#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
bool isThumbOne() const {
return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2) == 0;
}
+ bool isThumbTwo() const {
+ return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2);
+ }
+ bool hasV6Ops() const {
+ return STI.getFeatureBits() & ARM::HasV6Ops;
+ }
void SwitchMode() {
unsigned FB = ComputeAvailableFeatures(STI.ToggleFeature(ARM::ModeThumb));
setAvailableFeatures(FB);
OperandMatchResultTy parseRotImm(SmallVectorImpl<MCParsedAsmOperand*>&);
OperandMatchResultTy parseBitfield(SmallVectorImpl<MCParsedAsmOperand*>&);
OperandMatchResultTy parsePostIdxReg(SmallVectorImpl<MCParsedAsmOperand*>&);
+ OperandMatchResultTy parseAM3Offset(SmallVectorImpl<MCParsedAsmOperand*>&);
// Asm Match Converter Methods
bool cvtLdWriteBackRegAddrMode2(MCInst &Inst, unsigned Opcode,
const SmallVectorImpl<MCParsedAsmOperand*> &);
+ bool cvtStWriteBackRegAddrModeImm12(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &);
bool cvtStWriteBackRegAddrMode2(MCInst &Inst, unsigned Opcode,
const SmallVectorImpl<MCParsedAsmOperand*> &);
+ bool cvtStWriteBackRegAddrMode3(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &);
bool cvtLdExtTWriteBackImm(MCInst &Inst, unsigned Opcode,
const SmallVectorImpl<MCParsedAsmOperand*> &);
bool cvtLdExtTWriteBackReg(MCInst &Inst, unsigned Opcode,
const SmallVectorImpl<MCParsedAsmOperand*> &);
bool cvtLdrdPre(MCInst &Inst, unsigned Opcode,
const SmallVectorImpl<MCParsedAsmOperand*> &);
+ bool cvtStrdPre(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &);
+ bool cvtLdWriteBackRegAddrMode3(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &);
+ bool cvtThumbMultiply(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &);
bool validateInstruction(MCInst &Inst,
const SmallVectorImpl<MCParsedAsmOperand*> &Ops);
+ void processInstruction(MCInst &Inst,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Ops);
+ bool shouldOmitCCOutOperand(StringRef Mnemonic,
+ SmallVectorImpl<MCParsedAsmOperand*> &Operands);
public:
+ enum ARMMatchResultTy {
+ Match_RequiresITBlock = FIRST_TARGET_MATCH_RESULT_TY,
+ Match_RequiresV6,
+ Match_RequiresThumb2
+ };
+
ARMAsmParser(MCSubtargetInfo &_STI, MCAsmParser &_Parser)
: MCTargetAsmParser(), STI(_STI), Parser(_Parser) {
MCAsmParserExtension::Initialize(_Parser);
SmallVectorImpl<MCParsedAsmOperand*> &Operands);
bool ParseDirective(AsmToken DirectiveID);
+ unsigned checkTargetMatchPredicate(MCInst &Inst);
+
bool MatchAndEmitInstruction(SMLoc IDLoc,
SmallVectorImpl<MCParsedAsmOperand*> &Operands,
MCStreamer &Out);
int64_t Value = CE->getValue();
return Value >= 0 && Value <= 0xffffff;
}
+ bool isImmThumbSR() const {
+ if (Kind != Immediate)
+ return false;
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ if (!CE) return false;
+ int64_t Value = CE->getValue();
+ return Value > 0 && Value < 33;
+ }
bool isPKHLSLImm() const {
if (Kind != Immediate)
return false;
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE) return false;
int64_t Val = CE->getValue();
- return Val > -256 && Val < 256;
+ // Special case, #-0 is INT32_MIN.
+ return (Val > -256 && Val < 256) || Val == INT32_MIN;
}
bool isAddrMode5() const {
if (Kind != Memory)
if (Kind != Memory || !Mem.OffsetRegNum || Mem.isNegative ||
Mem.ShiftType != ARM_AM::no_shift)
return false;
- return true;
+ return isARMLowRegister(Mem.BaseRegNum) &&
+ (!Mem.OffsetRegNum || isARMLowRegister(Mem.OffsetRegNum));
+ }
+ bool isMemThumbRIs4() const {
+ if (Kind != Memory || Mem.OffsetRegNum != 0 ||
+ !isARMLowRegister(Mem.BaseRegNum))
+ return false;
+ // Immediate offset, multiple of 4 in range [0, 124].
