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several things that were neither in an anonymous namespace nor static but not intended to be global. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51017 91177308-0d34-0410-b5e6-96231b3b80d8
1087 lines
37 KiB
C++
1087 lines
37 KiB
C++
//===----- JITDwarfEmitter.cpp - Write dwarf tables into memory -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//===----------------------------------------------------------------------===//
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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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//===----------------------------------------------------------------------===//
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#include "JIT.h"
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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/AsmPrinter.h"
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#include "llvm/CodeGen/MachineCodeEmitter.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/Target/TargetAsmInfo.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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using namespace llvm;
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JITDwarfEmitter::JITDwarfEmitter(JIT& theJit) : Jit(theJit) {}
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unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F,
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MachineCodeEmitter& mce,
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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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needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
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stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
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RI = TM.getRegisterInfo();
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MCE = &mce;
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unsigned char* ExceptionTable = EmitExceptionTable(&F, StartFunction,
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EndFunction);
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unsigned char* Result = 0;
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unsigned char* EHFramePtr = 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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return Result;
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}
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void
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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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bool IsLocal = BaseLabelPtr;
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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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if (LabelID) {
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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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}
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intptr_t LabelPtr = 0;
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if (LabelID) LabelPtr = MCE->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 && (BaseLabelPtr != LabelPtr || !IsLocal)) {
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MCE->emitByte(dwarf::DW_CFA_advance_loc4);
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if (PointerSize == 8) {
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MCE->emitInt64(LabelPtr - BaseLabelPtr);
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} else {
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MCE->emitInt32(LabelPtr - BaseLabelPtr);
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}
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BaseLabelPtr = LabelPtr;
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IsLocal = true;
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}
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// If advancing cfa.
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if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
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if (!Src.isRegister()) {
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if (Src.getRegister() == MachineLocation::VirtualFP) {
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MCE->emitByte(dwarf::DW_CFA_def_cfa_offset);
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} else {
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MCE->emitByte(dwarf::DW_CFA_def_cfa);
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MCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getRegister(), true));
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}
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int Offset = -Src.getOffset();
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MCE->emitULEB128Bytes(Offset);
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} else {
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assert(0 && "Machine move no supported yet.");
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}
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} else if (Src.isRegister() &&
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Src.getRegister() == MachineLocation::VirtualFP) {
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if (Dst.isRegister()) {
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MCE->emitByte(dwarf::DW_CFA_def_cfa_register);
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MCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getRegister(), true));
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} else {
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assert(0 && "Machine move no supported yet.");
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}
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} else {
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unsigned Reg = RI->getDwarfRegNum(Src.getRegister(), true);
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int Offset = Dst.getOffset() / stackGrowth;
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if (Offset < 0) {
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MCE->emitByte(dwarf::DW_CFA_offset_extended_sf);
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MCE->emitULEB128Bytes(Reg);
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MCE->emitSLEB128Bytes(Offset);
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} else if (Reg < 64) {
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MCE->emitByte(dwarf::DW_CFA_offset + Reg);
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MCE->emitULEB128Bytes(Offset);
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} else {
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MCE->emitByte(dwarf::DW_CFA_offset_extended);
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MCE->emitULEB128Bytes(Reg);
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MCE->emitULEB128Bytes(Offset);
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}
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}
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}
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}
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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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unsigned Count = 0;
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for (; Count != MinSize; ++Count)
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if (LIds[Count] != RIds[Count])
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return Count;
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return Count;
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}
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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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}
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namespace {
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struct KeyInfo {
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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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static bool isPod() { return true; }
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};
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/// ActionEntry - Structure describing an entry in the actions table.
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struct ActionEntry {
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int ValueForTypeID; // The value to write - may not be equal to the type id.
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int NextAction;
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struct ActionEntry *Previous;
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};
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/// PadRange - Structure holding a try-range and the associated landing pad.
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struct PadRange {
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// The index of the landing pad.
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unsigned PadIndex;
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// The index of the begin and end labels in the landing pad's label lists.
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unsigned RangeIndex;
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};
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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 Action;
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};
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}
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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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// 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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int Offset = -1;
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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 -= AsmPrinter::SizeULEB128(*I);
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}
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// Compute the actions table and gather the first action index for each
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// landing pad site.
