[llvm] 730ee65 - [LoongArch] Set correct encodings for DWARF exception handling

[Weining Lu via llvm-commits]

Author: wanglei
Date: 2022-10-08T11:53:48+08:00
New Revision: 730ee6568cf7a1538817a6159c54bb27be76e50e

URL: https://github.com/llvm/llvm-project/commit/730ee6568cf7a1538817a6159c54bb27be76e50e
DIFF: https://github.com/llvm/llvm-project/commit/730ee6568cf7a1538817a6159c54bb27be76e50e.diff

LOG: [LoongArch] Set correct encodings for DWARF exception handling

This patch sets correct encodings for DWARF exception handling for
LoongArch.

Differential Revision: https://reviews.llvm.org/D134710

Added: 
    llvm/test/CodeGen/LoongArch/dwarf-eh.ll

Modified: 
    llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 941e6a2c648e..01f42477ad19 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -289,6 +289,14 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
       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;
   }

diff  --git a/llvm/test/CodeGen/LoongArch/dwarf-eh.ll b/llvm/test/CodeGen/LoongArch/dwarf-eh.ll
new file mode 100644
index 000000000000..f4e347e07de5
--- /dev/null
+++ b/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