llvm-project/llvm/lib/MC/MCStreamer.cpp

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//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCWin64EH.h"
#include "llvm/MC/MCWinEH.h"
#include "llvm/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
#include <cstdlib>
#include <utility>
using namespace llvm;
MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
S.setTargetStreamer(this);
}
// Pin the vtables to this file.
MCTargetStreamer::~MCTargetStreamer() = default;
void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
void MCTargetStreamer::finish() {}
void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
MCStreamer::MCStreamer(MCContext &Ctx)
: Context(Ctx), CurrentWinFrameInfo(nullptr) {
SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
}
MCStreamer::~MCStreamer() {
for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
delete WinFrameInfos[i];
}
void MCStreamer::reset() {
DwarfFrameInfos.clear();
for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
delete WinFrameInfos[i];
WinFrameInfos.clear();
CurrentWinFrameInfo = nullptr;
SymbolOrdering.clear();
SectionStack.clear();
SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
}
raw_ostream &MCStreamer::GetCommentOS() {
// By default, discard comments.
return nulls();
}
void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
void MCStreamer::addExplicitComment(const Twine &T) {}
void MCStreamer::emitExplicitComments() {}
void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
for (auto &FI : DwarfFrameInfos)
FI.CompactUnwindEncoding =
(MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
}
/// EmitIntValue - Special case of EmitValue that avoids the client having to
/// pass in a MCExpr for constant integers.
void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
assert(1 <= Size && Size <= 8 && "Invalid size");
assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
"Invalid size");
char buf[8];
const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
for (unsigned i = 0; i != Size; ++i) {
unsigned index = isLittleEndian ? i : (Size - i - 1);
buf[i] = uint8_t(Value >> (index * 8));
}
EmitBytes(StringRef(buf, Size));
}
/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
SmallString<128> Tmp;
raw_svector_ostream OSE(Tmp);
encodeULEB128(Value, OSE, Padding);
EmitBytes(OSE.str());
}
/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
SmallString<128> Tmp;
raw_svector_ostream OSE(Tmp);
encodeSLEB128(Value, OSE);
EmitBytes(OSE.str());
}
void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc) {
EmitValueImpl(Value, Size, Loc);
}
void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
bool IsSectionRelative) {
assert((!IsSectionRelative || Size == 4) &&
"SectionRelative value requires 4-bytes");
if (!IsSectionRelative)
EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
else
EmitCOFFSecRel32(Sym, /*Offset=*/0);
}
void MCStreamer::EmitDTPRel64Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::EmitDTPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::EmitTPRel64Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::EmitTPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
/// Emit NumBytes bytes worth of the value specified by FillValue.
/// This implements directives such as '.space'.
void MCStreamer::emitFill(uint64_t NumBytes, uint8_t FillValue) {
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
EmitIntValue(FillValue, 1);
}
void MCStreamer::emitFill(uint64_t NumValues, int64_t Size, int64_t Expr) {
int64_t NonZeroSize = Size > 4 ? 4 : Size;
Expr &= ~0ULL >> (64 - NonZeroSize * 8);
for (uint64_t i = 0, e = NumValues; i != e; ++i) {
EmitIntValue(Expr, NonZeroSize);
if (NonZeroSize < Size)
EmitIntValue(0, Size - NonZeroSize);
}
}
/// The implementation in this class just redirects to emitFill.