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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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int FirstAction = 0;
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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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if (NumShared) {
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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 = AsmPrinter::SizeSLEB128(PrevAction->NextAction) +
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AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
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for (unsigned j = NumShared; j != SizePrevIds; ++j) {
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SizeAction -= AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
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SizeAction += -PrevAction->NextAction;
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PrevAction = PrevAction->Previous;
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}
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}
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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 = AsmPrinter::SizeSLEB128(ValueForTypeID);
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int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
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SizeAction = SizeTypeID + AsmPrinter::SizeSLEB128(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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}
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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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}
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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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RangeMapType PadMap;
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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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}
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}
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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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I != E; ++I) {
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for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
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MI != E; ++MI) {
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if (MI->getOpcode() != TargetInstrInfo::LABEL) {
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MayThrow |= MI->getDesc().isCall();
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continue;
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}
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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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MayThrow = false;
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RangeMapType::iterator L = PadMap.find(BeginLabel);
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if (L == PadMap.end())
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continue;
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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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if (MayThrow) {
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CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
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CallSites.push_back(Site);
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}
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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[CallSites.size()-1];
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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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continue;
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}
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}
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// Otherwise, create a new call-site.
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CallSites.push_back(Site);
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}
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}
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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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if (MayThrow) {
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CallSiteEntry Site = {LastLabel, 0, 0, 0};
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CallSites.push_back(Site);
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}
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// Final tallies.
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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 += AsmPrinter::SizeULEB128(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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AsmPrinter::SizeULEB128(SizeSites) +
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SizeSites + SizeActions + SizeTypes;
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unsigned TotalSize = sizeof(int8_t) + // LPStart format
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sizeof(int8_t) + // TType format
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AsmPrinter::SizeULEB128(TypeOffset) + // TType base offset
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TypeOffset;
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unsigned SizeAlign = (4 - TotalSize) & 3;
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// Begin the exception table.
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MCE->emitAlignment(4);
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for (unsigned i = 0; i != SizeAlign; ++i) {
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MCE->emitByte(0);
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// Asm->EOL("Padding");
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}
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unsigned char* DwarfExceptionTable = (unsigned char*)MCE->getCurrentPCValue();
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// Emit the header.
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MCE->emitByte(dwarf::DW_EH_PE_omit);
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// Asm->EOL("LPStart format (DW_EH_PE_omit)");
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MCE->emitByte(dwarf::DW_EH_PE_absptr);
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// Asm->EOL("TType format (DW_EH_PE_absptr)");
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MCE->emitULEB128Bytes(TypeOffset);
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// Asm->EOL("TType base offset");
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MCE->emitByte(dwarf::DW_EH_PE_udata4);
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// Asm->EOL("Call site format (DW_EH_PE_udata4)");
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MCE->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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if (!S.BeginLabel) {
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BeginLabelPtr = (intptr_t)StartFunction;
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if (TD->getPointerSize() == sizeof(int32_t))
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MCE->emitInt32(0);
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else
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MCE->emitInt64(0);
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} else {
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BeginLabelPtr = MCE->getLabelAddress(S.BeginLabel);
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if (TD->getPointerSize() == sizeof(int32_t))
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MCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction);
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else
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MCE->emitInt64(BeginLabelPtr - (intptr_t)StartFunction);
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}
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// Asm->EOL("Region start");
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if (!S.EndLabel) {
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EndLabelPtr = (intptr_t)EndFunction;
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if (TD->getPointerSize() == sizeof(int32_t))
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MCE->emitInt32((intptr_t)EndFunction - BeginLabelPtr);
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else
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MCE->emitInt64((intptr_t)EndFunction - BeginLabelPtr);
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} else {
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EndLabelPtr = MCE->getLabelAddress(S.EndLabel);
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if (TD->getPointerSize() == sizeof(int32_t))
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MCE->emitInt32(EndLabelPtr - BeginLabelPtr);
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else
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MCE->emitInt64(EndLabelPtr - BeginLabelPtr);
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}
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//Asm->EOL("Region length");
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if (!S.PadLabel) {
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if (TD->getPointerSize() == sizeof(int32_t))
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MCE->emitInt32(0);
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else
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MCE->emitInt64(0);
|
|
} else {
|
|
unsigned PadLabelPtr = MCE->getLabelAddress(S.PadLabel);
|
|
if (TD->getPointerSize() == sizeof(int32_t))
|
|
MCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction);
|
|
else
|
|
MCE->emitInt64(PadLabelPtr - (intptr_t)StartFunction);
|
|
}
|
|
// Asm->EOL("Landing pad");
|
|
|
|
MCE->emitULEB128Bytes(S.Action);
|
|
// Asm->EOL("Action");
|
|
}
|
|
|
|
// Emit the actions.
