forked from OSchip/llvm-project
656 lines
25 KiB
C++
656 lines
25 KiB
C++
//===-- AsmPrinterInlineAsm.cpp - AsmPrinter Inline Asm Handling ----------===//
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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 implements the inline assembler pieces of the AsmPrinter class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/CodeGen/TargetRegisterInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/InlineAsm.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCParser/MCTargetAsmParser.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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/// srcMgrDiagHandler - This callback is invoked when the SourceMgr for an
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/// inline asm has an error in it. diagInfo is a pointer to the SrcMgrDiagInfo
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/// struct above.
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static void srcMgrDiagHandler(const SMDiagnostic &Diag, void *diagInfo) {
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AsmPrinter::SrcMgrDiagInfo *DiagInfo =
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static_cast<AsmPrinter::SrcMgrDiagInfo *>(diagInfo);
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assert(DiagInfo && "Diagnostic context not passed down?");
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// Look up a LocInfo for the buffer this diagnostic is coming from.
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unsigned BufNum = DiagInfo->SrcMgr.FindBufferContainingLoc(Diag.getLoc());
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const MDNode *LocInfo = nullptr;
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if (BufNum > 0 && BufNum <= DiagInfo->LocInfos.size())
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LocInfo = DiagInfo->LocInfos[BufNum-1];
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// If the inline asm had metadata associated with it, pull out a location
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// cookie corresponding to which line the error occurred on.
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unsigned LocCookie = 0;
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if (LocInfo) {
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unsigned ErrorLine = Diag.getLineNo()-1;
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if (ErrorLine >= LocInfo->getNumOperands())
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ErrorLine = 0;
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if (LocInfo->getNumOperands() != 0)
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if (const ConstantInt *CI =
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mdconst::dyn_extract<ConstantInt>(LocInfo->getOperand(ErrorLine)))
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LocCookie = CI->getZExtValue();
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}
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DiagInfo->DiagHandler(Diag, DiagInfo->DiagContext, LocCookie);
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}
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unsigned AsmPrinter::addInlineAsmDiagBuffer(StringRef AsmStr,
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const MDNode *LocMDNode) const {
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if (!DiagInfo) {
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DiagInfo = make_unique<SrcMgrDiagInfo>();
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MCContext &Context = MMI->getContext();
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Context.setInlineSourceManager(&DiagInfo->SrcMgr);
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LLVMContext &LLVMCtx = MMI->getModule()->getContext();
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if (LLVMCtx.getInlineAsmDiagnosticHandler()) {
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DiagInfo->DiagHandler = LLVMCtx.getInlineAsmDiagnosticHandler();
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DiagInfo->DiagContext = LLVMCtx.getInlineAsmDiagnosticContext();
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DiagInfo->SrcMgr.setDiagHandler(srcMgrDiagHandler, DiagInfo.get());
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}
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}
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SourceMgr &SrcMgr = DiagInfo->SrcMgr;
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std::unique_ptr<MemoryBuffer> Buffer;
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// The inline asm source manager will outlive AsmStr, so make a copy of the
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// string for SourceMgr to own.
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Buffer = MemoryBuffer::getMemBufferCopy(AsmStr, "<inline asm>");
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// Tell SrcMgr about this buffer, it takes ownership of the buffer.
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unsigned BufNum = SrcMgr.AddNewSourceBuffer(std::move(Buffer), SMLoc());
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// Store LocMDNode in DiagInfo, using BufNum as an identifier.
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if (LocMDNode) {
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DiagInfo->LocInfos.resize(BufNum);
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DiagInfo->LocInfos[BufNum - 1] = LocMDNode;
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}
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return BufNum;
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}
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/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
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void AsmPrinter::EmitInlineAsm(StringRef Str, const MCSubtargetInfo &STI,
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const MCTargetOptions &MCOptions,
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const MDNode *LocMDNode,
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InlineAsm::AsmDialect Dialect) const {
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assert(!Str.empty() && "Can't emit empty inline asm block");
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// Remember if the buffer is nul terminated or not so we can avoid a copy.
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bool isNullTerminated = Str.back() == 0;
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if (isNullTerminated)
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Str = Str.substr(0, Str.size()-1);
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// If the output streamer does not have mature MC support or the integrated
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// assembler has been disabled, just emit the blob textually.
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// Otherwise parse the asm and emit it via MC support.
