Split out SimpleBitstreamCursor from BitstreamCursor, which is a
lower-level cursor with no knowledge of bitcode blocks, abbreviations,
or records. It just knows how to read bits and navigate the stream.
This is mainly organizational, to separate the API for manipulating raw
bits from that for bitcode concepts like Record and Block.
llvm-svn: 264545
Optimize output of MDStrings in bitcode. This emits them in big blocks
(currently 1024) in a pair of records:
- BULK_STRING_SIZES: the sizes of the strings in the block, and
- BULK_STRING_DATA: a single blob, which is the concatenation of all
the strings.
Inspired by Mehdi's similar patch, http://reviews.llvm.org/D18342, this
should (a) slightly reduce bitcode size, since there is less record
overhead, and (b) greatly improve reading speed, since blobs are super
cheap to deserialize.
I needed to add support for blobs to streaming input to get the test
suite passing.
- StreamingMemoryObject::getPointer reads ahead and returns the
address of the blob.
- To avoid a possible reallocation of StreamingMemoryObject::Bytes,
BitstreamCursor::readRecord needs to move the call to JumpToEnd
forward so that getPointer is the last bitstream operation.
llvm-svn: 264409
Summary: This make readRecord 20% faster, measured on an LTO build
Reviewers: rafael
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D17911
From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 262811
Summary:
Make sure the abbrev operands are valid and that we can read/skip them
afterwards.
Bug found with AFL fuzz.
Reviewers: rafael
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D9030
llvm-svn: 235595
Eventually we can make some of these pass the error along to the caller.
Reports a fatal error if:
We find an invalid abbrev record
We try to get an invalid abbrev number
We can't fill the current word due to an EOF
Fixed an invalid bitcode test to check for output with FileCheck
Bugs found with afl-fuzz
llvm-svn: 226986
This doesn't change the interface or gives additional safety but removes
a ton of retain/release boilerplate.
No functionality change.
llvm-svn: 217778
Previously, BitstreamCursor read an abbreviated record by splatting the
whole thing into a data vector, then extracting and removing the /first/
element. Now, it reads the first element--the record code--separately from
the actual field values.
No (intended) functionality change.
llvm-svn: 181639
Duncan P. N. Exon Smith
Mehdi Amini
Filipe Cabecinhas
Rafael Espindola
David Blaikie
Richard Smith
Reid Kleckner
Benjamin Kramer
Craig Topper
Jordan Rose