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authorpatrick <patrick@openbsd.org>2020-08-03 15:06:44 +0000
committerpatrick <patrick@openbsd.org>2020-08-03 15:06:44 +0000
commitb64793999546ed8adebaeebd9d8345d18db8927d (patch)
tree4357c27b561d73b0e089727c6ed659f2ceff5f47 /gnu/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp
parentAdd support for UTF-8 DISPLAY-HINTs with octet length. For now only (diff)
downloadwireguard-openbsd-b64793999546ed8adebaeebd9d8345d18db8927d.tar.xz
wireguard-openbsd-b64793999546ed8adebaeebd9d8345d18db8927d.zip
Remove LLVM 8.0.1 files.
Diffstat (limited to 'gnu/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp')
-rw-r--r--gnu/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp654
1 files changed, 0 insertions, 654 deletions
diff --git a/gnu/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp b/gnu/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp
deleted file mode 100644
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--- a/gnu/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp
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@@ -1,654 +0,0 @@
-//===- CodeGen/AsmPrinter/EHStreamer.cpp - Exception Directive Streamer ---===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains support for writing exception info into assembly files.
-//
-//===----------------------------------------------------------------------===//
-
-#include "EHStreamer.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/Twine.h"
-#include "llvm/ADT/iterator_range.h"
-#include "llvm/BinaryFormat/Dwarf.h"
-#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineInstr.h"
-#include "llvm/CodeGen/MachineOperand.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/Function.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCStreamer.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCTargetOptions.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/LEB128.h"
-#include "llvm/Target/TargetLoweringObjectFile.h"
-#include <algorithm>
-#include <cassert>
-#include <cstdint>
-#include <vector>
-
-using namespace llvm;
-
-EHStreamer::EHStreamer(AsmPrinter *A) : Asm(A), MMI(Asm->MMI) {}
-
-EHStreamer::~EHStreamer() = default;
-
-/// How many leading type ids two landing pads have in common.
-unsigned EHStreamer::sharedTypeIDs(const LandingPadInfo *L,
- const LandingPadInfo *R) {
- const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds;
- unsigned LSize = LIds.size(), RSize = RIds.size();
- unsigned MinSize = LSize < RSize ? LSize : RSize;
- unsigned Count = 0;
-
- for (; Count != MinSize; ++Count)
- if (LIds[Count] != RIds[Count])
- return Count;
-
- return Count;
-}
-
-/// Compute the actions table and gather the first action index for each landing
-/// pad site.
-void EHStreamer::computeActionsTable(
- const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
- SmallVectorImpl<ActionEntry> &Actions,
- SmallVectorImpl<unsigned> &FirstActions) {
- // The action table follows the call-site table in the LSDA. The individual
- // records are of two types:
- //
- // * Catch clause
- // * Exception specification
- //
- // The two record kinds have the same format, with only small differences.
- // They are distinguished by the "switch value" field: Catch clauses
- // (TypeInfos) have strictly positive switch values, and exception
- // specifications (FilterIds) have strictly negative switch values. Value 0
- // indicates a catch-all clause.
- //
- // 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].
-
- const std::vector<unsigned> &FilterIds = Asm->MF->getFilterIds();
- 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 -= getULEB128Size(*I);
- }
-
- FirstActions.reserve(LandingPads.size());
-
- int FirstAction = 0;
- unsigned SizeActions = 0; // Total size of all action entries for a function
- const LandingPadInfo *PrevLPI = nullptr;
-
- for (SmallVectorImpl<const LandingPadInfo *>::const_iterator
- I = LandingPads.begin(), E = LandingPads.end(); I != E; ++I) {
- const LandingPadInfo *LPI = *I;
- const std::vector<int> &TypeIds = LPI->TypeIds;
- unsigned NumShared = PrevLPI ? sharedTypeIDs(LPI, PrevLPI) : 0;
- unsigned SizeSiteActions = 0; // Total size of all entries for a landingpad
-
- if (NumShared < TypeIds.size()) {
- // Size of one action entry (typeid + next action)
- unsigned SizeActionEntry = 0;
- unsigned PrevAction = (unsigned)-1;
-
- if (NumShared) {
- unsigned SizePrevIds = PrevLPI->TypeIds.size();
- assert(Actions.size());
- PrevAction = Actions.size() - 1;
- SizeActionEntry = getSLEB128Size(Actions[PrevAction].NextAction) +
- getSLEB128Size(Actions[PrevAction].ValueForTypeID);
-
- for (unsigned j = NumShared; j != SizePrevIds; ++j) {
- assert(PrevAction != (unsigned)-1 && "PrevAction is invalid!");
- SizeActionEntry -= getSLEB128Size(Actions[PrevAction].ValueForTypeID);
- SizeActionEntry += -Actions[PrevAction].NextAction;
- PrevAction = Actions[PrevAction].Previous;
- }
- }
-
- // Compute the actions.