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// This is useful in case the asm parser doesn't handle something but the
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// system assembler does.
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const MCAsmInfo *MCAI = TM.getMCAsmInfo();
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assert(MCAI && "No MCAsmInfo");
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if (!MCAI->useIntegratedAssembler() &&
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!OutStreamer->isIntegratedAssemblerRequired()) {
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emitInlineAsmStart();
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OutStreamer->EmitRawText(Str);
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emitInlineAsmEnd(STI, nullptr);
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return;
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}
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unsigned BufNum = addInlineAsmDiagBuffer(Str, LocMDNode);
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DiagInfo->SrcMgr.setIncludeDirs(MCOptions.IASSearchPaths);
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std::unique_ptr<MCAsmParser> Parser(createMCAsmParser(
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DiagInfo->SrcMgr, OutContext, *OutStreamer, *MAI, BufNum));
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// Do not use assembler-level information for parsing inline assembly.
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OutStreamer->setUseAssemblerInfoForParsing(false);
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// We create a new MCInstrInfo here since we might be at the module level
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// and not have a MachineFunction to initialize the TargetInstrInfo from and
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// we only need MCInstrInfo for asm parsing. We create one unconditionally
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// because it's not subtarget dependent.
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std::unique_ptr<MCInstrInfo> MII(TM.getTarget().createMCInstrInfo());
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std::unique_ptr<MCTargetAsmParser> TAP(TM.getTarget().createMCAsmParser(
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STI, *Parser, *MII, MCOptions));
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if (!TAP)
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report_fatal_error("Inline asm not supported by this streamer because"
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" we don't have an asm parser for this target\n");
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Parser->setAssemblerDialect(Dialect);
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Parser->setTargetParser(*TAP.get());
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Parser->setEnablePrintSchedInfo(EnablePrintSchedInfo);
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// Enable lexing Masm binary and hex integer literals in intel inline
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// assembly.
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if (Dialect == InlineAsm::AD_Intel)
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Parser->getLexer().setLexMasmIntegers(true);
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if (MF) {
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const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
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TAP->SetFrameRegister(TRI->getFrameRegister(*MF));
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}
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emitInlineAsmStart();
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// Don't implicitly switch to the text section before the asm.
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int Res = Parser->Run(/*NoInitialTextSection*/ true,
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/*NoFinalize*/ true);
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emitInlineAsmEnd(STI, &TAP->getSTI());
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if (Res && !DiagInfo->DiagHandler)
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report_fatal_error("Error parsing inline asm\n");
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}
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static void EmitMSInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
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MachineModuleInfo *MMI, int InlineAsmVariant,
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AsmPrinter *AP, unsigned LocCookie,
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raw_ostream &OS) {
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// Switch to the inline assembly variant.
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OS << "\t.intel_syntax\n\t";
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const char *LastEmitted = AsmStr; // One past the last character emitted.
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unsigned NumOperands = MI->getNumOperands();
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while (*LastEmitted) {
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switch (*LastEmitted) {
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default: {
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// Not a special case, emit the string section literally.
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const char *LiteralEnd = LastEmitted+1;
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while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
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*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
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++LiteralEnd;
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OS.write(LastEmitted, LiteralEnd-LastEmitted);
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LastEmitted = LiteralEnd;
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break;
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}
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case '\n':
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++LastEmitted; // Consume newline character.
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OS << '\n'; // Indent code with newline.
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break;
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case '$': {
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++LastEmitted; // Consume '$' character.
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bool Done = true;
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// Handle escapes.
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switch (*LastEmitted) {
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default: Done = false; break;
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case '$':
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++LastEmitted; // Consume second '$' character.
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break;
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}
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if (Done) break;
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// If we have ${:foo}, then this is not a real operand reference, it is a
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// "magic" string reference, just like in .td files. Arrange to call
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// PrintSpecial.
