[llvm] r354697 - [WebAssembly] Remove unneeded MCSymbolRefExpr variants

Sam Clegg via llvm-commits llvm-commits at lists.llvm.org
Fri Feb 22 16:15:40 PST 2019


Should be fixed in rL354705

On Fri, Feb 22, 2019 at 4:01 PM Richard Trieu <rtrieu at google.com> wrote:
>
> Hi Sam,
>
> I think your change is causing some WebAssembly tests to start failing.
>
> Failing Tests (36):
>     LLVM :: CodeGen/WebAssembly/byval.ll
>     LLVM :: CodeGen/WebAssembly/call.ll
>     LLVM :: CodeGen/WebAssembly/cfg-stackify-eh.ll
>     LLVM :: CodeGen/WebAssembly/cfg-stackify.ll
>     LLVM :: CodeGen/WebAssembly/exception.ll
>     LLVM :: CodeGen/WebAssembly/f16.ll
>     LLVM :: CodeGen/WebAssembly/f32.ll
>     LLVM :: CodeGen/WebAssembly/f64.ll
>     LLVM :: CodeGen/WebAssembly/fast-isel-noreg.ll
>     LLVM :: CodeGen/WebAssembly/frem.ll
>     LLVM :: CodeGen/WebAssembly/function-bitcasts-varargs.ll
>     LLVM :: CodeGen/WebAssembly/function-bitcasts.ll
>     LLVM :: CodeGen/WebAssembly/global.ll
>     LLVM :: CodeGen/WebAssembly/i128.ll
>     LLVM :: CodeGen/WebAssembly/indirect-import.ll
>     LLVM :: CodeGen/WebAssembly/libcalls.ll
>     LLVM :: CodeGen/WebAssembly/lower-em-ehsjlj-options.ll
>     LLVM :: CodeGen/WebAssembly/lower-global-dtors.ll
>     LLVM :: CodeGen/WebAssembly/main-declaration.ll
>     LLVM :: CodeGen/WebAssembly/main-no-args.ll
>     LLVM :: CodeGen/WebAssembly/mem-intrinsics.ll
>     LLVM :: CodeGen/WebAssembly/muloti4.ll
>     LLVM :: CodeGen/WebAssembly/reg-stackify.ll
>     LLVM :: CodeGen/WebAssembly/returned.ll
>     LLVM :: CodeGen/WebAssembly/signext-arg.ll
>     LLVM :: CodeGen/WebAssembly/signext-zeroext.ll
>     LLVM :: CodeGen/WebAssembly/simd.ll
>     LLVM :: CodeGen/WebAssembly/stack-alignment.ll
>     LLVM :: CodeGen/WebAssembly/switch.ll
>     LLVM :: CodeGen/WebAssembly/umulo-128-legalisation-lowering.ll
>     LLVM :: CodeGen/WebAssembly/umulo-i64.ll
>     LLVM :: CodeGen/WebAssembly/unreachable.ll
>     LLVM :: CodeGen/WebAssembly/unsupported-function-bitcasts.ll
>     LLVM :: CodeGen/WebAssembly/unused-argument.ll
>     LLVM :: CodeGen/WebAssembly/userstack.ll
>     LLVM :: CodeGen/WebAssembly/varargs.ll
>
>   Expected Passes    : 29131
>   Expected Failures  : 149
>   Unsupported Tests  : 628
>   Unexpected Failures: 36
>
> Sample failure:
> Output from test CodeGen/WebAssembly/cfg-stackify.ll
> Command Output (stderr):
> --
> /llvm/test/CodeGen/WebAssembly/cfg-stackify.ll:1289:13: error: OPT-NEXT: expected string not found in input
> ; OPT-NEXT: call test15_callee1 at FUNCTION{{$}}
>             ^
> <stdin>:813:2: note: scanning from here
>  call test15_callee1
>  ^
>
> It looks like the expected strings in the test just need to updated in these tests.
>
> Richard
>
> On Fri, Feb 22, 2019 at 2:28 PM Sam Clegg via llvm-commits <llvm-commits at lists.llvm.org> wrote:
>>
>> Author: sbc
>> Date: Fri Feb 22 14:29:34 2019
>> New Revision: 354697
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=354697&view=rev
>> Log:
>> [WebAssembly] Remove unneeded MCSymbolRefExpr variants
>>
>> We record the type of the symbol (event/function/data/global) in the
>> MCWasmSymbol and so it should always be clear how to handle a relocation
>> based on the symbol itself.
