mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-31 12:30:06 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71828 91177308-0d34-0410-b5e6-96231b3b80d8
707 lines
26 KiB
C++
707 lines
26 KiB
C++
//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
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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 contains support for writing dwarf exception info into asm files.
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfException.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineLocation.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetAsmInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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static TimerGroup &getDwarfTimerGroup() {
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static TimerGroup DwarfTimerGroup("Dwarf Exception");
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return DwarfTimerGroup;
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}
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DwarfException::DwarfException(raw_ostream &OS, AsmPrinter *A,
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const TargetAsmInfo *T)
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: Dwarf(OS, A, T, "eh"), shouldEmitTable(false), shouldEmitMoves(false),
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shouldEmitTableModule(false), shouldEmitMovesModule(false),
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ExceptionTimer(0) {
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if (TimePassesIsEnabled)
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ExceptionTimer = new Timer("Dwarf Exception Writer",
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getDwarfTimerGroup());
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}
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DwarfException::~DwarfException() {
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delete ExceptionTimer;
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}
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void DwarfException::EmitCommonEHFrame(const Function *Personality,
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unsigned Index) {
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// Size and sign of stack growth.
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int stackGrowth =
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Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
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TargetFrameInfo::StackGrowsUp ?
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TD->getPointerSize() : -TD->getPointerSize();
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// Begin eh frame section.
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Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
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if (!TAI->doesRequireNonLocalEHFrameLabel())
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O << TAI->getEHGlobalPrefix();
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O << "EH_frame" << Index << ":\n";
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EmitLabel("section_eh_frame", Index);
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// Define base labels.
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EmitLabel("eh_frame_common", Index);
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// Define the eh frame length.
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EmitDifference("eh_frame_common_end", Index,
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"eh_frame_common_begin", Index, true);
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Asm->EOL("Length of Common Information Entry");
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// EH frame header.
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EmitLabel("eh_frame_common_begin", Index);
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Asm->EmitInt32((int)0);
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Asm->EOL("CIE Identifier Tag");
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Asm->EmitInt8(dwarf::DW_CIE_VERSION);
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Asm->EOL("CIE Version");
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// The personality presence indicates that language specific information will
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// show up in the eh frame.
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Asm->EmitString(Personality ? "zPLR" : "zR");
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Asm->EOL("CIE Augmentation");
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// Round out reader.
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Asm->EmitULEB128Bytes(1);
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Asm->EOL("CIE Code Alignment Factor");
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Asm->EmitSLEB128Bytes(stackGrowth);
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Asm->EOL("CIE Data Alignment Factor");
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Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), true));
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Asm->EOL("CIE Return Address Column");
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// If there is a personality, we need to indicate the functions location.
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if (Personality) {
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Asm->EmitULEB128Bytes(7);
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Asm->EOL("Augmentation Size");
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if (TAI->getNeedsIndirectEncoding()) {
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Asm->EmitInt8(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 |
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dwarf::DW_EH_PE_indirect);
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Asm->EOL("Personality (pcrel sdata4 indirect)");
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} else {
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Asm->EmitInt8(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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Asm->EOL("Personality (pcrel sdata4)");
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}
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PrintRelDirective(true);
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O << TAI->getPersonalityPrefix();
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Asm->EmitExternalGlobal((const GlobalVariable *)(Personality));
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O << TAI->getPersonalitySuffix();
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if (strcmp(TAI->getPersonalitySuffix(), "+4@GOTPCREL"))
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O << "-" << TAI->getPCSymbol();
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Asm->EOL("Personality");
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Asm->EmitInt8(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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Asm->EOL("LSDA Encoding (pcrel sdata4)");
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Asm->EmitInt8(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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Asm->EOL("FDE Encoding (pcrel sdata4)");
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} else {
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Asm->EmitULEB128Bytes(1);
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Asm->EOL("Augmentation Size");
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Asm->EmitInt8(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4);
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Asm->EOL("FDE Encoding (pcrel sdata4)");
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}
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// Indicate locations of general callee saved registers in frame.
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std::vector<MachineMove> Moves;
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RI->getInitialFrameState(Moves);
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EmitFrameMoves(NULL, 0, Moves, true);
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// On Darwin the linker honors the alignment of eh_frame, which means it must
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// be 8-byte on 64-bit targets to match what gcc does. Otherwise you get
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// holes which confuse readers of eh_frame.
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Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
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0, 0, false);
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EmitLabel("eh_frame_common_end", Index);
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Asm->EOL();
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}
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/// EmitEHFrame - Emit function exception frame information.