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if (LastEmitted[0] == '{' && LastEmitted[1] == ':') {
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LastEmitted += 2;
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const char *StrStart = LastEmitted;
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const char *StrEnd = strchr(StrStart, '}');
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if (!StrEnd)
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report_fatal_error("Unterminated ${:foo} operand in inline asm"
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" string: '" + Twine(AsmStr) + "'");
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std::string Val(StrStart, StrEnd);
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AP->PrintSpecial(MI, OS, Val.c_str());
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LastEmitted = StrEnd+1;
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break;
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}
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const char *IDStart = LastEmitted;
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const char *IDEnd = IDStart;
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while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
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unsigned Val;
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if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
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report_fatal_error("Bad $ operand number in inline asm string: '" +
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Twine(AsmStr) + "'");
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LastEmitted = IDEnd;
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if (Val >= NumOperands-1)
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report_fatal_error("Invalid $ operand number in inline asm string: '" +
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Twine(AsmStr) + "'");
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// Okay, we finally have a value number. Ask the target to print this
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// operand!
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unsigned OpNo = InlineAsm::MIOp_FirstOperand;
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bool Error = false;
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// Scan to find the machine operand number for the operand.
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for (; Val; --Val) {
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if (OpNo >= MI->getNumOperands()) break;
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unsigned OpFlags = MI->getOperand(OpNo).getImm();
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OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
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}
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// We may have a location metadata attached to the end of the
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// instruction, and at no point should see metadata at any
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// other point while processing. It's an error if so.
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if (OpNo >= MI->getNumOperands() ||
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MI->getOperand(OpNo).isMetadata()) {
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Error = true;
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} else {
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unsigned OpFlags = MI->getOperand(OpNo).getImm();
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++OpNo; // Skip over the ID number.
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if (InlineAsm::isMemKind(OpFlags)) {
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Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
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/*Modifier*/ nullptr, OS);
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} else {
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Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
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/*Modifier*/ nullptr, OS);
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}
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}
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if (Error) {
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std::string msg;
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raw_string_ostream Msg(msg);
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Msg << "invalid operand in inline asm: '" << AsmStr << "'";
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MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
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}
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break;
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}
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}
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}
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OS << "\n\t.att_syntax\n" << (char)0; // null terminate string.
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}
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static void EmitGCCInlineAsmStr(const char *AsmStr, const MachineInstr *MI,
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MachineModuleInfo *MMI, int InlineAsmVariant,
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int AsmPrinterVariant, AsmPrinter *AP,
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unsigned LocCookie, raw_ostream &OS) {
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int CurVariant = -1; // The number of the {.|.|.} region we are in.
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const char *LastEmitted = AsmStr; // One past the last character emitted.
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unsigned NumOperands = MI->getNumOperands();
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OS << '\t';
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while (*LastEmitted) {
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switch (*LastEmitted) {
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default: {
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// Not a special case, emit the string section literally.
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const char *LiteralEnd = LastEmitted+1;
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while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
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*LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
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++LiteralEnd;
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if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
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OS.write(LastEmitted, LiteralEnd-LastEmitted);
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LastEmitted = LiteralEnd;
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break;
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}
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case '\n':
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++LastEmitted; // Consume newline character.
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OS << '\n'; // Indent code with newline.
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break;
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case '$': {
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++LastEmitted; // Consume '$' character.
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bool Done = true;
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// Handle escapes.
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switch (*LastEmitted) {
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default: Done = false; break;
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case '$': // $$ -> $
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if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
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OS << '$';
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++LastEmitted; // Consume second '$' character.
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break;
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case '(': // $( -> same as GCC's { character.
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++LastEmitted; // Consume '(' character.
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if (CurVariant != -1)
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report_fatal_error("Nested variants found in inline asm string: '" +
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Twine(AsmStr) + "'");
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CurVariant = 0; // We're in the first variant now.
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break;
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case '|':
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++LastEmitted; // consume '|' character.
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if (CurVariant == -1)
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OS << '|'; // this is gcc's behavior for | outside a variant
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else
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++CurVariant; // We're in the next variant.
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break;
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case ')': // $) -> same as GCC's } char.
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++LastEmitted; // consume ')' character.
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if (CurVariant == -1)
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OS << '}'; // this is gcc's behavior for } outside a variant
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else
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CurVariant = -1;
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break;
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}
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if (Done) break;
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bool HasCurlyBraces = false;
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if (*LastEmitted == '{') { // ${variable}
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++LastEmitted; // Consume '{' character.
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HasCurlyBraces = true;
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}
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// If we have ${:foo}, then this is not a real operand reference, it is a
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// "magic" string reference, just like in .td files. Arrange to call
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// PrintSpecial.
