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Adrian Prantl 6825fb64e9 PR32382: Fix emitting complex DWARF expressions. 
The DWARF specification knows 3 kinds of non-empty simple location
descriptions:
1. Register location descriptions
  - describe a variable in a register
  - consist of only a DW_OP_reg
2. Memory location descriptions
  - describe the address of a variable
3. Implicit location descriptions
  - describe the value of a variable
  - end with DW_OP_stack_value & friends

The existing DwarfExpression code is pretty much ignorant of these
restrictions. This used to not matter because we only emitted very
short expressions that we happened to get right by accident.  This
patch makes DwarfExpression aware of the rules defined by the DWARF
standard and now chooses the right kind of location description for
each expression being emitted.

This would have been an NFC commit (for the existing testsuite) if not
for the way that clang describes captured block variables. Based on
how the previous code in LLVM emitted locations, DW_OP_deref
operations that should have come at the end of the expression are put
at its beginning. Fixing this means changing the semantics of
DIExpression, so this patch bumps the version number of DIExpression
and implements a bitcode upgrade.

There are two major changes in this patch:

I had to fix the semantics of dbg.declare for describing function
arguments. After this patch a dbg.declare always takes the *address*
of a variable as the first argument, even if the argument is not an
alloca.

When lowering a DBG_VALUE, the decision of whether to emit a register
location description or a memory location description depends on the
MachineLocation — register machine locations may get promoted to
memory locations based on their DIExpression. (Future) optimization
passes that want to salvage implicit debug location for variables may
do so by appending a DW_OP_stack_value. For example:
  DBG_VALUE, [RBP-8]                        --> DW_OP_fbreg -8
  DBG_VALUE, RAX                            --> DW_OP_reg0 +0
  DBG_VALUE, RAX, DIExpression(DW_OP_deref) --> DW_OP_reg0 +0

All testcases that were modified were regenerated from clang. I also
added source-based testcases for each of these to the debuginfo-tests
repository over the last week to make sure that no synchronized bugs
slip in. The debuginfo-tests compile from source and run the debugger.

