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# fb00c887 21-Feb-2014 Warren Hunt <[email protected]>

Complete Rewrite of CGRecordLayoutBuilder

CGRecordLayoutBuilder was aging, complex, multi-pass, and shows signs of
existing before ASTRecordLayoutBuilder. It redundantly performed many
layout ope

Complete Rewrite of CGRecordLayoutBuilder

CGRecordLayoutBuilder was aging, complex, multi-pass, and shows signs of
existing before ASTRecordLayoutBuilder. It redundantly performed many
layout operations that are now performed by ASTRecordLayoutBuilder and
asserted that the results were the same. With the addition of support
for the MS-ABI, such as placement of vbptrs, vtordisps, different
bitfield layout and a variety of other features, CGRecordLayoutBuilder
was growing unwieldy in its redundancy.

This patch re-architects CGRecordLayoutBuilder to not perform any
redundant layout but rather, as directly as possible, lower an
ASTRecordLayout to an llvm::type. The new architecture is significantly
smaller and simpler than the CGRecordLayoutBuilder and contains fewer
ABI-specific code paths. It's also one pass.

The architecture of the new system is described in the comments. For the
most part, the new system simply takes all of the fields and bases from
an ASTRecordLayout, sorts them, inserts padding and dumps a record.
Bitfields, unions and primary virtual bases make this process a bit more
complicated. See the inline comments.

In addition, this patch updates a few lit tests due to the fact that the
new system computes more accurate llvm types than CGRecordLayoutBuilder.
Each change is commented individually in the review.

Differential Revision: http://llvm-reviews.chandlerc.com/D2795

llvm-svn: 201907

show more ...


Revision tags: llvmorg-3.4.0, llvmorg-3.4.0-rc3, llvmorg-3.4.0-rc2, llvmorg-3.4.0-rc1, llvmorg-3.3.1-rc1, llvmorg-3.3.0, llvmorg-3.3.0-rc3, llvmorg-3.3.0-rc2, llvmorg-3.3.0-rc1, llvmorg-3.2.0, llvmorg-3.2.0-rc3, llvmorg-3.2.0-rc2, llvmorg-3.2.0-rc1, llvmorg-3.1.0, llvmorg-3.1.0-rc3, llvmorg-3.1.0-rc2, llvmorg-3.1.0-rc1, llvmorg-3.0.0, llvmorg-3.0.0-rc4, llvmorg-3.0.0-rc3, llvmorg-3.0.0-rc2, llvmorg-3.0.0-rc1
# 085095f1 26-Sep-2011 Peter Collingbourne <[email protected]>

Move vtable dumper call to VTableBuilder ctor

llvm-svn: 140508
Revision tags: llvmorg-2.9.0, llvmorg-2.9.0-rc3, llvmorg-2.9.0-rc2, llvmorg-2.9.0-rc1, llvmorg-2.8.0, llvmorg-2.8.0-rc3, llvmorg-2.8.0-rc2, llvmorg-2.8.0-rc1, llvmorg-2.8.0-rc0, llvmorg-2.7.0
# 151b062f 25-Mar-2010 Anders Carlsson <[email protected]>

Don't add address points for virtual primary bases that aren't primary bases in the complete class.

llvm-svn: 99555
# ca82a4fd 10-Mar-2010 Anders Carlsson <[email protected]>

Improve vcall offset handling in construction vtables. With this we layout the construction vtables from the ABI examples correctly.

llvm-svn: 98127
# 4d0729a7 27-Feb-2010 Anders Carlsson <[email protected]>

Figured out why the test was failing, this will hopefully fix it.

llvm-svn: 97336
# ec27c49d 27-Feb-2010 Anders Carlsson <[email protected]>

XFAIL this for now. I have no idea why this test is failing on some machines. Looks like some sort of whitespace issue in FileCheck.

llvm-svn: 97332
# a9f633b0 24-Feb-2010 Anders Carlsson <[email protected]>

Generate correct vcall offsets when we have a primary virtual base that is not a primary base in the complete class hierarchy.

llvm-svn: 97039
# 82109508 19-Feb-2010 Anders Carlsson <[email protected]>

Add another test from the ABI spec.

llvm-svn: 96659
# e5faca7c 18-Feb-2010 Anders Carlsson <[email protected]>

Fix another bug and add another class.

llvm-svn: 96590
# aa7444cd 18-Feb-2010 Anders Carlsson <[email protected]>

Add another class from cxx-vtable-ex.html

llvm-svn: 96588
# 8847d9e4 18-Feb-2010 Anders Carlsson <[email protected]>

More work on vcall offsets.

llvm-svn: 96587
# 664b7d02 18-Feb-2010 Anders Carlsson <[email protected]>

Add tests from the Itanium C++ ABI spec.

llvm-svn: 96586