+ if (!Mem.OffsetImm) return true;
+ int64_t Val = Mem.OffsetImm->getValue();
+ return Val >= 0 && Val <= 124 && (Val % 4) == 0;
+ }
+ bool isMemThumbRIs2() const {
+ if (Kind != Memory || Mem.OffsetRegNum != 0 ||
+ !isARMLowRegister(Mem.BaseRegNum))
+ return false;
+ // Immediate offset, multiple of 4 in range [0, 62].
+ if (!Mem.OffsetImm) return true;
+ int64_t Val = Mem.OffsetImm->getValue();
+ return Val >= 0 && Val <= 62 && (Val % 2) == 0;
+ }
+ bool isMemThumbRIs1() const {
+ if (Kind != Memory || Mem.OffsetRegNum != 0 ||
+ !isARMLowRegister(Mem.BaseRegNum))
+ return false;
+ // Immediate offset in range [0, 31].
+ if (!Mem.OffsetImm) return true;
+ int64_t Val = Mem.OffsetImm->getValue();
+ return Val >= 0 && Val <= 31;
+ }
+ bool isMemThumbSPI() const {
+ if (Kind != Memory || Mem.OffsetRegNum != 0 || Mem.BaseRegNum != ARM::SP)
+ return false;
+ // Immediate offset, multiple of 4 in range [0, 1020].
+ if (!Mem.OffsetImm) return true;
+ int64_t Val = Mem.OffsetImm->getValue();
+ return Val >= 0 && Val <= 1020 && (Val % 4) == 0;
}
bool isMemImm8Offset() const {
if (Kind != Memory || Mem.OffsetRegNum != 0)
addExpr(Inst, getImm());
}
+ void addImmThumbSROperands(MCInst &Inst, unsigned N) const {
+ assert(N == 1 && "Invalid number of operands!");
+ // The constant encodes as the immediate, except for 32, which encodes as
+ // zero.
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
+ unsigned Imm = CE->getValue();
+ Inst.addOperand(MCOperand::CreateImm((Imm == 32 ? 0 : Imm)));
+ }
+
void addPKHLSLImmOperands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
addExpr(Inst, getImm());
// For register offset, we encode the shift type and negation flag
// here.
Val = ARM_AM::getAM2Opc(Mem.isNegative ? ARM_AM::sub : ARM_AM::add,
- 0, Mem.ShiftType);
+ Mem.ShiftImm, Mem.ShiftType);
}
Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
Inst.addOperand(MCOperand::CreateReg(Mem.OffsetRegNum));
ARM_AM::getAM3Opc(PostIdxReg.isAdd ? ARM_AM::add : ARM_AM::sub, 0);
Inst.addOperand(MCOperand::CreateReg(PostIdxReg.RegNum));
Inst.addOperand(MCOperand::CreateImm(Val));
+ return;
}
// Constant offset.
// Special case for #-0
if (Val == INT32_MIN) Val = 0;
if (Val < 0) Val = -Val;
- Val = ARM_AM::getAM2Opc(AddSub, Val, ARM_AM::no_shift);
+ Val = ARM_AM::getAM3Opc(AddSub, Val);
Inst.addOperand(MCOperand::CreateReg(0));
Inst.addOperand(MCOperand::CreateImm(Val));
}
Inst.addOperand(MCOperand::CreateReg(Mem.OffsetRegNum));
}
+ void addMemThumbRIs4Operands(MCInst &Inst, unsigned N) const {
+ assert(N == 2 && "Invalid number of operands!");
+ int64_t Val = Mem.OffsetImm ? (Mem.OffsetImm->getValue() / 4) : 0;
+ Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
+ Inst.addOperand(MCOperand::CreateImm(Val));
+ }
+
+ void addMemThumbRIs2Operands(MCInst &Inst, unsigned N) const {
+ assert(N == 2 && "Invalid number of operands!");
+ int64_t Val = Mem.OffsetImm ? (Mem.OffsetImm->getValue() / 2) : 0;
+ Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
+ Inst.addOperand(MCOperand::CreateImm(Val));
+ }
+
+ void addMemThumbRIs1Operands(MCInst &Inst, unsigned N) const {
+ assert(N == 2 && "Invalid number of operands!");
+ int64_t Val = Mem.OffsetImm ? (Mem.OffsetImm->getValue()) : 0;
+ Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
+ Inst.addOperand(MCOperand::CreateImm(Val));
+ }
+
+ void addMemThumbSPIOperands(MCInst &Inst, unsigned N) const {
+ assert(N == 2 && "Invalid number of operands!");
+ int64_t Val = Mem.OffsetImm ? (Mem.OffsetImm->getValue() / 4) : 0;
+ Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
+ Inst.addOperand(MCOperand::CreateImm(Val));
+ }
+
void addPostIdxImm8Operands(MCInst &Inst, unsigned N) const {
assert(N == 1 && "Invalid number of operands!");
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
Parser.Lex(); // Eat right curly brace token.
