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author | jk <jk@vin.ovh> | 2021-05-29 23:56:51 -0500 |
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committer | jk <jk@vin.ovh> | 2021-05-29 23:56:51 -0500 |
commit | c5f20aa73a2847b42d2c9c1a7f66cdb335c5353e (patch) | |
tree | 0ae408161d2cccc31c41996d1262dd62ddd1f02e /sql-make-VirtualCursor-standard-layout-type.patch | |
parent | 6225a81337ddf987f1adc39c70d86354a61c25b0 (diff) | |
download | ungoogled-chromium-c5f20aa73a2847b42d2c9c1a7f66cdb335c5353e.tar.gz ungoogled-chromium-c5f20aa73a2847b42d2c9c1a7f66cdb335c5353e.tar.bz2 ungoogled-chromium-c5f20aa73a2847b42d2c9c1a7f66cdb335c5353e.zip |
upgpkg: ungoogled-chromium 91.0.4472.77-1
upstream release
Diffstat (limited to 'sql-make-VirtualCursor-standard-layout-type.patch')
-rw-r--r-- | sql-make-VirtualCursor-standard-layout-type.patch | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/sql-make-VirtualCursor-standard-layout-type.patch b/sql-make-VirtualCursor-standard-layout-type.patch new file mode 100644 index 0000000..c1c68f1 --- /dev/null +++ b/sql-make-VirtualCursor-standard-layout-type.patch @@ -0,0 +1,238 @@ +From 80368f8ba7a8bab13440463a254888311efe3986 Mon Sep 17 00:00:00 2001 +From: Stephan Hartmann <stha09@googlemail.com> +Date: Tue, 4 May 2021 15:00:19 +0000 +Subject: [PATCH] sql: make VirtualCursor standard layout type + +sql::recover::VirtualCursor needs to be a standard layout type, but +has members of type std::unique_ptr. However, std::unique_ptr is not +guaranteed to be standard layout. Compiling with clang combined with +gcc-11 libstdc++ fails because of this. Replace std::unique_ptr with +raw pointers. + +Bug: 1189788 +Change-Id: Ia6dc388cc5ef1c0f2afc75f8ca45b9f12687ca9c +--- + sql/recover_module/btree.cc | 21 +++++++++++++++------ + sql/recover_module/btree.h | 17 +++++++++++++---- + sql/recover_module/cursor.cc | 24 ++++++++++++------------ + sql/recover_module/cursor.h | 2 +- + sql/recover_module/pager.cc | 7 +++---- + sql/recover_module/pager.h | 5 +++-- + 6 files changed, 47 insertions(+), 29 deletions(-) + +diff --git a/sql/recover_module/btree.cc b/sql/recover_module/btree.cc +index 9ecaafe8a3..839318abf9 100644 +--- a/sql/recover_module/btree.cc ++++ b/sql/recover_module/btree.cc +@@ -135,16 +135,25 @@ static_assert(std::is_trivially_destructible<LeafPageDecoder>::value, + "Move the destructor to the .cc file if it's non-trival"); + #endif // !DCHECK_IS_ON() + +-LeafPageDecoder::LeafPageDecoder(DatabasePageReader* db_reader) noexcept +- : page_id_(db_reader->page_id()), +- db_reader_(db_reader), +- cell_count_(ComputeCellCount(db_reader)), +- next_read_index_(0), +- last_record_size_(0) { ++void LeafPageDecoder::Initialize(DatabasePageReader* db_reader) { ++ DCHECK(db_reader); + DCHECK(IsOnValidPage(db_reader)); ++ page_id_ = db_reader->page_id(); ++ db_reader_ = db_reader; ++ cell_count_ = ComputeCellCount(db_reader); ++ next_read_index_ = 0; ++ last_record_size_ = 0; + DCHECK(DatabasePageReader::IsValidPageId(page_id_)); + } + ++void LeafPageDecoder::Reset() { ++ db_reader_ = nullptr; ++ page_id_ = 0; ++ cell_count_ = 0; ++ next_read_index_ = 0; ++ last_record_size_ = 0; ++} ++ + bool LeafPageDecoder::TryAdvance() { + DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); + DCHECK(CanAdvance()); +diff --git a/sql/recover_module/btree.h b/sql/recover_module/btree.h +index d76d076bf6..33114b01fa 100644 +--- a/sql/recover_module/btree.h ++++ b/sql/recover_module/btree.h +@@ -102,7 +102,7 @@ class LeafPageDecoder { + // + // |db_reader| must have been used to read an inner page of a table B-tree. + // |db_reader| must outlive this instance. +- explicit LeafPageDecoder(DatabasePageReader* db_reader) noexcept; ++ explicit LeafPageDecoder() noexcept = default; + ~LeafPageDecoder() noexcept = default; + + LeafPageDecoder(const LeafPageDecoder&) = delete; +@@ -150,6 +150,15 @@ class LeafPageDecoder { + // read as long as CanAdvance() returns true. + bool TryAdvance(); + ++ // Initialize with DatabasePageReader ++ void Initialize(DatabasePageReader* db_reader); ++ ++ // Reset internal DatabasePageReader ++ void Reset(); ++ ++ // True if DatabasePageReader is valid ++ bool IsValid() { return (db_reader_ != nullptr); } ++ + // True if the given reader may point to an inner page in a table B-tree. + // + // The last ReadPage() call on |db_reader| must have succeeded. +@@ -163,14 +172,14 @@ class LeafPageDecoder { + static int ComputeCellCount(DatabasePageReader* db_reader); + + // The number of the B-tree page this reader is reading. +- const int64_t page_id_; ++ int64_t page_id_; + // Used to read the tree page. + // + // Raw pointer usage is acceptable because this instance's owner is expected + // to ensure that the DatabasePageReader outlives this. +- DatabasePageReader* const db_reader_; ++ DatabasePageReader* db_reader_; + // Caches the ComputeCellCount() value for this reader's page. +- const int cell_count_ = ComputeCellCount(db_reader_); ++ int cell_count_; + + // The reader's cursor state. + // +diff --git a/sql/recover_module/cursor.cc b/sql/recover_module/cursor.cc +index 0029ff9295..42548bc4b5 100644 +--- a/sql/recover_module/cursor.cc ++++ b/sql/recover_module/cursor.cc +@@ -26,7 +26,7 @@ VirtualCursor::~VirtualCursor() { + int VirtualCursor::First() { + DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); + inner_decoders_.clear(); +- leaf_decoder_ = nullptr; ++ leaf_decoder_.Reset(); + + AppendPageDecoder(table_->root_page_id()); + return Next(); +@@ -36,18 +36,18 @@ int VirtualCursor::Next() { + DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); + record_reader_.Reset(); + +- while (!inner_decoders_.empty() || leaf_decoder_.get()) { +- if (leaf_decoder_.get()) { +- if (!leaf_decoder_->CanAdvance()) { ++ while (!inner_decoders_.empty() || leaf_decoder_.IsValid()) { ++ if (leaf_decoder_.IsValid()) { ++ if (!leaf_decoder_.CanAdvance()) { + // The leaf has been exhausted. Remove it from the DFS stack. +- leaf_decoder_ = nullptr; ++ leaf_decoder_.Reset(); + continue; + } +- if (!leaf_decoder_->TryAdvance()) ++ if (!leaf_decoder_.TryAdvance()) + continue; + +- if (!payload_reader_.Initialize(leaf_decoder_->last_record_size(), +- leaf_decoder_->last_record_offset())) { ++ if (!payload_reader_.Initialize(leaf_decoder_.last_record_size(), ++ leaf_decoder_.last_record_offset())) { + continue; + } + if (!record_reader_.Initialize()) +@@ -99,13 +99,13 @@ int VirtualCursor::ReadColumn(int column_index, + int64_t VirtualCursor::RowId() { + DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); + DCHECK(record_reader_.IsInitialized()); +- DCHECK(leaf_decoder_.get()); +- return leaf_decoder_->last_record_rowid(); ++ DCHECK(leaf_decoder_.IsValid()); ++ return leaf_decoder_.last_record_rowid(); + } + + void VirtualCursor::AppendPageDecoder(int page_id) { + DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); +- DCHECK(leaf_decoder_.get() == nullptr) ++ DCHECK(!leaf_decoder_.IsValid()) + << __func__ + << " must only be called when the current path has no leaf decoder"; + +@@ -113,7 +113,7 @@ void VirtualCursor::AppendPageDecoder(int page_id) { + return; + + if (LeafPageDecoder::IsOnValidPage(&db_reader_)) { +- leaf_decoder_ = std::make_unique<LeafPageDecoder>(&db_reader_); ++ leaf_decoder_.Initialize(&db_reader_); + return; + } + +diff --git a/sql/recover_module/cursor.h b/sql/recover_module/cursor.h +index afcd6900e1..b15c31d425 100644 +--- a/sql/recover_module/cursor.h ++++ b/sql/recover_module/cursor.h +@@ -129,7 +129,7 @@ class VirtualCursor { + std::vector<std::unique_ptr<InnerPageDecoder>> inner_decoders_; + + // Decodes the leaf page containing records. +- std::unique_ptr<LeafPageDecoder> leaf_decoder_; ++ LeafPageDecoder leaf_decoder_; + + SEQUENCE_CHECKER(sequence_checker_); + }; +diff --git a/sql/recover_module/pager.cc b/sql/recover_module/pager.cc +index 58e75de270..5fe96204e5 100644 +--- a/sql/recover_module/pager.cc ++++ b/sql/recover_module/pager.cc +@@ -23,8 +23,7 @@ static_assert(DatabasePageReader::kMaxPageId <= std::numeric_limits<int>::max(), + "ints are not appropriate for representing page IDs"); + + DatabasePageReader::DatabasePageReader(VirtualTable* table) +- : page_data_(std::make_unique<uint8_t[]>(table->page_size())), +- table_(table) { ++ : page_data_(), table_(table) { + DCHECK(table != nullptr); + DCHECK(IsValidPageSize(table->page_size())); + } +@@ -57,8 +56,8 @@ int DatabasePageReader::ReadPage(int page_id) { + std::numeric_limits<int64_t>::max(), + "The |read_offset| computation above may overflow"); + +- int sqlite_status = +- RawRead(sqlite_file, read_size, read_offset, page_data_.get()); ++ int sqlite_status = RawRead(sqlite_file, read_size, read_offset, ++ const_cast<uint8_t*>(page_data_.data())); + + // |page_id_| needs to be set to kInvalidPageId if the read failed. + // Otherwise, future ReadPage() calls with the previous |page_id_| value +diff --git a/sql/recover_module/pager.h b/sql/recover_module/pager.h +index 0e388ddc3b..99314e30ff 100644 +--- a/sql/recover_module/pager.h ++++ b/sql/recover_module/pager.h +@@ -5,6 +5,7 @@ + #ifndef SQL_RECOVER_MODULE_PAGER_H_ + #define SQL_RECOVER_MODULE_PAGER_H_ + ++#include <array> + #include <cstdint> + #include <memory> + +@@ -70,7 +71,7 @@ class DatabasePageReader { + DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); + DCHECK_NE(page_id_, kInvalidPageId) + << "Successful ReadPage() required before accessing pager state"; +- return page_data_.get(); ++ return page_data_.data(); + } + + // The number of bytes in the page read by the last ReadPage() call. +@@ -137,7 +138,7 @@ class DatabasePageReader { + int page_id_ = kInvalidPageId; + // Stores the bytes of the last page successfully read by ReadPage(). + // The content is undefined if the last call to ReadPage() did not succeed. +- const std::unique_ptr<uint8_t[]> page_data_; ++ const std::array<uint8_t, kMaxPageSize> page_data_; + // Raw pointer usage is acceptable because this instance's owner is expected + // to ensure that the VirtualTable outlives this. + VirtualTable* const table_; |