[PATCH] D134710: [LoongArch] Set correct encodings for DWARF exception handling

[wanglei via Phabricator via llvm-commits]

wangleiat updated this revision to Diff 464548.
wangleiat added a comment.

Address @MaskRay's comment.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134710/new/

https://reviews.llvm.org/D134710

Files:
  llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  llvm/test/CodeGen/LoongArch/dwarf-eh.ll


Index: llvm/test/CodeGen/LoongArch/dwarf-eh.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/LoongArch/dwarf-eh.ll
@@ -0,0 +1,54 @@
+; RUN: llc --mtriple=loongarch32 --relocation-model=static < %s | FileCheck %s
+; RUN: llc --mtriple=loongarch32 --relocation-model=pic < %s | FileCheck %s
+; RUN: llc --mtriple=loongarch64 --relocation-model=static < %s | FileCheck %s
+; RUN: llc --mtriple=loongarch64 --relocation-model=pic < %s | FileCheck %s
+
+declare void @throw_exception()
+
+declare i32 @__gxx_personality_v0(...)
+
+declare ptr @__cxa_begin_catch(ptr)
+
+declare void @__cxa_end_catch()
+
+; CHECK-LABEL: test1:
+; CHECK: .cfi_startproc
+;; PersonalityEncoding = DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4
+; CHECK-NEXT: .cfi_personality 155, DW.ref.__gxx_personality_v0
+;; LSDAEncoding = DW_EH_PE_pcrel | DW_EH_PE_sdata4
+; CHECK-NEXT: .cfi_lsda 27, .Lexception0
+
+define void @test1() personality ptr @__gxx_personality_v0 {
+entry:
+  invoke void @throw_exception() to label %try.cont unwind label %lpad
+
+lpad:
+  %0 = landingpad { ptr, i32 }
+          catch ptr null
+  %1 = extractvalue { ptr, i32 } %0, 0
+  %2 = tail call ptr @__cxa_begin_catch(ptr %1)
+  tail call void @__cxa_end_catch()
+  br label %try.cont
+
+try.cont:
+  ret void
+}
+
+; CHECK-LABEL: GCC_except_table0:
+; CHECK-NEXT: .Lexception0:
+; CHECK-NEXT: .byte 255 # @LPStart Encoding = omit
+;; TTypeEncoding = DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4
+; CHECK-NEXT: .byte 155 # @TType Encoding = indirect pcrel sdata4
+; CHECK: .Lttbaseref0:
+;; CallSiteEncoding = dwarf::DW_EH_PE_uleb128
+; CHECK-NEXT: .byte 1                       # Call site Encoding = uleb128
+; CHECK-NEXT: .uleb128 .Lcst_end0-.Lcst_begin0
+; CHECK-NEXT: .Lcst_begin0:
+; CHECK-NEXT: .uleb128 .Ltmp0-.Lfunc_begin0   # >> Call Site 1 <<
+; CHECK-NEXT: .uleb128 .Ltmp1-.Ltmp0          #   Call between .Ltmp0 and .Ltmp1
+; CHECK-NEXT: .uleb128 .Ltmp2-.Lfunc_begin0   #     jumps to .Ltmp2
+; CHECK-NEXT: .byte 1                       #   On action: 1
+; CHECK-NEXT: .uleb128 .Ltmp1-.Lfunc_begin0   # >> Call Site 2 <<
+; CHECK-NEXT: .uleb128 .Lfunc_end0-.Ltmp1     #   Call between .Ltmp1 and .Lfunc_end0
+; CHECK-NEXT: .byte 0                       #     has no landing pad
+; CHECK-NEXT: .byte 0                       #   On action: cleanup
Index: llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
===================================================================
--- llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -289,6 +289,14 @@
       TTypeEncoding = dwarf::DW_EH_PE_absptr;
     }
     break;
+  case Triple::loongarch32:
+  case Triple::loongarch64:
+    LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
+    PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
+                          dwarf::DW_EH_PE_sdata4;
+    TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
+                    dwarf::DW_EH_PE_sdata4;
+    break;
   default:
     break;
   }


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