Adrian Prantl 02474a32eb Move the complex address expression out of DIVariable and into an extra ... argument of the llvm.dbg.declare/llvm.dbg.value intrinsics. Previously, DIVariable was a variable-length field that has an optional reference to a Metadata array consisting of a variable number of complex address expressions. In the case of OpPiece expressions this is wasting a lot of storage in IR, because when an aggregate type is, e.g., SROA'd into all of its n individual members, the IR will contain n copies of the DIVariable, all alike, only differing in the complex address reference at the end. By making the complex address into an extra argument of the dbg.value/dbg.declare intrinsics, all of the pieces can reference the same variable and the complex address expressions can be uniqued across the CU, too. Down the road, this will allow us to move other flags, such as "indirection" out of the DIVariable, too. The new intrinsics look like this: declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr) declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr) This patch adds a new LLVM-local tag to DIExpressions, so we can detect and pretty-print DIExpression metadata nodes. What this patch doesn't do: This patch does not touch the "Indirect" field in DIVariable; but moving that into the expression would be a natural next step. http://reviews.llvm.org/D4919 rdar://problem/17994491 Thanks to dblaikie and dexonsmith for reviewing this patch! Note: I accidentally committed a bogus older version of this patch previously. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8		2014-10-01 18:55:02 +00:00
..
ADT	Add an immovable type to test Optional<T>::emplace more rigorously after r218732.	2014-10-01 18:29:44 +00:00
Analysis	Modernize the .ll parsing interface.	2014-08-19 16:58:54 +00:00
Bitcode	Do not destroy external linkage when deleting function body	2014-09-23 12:54:19 +00:00
CodeGen	DIE: Pass ownership of children via std::unique_ptr rather than raw pointer.	2014-04-25 20:00:34 +00:00
DebugInfo
ExecutionEngine	[MCJIT] Turn the getSymbolAddress free function created in r218626 into a static	2014-10-01 04:11:13 +00:00
IR	Add doInitialization/doFinalization to DataLayoutPass.	2014-09-10 21:27:43 +00:00
LineEditor	[CMake] LineEditorTests: Add Support to link_components.	2014-07-24 11:44:33 +00:00
Linker	[C++11] Use 'nullptr'.	2014-06-08 22:29:17 +00:00
MC	WinCOFFObjectWriter: optimize the string table for common suffices	2014-09-29 22:43:20 +00:00
Option	Retire llvm::array_endof in favor of non-member std::end.	2014-04-12 16:15:53 +00:00
Support	[Support] Add type-safe alternative to llvm::format()	2014-09-25 20:30:58 +00:00
Transforms	Move the complex address expression out of DIVariable and into an extra	2014-10-01 18:55:02 +00:00
CMakeLists.txt	Invert the MC -> Object dependency.	2014-07-03 02:01:39 +00:00
Makefile	Invert the MC -> Object dependency.	2014-07-03 02:01:39 +00:00
Makefile.unittest