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if (HasCurlyBraces && *LastEmitted == ':') {
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++LastEmitted;
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const char *StrStart = LastEmitted;
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const char *StrEnd = strchr(StrStart, '}');
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if (!StrEnd)
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report_fatal_error("Unterminated ${:foo} operand in inline asm"
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" string: '" + Twine(AsmStr) + "'");
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std::string Val(StrStart, StrEnd);
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AP->PrintSpecial(MI, OS, Val.c_str());
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LastEmitted = StrEnd+1;
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break;
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}
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const char *IDStart = LastEmitted;
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const char *IDEnd = IDStart;
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while (*IDEnd >= '0' && *IDEnd <= '9') ++IDEnd;
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unsigned Val;
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if (StringRef(IDStart, IDEnd-IDStart).getAsInteger(10, Val))
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report_fatal_error("Bad $ operand number in inline asm string: '" +
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Twine(AsmStr) + "'");
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LastEmitted = IDEnd;
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char Modifier[2] = { 0, 0 };
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if (HasCurlyBraces) {
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// If we have curly braces, check for a modifier character. This
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// supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
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if (*LastEmitted == ':') {
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++LastEmitted; // Consume ':' character.
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if (*LastEmitted == 0)
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report_fatal_error("Bad ${:} expression in inline asm string: '" +
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Twine(AsmStr) + "'");
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Modifier[0] = *LastEmitted;
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++LastEmitted; // Consume modifier character.
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}
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if (*LastEmitted != '}')
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report_fatal_error("Bad ${} expression in inline asm string: '" +
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Twine(AsmStr) + "'");
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++LastEmitted; // Consume '}' character.
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}
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if (Val >= NumOperands-1)
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report_fatal_error("Invalid $ operand number in inline asm string: '" +
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Twine(AsmStr) + "'");
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// Okay, we finally have a value number. Ask the target to print this
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// operand!
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if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
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unsigned OpNo = InlineAsm::MIOp_FirstOperand;
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bool Error = false;
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// Scan to find the machine operand number for the operand.
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for (; Val; --Val) {
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if (OpNo >= MI->getNumOperands()) break;
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unsigned OpFlags = MI->getOperand(OpNo).getImm();
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OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
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}
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// We may have a location metadata attached to the end of the
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// instruction, and at no point should see metadata at any
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// other point while processing. It's an error if so.
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if (OpNo >= MI->getNumOperands() ||
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MI->getOperand(OpNo).isMetadata()) {
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Error = true;
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} else {
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unsigned OpFlags = MI->getOperand(OpNo).getImm();
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++OpNo; // Skip over the ID number.
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if (Modifier[0] == 'l') { // Labels are target independent.
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// FIXME: What if the operand isn't an MBB, report error?
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const MCSymbol *Sym = MI->getOperand(OpNo).getMBB()->getSymbol();
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Sym->print(OS, AP->MAI);
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} else {
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if (InlineAsm::isMemKind(OpFlags)) {
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Error = AP->PrintAsmMemoryOperand(MI, OpNo, InlineAsmVariant,
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Modifier[0] ? Modifier : nullptr,
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OS);
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} else {
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Error = AP->PrintAsmOperand(MI, OpNo, InlineAsmVariant,
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Modifier[0] ? Modifier : nullptr, OS);
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}
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}
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}
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if (Error) {
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std::string msg;
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raw_string_ostream Msg(msg);
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Msg << "invalid operand in inline asm: '" << AsmStr << "'";
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MMI->getModule()->getContext().emitError(LocCookie, Msg.str());
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}
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}
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break;
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}
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}
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}
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OS << '\n' << (char)0; // null terminate string.
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}
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/// EmitInlineAsm - This method formats and emits the specified machine
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/// instruction that is an inline asm.
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void AsmPrinter::EmitInlineAsm(const MachineInstr *MI) const {
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assert(MI->isInlineAsm() && "printInlineAsm only works on inline asms");
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// Count the number of register definitions to find the asm string.
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unsigned NumDefs = 0;
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for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
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++NumDefs)
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assert(NumDefs != MI->getNumOperands()-2 && "No asm string?");
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assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
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// Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
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const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
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// If this asmstr is empty, just print the #APP/#NOAPP markers.
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// These are useful to see where empty asm's wound up.
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if (AsmStr[0] == 0) {
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OutStreamer->emitRawComment(MAI->getInlineAsmStart());
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OutStreamer->emitRawComment(MAI->getInlineAsmEnd());
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return;
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}
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// Emit the #APP start marker. This has to happen even if verbose-asm isn't
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// enabled, so we use emitRawComment.