void MCStreamer::EmitZeros(uint64_t NumBytes) {
emitFill(NumBytes, 0);
}
unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
StringRef Directory,
StringRef Filename, unsigned CUID) {
return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
}
void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa,
unsigned Discriminator,
StringRef FileName) {
getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
Discriminator);
}
MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
if (!Table.getLabel()) {
StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
Table.setLabel(
Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
}
return Table.getLabel();
}
MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
if (DwarfFrameInfos.empty())
return nullptr;
return &DwarfFrameInfos.back();
}
bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
return CurFrame && !CurFrame->End;
}
void MCStreamer::EnsureValidDwarfFrame() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame || CurFrame->End)
report_fatal_error("No open frame");
}
bool MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename) {
return getContext().getCVContext().addFile(FileNo, Filename);
}
[codeview] Add new directives to record inlined call site line info Summary: Previously we were trying to represent this with the "contains" list of the .cv_inline_linetable directive, which was not enough information. Now we directly represent the chain of inlined call sites, so we know what location to emit when we encounter a .cv_loc directive of an inner inlined call site while emitting the line table of an outer function or inlined call site. Fixes PR29146. Also fixes PR29147, where we would crash when .cv_loc directives crossed sections. Now we write down the section of the first .cv_loc directive, and emit an error if any other .cv_loc directive for that function is in a different section. Also fixes issues with discontiguous inlined source locations, like in this example: volatile int unlikely_cond = 0; extern void __declspec(noreturn) abort(); __forceinline void f() { if (!unlikely_cond) abort(); } int main() { unlikely_cond = 0; f(); unlikely_cond = 0; } Previously our tables gave bad location information for the 'abort' call, and the debugger wouldn't snow the inlined stack frame for 'f'. It is important to emit good line tables for this code pattern, because it comes up whenever an asan bug occurs in an inlined function. The __asan_report* stubs are generally placed after the normal function epilogue, leading to discontiguous regions of inlined code. Reviewers: majnemer, amccarth Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D24014 llvm-svn: 280822
2016-09-08 00:15:31 +08:00
bool MCStreamer::EmitCVFuncIdDirective(unsigned FunctionId) {
return getContext().getCVContext().recordFunctionId(FunctionId);
}
bool MCStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
unsigned IAFunc, unsigned IAFile,
unsigned IALine, unsigned IACol,
SMLoc Loc) {
if (getContext().getCVContext().getCVFunctionInfo(IAFunc) == nullptr) {
getContext().reportError(Loc, "parent function id not introduced by "
".cv_func_id or .cv_inline_site_id");
return true;
}
return getContext().getCVContext().recordInlinedCallSiteId(
FunctionId, IAFunc, IAFile, IALine, IACol);
}
void MCStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
unsigned Line, unsigned Column,
bool PrologueEnd, bool IsStmt,
[codeview] Add new directives to record inlined call site line info Summary: Previously we were trying to represent this with the "contains" list of the .cv_inline_linetable directive, which was not enough information. Now we directly represent the chain of inlined call sites, so we know what location to emit when we encounter a .cv_loc directive of an inner inlined call site while emitting the line table of an outer function or inlined call site. Fixes PR29146. Also fixes PR29147, where we would crash when .cv_loc directives crossed sections. Now we write down the section of the first .cv_loc directive, and emit an error if any other .cv_loc directive for that function is in a different section. Also fixes issues with discontiguous inlined source locations, like in this example: volatile int unlikely_cond = 0; extern void __declspec(noreturn) abort(); __forceinline void f() { if (!unlikely_cond) abort(); } int main() { unlikely_cond = 0; f(); unlikely_cond = 0; } Previously our tables gave bad location information for the 'abort' call, and the debugger wouldn't snow the inlined stack frame for 'f'. It is important to emit good line tables for this code pattern, because it comes up whenever an asan bug occurs in an inlined function. The __asan_report* stubs are generally placed after the normal function epilogue, leading to discontiguous regions of inlined code. Reviewers: majnemer, amccarth Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D24014 llvm-svn: 280822
2016-09-08 00:15:31 +08:00
StringRef FileName, SMLoc Loc) {
CodeViewContext &CVC = getContext().getCVContext();
MCCVFunctionInfo *FI = CVC.getCVFunctionInfo(FunctionId);
if (!FI)
return getContext().reportError(
Loc, "function id not introduced by .cv_func_id or .cv_inline_site_id");
// Track the section