- for (unsigned J = NumShared, M = TypeIds.size(); J != M; ++J) {
- int TypeID = TypeIds[J];
- assert(-1 - TypeID < (int)FilterOffsets.size() && "Unknown filter id!");
- int ValueForTypeID =
- isFilterEHSelector(TypeID) ? FilterOffsets[-1 - TypeID] : TypeID;
- unsigned SizeTypeID = getSLEB128Size(ValueForTypeID);
-
- int NextAction = SizeActionEntry ? -(SizeActionEntry + SizeTypeID) : 0;
- SizeActionEntry = SizeTypeID + getSLEB128Size(NextAction);
- SizeSiteActions += SizeActionEntry;
-
- ActionEntry Action = { ValueForTypeID, NextAction, PrevAction };
- Actions.push_back(Action);
- PrevAction = Actions.size() - 1;
- }
-
- // Record the first action of the landing pad site.
- FirstAction = SizeActions + SizeSiteActions - SizeActionEntry + 1;
- } // else identical - re-use previous FirstAction
-
- // Information used when creating the call-site table. The action record
- // field of the call site record is the offset of the first associated
- // action record, relative to the start of the actions table. This value is
- // biased by 1 (1 indicating the start of the actions table), and 0
- // indicates that there are no actions.
- FirstActions.push_back(FirstAction);
-
- // Compute this sites contribution to size.
- SizeActions += SizeSiteActions;
-
- PrevLPI = LPI;
- }
-}
-
-/// Return `true' if this is a call to a function marked `nounwind'. Return
-/// `false' otherwise.
-bool EHStreamer::callToNoUnwindFunction(const MachineInstr *MI) {
- assert(MI->isCall() && "This should be a call instruction!");
-
- bool MarkedNoUnwind = false;
- bool SawFunc = false;
-
- for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
- const MachineOperand &MO = MI->getOperand(I);
-
- if (!MO.isGlobal()) continue;
-
- const Function *F = dyn_cast<Function>(MO.getGlobal());
- if (!F) continue;
-
- if (SawFunc) {
- // Be conservative. If we have more than one function operand for this
- // call, then we can't make the assumption that it's the callee and
- // not a parameter to the call.
- //
- // FIXME: Determine if there's a way to say that `F' is the callee or
- // parameter.
- MarkedNoUnwind = false;
- break;
- }
-
- MarkedNoUnwind = F->doesNotThrow();
- SawFunc = true;
- }
-
- return MarkedNoUnwind;
-}
-
-void EHStreamer::computePadMap(
- const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
- RangeMapType &PadMap) {
- // Invokes and nounwind calls have entries in PadMap (due to being bracketed
- // by try-range labels when lowered). Ordinary calls do not, so appropriate
- // try-ranges for them need be deduced so we can put them in the LSDA.
- 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) {
- MCSymbol *BeginLabel = LandingPad->BeginLabels[j];
- assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
- PadRange P = { i, j };
- PadMap[BeginLabel] = P;
- }
- }
-}
-
-/// Compute the call-site table. The entry for an invoke has a try-range
-/// containing the call, a non-zero landing pad, and an appropriate action. The
-/// entry for an ordinary call has a try-range containing the call and zero for
-/// the landing pad and the action. Calls marked 'nounwind' have no entry and
-/// must not be contained in the try-range of any entry - they form gaps in the
-/// table. Entries must be ordered by try-range address.
-void EHStreamer::
-computeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
- const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
- const SmallVectorImpl<unsigned> &FirstActions) {
- RangeMapType PadMap;
- computePadMap(LandingPads, PadMap);
-
- // The end label of the previous invoke or nounwind try-range.
