[LLVMbugs] [Bug 20835] New: llc -march=cpp doesn't work well with strings containing '\0'

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Sep 2 08:54:44 PDT 2014


            Bug ID: 20835
           Summary: llc -march=cpp doesn't work well with strings
                    containing '\0'
           Product: tools
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: virgile.bello at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC

gets converted to:

Constant *const_array_80 = ConstantDataArray::getString(mod->getContext(),
"\x00\x00\xC0\xE0\xF0\xF8\xFC", false);

However, since StringRef will implicitely do a strlen, it will thinks it's a
zero sized string. As a result, it fails later because global and constant
types don't match.

Calling StringRef with explicit size should fix the issue:

Constant *const_array_80 = ConstantDataArray::getString(mod->getContext(),
StringRef("\x00\x00\xC0\xE0\xF0\xF8\xFC", 7), false);

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