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c36d033c08
Bulk move of TargetInstrInfo implementation into TargetInstrInfoImpl. This is dirty because the code isn't part of TargetInstrInfoImpl class, nor should it be, because the methods are not target hooks. However, it's the current mechanism for keeping libTarget useful outside the backend. You'll get a not-so-nice link error if you invoke a TargetInstrInfo method that depends on CodeGen. The TargetInstrInfoImpl class should probably be removed since it doesn't really solve this problem. To really fix this, we probably need separate interfaces for the CodeGen/nonCodeGen sides of TargetInstrInfo. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158212 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
//===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
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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 TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInstrItineraries.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cctype>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// TargetInstrInfo
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//
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// Methods that depend on CodeGen are implemented in
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// TargetInstrInfoImpl.cpp. Invoking them without linking libCodeGen raises a
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// link error.
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// ===----------------------------------------------------------------------===//
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TargetInstrInfo::~TargetInstrInfo() {
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}
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const TargetRegisterClass*
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TargetInstrInfo::getRegClass(const MCInstrDesc &MCID, unsigned OpNum,
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const TargetRegisterInfo *TRI,
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const MachineFunction &MF) const {
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if (OpNum >= MCID.getNumOperands())
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return 0;
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short RegClass = MCID.OpInfo[OpNum].RegClass;
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if (MCID.OpInfo[OpNum].isLookupPtrRegClass())
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return TRI->getPointerRegClass(MF, RegClass);
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// Instructions like INSERT_SUBREG do not have fixed register classes.
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if (RegClass < 0)
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return 0;
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// Otherwise just look it up normally.
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return TRI->getRegClass(RegClass);
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}
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/// insertNoop - Insert a noop into the instruction stream at the specified
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/// point.
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void TargetInstrInfo::insertNoop(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const {
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llvm_unreachable("Target didn't implement insertNoop!");
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}
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/// Measure the specified inline asm to determine an approximation of its
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/// length.
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/// Comments (which run till the next SeparatorString or newline) do not
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/// count as an instruction.
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/// Any other non-whitespace text is considered an instruction, with
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/// multiple instructions separated by SeparatorString or newlines.
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/// Variable-length instructions are not handled here; this function
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/// may be overloaded in the target code to do that.
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unsigned TargetInstrInfo::getInlineAsmLength(const char *Str,
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const MCAsmInfo &MAI) const {
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// Count the number of instructions in the asm.
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bool atInsnStart = true;
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unsigned Length = 0;
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for (; *Str; ++Str) {
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if (*Str == '\n' || strncmp(Str, MAI.getSeparatorString(),
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strlen(MAI.getSeparatorString())) == 0)
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atInsnStart = true;
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if (atInsnStart && !std::isspace(*Str)) {
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Length += MAI.getMaxInstLength();
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atInsnStart = false;
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}
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if (atInsnStart && strncmp(Str, MAI.getCommentString(),
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strlen(MAI.getCommentString())) == 0)
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atInsnStart = false;
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}
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return Length;
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}
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