- MCSymbol *LastLabel = nullptr;
-
- // Whether there is a potentially throwing instruction (currently this means
- // an ordinary call) between the end of the previous try-range and now.
- bool SawPotentiallyThrowing = false;
-
- // Whether the last CallSite entry was for an invoke.
- bool PreviousIsInvoke = false;
-
- bool IsSJLJ = Asm->MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
-
- // Visit all instructions in order of address.
- for (const auto &MBB : *Asm->MF) {
- for (const auto &MI : MBB) {
- if (!MI.isEHLabel()) {
- if (MI.isCall())
- SawPotentiallyThrowing |= !callToNoUnwindFunction(&MI);
- continue;
- }
-
- // End of the previous try-range?
- MCSymbol *BeginLabel = MI.getOperand(0).getMCSymbol();
- if (BeginLabel == LastLabel)
- SawPotentiallyThrowing = false;
-
- // Beginning of a new try-range?
- RangeMapType::const_iterator L = PadMap.find(BeginLabel);
- if (L == PadMap.end())
- // Nope, it was just some random label.
- continue;
-
- const PadRange &P = L->second;
- const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
- assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
- "Inconsistent landing pad map!");
-
- // For Dwarf exception handling (SjLj handling doesn't use this). 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 && Asm->MAI->usesCFIForEH()) {
- CallSiteEntry Site = { LastLabel, BeginLabel, nullptr, 0 };
- CallSites.push_back(Site);
- PreviousIsInvoke = false;
- }
-
- LastLabel = LandingPad->EndLabels[P.RangeIndex];
- assert(BeginLabel && LastLabel && "Invalid landing pad!");
-
- if (!LandingPad->LandingPadLabel) {
- // Create a gap.
- PreviousIsInvoke = false;
- } else {
- // This try-range is for an invoke.
- CallSiteEntry Site = {
- BeginLabel,
- LastLabel,
- LandingPad,
- FirstActions[P.PadIndex]
- };
-
- // Try to merge with the previous call-site. SJLJ doesn't do this
- if (PreviousIsInvoke && !IsSJLJ) {
- CallSiteEntry &Prev = CallSites.back();
- if (Site.LPad == Prev.LPad && Site.Action == Prev.Action) {
- // Extend the range of the previous entry.
- Prev.EndLabel = Site.EndLabel;
- continue;
- }
- }
-
- // Otherwise, create a new call-site.
- if (!IsSJLJ)
- CallSites.push_back(Site);
- else {
- // SjLj EH must maintain the call sites in the order assigned
- // to them by the SjLjPrepare pass.
- unsigned SiteNo = Asm->MF->getCallSiteBeginLabel(BeginLabel);
- if (CallSites.size() < SiteNo)
- CallSites.resize(SiteNo);
- CallSites[SiteNo - 1] = Site;
- }
- PreviousIsInvoke = true;
- }
- }
- }
-
- // 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 && !IsSJLJ) {
- CallSiteEntry Site = { LastLabel, nullptr, nullptr, 0 };
- CallSites.push_back(Site);
- }
-}
-
-/// Emit landing pads and actions.
-///
-/// The general organization of the table is complex, but the basic concepts are
-/// easy. First there is a header which describes the location and organization
-/// of the three components that follow.
-///
-/// 1. The landing pad site information describes the range of code covered by
-/// the try. In our case it's an accumulation of the ranges covered by the
-/// invokes in the try. There is also a reference to the landing pad that
-/// handles the exception once processed. Finally an index into the actions
-/// table.
-/// 2. The action table, in our case, is composed of pairs of type IDs and next
-/// action offset. Starting with the action index from the landing pad
-/// site, each type ID is checked for a match to the current exception. If
-/// it matches then the exception and type id are passed on to the landing
-/// pad. Otherwise the next action is looked up. This chain is terminated
-/// with a next action of zero. If no type id is found then the frame is
-/// unwound and handling continues.
-/// 3. Type ID table contains references to all the C++ typeinfo for all
-/// catches in the function. This tables is reverse indexed base 1.
-///
-/// Returns the starting symbol of an exception table.
