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* Revert "[DWARF5][clang]: Added support for DebugInfo generation for auto ↵Sam McCall2020-01-131-3/+2
| | | | | | | | | return type for C++ member functions." This reverts commit 6d6a4590c5d4c7fc7445d72fe685f966b0a8cafb, which introduces a crash. See https://reviews.llvm.org/D70524 for details.
* [DWARF5][clang]: Added support for DebugInfo generation for auto return type ↵Awanish Pandey2020-01-131-2/+3
| | | | | | | | | | | | | | | | | for C++ member functions. Summary: This patch will provide support for auto return type for the C++ member functions. This patch includes clang side implementation of this feature. Patch by: Awanish Pandey <Awanish.Pandey@amd.com> Reviewers: dblaikie, aprantl, shafik, alok, SouraVX, jini.susan.george Reviewed by: dblaikie Differential Revision: https://reviews.llvm.org/D70524
* reland "[DebugInfo] Support to emit debugInfo for extern variables"Yonghong Song2019-12-221-0/+3
| | | | | | | | | | | | | Commit d77ae1552fc21a9f3877f3ed7e13d631f517c825 ("[DebugInfo] Support to emit debugInfo for extern variables") added deebugInfo for extern variables for BPF target. The commit is reverted by 891e25b02d760d0de18c7d46947913b3166047e7 as the committed tests using %clang instead of %clang_cc1 causing test failed in certain scenarios as reported by Reid Kleckner. This patch fixed the tests by using %clang_cc1. Differential Revision: https://reviews.llvm.org/D71818
* Revert "[DebugInfo] Support to emit debugInfo for extern variables"Reid Kleckner2019-12-221-3/+0
| | | | | | | This reverts commit d77ae1552fc21a9f3877f3ed7e13d631f517c825. The tests committed along with this change do not pass, and should be changed to use %clang_cc1.
* [DebugInfo] Support to emit debugInfo for extern variablesYonghong Song2019-12-101-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extern variable usage in BPF is different from traditional pure user space application. Recent discussion in linux bpf mailing list has two use cases where debug info types are required to use extern variables: - extern types are required to have a suitable interface in libbpf (bpf loader) to provide kernel config parameters to bpf programs. https://lore.kernel.org/bpf/CAEf4BzYCNo5GeVGMhp3fhysQ=_axAf=23PtwaZs-yAyafmXC9g@mail.gmail.com/T/#t - extern types are required so kernel bpf verifier can verify program which uses external functions more precisely. This will make later link with actual external function no need to reverify. https://lore.kernel.org/bpf/87eez4odqp.fsf@toke.dk/T/#m8d5c3e87ffe7f2764e02d722cb0d8cbc136880ed This patch added clang support to emit debuginfo for extern variables with a TargetInfo hook to enable it. The debuginfo for the extern variable is emitted only if that extern variable is referenced in the current compilation unit. Currently, only BPF target enables to generate debug info for extern variables. The emission of such debuginfo is disabled for C++ at this moment since BPF only supports a subset of C language. Emission with C++ can be enabled later if an appropriate use case is identified. -fstandalone-debug permits us to see more debuginfo with the cost of bloated binary size. This patch did not add emission of extern variable debug info with -fstandalone-debug. This can be re-evaluated if there is a real need. Differential Revision: https://reviews.llvm.org/D70696
* Debug Info: Apply a default location for cleanups if none is available.Adrian Prantl2019-12-051-0/+1
| | | | | | | | | This unbreaks the debuginfo-tests testsuite by replacing the assertion with a default location. There are cleanups in helper functions that don't have a valid source location such as block copy helpers and it's not worth tracking each of them down. rdar://57630879
* Initial implementation of -fmacro-prefix-map and -ffile-prefix-mapDan McGregor2019-11-261-1/+2
| | | | | | | | | GCC 8 implements -fmacro-prefix-map. Like -fdebug-prefix-map, it replaces a string prefix for the __FILE__ macro. -ffile-prefix-map is the union of -fdebug-prefix-map and -fmacro-prefix-map Reviewed By: rnk, Lekensteyn, maskray Differential Revision: https://reviews.llvm.org/D49466
* Debug info: Emit objc_direct methods as members of their containing classAdrian Prantl2019-11-211-1/+4
| | | | | | | | | even in DWARF 4 and earlier. This allows the debugger to recognize them as direct functions as opposed to Objective-C methods. <rdar://problem/57327663> Differential Revision: https://reviews.llvm.org/D70544
* Reland "[clang] Remove the DIFlagArgumentNotModified debug info flag"Djordje Todorovic2019-11-201-4/+0
| | | | | | | | | | It turns out that the ExprMutationAnalyzer can be very slow when AST gets huge in some cases. The idea is to move this analysis to the LLVM back-end level (more precisely, in the LiveDebugValues pass). The new approach will remove the performance regression, simplify the implementation and give us front-end independent implementation. Differential Revision: https://reviews.llvm.org/D68206
* Revert "[clang] Remove the DIFlagArgumentNotModified debug info flag"Djordje Todorovic2019-11-151-0/+4
| | | | This reverts commit rG1643734741d2 due to LLDB test failure.
