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add a StructLayout::getElementContainingOffset method.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20579 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-03-13 19:04:41 +00:00
parent 977df76722
commit e7ea48cb61
1 changed files with 17 additions and 0 deletions
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17
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 <algorithm>
using namespace llvm;
// Handle the Pass registration stuff necessary to use TargetData's.
@ -71,6 +72,22 @@ StructLayout::StructLayout(const StructType *ST, const TargetData &TD) {
StructSize = (StructSize/StructAlignment + 1) * StructAlignment;
}
/// getElementContainingOffset - Given a valid offset into the structure,
/// return the structure index that contains it.
unsigned StructLayout::getElementContainingOffset(uint64_t Offset) const {
std::vector<uint64_t>::const_iterator SI =
std::upper_bound(MemberOffsets.begin(), MemberOffsets.end(),
Offset);
assert(SI != MemberOffsets.begin() && "Offset not in structure type!");
--SI;
assert(*SI <= Offset && "upper_bound didn't work");
assert((SI == MemberOffsets.begin() || *(SI-1) < Offset) &&
(SI+1 == MemberOffsets.end() || *(SI+1) > Offset) &&
"Upper bound didn't work!");
return SI-MemberOffsets.begin();
}
//===----------------------------------------------------------------------===//
// TargetData Class Implementation
//===----------------------------------------------------------------------===//