-MCSymbol *EHStreamer::emitExceptionTable() {
- const MachineFunction *MF = Asm->MF;
- const std::vector<const GlobalValue *> &TypeInfos = MF->getTypeInfos();
- const std::vector<unsigned> &FilterIds = MF->getFilterIds();
- const std::vector<LandingPadInfo> &PadInfos = MF->getLandingPads();
-
- // 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]);
-
- // Order landing pads lexicographically by type id.
- llvm::sort(LandingPads, [](const LandingPadInfo *L, const LandingPadInfo *R) {
- return L->TypeIds < R->TypeIds;
- });
-
- // Compute the actions table and gather the first action index for each
- // landing pad site.
- SmallVector<ActionEntry, 32> Actions;
- SmallVector<unsigned, 64> FirstActions;
- computeActionsTable(LandingPads, Actions, FirstActions);
-
- // Compute the call-site table.
- SmallVector<CallSiteEntry, 64> CallSites;
- computeCallSiteTable(CallSites, LandingPads, FirstActions);
-
- bool IsSJLJ = Asm->MAI->getExceptionHandlingType() == ExceptionHandling::SjLj;
- bool IsWasm = Asm->MAI->getExceptionHandlingType() == ExceptionHandling::Wasm;
- unsigned CallSiteEncoding =
- IsSJLJ ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_uleb128;
- bool HaveTTData = !TypeInfos.empty() || !FilterIds.empty();
-
- // Type infos.
- MCSection *LSDASection = Asm->getObjFileLowering().getLSDASection();
- unsigned TTypeEncoding;
-
- if (!HaveTTData) {
- // If there is no TypeInfo, then we just explicitly say that we're omitting
- // that bit.
- TTypeEncoding = dwarf::DW_EH_PE_omit;
- } else {
- // Okay, we have actual filters or typeinfos to emit. As such, we need to
- // pick a type encoding for them. We're about to emit a list of pointers to
- // typeinfo objects at the end of the LSDA. However, unless we're in static
- // mode, this reference will require a relocation by the dynamic linker.
- //
- // Because of this, we have a couple of options:
- //
- // 1) If we are in -static mode, we can always use an absolute reference
- // from the LSDA, because the static linker will resolve it.
- //
- // 2) Otherwise, if the LSDA section is writable, we can output the direct
- // reference to the typeinfo and allow the dynamic linker to relocate
- // it. Since it is in a writable section, the dynamic linker won't
- // have a problem.
- //
- // 3) Finally, if we're in PIC mode and the LDSA section isn't writable,
- // we need to use some form of indirection. For example, on Darwin,
- // we can output a statically-relocatable reference to a dyld stub. The
- // offset to the stub is constant, but the contents are in a section
- // that is updated by the dynamic linker. This is easy enough, but we
- // need to tell the personality function of the unwinder to indirect
- // through the dyld stub.
- //
- // FIXME: When (3) is actually implemented, we'll have to emit the stubs
- // somewhere. This predicate should be moved to a shared location that is
- // in target-independent code.
- //
- TTypeEncoding = Asm->getObjFileLowering().getTTypeEncoding();
- }
-
- // Begin the exception table.
- // Sometimes we want not to emit the data into separate section (e.g. ARM
- // EHABI). In this case LSDASection will be NULL.
- if (LSDASection)
- Asm->OutStreamer->SwitchSection(LSDASection);
- Asm->EmitAlignment(2);
-
- // Emit the LSDA.
- MCSymbol *GCCETSym =
- Asm->OutContext.getOrCreateSymbol(Twine("GCC_except_table")+
- Twine(Asm->getFunctionNumber()));
- Asm->OutStreamer->EmitLabel(GCCETSym);
- Asm->OutStreamer->EmitLabel(Asm->getCurExceptionSym());
-
- // Emit the LSDA header.
- Asm->EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
- Asm->EmitEncodingByte(TTypeEncoding, "@TType");
-
- MCSymbol *TTBaseLabel = nullptr;
- if (HaveTTData) {
- // N.B.: There is a dependency loop between the size of the TTBase uleb128
- // here and the amount of padding before the aligned type table. The
- // assembler must sometimes pad this uleb128 or insert extra padding before
- // the type table. See PR35809 or GNU as bug 4029.