if (FI->Section == nullptr)
FI->Section = getCurrentSectionOnly();
else if (FI->Section != getCurrentSectionOnly())
return getContext().reportError(
Loc,
"all .cv_loc directives for a function must be in the same section");
CVC.setCurrentCVLoc(FunctionId, FileNo, Line, Column, PrologueEnd, IsStmt);
}
void MCStreamer::EmitCVLinetableDirective(unsigned FunctionId,
const MCSymbol *Begin,
const MCSymbol *End) {}
[codeview] Add new directives to record inlined call site line info Summary: Previously we were trying to represent this with the "contains" list of the .cv_inline_linetable directive, which was not enough information. Now we directly represent the chain of inlined call sites, so we know what location to emit when we encounter a .cv_loc directive of an inner inlined call site while emitting the line table of an outer function or inlined call site. Fixes PR29146. Also fixes PR29147, where we would crash when .cv_loc directives crossed sections. Now we write down the section of the first .cv_loc directive, and emit an error if any other .cv_loc directive for that function is in a different section. Also fixes issues with discontiguous inlined source locations, like in this example: volatile int unlikely_cond = 0; extern void __declspec(noreturn) abort(); __forceinline void f() { if (!unlikely_cond) abort(); } int main() { unlikely_cond = 0; f(); unlikely_cond = 0; } Previously our tables gave bad location information for the 'abort' call, and the debugger wouldn't snow the inlined stack frame for 'f'. It is important to emit good line tables for this code pattern, because it comes up whenever an asan bug occurs in an inlined function. The __asan_report* stubs are generally placed after the normal function epilogue, leading to discontiguous regions of inlined code. Reviewers: majnemer, amccarth Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D24014 llvm-svn: 280822
2016-09-08 00:15:31 +08:00
void MCStreamer::EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
unsigned SourceFileId,
unsigned SourceLineNum,
const MCSymbol *FnStartSym,
const MCSymbol *FnEndSym) {}
void MCStreamer::EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
StringRef FixedSizePortion) {}
void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
MCSymbol *EHSymbol) {
}
void MCStreamer::InitSections(bool NoExecStack) {
SwitchSection(getContext().getObjectFileInfo()->getTextSection());
}
void MCStreamer::AssignFragment(MCSymbol *Symbol, MCFragment *Fragment) {
assert(Fragment);
Symbol->setFragment(Fragment);
// As we emit symbols into a section, track the order so that they can
// be sorted upon later. Zero is reserved to mean 'unemitted'.
SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
}
void MCStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc) {
Symbol->redefineIfPossible();
if (!Symbol->isUndefined() || Symbol->isVariable())
return getContext().reportError(Loc, "invalid symbol redefinition");
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSectionOnly() && "Cannot emit before setting section!");
assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());
MCTargetStreamer *TS = getTargetStreamer();
if (TS)
TS->emitLabel(Symbol);
}
void MCStreamer::EmitCFISections(bool EH, bool Debug) {
assert(EH || Debug);
}
void MCStreamer::EmitCFIStartProc(bool IsSimple) {
if (hasUnfinishedDwarfFrameInfo())
report_fatal_error("Starting a frame before finishing the previous one!");
MCDwarfFrameInfo Frame;
Frame.IsSimple = IsSimple;
EmitCFIStartProcImpl(Frame);
const MCAsmInfo* MAI = Context.getAsmInfo();
if (MAI) {
for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
Frame.CurrentCfaRegister = Inst.getRegister();
}
}
}
DwarfFrameInfos.push_back(Frame);
}
void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
}
void MCStreamer::EmitCFIEndProc() {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
EmitCFIEndProcImpl(*CurFrame);
}
void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
// Put a dummy non-null value in Frame.End to mark that this frame has been
// closed.
Frame.End = (MCSymbol *) 1;
}
MCSymbol *MCStreamer::EmitCFILabel() {
MCSymbol *Label = getContext().createTempSymbol("cfi", true);
EmitLabel(Label);
return Label;
}
MCSymbol *MCStreamer::EmitCFICommon() {
EnsureValidDwarfFrame();
return EmitCFILabel();
}
void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfa(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
}
void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfaOffset(Label, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfaRegister(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
}
void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createOffset(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createRelOffset(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
unsigned Encoding) {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Personality = Sym;
CurFrame->PersonalityEncoding = Encoding;
}
void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Lsda = Sym;
CurFrame->LsdaEncoding = Encoding;
}
void MCStreamer::EmitCFIRememberState() {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRestoreState() {
// FIXME: Error if there is no matching cfi_remember_state.