https://bugs.llvm.org/show_bug.cgi?id=32382
<rdar://problem/31205000>

Differential Revision: https://reviews.llvm.org/D31439

llvm-svn: 300522
 		2017-04-18 01:21:53 +00:00
..
Inputs Bitcode: Introduce BitcodeWriter interface. 2016-11-29 20:43:47 +00:00
2006-12-11-Cast-ConstExpr.ll
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2009-06-11-FirstClassAggregateConstant.ll
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DICompileUnit-no-DWOId.ll DI: Disallow uniquable DICompileUnits 2015-08-03 17:26:41 +00:00
DICompileUnit-no-DWOId.ll.bc IR / debug info: Add a DWOId field to DICompileUnit, 2015-05-21 20:37:30 +00:00
DIExpression-4.0.ll [DIExpression] Introduce a dedicated DW_OP_LLVM_fragment operation 2016-12-05 18:04:47 +00:00
DIExpression-4.0.ll.bc [DIExpression] Introduce a dedicated DW_OP_LLVM_fragment operation 2016-12-05 18:04:47 +00:00
DIExpression-aggresult.ll PR32382: Fix emitting complex DWARF expressions. 2017-04-18 01:21:53 +00:00
DIExpression-aggresult.ll.bc PR32382: Fix emitting complex DWARF expressions. 2017-04-18 01:21:53 +00:00
DIExpression-deref.ll PR32382: Fix emitting complex DWARF expressions. 2017-04-18 01:21:53 +00:00
DIExpression-deref.ll.bc PR32382: Fix emitting complex DWARF expressions. 2017-04-18 01:21:53 +00:00
DIGlobalVariableExpression.ll Fix the bitcode upgrade for DIGlobalVariable in a DIImportedEntity context. 2017-02-07 17:35:41 +00:00
DIGlobalVariableExpression.ll.bc Fix the bitcode upgrade for DIGlobalVariable in a DIImportedEntity context. 2017-02-07 17:35:41 +00:00
DIGlobalVariableExpression2.ll Fix bitcode upgrade for DIGlobalVariables with a var: field. 2017-02-08 17:44:43 +00:00
DIGlobalVariableExpression2.ll.bc Fix bitcode upgrade for DIGlobalVariables with a var: field. 2017-02-08 17:44:43 +00:00
DILocalVariable-explicit-tags.ll [Bitcode] Fix + regenerate old test so that it includes a DICompileUnit. 2016-04-12 15:51:23 +00:00
DILocalVariable-explicit-tags.ll.bc [Bitcode] Fix + regenerate old test so that it includes a DICompileUnit. 2016-04-12 15:51:23 +00:00
DINamespace.ll Add DWARF debug info support for C++11 inline namespaces. 2016-11-03 19:42:02 +00:00
DINamespace.ll.bc Add DWARF debug info support for C++11 inline namespaces. 2016-11-03 19:42:02 +00:00
DISubprogram-distinct-definitions.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
DISubprogram-distinct-definitions.ll.bc [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
PR23310.test Fix for PR23310: llvm-dis crashes when trying to upgrade an intrinsic. 2015-07-02 16:22:40 +00:00
aggregateInstructions.3.2.ll
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aggregateInstructions.3.2.ll.bc
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anon-functions.ll Fix PR25101 - Handle anonymous functions without VST entries 2015-10-10 14:18:36 +00:00
arm32_neon_vcnt_upgrade.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
atomic.ll
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attributes-3.3.ll
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attributes-3.3.ll.bc
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attributes.ll Add writeonly IR attribute 2016-07-04 08:01:29 +00:00
auto_upgrade_intrinsics.bc Upgrade TBAA *before* upgrading intrinsics 2016-03-16 23:17:54 +00:00
avr-calling-conventions.ll [AVR] Add calling convention parser tokens 2016-03-03 10:08:02 +00:00
avr-calling-conventions.ll.bc [AVR] Add calling convention parser tokens 2016-03-03 10:08:02 +00:00
binaryFloatInstructions.3.2.ll
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binaryFloatInstructions.3.2.ll.bc
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binaryIntInstructions.3.2.ll
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binaryIntInstructions.3.2.ll.bc
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bitcode-wrapper-header-armv7m.ll [llvm-bcanalyzer] Dump bitcode wrapper header 2016-01-29 05:55:09 +00:00
bitcode-wrapper-header-x86_64.ll [llvm-bcanalyzer] Dump bitcode wrapper header 2016-01-29 05:55:09 +00:00
bitwiseInstructions.3.2.ll
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bitwiseInstructions.3.2.ll.bc
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blockaddress.ll
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calling-conventions.3.2.ll
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calling-conventions.3.2.ll.bc
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case-ranges-3.3.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
case-ranges-3.3.ll.bc
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cmpxchg-upgrade.ll
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cmpxchg-upgrade.ll.bc
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cmpxchg.3.6.ll [opaque pointer type] Encode the pointee type in the bitcode for 'cmpxchg' 2015-04-28 04:30:29 +00:00
cmpxchg.3.6.ll.bc [opaque pointer type] Encode the pointee type in the bitcode for 'cmpxchg' 2015-04-28 04:30:29 +00:00
compatibility-3.6.ll Change the default attributes for llvm.prefetch to inaccessiblemem_or_argmemonly 2017-03-25 20:20:23 +00:00
compatibility-3.6.ll.bc [IR] Limit bits used for CallingConv::ID, update tests 2015-10-27 21:17:06 +00:00
compatibility-3.7.ll Change the default attributes for llvm.prefetch to inaccessiblemem_or_argmemonly 2017-03-25 20:20:23 +00:00
compatibility-3.7.ll.bc [IR] Limit bits used for CallingConv::ID, update tests 2015-10-27 21:17:06 +00:00