|
|
for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
|
|
ActionEntry &Action = Actions[I];
|
|
|
|
MCE->emitSLEB128Bytes(Action.ValueForTypeID);
|
|
//Asm->EOL("TypeInfo index");
|
|
MCE->emitSLEB128Bytes(Action.NextAction);
|
|
//Asm->EOL("Next action");
|
|
}
|
|
|
|
// Emit the type ids.
|
|
for (unsigned M = TypeInfos.size(); M; --M) {
|
|
GlobalVariable *GV = TypeInfos[M - 1];
|
|
|
|
if (GV) {
|
|
if (TD->getPointerSize() == sizeof(int32_t)) {
|
|
MCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV));
|
|
} else {
|
|
MCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV));
|
|
}
|
|
} else {
|
|
if (TD->getPointerSize() == sizeof(int32_t))
|
|
MCE->emitInt32(0);
|
|
else
|
|
MCE->emitInt64(0);
|
|
}
|
|
// Asm->EOL("TypeInfo");
|
|
}
|
|
|
|
// Emit the filter typeids.
|
|
for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
|
|
unsigned TypeID = FilterIds[j];
|
|
MCE->emitULEB128Bytes(TypeID);
|
|
//Asm->EOL("Filter TypeInfo index");
|
|
}
|
|
|
|
MCE->emitAlignment(4);
|
|
|
|
return DwarfExceptionTable;
|
|
}
|
|
|
|
unsigned char*
|
|
JITDwarfEmitter::EmitCommonEHFrame(const Function* Personality) const {
|
|
unsigned PointerSize = TD->getPointerSize();
|
|
int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
|
|
PointerSize : -PointerSize;
|
|
|
|
unsigned char* StartCommonPtr = (unsigned char*)MCE->getCurrentPCValue();
|
|
// EH Common Frame header
|
|
MCE->allocateSpace(PointerSize, 0);
|
|
unsigned char* FrameCommonBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
|
|
MCE->emitInt32((int)0);
|
|
MCE->emitByte(dwarf::DW_CIE_VERSION);
|
|
MCE->emitString(Personality ? "zPLR" : "zR");
|
|
MCE->emitULEB128Bytes(1);
|
|
MCE->emitSLEB128Bytes(stackGrowth);
|
|
MCE->emitByte(RI->getDwarfRegNum(RI->getRARegister(), true));
|
|
|
|
if (Personality) {
|
|
MCE->emitULEB128Bytes(7);
|
|
|
|
if (needsIndirectEncoding)
|
|
MCE->emitByte(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 |
|
|
dwarf::DW_EH_PE_indirect);
|
|
else
|
|
MCE->emitByte(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
|
|
|
|
if (PointerSize == 8)
|
|
MCE->emitInt64((intptr_t)Jit.getPointerToGlobal(Personality) -
|
|
MCE->getCurrentPCValue());
|
|
else
|
|
MCE->emitInt32((intptr_t)Jit.getPointerToGlobal(Personality) -
|
|
MCE->getCurrentPCValue());
|
|
|
|
MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel);
|
|
MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel);
|
|
|
|
} else {
|
|
MCE->emitULEB128Bytes(1);
|
|
MCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel);
|
|
}
|
|
|
|
std::vector<MachineMove> Moves;
|
|
RI->getInitialFrameState(Moves);
|
|
EmitFrameMoves(0, Moves);
|
|
MCE->emitAlignment(4);
|
|
|
|
MCE->emitAt((uintptr_t*)StartCommonPtr,
|
|
(uintptr_t)((unsigned char*)MCE->getCurrentPCValue() -
|
|
FrameCommonBeginPtr));
|
|
|
|
return StartCommonPtr;
|
|
}
|
|
|
|
|
|
unsigned char*
|
|
JITDwarfEmitter::EmitEHFrame(const Function* Personality,
|
|
unsigned char* StartCommonPtr,
|
|
unsigned char* StartFunction,
|
|
unsigned char* EndFunction,
|
|
unsigned char* ExceptionTable) const {
|
|
unsigned PointerSize = TD->getPointerSize();
|
|
|
|
// EH frame header.