>>
>> The exception is a function which still needs the special @TYPEINDEX
>> then the relocation contains the signature rather than the address
>> of the functions.
>>
>> Differential Revision: https://reviews.llvm.org/D58472
>>
>> Modified:
>>     llvm/trunk/include/llvm/MC/MCExpr.h
>>     llvm/trunk/lib/MC/MCExpr.cpp
>>     llvm/trunk/lib/MC/WasmObjectWriter.cpp
>>     llvm/trunk/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
>>     llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
>>     llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.h
>>     llvm/trunk/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
>>     llvm/trunk/test/MC/WebAssembly/annotations.s
>>     llvm/trunk/test/MC/WebAssembly/assembler-binary.ll
>>     llvm/trunk/test/MC/WebAssembly/basic-assembly.s
>>
>> Modified: llvm/trunk/include/llvm/MC/MCExpr.h
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/MC/MCExpr.h?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/include/llvm/MC/MCExpr.h (original)
>> +++ llvm/trunk/include/llvm/MC/MCExpr.h Fri Feb 22 14:29:34 2019
>> @@ -284,10 +284,7 @@ public:
>>      VK_Hexagon_IE,
>>      VK_Hexagon_IE_GOT,
>>
>> -    VK_WebAssembly_FUNCTION, // Function table index, rather than virtual addr
>> -    VK_WebAssembly_GLOBAL,   // Global object index
>> -    VK_WebAssembly_TYPEINDEX,// Type table index
>> -    VK_WebAssembly_EVENT,    // Event index
>> +    VK_WebAssembly_TYPEINDEX,// Reference to a symbol's type (signature)
>>
>>      VK_AMDGPU_GOTPCREL32_LO, // symbol at gotpcrel32@lo
>>      VK_AMDGPU_GOTPCREL32_HI, // symbol at gotpcrel32@hi
>>
>> Modified: llvm/trunk/lib/MC/MCExpr.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCExpr.cpp?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/MC/MCExpr.cpp (original)
>> +++ llvm/trunk/lib/MC/MCExpr.cpp Fri Feb 22 14:29:34 2019
>> @@ -302,10 +302,7 @@ StringRef MCSymbolRefExpr::getVariantKin
>>    case VK_Hexagon_LD_PLT: return "LDPLT";
>>    case VK_Hexagon_IE: return "IE";
>>    case VK_Hexagon_IE_GOT: return "IEGOT";
>> -  case VK_WebAssembly_FUNCTION: return "FUNCTION";
>> -  case VK_WebAssembly_GLOBAL: return "GLOBAL";
>>    case VK_WebAssembly_TYPEINDEX: return "TYPEINDEX";
>> -  case VK_WebAssembly_EVENT: return "EVENT";
>>    case VK_AMDGPU_GOTPCREL32_LO: return "gotpcrel32 at lo";
>>    case VK_AMDGPU_GOTPCREL32_HI: return "gotpcrel32 at hi";
>>    case VK_AMDGPU_REL32_LO: return "rel32 at lo";
>> @@ -418,10 +415,7 @@ MCSymbolRefExpr::getVariantKindForName(S
>>      .Case("lo8", VK_AVR_LO8)
>>      .Case("hi8", VK_AVR_HI8)
>>      .Case("hlo8", VK_AVR_HLO8)
>> -    .Case("function", VK_WebAssembly_FUNCTION)
>> -    .Case("global", VK_WebAssembly_GLOBAL)
>>      .Case("typeindex", VK_WebAssembly_TYPEINDEX)
>> -    .Case("event", VK_WebAssembly_EVENT)
>>      .Case("gotpcrel32 at lo", VK_AMDGPU_GOTPCREL32_LO)
>>      .Case("gotpcrel32 at hi", VK_AMDGPU_GOTPCREL32_HI)
>>      .Case("rel32 at lo", VK_AMDGPU_REL32_LO)
>>
>> Modified: llvm/trunk/lib/MC/WasmObjectWriter.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/WasmObjectWriter.cpp?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/MC/WasmObjectWriter.cpp (original)
>> +++ llvm/trunk/lib/MC/WasmObjectWriter.cpp Fri Feb 22 14:29:34 2019
