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Use ManagedStatic to manage LayoutInfo, instead of rolling our own. 

llvm-svn: 34154
This commit is contained in:
Chris Lattner 2007-02-10 19:43:18 +00:00
parent 336e3962ff
commit 1e692e823c
1 changed files with 24 additions and 27 deletions
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51
llvm/lib/Target/TargetData.cpp
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@ -22,6 +22,7 @@
#include "llvm/Constants.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/ADT/StringExtras.h"
#include <algorithm>
#include <cstdlib>
@ -201,25 +202,23 @@ TargetData::TargetData(const Module *M) {
init(M->getDataLayout());
}
/// Layouts - The lazy cache of structure layout information maintained by
/// LayoutInfo - The lazy cache of structure layout information maintained by
/// TargetData.
///
static std::map<std::pair<const TargetData*,const StructType*>,
StructLayout> *Layouts = 0;
typedef std::pair<const TargetData*,const StructType*> LayoutKey;
static ManagedStatic<std::map<LayoutKey, StructLayout> > LayoutInfo;
TargetData::~TargetData() {
if (Layouts) {
if (LayoutInfo.isConstructed()) {
// Remove any layouts for this TD.
std::map<std::pair<const TargetData*,
const StructType*>, StructLayout>::iterator
I = Layouts->lower_bound(std::make_pair(this, (const StructType*)0));
while (I != Layouts->end() && I->first.first == this)
Layouts->erase(I++);
if (Layouts->empty()) {
delete Layouts;
Layouts = 0;
}
std::map<LayoutKey, StructLayout> &TheMap = *LayoutInfo;
std::map<LayoutKey, StructLayout>::iterator
I = TheMap.lower_bound(LayoutKey(this, (const StructType*)0));
for (std::map<LayoutKey, StructLayout>::iterator E = TheMap.end();
I != E && I->first.first == this; )
TheMap.erase(I++);
}
}
@ -252,17 +251,15 @@ std::string TargetData::getStringRepresentation() const {
}
const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
if (Layouts == 0)
Layouts = new std::map<std::pair<const TargetData*,const StructType*>,
StructLayout>();
std::map<std::pair<const TargetData*,const StructType*>,
StructLayout>::iterator
I = Layouts->lower_bound(std::make_pair(this, Ty));
if (I != Layouts->end() && I->first.first == this && I->first.second == Ty)
std::map<LayoutKey, StructLayout> &TheMap = *LayoutInfo;
std::map<LayoutKey, StructLayout>::iterator
I = TheMap.lower_bound(LayoutKey(this, Ty));
if (I != TheMap.end() && I->first.first == this && I->first.second == Ty)
return &I->second;
else {
return &Layouts->insert(I, std::make_pair(std::make_pair(this, Ty),
StructLayout(Ty, *this)))->second;
return &TheMap.insert(I, std::make_pair(LayoutKey(this, Ty),
StructLayout(Ty, *this)))->second;
}
}
@ -271,12 +268,12 @@ const StructLayout *TargetData::getStructLayout(const StructType *Ty) const {
/// removed, this method must be called whenever a StructType is removed to
/// avoid a dangling pointer in this cache.
void TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const {
if (!Layouts) return; // No cache.
if (!LayoutInfo.isConstructed()) return; // No cache.
std::map<std::pair<const TargetData*,const StructType*>,
StructLayout>::iterator I = Layouts->find(std::make_pair(this, Ty));
if (I != Layouts->end())
Layouts->erase(I);
std::map<LayoutKey, StructLayout>::iterator I =
LayoutInfo->find(std::make_pair(this, Ty));
if (I != LayoutInfo->end())
LayoutInfo->erase(I);
}