// Verify the register list.
- SmallVectorImpl<std::pair<unsigned, SMLoc> >::const_iterator
- RI = Registers.begin(), RE = Registers.end();
-
- unsigned HighRegNum = getARMRegisterNumbering(RI->first);
bool EmittedWarning = false;
-
- DenseMap<unsigned, bool> RegMap;
- RegMap[HighRegNum] = true;
-
- for (++RI; RI != RE; ++RI) {
- const std::pair<unsigned, SMLoc> &RegInfo = *RI;
+ unsigned HighRegNum = 0;
+ BitVector RegMap(32);
+ for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
+ const std::pair<unsigned, SMLoc> &RegInfo = Registers[i];
unsigned Reg = getARMRegisterNumbering(RegInfo.first);
if (RegMap[Reg]) {
Warning(RegInfo.second,
"register not in ascending order in register list");
- RegMap[Reg] = true;
+ RegMap.set(Reg);
HighRegNum = std::max(Reg, HighRegNum);
}
return MatchOperand_Success;
}
+ARMAsmParser::OperandMatchResultTy ARMAsmParser::
+parseAM3Offset(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ // Check for a post-index addressing register operand. Specifically:
+ // am3offset := '+' register
+ // | '-' register
+ // | register
+ // | # imm
+ // | # + imm
+ // | # - imm
+
+ // This method must return MatchOperand_NoMatch without consuming any tokens
+ // in the case where there is no match, as other alternatives take other
+ // parse methods.
+ AsmToken Tok = Parser.getTok();
+ SMLoc S = Tok.getLoc();
+
+ // Do immediates first, as we always parse those if we have a '#'.
+ if (Parser.getTok().is(AsmToken::Hash)) {
+ Parser.Lex(); // Eat the '#'.
+ // Explicitly look for a '-', as we need to encode negative zero
+ // differently.
+ bool isNegative = Parser.getTok().is(AsmToken::Minus);
+ const MCExpr *Offset;
+ if (getParser().ParseExpression(Offset))
+ return MatchOperand_ParseFail;
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Offset);
+ if (!CE) {
+ Error(S, "constant expression expected");
+ return MatchOperand_ParseFail;
+ }
+ SMLoc E = Tok.getLoc();
+ // Negative zero is encoded as the flag value INT32_MIN.
+ int32_t Val = CE->getValue();
+ if (isNegative && Val == 0)
+ Val = INT32_MIN;
+
+ Operands.push_back(
+ ARMOperand::CreateImm(MCConstantExpr::Create(Val, getContext()), S, E));
+
+ return MatchOperand_Success;
+ }
+
+
+ bool haveEaten = false;
+ bool isAdd = true;
+ int Reg = -1;
+ if (Tok.is(AsmToken::Plus)) {
+ Parser.Lex(); // Eat the '+' token.
+ haveEaten = true;
+ } else if (Tok.is(AsmToken::Minus)) {
+ Parser.Lex(); // Eat the '-' token.
+ isAdd = false;
+ haveEaten = true;
+ }
+ if (Parser.getTok().is(AsmToken::Identifier))
+ Reg = tryParseRegister();
+ if (Reg == -1) {
+ if (!haveEaten)
+ return MatchOperand_NoMatch;
+ Error(Parser.getTok().getLoc(), "register expected");
+ return MatchOperand_ParseFail;
+ }
+ SMLoc E = Parser.getTok().getLoc();
+
+ Operands.push_back(ARMOperand::CreatePostIdxReg(Reg, isAdd, ARM_AM::no_shift,
+ 0, S, E));
+
+ return MatchOperand_Success;
+}
+
/// cvtLdWriteBackRegAddrMode2 - Convert parsed operands to MCInst.
/// Needed here because the Asm Gen Matcher can't handle properly tied operands
/// when they refer multiple MIOperands inside a single one.
return true;
}
+/// cvtStWriteBackRegAddrModeImm12 - Convert parsed operands to MCInst.
+/// Needed here because the Asm Gen Matcher can't handle properly tied operands
+/// when they refer multiple MIOperands inside a single one.
+bool ARMAsmParser::
+cvtStWriteBackRegAddrModeImm12(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ // Create a writeback register dummy placeholder.
