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llvm-mirror/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp
Yuanfang Chen afa87767f4 [Diagnose] Unify MCContext and LLVMContext diagnosing 
The situation with inline asm/MC error reporting is kind of messy at the
moment. The errors from MC layout are not reliably propagated and users
have to specify an inlineasm handler separately to get inlineasm
diagnose. The latter issue is not a correctness issue but could be improved.

* Kill LLVMContext inlineasm diagnose handler and migrate it to use
  DiagnoseInfo/DiagnoseHandler.
* Introduce `DiagnoseInfoSrcMgr` to diagnose SourceMgr backed errors. This
  covers use cases like inlineasm, MC, and any clients using SourceMgr.
* Move AsmPrinter::SrcMgrDiagInfo and its instance to MCContext. The next step
  is to combine MCContext::SrcMgr and MCContext::InlineSrcMgr because in all
  use cases, only one of them is used.
* If LLVMContext is available, let MCContext uses LLVMContext's diagnose
  handler; if LLVMContext is not available, MCContext uses its own default
  diagnose handler which just prints SMDiagnostic.
* Change a few clients(Clang, llc, lldb) to use the new way of reporting.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D97449
2021-03-01 15:58:37 -08:00

652 lines
24 KiB
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//===-- AsmPrinterInlineAsm.cpp - AsmPrinter Inline Asm Handling ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the inline assembler pieces of the AsmPrinter class.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
unsigned AsmPrinter::addInlineAsmDiagBuffer(StringRef AsmStr,
const MDNode *LocMDNode) const {
MCContext &Context = MMI->getContext();
Context.initInlineSourceManager();
SourceMgr &SrcMgr = *Context.getInlineSourceManager();
std::vector<const MDNode *> &LocInfos = Context.getLocInfos();
std::unique_ptr<MemoryBuffer> Buffer;
// The inline asm source manager will outlive AsmStr, so make a copy of the
// string for SourceMgr to own.
Buffer = MemoryBuffer::getMemBufferCopy(AsmStr, "<inline asm>");
// Tell SrcMgr about this buffer, it takes ownership of the buffer.
unsigned BufNum = SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
// Store LocMDNode in DiagInfo, using BufNum as an identifier.
if (LocMDNode) {
LocInfos.resize(BufNum);
LocInfos[BufNum - 1] = LocMDNode;
}
return BufNum;
}
/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
void AsmPrinter::emitInlineAsm(StringRef Str, const MCSubtargetInfo &STI,
const MCTargetOptions &MCOptions,
const MDNode *LocMDNode,
InlineAsm::AsmDialect Dialect) const {
assert(!Str.empty() && "Can't emit empty inline asm block");
// Remember if the buffer is nul terminated or not so we can avoid a copy.
bool isNullTerminated = Str.back() == 0;
if (isNullTerminated)
Str = Str.substr(0, Str.size()-1);
// If the output streamer does not have mature MC support or the integrated
// assembler has been disabled, just emit the blob textually.
// Otherwise parse the asm and emit it via MC support.
// This is useful in case the asm parser doesn't handle something but the
// system assembler does.
const MCAsmInfo *MCAI = TM.getMCAsmInfo();
assert(MCAI && "No MCAsmInfo");
if (!MCAI->useIntegratedAssembler() &&
!OutStreamer->isIntegratedAssemblerRequired()) {
emitInlineAsmStart();
OutStreamer->emitRawText(Str);
emitInlineAsmEnd(STI, nullptr);
return;
}
unsigned BufNum = addInlineAsmDiagBuffer(Str, LocMDNode);
SourceMgr &SrcMgr = *MMI->getContext().getInlineSourceManager();
SrcMgr.setIncludeDirs(MCOptions.IASSearchPaths);
std::unique_ptr<MCAsmParser> Parser(
createMCAsmParser(SrcMgr, OutContext, *OutStreamer, *MAI, BufNum));
// Do not use assembler-level information for parsing inline assembly.
