actions;
834
SmallVector<unsigned, 64> FirstActions;
835
FirstActions.reserve(LandingPads.size());
838
unsigned SizeActions = 0;
839
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
840
const LandingPadInfo *LP = LandingPads[i];
841
const std::vector<int> &TypeIds = LP->TypeIds;
842
const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
843
unsigned SizeSiteActions = 0;
845
if (NumShared < TypeIds.size()) {
846
unsigned SizeAction = 0;
847
ActionEntry *PrevAction = 0;
850
const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
851
assert(Actions.size());
852
PrevAction = &Actions.back();
853
SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) +
854
MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
855
for (unsigned j = NumShared; j != SizePrevIds; ++j) {
856
SizeAction -= MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
857
SizeAction += -PrevAction->NextAction;
858
PrevAction = PrevAction->Previous;
862
// Compute the actions.
863
for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
864
int TypeID = TypeIds[I];
865
assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
866
int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
867
unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID);
869
int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
870
SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction);
871
SizeSiteActions += SizeAction;
873
ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
874
Actions.push_back(Action);
876
PrevAction = &Actions.back();
879
// Record the first action of the landing pad site.
880
FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
881
} // else identical - re-use previous FirstAction
883
FirstActions.push_back(FirstAction);
885
// Compute this sites contribution to size.
886
SizeActions += SizeSiteActions;
889
// Compute the call-site table. Entries must be ordered by address.
890
SmallVector<CallSiteEntry, 64> CallSites;
893
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
894
const LandingPadInfo *LandingPad = LandingPads[i];
895
for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
896
unsigned BeginLabel = LandingPad->BeginLabels[j];
897
assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
898
PadRange P = { i, j };
899
PadMap[BeginLabel] = P;
903
bool MayThrow = false;
904
unsigned LastLabel = 0;
905
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
907
for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
909
if (!MI->isLabel()) {
910
MayThrow |= MI->getDesc().isCall();
914
unsigned BeginLabel = MI->getOperand(0).getImm();
915
assert(BeginLabel && "Invalid label!");
917
if (BeginLabel == LastLabel)
920
RangeMapType::iterator L = PadMap.find(BeginLabel);
922
if (L == PadMap.end())
925
PadRange P = L->second;
926
const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
928
assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
929
"Inconsistent landing pad map!");
931
// If some instruction between the previous try-range and this one may
932
// throw, create a call-site entry with no landing pad for the region
933
// between the try-ranges.
935
CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
936
CallSites.push_back(Site);
939
LastLabel = LandingPad->EndLabels[P.RangeIndex];
940
CallSiteEntry Site = {BeginLabel, LastLabel,
941
LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
943
assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
944
"Invalid landing pad!");
946
// Try to merge with the previous call-site.
947
if (CallSites.size()) {
948
CallSiteEntry &Prev = CallSites.back();
949
if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
950
// Extend the range of the previous entry.
951
Prev.EndLabel = Site.EndLabel;
956
// Otherwise, create a new call-site.
957
CallSites.push_back(Site);
960
// If some instruction between the previous try-range and the end of the
961
// function may throw, create a call-site entry with no landing pad for the
962
// region following the try-range.
964
CallSiteEntry Site = {LastLabel, 0, 0, 0};
965
CallSites.push_back(Site);
969
unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
970
sizeof(int32_t) + // Site length.
971
sizeof(int32_t)); // Landing pad.
972
for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
973
SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action);
975
unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
977
unsigned TypeOffset = sizeof(int8_t) + // Call site format
978
// Call-site table length
979
MCAsmInfo::getULEB128Size(SizeSites) +
980
SizeSites + SizeActions + SizeTypes;
982
unsigned TotalSize = sizeof(int8_t) + // LPStart format
983
sizeof(int8_t) + // TType format
984
MCAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
987
unsigned SizeAlign = (4 - TotalSize) & 3;
989
// Begin the exception table.
990
FinalSize = RoundUpToAlign(FinalSize, 4);
991
for (unsigned i = 0; i != SizeAlign; ++i) {
995
unsigned PointerSize = TD->getPointerSize();
999
// Asm->EOL("LPStart format (DW_EH_PE_omit)");
1001
// Asm->EOL("TType format (DW_EH_PE_absptr)");
1003
// Asm->EOL("TType base offset");
1005
// Asm->EOL("Call site format (DW_EH_PE_udata4)");
1007
// Asm->EOL("Call-site table length");
1009
// Emit the landing pad site information.
1010
for (unsigned i = 0; i < CallSites.size(); ++i) {
1011
CallSiteEntry &S = CallSites[i];
1013
// Asm->EOL("Region start");
1014
FinalSize += PointerSize;
1016
//Asm->EOL("Region length");
1017
FinalSize += PointerSize;
1019
// Asm->EOL("Landing pad");
1020
FinalSize += PointerSize;
1022
FinalSize += MCAsmInfo::getULEB128Size(S.Action);
1023
// Asm->EOL("Action");
1026
// Emit the actions.
1027
for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
1028
ActionEntry &Action = Actions[I];
1030
//Asm->EOL("TypeInfo index");
1031
FinalSize += MCAsmInfo::getSLEB128Size(Action.ValueForTypeID);
1032
//Asm->EOL("Next action");
1033
FinalSize += MCAsmInfo::getSLEB128Size(Action.NextAction);
1036
// Emit the type ids.
1037
for (unsigned M = TypeInfos.size(); M; --M) {
1038
// Asm->EOL("TypeInfo");
1039
FinalSize += PointerSize;
1042
// Emit the filter typeids.
1043
for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
1044
unsigned TypeID = FilterIds[j];
1045
FinalSize += MCAsmInfo::getULEB128Size(TypeID);
1046
//Asm->EOL("Filter TypeInfo index");
1049
FinalSize = RoundUpToAlign(FinalSize, 4);