+ Inst.addOperand(MCOperand::CreateImm(0));
+ ((ARMOperand*)Operands[2])->addRegOperands(Inst, 1);
+ ((ARMOperand*)Operands[3])->addMemImm12OffsetOperands(Inst, 2);
+ ((ARMOperand*)Operands[1])->addCondCodeOperands(Inst, 2);
+ return true;
+}
+
/// cvtStWriteBackRegAddrMode2 - Convert parsed operands to MCInst.
/// Needed here because the Asm Gen Matcher can't handle properly tied operands
/// when they refer multiple MIOperands inside a single one.
const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
// Create a writeback register dummy placeholder.
Inst.addOperand(MCOperand::CreateImm(0));
- assert(0 && "cvtStWriteBackRegAddrMode2 not implemented yet!");
+ ((ARMOperand*)Operands[2])->addRegOperands(Inst, 1);
+ ((ARMOperand*)Operands[3])->addAddrMode2Operands(Inst, 3);
+ ((ARMOperand*)Operands[1])->addCondCodeOperands(Inst, 2);
+ return true;
+}
+
+/// cvtStWriteBackRegAddrMode3 - Convert parsed operands to MCInst.
+/// Needed here because the Asm Gen Matcher can't handle properly tied operands
+/// when they refer multiple MIOperands inside a single one.
+bool ARMAsmParser::
+cvtStWriteBackRegAddrMode3(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ // Create a writeback register dummy placeholder.
+ Inst.addOperand(MCOperand::CreateImm(0));
+ ((ARMOperand*)Operands[2])->addRegOperands(Inst, 1);
+ ((ARMOperand*)Operands[3])->addAddrMode3Operands(Inst, 3);
+ ((ARMOperand*)Operands[1])->addCondCodeOperands(Inst, 2);
return true;
}
return true;
}
+/// cvtStrdPre - Convert parsed operands to MCInst.
+/// Needed here because the Asm Gen Matcher can't handle properly tied operands
+/// when they refer multiple MIOperands inside a single one.
+bool ARMAsmParser::
+cvtStrdPre(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ // Create a writeback register dummy placeholder.
+ Inst.addOperand(MCOperand::CreateImm(0));
+ // Rt, Rt2
+ ((ARMOperand*)Operands[2])->addRegOperands(Inst, 1);
+ ((ARMOperand*)Operands[3])->addRegOperands(Inst, 1);
+ // addr
+ ((ARMOperand*)Operands[4])->addAddrMode3Operands(Inst, 3);
+ // pred
+ ((ARMOperand*)Operands[1])->addCondCodeOperands(Inst, 2);
+ return true;
+}
+
+/// cvtLdWriteBackRegAddrMode3 - Convert parsed operands to MCInst.
+/// Needed here because the Asm Gen Matcher can't handle properly tied operands
+/// when they refer multiple MIOperands inside a single one.
+bool ARMAsmParser::
+cvtLdWriteBackRegAddrMode3(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ ((ARMOperand*)Operands[2])->addRegOperands(Inst, 1);
+ // Create a writeback register dummy placeholder.
+ Inst.addOperand(MCOperand::CreateImm(0));
+ ((ARMOperand*)Operands[3])->addAddrMode3Operands(Inst, 3);
+ ((ARMOperand*)Operands[1])->addCondCodeOperands(Inst, 2);
+ return true;
+}
+
+/// cvtThumbMultiple- Convert parsed operands to MCInst.
+/// Needed here because the Asm Gen Matcher can't handle properly tied operands
+/// when they refer multiple MIOperands inside a single one.
+bool ARMAsmParser::
+cvtThumbMultiply(MCInst &Inst, unsigned Opcode,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ // The second source operand must be the same register as the destination
+ // operand.
+ if (Operands.size() == 6 &&
+ (((ARMOperand*)Operands[3])->getReg() !=
+ ((ARMOperand*)Operands[5])->getReg()) &&
+ (((ARMOperand*)Operands[3])->getReg() !=
+ ((ARMOperand*)Operands[4])->getReg())) {
+ Error(Operands[3]->getStartLoc(),
+ "destination register must match source register");
+ return false;
+ }
+ ((ARMOperand*)Operands[3])->addRegOperands(Inst, 1);
+ ((ARMOperand*)Operands[1])->addCCOutOperands(Inst, 1);
+ ((ARMOperand*)Operands[4])->addRegOperands(Inst, 1);
+ // If we have a three-operand form, use that, else the second source operand
+ // is just the destination operand again.
