Second of a three-patch series aiming to fix MSR/MRS on Cortex-M. This adds predicate checking to the Disassembler.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139250 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/FixedLenDecoderEmitter.cpp b/utils/TableGen/FixedLenDecoderEmitter.cpp
index d1f2712..27a5587 100644
--- a/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/utils/TableGen/FixedLenDecoderEmitter.cpp
@@ -330,6 +330,10 @@
std::vector<unsigned> &EndBits, std::vector<uint64_t> &FieldVals,
insn_t &Insn);
+ // Emits code to check the Predicates member of an instruction are true.
+ // Returns true if predicate matches were emitted, false otherwise.
+ bool emitPredicateMatch(raw_ostream &o, unsigned &Indentation,unsigned Opc);
+
// Emits code to decode the singleton. Return true if we have matched all the
// well-known bits.
bool emitSingletonDecoder(raw_ostream &o, unsigned &Indentation,unsigned Opc);
@@ -571,8 +575,9 @@
o.indent(Indentation) <<
"static MCDisassembler::DecodeStatus decode" << Namespace << "Instruction" << BitWidth
<< "(MCInst &MI, uint" << BitWidth << "_t insn, uint64_t Address, "
- << "const void *Decoder) {\n";
+ << "const void *Decoder, const MCSubtargetInfo &STI) {\n";
o.indent(Indentation) << " unsigned tmp = 0;\n (void)tmp;\n" << Emitter->Locals << "\n";
+ o.indent(Indentation) << " unsigned Bits = STI.getFeatureBits();\n";
++Indentation; ++Indentation;
// Emits code to decode the instructions.
@@ -757,6 +762,43 @@
}
+static void emitSinglePredicateMatch(raw_ostream &o, StringRef str,
+ std::string PredicateNamespace) {
+ const char *X = str.str().c_str();
+ if (X[0] == '!')
+ o << "!(Bits & " << PredicateNamespace << "::" << &X[1] << ")";
+ else
+ o << "(Bits & " << PredicateNamespace << "::" << X << ")";
+}
+
+bool FilterChooser::emitPredicateMatch(raw_ostream &o, unsigned &Indentation,
+ unsigned Opc) {
+ ListInit *Predicates = AllInstructions[Opc]->TheDef->getValueAsListInit("Predicates");
+ for (unsigned i = 0; i < Predicates->getSize(); ++i) {
+ Record *Pred = Predicates->getElementAsRecord(i);
+ if (!Pred->getValue("AssemblerMatcherPredicate"))
+ continue;
+
+ std::string P = Pred->getValueAsString("AssemblerCondString");
+
+ if (!P.length())
+ continue;
+
+ if (i != 0)
+ o << " && ";
+
+ StringRef SR(P);
+ std::pair<StringRef, StringRef> pairs = SR.split(',');
+ while (pairs.second.size()) {
+ emitSinglePredicateMatch(o, pairs.first, Emitter->PredicateNamespace);
+ o << " && ";
+ pairs = pairs.second.split(',');
+ }
+ emitSinglePredicateMatch(o, pairs.first, Emitter->PredicateNamespace);
+ }
+ return Predicates->getSize() > 0;
+}
+
// Emits code to decode the singleton. Return true if we have matched all the
// well-known bits.
bool FilterChooser::emitSingletonDecoder(raw_ostream &o, unsigned &Indentation,
@@ -775,7 +817,9 @@
// If we have matched all the well-known bits, just issue a return.
if (Size == 0) {
- o.indent(Indentation) << "{\n";
+ o.indent(Indentation) << "if (";
+ emitPredicateMatch(o, Indentation, Opc);
+ o << ") {\n";
o.indent(Indentation) << " MI.setOpcode(" << Opc << ");\n";
std::vector<OperandInfo>& InsnOperands = Operands[Opc];
for (std::vector<OperandInfo>::iterator
@@ -792,7 +836,7 @@
o.indent(Indentation) << " return " << Emitter->ReturnOK << "; // " << nameWithID(Opc)
<< '\n';
- o.indent(Indentation) << "}\n";
+ o.indent(Indentation) << "}\n"; // Closing predicate block.
return true;
}
@@ -804,12 +848,16 @@
for (I = Size; I != 0; --I) {
o << "Inst{" << EndBits[I-1] << '-' << StartBits[I-1] << "} ";
if (I > 1)
- o << "&& ";
+ o << " && ";
else
o << "for singleton decoding...\n";
}
o.indent(Indentation) << "if (";
+ if (emitPredicateMatch(o, Indentation, Opc) > 0) {
+ o << " &&\n";
+ o.indent(Indentation+4);
+ }
for (I = Size; I != 0; --I) {
NumBits = EndBits[I-1] - StartBits[I-1] + 1;