* [clang] Remove the DIFlagArgumentNotModified debug info flagDjordje Todorovic2019-11-151-4/+0
| | | | | | | | | | It turns out that the ExprMutationAnalyzer can be very slow when AST gets huge in some cases. The idea is to move this analysis to the LLVM back-end level (more precisely, in the LiveDebugValues pass). The new approach will remove the performance regression, simplify the implementation and give us front-end independent implementation. Differential Revision: https://reviews.llvm.org/D68206
* Debug Info: Nest Objective-C property function decls inside their container.Adrian Prantl2019-11-081-0/+11
| | | | | | | | | | | | | | | | | | This has the nice side-effect of also fixing a crash in Clang. Starting with DWARF 5 we are emitting ObjC method declarations as children of their containing entity. This worked for interfaces, but didn't consider the case of synthessized properties. When a property of a protocol is synthesized in an interface implementation the ObjCMethodDecl that was passed to CGF::StartFunction was the property *declaration* which obviously couldn't have a containing interface. This patch passes the containing interface all the way through to CGDebugInfo, so the function declaration can be created with the correct parent (= the class implementing the protocol). rdar://problem/53782400 Differential Revision: https://reviews.llvm.org/D66121
* Replace std::function in PrintingPolicy with a callbacks object.Richard Smith2019-10-291-0/+12
| | | | | This makes PrintingPolicy significantly more lightweight and provides groundwork for more printing customization hooks.
* Revert "[CGDebugInfo] Simplify EmitFunctionDecl parameters, NFC"Vedant Kumar2019-07-111-5/+4
| | | | | | This reverts commit 1af41074445229fea66b99710a850e5f42ecfa95. llvm-svn: 365814
* [CGDebugInfo] Simplify EmitFunctionDecl parameters, NFCVedant Kumar2019-07-111-4/+5
| | | | | | | | | Replace a `llvm::Function *` parameter with a bool, which seems harder to set to the wrong value by accident. Differential Revision: https://reviews.llvm.org/D64540 llvm-svn: 365809
* [clang] Add DISuprogram and DIE for a func declDjordje Todorovic2019-06-271-1/+9
| | | | | | | | | | | | | | | Attach a unique DISubprogram to a function declaration that will be used for call site debug info. ([7/13] Introduce the debug entry values.) Co-authored-by: Ananth Sowda <asowda@cisco.com> Co-authored-by: Nikola Prica <nikola.prica@rt-rk.com> Co-authored-by: Ivan Baev <ibaev@cisco.com> Differential Revision: https://reviews.llvm.org/D60714 llvm-svn: 364502
* [clang/DIVar] Emit the flag for params that have unmodified valueDjordje Todorovic2019-06-261-0/+4
| | | | | | | | | | | | | | | Emit the debug info flag that indicates that a parameter has unchanged value throughout a function. ([5/13] Introduce the debug entry values.) Co-authored-by: Ananth Sowda <asowda@cisco.com> Co-authored-by: Nikola Prica <nikola.prica@rt-rk.com> Co-authored-by: Ivan Baev <ibaev@cisco.com> Differential Revision: https://reviews.llvm.org/D58035 llvm-svn: 364424
* Store a pointer to the return value in a static alloca and let the debugger ↵Amy Huang2019-06-201-4/+6
| | | | | | | | | | | | | | use that as the variable address for NRVO variables. Subscribers: hiraditya, cfe-commits, llvm-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D63361 llvm-svn: 363952
* [codeview] Fix symbol names for dynamic initializers and atexit stubsReid Kleckner2019-04-241-0/+7