+ if (Operands.size() == 6)
+ ((ARMOperand*)Operands[5])->addRegOperands(Inst, 1);
+ else
+ Inst.addOperand(Inst.getOperand(0));
+ ((ARMOperand*)Operands[2])->addCondCodeOperands(Inst, 2);
+
+ return true;
+}
+
/// Parse an ARM memory expression, return false if successful else return true
/// or an error. The first token must be a '[' when called.
bool ARMAsmParser::
// predicated but do have a carry-set and so weren't caught above.
if (Mnemonic != "adcs" && Mnemonic != "bics" && Mnemonic != "movs" &&
Mnemonic != "muls" && Mnemonic != "smlals" && Mnemonic != "smulls" &&
- Mnemonic != "umlals" && Mnemonic != "umulls") {
+ Mnemonic != "umlals" && Mnemonic != "umulls" && Mnemonic != "lsls" &&
+ Mnemonic != "sbcs") {
unsigned CC = StringSwitch<unsigned>(Mnemonic.substr(Mnemonic.size()-2))
.Case("eq", ARMCC::EQ)
.Case("ne", ARMCC::NE)
// Next, determine if we have a carry setting bit. We explicitly ignore all
// the instructions we know end in 's'.
if (Mnemonic.endswith("s") &&
- !(Mnemonic == "asrs" || Mnemonic == "cps" || Mnemonic == "mls" ||
+ !(Mnemonic == "cps" || Mnemonic == "mls" ||
Mnemonic == "mrs" || Mnemonic == "smmls" || Mnemonic == "vabs" ||
Mnemonic == "vcls" || Mnemonic == "vmls" || Mnemonic == "vmrs" ||
Mnemonic == "vnmls" || Mnemonic == "vqabs" || Mnemonic == "vrecps" ||
Mnemonic == "umlal" || Mnemonic == "orr" || Mnemonic == "mvn" ||
Mnemonic == "rsb" || Mnemonic == "rsc" || Mnemonic == "orn" ||
Mnemonic == "sbc" || Mnemonic == "mla" || Mnemonic == "umull" ||
- Mnemonic == "eor" || Mnemonic == "smlal" ||
+ Mnemonic == "eor" || Mnemonic == "smlal" || Mnemonic == "neg" ||
+ // FIXME: We need a better way. This really confused Thumb2
+ // parsing for 'mov'.
(Mnemonic == "mov" && !isThumbOne())) {
CanAcceptCarrySet = true;
} else {
Mnemonic == "trap" || Mnemonic == "mrc2" || Mnemonic == "mrrc2" ||
Mnemonic == "dsb" || Mnemonic == "isb" || Mnemonic == "clrex" ||
Mnemonic == "setend" ||
+ (Mnemonic == "nop" && isThumbOne()) ||
((Mnemonic == "pld" || Mnemonic == "pli") && !isThumb()) ||
((Mnemonic.startswith("rfe") || Mnemonic.startswith("srs"))
&& !isThumb()) ||
CanAcceptPredicationCode = false;
}
+bool ARMAsmParser::shouldOmitCCOutOperand(StringRef Mnemonic,
+ SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+
+ // The 'mov' mnemonic is special. One variant has a cc_out operand, while
+ // another does not. Specifically, the MOVW instruction does not. So we
+ // special case it here and remove the defaulted (non-setting) cc_out
+ // operand if that's the instruction we're trying to match.
+ //
+ // We do this as post-processing of the explicit operands rather than just
+ // conditionally adding the cc_out in the first place because we need
+ // to check the type of the parsed immediate operand.
+ if (Mnemonic == "mov" && Operands.size() > 4 &&
+ !static_cast<ARMOperand*>(Operands[4])->isARMSOImm() &&
+ static_cast<ARMOperand*>(Operands[4])->isImm0_65535Expr() &&
+ static_cast<ARMOperand*>(Operands[1])->getReg() == 0)
+ return true;
+
+ // Register-register 'add' for thumb does not have a cc_out operand
+ // when there are only two register operands.
+ if (isThumb() && Mnemonic == "add" && Operands.size() == 5 &&
+ static_cast<ARMOperand*>(Operands[3])->isReg() &&
+ static_cast<ARMOperand*>(Operands[4])->isReg() &&
+ static_cast<ARMOperand*>(Operands[1])->getReg() == 0)
+ return true;
+
+ return false;
+}
+
/// Parse an arm instruction mnemonic followed by its operands.
bool ARMAsmParser::ParseInstruction(StringRef Name, SMLoc NameLoc,
SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
Parser.Lex(); // Consume the EndOfStatement
-
- // The 'mov' mnemonic is special. One variant has a cc_out operand, while
- // another does not. Specifically, the MOVW instruction does not. So we
- // special case it here and remove the defaulted (non-setting) cc_out
- // operand if that's the instruction we're trying to match.