OutStreamer->setUseAssemblerInfoForParsing(false);
// We create a new MCInstrInfo here since we might be at the module level
// and not have a MachineFunction to initialize the TargetInstrInfo from and
// we only need MCInstrInfo for asm parsing. We create one unconditionally
// because it's not subtarget dependent.
std::unique_ptr<MCInstrInfo> MII(TM.getTarget().createMCInstrInfo());
assert(MII && "Failed to create instruction info");
std::unique_ptr<MCTargetAsmParser> TAP(TM.getTarget().createMCAsmParser(
STI, *Parser, *MII, MCOptions));
if (!TAP)
report_fatal_error("Inline asm not supported by this streamer because"
" we don't have an asm parser for this target\n");
Parser->setAssemblerDialect(Dialect);
Parser->setTargetParser(*TAP.get());
// Enable lexing Masm binary and hex integer literals in intel inline
// assembly.
if (Dialect == InlineAsm::AD_Intel)
Parser->getLexer().setLexMasmIntegers(true);
emitInlineAsmStart();
// Don't implicitly switch to the text section before the asm.
(void)Parser->Run(/*NoInitialTextSection*/ true,
/*NoFinalize*/ true);
emitInlineAsmEnd(STI, &TAP->getSTI());
}
static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
MachineModuleInfo *MMI, AsmPrinter *AP,
unsigned LocCookie, raw_ostream &OS) {
// Switch to the inline assembly variant.
OS << "\t.intel_syntax\n\t";
const char *LastEmitted = AsmStr; // One past the last character emitted.
unsigned NumOperands = MI->getNumOperands();
while (*LastEmitted) {
switch (*LastEmitted) {
default: {
// Not a special case, emit the string section literally.
const char *LiteralEnd = LastEmitted+1;
while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
++LiteralEnd;
OS.write(LastEmitted, LiteralEnd-LastEmitted);
LastEmitted = LiteralEnd;
break;
}
case '\n':
++LastEmitted; // Consume newline character.
OS << '\n'; // Indent code with newline.
break;
case '$': {
++LastEmitted; // Consume '$' character.
bool Done = true;
// Handle escapes.
switch (*LastEmitted) {
default: Done = false; break;
case '$':
++LastEmitted; // Consume second '$' character.
break;
}
if (Done) break;
bool HasCurlyBraces = false;
if (*LastEmitted == '{') { // ${variable}
++LastEmitted; // Consume '{' character.
HasCurlyBraces = true;
}
// If we have ${:foo}, then this is not a real operand reference, it is a
// "magic" string reference, just like in .td files. Arrange to call
// PrintSpecial.
if (HasCurlyBraces && LastEmitted[0] == ':') {
++LastEmitted;
const char *StrStart = LastEmitted;
const char *StrEnd = strchr(StrStart, '}');
if (!StrEnd)
report_fatal_error("Unterminated ${:foo} operand in inline asm"
" string: '" + Twine(AsmStr) + "'");
std::string Val(StrStart, StrEnd);
AP->PrintSpecial(MI, OS, Val.c_str());
LastEmitted = StrEnd+1;
break;
}
const char *IDStart = LastEmitted;
const char *IDEnd = IDStart;
while (isDigit(*IDEnd))
++IDEnd;
unsigned Val;
if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
report_fatal_error("Bad $ operand number in inline asm string: '" +
Twine(AsmStr) + "'");
LastEmitted = IDEnd;
if (Val >= NumOperands-1)
report_fatal_error("Invalid $ operand number in inline asm string: '" +
Twine(AsmStr) + "'");
char Modifier[2] = { 0, 0 };
if (HasCurlyBraces) {
// If we have curly braces, check for a modifier character. This
// supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
if (*LastEmitted == ':') {
++LastEmitted; // Consume ':' character.
if (*LastEmitted == 0)
report_fatal_error("Bad ${:} expression in inline asm string: '" +
Twine(AsmStr) + "'");
Modifier[0] = *LastEmitted;
++LastEmitted; // Consume modifier character.
}
if (*LastEmitted != '}')
report_fatal_error("Bad ${} expression in inline asm string: '" +
Twine(AsmStr) + "'");
++LastEmitted; // Consume '}' character.
}
// Okay, we finally have a value number. Ask the target to print this
// operand!
unsigned OpNo = InlineAsm::MIOp_FirstOperand;
bool Error = false;
// Scan to find the machine operand number for the operand.
for (; Val; --Val) {
if (OpNo >= MI->getNumOperands()) break;
unsigned OpFlags = MI->getOperand(OpNo).getImm();
OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
}
// We may have a location metadata attached to the end of the
// instruction, and at no point should see metadata at any
// other point while processing. It's an error if so.
if (OpNo >= MI->getNumOperands() ||
MI->getOperand(OpNo).isMetadata()) {
Error = true;
} else {
unsigned OpFlags = MI->getOperand(OpNo).getImm();
++OpNo; // Skip over the ID number.
if (InlineAsm::isMemKind(OpFlags)) {
Error = AP->PrintAsmMemoryOperand(
MI, OpNo, Modifier[0] ? Modifier : nullptr, OS);
} else {
Error = AP->PrintAsmOperand(MI, OpNo,
Modifier[0] ? Modifier : nullptr, OS);
}
}
if (Error) {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "invalid operand in inline asm: '" << AsmStr << "'";
MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
}
break;
}
}
}
OS << "\n\t.att_syntax\n" << (char)0; // null terminate string.