| | | | | | | | | | | | | | | | Summary: Add a new variant to GlobalDecl for these so that we can detect them more easily during debug info emission and handle them appropriately. Reviewers: rsmith, rjmccall, jyu2 Subscribers: aprantl, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D60930 llvm-svn: 359148
* Relanding r357928 with fixed debuginfo check.Amy Huang2019-04-121-0/+4
| | | | | | | | | | | | | [MS] Add metadata for __declspec(allocator) Original summary: Emit !heapallocsite in the metadata for calls to functions marked with __declspec(allocator). Eventually this will be emitted as S_HEAPALLOCSITE debug info in codeview. Differential Revision: https://reviews.llvm.org/D60237 llvm-svn: 358307
* Revert "[MS] Add metadata for __declspec(allocator)"Amy Huang2019-04-081-4/+0
| | | | | | | This reverts commit e7bd735bb03a7b8141e32f7d6cb98e8914d8799e. Reverting because of buildbot failure. llvm-svn: 357952
* [MS] Add metadata for __declspec(allocator)Amy Huang2019-04-081-0/+4
| | | | | | | | | | | | | | | | | Summary: Emit !heapallocsite in the metadata for calls to functions marked with __declspec(allocator). Eventually this will be emitted as S_HEAPALLOCSITE debug info in codeview. Reviewers: rnk Subscribers: jfb, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D60237 llvm-svn: 357928
* Reland r345009 "[DebugInfo] Generate debug information for labels."Hsiangkai Wang2019-01-241-0/+3
| | | | | | | | | | | | | | | | Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. After fixing problems in LiveDebugVariables. After fixing NULL symbol problems in AddressPool when enabling split-dwarf-file. After fixing PR39094. After landing D54199 and D54465 to fix Chromium build failed. Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 352025
* Update the file headers across all of the LLVM projects in the monorepoChandler Carruth2019-01-191-4/+3
| | | | | | | | | | | | | | | | | to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
* Remove CGDebugInfo::getOrCreateFile() and use TheCU->getFile() directly.Adrian Prantl2018-12-111-3/+0
| | | | llvm-svn: 348866
* Reuse code from CGDebugInfo::getOrCreateFile() when creating the fileAdrian Prantl2018-12-111-1/+8
| | | | | | | | | | | | | for the DICompileUnit. This addresses post-commit feedback for D55085. Without this patch, a main source file with an absolute paths may appear in different DIFiles, once with the absolute path and once with the common prefix between the absolute path and the current working directory. Differential Revision: https://reviews.llvm.org/D55519 llvm-svn: 348865
* Move CodeGenOptions from Frontend to BasicRichard Trieu2018-12-111-1/+1
| | | | | | Basic uses CodeGenOptions and should not depend on Frontend. llvm-svn: 348827
* Misc typos fixes in ./lib folderRaphael Isemann2018-12-101-1/+1
| | | | | | | | | | | | | | Summary: Found via `codespell -q 3 -I ../clang-whitelist.txt -L uint,importd,crasher,gonna,cant,ue,ons,orign,ned` Reviewers: teemperor Reviewed By: teemperor Subscribers: teemperor, jholewinski, jvesely, nhaehnle, whisperity, jfb, cfe-commits Differential Revision: https://reviews.llvm.org/D55475 llvm-svn: 348755
* Honor -fdebug-prefix-map when creating function names for the debug info.Adrian Prantl2018-12-051-3/+3
| | | | | | | | | | | | | This adds a callback to PrintingPolicy to allow CGDebugInfo to remap file paths according to -fdebug-prefix-map. Otherwise the debug info (particularly function names for C++ lambdas) may contain paths that should have been remapped in the debug info. <rdar://problem/46128056> Differential Revision: https://reviews.llvm.org/D55137 llvm-svn: 348397
* Revert: Honor -fdebug-prefix-map when creating function names for the debug ↵Renato Golin2018-12-051-3/+3