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///
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void DwarfException::EmitEHFrame(const FunctionEHFrameInfo &EHFrameInfo) {
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assert(!EHFrameInfo.function->hasAvailableExternallyLinkage() &&
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"Should not emit 'available externally' functions at all");
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Function::LinkageTypes linkage = EHFrameInfo.function->getLinkage();
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Asm->SwitchToTextSection(TAI->getDwarfEHFrameSection());
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// Externally visible entry into the functions eh frame info. If the
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// corresponding function is static, this should not be externally visible.
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if (linkage != Function::InternalLinkage &&
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linkage != Function::PrivateLinkage) {
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if (const char *GlobalEHDirective = TAI->getGlobalEHDirective())
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O << GlobalEHDirective << EHFrameInfo.FnName << "\n";
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}
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// If corresponding function is weak definition, this should be too.
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if ((linkage == Function::WeakAnyLinkage ||
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linkage == Function::WeakODRLinkage ||
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linkage == Function::LinkOnceAnyLinkage ||
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linkage == Function::LinkOnceODRLinkage) &&
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TAI->getWeakDefDirective())
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O << TAI->getWeakDefDirective() << EHFrameInfo.FnName << "\n";
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// If there are no calls then you can't unwind. This may mean we can omit the
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// EH Frame, but some environments do not handle weak absolute symbols. If
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// UnwindTablesMandatory is set we cannot do this optimization; the unwind
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// info is to be available for non-EH uses.
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if (!EHFrameInfo.hasCalls &&
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!UnwindTablesMandatory &&
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((linkage != Function::WeakAnyLinkage &&
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linkage != Function::WeakODRLinkage &&
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linkage != Function::LinkOnceAnyLinkage &&
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linkage != Function::LinkOnceODRLinkage) ||
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!TAI->getWeakDefDirective() ||
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TAI->getSupportsWeakOmittedEHFrame())) {
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O << EHFrameInfo.FnName << " = 0\n";
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// This name has no connection to the function, so it might get
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// dead-stripped when the function is not, erroneously. Prohibit
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// dead-stripping unconditionally.
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if (const char *UsedDirective = TAI->getUsedDirective())
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O << UsedDirective << EHFrameInfo.FnName << "\n\n";
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} else {
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O << EHFrameInfo.FnName << ":\n";
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// EH frame header.
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EmitDifference("eh_frame_end", EHFrameInfo.Number,
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"eh_frame_begin", EHFrameInfo.Number, true);
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Asm->EOL("Length of Frame Information Entry");
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EmitLabel("eh_frame_begin", EHFrameInfo.Number);
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if (TAI->doesRequireNonLocalEHFrameLabel()) {
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PrintRelDirective(true, true);
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PrintLabelName("eh_frame_begin", EHFrameInfo.Number);
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if (!TAI->isAbsoluteEHSectionOffsets())
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O << "-EH_frame" << EHFrameInfo.PersonalityIndex;
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} else {
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EmitSectionOffset("eh_frame_begin", "eh_frame_common",
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EHFrameInfo.Number, EHFrameInfo.PersonalityIndex,
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true, true, false);
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}
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Asm->EOL("FDE CIE offset");
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EmitReference("eh_func_begin", EHFrameInfo.Number, true, true);
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Asm->EOL("FDE initial location");
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EmitDifference("eh_func_end", EHFrameInfo.Number,
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"eh_func_begin", EHFrameInfo.Number, true);
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Asm->EOL("FDE address range");
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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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if (EHFrameInfo.PersonalityIndex) {
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Asm->EmitULEB128Bytes(4);
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Asm->EOL("Augmentation size");
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if (EHFrameInfo.hasLandingPads)
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EmitReference("exception", EHFrameInfo.Number, true, true);
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else
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Asm->EmitInt32((int)0);
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Asm->EOL("Language Specific Data Area");
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} else {
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Asm->EmitULEB128Bytes(0);
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Asm->EOL("Augmentation size");
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}
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// Indicate locations of function specific callee saved registers in frame.
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EmitFrameMoves("eh_func_begin", EHFrameInfo.Number, EHFrameInfo.Moves,
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true);
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// On Darwin the linker honors the alignment of eh_frame, which means it
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// must be 8-byte on 64-bit targets to match what gcc does. Otherwise you
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// get holes which confuse readers of eh_frame.
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Asm->EmitAlignment(TD->getPointerSize() == sizeof(int32_t) ? 2 : 3,
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0, 0, false);
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EmitLabel("eh_frame_end", EHFrameInfo.Number);
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// If the function is marked used, this table should be also. We cannot
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// make the mark unconditional in this case, since retaining the table also
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// retains the function in this case, and there is code around that depends
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// on unused functions (calling undefined externals) being dead-stripped to
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// link correctly. Yes, there really is.