}
static void EmitGCCInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
MachineModuleInfo *MMI, int AsmPrinterVariant,
AsmPrinter *AP, unsigned LocCookie,
raw_ostream &OS) {
int CurVariant = -1; // The number of the {.|.|.} region we are in.
const char *LastEmitted = AsmStr; // One past the last character emitted.
unsigned NumOperands = MI->getNumOperands();
OS << '\t';
while (*LastEmitted) {
switch (*LastEmitted) {
default: {
// Not a special case, emit the string section literally.
const char *LiteralEnd = LastEmitted+1;
while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
++LiteralEnd;
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
OS.write(LastEmitted, LiteralEnd-LastEmitted);
LastEmitted = LiteralEnd;
break;
}
case '\n':
++LastEmitted; // Consume newline character.
OS << '\n'; // Indent code with newline.
break;
case '$': {
++LastEmitted; // Consume '$' character.
bool Done = true;
// Handle escapes.
switch (*LastEmitted) {
default: Done = false; break;
case '$': // $$ -> $
if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
OS << '$';
++LastEmitted; // Consume second '$' character.
break;
case '(': // $( -> same as GCC's { character.
++LastEmitted; // Consume '(' character.
if (CurVariant != -1)
report_fatal_error("Nested variants found in inline asm string: '" +
Twine(AsmStr) + "'");
CurVariant = 0; // We're in the first variant now.
break;
case '|':
++LastEmitted; // consume '|' character.
if (CurVariant == -1)
OS << '|'; // this is gcc's behavior for | outside a variant
else
++CurVariant; // We're in the next variant.
break;
case ')': // $) -> same as GCC's } char.
++LastEmitted; // consume ')' character.
if (CurVariant == -1)
OS << '}'; // this is gcc's behavior for } outside a variant
else
CurVariant = -1;
break;
}
if (Done) break;
bool HasCurlyBraces = false;
if (*LastEmitted == '{') { // ${variable}
++LastEmitted; // Consume '{' character.
HasCurlyBraces = true;
}
// If we have ${:foo}, then this is not a real operand reference, it is a
// "magic" string reference, just like in .td files. Arrange to call
// PrintSpecial.
if (HasCurlyBraces && *LastEmitted == ':') {
++LastEmitted;
const char *StrStart = LastEmitted;
const char *StrEnd = strchr(StrStart, '}');
if (!StrEnd)
report_fatal_error("Unterminated ${:foo} operand in inline asm"
" string: '" + Twine(AsmStr) + "'");
std::string Val(StrStart, StrEnd);
AP->PrintSpecial(MI, OS, Val.c_str());
LastEmitted = StrEnd+1;
break;
}
const char *IDStart = LastEmitted;
const char *IDEnd = IDStart;
while (isDigit(*IDEnd))
++IDEnd;
unsigned Val;
if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
report_fatal_error("Bad $ operand number in inline asm string: '" +
Twine(AsmStr) + "'");
LastEmitted = IDEnd;
char Modifier[2] = { 0, 0 };
if (HasCurlyBraces) {
// If we have curly braces, check for a modifier character. This
// supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
if (*LastEmitted == ':') {
++LastEmitted; // Consume ':' character.
if (*LastEmitted == 0)
report_fatal_error("Bad ${:} expression in inline asm string: '" +
Twine(AsmStr) + "'");
Modifier[0] = *LastEmitted;
++LastEmitted; // Consume modifier character.
}
if (*LastEmitted != '}')
report_fatal_error("Bad ${} expression in inline asm string: '" +
Twine(AsmStr) + "'");
++LastEmitted; // Consume '}' character.