| | | | | | | | | info. This commit reverts r348060 and r348062 due to it breaking the AArch64 Full buildbot: https://bugs.llvm.org/show_bug.cgi?id=39892 llvm-svn: 348364
* Honor -fdebug-prefix-map when creating function names for the debug info.Adrian Prantl2018-12-011-3/+3
| | | | | | | | | | | | | This adds a callback to PrintingPolicy to allow CGDebugInfo to remap file paths according to -fdebug-prefix-map. Otherwise the debug info (particularly function names for C++ lambdas) may contain paths that should have been remapped in the debug info. <rdar://problem/46128056> Differential Revision: https://reviews.llvm.org/D55137 llvm-svn: 348060
* [OpenCL] Add support of cl_intel_device_side_avc_motion_estimation extensionAndrew Savonichev2018-11-081-0/+3
| | | | | | | | | | | | | | | | | | Summary: Documentation can be found at https://www.khronos.org/registry/OpenCL/extensions/intel/cl_intel_device_side_avc_motion_estimation.txt Patch by Kristina Bessonova Reviewers: Anastasia, yaxunl, shafik Reviewed By: Anastasia Subscribers: arphaman, sidorovd, AlexeySotkin, krisb, bader, asavonic, cfe-commits Differential Revision: https://reviews.llvm.org/D51484 llvm-svn: 346392
* Revert r346326 [OpenCL] Add support of ↵Andrew Savonichev2018-11-071-3/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | cl_intel_device_side_avc_motion_estimation This patch breaks Index/opencl-types.cl LIT test: Script: -- : 'RUN: at line 1'; stage1/bin/c-index-test -test-print-type llvm/tools/clang/test/Index/opencl-types.cl -cl-std=CL2.0 | stage1/bin/FileCheck llvm/tools/clang/test/Index/opencl-types.cl -- Command Output (stderr): -- llvm/tools/clang/test/Index/opencl-types.cl:3:26: warning: unsupported OpenCL extension 'cl_khr_fp16' - ignoring [-Wignored-pragmas] llvm/tools/clang/test/Index/opencl-types.cl:4:26: warning: unsupported OpenCL extension 'cl_khr_fp64' - ignoring [-Wignored-pragmas] llvm/tools/clang/test/Index/opencl-types.cl:8:9: error: use of type 'double' requires cl_khr_fp64 extension to be enabled llvm/tools/clang/test/Index/opencl-types.cl:11:8: error: declaring variable of type 'half' is not allowed llvm/tools/clang/test/Index/opencl-types.cl:15:3: error: use of type 'double' requires cl_khr_fp64 extension to be enabled llvm/tools/clang/test/Index/opencl-types.cl:16:3: error: use of type 'double4' (vector of 4 'double' values) requires cl_khr_fp64 extension to be enabled llvm/tools/clang/test/Index/opencl-types.cl:26:26: warning: unsupported OpenCL extension 'cl_khr_gl_msaa_sharing' - ignoring [-Wignored-pragmas] llvm/tools/clang/test/Index/opencl-types.cl:35:44: error: use of type '__read_only image2d_msaa_t' requires cl_khr_gl_msaa_sharing extension to be enabled llvm/tools/clang/test/Index/opencl-types.cl:36:49: error: use of type '__read_only image2d_array_msaa_t' requires cl_khr_gl_msaa_sharing extension to be enabled llvm/tools/clang/test/Index/opencl-types.cl:37:49: error: use of type '__read_only image2d_msaa_depth_t' requires cl_khr_gl_msaa_sharing extension to be enabled llvm/tools/clang/test/Index/opencl-types.cl:38:54: error: use of type '__read_only image2d_array_msaa_depth_t' requires cl_khr_gl_msaa_sharing extension to be enabled llvm-svn: 346338
* [OpenCL] Add support of cl_intel_device_side_avc_motion_estimation extensionAndrew Savonichev2018-11-071-0/+3
| | | | | | | | | | | | | | | | | | Summary: Documentation can be found at https://www.khronos.org/registry/OpenCL/extensions/intel/cl_intel_device_side_avc_motion_estimation.txt Patch by Kristina Bessonova Reviewers: Anastasia, yaxunl, shafik Reviewed By: Anastasia Subscribers: arphaman, sidorovd, AlexeySotkin, krisb, bader, asavonic, cfe-commits Differential Revision: https://reviews.llvm.org/D51484 llvm-svn: 346326