|
|
unsigned char* StartEHPtr = (unsigned char*)MCE->getCurrentPCValue();
|
|
MCE->allocateSpace(PointerSize, 0);
|
|
unsigned char* FrameBeginPtr = (unsigned char*)MCE->getCurrentPCValue();
|
|
// FDE CIE Offset
|
|
if (PointerSize == 8) {
|
|
MCE->emitInt64(FrameBeginPtr - StartCommonPtr);
|
|
MCE->emitInt64(StartFunction - (unsigned char*)MCE->getCurrentPCValue());
|
|
MCE->emitInt64(EndFunction - StartFunction);
|
|
} else {
|
|
MCE->emitInt32(FrameBeginPtr - StartCommonPtr);
|
|
MCE->emitInt32(StartFunction - (unsigned char*)MCE->getCurrentPCValue());
|
|
MCE->emitInt32(EndFunction - StartFunction);
|
|
}
|
|
|
|
// If there is a personality and landing pads then point to the language
|
|
// specific data area in the exception table.
|
|
if (MMI->getPersonalityIndex()) {
|
|
MCE->emitULEB128Bytes(4);
|
|
|
|
if (!MMI->getLandingPads().empty()) {
|
|
if (PointerSize == 8)
|
|
MCE->emitInt64(ExceptionTable - (unsigned char*)MCE->getCurrentPCValue());
|
|
else
|
|
MCE->emitInt32(ExceptionTable - (unsigned char*)MCE->getCurrentPCValue());
|
|
} else if (PointerSize == 8) {
|
|
MCE->emitInt64((int)0);
|
|
} else {
|
|
MCE->emitInt32((int)0);
|
|
}
|
|
} else {
|
|
MCE->emitULEB128Bytes(0);
|
|
}
|
|
|
|
// Indicate locations of function specific callee saved registers in
|
|
// frame.
|
|
EmitFrameMoves((intptr_t)StartFunction, MMI->getFrameMoves());
|
|
|
|
MCE->emitAlignment(4);
|
|
|
|
// Indicate the size of the table
|
|
MCE->emitAt((uintptr_t*)StartEHPtr,
|
|
(uintptr_t)((unsigned char*)MCE->getCurrentPCValue() -
|
|
StartEHPtr));
|
|
|
|
// Double zeroes for the unwind runtime
|
|
if (PointerSize == 8) {
|
|
MCE->emitInt64(0);
|
|
MCE->emitInt64(0);
|
|
} else {
|
|
MCE->emitInt32(0);
|
|
MCE->emitInt32(0);
|
|
}
|
|
|
|
|
|
return StartEHPtr;
|
|
}
|
|
|
|
unsigned JITDwarfEmitter::GetDwarfTableSizeInBytes(MachineFunction& F,
|
|
MachineCodeEmitter& mce,
|
|
unsigned char* StartFunction,
|
|
unsigned char* EndFunction) {
|
|
const TargetMachine& TM = F.getTarget();
|
|
TD = TM.getTargetData();
|
|
needsIndirectEncoding = TM.getTargetAsmInfo()->getNeedsIndirectEncoding();
|
|
stackGrowthDirection = TM.getFrameInfo()->getStackGrowthDirection();
|
|
RI = TM.getRegisterInfo();
|
|
MCE = &mce;
|
|
unsigned FinalSize = 0;
|
|
|
|
FinalSize += GetExceptionTableSizeInBytes(&F);
|
|
|
|
const std::vector<Function *> Personalities = MMI->getPersonalities();
|
|
FinalSize += GetCommonEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()]);
|
|
|
|
FinalSize += GetEHFrameSizeInBytes(Personalities[MMI->getPersonalityIndex()], StartFunction);
|
|
|
|
return FinalSize;
|
|
}
|
|
|
|
/// RoundUpToAlign - Add the specified alignment to FinalSize and returns
|
|
/// the new value.
|
|
static unsigned RoundUpToAlign(unsigned FinalSize, unsigned Alignment) {
|
|
if (Alignment == 0) Alignment = 1;
|
|
// Since we do not know where the buffer will be allocated, be pessimistic.