}
if (Val >= NumOperands-1)
report_fatal_error("Invalid $ operand number in inline asm string: '" +
Twine(AsmStr) + "'");
// Okay, we finally have a value number. Ask the target to print this
// operand!
if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
unsigned OpNo = InlineAsm::MIOp_FirstOperand;
bool Error = false;
// Scan to find the machine operand number for the operand.
for (; Val; --Val) {
if (OpNo >= MI->getNumOperands()) break;
unsigned OpFlags = MI->getOperand(OpNo).getImm();
OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
}
// We may have a location metadata attached to the end of the
// instruction, and at no point should see metadata at any
// other point while processing. It's an error if so.
if (OpNo >= MI->getNumOperands() ||
MI->getOperand(OpNo).isMetadata()) {
Error = true;
} else {
unsigned OpFlags = MI->getOperand(OpNo).getImm();
++OpNo; // Skip over the ID number.
// FIXME: Shouldn't arch-independent output template handling go into
// PrintAsmOperand?
// Labels are target independent.
if (MI->getOperand(OpNo).isBlockAddress()) {
const BlockAddress *BA = MI->getOperand(OpNo).getBlockAddress();
MCSymbol *Sym = AP->GetBlockAddressSymbol(BA);
Sym->print(OS, AP->MAI);
MMI->getContext().registerInlineAsmLabel(Sym);
} else if (MI->getOperand(OpNo).isMBB()) {
const MCSymbol *Sym = MI->getOperand(OpNo).getMBB()->getSymbol();
Sym->print(OS, AP->MAI);
} else if (Modifier[0] == 'l') {
Error = true;
} else if (InlineAsm::isMemKind(OpFlags)) {
Error = AP->PrintAsmMemoryOperand(
MI, OpNo, Modifier[0] ? Modifier : nullptr, OS);
} else {
Error = AP->PrintAsmOperand(MI, OpNo,
Modifier[0] ? Modifier : nullptr, OS);
}
}
if (Error) {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "invalid operand in inline asm: '" << AsmStr << "'";
MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
}
}
break;
}
}
}
OS << '\n' << (char)0; // null terminate string.
}
/// This method formats and emits the specified machine instruction that is an
/// inline asm.
void AsmPrinter::emitInlineAsm(const MachineInstr *MI) const {
assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
// Count the number of register definitions to find the asm string.
unsigned NumDefs = 0;
for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
++NumDefs)
assert(NumDefs != MI->getNumOperands()-2 && "No asm string?");
assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
// Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
// If this asmstr is empty, just print the #APP/#NOAPP markers.
// These are useful to see where empty asm's wound up.
if (AsmStr[0] == 0) {
OutStreamer->emitRawComment(MAI->getInlineAsmStart());
OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
return;
}
// Emit the #APP start marker. This has to happen even if verbose-asm isn't
// enabled, so we use emitRawComment.
OutStreamer->emitRawComment(MAI->getInlineAsmStart());
// Get the !srcloc metadata node if we have it, and decode the loc cookie from
// it.
unsigned LocCookie = 0;
const MDNode *LocMD = nullptr;
for (unsigned i = MI->getNumOperands(); i != 0; --i) {
if (MI->getOperand(i-1).isMetadata() &&
(LocMD = MI->getOperand(i-1).getMetadata()) &&
LocMD->getNumOperands() != 0) {
if (const ConstantInt *CI =
mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) {
LocCookie = CI->getZExtValue();
break;
}
}
}
// Emit the inline asm to a temporary string so we can emit it through
// EmitInlineAsm.
SmallString<256> StringData;
raw_svector_ostream OS(StringData);
// The variant of the current asmprinter.
int AsmPrinterVariant = MAI->getAssemblerDialect();
AsmPrinter *AP = const_cast<AsmPrinter*>(this);
if (MI->getInlineAsmDialect() == InlineAsm::AD_ATT)
EmitGCCInlineAsmStr(AsmStr, MI, MMI, AsmPrinterVariant, AP, LocCookie, OS);
else
EmitMSInlineAsmStr(AsmStr, MI, MMI, AP, LocCookie, OS);
// Emit warnings if we use reserved registers on the clobber list, as
// that might lead to undefined behaviour.
SmallVector<Register, 8> RestrRegs;
const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
// Start with the first operand descriptor, and iterate over them.
for (unsigned I = InlineAsm::MIOp_FirstOperand, NumOps = MI->getNumOperands();
I < NumOps; ++I) {
const MachineOperand &MO = MI->getOperand(I);
if (!MO.isImm())
continue;
unsigned Flags = MO.getImm();
if (InlineAsm::getKind(Flags) == InlineAsm::Kind_Clobber) {
Register Reg = MI->getOperand(I + 1).getReg();
if (!TRI->isAsmClobberable(*MF, Reg))
RestrRegs.push_back(Reg);
}
// Skip to one before the next operand descriptor, if it exists.
