[llvm-bugs] [Bug 30507] New: Disassembly asserts for certain invalid PowerPC instructions

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https://llvm.org/bugs/show_bug.cgi?id=30507

            Bug ID: 30507
           Summary: Disassembly asserts for certain invalid PowerPC
                    instructions
           Product: libraries
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: njholcomb at wi.rr.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Calls to LLVMDisasmInstruction() with certain invalid PPC instructions fails
due to assertions instead of returning an error. Below are 4 asserts that were
hit, including example input bytes:

Input: fe 47 c0 0a 
llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp:256: void
llvm::PPCInstPrinter::printU1ImmOperand(const llvm::MCInst*, unsigned int,
llvm::raw_ostream&): Assertion `Value <= 1 && "Invalid u1imm argument!"'
failed.

Input: 12 d0 e2 0d 
llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp:277: void
llvm::PPCInstPrinter::printU4ImmOperand(const llvm::MCInst*, unsigned int,
llvm::raw_ostream&): Assertion `Value <= 15 && "Invalid u4imm argument!"'
failed.

Input: 7f 1f ce 5d 
llvm/lib/Target/PowerPC/Disassembler/PPCDisassembler.cpp:210: DecodeStatus
decodeRegisterClass(llvm::MCInst&, uint64_t, const unsigned int (&)[N]) [with
long unsigned int N = 8ul; DecodeStatus = llvm::MCDisassembler::DecodeStatus;
uint64_t = long unsigned int]: Assertion `RegNo < N && "Invalid register
number"' failed.

Input: 7c 96 36 1d 
llvm/include/llvm/MC/MCInst.h:75: int64_t llvm::MCOperand::getImm() const:
Assertion `isImm() && "This is not an immediate"' failed.

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