|
|
return FinalSize + Alignment;
|
|
}
|
|
|
|
unsigned
|
|
JITDwarfEmitter::GetEHFrameSizeInBytes(const Function* Personality,
|
|
unsigned char* StartFunction) const {
|
|
unsigned PointerSize = TD->getPointerSize();
|
|
unsigned FinalSize = 0;
|
|
// EH frame header.
|
|
FinalSize += PointerSize;
|
|
// FDE CIE Offset
|
|
FinalSize += 3 * PointerSize;
|
|
// If there is a personality and landing pads then point to the language
|
|
// specific data area in the exception table.
|
|
if (MMI->getPersonalityIndex()) {
|
|
FinalSize += AsmPrinter::SizeULEB128(4);
|
|
FinalSize += PointerSize;
|
|
} else {
|
|
FinalSize += AsmPrinter::SizeULEB128(0);
|
|
}
|
|
|
|
// Indicate locations of function specific callee saved registers in
|
|
// frame.
|
|
FinalSize += GetFrameMovesSizeInBytes((intptr_t)StartFunction,
|
|
MMI->getFrameMoves());
|
|
|
|
FinalSize = RoundUpToAlign(FinalSize, 4);
|
|
|
|
// Double zeroes for the unwind runtime
|
|
FinalSize += 2 * PointerSize;
|
|
|
|
return FinalSize;
|
|
}
|
|
|
|
unsigned JITDwarfEmitter::GetCommonEHFrameSizeInBytes(const Function* Personality)
|
|
const {
|
|
|
|
unsigned PointerSize = TD->getPointerSize();
|
|
int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
|
|
PointerSize : -PointerSize;
|
|
unsigned FinalSize = 0;
|
|
// EH Common Frame header
|
|
FinalSize += PointerSize;
|
|
FinalSize += 4;
|
|
FinalSize += 1;
|
|
FinalSize += Personality ? 5 : 3; // "zPLR" or "zR"
|
|
FinalSize += AsmPrinter::SizeULEB128(1);
|
|
FinalSize += AsmPrinter::SizeSLEB128(stackGrowth);
|
|
FinalSize += 1;
|
|
|
|
if (Personality) {
|
|
FinalSize += AsmPrinter::SizeULEB128(7);
|
|
|
|
// Encoding
|
|
FinalSize+= 1;
|
|
//Personality
|
|
FinalSize += PointerSize;
|
|
|
|
FinalSize += AsmPrinter::SizeULEB128(dwarf::DW_EH_PE_pcrel);
|
|
FinalSize += AsmPrinter::SizeULEB128(dwarf::DW_EH_PE_pcrel);
|
|
|
|
} else {
|
|
FinalSize += AsmPrinter::SizeULEB128(1);
|
|
FinalSize += AsmPrinter::SizeULEB128(dwarf::DW_EH_PE_pcrel);
|
|
}
|
|
|
|
std::vector<MachineMove> Moves;
|
|
RI->getInitialFrameState(Moves);
|
|
FinalSize += GetFrameMovesSizeInBytes(0, Moves);
|
|
FinalSize = RoundUpToAlign(FinalSize, 4);
|
|
return FinalSize;
|
|
}
|
|
|
|
unsigned
|
|
JITDwarfEmitter::GetFrameMovesSizeInBytes(intptr_t BaseLabelPtr,
|
|
const std::vector<MachineMove> &Moves) const {
|
|
unsigned PointerSize = TD->getPointerSize();
|
|
int stackGrowth = stackGrowthDirection == TargetFrameInfo::StackGrowsUp ?
|
|
PointerSize : -PointerSize;
|
|
bool IsLocal = BaseLabelPtr;
|
|
unsigned FinalSize = 0;
|
|
|
|
for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
|
|
const MachineMove &Move = Moves[i];
|
|
unsigned LabelID = Move.getLabelID();
|
|
|
|
if (LabelID) {
|
|
LabelID = MMI->MappedLabel(LabelID);
|
|
|
|
// Throw out move if the label is invalid.
|
|
if (!LabelID) continue;
|
|
}
|
|
|
|
intptr_t LabelPtr = 0;
|
|
if (LabelID) LabelPtr = MCE->getLabelAddress(LabelID);
|
|
|
|
const MachineLocation &Dst = Move.getDestination();
|
|
const MachineLocation &Src = Move.getSource();
|
|
|
|
// Advance row if new location.
