If this is a problem for anyone (shared_ptr is two pointers in size,
whereas IntrusiveRefCntPtr is 1 - and the ref count control block that
make_shared adds is probably larger than the one int in RefCountedBase)
I'd prefer to address this by adding a lower-overhead version of
shared_ptr (possibly refactoring IntrusiveRefCntPtr into such a thing)
to avoid the intrusiveness - this allows memory ownership to remain
orthogonal to types and at least to me, seems to make code easier to
understand (since no implicit ownership acquisition can happen).
This recommits 291006, reverted in r291007.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291016 91177308-0d34-0410-b5e6-96231b3b80d8
Breaks Clang's use of bitcode. Reverting until I have a fix to go with
it there.
This reverts commit r291006.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291007 91177308-0d34-0410-b5e6-96231b3b80d8
If this is a problem for anyone (shared_ptr is two pointers in size,
whereas IntrusiveRefCntPtr is 1 - and the ref count control block that
make_shared adds is probably larger than the one int in RefCountedBase)
I'd prefer to address this by adding a lower-overhead version of
shared_ptr (possibly refactoring IntrusiveRefCntPtr into such a thing)
to avoid the intrusiveness - this allows memory ownership to remain
orthogonal to types and at least to me, seems to make code easier to
understand (since no implicit ownership acquisition can happen).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291006 91177308-0d34-0410-b5e6-96231b3b80d8
The assertions were wrong; we need to call getEncodingData() on the element,
not the array. While here, simplify the skipRecord() implementation for Fixed
and Char6 arrays. This is tested by the code I added to llvm-bcanalyzer
which makes sure that we can skip any record.
Differential Revision: https://reviews.llvm.org/D27241
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288315 91177308-0d34-0410-b5e6-96231b3b80d8
The implementation is fairly obvious. This is preparation for using
some blobs in bitcode.
For clarity (and perhaps future-proofing?), I moved the call to
JumpToBit in BitstreamCursor::readRecord ahead of calling
MemoryObject::getPointer, since JumpToBit can theoretically (a) read
bytes, which (b) invalidates the blob pointer.
This isn't strictly necessary the two memory objects we have:
- The return of RawMemoryObject::getPointer is valid until the memory
object is destroyed.
- StreamingMemoryObject::getPointer is valid until the next chunk is
read from the stream. Since the JumpToBit call is only going ahead
to a word boundary, we'll never load another chunk.
However, reordering makes it clear by inspection that the blob returned
by BitstreamCursor::readRecord will be valid.
I added some tests for StreamingMemoryObject::getPointer and
BitstreamCursor::readRecord.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264549 91177308-0d34-0410-b5e6-96231b3b80d8
Add API to SimpleBitstreamCursor to allow users to translate between
byte addresses and pointers.
- jumpToPointer: move the bit position to a particular pointer.
- getPointerToByte: get the pointer for a particular byte.
- getPointerToBit: get the pointer for the byte of the current bit.
- getCurrentByteNo: convenience function for assertions and tests.
Mainly adds unit tests (getPointerToBit/Byte already has a use), but
also preparation for eventually using jumpToPointer.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264546 91177308-0d34-0410-b5e6-96231b3b80d8
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264545 91177308-0d34-0410-b5e6-96231b3b80d8
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264409 91177308-0d34-0410-b5e6-96231b3b80d8
Mehdi Amini
David Blaikie
Peter Collingbourne
Eugene Zelenko
Duncan P. N. Exon Smith
Filipe Cabecinhas
Rafael Espindola