mirror of
https://github.com/c64scene-ar/llvm-6502.git
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0b8c9a80f2
into their new header subdirectory: include/llvm/IR. This matches the directory structure of lib, and begins to correct a long standing point of file layout clutter in LLVM. There are still more header files to move here, but I wanted to handle them in separate commits to make tracking what files make sense at each layer easier. The only really questionable files here are the target intrinsic tablegen files. But that's a battle I'd rather not fight today. I've updated both CMake and Makefile build systems (I think, and my tests think, but I may have missed something). I've also re-sorted the includes throughout the project. I'll be committing updates to Clang, DragonEgg, and Polly momentarily. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171366 91177308-0d34-0410-b5e6-96231b3b80d8
146 lines
4.0 KiB
C++
146 lines
4.0 KiB
C++
//===-- Use.cpp - Implement the Use class ---------------------------------===//
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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 algorithm for finding the User of a Use.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Value.h"
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#include <new>
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// Use swap Implementation
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//===----------------------------------------------------------------------===//
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void Use::swap(Use &RHS) {
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Value *V1(Val);
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Value *V2(RHS.Val);
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if (V1 != V2) {
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if (V1) {
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removeFromList();
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}
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if (V2) {
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RHS.removeFromList();
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Val = V2;
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V2->addUse(*this);
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} else {
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Val = 0;
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}
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if (V1) {
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RHS.Val = V1;
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V1->addUse(RHS);
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} else {
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RHS.Val = 0;
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// Use getImpliedUser Implementation
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//===----------------------------------------------------------------------===//
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const Use *Use::getImpliedUser() const {
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const Use *Current = this;
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while (true) {
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unsigned Tag = (Current++)->Prev.getInt();
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switch (Tag) {
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case zeroDigitTag:
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case oneDigitTag:
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continue;
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case stopTag: {
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++Current;
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ptrdiff_t Offset = 1;
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while (true) {
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unsigned Tag = Current->Prev.getInt();
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switch (Tag) {
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case zeroDigitTag:
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case oneDigitTag:
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++Current;
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Offset = (Offset << 1) + Tag;
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continue;
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default:
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return Current + Offset;
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}
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}
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}
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case fullStopTag:
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return Current;
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// Use initTags Implementation
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//===----------------------------------------------------------------------===//
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Use *Use::initTags(Use * const Start, Use *Stop) {
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ptrdiff_t Done = 0;
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while (Done < 20) {
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if (Start == Stop--)
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return Start;
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static const PrevPtrTag tags[20] = { fullStopTag, oneDigitTag, stopTag,
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oneDigitTag, oneDigitTag, stopTag,
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zeroDigitTag, oneDigitTag, oneDigitTag,
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stopTag, zeroDigitTag, oneDigitTag,
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zeroDigitTag, oneDigitTag, stopTag,
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oneDigitTag, oneDigitTag, oneDigitTag,
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oneDigitTag, stopTag
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};
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new(Stop) Use(tags[Done++]);
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}
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ptrdiff_t Count = Done;
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while (Start != Stop) {
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--Stop;
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if (!Count) {
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new(Stop) Use(stopTag);
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++Done;
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Count = Done;
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} else {
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new(Stop) Use(PrevPtrTag(Count & 1));
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Count >>= 1;
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++Done;
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}
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}
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return Start;
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}
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//===----------------------------------------------------------------------===//
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// Use zap Implementation
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//===----------------------------------------------------------------------===//
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void Use::zap(Use *Start, const Use *Stop, bool del) {
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while (Start != Stop)
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(--Stop)->~Use();
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if (del)
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::operator delete(Start);
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}
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//===----------------------------------------------------------------------===//
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// Use getUser Implementation
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//===----------------------------------------------------------------------===//
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User *Use::getUser() const {
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const Use *End = getImpliedUser();
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const UserRef *ref = reinterpret_cast<const UserRef*>(End);
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return ref->getInt()
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? ref->getPointer()
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: (User*)End;
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}
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} // End llvm namespace
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