|
|
if (BaseLabelPtr && LabelID && (BaseLabelPtr != LabelPtr || !IsLocal)) {
|
|
FinalSize++;
|
|
FinalSize += PointerSize;
|
|
BaseLabelPtr = LabelPtr;
|
|
IsLocal = true;
|
|
}
|
|
|
|
// If advancing cfa.
|
|
if (Dst.isRegister() && Dst.getRegister() == MachineLocation::VirtualFP) {
|
|
if (!Src.isRegister()) {
|
|
if (Src.getRegister() == MachineLocation::VirtualFP) {
|
|
++FinalSize;
|
|
} else {
|
|
++FinalSize;
|
|
unsigned RegNum = RI->getDwarfRegNum(Src.getRegister(), true);
|
|
FinalSize += AsmPrinter::SizeULEB128(RegNum);
|
|
}
|
|
|
|
int Offset = -Src.getOffset();
|
|
|
|
FinalSize += AsmPrinter::SizeULEB128(Offset);
|
|
} else {
|
|
assert(0 && "Machine move no supported yet.");
|
|
}
|
|
} else if (Src.isRegister() &&
|
|
Src.getRegister() == MachineLocation::VirtualFP) {
|
|
if (Dst.isRegister()) {
|
|
++FinalSize;
|
|
unsigned RegNum = RI->getDwarfRegNum(Dst.getRegister(), true);
|
|
FinalSize += AsmPrinter::SizeULEB128(RegNum);
|
|
} else {
|
|
assert(0 && "Machine move no supported yet.");
|
|
}
|
|
} else {
|
|
unsigned Reg = RI->getDwarfRegNum(Src.getRegister(), true);
|
|
int Offset = Dst.getOffset() / stackGrowth;
|
|
|
|
if (Offset < 0) {
|
|
++FinalSize;
|
|
FinalSize += AsmPrinter::SizeULEB128(Reg);
|
|
FinalSize += AsmPrinter::SizeSLEB128(Offset);
|
|
} else if (Reg < 64) {
|
|
++FinalSize;
|
|
FinalSize += AsmPrinter::SizeULEB128(Offset);
|
|
} else {
|
|
++FinalSize;
|
|
FinalSize += AsmPrinter::SizeULEB128(Reg);
|
|
FinalSize += AsmPrinter::SizeULEB128(Offset);
|
|
}
|
|
}
|
|
}
|
|
return FinalSize;
|
|
}
|
|
|
|
unsigned
|
|
JITDwarfEmitter::GetExceptionTableSizeInBytes(MachineFunction* MF) const {
|
|
unsigned FinalSize = 0;
|
|
|
|
// Map all labels and get rid of any dead landing pads.
|
|
MMI->TidyLandingPads();
|
|
|
|
const std::vector<GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
|
|
const std::vector<unsigned> &FilterIds = MMI->getFilterIds();
|
|
const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
|
|
if (PadInfos.empty()) return 0;
|
|
|
|
// Sort the landing pads in order of their type ids. This is used to fold
|
|
// duplicate actions.
|
|
SmallVector<const LandingPadInfo *, 64> LandingPads;
|
|
LandingPads.reserve(PadInfos.size());
|
|
for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
|
|
LandingPads.push_back(&PadInfos[i]);
|
|
std::sort(LandingPads.begin(), LandingPads.end(), PadLT);
|
|
|
|
// Negative type ids index into FilterIds, positive type ids index into
|
|
// TypeInfos. The value written for a positive type id is just the type
|
|
// id itself. For a negative type id, however, the value written is the
|
|
// (negative) byte offset of the corresponding FilterIds entry. The byte
|
|
// offset is usually equal to the type id, because the FilterIds entries
|
|
// are written using a variable width encoding which outputs one byte per
|
|
// entry as long as the value written is not too large, but can differ.
|
|
// This kind of complication does not occur for positive type ids because
|
|
// type infos are output using a fixed width encoding.
|
|
// FilterOffsets[i] holds the byte offset corresponding to FilterIds[i].
|
|
SmallVector<int, 16> FilterOffsets;
|
|
FilterOffsets.reserve(FilterIds.size());
|
|
int Offset = -1;
|
|
for(std::vector<unsigned>::const_iterator I = FilterIds.begin(),
|
|
E = FilterIds.end(); I != E; ++I) {
|
|
FilterOffsets.push_back(Offset);
|
|
Offset -= AsmPrinter::SizeULEB128(*I);
|
|
}
|
|
|
|
// Compute the actions table and gather the first action index for each
|
|
// landing pad site.
