[Hexagon] Adding basic disassembler.
Marking all instructions as CodeGenOnly since encoding bits are not set yet.
http://reviews.llvm.org/D5829?vs=on&id=15023&whitespace=ignore-all#toc
llvm-svn: 220393
diff --git a/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp b/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
new file mode 100644
index 0000000..688b8e6
--- /dev/null
+++ b/llvm/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
@@ -0,0 +1,131 @@
+//===-- HexagonDisassembler.cpp - Disassembler for Hexagon ISA ------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MCTargetDesc/HexagonBaseInfo.h"
+#include "MCTargetDesc/HexagonMCTargetDesc.h"
+
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDisassembler.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCFixedLenDisassembler.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstrDesc.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/Support/MemoryObject.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/Endian.h"
+
+#include <vector>
+#include <array>
+
+using namespace llvm;
+
+#define DEBUG_TYPE "hexagon-disassembler"
+
+using DecodeStatus = MCDisassembler::DecodeStatus;
+
+namespace {
+/// \brief Hexagon disassembler for all Hexagon platforms.
+class HexagonDisassembler : public MCDisassembler {
+public:
+ HexagonDisassembler(MCSubtargetInfo const &STI, MCContext &Ctx)
+ : MCDisassembler(STI, Ctx) {}
+
+ DecodeStatus getInstruction(MCInst &instr, uint64_t &size,
+ MemoryObject const ®ion, uint64_t address,
+ raw_ostream &vStream, raw_ostream &cStream) const override;
+};
+}
+
+static const uint16_t IntRegDecoderTable[] = {
+ Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
+ Hexagon::R5, Hexagon::R6, Hexagon::R7, Hexagon::R8, Hexagon::R9,
+ Hexagon::R10, Hexagon::R11, Hexagon::R12, Hexagon::R13, Hexagon::R14,
+ Hexagon::R15, Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
+ Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23, Hexagon::R24,
+ Hexagon::R25, Hexagon::R26, Hexagon::R27, Hexagon::R28, Hexagon::R29,
+ Hexagon::R30, Hexagon::R31};
+
+static const uint16_t DoubleRegDecoderTable[] = {
+ Hexagon::D0, Hexagon::D1, Hexagon::D2, Hexagon::D3,
+ Hexagon::D4, Hexagon::D5, Hexagon::D6, Hexagon::D7,
+ Hexagon::D8, Hexagon::D9, Hexagon::D10, Hexagon::D11,
+ Hexagon::D12, Hexagon::D13, Hexagon::D14, Hexagon::D15};
+
+static const uint16_t PredRegDecoderTable[] = {Hexagon::P0, Hexagon::P1,
+ Hexagon::P2, Hexagon::P3};
+
+static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, unsigned RegNo,
+ uint64_t /*Address*/,
+ void const *Decoder) {
+ if (RegNo > 31)
+ return MCDisassembler::Fail;
+
+ unsigned Register = IntRegDecoderTable[RegNo];
+ Inst.addOperand(MCOperand::CreateReg(Register));
+ return MCDisassembler::Success;
+}
+
+static DecodeStatus DecodeDoubleRegsRegisterClass(MCInst &Inst, unsigned RegNo,
+ uint64_t /*Address*/,
+ void const *Decoder) {
+ if (RegNo > 15)
+ return MCDisassembler::Fail;
+
+ unsigned Register = DoubleRegDecoderTable[RegNo];
+ Inst.addOperand(MCOperand::CreateReg(Register));
+ return MCDisassembler::Success;
+}
+
+static DecodeStatus DecodePredRegsRegisterClass(MCInst &Inst, unsigned RegNo,
+ uint64_t /*Address*/,
+ void const *Decoder) {
+ if (RegNo > 3)
+ return MCDisassembler::Fail;
+
+ unsigned Register = PredRegDecoderTable[RegNo];
+ Inst.addOperand(MCOperand::CreateReg(Register));
+ return MCDisassembler::Success;
+}
+
+#include "HexagonGenDisassemblerTables.inc"
+
+static MCDisassembler *createHexagonDisassembler(Target const &T,
+ MCSubtargetInfo const &STI,
+ MCContext &Ctx) {
+ return new HexagonDisassembler(STI, Ctx);
+}
+
+extern "C" void LLVMInitializeHexagonDisassembler() {
+ TargetRegistry::RegisterMCDisassembler(TheHexagonTarget,
+ createHexagonDisassembler);
+}
+
+DecodeStatus HexagonDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
+ MemoryObject const &Region,
+ uint64_t Address,
+ raw_ostream &os,
+ raw_ostream &cs) const {
+ std::array<uint8_t, 4> Bytes;
+ Size = 4;
+ if (Region.readBytes(Address, Bytes.size(), Bytes.data()) == -1) {
+ return MCDisassembler::Fail;
+ }
+ uint32_t insn =
+ llvm::support::endian::read<uint32_t, llvm::support::little,
+ llvm::support::unaligned>(Bytes.data());
+
+ // Remove parse bits.
+ insn &= ~static_cast<uint32_t>(HexagonII::InstParseBits::INST_PARSE_MASK);
+ return decodeInstruction(DecoderTable32, MI, insn, Address, this, STI);
+}