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if (MMI->getUsedFunctions().count(EHFrameInfo.function))
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if (const char *UsedDirective = TAI->getUsedDirective())
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O << UsedDirective << EHFrameInfo.FnName << "\n\n";
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}
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}
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/// EmitExceptionTable - Emit landing pads and actions.
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///
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/// The general organization of the table is complex, but the basic concepts are
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/// easy. First there is a header which describes the location and organization
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/// of the three components that follow.
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///
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/// 1. The landing pad site information describes the range of code covered by
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/// the try. In our case it's an accumulation of the ranges covered by the
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/// invokes in the try. There is also a reference to the landing pad that
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/// handles the exception once processed. Finally an index into the actions
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/// table.
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/// 2. The action table, in our case, is composed of pairs of type ids and next
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/// action offset. Starting with the action index from the landing pad
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/// site, each type Id is checked for a match to the current exception. If
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/// it matches then the exception and type id are passed on to the landing
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/// pad. Otherwise the next action is looked up. This chain is terminated
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/// with a next action of zero. If no type id is found the the frame is
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/// unwound and handling continues.
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/// 3. Type id table contains references to all the C++ typeinfo for all
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/// catches in the function. This tables is reversed indexed base 1.
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/// SharedTypeIds - How many leading type ids two landing pads have in common.
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unsigned DwarfException::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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bool DwarfException::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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void DwarfException::EmitExceptionTable() {
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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;
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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 id
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// 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 are
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// written using a variable width encoding which outputs one byte per entry as
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// long as the value written is not too large, but can differ. This kind of
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// complication does not occur for positive type ids because type infos are
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// output using a fixed width encoding. FilterOffsets[i] holds the byte
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// 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 -= TargetAsmInfo::getULEB128Size(*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 = TargetAsmInfo::getSLEB128Size(PrevAction->NextAction) +
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TargetAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID);
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for (unsigned j = NumShared; j != SizePrevIds; ++j) {
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SizeAction -=
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TargetAsmInfo::getSLEB128Size(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 = TargetAsmInfo::getSLEB128Size(ValueForTypeID);
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int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0;
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SizeAction = SizeTypeID + TargetAsmInfo::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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}
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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. The entry for an invoke has a try-range
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// containing the call, a non-zero landing pad and an appropriate action. The
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// entry for an ordinary call has a try-range containing the call and zero for
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// the landing pad and the action. Calls marked 'nounwind' have no entry and
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// must not be contained in the try-range of any entry - they form gaps in the
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// table. Entries must be ordered by try-range address.
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SmallVector<CallSiteEntry, 64> CallSites;
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RangeMapType PadMap;
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// Invokes and nounwind calls have entries in PadMap (due to being bracketed
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// by try-range labels when lowered). Ordinary calls do not, so appropriate
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// try-ranges for them need be deduced.
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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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// The end label of the previous invoke or nounwind try-range.
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unsigned LastLabel = 0;
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// Whether there is a potentially throwing instruction (currently this means
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// an ordinary call) between the end of the previous try-range and now.
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bool SawPotentiallyThrowing = false;
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// Whether the last callsite entry was for an invoke.
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bool PreviousIsInvoke = false;
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// Visit all instructions in order of address.
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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->isLabel()) {
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SawPotentiallyThrowing |= 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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// End of the previous try-range?
|
|
if (BeginLabel == LastLabel)
|
|
SawPotentiallyThrowing = false;
|
|
|
|
// Beginning of a new try-range?
|
|
RangeMapType::iterator L = PadMap.find(BeginLabel);
|
|
if (L == PadMap.end())
|
|
// Nope, it was just some random label.
|
|
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 (SawPotentiallyThrowing) {
|
|
CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0};
|
|
CallSites.push_back(Site);
|
|
PreviousIsInvoke = false;
|
|
}
|
|
|
|
LastLabel = LandingPad->EndLabels[P.RangeIndex];
|
|
assert(BeginLabel && LastLabel && "Invalid landing pad!");
|
|
|
|
if (LandingPad->LandingPadLabel) {
|
|
// This try-range is for an invoke.
|
|
CallSiteEntry Site = {BeginLabel, LastLabel,
|
|
LandingPad->LandingPadLabel,
|
|
FirstActions[P.PadIndex]};
|
|
|
|
// Try to merge with the previous call-site.
|
|
if (PreviousIsInvoke) {
|
|
CallSiteEntry &Prev = CallSites.back();
|
|
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);
|
|
PreviousIsInvoke = true;
|
|
} else {
|
|
// Create a gap.
