[llvm-branch-commits] [llvm] b6c3a59 - [AMDGPU] Test case demonstrating issues with generation of .debug_frame

[via llvm-branch-commits]

Author: RamNalamothu
Date: 2021-01-22T07:39:06+05:30
New Revision: b6c3a59c3f550ab9214de3988419fe1cb68679c9

URL: https://github.com/llvm/llvm-project/commit/b6c3a59c3f550ab9214de3988419fe1cb68679c9
DIFF: https://github.com/llvm/llvm-project/commit/b6c3a59c3f550ab9214de3988419fe1cb68679c9.diff

LOG: [AMDGPU] Test case demonstrating issues with generation of .debug_frame

This test case demonstrates that the Call Frame Information generation is
totally biased towards whether exceptions are enabled or not. Currently
LLVM does not generate CFI i.e. a .debug_frame for debug purpose even
if --force-dwarf-frame-section is enabled unless exceptions are enabled.

Reviewed By: scott.linder

Differential Revision: https://reviews.llvm.org/D94801

Added: 
    llvm/test/CodeGen/AMDGPU/debug_frame.ll

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/llvm/test/CodeGen/AMDGPU/debug_frame.ll b/llvm/test/CodeGen/AMDGPU/debug_frame.ll
new file mode 100644
index 000000000000..7775b70081ae
--- /dev/null
+++ b/llvm/test/CodeGen/AMDGPU/debug_frame.ll
@@ -0,0 +1,28 @@
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=NOEXCEPTIONS_NOFORCE-DEBUG %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj --force-dwarf-frame-section -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=NOEXCEPTIONS_FORCE-DEBUG %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj --exception-model=dwarf -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=EXCEPTIONS_NOFORCE-DEBUG %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -filetype=obj --force-dwarf-frame-section --exception-model=dwarf -o - < %s | llvm-readelf -S - | FileCheck --check-prefixes=EXCEPTIONS_FORCE-DEBUG %s
+
+; Test that demonstrates we produce a .debug_frame only when exceptions are enabled even if --force-dwarf-frame-section is enabled
+
+; NOEXCEPTIONS_NOFORCE-DEBUG-NOT: .debug_frame
+; NOEXCEPTIONS_FORCE-DEBUG-NOT: .debug_frame
+; EXCEPTIONS_NOFORCE-DEBUG: .debug_frame
+; EXCEPTIONS_FORCE-DEBUG: .debug_frame
+
+define void @f() nounwind !dbg !0 {
+entry:
+  ret void
+}
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7}
+!5 = !{!0}
+
+!0 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, scopeLine: 1, file: !6, scope: !1, type: !3)
+!1 = !DIFile(filename: "/home/espindola/llvm/test.c", directory: "/home/espindola/llvm/build")
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.0 ()", isOptimized: true, emissionKind: FullDebug, file: !6, enums: !{}, retainedTypes: !{})
+!3 = !DISubroutineType(types: !4)
+!4 = !{null}
+!6 = !DIFile(filename: "/home/espindola/llvm/test.c", directory: "/home/espindola/llvm/build")
+!7 = !{i32 1, !"Debug Info Version", i32 3}