- MCSymbol *TTBaseRefLabel = Asm->createTempSymbol("ttbaseref");
- TTBaseLabel = Asm->createTempSymbol("ttbase");
- Asm->EmitLabelDifferenceAsULEB128(TTBaseLabel, TTBaseRefLabel);
- Asm->OutStreamer->EmitLabel(TTBaseRefLabel);
- }
-
- bool VerboseAsm = Asm->OutStreamer->isVerboseAsm();
-
- // Emit the landing pad call site table.
- MCSymbol *CstBeginLabel = Asm->createTempSymbol("cst_begin");
- MCSymbol *CstEndLabel = Asm->createTempSymbol("cst_end");
- Asm->EmitEncodingByte(CallSiteEncoding, "Call site");
- Asm->EmitLabelDifferenceAsULEB128(CstEndLabel, CstBeginLabel);
- Asm->OutStreamer->EmitLabel(CstBeginLabel);
-
- // SjLj / Wasm Exception handling
- if (IsSJLJ || IsWasm) {
- unsigned idx = 0;
- for (SmallVectorImpl<CallSiteEntry>::const_iterator
- I = CallSites.begin(), E = CallSites.end(); I != E; ++I, ++idx) {
- const CallSiteEntry &S = *I;
-
- // Index of the call site entry.
- if (VerboseAsm) {
- Asm->OutStreamer->AddComment(">> Call Site " + Twine(idx) + " <<");
- Asm->OutStreamer->AddComment(" On exception at call site "+Twine(idx));
- }
- Asm->EmitULEB128(idx);
-
- // Offset of the first associated action record, relative to the start of
- // the action table. This value is biased by 1 (1 indicates the start of
- // the action table), and 0 indicates that there are no actions.
- if (VerboseAsm) {
- if (S.Action == 0)
- Asm->OutStreamer->AddComment(" Action: cleanup");
- else
- Asm->OutStreamer->AddComment(" Action: " +
- Twine((S.Action - 1) / 2 + 1));
- }
- Asm->EmitULEB128(S.Action);
- }
- } else {
- // Itanium LSDA exception handling
-
- // The call-site table is a list of all call sites that may throw an
- // exception (including C++ 'throw' statements) in the procedure
- // fragment. It immediately follows the LSDA header. Each entry indicates,
- // for a given call, the first corresponding action record and corresponding
- // landing pad.
- //
- // The table begins with the number of bytes, stored as an LEB128
- // compressed, unsigned integer. The records immediately follow the record
- // count. They are sorted in increasing call-site address. Each record
- // indicates:
- //
- // * The position of the call-site.
- // * The position of the landing pad.
- // * The first action record for that call site.
- //
- // A missing entry in the call-site table indicates that a call is not
- // supposed to throw.
-
- unsigned Entry = 0;
- for (SmallVectorImpl<CallSiteEntry>::const_iterator
- I = CallSites.begin(), E = CallSites.end(); I != E; ++I) {
- const CallSiteEntry &S = *I;
-
- MCSymbol *EHFuncBeginSym = Asm->getFunctionBegin();
-
- MCSymbol *BeginLabel = S.BeginLabel;
- if (!BeginLabel)
- BeginLabel = EHFuncBeginSym;
- MCSymbol *EndLabel = S.EndLabel;
- if (!EndLabel)
- EndLabel = Asm->getFunctionEnd();
-
- // Offset of the call site relative to the start of the procedure.
- if (VerboseAsm)
- Asm->OutStreamer->AddComment(">> Call Site " + Twine(++Entry) + " <<");
- Asm->EmitLabelDifferenceAsULEB128(BeginLabel, EHFuncBeginSym);
- if (VerboseAsm)
- Asm->OutStreamer->AddComment(Twine(" Call between ") +
- BeginLabel->getName() + " and " +
- EndLabel->getName());
- Asm->EmitLabelDifferenceAsULEB128(EndLabel, BeginLabel);
-
- // Offset of the landing pad relative to the start of the procedure.
- if (!S.LPad) {
- if (VerboseAsm)
- Asm->OutStreamer->AddComment(" has no landing pad");
- Asm->EmitULEB128(0);
- } else {
- if (VerboseAsm)
- Asm->OutStreamer->AddComment(Twine(" jumps to ") +
- S.LPad->LandingPadLabel->getName());
- Asm->EmitLabelDifferenceAsULEB128(S.LPad->LandingPadLabel,
- EHFuncBeginSym);
- }
-
- // Offset of the first associated action record, relative to the start of
- // the action table. This value is biased by 1 (1 indicates the start of
- // the action table), and 0 indicates that there are no actions.