|
|
SmallVector<ActionEntry, 32> Actions;
|
|
SmallVector<unsigned, 64> FirstActions;
|
|
FirstActions.reserve(LandingPads.size());
|
|
|
|
int FirstAction = 0;
|
|
unsigned SizeActions = 0;
|
|
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
|
|
const LandingPadInfo *LP = LandingPads[i];
|
|
const std::vector<int> &TypeIds = LP->TypeIds;
|
|
const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0;
|
|
unsigned SizeSiteActions = 0;
|
|
|
|
if (NumShared < TypeIds.size()) {
|
|
unsigned SizeAction = 0;
|
|
ActionEntry *PrevAction = 0;
|
|
|
|
if (NumShared) {
|
|
const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size();
|
|
assert(Actions.size());
|
|
PrevAction = &Actions.back();
|
|
SizeAction = AsmPrinter::SizeSLEB128(PrevAction->NextAction) +
|
|
AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
|
|
for (unsigned j = NumShared; j != SizePrevIds; ++j) {
|
|
SizeAction -= AsmPrinter::SizeSLEB128(PrevAction->ValueForTypeID);
|
|
SizeAction += -PrevAction->NextAction;
|
|
PrevAction = PrevAction->Previous;
|
|
}
|
|
}
|
|
|
|
// Compute the actions.
|
|
for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) {
|
|
int TypeID = TypeIds[I];
|
|
assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
|
|
int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID;
|
|
unsigned SizeTypeID = AsmPrinter::SizeSLEB128(ValueForTypeID);
|
|
|
|
int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
|
|
SizeAction = SizeTypeID + AsmPrinter::SizeSLEB128(NextAction);
|
|
SizeSiteActions += SizeAction;
|
|
|
|
ActionEntry Action = {ValueForTypeID, NextAction, PrevAction};
|
|
Actions.push_back(Action);
|
|
|
|
PrevAction = &Actions.back();
|
|
}
|
|
|
|
// Record the first action of the landing pad site.
|
|
FirstAction = SizeActions + SizeSiteActions - SizeAction + 1;
|
|
} // else identical - re-use previous FirstAction
|
|
|
|
FirstActions.push_back(FirstAction);
|
|
|
|
// Compute this sites contribution to size.
|
|
SizeActions += SizeSiteActions;
|
|
}
|
|
|
|
// Compute the call-site table. Entries must be ordered by address.
|
|
SmallVector<CallSiteEntry, 64> CallSites;
|
|
|
|
RangeMapType PadMap;
|
|
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
|
|
const LandingPadInfo *LandingPad = LandingPads[i];
|
|
for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
|
|
unsigned BeginLabel = LandingPad->BeginLabels[j];
|
|
assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
|
|
PadRange P = { i, j };
|
|
PadMap[BeginLabel] = P;
|
|
}
|
|
}
|
|
|
|
bool MayThrow = false;
|
|
unsigned LastLabel = 0;
|
|
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
|
|
I != E; ++I) {
|
|
for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
|
|
MI != E; ++MI) {
|
|
if (MI->getOpcode() != TargetInstrInfo::LABEL) {
|
|
MayThrow |= MI->getDesc().isCall();
|
|
continue;
|
|
}
|
|
|
|
unsigned BeginLabel = MI->getOperand(0).getImm();
|
|
assert(BeginLabel && "Invalid label!");
|
|
|
|
if (BeginLabel == LastLabel)
|
|
MayThrow = false;
|
|
|
|
RangeMapType::iterator L = PadMap.find(BeginLabel);
|
|
|
|
if (L == PadMap.end())
|
|
continue;
|
|
|
|
PadRange P = L->second;
|
|
const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
|
|
|
|
assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
|
|
"Inconsistent landing pad map!");
|
|
|
|
// If some instruction between the previous try-range and this one may
|
|
// throw, create a call-site entry with no landing pad for the region
|
|
// between the try-ranges.
|
|
if (MayThrow) {
|
|
CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
|
|
CallSites.push_back(Site);
|
|
}
|
|
|
|
LastLabel = LandingPad->EndLabels[P.RangeIndex];
|
|
CallSiteEntry Site = {BeginLabel, LastLabel,
|
|
LandingPad->LandingPadLabel, FirstActions[P.PadIndex]};
|
|
|
|
assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
|
|
"Invalid landing pad!");
|
|
|
|
// Try to merge with the previous call-site.
