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Fix resetting the DataLayout in a Module.

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No tool does this currently, but as everything else in a module we should be
able to change its DataLayout.

Most of the fix is in DataLayout to make sure it can be reset properly.

The test uses Module::setDataLayout since the fact that we mutate a DataLayout
is an implementation detail. The module could hold a OwningPtr<DataLayout> and
the DataLayout itself could be immutable.

Thanks to Philip Reames for pushing me in the right direction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-02-25 22:23:04 +00:00
parent 9c256eccb3
commit 3f0a9af13b
4 changed files with 38 additions and 11 deletions
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18
lib/IR/DataLayout.cpp
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@ -176,7 +176,9 @@ static const LayoutAlignElem DefaultAlignments[] = {
{ AGGREGATE_ALIGN, 0, 0, 8 } // struct
};
void DataLayout::init(StringRef Desc) {
void DataLayout::reset(StringRef Desc) {
clear();
LayoutMap = 0;
LittleEndian = false;
StackNaturalAlign = 0;
@ -344,12 +346,12 @@ void DataLayout::parseSpecifier(StringRef Desc) {
}
}
DataLayout::DataLayout(const Module *M) {
DataLayout::DataLayout(const Module *M) : LayoutMap(0) {
const DataLayout *Other = M->getDataLayout();
if (Other)
*this = *Other;
else
init("");
reset("");
}
void
@ -469,8 +471,16 @@ public:
} // end anonymous namespace
void DataLayout::clear() {
LegalIntWidths.clear();
Alignments.clear();
Pointers.clear();
delete static_cast<StructLayoutMap *>(LayoutMap);
LayoutMap = 0;
}
DataLayout::~DataLayout() {
delete static_cast<StructLayoutMap*>(LayoutMap);
clear();
}
const StructLayout *DataLayout::getStructLayout(StructType *Ty) const {