- if (VerboseAsm) {
- if (S.Action == 0)
- Asm->OutStreamer->AddComment(" On action: cleanup");
- else
- Asm->OutStreamer->AddComment(" On action: " +
- Twine((S.Action - 1) / 2 + 1));
- }
- Asm->EmitULEB128(S.Action);
- }
- }
- Asm->OutStreamer->EmitLabel(CstEndLabel);
-
- // Emit the Action Table.
- int Entry = 0;
- for (SmallVectorImpl<ActionEntry>::const_iterator
- I = Actions.begin(), E = Actions.end(); I != E; ++I) {
- const ActionEntry &Action = *I;
-
- if (VerboseAsm) {
- // Emit comments that decode the action table.
- Asm->OutStreamer->AddComment(">> Action Record " + Twine(++Entry) + " <<");
- }
-
- // Type Filter
- //
- // Used by the runtime to match the type of the thrown exception to the
- // type of the catch clauses or the types in the exception specification.
- if (VerboseAsm) {
- if (Action.ValueForTypeID > 0)
- Asm->OutStreamer->AddComment(" Catch TypeInfo " +
- Twine(Action.ValueForTypeID));
- else if (Action.ValueForTypeID < 0)
- Asm->OutStreamer->AddComment(" Filter TypeInfo " +
- Twine(Action.ValueForTypeID));
- else
- Asm->OutStreamer->AddComment(" Cleanup");
- }
- Asm->EmitSLEB128(Action.ValueForTypeID);
-
- // Action Record
- //
- // Self-relative signed displacement in bytes of the next action record,
- // or 0 if there is no next action record.
- if (VerboseAsm) {
- if (Action.NextAction == 0) {
- Asm->OutStreamer->AddComment(" No further actions");
- } else {
- unsigned NextAction = Entry + (Action.NextAction + 1) / 2;
- Asm->OutStreamer->AddComment(" Continue to action "+Twine(NextAction));
- }
- }
- Asm->EmitSLEB128(Action.NextAction);
- }
-
- if (HaveTTData) {
- Asm->EmitAlignment(2);
- emitTypeInfos(TTypeEncoding, TTBaseLabel);
- }
-
- Asm->EmitAlignment(2);
- return GCCETSym;
-}
-
-void EHStreamer::emitTypeInfos(unsigned TTypeEncoding, MCSymbol *TTBaseLabel) {
- const MachineFunction *MF = Asm->MF;
- const std::vector<const GlobalValue *> &TypeInfos = MF->getTypeInfos();
- const std::vector<unsigned> &FilterIds = MF->getFilterIds();
-
- bool VerboseAsm = Asm->OutStreamer->isVerboseAsm();
-
- int Entry = 0;
- // Emit the Catch TypeInfos.
- if (VerboseAsm && !TypeInfos.empty()) {
- Asm->OutStreamer->AddComment(">> Catch TypeInfos <<");
- Asm->OutStreamer->AddBlankLine();
- Entry = TypeInfos.size();
- }
-
- for (const GlobalValue *GV : make_range(TypeInfos.rbegin(),
- TypeInfos.rend())) {
- if (VerboseAsm)
- Asm->OutStreamer->AddComment("TypeInfo " + Twine(Entry--));
- Asm->EmitTTypeReference(GV, TTypeEncoding);
- }
-
- Asm->OutStreamer->EmitLabel(TTBaseLabel);
-
- // Emit the Exception Specifications.
- if (VerboseAsm && !FilterIds.empty()) {
- Asm->OutStreamer->AddComment(">> Filter TypeInfos <<");
- Asm->OutStreamer->AddBlankLine();
- Entry = 0;
- }
- for (std::vector<unsigned>::const_iterator
- I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
- unsigned TypeID = *I;
- if (VerboseAsm) {
- --Entry;
- if (isFilterEHSelector(TypeID))
- Asm->OutStreamer->AddComment("FilterInfo " + Twine(Entry));
- }
-
- Asm->EmitULEB128(TypeID);
- }
-}