[llvm-bugs] [Bug 33980] New: Assertion failed: (getNumber() >= 0 && "cannot get label for unreachable MBB") while building chrome/android for x86_64

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33980

            Bug ID: 33980
           Summary: Assertion failed: (getNumber() >= 0 && "cannot get
                    label for unreachable MBB") while building
                    chrome/android for x86_64
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org

Nicos-MacBook-Pro:src thakis$ cat test.cc
enum CSSValueID {
CSSValueItalic,
CSSValueOblique,
CSSValueNormal,
};


class CSSIdentifierValue {
public:
template <typename T>
inline T ConvertTo() const {}

private:
CSSValueID value_id_;
};

class FontSelectionValueStyle {
};

static const FontSelectionValueStyle NormalSlopeValue() {
static FontSelectionValueStyle* normalSlopeValue = new
FontSelectionValueStyle();
return *normalSlopeValue;
}

static const FontSelectionValueStyle ItalicSlopeValue() {
static FontSelectionValueStyle* normalSlopeValue = new
FontSelectionValueStyle();
return *normalSlopeValue;
}

template <>
inline FontSelectionValueStyle CSSIdentifierValue::ConvertTo() const {
switch (value_id_) {
case CSSValueOblique:
case CSSValueItalic:
return ItalicSlopeValue();
case CSSValueNormal:
return NormalSlopeValue();
default:
break;
}
return NormalSlopeValue();
}

void testconvert() {
CSSIdentifierValue value;
value.ConvertTo<FontSelectionValueStyle>();
}
Nicos-MacBook-Pro:src thakis$ third_party/llvm-build/Release+Asserts/bin/clang
-cc1 -emit-obj -Oz -std=gnu++11 -x c++ test.cc
Assertion failed: (getNumber() >= 0 && "cannot get label for unreachable MBB"),
function getSymbol, file
/b/build/slave/mac_upload_clang/build/src/third_party/llvm/lib/CodeGen/MachineBasicBlock.cpp,
line 56.
0  clang                    0x0000000103ce5c68
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  clang                    0x0000000103ce62f6
llvm::sys::PrintStackTraceOnErrorSignal(llvm::StringRef, bool) + 806
2  libsystem_platform.dylib 0x00007fffa4eb9bba _sigtramp + 26
3  libsystem_platform.dylib 0x00007fffffffffff _sigtramp + 1528063071
4  libsystem_c.dylib        0x00007fffa4d40420 abort + 129
5  libsystem_c.dylib        0x00007fffa4d07893 basename_r + 0
6  clang                    0x0000000103490cff
llvm::MachineBasicBlock::getSymbol() const + 319
7  clang                    0x00000001030a50fb llvm::createX86EvexToVexInsts()
+ 37131
8  clang                    0x00000001030a6873 llvm::createX86EvexToVexInsts()
+ 43139
9  clang                    0x00000001030a0865 llvm::createX86EvexToVexInsts()
+ 18549
10 clang                    0x000000010437aaf4
llvm::AsmPrinter::EmitFunctionBody() + 5524
11 clang                    0x0000000102f1a848 LLVMInitializeSystemZTargetInfo
+ 472
12 clang                    0x00000001034e1074
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 180
13 clang                    0x00000001037abefd
llvm::FPPassManager::runOnFunction(llvm::Function&) + 541
14 clang                    0x00000001037ac173
llvm::FPPassManager::runOnModule(llvm::Module&) + 67
15 clang                    0x00000001037ac6cc
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 972
16 clang                    0x0000000103eace43
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions
const&, clang::CodeGenOptions const&, clang::TargetOptions const&,
clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*,
clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream,
std::__1::default_delete<llvm::raw_pwrite_stream> >) + 13555
17 clang                    0x0000000104098c2c
clang::EmitObjAction::EmitObjAction(llvm::LLVMContext*) + 2092
18 clang                    0x00000001049df9f2 clang::ParseAST(clang::Sema&,
bool, bool) + 466
19 clang                    0x00000001042fe9ac clang::FrontendAction::Execute()
+ 76
20 clang                    0x00000001042a4551
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 1345
21 clang                    0x000000010434a135
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 4341
22 clang                    0x00000001024baec8 cc1_main(llvm::ArrayRef<char
const*>, char const*, void*) + 1416
23 clang                    0x00000001024b8ccc main + 11100
24 clang                    0x00000001024b5ee4 start + 52
Stack dump:
0.      Program arguments: third_party/llvm-build/Release+Asserts/bin/clang
-cc1 -emit-obj -Oz -std=gnu++11 -x c++ test.cc 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'test.cc'.
4.      Running pass 'X86 Assembly Printer' on function
'@_ZNK18CSSIdentifierValue9ConvertToI23FontSelectionValueStyleEET_v'
Abort trap: 6

Nicos-MacBook-Pro:src thakis$ third_party/llvm-build/Release+Asserts/bin/clang
--version  | head
clang version 6.0.0 (trunk 308728)
Target: x86_64-apple-darwin16.3.0
Thread model: posix
InstalledDir:
/Users/thakis/src/chrome/src/third_party/llvm-build/Release+Asserts/bin

  Registered Targets:
    aarch64    - AArch64 (little endian)
    aarch64_be - AArch64 (big endian)
    amdgcn     - AMD GCN GPUs
    arm        - ARM

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