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Allow the MCDisassembler to return a "soft fail" status code, indicating an instruction that is disassemblable, but invalid. Only used for ARM UNPREDICTABLE instructions at the moment.

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Patch by James Molloy.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137830 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2011-08-17 17:44:15 +00:00
parent 0e6d230abd
commit 83e3f67fb6
12 changed files with 793 additions and 657 deletions
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38
utils/TableGen/FixedLenDecoderEmitter.cpp
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@@ -238,19 +238,24 @@ protected:
// Width of instructions
unsigned BitWidth;
// Parent emitter
const FixedLenDecoderEmitter *Emitter;
public:
FilterChooser(const FilterChooser &FC) :
AllInstructions(FC.AllInstructions), Opcodes(FC.Opcodes),
Operands(FC.Operands), Filters(FC.Filters),
FilterBitValues(FC.FilterBitValues), Parent(FC.Parent),
BestIndex(FC.BestIndex), BitWidth(FC.BitWidth) { }
BestIndex(FC.BestIndex), BitWidth(FC.BitWidth),
Emitter(FC.Emitter) { }
FilterChooser(const std::vector<const CodeGenInstruction*> &Insts,
const std::vector<unsigned> &IDs,
std::map<unsigned, std::vector<OperandInfo> > &Ops,
unsigned BW) :
unsigned BW,
const FixedLenDecoderEmitter *E) :
AllInstructions(Insts), Opcodes(IDs), Operands(Ops), Filters(),
Parent(NULL), BestIndex(-1), BitWidth(BW) {
Parent(NULL), BestIndex(-1), BitWidth(BW), Emitter(E) {
for (unsigned i = 0; i < BitWidth; ++i)
FilterBitValues.push_back(BIT_UNFILTERED);
@@ -264,7 +269,8 @@ public:
FilterChooser &parent) :
AllInstructions(Insts), Opcodes(IDs), Operands(Ops),
Filters(), FilterBitValues(ParentFilterBitValues),
Parent(&parent), BestIndex(-1), BitWidth(parent.BitWidth) {
Parent(&parent), BestIndex(-1), BitWidth(parent.BitWidth),
Emitter(parent.Emitter) {
doFilter();
}
@@ -563,17 +569,17 @@ unsigned Filter::usefulness() const {
void FilterChooser::emitTop(raw_ostream &o, unsigned Indentation,
std::string Namespace) {
o.indent(Indentation) <<
"static bool decode" << Namespace << "Instruction" << BitWidth
"static MCDisassembler::DecodeStatus decode" << Namespace << "Instruction" << BitWidth
<< "(MCInst &MI, uint" << BitWidth << "_t insn, uint64_t Address, "
<< "const void *Decoder) {\n";
o.indent(Indentation) << " unsigned tmp = 0;\n (void)tmp;\n";
o.indent(Indentation) << " unsigned tmp = 0;\n (void)tmp;\n" << Emitter->Locals << "\n";
++Indentation; ++Indentation;
// Emits code to decode the instructions.
emit(o, Indentation);
o << '\n';
o.indent(Indentation) << "return false;\n";
o.indent(Indentation) << "return " << Emitter->ReturnFail << ";\n";
--Indentation; --Indentation;
o.indent(Indentation) << "}\n";
@@ -744,8 +750,8 @@ void FilterChooser::emitBinaryParser(raw_ostream &o, unsigned &Indentation,
}
if (Decoder != "")
o.indent(Indentation) << " if (!" << Decoder
<< "(MI, tmp, Address, Decoder)) return false;\n";
o.indent(Indentation) << " " << Emitter->GuardPrefix << Decoder
<< "(MI, tmp, Address, Decoder)" << Emitter->GuardPostfix << "\n";
else
o.indent(Indentation) << " MI.addOperand(MCOperand::CreateImm(tmp));\n";
@@ -776,15 +782,15 @@ bool FilterChooser::emitSingletonDecoder(raw_ostream &o, unsigned &Indentation,
I = InsnOperands.begin(), E = InsnOperands.end(); I != E; ++I) {
// If a custom instruction decoder was specified, use that.
if (I->numFields() == 0 && I->Decoder.size()) {
o.indent(Indentation) << " if (!" << I->Decoder
<< "(MI, insn, Address, Decoder)) return false;\n";
o.indent(Indentation) << " " << Emitter->GuardPrefix << I->Decoder
<< "(MI, insn, Address, Decoder)" << Emitter->GuardPostfix << "\n";
break;
}
emitBinaryParser(o, Indentation, *I);
}
o.indent(Indentation) << " return true; // " << nameWithID(Opc)
o.indent(Indentation) << " return " << Emitter->ReturnOK << "; // " << nameWithID(Opc)
<< '\n';
o.indent(Indentation) << "}\n";
return true;
@@ -821,14 +827,14 @@ bool FilterChooser::emitSingletonDecoder(raw_ostream &o, unsigned &Indentation,
I = InsnOperands.begin(), E = InsnOperands.end(); I != E; ++I) {
// If a custom instruction decoder was specified, use that.
if (I->numFields() == 0 && I->Decoder.size()) {
o.indent(Indentation) << " if (!" << I->Decoder
<< "(MI, insn, Address, Decoder)) return false;\n";
o.indent(Indentation) << " " << Emitter->GuardPrefix << I->Decoder
<< "(MI, insn, Address, Decoder)" << Emitter->GuardPostfix << "\n";
break;
}
emitBinaryParser(o, Indentation, *I);
}
o.indent(Indentation) << " return true; // " << nameWithID(Opc)
o.indent(Indentation) << " return " << Emitter->ReturnOK << "; // " << nameWithID(Opc)
<< '\n';
o.indent(Indentation) << "}\n";
@@ -1426,7 +1432,7 @@ void FixedLenDecoderEmitter::run(raw_ostream &o)
// Emit the decoder for this namespace+width combination.
FilterChooser FC(NumberedInstructions, I->second, Operands,
8*I->first.second);
8*I->first.second, this);
FC.emitTop(o, 0, I->first.first);
}