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFISameValue(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createSameValue(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRestore(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createRestore(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIEscape(StringRef Values) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createGnuArgsSize(Label, Size);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFISignalFrame() {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->IsSignalFrame = true;
}
void MCStreamer::EmitCFIUndefined(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createUndefined(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createRegister(Label, Register1, Register2);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIWindowSave() {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createWindowSave(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EnsureValidWinFrameInfo() {
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->usesWindowsCFI())
report_fatal_error(".seh_* directives are not supported on this target");
if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
report_fatal_error("No open Win64 EH frame function!");
}
void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->usesWindowsCFI())
report_fatal_error(".seh_* directives are not supported on this target");
if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
report_fatal_error("Starting a function before ending the previous one!");
MCSymbol *StartProc = EmitCFILabel();
WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
CurrentWinFrameInfo = WinFrameInfos.back();
CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
}
void MCStreamer::EmitWinCFIEndProc() {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->ChainedParent)
report_fatal_error("Not all chained regions terminated!");
MCSymbol *Label = EmitCFILabel();
CurrentWinFrameInfo->End = Label;
}
void MCStreamer::EmitWinCFIStartChained() {
EnsureValidWinFrameInfo();
MCSymbol *StartProc = EmitCFILabel();
WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
StartProc, CurrentWinFrameInfo));
CurrentWinFrameInfo = WinFrameInfos.back();
CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
}
void MCStreamer::EmitWinCFIEndChained() {
EnsureValidWinFrameInfo();
if (!CurrentWinFrameInfo->ChainedParent)
report_fatal_error("End of a chained region outside a chained region!");
MCSymbol *Label = EmitCFILabel();
CurrentWinFrameInfo->End = Label;
CurrentWinFrameInfo =
const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
}
void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
bool Except) {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->ChainedParent)
report_fatal_error("Chained unwind areas can't have handlers!");
CurrentWinFrameInfo->ExceptionHandler = Sym;
if (!Except && !Unwind)
report_fatal_error("Don't know what kind of handler this is!");
if (Unwind)
CurrentWinFrameInfo->HandlesUnwind = true;
if (Except)
CurrentWinFrameInfo->HandlesExceptions = true;
}
void MCStreamer::EmitWinEHHandlerData() {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->ChainedParent)
report_fatal_error("Chained unwind areas can't have handlers!");
}
static MCSection *getWinCFISection(MCContext &Context, unsigned *NextWinCFIID,
MCSection *MainCFISec,
const MCSection *TextSec) {
// If this is the main .text section, use the main unwind info section.
if (TextSec == Context.getObjectFileInfo()->getTextSection())
return MainCFISec;
const auto *TextSecCOFF = cast<MCSectionCOFF>(TextSec);
unsigned UniqueID = TextSecCOFF->getOrAssignWinCFISectionID(NextWinCFIID);
// If this section is COMDAT, this unwind section should be COMDAT associative
// with its group.
const MCSymbol *KeySym = nullptr;
if (TextSecCOFF->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT)
KeySym = TextSecCOFF->getCOMDATSymbol();
return Context.getAssociativeCOFFSection(cast<MCSectionCOFF>(MainCFISec),
KeySym, UniqueID);
}
MCSection *MCStreamer::getAssociatedPDataSection(const MCSection *TextSec) {
return getWinCFISection(getContext(), &NextWinCFIID,
getContext().getObjectFileInfo()->getPDataSection(),
TextSec);
}
MCSection *MCStreamer::getAssociatedXDataSection(const MCSection *TextSec) {
return getWinCFISection(getContext(), &NextWinCFIID,
getContext().getObjectFileInfo()->getXDataSection(),
TextSec);
}
void MCStreamer::EmitSyntaxDirective() {}
void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
EnsureValidWinFrameInfo();
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->LastFrameInst >= 0)
report_fatal_error("Frame register and offset already specified!");
if (Offset & 0x0F)
report_fatal_error("Misaligned frame pointer offset!");
if (Offset > 240)
report_fatal_error("Frame offset must be less than or equal to 240!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst =
Win64EH::Instruction::SetFPReg(Label, Register, Offset);
CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
EnsureValidWinFrameInfo();
if (Size == 0)
report_fatal_error("Allocation size must be non-zero!");
if (Size & 7)
report_fatal_error("Misaligned stack allocation!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
EnsureValidWinFrameInfo();
if (Offset & 7)
report_fatal_error("Misaligned saved register offset!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst =
Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
EnsureValidWinFrameInfo();
if (Offset & 0x0F)
report_fatal_error("Misaligned saved vector register offset!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst =
Win64EH::Instruction::SaveXMM(Label, Register, Offset);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIPushFrame(bool Code) {
EnsureValidWinFrameInfo();
if (!CurrentWinFrameInfo->Instructions.empty())
report_fatal_error("If present, PushMachFrame must be the first UOP");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIEndProlog() {
EnsureValidWinFrameInfo();
MCSymbol *Label = EmitCFILabel();
CurrentWinFrameInfo->PrologEnd = Label;
}
void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
}
void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
}
void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {}
/// EmitRawText - If this file is backed by an assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
void MCStreamer::EmitRawTextImpl(StringRef String) {
errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
" something must not be fully mc'ized\n";
abort();
}
void MCStreamer::EmitRawText(const Twine &T) {
SmallString<128> Str;
EmitRawTextImpl(T.toStringRef(Str));
}
void MCStreamer::EmitWindowsUnwindTables() {
}
void MCStreamer::Finish() {
if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
report_fatal_error("Unfinished frame!");
MCTargetStreamer *TS = getTargetStreamer();
if (TS)
TS->finish();
FinishImpl();
}
void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
visitUsedExpr(*Value);
Symbol->setVariableValue(Value);
MCTargetStreamer *TS = getTargetStreamer();
if (TS)
TS->emitAssignment(Symbol, Value);
}
void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
const MCInst &Inst, const MCSubtargetInfo &STI) {
InstPrinter.printInst(&Inst, OS, "", STI);
}
void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
}
void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
switch (Expr.getKind()) {
case MCExpr::Target:
cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
break;
case MCExpr::Constant:
break;
case MCExpr::Binary: {
const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
visitUsedExpr(*BE.getLHS());
visitUsedExpr(*BE.getRHS());
break;
}
case MCExpr::SymbolRef:
visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
break;
case MCExpr::Unary:
visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
break;
}
}
void MCStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
bool) {
// Scan for values.
for (unsigned i = Inst.getNumOperands(); i--;)
if (Inst.getOperand(i).isExpr())
visitUsedExpr(*Inst.getOperand(i).getExpr());
}
void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
unsigned Size) {
// Get the Hi-Lo expression.
const MCExpr *Diff =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
MCSymbolRefExpr::create(Lo, Context), Context);
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->doesSetDirectiveSuppressReloc()) {
EmitValue(Diff, Size);
return;
}
// Otherwise, emit with .set (aka assignment).
MCSymbol *SetLabel = Context.createTempSymbol("set", true);
EmitAssignment(SetLabel, Diff);
EmitSymbolValue(SetLabel, Size);
}
void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::EndCOFFSymbolDef() {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::EmitFileDirective(StringRef Filename) {}
void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::EmitCOFFSymbolType(int Type) {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
void MCStreamer::emitELFSymverDirective(MCSymbol *Alias,
const MCSymbol *Aliasee) {}
void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {}
void MCStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment) {}
void MCStreamer::ChangeSection(MCSection *, const MCExpr *) {}
void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
void MCStreamer::EmitBytes(StringRef Data) {}
void MCStreamer::EmitBinaryData(StringRef Data) { EmitBytes(Data); }
void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) {
visitUsedExpr(*Value);
}
void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
void MCStreamer::emitFill(const MCExpr &NumBytes, uint64_t Value, SMLoc Loc) {}
void MCStreamer::emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
SMLoc Loc) {}
void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) {}
void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {}
void MCStreamer::emitValueToOffset(const MCExpr *Offset, unsigned char Value,
SMLoc Loc) {}
void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
void MCStreamer::FinishImpl() {}
void MCStreamer::EmitBundleUnlock() {}
void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
assert(Section && "Cannot switch to a null section!");
MCSectionSubPair curSection = SectionStack.back().first;
SectionStack.back().second = curSection;
if (MCSectionSubPair(Section, Subsection) != curSection) {
ChangeSection(Section, Subsection);
SectionStack.back().first = MCSectionSubPair(Section, Subsection);
assert(!Section->hasEnded() && "Section already ended");
MCSymbol *Sym = Section->getBeginSymbol();
if (Sym && !Sym->isInSection())
EmitLabel(Sym);
}
}
MCSymbol *MCStreamer::endSection(MCSection *Section) {
// TODO: keep track of the last subsection so that this symbol appears in the
// correct place.
MCSymbol *Sym = Section->getEndSymbol(Context);
if (Sym->isInSection())
return Sym;
SwitchSection(Section);
EmitLabel(Sym);
return Sym;
}