- //
- // We do this post-processing of the explicit operands rather than just
- // conditionally adding the cc_out in the first place because we need
- // to check the type of the parsed immediate operand.
- if (Mnemonic == "mov" && Operands.size() > 4 &&
- !static_cast<ARMOperand*>(Operands[4])->isARMSOImm() &&
- static_cast<ARMOperand*>(Operands[4])->isImm0_65535Expr() &&
- static_cast<ARMOperand*>(Operands[1])->getReg() == 0) {
+ // Some instructions, mostly Thumb, have forms for the same mnemonic that
+ // do and don't have a cc_out optional-def operand. With some spot-checks
+ // of the operand list, we can figure out which variant we're trying to
+ // parse and adjust accordingly before actually matching. Reason number
+ // #317 the table driven matcher doesn't fit well with the ARM instruction
+ // set.
+ if (shouldOmitCCOutOperand(Mnemonic, Operands)) {
ARMOperand *Op = static_cast<ARMOperand*>(Operands[1]);
Operands.erase(Operands.begin() + 1);
delete Op;
Operands.erase(Operands.begin() + 1);
delete Op;
}
+
+ // The vector-compare-to-zero instructions have a literal token "#0" at
+ // the end that comes to here as an immediate operand. Convert it to a
+ // token to play nicely with the matcher.
+ if ((Mnemonic == "vceq" || Mnemonic == "vcge" || Mnemonic == "vcgt" ||
+ Mnemonic == "vcle" || Mnemonic == "vclt") && Operands.size() == 6 &&
+ static_cast<ARMOperand*>(Operands[5])->isImm()) {
+ ARMOperand *Op = static_cast<ARMOperand*>(Operands[5]);
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
+ if (CE && CE->getValue() == 0) {
+ Operands.erase(Operands.begin() + 5);
+ Operands.push_back(ARMOperand::CreateToken("#0", Op->getStartLoc()));
+ delete Op;
+ }
+ }
+ // Similarly, the Thumb1 "RSB" instruction has a literal "#0" on the
+ // end. Convert it to a token here.
+ if (Mnemonic == "rsb" && isThumb() && Operands.size() == 6 &&
+ static_cast<ARMOperand*>(Operands[5])->isImm()) {
+ ARMOperand *Op = static_cast<ARMOperand*>(Operands[5]);
+ const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
+ if (CE && CE->getValue() == 0) {
+ Operands.erase(Operands.begin() + 5);
+ Operands.push_back(ARMOperand::CreateToken("#0", Op->getStartLoc()));
+ delete Op;
+ }
+ }
+
return false;
}
// Validate context-sensitive operand constraints.
+
+// return 'true' if register list contains non-low GPR registers,
+// 'false' otherwise. If Reg is in the register list or is HiReg, set
+// 'containsReg' to true.
+static bool checkLowRegisterList(MCInst Inst, unsigned OpNo, unsigned Reg,
+ unsigned HiReg, bool &containsReg) {
+ containsReg = false;
+ for (unsigned i = OpNo; i < Inst.getNumOperands(); ++i) {
+ unsigned OpReg = Inst.getOperand(i).getReg();
+ if (OpReg == Reg)
+ containsReg = true;
+ // Anything other than a low register isn't legal here.
+ if (!isARMLowRegister(OpReg) && (!HiReg || OpReg != HiReg))
+ return true;
+ }
+ return false;
+}
+
// FIXME: We would really like to be able to tablegen'erate this.
bool ARMAsmParser::
validateInstruction(MCInst &Inst,
"destination operands must be sequential");
return false;
}
- case ARM::STRD:
+ case ARM::STRD: {
+ // Rt2 must be Rt + 1.
+ unsigned Rt = getARMRegisterNumbering(Inst.getOperand(0).getReg());
+ unsigned Rt2 = getARMRegisterNumbering(Inst.getOperand(1).getReg());
+ if (Rt2 != Rt + 1)
+ return Error(Operands[3]->getStartLoc(),
+ "source operands must be sequential");
+ return false;
+ }
case ARM::STRD_PRE:
case ARM::STRD_POST:
case ARM::STREXD: {
unsigned Rt = getARMRegisterNumbering(Inst.getOperand(1).getReg());
unsigned Rt2 = getARMRegisterNumbering(Inst.getOperand(2).getReg());
if (Rt2 != Rt + 1)
- return Error(Operands[4]->getStartLoc(),
+ return Error(Operands[3]->getStartLoc(),
"source operands must be sequential");
return false;
}
if (widthm1 >= 32 - lsb)
return Error(Operands[5]->getStartLoc(),
"bitfield width must be in range [1,32-lsb]");
+ return false;
+ }
+ case ARM::tLDMIA: {
+ // Thumb LDM instructions are writeback iff the base register is not
+ // in the register list.
