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c6f3ae5c66
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2397 91177308-0d34-0410-b5e6-96231b3b80d8
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
//===-- MachineCodeForInstruction.cpp -------------------------------------===//
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//
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// Representation of the sequence of machine instructions created
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// for a single VM instruction. Additionally records information
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// about hidden and implicit values used by the machine instructions:
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// about hidden values used by the machine instructions:
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//
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// "Temporary values" are intermediate values used in the machine
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// instruction sequence, but not in the VM instruction
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// Note that such values should be treated as pure SSA values with
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// no interpretation of their operands (i.e., as a TmpInstruction
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// 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
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// the 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/InstrSelection.h"
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static AnnotationID 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 Initializer {
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Initializer() {
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AnnotationManager::registerAnnotationFactory(MCFI_AID, &CreateMCFI);
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}
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} RegisterAID;
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MachineCodeForInstruction&
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MachineCodeForInstruction::get(const Instruction *I){
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return *(MachineCodeForInstruction*)I->getOrCreateAnnotation(MCFI_AID);
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}
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void
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MachineCodeForInstruction::destroy(const Instruction *I) {
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I->deleteAnnotation(MCFI_AID);
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}
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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<TmpInstruction>(tempVec[i])->dropAllReferences();
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}
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MachineCodeForInstruction::MachineCodeForInstruction()
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: Annotation(MCFI_AID)
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{}
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MachineCodeForInstruction::~MachineCodeForInstruction()
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{
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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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// Free the MachineInstr objects allocated, if any.
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for (unsigned i=0, N = size(); i < N; i++)
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delete (*this)[i];
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}
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