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Zachary Turner 4202759d3b [CodeView] Refactor / Rewrite TypeSerializer and TypeTableBuilder. 
The motivation behind this patch is that future directions require us to
be able to compute the hash value of records independently of actually
using them for de-duplication.

The current structure of TypeSerializer / TypeTableBuilder being a
single entry point that takes an unserialized type record, and then
hashes and de-duplicates it is not flexible enough to allow this.

At the same time, the existing TypeSerializer is already extremely
complex for this very reason -- it tries to be too many things. In
addition to serializing, hashing, and de-duplicating, ti also supports
splitting up field list records and adding continuations. All of this
functionality crammed into this one class makes it very complicated to
work with and hard to maintain.

To solve all of these problems, I've re-written everything from scratch
and split the functionality into separate pieces that can easily be
reused. The end result is that one class TypeSerializer is turned into 3
new classes SimpleTypeSerializer, ContinuationRecordBuilder, and
TypeTableBuilder, each of which in isolation is simple and
straightforward.

A quick summary of these new classes and their responsibilities are:

- SimpleTypeSerializer : Turns a non-FieldList leaf type into a series of
  bytes. Does not do any hashing. Every time you call it, it will
  re-serialize and return bytes again. The same instance can be re-used
  over and over to avoid re-allocations, and in exchange for this
  optimization the bytes returned by the serializer only live until the
  caller attempts to serialize a new record.

- ContinuationRecordBuilder : Turns a FieldList-like record into a series
  of fragments. Does not do any hashing. Like SimpleTypeSerializer,
  returns references to privately owned bytes, so the storage is
  invalidated as soon as the caller tries to re-use the instance. Works
  equally well for LF_FIELDLIST as it does for LF_METHODLIST, solving a
  long-standing theoretical limitation of the previous implementation.

- TypeTableBuilder : Accepts sequences of bytes that the user has already
  serialized, and inserts them by de-duplicating with a hash table. For
  the sake of convenience and efficiency, this class internally stores a
  SimpleTypeSerializer so that it can accept unserialized records. The
  same is not true of ContinuationRecordBuilder. The user is required to
  create their own instance of ContinuationRecordBuilder.

Differential Revision: https://reviews.llvm.org/D40518

llvm-svn: 319198
2017-11-28 18:33:17 +00:00
..
AArch64 Preserve debug info when DAG-combinging (zext (truncate x)) -> (and x, mask). 2017-11-09 19:50:20 +00:00
AMDGPU Re-land "[llvm-dwarfdump] Print type names in DW_AT_type DIEs" 2017-10-10 14:15:25 +00:00
ARM [CodeGen] Print register names in lowercase in both MIR and debug output 2017-11-28 17:15:09 +00:00
COFF [CodeView] Refactor / Rewrite TypeSerializer and TypeTableBuilder. 2017-11-28 18:33:17 +00:00
Generic SROA: Avoid creating a fragment expression that covers the entire variable. 2017-11-28 00:57:53 +00:00
Inputs [DwarfDump] -debug-line=offset applies to .dwo too. 2017-11-22 18:23:55 +00:00
Lanai
Mips [dwarfdump] Add verbose output for .debug-line section 2017-09-21 20:15:30 +00:00
MIR [CodeGen] Print register names in lowercase in both MIR and debug output 2017-11-28 17:15:09 +00:00
MSP430 Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
PDB [PDB] Handle an empty globals hash table with no buckets 2017-10-27 00:45:51 +00:00
PowerPC Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
Sparc llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
SystemZ llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
WebAssembly [WebAssembly] Update debug info test after r312144 2017-08-30 19:54:08 +00:00
X86 [CodeGen] Print register names in lowercase in both MIR and debug output 2017-11-28 17:15:09 +00:00
arm-relocs.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
cross-cu-scope.ll [DebugInfo] Fix potential CU mismatch for SubprogramScopeDIEs. 2017-11-15 10:57:05 +00:00
debuglineinfo-macho.test
debuglineinfo.test
debugmacinfo.test llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
dwarfdump-64-bit-dwarf.test [DebugInfo] Dump a .debug_line section, including line-number program, 2017-11-22 15:48:30 +00:00
dwarfdump-accel.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwarfdump-debug-frame-simple.test [dwarfdump] Make .eh_frame an alias for .debug_frame 2017-09-18 14:15:57 +00:00
dwarfdump-decompression-corrupt.test [Object] Verify object sizes before handing out StringRefs pointing out 2017-08-31 12:27:10 +00:00
dwarfdump-decompression-error.test
dwarfdump-dump-flags.test llvm-dwarfdump: automatically dump both regular and .dwo variant of sections 2017-09-13 22:09:01 +00:00
dwarfdump-dump-gdbindex.test llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
dwarfdump-dwp.test llvm-dwarfdump: automatically dump both regular and .dwo variant of sections 2017-09-13 22:09:01 +00:00
dwarfdump-implicit-const.test llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
dwarfdump-invalid.test
dwarfdump-macho-relocs.test llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
dwarfdump-macho-universal.test Adapt more testcases for llvm-dwarfdump changes. 2017-09-14 17:27:03 +00:00
dwarfdump-objc.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwarfdump-pubnames.test llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
dwarfdump-ranges.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwarfdump-str-offsets-dwp.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwarfdump-str-offsets-invalid.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwarfdump-str-offsets.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwarfdump-type-units.test Re-land "[llvm-dwarfdump] Print type names in DW_AT_type DIEs" 2017-10-10 14:15:25 +00:00
dwarfdump-zlib.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
dwo.ll llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
invalid-relocations.test [DWARF] - Add testcase for checking message about broken relocations. 2017-07-11 12:29:07 +00:00
llvm-symbolizer-split-dwarf-empty.test [llvm] Get rid of "%T" expansions 2017-08-15 20:29:24 +00:00
llvm-symbolizer-zlib.test
llvm-symbolizer.test Migrate llvm-symbolizer tests to not use %T 2017-09-08 21:10:01 +00:00
macro_link.ll
member-pointers.o
missing-abstract-variable.o
omit-empty.ll DebugInfo: Consider a CU containing only local imported entities to be 'empty' 2017-07-28 03:06:25 +00:00
pr34186.ll Move the stripping of invalid debug info from the Verifier to AutoUpgrade. 2017-10-02 18:31:29 +00:00
pr34672.ll Move the stripping of invalid debug info from the Verifier to AutoUpgrade. 2017-10-02 18:31:29 +00:00
skeletoncu.ll llvm-dwarfdump: Replace -debug-dump=sect option with individual options. 2017-09-11 22:59:45 +00:00
strip-DIGlobalVariable.ll
strip-loop-metadata.ll
typeunit-header.test llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
unrolled-loop-remainder.ll [LoopUnroll][DebugInfo] Don't add metadata to unrolled remainder loop 2017-09-04 08:12:16 +00:00