diff options
author | Samuel Huang <huangs@chromium.org> | 2018-03-13 18:19:34 +0000 |
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committer | Edward Lesmes <ehmaldonado@google.com> | 2021-07-23 21:50:59 +0000 |
commit | 06f1ae9aaca969ee95ef840f22b6b461c304542d (patch) | |
tree | f1e5c6624e70628e81fbf38d6cd14b974abe5d93 /image_index.cc | |
download | zucchini-06f1ae9aaca969ee95ef840f22b6b461c304542d.tar.gz |
[Zucchini] Move Zucchini from /chrome/installer/ to /components/.
(Use "git log --follow" to see older revisions of files).
/components/ is the most logical place to put Zucchini, which only
depends on /base and /testing/gtest. This move also enables Zucchini to
be used by the Component Updater. Details:
- Move all files; run the following to change deps and guards:
sed 's/chrome\/installer/components/' *.cc *.h -i
sed 's/CHROME_INSTALLER/COMPONENTS/' *.cc *.h -i
- Sorting works out pretty well!
- Change all 'chrome/installer/zucchini' to 'components/zucchini'
throughout other parts of the repo; sort if necessary.
- Fix 6 'git cl lint' errors.
- Change 1 Bind() usage to BindRepeated().
- Update OWNER.
Bug: 729154
Change-Id: I50c5a7d411ea85f707b5994ab319dfb2a1acccf7
Reviewed-on: https://chromium-review.googlesource.com/954923
Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542857}
NOKEYCHECK=True
GitOrigin-RevId: 577ef6c435e8d43be6e3e60ccbcbd1881780f4ec
Diffstat (limited to 'image_index.cc')
-rw-r--r-- | image_index.cc | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/image_index.cc b/image_index.cc new file mode 100644 index 0000000..6c7a28b --- /dev/null +++ b/image_index.cc @@ -0,0 +1,78 @@ +// Copyright 2017 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "components/zucchini/image_index.h" + +#include <algorithm> +#include <utility> + +#include "components/zucchini/algorithm.h" +#include "components/zucchini/disassembler.h" + +namespace zucchini { + +ImageIndex::ImageIndex(ConstBufferView image) + : image_(image), type_tags_(image.size(), kNoTypeTag) {} + +ImageIndex::ImageIndex(ImageIndex&&) = default; + +ImageIndex::~ImageIndex() = default; + +bool ImageIndex::Initialize(Disassembler* disasm) { + std::vector<ReferenceGroup> ref_groups = disasm->MakeReferenceGroups(); + for (const auto& group : ref_groups) { + // Build pool-to-type mapping. + DCHECK_NE(kNoPoolTag, group.pool_tag()); + TargetPool& target_pool = target_pools_[group.pool_tag()]; + target_pool.AddType(group.type_tag()); + target_pool.InsertTargets(std::move(*group.GetReader(disasm))); + } + for (const auto& group : ref_groups) { + // Find and store all references for each type, returns false on finding + // any overlap, to signal error. + if (!InsertReferences(group.traits(), + std::move(*group.GetReader(disasm)))) { + return false; + } + } + return true; +} + +bool ImageIndex::IsToken(offset_t location) const { + TypeTag type = LookupType(location); + + // |location| points into raw data. + if (type == kNoTypeTag) + return true; + + // |location| points into a Reference. + IndirectReference reference = refs(type).at(location); + // Only the first byte of a reference is a token. + return location == reference.location; +} + +bool ImageIndex::InsertReferences(const ReferenceTypeTraits& traits, + ReferenceReader&& ref_reader) { + // Store ReferenceSet for current type (of |group|). + DCHECK_NE(kNoTypeTag, traits.type_tag); + auto result = reference_sets_.emplace( + traits.type_tag, ReferenceSet(traits, pool(traits.pool_tag))); + DCHECK(result.second); + + result.first->second.InitReferences(std::move(ref_reader)); + for (auto ref : reference_sets_.at(traits.type_tag)) { + DCHECK(RangeIsBounded(ref.location, traits.width, size())); + auto cur_type_tag = type_tags_.begin() + ref.location; + + // Check for overlap with existing reference. If found, then invalidate. + if (std::any_of(cur_type_tag, cur_type_tag + traits.width, + [](TypeTag type) { return type != kNoTypeTag; })) { + return false; + } + std::fill(cur_type_tag, cur_type_tag + traits.width, traits.type_tag); + } + return true; +} + +} // namespace zucchini |