>> @@ -1557,15 +1557,16 @@ uint64_t WasmObjectWriter::writeObject(M
>>        assert(Fixup.getKind() ==
>>               MCFixup::getKindForSize(is64Bit() ? 8 : 4, false));
>>        const MCExpr *Expr = Fixup.getValue();
>> -      auto *Sym = dyn_cast<MCSymbolRefExpr>(Expr);
>> -      if (!Sym)
>> +      auto *SymRef = dyn_cast<MCSymbolRefExpr>(Expr);
>> +      if (!SymRef)
>>          report_fatal_error("fixups in .init_array should be symbol references");
>> -      if (Sym->getKind() != MCSymbolRefExpr::VK_WebAssembly_FUNCTION)
>> -        report_fatal_error("symbols in .init_array should be for functions");
>> -      if (Sym->getSymbol().getIndex() == InvalidIndex)
>> +      const auto &TargetSym = cast<const MCSymbolWasm>(SymRef->getSymbol());
>> +      if (TargetSym.getIndex() == InvalidIndex)
>>          report_fatal_error("symbols in .init_array should exist in symbtab");
>> +      if (!TargetSym.isFunction())
>> +        report_fatal_error("symbols in .init_array should be for functions");
>>        InitFuncs.push_back(
>> -          std::make_pair(Priority, Sym->getSymbol().getIndex()));
>> +          std::make_pair(Priority, TargetSym.getIndex()));
>>      }
>>    }
>>
>>
>> Modified: llvm/trunk/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp (original)
>> +++ llvm/trunk/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp Fri Feb 22 14:29:34 2019
>> @@ -42,23 +42,8 @@ private:
>>  WebAssemblyWasmObjectWriter::WebAssemblyWasmObjectWriter(bool Is64Bit)
>>      : MCWasmObjectTargetWriter(Is64Bit) {}
>>
>> -// Test whether the given expression computes a function address.
>> -static bool isFunctionExpr(const MCExpr *Expr) {
>> -  if (auto SyExp = dyn_cast<MCSymbolRefExpr>(Expr))
>> -    return cast<MCSymbolWasm>(SyExp->getSymbol()).isFunction();
>> -
>> -  if (auto BinOp = dyn_cast<MCBinaryExpr>(Expr))
>> -    return isFunctionExpr(BinOp->getLHS()) != isFunctionExpr(BinOp->getRHS());
>> -
>> -  if (auto UnOp = dyn_cast<MCUnaryExpr>(Expr))
>> -    return isFunctionExpr(UnOp->getSubExpr());
>> -
>> -  return false;
>> -}
>> -
>> -static bool isFunctionType(const MCValue &Target) {
>> -  const MCSymbolRefExpr *RefA = Target.getSymA();
>> -  return RefA && RefA->getKind() == MCSymbolRefExpr::VK_WebAssembly_TYPEINDEX;
>> +static bool isFunctionSignatureRef(const MCSymbolRefExpr *Ref) {
>> +  return Ref->getKind() == MCSymbolRefExpr::VK_WebAssembly_TYPEINDEX;
>>  }
>>
>>  static const MCSection *getFixupSection(const MCExpr *Expr) {
>> @@ -80,41 +65,33 @@ static const MCSection *getFixupSection(
>>    return nullptr;
>>  }
>>
>> -static bool isGlobalType(const MCValue &Target) {
>> -  const MCSymbolRefExpr *RefA = Target.getSymA();
>> -  return RefA && RefA->getKind() == MCSymbolRefExpr::VK_WebAssembly_GLOBAL;
>> -}
>> -
>> -static bool isEventType(const MCValue &Target) {
>> -  const MCSymbolRefExpr *RefA = Target.getSymA();
>> -  return RefA && RefA->getKind() == MCSymbolRefExpr::VK_WebAssembly_EVENT;
>> -}
>> -
>>  unsigned WebAssemblyWasmObjectWriter::getRelocType(const MCValue &Target,
>>                                                     const MCFixup &Fixup) const {
>> -  // WebAssembly functions are not allocated in the data address space. To
>> -  // resolve a pointer to a function, we must use a special relocation type.
