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TableGen: Fix ASAN error 

Summary:
As a bonus, this arguably improves the code by making it simpler.

gcc 8 on Ubuntu 18.10 reports the following:

==39667==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7fffffff8ae0 at pc 0x555555dbfc68 bp 0x7fffffff8760 sp 0x7fffffff8750
WRITE of size 8 at 0x7fffffff8ae0 thread T0
    #0 0x555555dbfc67 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_Alloc_hider::_Alloc_hider(char*, std::allocator<char>&&) /usr/include/c++/8/bits/basic_string.h:149
    #1 0x555555dbfc67 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&) /usr/include/c++/8/bits/basic_string.h:542
    #2 0x555555dbfc67 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&) /usr/include/c++/8/bits/basic_string.h:6009
    #3 0x555555dbfc67 in searchableFieldType /home/nha/amd/build/san/llvm-src/utils/TableGen/SearchableTableEmitter.cpp:168
    (...)

Address 0x7fffffff8ae0 is located in stack of thread T0 at offset 864 in frame
    #0 0x555555dbef3f in searchableFieldType /home/nha/amd/build/san/llvm-src/utils/TableGen/SearchableTableEmitter.cpp:148

Reviewers: fhahn, simon_tatham, kparzysz

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D53931

llvm-svn: 345749
This commit is contained in:
Nicolai Haehnle 2018-10-31 17:46:21 +00:00
parent 08f64e9083
commit 6feb62a4fb
1 changed files with 9 additions and 11 deletions
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20
llvm/utils/TableGen/SearchableTableEmitter.cpp
View File

@ -155,17 +155,15 @@ private:
} else if (BitsRecTy *BI = dyn_cast<BitsRecTy>(Field.RecType)) {
unsigned NumBits = BI->getNumBits();
if (NumBits <= 8)
NumBits = 8;
else if (NumBits <= 16)
NumBits = 16;
else if (NumBits <= 32)
NumBits = 32;
else if (NumBits <= 64)
NumBits = 64;
else
PrintFatalError(Twine("bitfield '") + Field.Name +
"' too large to search");
return "uint" + utostr(NumBits) + "_t";
return "uint8_t";
if (NumBits <= 16)
return "uint16_t";
if (NumBits <= 32)
return "uint32_t";
if (NumBits <= 64)
return "uint64_t";
PrintFatalError(Twine("bitfield '") + Field.Name +
"' too large to search");
} else if (Field.Enum || Field.IsIntrinsic || Field.IsInstruction)
return "unsigned";
PrintFatalError(Twine("Field '") + Field.Name + "' has unknown type '" +