* Revert r345009 "[DebugInfo] Generate debug information for labels. (After ↵Hans Wennborg2018-10-231-3/+0
| | | | | | | | | | | | | | | | | | | | | fix PR39094)" This broke the Chromium build. See https://bugs.chromium.org/p/chromium/issues/detail?id=898152#c1 for the reproducer. > Generate DILabel metadata and call llvm.dbg.label after label > statement to associate the metadata with the label. > > After fixing PR37395. > After fixing problems in LiveDebugVariables. > After fixing NULL symbol problems in AddressPool when enabling > split-dwarf-file. > After fixing PR39094. > > Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 345026
* [DebugInfo] Generate debug information for labels. (After fix PR39094)Hsiangkai Wang2018-10-231-0/+3
| | | | | | | | | | | | | | | Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. After fixing problems in LiveDebugVariables. After fixing NULL symbol problems in AddressPool when enabling split-dwarf-file. After fixing PR39094. Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 345009
* [DebugInfo] Add support for DWARF5 call site-related attributesVedant Kumar2018-10-051-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | DWARF v5 introduces DW_AT_call_all_calls, a subprogram attribute which indicates that all calls (both regular and tail) within the subprogram have call site entries. The information within these call site entries can be used by a debugger to populate backtraces with synthetic tail call frames. Tail calling frames go missing in backtraces because the frame of the caller is reused by the callee. Call site entries allow a debugger to reconstruct a sequence of (tail) calls which led from one function to another. This improves backtrace quality. There are limitations: tail recursion isn't handled, variables within synthetic frames may not survive to be inspected, etc. This approach is not novel, see: https://gcc.gnu.org/wiki/summit2010?action=AttachFile&do=get&target=jelinek.pdf This patch adds an IR-level flag (DIFlagAllCallsDescribed) which lowers to DW_AT_call_all_calls. It adds the minimal amount of DWARF generation support needed to emit standards-compliant call site entries. For easier deployment, when the debugger tuning is LLDB, the DWARF requirement is adjusted to v4. Testing: Apart from check-{llvm, clang}, I built a stage2 RelWithDebInfo clang binary. Its dSYM passed verification and grew by 1.4% compared to the baseline. 151,879 call site entries were added. rdar://42001377 Differential Revision: https://reviews.llvm.org/D49887 llvm-svn: 343883
* Add template type and value parameter metadata nodes to template variable ↵Matthew Voss2018-10-031-1/+8
| | | | | | | | | | | | | | | | | | specializations Summary: Add an optional attribute referring to a tuple of type and value template parameter nodes to the DIGlobalVariable node. This allows us to record the parameters of template variable specializations. Reviewers: dblaikie, aprantl, probinson, JDevlieghere, clayborg, jingham Reviewed By: JDevlieghere Subscribers: cfe-commits Tags: #debug-info Differential Revision: https://reviews.llvm.org/D52058 llvm-svn: 343707
* Revert "[DebugInfo] Generate debug information for labels."Vitaly Buka2018-09-271-3/+0
| | | | | | | | This reverts commit r343148. It crashes on sanitizer-x86_64-linux-autoconf. llvm-svn: 343183
* [DebugInfo] Generate debug information for labels.Hsiangkai Wang2018-09-261-0/+3
| | | | | | | | | | | | | | Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. After fixing problems in LiveDebugVariables. After fixing NULL symbol problems in AddressPool when enabling split-dwarf-file. Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 343148
* [CodeGen] Revert commit https://reviews.llvm.org/rL342717Calixte Denizet2018-09-241-13/+6
| | | | llvm-svn: 342912
* [CodeGen] Add to emitted DebugLoc information about coverage when it's requiredCalixte Denizet2018-09-211-6/+13
| | | | | | | | | | | | | | | | | | | | Summary: Some lines have a hit counter where they should not have one. Cleanup stuff is located to the last line of the body which is most of the time a '}'. And Exception stuff is added at the beginning of a function and at the end (represented by '{' and '}'). So in such cases, the DebugLoc used in GCOVProfiling.cpp must be marked as not covered. This patch is a followup of https://reviews.llvm.org/D49915. Tests in projects/compiler_rt are fixed by: https://reviews.llvm.org/D49917 Reviewers: marco-c, davidxl Reviewed By: marco-c Subscribers: dblaikie, cfe-commits, sylvestre.ledru Differential Revision: https://reviews.llvm.org/D49916 llvm-svn: 342717
* Remove all uses of DIFlagBlockByrefStructAdrian Prantl2018-09-101-2/+9
| | | | | | | | | | | | This patch removes the last reason why DIFlagBlockByrefStruct from Clang by directly implementing the drilling into the member type done in DwarfDebug::DbgVariable::getType() into the frontend. rdar://problem/31629055 Differential Revision: https://reviews.llvm.org/D51807 llvm-svn: 341842
* Revert "[DebugInfo] Generate debug information for labels. (Fix PR37395)"Sam McCall2018-09-061-3/+0
| | | | | | | | | This reverts commit r341519, which generates debug info that causes backend crashes. (with -split-dwarf-file) Details in https://reviews.llvm.org/D50495 llvm-svn: 341549
* [DebugInfo] Generate debug information for labels. (Fix PR37395)Hsiangkai Wang2018-09-061-0/+3
| | | | | | | | | | | | Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. After fixing problems in LiveDebugVariables. Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 341519
* [DebugInfo][OpenCL] Address post-commit review for r338299Scott Linder2018-08-081-0/+16
| | | | | | | | NFC refactor of code to generate debug info for OpenCL 2.X blocks. Differential Revision: https://reviews.llvm.org/D50099 llvm-svn: 339265
* Revert "[DebugInfo] Generate debug information for labels. (Fix PR37395)"Hsiangkai Wang2018-08-061-3/+0
| | | | | | | | | | | Build failed in http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-autoconf/builds/27258 In lib/CodeGen/LiveDebugVariables.cpp:589, it uses std::prev(MBBI) to get DebugValue's SlotIndex. however, the previous instruction may be also a debug instruction. llvm-svn: 338992
* [DebugInfo] Generate debug information for labels. (Fix PR37395)Hsiangkai Wang2018-08-061-0/+3
| | | | | | | | | | | Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. Differential Revision: https://reviews.llvm.org/D45045 llvm-svn: 338989
* Revert "[DebugInfo] Generate debug information for labels. (Fix PR37395)"Shiva Chen2018-07-241-3/+0
| | | | | | This reverts commit 4288dd3bf082482e02c8a044c611c18168cb0180. llvm-svn: 337803
* [DebugInfo] Generate debug information for labels. (Fix PR37395)Shiva Chen2018-07-241-0/+3
| | | | | | | | | | | | | Generate DILabel metadata and call llvm.dbg.label after label statement to associate the metadata with the label. After fixing PR37395. Differential Revision: https://reviews.llvm.org/D45045 Patch by Hsiangkai Wang. llvm-svn: 337800
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