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Revert "[TableGen] AsmMatcher: fix OpIdx computation when HasOptionalOperands is true"

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Breaks check-llvm under ubsan.

This reverts commit r309949.

llvm-svn: 310008
This commit is contained in:
Vitaly Buka 2017-08-04 00:25:24 +00:00
parent 7e30f0bba6
commit e3151040b7
1 changed files with 3 additions and 19 deletions
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22
utils/TableGen/AsmMatcherEmitter.cpp
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@ -1847,30 +1847,13 @@ static void emitConvertFuncs(CodeGenTarget &Target, StringRef ClassName,
CvtOS << " assert(Kind < CVT_NUM_SIGNATURES && \"Invalid signature!\");\n";
CvtOS << " const uint8_t *Converter = ConversionTable[Kind];\n";
if (HasOptionalOperands) {
size_t MaxNumOperands = 0;
for (const auto &MI : Infos) {
MaxNumOperands = std::max(MaxNumOperands, MI->AsmOperands.size());
}
CvtOS << " unsigned DefaultsOffset[" << (MaxNumOperands) << "];\n";
CvtOS << " assert(OptionalOperandsMask.size() == " << (MaxNumOperands)
<< ");\n";
CvtOS << " for (unsigned i = 0, NumDefaults = 0; i < " << (MaxNumOperands)
<< "; ++i) {\n";
CvtOS << " DefaultsOffset[i] = NumDefaults;\n";
CvtOS << " NumDefaults += (OptionalOperandsMask[i] ? 1 : 0);\n";
CvtOS << " }\n";
CvtOS << " unsigned NumDefaults = 0;\n";
}
CvtOS << " unsigned OpIdx;\n";
CvtOS << " Inst.setOpcode(Opcode);\n";
CvtOS << " for (const uint8_t *p = Converter; *p; p+= 2) {\n";
if (HasOptionalOperands) {
// OpIdx has different semantics for Tied operands and the rest of the
// operands. For Tied it is the index in the Inst, therefore we use it
// directly. For the rest of the operands, we need to account for the
// offset.
CvtOS << " OpIdx = *(p + 1);\n";
CvtOS << " OpIdx -= (*p != CVT_Tied) ? DefaultsOffset[*(p + 1) - 1] : "
"0;\n";
CvtOS << " OpIdx = *(p + 1) - NumDefaults;\n";
} else {
CvtOS << " OpIdx = *(p + 1);\n";
}
@ -2005,6 +1988,7 @@ static void emitConvertFuncs(CodeGenTarget &Target, StringRef ClassName,
<< " " << Op.Class->DefaultMethod << "()"
<< "->" << Op.Class->RenderMethod << "(Inst, "
<< OpInfo.MINumOperands << ");\n"
<< " ++NumDefaults;\n"
<< " } else {\n"
<< " static_cast<" << TargetOperandClass
<< "&>(*Operands[OpIdx])." << Op.Class->RenderMethod