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c0b9dc5be7
ilist of MachineInstr objects. This allows constant time removal and insertion of MachineInstr instances from anywhere in each MachineBasicBlock. It also allows for constant time splicing of MachineInstrs into or out of MachineBasicBlocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11340 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
2.4 KiB
C++
69 lines
2.4 KiB
C++
//===-- MachineCodeForInstruction.cpp -------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Representation of the sequence of machine instructions created for a single
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// VM instruction. Additionally records information about hidden and implicit
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// values used by the machine instructions: about hidden values used by the
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// machine instructions:
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//
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// "Temporary values" are intermediate values used in the machine instruction
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// sequence, but not in the VM instruction Note that such values should be
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// treated as pure SSA values with no interpretation of their operands (i.e., as
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// a TmpInstruction object which actually represents such a value).
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//
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// (2) "Implicit uses" are values used in the VM instruction but not in the
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// machine instruction sequence
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineCodeForInstruction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineInstrAnnot.h"
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#include "llvm/Instruction.h"
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using namespace llvm;
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AnnotationID llvm::MCFI_AID(
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AnnotationManager::getID("CodeGen::MachineCodeForInstruction"));
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static Annotation *CreateMCFI(AnnotationID AID, const Annotable *, void *) {
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assert(AID == MCFI_AID);
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return new MachineCodeForInstruction(); // Invoke constructor!
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}
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// Register the annotation with the annotation factory
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static struct MCFIInitializer {
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MCFIInitializer() {
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AnnotationManager::registerAnnotationFactory(MCFI_AID, &CreateMCFI);
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}
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} RegisterCreateMCFI;
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void
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MachineCodeForInstruction::dropAllReferences()
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{
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for (unsigned i=0, N=tempVec.size(); i < N; i++)
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cast<Instruction>(tempVec[i])->dropAllReferences();
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}
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MachineCodeForInstruction::~MachineCodeForInstruction() {
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// Let go of all uses in temp. instructions
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dropAllReferences();
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// Free the Value objects created to hold intermediate values
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for (unsigned i=0, N=tempVec.size(); i < N; i++)
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delete tempVec[i];
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// do not free the MachineInstr objects allocated. they are managed
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// by the ilist in MachineBasicBlock
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// Free the CallArgsDescriptor if it exists.
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delete callArgsDesc;
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}
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