jankratochvil created this revision.
jankratochvil added a reviewer: clayborg.
Herald added a subscriber: JDevlieghere.
https://reviews.llvm.org/rL145086 introduced `m_die_array.shrink_to_fit()`
implemented by `exact_size_die_array.swap`, it was before LLVM became written
in C++11.
That is fine to use `shrink_to_fit()` now, right? Although I see no real
performance gain by a simple `time` test.
https://reviews.llvm.org/D47492
Files:
source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
Index: source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
===================================================================
--- source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
+++ source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
@@ -180,15 +180,7 @@
m_first_die = m_die_array.front();
}
- // Since std::vector objects will double their size, we really need to make a
- // new array with the perfect size so we don't end up wasting space. So here
- // we copy and swap to make sure we don't have any extra memory taken up.
-
- if (m_die_array.size() < m_die_array.capacity()) {
- DWARFDebugInfoEntry::collection exact_size_die_array(m_die_array.begin(),
- m_die_array.end());
- exact_size_die_array.swap(m_die_array);
- }
+ m_die_array.shrink_to_fit();
ExtractDIEsEndCheck(offset);
Index: source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
===================================================================
--- source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
+++ source/Plugins/SymbolFile/DWARF/DWARFUnit.cpp
@@ -180,15 +180,7 @@
m_first_die = m_die_array.front();
}
- // Since std::vector objects will double their size, we really need to make a
- // new array with the perfect size so we don't end up wasting space. So here
- // we copy and swap to make sure we don't have any extra memory taken up.
-
- if (m_die_array.size() < m_die_array.capacity()) {
- DWARFDebugInfoEntry::collection exact_size_die_array(m_die_array.begin(),
- m_die_array.end());
- exact_size_die_array.swap(m_die_array);
- }
+ m_die_array.shrink_to_fit();
ExtractDIEsEndCheck(offset);
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