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OutStreamer->emitRawComment(MAI->getInlineAsmStart());
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// Get the !srcloc metadata node if we have it, and decode the loc cookie from
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// it.
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unsigned LocCookie = 0;
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const MDNode *LocMD = nullptr;
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for (unsigned i = MI->getNumOperands(); i != 0; --i) {
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if (MI->getOperand(i-1).isMetadata() &&
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(LocMD = MI->getOperand(i-1).getMetadata()) &&
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LocMD->getNumOperands() != 0) {
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if (const ConstantInt *CI =
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mdconst::dyn_extract<ConstantInt>(LocMD->getOperand(0))) {
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LocCookie = CI->getZExtValue();
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break;
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}
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}
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}
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// Emit the inline asm to a temporary string so we can emit it through
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// EmitInlineAsm.
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SmallString<256> StringData;
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raw_svector_ostream OS(StringData);
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// The variant of the current asmprinter.
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int AsmPrinterVariant = MAI->getAssemblerDialect();
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InlineAsm::AsmDialect InlineAsmVariant = MI->getInlineAsmDialect();
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AsmPrinter *AP = const_cast<AsmPrinter*>(this);
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if (InlineAsmVariant == InlineAsm::AD_ATT)
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EmitGCCInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AsmPrinterVariant,
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AP, LocCookie, OS);
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else
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EmitMSInlineAsmStr(AsmStr, MI, MMI, InlineAsmVariant, AP, LocCookie, OS);
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// Reset SanitizeAddress based on the function's attribute.
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MCTargetOptions MCOptions = TM.Options.MCOptions;
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MCOptions.SanitizeAddress =
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MF->getFunction().hasFnAttribute(Attribute::SanitizeAddress);
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// Emit warnings if we use reserved registers on the clobber list, as
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// that might give surprising results.
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std::vector<std::string> RestrRegs;
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// Start with the first operand descriptor, and iterate over them.
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for (unsigned I = InlineAsm::MIOp_FirstOperand, NumOps = MI->getNumOperands();
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I < NumOps; ++I) {
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const MachineOperand &MO = MI->getOperand(I);
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if (MO.isImm()) {
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unsigned Flags = MO.getImm();
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const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
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if (InlineAsm::getKind(Flags) == InlineAsm::Kind_Clobber &&
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!TRI->isAsmClobberable(*MF, MI->getOperand(I + 1).getReg())) {
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RestrRegs.push_back(TRI->getName(MI->getOperand(I + 1).getReg()));
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|
}
|
|
// 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 = DiagInfo->SrcMgr;
|
|
SMLoc Loc = SMLoc::getFromPointer(
|
|
SrcMgr.getMemoryBuffer(BufNum)->getBuffer().begin());
|
|
|
|
std::string Msg = "inline asm clobber list contains reserved registers: ";
|
|
for (auto I = RestrRegs.begin(), E = RestrRegs.end(); I != E; I++) {
|
|
if(I != RestrRegs.begin())
|
|
Msg += ", ";
|
|
Msg += *I;
|
|
}
|
|
std::string 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(), 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());
|
|
}
|
|
}
|
|
|
|
/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
|
|
/// instruction, using the specified assembler variant. Targets should
|
|
/// override this to format as appropriate.
|
|
bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
|
|
unsigned AsmVariant, 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.
|
|
|
|
const MachineOperand &MO = MI->getOperand(OpNo);
|
|
switch (ExtraCode[0]) {
|
|
default:
|
|
return true; // Unknown modifier.
|
|
case 'c': // Substitute immediate value without immediate syntax
|
|
if (MO.getType() != MachineOperand::MO_Immediate)
|
|
return true;
|
|
O << MO.getImm();
|
|
return false;
|
|
case 'n': // Negate the immediate constant.
|
|
if (MO.getType() != MachineOperand::MO_Immediate)
|
|
return true;
|
|
O << -MO.getImm();
|
|
return false;
|
|
case 's': // The GCC deprecated s modifier
|
|
if (MO.getType() != MachineOperand::MO_Immediate)
|
|
return true;
|
|
O << ((32 - MO.getImm()) & 31);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
|
|
unsigned AsmVariant,
|
|
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 {}
|