compatibility-3.8.ll Change the default attributes for llvm.prefetch to inaccessiblemem_or_argmemonly 2017-03-25 20:20:23 +00:00
compatibility-3.8.ll.bc [Bitcode] Add compatibility test for the 3.8 release 2016-03-16 05:43:03 +00:00
compatibility-3.9.ll Change the default attributes for llvm.prefetch to inaccessiblemem_or_argmemonly 2017-03-25 20:20:23 +00:00
compatibility-3.9.ll.bc [Bitcode] Add compatibility test for the 3.9 release 2016-09-09 17:24:31 +00:00
compatibility-4.0.ll Change the default attributes for llvm.prefetch to inaccessiblemem_or_argmemonly 2017-03-25 20:20:23 +00:00
compatibility-4.0.ll.bc [Bitcode] Add compatibility test for the 4.0 release 2017-03-17 17:53:26 +00:00
compatibility.ll [IR] Add AllowContract to FastMathFlags 2017-03-28 20:11:52 +00:00
constantsTest.3.2.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
constantsTest.3.2.ll.bc
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conversionInstructions.3.2.ll
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conversionInstructions.3.2.ll.bc
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debug-loc-again.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
diglobalvariable-3.8.ll [IR] Remove the DIExpression field from DIGlobalVariable. 2016-12-20 02:09:43 +00:00
diglobalvariable-3.8.ll.bc [IR] Remove the DIExpression field from DIGlobalVariable. 2016-12-20 02:09:43 +00:00
dilocalvariable-3.9.ll DebugInfo: add bitcode upgrade test for alignment 2016-10-26 08:34:19 +00:00
dilocalvariable-3.9.ll.bc DebugInfo: add bitcode upgrade test for alignment 2016-10-26 08:34:19 +00:00
dityperefs-3.8.ll Fix the bitcode upgrade for DIGlobalVariable in a DIImportedEntity context. 2017-02-07 17:35:41 +00:00
dityperefs-3.8.ll.bc BitcodeReader: Fix some holes in upgrade from r267296 2016-04-24 06:52:01 +00:00
drop-debug-info.3.5.ll llvm-dis: Stop crashing when dropping debug info 2015-02-25 01:10:03 +00:00
drop-debug-info.3.5.ll.bc llvm-dis: Stop crashing when dropping debug info 2015-02-25 01:10:03 +00:00
extractelement.ll
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fcmp-fast.ll Add support for fast-math flags to the FCmp instruction. 2015-07-10 12:52:00 +00:00
flags.ll
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function-encoding-rel-operands.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
function-local-metadata.3.5.ll
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function-local-metadata.3.5.ll.bc
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global-variables.3.2.ll
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global-variables.3.2.ll.bc
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highLevelStructure.3.2.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
highLevelStructure.3.2.ll.bc
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identification.ll Add an (optional) identification block in the bitcode 2015-10-26 18:37:00 +00:00
inalloca.ll
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invalid.ll Add writeonly IR attribute 2016-07-04 08:01:29 +00:00
invalid.ll.bc Add writeonly IR attribute 2016-07-04 08:01:29 +00:00
invalid.test Bitcode: Introduce initial multi-module reader API. 2016-11-16 21:44:45 +00:00
linkage-types-3.2.ll Bring r226038 back. 2015-01-19 15:16:06 +00:00
linkage-types-3.2.ll.bc
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local-linkage-default-visibility.3.4.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
local-linkage-default-visibility.3.4.ll.bc
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mdnodes-distinct-in-post-order.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdnodes-distinct-nodes-break-cycles.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdnodes-distinct-nodes-first.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdnodes-in-post-order.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdstring-high-bits.ll
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memInstructions.3.2.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
memInstructions.3.2.ll.bc
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metadata-2.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
metadata-function-blocks.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
metadata-only-empty-string.ll BitcodeReader: Allow METADATA_STRINGS to only have !"" 2016-03-29 05:25:17 +00:00
metadata-strings.ll Reapply ~"Bitcode: Collect all MDString records into a single blob" 2016-03-27 23:17:54 +00:00
metadata.3.5.ll
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metadata.3.5.ll.bc
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metadata.ll
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miscInstructions.3.2.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
miscInstructions.3.2.ll.bc
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module_hash.ll Move summary creation out of llvm-as into opt 2016-04-12 21:35:18 +00:00
multi-module.ll Bitcode: Add a more comprehensive multi-module test now that we have both llvm-cat and llvm-modextract. 2016-11-29 21:55:09 +00:00
null-type.ll Bitcode: Introduce initial multi-module reader API. 2016-11-16 21:44:45 +00:00
null-type.ll.bc
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old-aliases.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
old-aliases.ll.bc
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operand-bundles-bc-analyzer.ll Symbolize operand bundle blocks for bcanalyzer 2016-04-26 05:59:08 +00:00