|
|
if (CallSites.size()) {
|
|
CallSiteEntry &Prev = CallSites[CallSites.size()-1];
|
|
if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) {
|
|
// Extend the range of the previous entry.
|
|
Prev.EndLabel = Site.EndLabel;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// Otherwise, create a new call-site.
|
|
CallSites.push_back(Site);
|
|
}
|
|
}
|
|
// If some instruction between the previous try-range and the end of the
|
|
// function may throw, create a call-site entry with no landing pad for the
|
|
// region following the try-range.
|
|
if (MayThrow) {
|
|
CallSiteEntry Site = {LastLabel, 0, 0, 0};
|
|
CallSites.push_back(Site);
|
|
}
|
|
|
|
// Final tallies.
|
|
unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start.
|
|
sizeof(int32_t) + // Site length.
|
|
sizeof(int32_t)); // Landing pad.
|
|
for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
|
|
SizeSites += AsmPrinter::SizeULEB128(CallSites[i].Action);
|
|
|
|
unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize();
|
|
|
|
unsigned TypeOffset = sizeof(int8_t) + // Call site format
|
|
// Call-site table length
|
|
AsmPrinter::SizeULEB128(SizeSites) +
|
|
SizeSites + SizeActions + SizeTypes;
|
|
|
|
unsigned TotalSize = sizeof(int8_t) + // LPStart format
|
|
sizeof(int8_t) + // TType format
|
|
AsmPrinter::SizeULEB128(TypeOffset) + // TType base offset
|
|
TypeOffset;
|
|
|
|
unsigned SizeAlign = (4 - TotalSize) & 3;
|
|
|
|
// Begin the exception table.
|
|
FinalSize = RoundUpToAlign(FinalSize, 4);
|
|
for (unsigned i = 0; i != SizeAlign; ++i) {
|
|
++FinalSize;
|
|
}
|
|
|
|
unsigned PointerSize = TD->getPointerSize();
|
|
|
|
// Emit the header.
|
|
++FinalSize;
|
|
// Asm->EOL("LPStart format (DW_EH_PE_omit)");
|
|
++FinalSize;
|
|
// Asm->EOL("TType format (DW_EH_PE_absptr)");
|
|
++FinalSize;
|
|
// Asm->EOL("TType base offset");
|
|
++FinalSize;
|
|
// Asm->EOL("Call site format (DW_EH_PE_udata4)");
|
|
++FinalSize;
|
|
// Asm->EOL("Call-site table length");
|
|
|
|
// Emit the landing pad site information.
|
|
for (unsigned i = 0; i < CallSites.size(); ++i) {
|
|
CallSiteEntry &S = CallSites[i];
|
|
|
|
// Asm->EOL("Region start");
|
|
FinalSize += PointerSize;
|
|
|
|
//Asm->EOL("Region length");
|
|
FinalSize += PointerSize;
|
|
|
|
// Asm->EOL("Landing pad");
|
|
FinalSize += PointerSize;
|
|
|
|
FinalSize += AsmPrinter::SizeULEB128(S.Action);
|
|
// Asm->EOL("Action");
|
|
}
|
|
|
|
// Emit the actions.
|
|
for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
|
|
ActionEntry &Action = Actions[I];
|
|
|
|
//Asm->EOL("TypeInfo index");
|
|
FinalSize += AsmPrinter::SizeSLEB128(Action.ValueForTypeID);
|
|
//Asm->EOL("Next action");
|
|
FinalSize += AsmPrinter::SizeSLEB128(Action.NextAction);
|
|
}
|
|
|
|
// Emit the type ids.
|
|
for (unsigned M = TypeInfos.size(); M; --M) {
|
|
// Asm->EOL("TypeInfo");
|
|
FinalSize += PointerSize;
|
|
}
|
|
|
|
// Emit the filter typeids.
|
|
for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
|
|
unsigned TypeID = FilterIds[j];
|
|
FinalSize += AsmPrinter::SizeULEB128(TypeID);
|
|
//Asm->EOL("Filter TypeInfo index");
|
|
}
|
|
|
|
FinalSize = RoundUpToAlign(FinalSize, 4);
|
|
|
|
return FinalSize;
|
|
}
|