>> -  bool IsFunction = isFunctionExpr(Fixup.getValue());
>> +  const MCSymbolRefExpr *RefA = Target.getSymA();
>> +  assert(RefA);
>> +  auto& SymA = cast<MCSymbolWasm>(RefA->getSymbol());
>>
>>    switch (unsigned(Fixup.getKind())) {
>>    case WebAssembly::fixup_code_sleb128_i32:
>> -    if (IsFunction)
>> +    if (SymA.isFunction())
>>        return wasm::R_WASM_TABLE_INDEX_SLEB;
>>      return wasm::R_WASM_MEMORY_ADDR_SLEB;
>>    case WebAssembly::fixup_code_sleb128_i64:
>>      llvm_unreachable("fixup_sleb128_i64 not implemented yet");
>>    case WebAssembly::fixup_code_uleb128_i32:
>> -    if (isGlobalType(Target))
>> +    if (SymA.isFunction()) {
>> +      if (isFunctionSignatureRef(RefA))
>> +        return wasm::R_WASM_TYPE_INDEX_LEB;
>> +      else
>> +        return wasm::R_WASM_FUNCTION_INDEX_LEB;
>> +    }
>> +    if (SymA.isGlobal())
>>        return wasm::R_WASM_GLOBAL_INDEX_LEB;
>> -    if (isFunctionType(Target))
>> -      return wasm::R_WASM_TYPE_INDEX_LEB;
>> -    if (IsFunction)
>> -      return wasm::R_WASM_FUNCTION_INDEX_LEB;
>> -    if (isEventType(Target))
>> +    if (SymA.isEvent())
>>        return wasm::R_WASM_EVENT_INDEX_LEB;
>>      return wasm::R_WASM_MEMORY_ADDR_LEB;
>>    case FK_Data_4:
>> -    if (IsFunction)
>> +    if (SymA.isFunction())
>>        return wasm::R_WASM_TABLE_INDEX_I32;
>>      if (auto Section = static_cast<const MCSectionWasm *>(
>>              getFixupSection(Fixup.getValue()))) {
>>
>> Modified: llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp (original)
>> +++ llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp Fri Feb 22 14:29:34 2019
>> @@ -332,15 +332,6 @@ void WebAssemblyAsmPrinter::EmitInstruct
>>    }
>>  }
>>
>> -const MCExpr *WebAssemblyAsmPrinter::lowerConstant(const Constant *CV) {
>> -  if (const auto *GV = dyn_cast<GlobalValue>(CV))
>> -    if (GV->getValueType()->isFunctionTy()) {
>> -      return MCSymbolRefExpr::create(
>> -          getSymbol(GV), MCSymbolRefExpr::VK_WebAssembly_FUNCTION, OutContext);
>> -    }
>> -  return AsmPrinter::lowerConstant(CV);
>> -}
>> -
>>  bool WebAssemblyAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
>>                                              unsigned OpNo, unsigned AsmVariant,
>>                                              const char *ExtraCode,
>>
>> Modified: llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.h
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.h?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.h (original)
>> +++ llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.h Fri Feb 22 14:29:34 2019
>> @@ -63,7 +63,6 @@ public:
>>    void EmitConstantPool() override;
>>    void EmitFunctionBodyStart() override;
>>    void EmitInstruction(const MachineInstr *MI) override;
>> -  const MCExpr *lowerConstant(const Constant *CV) override;
>>    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
>>                         unsigned AsmVariant, const char *ExtraCode,
>>                         raw_ostream &OS) override;
>>
>> Modified: llvm/trunk/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp (original)
>> +++ llvm/trunk/lib/Target/WebAssembly/WebAssemblyMCInstLower.cpp Fri Feb 22 14:29:34 2019
>> @@ -122,13 +122,8 @@ MCOperand WebAssemblyMCInstLower::lowerS
>>                                                       int64_t Offset,
>>                                                       bool IsFunc, bool IsGlob,
>>                                                       bool IsEvent) const {
>> -  MCSymbolRefExpr::VariantKind VK =
>> -      IsFunc ? MCSymbolRefExpr::VK_WebAssembly_FUNCTION
>> -             : IsGlob ? MCSymbolRefExpr::VK_WebAssembly_GLOBAL
>> -                      : IsEvent ? MCSymbolRefExpr::VK_WebAssembly_EVENT
>> -                                : MCSymbolRefExpr::VK_None;
>> -
>> -  const MCExpr *Expr = MCSymbolRefExpr::create(Sym, VK, Ctx);
>> +  const MCExpr *Expr =
>> +      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, Ctx);
>>
>>    if (Offset != 0) {
>>      if (IsFunc)
>>
>> Modified: llvm/trunk/test/MC/WebAssembly/annotations.s
