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create symbols. It is extremely error prone and a source of a lot of the remaining integrated assembler bugs on x86-64. This fixes rdar://7807601. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99902 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
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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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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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using namespace llvm;
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MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) {
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}
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MCContext::~MCContext() {
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// NOTE: The sections are all allocated out of a bump pointer allocator,
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// we don't need to free them here.
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}
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MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) {
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assert(!Name.empty() && "Normal symbols cannot be unnamed!");
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// Determine whether this is an assembler temporary or normal label.
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bool isTemporary = Name.startswith(MAI.getPrivateGlobalPrefix());
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// Do the lookup and get the entire StringMapEntry. We want access to the
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// key if we are creating the entry.
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StringMapEntry<MCSymbol*> &Entry = Symbols.GetOrCreateValue(Name);
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if (Entry.getValue()) return Entry.getValue();
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// Ok, the entry doesn't already exist. Have the MCSymbol object itself refer
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// to the copy of the string that is embedded in the StringMapEntry.
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MCSymbol *Result = new (*this) MCSymbol(Entry.getKey(), isTemporary);
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Entry.setValue(Result);
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return Result;
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}
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MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) {
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SmallString<128> NameSV;
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Name.toVector(NameSV);
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return GetOrCreateSymbol(NameSV.str());
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}
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MCSymbol *MCContext::CreateTempSymbol() {
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return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
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"tmp" + Twine(NextUniqueID++));
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}
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MCSymbol *MCContext::LookupSymbol(StringRef Name) const {
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return Symbols.lookup(Name);
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}
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