|
|
PreviousIsInvoke = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
// 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 (SawPotentiallyThrowing) {
|
|
CallSiteEntry Site = {LastLabel, 0, 0, 0};
|
|
CallSites.push_back(Site);
|
|
}
|
|
|
|
// Final tallies.
|
|
|
|
// Call sites.
|
|
const unsigned SiteStartSize = sizeof(int32_t); // DW_EH_PE_udata4
|
|
const unsigned SiteLengthSize = sizeof(int32_t); // DW_EH_PE_udata4
|
|
const unsigned LandingPadSize = sizeof(int32_t); // DW_EH_PE_udata4
|
|
unsigned SizeSites = CallSites.size() * (SiteStartSize +
|
|
SiteLengthSize +
|
|
LandingPadSize);
|
|
for (unsigned i = 0, e = CallSites.size(); i < e; ++i)
|
|
SizeSites += TargetAsmInfo::getULEB128Size(CallSites[i].Action);
|
|
|
|
// Type infos.
|
|
const unsigned TypeInfoSize = TD->getPointerSize(); // DW_EH_PE_absptr
|
|
unsigned SizeTypes = TypeInfos.size() * TypeInfoSize;
|
|
|
|
unsigned TypeOffset = sizeof(int8_t) + // Call site format
|
|
TargetAsmInfo::getULEB128Size(SizeSites) + // Call-site table length
|
|
SizeSites + SizeActions + SizeTypes;
|
|
|
|
unsigned TotalSize = sizeof(int8_t) + // LPStart format
|
|
sizeof(int8_t) + // TType format
|
|
TargetAsmInfo::getULEB128Size(TypeOffset) + // TType base offset
|
|
TypeOffset;
|
|
|
|
unsigned SizeAlign = (4 - TotalSize) & 3;
|
|
|
|
// Begin the exception table.
|
|
Asm->SwitchToDataSection(TAI->getDwarfExceptionSection());
|
|
Asm->EmitAlignment(2, 0, 0, false);
|
|
O << "GCC_except_table" << SubprogramCount << ":\n";
|
|
|
|
for (unsigned i = 0; i != SizeAlign; ++i) {
|
|
Asm->EmitInt8(0);
|
|
Asm->EOL("Padding");
|
|
}
|
|
|
|
EmitLabel("exception", SubprogramCount);
|
|
|
|
// Emit the header.
|
|
Asm->EmitInt8(dwarf::DW_EH_PE_omit);
|
|
Asm->EOL("LPStart format (DW_EH_PE_omit)");
|
|
Asm->EmitInt8(dwarf::DW_EH_PE_absptr);
|
|
Asm->EOL("TType format (DW_EH_PE_absptr)");
|
|
Asm->EmitULEB128Bytes(TypeOffset);
|
|
Asm->EOL("TType base offset");
|
|
Asm->EmitInt8(dwarf::DW_EH_PE_udata4);
|
|
Asm->EOL("Call site format (DW_EH_PE_udata4)");
|
|
Asm->EmitULEB128Bytes(SizeSites);
|
|
Asm->EOL("Call-site table length");
|
|
|
|
// Emit the landing pad site information.
|
|
for (unsigned i = 0; i < CallSites.size(); ++i) {
|
|
CallSiteEntry &S = CallSites[i];
|
|
const char *BeginTag;
|
|
unsigned BeginNumber;
|
|
|
|
if (!S.BeginLabel) {
|
|
BeginTag = "eh_func_begin";
|
|
BeginNumber = SubprogramCount;
|
|
} else {
|
|
BeginTag = "label";
|
|
BeginNumber = S.BeginLabel;
|
|
}
|
|
|
|
EmitSectionOffset(BeginTag, "eh_func_begin", BeginNumber, SubprogramCount,
|
|
true, true);
|
|
Asm->EOL("Region start");
|
|
|
|
if (!S.EndLabel)
|
|
EmitDifference("eh_func_end", SubprogramCount, BeginTag, BeginNumber,
|
|
true);
|
|
else
|
|
EmitDifference("label", S.EndLabel, BeginTag, BeginNumber, true);
|
|
|
|
Asm->EOL("Region length");
|
|
|
|
if (!S.PadLabel)
|
|
Asm->EmitInt32(0);
|
|
else
|
|
EmitSectionOffset("label", "eh_func_begin", S.PadLabel, SubprogramCount,
|
|
true, true);
|
|
|
|
Asm->EOL("Landing pad");
|
|
|
|
Asm->EmitULEB128Bytes(S.Action);
|
|
Asm->EOL("Action");
|
|
}
|
|
|
|
// Emit the actions.