+ unsigned Rn = Inst.getOperand(0).getReg();
+ bool hasWritebackToken =
+ (static_cast<ARMOperand*>(Operands[3])->isToken() &&
+ static_cast<ARMOperand*>(Operands[3])->getToken() == "!");
+ bool listContainsBase;
+ if (checkLowRegisterList(Inst, 3, Rn, 0, listContainsBase))
+ return Error(Operands[3 + hasWritebackToken]->getStartLoc(),
+ "registers must be in range r0-r7");
+ // If we should have writeback, then there should be a '!' token.
+ if (!listContainsBase && !hasWritebackToken)
+ return Error(Operands[2]->getStartLoc(),
+ "writeback operator '!' expected");
+ // Likewise, if we should not have writeback, there must not be a '!'
+ if (listContainsBase && hasWritebackToken)
+ return Error(Operands[3]->getStartLoc(),
+ "writeback operator '!' not allowed when base register "
+ "in register list");
+
+ break;
+ }
+ case ARM::tPOP: {
+ bool listContainsBase;
+ if (checkLowRegisterList(Inst, 3, 0, ARM::PC, listContainsBase))
+ return Error(Operands[2]->getStartLoc(),
+ "registers must be in range r0-r7 or pc");
+ break;
+ }
+ case ARM::tPUSH: {
+ bool listContainsBase;
+ if (checkLowRegisterList(Inst, 3, 0, ARM::LR, listContainsBase))
+ return Error(Operands[2]->getStartLoc(),
+ "registers must be in range r0-r7 or lr");
+ break;
+ }
+ case ARM::tSTMIA_UPD: {
+ bool listContainsBase;
+ if (checkLowRegisterList(Inst, 3, 0, 0, listContainsBase))
+ return Error(Operands[4]->getStartLoc(),
+ "registers must be in range r0-r7");
+ break;
}
}
return false;
}
+void ARMAsmParser::
+processInstruction(MCInst &Inst,
+ const SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
+ switch (Inst.getOpcode()) {
+ case ARM::LDMIA_UPD:
+ // If this is a load of a single register via a 'pop', then we should use
+ // a post-indexed LDR instruction instead, per the ARM ARM.
+ if (static_cast<ARMOperand*>(Operands[0])->getToken() == "pop" &&
+ Inst.getNumOperands() == 5) {
+ MCInst TmpInst;
+ TmpInst.setOpcode(ARM::LDR_POST_IMM);
+ TmpInst.addOperand(Inst.getOperand(4)); // Rt
+ TmpInst.addOperand(Inst.getOperand(0)); // Rn_wb
+ TmpInst.addOperand(Inst.getOperand(1)); // Rn
+ TmpInst.addOperand(MCOperand::CreateReg(0)); // am2offset
+ TmpInst.addOperand(MCOperand::CreateImm(4));
+ TmpInst.addOperand(Inst.getOperand(2)); // CondCode
+ TmpInst.addOperand(Inst.getOperand(3));
+ Inst = TmpInst;
+ }
+ break;
+ case ARM::STMDB_UPD:
+ // If this is a store of a single register via a 'push', then we should use
+ // a pre-indexed STR instruction instead, per the ARM ARM.
+ if (static_cast<ARMOperand*>(Operands[0])->getToken() == "push" &&
+ Inst.getNumOperands() == 5) {
+ MCInst TmpInst;
+ TmpInst.setOpcode(ARM::STR_PRE_IMM);
+ TmpInst.addOperand(Inst.getOperand(0)); // Rn_wb
+ TmpInst.addOperand(Inst.getOperand(4)); // Rt
+ TmpInst.addOperand(Inst.getOperand(1)); // addrmode_imm12
+ TmpInst.addOperand(MCOperand::CreateImm(-4));
+ TmpInst.addOperand(Inst.getOperand(2)); // CondCode
+ TmpInst.addOperand(Inst.getOperand(3));
+ Inst = TmpInst;
+ }
+ break;
+ case ARM::tADDi8:
+ // If the immediate is in the range 0-7, we really wanted tADDi3.
