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Simplify array bound checks and clarify comments. One element array can have same non-zero number as lower bound as well as upper bound.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129170 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2011-04-08 23:39:38 +00:00
parent 918035f802
commit 3f932a74be
2 changed files with 8 additions and 10 deletions
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15
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -1242,19 +1242,16 @@ void DwarfDebug::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy){
int64_t L = SR.getLo();
int64_t H = SR.getHi();
// The L value defines the lower bounds typically zero for C/C++. The H
// value is the upper bounds. Values are 64 bit. H - L + 1 is the size
// of the array. If L > H the array will be unbounded. If the L is
// non zero and same is H then also the array will be unbounded. If L is
// zero and H is zero then the array has one element and in such case do
// not emit lower bound.
// The L value defines the lower bounds which is typically zero for C/C++. The
// H value is the upper bounds. Values are 64 bit. H - L + 1 is the size
// of the array. If L > H then do not emit DW_AT_lower_bound and
// DW_AT_upper_bound attributes. If L is zero and H is also zero then the
// array has one element and in such case do not emit lower bound.
if (L > H || (L == H && L != 0)) {
// This is an unbounded subrange.
if (L > H) {
Buffer.addChild(DW_Subrange);
return;
}
if (L)
addSInt(DW_Subrange, dwarf::DW_AT_lower_bound, 0, L);
addSInt(DW_Subrange, dwarf::DW_AT_upper_bound, 0, H);