operand-bundles.ll [Bitcode][Asm] Teach LLVM to read and write operand bundles. 2015-09-24 23:34:52 +00:00
padding.test Improve handling of end of file in the bitcode reader. 2015-06-16 20:03:39 +00:00
pr18704.ll llvm-dis: Stop crashing when dropping debug info 2015-02-25 01:10:03 +00:00
pr18704.ll.bc
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ptest-new.ll
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ptest-old.ll
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select.ll [BitcodeReader] Ensure we can read constant vector selects with an i1 condition 2015-08-31 18:00:30 +00:00
shuffle.ll
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source-filename.test Restore "[ThinLTO] Use MD5 hash in function index." with fix 2016-02-10 21:55:02 +00:00
ssse3_palignr.ll
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standardCIntrinsic.3.2.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
standardCIntrinsic.3.2.ll.bc
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summary_version.ll [ThinLTO] Subsume all importing checks into a single flag 2017-01-05 14:32:16 +00:00
tailcall.ll [IR] Limit bits used for CallingConv::ID, update tests 2015-10-27 21:17:06 +00:00
terminatorInstructions.3.2.ll
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terminatorInstructions.3.2.ll.bc
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thinlto-alias.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-alias2.ll [ThinLTO] Record calls to aliases 2016-10-08 16:11:42 +00:00
thinlto-empty-summary-section.ll [ThinLTO] Always emit a summary when compiling in ThinLTO mode 2016-09-20 23:07:17 +00:00
thinlto-function-summary-callgraph-pgo.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-function-summary-callgraph-profile-summary.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-function-summary-callgraph.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-function-summary-originalnames.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-function-summary-refgraph.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-function-summary.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-summary-globalvar.ll [PM] Port ModuleSummaryIndex analysis to new pass manager 2016-08-12 13:53:02 +00:00
thinlto-summary-linkage-types.ll [ThinLTO] Use valueid instead of bitcode offsets in combined index file 2016-04-27 13:28:35 +00:00
thinlto-summary-section.ll [ThinLTO] Subsume all importing checks into a single flag 2017-01-05 14:32:16 +00:00
thinlto-type-tests.ll IR: Function summary representation for type tests. 2016-12-21 23:03:45 +00:00
thinlto-type-vcalls.ll IR: Function summary extensions for whole-program devirtualization pass. 2017-02-10 22:29:38 +00:00
thinlto-unused-type-tests.ll IR: Function summary representation for type tests. 2016-12-21 23:03:45 +00:00
upgrade-debug-info-for-profiling.ll Change debug-info-for-profiling from a TargetOption to a function attribute. 2017-02-01 22:45:09 +00:00
upgrade-debug-info-for-profiling.ll.bc Change debug-info-for-profiling from a TargetOption to a function attribute. 2017-02-01 22:45:09 +00:00
upgrade-global-ctors.ll
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upgrade-global-ctors.ll.bc
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upgrade-loop-metadata.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
upgrade-loop-metadata.ll.bc
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upgrade-module-flag.ll Fix autoupgrade logic for Objective-C class properties module flag 2016-09-16 00:38:18 +00:00
upgrade-pointer-address-space.ll [DebugInfo] Emit address space with DW_AT_address_class attribute for pointer and reference types 2017-03-08 23:55:44 +00:00
upgrade-pointer-address-space.ll.bc [DebugInfo] Emit address space with DW_AT_address_class attribute for pointer and reference types 2017-03-08 23:55:44 +00:00
upgrade-subprogram-this.ll [codeview] Add DISubprogram::ThisAdjustment 2016-07-01 02:41:21 +00:00
upgrade-subprogram-this.ll.bc [codeview] Add DISubprogram::ThisAdjustment 2016-07-01 02:41:21 +00:00
upgrade-subprogram.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
upgrade-subprogram.ll.bc DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
upgrade-tbaa.ll
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use-list-order.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
use-list-order2.ll [Bitcode] Add xfail test for PR24755 (uselistorder) 2015-09-10 16:02:24 +00:00
variableArgumentIntrinsic.3.2.ll
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variableArgumentIntrinsic.3.2.ll.bc
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vectorInstructions.3.2.ll
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vectorInstructions.3.2.ll.bc
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visibility-styles.3.2.ll
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visibility-styles.3.2.ll.bc
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vst-forward-declaration.ll Restore "Function bitcode index in Value Symbol Table and lazy reading support" 2015-09-17 20:12:00 +00:00
weak-cmpxchg-upgrade.ll
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weak-cmpxchg-upgrade.ll.bc
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weak-macho-3.5.ll Bitcode: Don't create comdats when autoupgrading macho bitcode 2015-01-20 05:58:07 +00:00
weak-macho-3.5.ll.bc Bitcode: Don't create comdats when autoupgrading macho bitcode 2015-01-20 05:58:07 +00:00