+ if (Inst.getOperand(3).getImm() < 8)
+ Inst.setOpcode(ARM::tADDi3);
+ break;
+ case ARM::tBcc:
+ // If the conditional is AL, we really want tB.
+ if (Inst.getOperand(1).getImm() == ARMCC::AL)
+ Inst.setOpcode(ARM::tB);
+ break;
+ }
+}
+
+// FIXME: We would really prefer to have MCInstrInfo (the wrapper around
+// the ARMInsts array) instead. Getting that here requires awkward
+// API changes, though. Better way?
+namespace llvm {
+extern MCInstrDesc ARMInsts[];
+}
+static MCInstrDesc &getInstDesc(unsigned Opcode) {
+ return ARMInsts[Opcode];
+}
+
+unsigned ARMAsmParser::checkTargetMatchPredicate(MCInst &Inst) {
+ // 16-bit thumb arithmetic instructions either require or preclude the 'S'
+ // suffix depending on whether they're in an IT block or not.
+ unsigned Opc = Inst.getOpcode();
+ MCInstrDesc &MCID = getInstDesc(Opc);
+ if (MCID.TSFlags & ARMII::ThumbArithFlagSetting) {
+ assert(MCID.hasOptionalDef() &&
+ "optionally flag setting instruction missing optional def operand");
+ assert(MCID.NumOperands == Inst.getNumOperands() &&
+ "operand count mismatch!");
+ // Find the optional-def operand (cc_out).
+ unsigned OpNo;
+ for (OpNo = 0;
+ !MCID.OpInfo[OpNo].isOptionalDef() && OpNo < MCID.NumOperands;
+ ++OpNo)
+ ;
+ // If we're parsing Thumb1, reject it completely.
+ if (isThumbOne() && Inst.getOperand(OpNo).getReg() != ARM::CPSR)
+ return Match_MnemonicFail;
+ // If we're parsing Thumb2, which form is legal depends on whether we're
+ // in an IT block.
+ // FIXME: We don't yet do IT blocks, so just always consider it to be
+ // that we aren't in one until we do.
+ if (isThumbTwo() && Inst.getOperand(OpNo).getReg() != ARM::CPSR)
+ return Match_RequiresITBlock;
+ }
+ // Some high-register supporting Thumb1 encodings only allow both registers
+ // to be from r0-r7 when in Thumb2.
+ else if (Opc == ARM::tADDhirr && isThumbOne() &&
+ isARMLowRegister(Inst.getOperand(1).getReg()) &&
+ isARMLowRegister(Inst.getOperand(2).getReg()))
+ return Match_RequiresThumb2;
+ // Others only require ARMv6 or later.
+ else if (Opc == ARM::tMOVr && isThumbOne() && !hasV6Ops() &&
+ isARMLowRegister(Inst.getOperand(0).getReg()) &&
+ isARMLowRegister(Inst.getOperand(1).getReg()))
+ return Match_RequiresV6;
+ return Match_Success;
+}
+
bool ARMAsmParser::
MatchAndEmitInstruction(SMLoc IDLoc,
SmallVectorImpl<MCParsedAsmOperand*> &Operands,
MCStreamer &Out) {
MCInst Inst;
unsigned ErrorInfo;
- MatchResultTy MatchResult;
+ unsigned MatchResult;
MatchResult = MatchInstructionImpl(Operands, Inst, ErrorInfo);
switch (MatchResult) {
+ default: break;
case Match_Success:
// Context sensitive operand constraints aren't handled by the matcher,
// so check them here.
if (validateInstruction(Inst, Operands))
return true;
+ // Some instructions need post-processing to, for example, tweak which
+ // encoding is selected.
+ processInstruction(Inst, Operands);
+
Out.EmitInstruction(Inst);
return false;
case Match_MissingFeature:
return Error(ErrorLoc, "invalid operand for instruction");
}
case Match_MnemonicFail:
- return Error(IDLoc, "unrecognized instruction mnemonic");
+ return Error(IDLoc, "invalid instruction");
case Match_ConversionFail:
- return Error(IDLoc, "unable to convert operands to instruction");
+ // The converter function will have already emited a diagnostic.
+ return true;
+ case Match_RequiresITBlock:
+ return Error(IDLoc, "instruction only valid inside IT block");
+ case Match_RequiresV6:
+ return Error(IDLoc, "instruction variant requires ARMv6 or later");
+ case Match_RequiresThumb2:
+ return Error(IDLoc, "instruction variant requires Thumb2");
}
llvm_unreachable("Implement any new match types added!");
projects / oota-llvm.git / blobdiff