|
|
for (unsigned I = 0, N = Actions.size(); I != N; ++I) {
|
|
ActionEntry &Action = Actions[I];
|
|
|
|
Asm->EmitSLEB128Bytes(Action.ValueForTypeID);
|
|
Asm->EOL("TypeInfo index");
|
|
Asm->EmitSLEB128Bytes(Action.NextAction);
|
|
Asm->EOL("Next action");
|
|
}
|
|
|
|
// Emit the type ids.
|
|
for (unsigned M = TypeInfos.size(); M; --M) {
|
|
GlobalVariable *GV = TypeInfos[M - 1];
|
|
PrintRelDirective();
|
|
|
|
if (GV) {
|
|
std::string GLN;
|
|
O << Asm->getGlobalLinkName(GV, GLN);
|
|
} else {
|
|
O << "0";
|
|
}
|
|
|
|
Asm->EOL("TypeInfo");
|
|
}
|
|
|
|
// Emit the filter typeids.
|
|
for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) {
|
|
unsigned TypeID = FilterIds[j];
|
|
Asm->EmitULEB128Bytes(TypeID);
|
|
Asm->EOL("Filter TypeInfo index");
|
|
}
|
|
|
|
Asm->EmitAlignment(2, 0, 0, false);
|
|
}
|
|
|
|
/// EndModule - Emit all exception information that should come after the
|
|
/// content.
|
|
void DwarfException::EndModule() {
|
|
if (TimePassesIsEnabled)
|
|
ExceptionTimer->startTimer();
|
|
|
|
if (shouldEmitMovesModule || shouldEmitTableModule) {
|
|
const std::vector<Function *> Personalities = MMI->getPersonalities();
|
|
for (unsigned i = 0; i < Personalities.size(); ++i)
|
|
EmitCommonEHFrame(Personalities[i], i);
|
|
|
|
for (std::vector<FunctionEHFrameInfo>::iterator I = EHFrames.begin(),
|
|
E = EHFrames.end(); I != E; ++I)
|
|
EmitEHFrame(*I);
|
|
}
|
|
|
|
if (TimePassesIsEnabled)
|
|
ExceptionTimer->stopTimer();
|
|
}
|
|
|
|
/// BeginFunction - Gather pre-function exception information. Assumes being
|
|
/// emitted immediately after the function entry point.
|
|
void DwarfException::BeginFunction(MachineFunction *MF) {
|
|
if (TimePassesIsEnabled)
|
|
ExceptionTimer->startTimer();
|
|
|
|
this->MF = MF;
|
|
shouldEmitTable = shouldEmitMoves = false;
|
|
|
|
if (MMI && TAI->doesSupportExceptionHandling()) {
|
|
// Map all labels and get rid of any dead landing pads.
|
|
MMI->TidyLandingPads();
|
|
|
|
// If any landing pads survive, we need an EH table.
|
|
if (MMI->getLandingPads().size())
|
|
shouldEmitTable = true;
|
|
|
|
// See if we need frame move info.
|
|
if (!MF->getFunction()->doesNotThrow() || UnwindTablesMandatory)
|
|
shouldEmitMoves = true;
|
|
|
|
if (shouldEmitMoves || shouldEmitTable)
|
|
// Assumes in correct section after the entry point.
|
|
EmitLabel("eh_func_begin", ++SubprogramCount);
|
|
}
|
|
|
|
shouldEmitTableModule |= shouldEmitTable;
|
|
shouldEmitMovesModule |= shouldEmitMoves;
|
|
|
|
if (TimePassesIsEnabled)
|
|
ExceptionTimer->stopTimer();
|
|
}
|
|
|
|
/// EndFunction - Gather and emit post-function exception information.
|
|
///
|
|
void DwarfException::EndFunction() {
|
|
if (TimePassesIsEnabled)
|
|
ExceptionTimer->startTimer();
|
|
|
|
if (shouldEmitMoves || shouldEmitTable) {
|
|
EmitLabel("eh_func_end", SubprogramCount);
|
|
EmitExceptionTable();
|
|
|
|
// Save EH frame information
|
|
std::string Name;
|
|
EHFrames.push_back(
|
|
FunctionEHFrameInfo(getAsm()->getCurrentFunctionEHName(MF, Name),
|
|
SubprogramCount,
|
|
MMI->getPersonalityIndex(),
|
|
MF->getFrameInfo()->hasCalls(),
|
|
!MMI->getLandingPads().empty(),
|
|
MMI->getFrameMoves(),
|
|
MF->getFunction()));
|
|
}
|
|
|
|
if (TimePassesIsEnabled)
|
|
ExceptionTimer->stopTimer();
|
|
}
|