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/WebAssembly/annotations.s?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/test/MC/WebAssembly/annotations.s (original)
>> +++ llvm/trunk/test/MC/WebAssembly/annotations.s Fri Feb 22 14:29:34 2019
>> @@ -28,7 +28,7 @@ test_annotation:
>>    local.set 0
>>    block    i32
>>    local.get 0
>> -  br_on_exn 0, __cpp_exception at EVENT
>> +  br_on_exn 0, __cpp_exception
>>    rethrow
>>    end_block
>>    end_try
>> @@ -59,7 +59,7 @@ test_annotation:
>>  # CHECK-NEXT:   local.set 0
>>  # CHECK-NEXT:   block    i32
>>  # CHECK-NEXT:   local.get 0
>> -# CHECK-NEXT:   br_on_exn 0, __cpp_exception at EVENT # 0: down to label6
>> +# CHECK-NEXT:   br_on_exn 0, __cpp_exception # 0: down to label6
>>  # CHECK-NEXT:   rethrow                   # to caller
>>  # CHECK-NEXT:   end_block                 # label6:
>>  # CHECK-NEXT:   end_try                   # label5:
>>
>> Modified: llvm/trunk/test/MC/WebAssembly/assembler-binary.ll
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/WebAssembly/assembler-binary.ll?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/test/MC/WebAssembly/assembler-binary.ll (original)
>> +++ llvm/trunk/test/MC/WebAssembly/assembler-binary.ll Fri Feb 22 14:29:34 2019
>> @@ -26,7 +26,7 @@ entry:
>>  ; ASM:         .globl  foo
>>  ; ASM:      foo:
>>  ; ASM-NEXT:    .functype       foo (i32) -> ()
>> -; ASM-NEXT:    call    bar at FUNCTION
>> +; ASM-NEXT:    call    bar
>>  ; ASM-NEXT:    end_function
>>  ; ASM:         .functype       bar () -> ()
>>
>>
>> Modified: llvm/trunk/test/MC/WebAssembly/basic-assembly.s
>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/MC/WebAssembly/basic-assembly.s?rev=354697&r1=354696&r2=354697&view=diff
>> ==============================================================================
>> --- llvm/trunk/test/MC/WebAssembly/basic-assembly.s (original)
>> +++ llvm/trunk/test/MC/WebAssembly/basic-assembly.s Fri Feb 22 14:29:34 2019
>> @@ -26,9 +26,9 @@ test0:
>>      br_if       0        # 0: down to label0
>>  .LBB0_1:
>>      loop        i32      # label1:
>> -    call        something1 at FUNCTION
>> +    call        something1
>>      i64.const   1234
>> -    i32.call    something2 at FUNCTION
>> +    i32.call    something2
>>      i32.const   0
>>      call_indirect 0
>>      i32.const   1
>> @@ -72,7 +72,7 @@ test0:
>>      local.set 0
>>      block       i32
>>      local.get 0
>> -    br_on_exn 0, __cpp_exception at EVENT
>> +    br_on_exn 0, __cpp_exception
>>      rethrow
>>  .LBB0_4:
>>      end_block
>> @@ -81,7 +81,7 @@ test0:
>>      throw 0
>>  .LBB0_5:
>>      #i32.trunc_sat_f32_s
>> -    global.get  __stack_pointer at GLOBAL
>> +    global.get  __stack_pointer
>>      end_function
>>      .globaltype        __stack_pointer, i32
>>
>> @@ -105,9 +105,9 @@ test0:
>>  # CHECK-NEXT:      br_if 0            # 0: down to label0
>>  # CHECK-NEXT:  .LBB0_1:
>>  # CHECK-NEXT:      loop        i32         # label1:
>> -# CHECK-NEXT:      call        something1 at FUNCTION
>> +# CHECK-NEXT:      call        something1
>>  # CHECK-NEXT:      i64.const   1234
>> -# CHECK-NEXT:      i32.call    something2 at FUNCTION
>> +# CHECK-NEXT:      i32.call    something2
>>  # CHECK-NEXT:      i32.const   0
>>  # CHECK-NEXT:      call_indirect 0
>>  # CHECK-NEXT:      i32.const   1
>> @@ -149,7 +149,7 @@ test0:
>>  # CHECK-NEXT:      local.set 0
>>  # CHECK-NEXT:      block       i32
>>  # CHECK-NEXT:      local.get 0
>> -# CHECK-NEXT:      br_on_exn 0, __cpp_exception at EVENT
>> +# CHECK-NEXT:      br_on_exn 0, __cpp_exception
>>  # CHECK-NEXT:      rethrow
>>  # CHECK-NEXT:  .LBB0_4:
>>  # CHECK-NEXT:      end_block
>> @@ -157,7 +157,7 @@ test0:
>>  # CHECK-NEXT:      i32.const 0
>>  # CHECK-NEXT:      throw 0
>>  # CHECK-NEXT:  .LBB0_5:
>> -# CHECK-NEXT:      global.get  __stack_pointer at GLOBAL
>> +# CHECK-NEXT:      global.get  __stack_pointer
>>  # CHECK-NEXT:      end_function
>>
>>  # CHECK:           .globaltype __stack_pointer, i32
>>
>>
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