I += InlineAsm::getNumOperandRegisters(Flags);
}
if (!RestrRegs.empty()) {
unsigned BufNum = addInlineAsmDiagBuffer(OS.str(), LocMD);
auto &SrcMgr = *MMI->getContext().getInlineSourceManager();
SMLoc Loc = SMLoc::getFromPointer(
SrcMgr.getMemoryBuffer(BufNum)->getBuffer().begin());
std::string Msg = "inline asm clobber list contains reserved registers: ";
ListSeparator LS;
for (const Register &RR : RestrRegs) {
Msg += LS;
Msg += TRI->getName(RR);
}
const char *Note =
"Reserved registers on the clobber list may not be "
"preserved across the asm statement, and clobbering them may "
"lead to undefined behaviour.";
SrcMgr.PrintMessage(Loc, SourceMgr::DK_Warning, Msg);
SrcMgr.PrintMessage(Loc, SourceMgr::DK_Note, Note);
}
emitInlineAsm(OS.str(), getSubtargetInfo(), TM.Options.MCOptions, LocMD,
MI->getInlineAsmDialect());
// Emit the #NOAPP end marker. This has to happen even if verbose-asm isn't
// enabled, so we use emitRawComment.
OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
}
/// PrintSpecial - Print information related to the specified machine instr
/// that is independent of the operand, and may be independent of the instr
/// itself. This can be useful for portably encoding the comment character
/// or other bits of target-specific knowledge into the asmstrings. The
/// syntax used is ${:comment}. Targets can override this to add support
/// for their own strange codes.
void AsmPrinter::PrintSpecial(const MachineInstr *MI, raw_ostream &OS,
const char *Code) const {
if (!strcmp(Code, "private")) {
const DataLayout &DL = MF->getDataLayout();
OS << DL.getPrivateGlobalPrefix();
} else if (!strcmp(Code, "comment")) {
OS << MAI->getCommentString();
} else if (!strcmp(Code, "uid")) {
// Comparing the address of MI isn't sufficient, because machineinstrs may
// be allocated to the same address across functions.
// If this is a new LastFn instruction, bump the counter.
if (LastMI != MI || LastFn != getFunctionNumber()) {
++Counter;
LastMI = MI;
LastFn = getFunctionNumber();
}
OS << Counter;
} else {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Unknown special formatter '" << Code
<< "' for machine instr: " << *MI;
report_fatal_error(Msg.str());
}
}
void AsmPrinter::PrintSymbolOperand(const MachineOperand &MO, raw_ostream &OS) {
assert(MO.isGlobal() && "caller should check MO.isGlobal");
getSymbol(MO.getGlobal())->print(OS, MAI);
printOffset(MO.getOffset(), OS);
}
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
/// instruction, using the specified assembler variant. Targets should
/// override this to format as appropriate for machine specific ExtraCodes
/// or when the arch-independent handling would be too complex otherwise.
bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) {
// Does this asm operand have a single letter operand modifier?
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
// https://gcc.gnu.org/onlinedocs/gccint/Output-Template.html
const MachineOperand &MO = MI->getOperand(OpNo);
switch (ExtraCode[0]) {
default:
return true; // Unknown modifier.
case 'a': // Print as memory address.
if (MO.isReg()) {
PrintAsmMemoryOperand(MI, OpNo, nullptr, O);
return false;
}
LLVM_FALLTHROUGH; // GCC allows '%a' to behave like '%c' with immediates.
case 'c': // Substitute immediate value without immediate syntax
if (MO.isImm()) {
O << MO.getImm();
return false;
}
if (MO.isGlobal()) {
PrintSymbolOperand(MO, O);
return false;
}
return true;
case 'n': // Negate the immediate constant.
if (!MO.isImm())
return true;
O << -MO.getImm();
return false;
case 's': // The GCC deprecated s modifier
if (!MO.isImm())
return true;
O << ((32 - MO.getImm()) & 31);
return false;
}
}
return true;
}
bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
const char *ExtraCode, raw_ostream &O) {
// Target doesn't support this yet!
return true;
}
void AsmPrinter::emitInlineAsmStart() const {}
void AsmPrinter::emitInlineAsmEnd(const MCSubtargetInfo &StartInfo,
const MCSubtargetInfo *EndInfo) const {}
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