115 lines
3.9 KiB
C++
115 lines
3.9 KiB
C++
//===-- InstructionUtils.h --------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef lldb_InstructionUtils_h_
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#define lldb_InstructionUtils_h_
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// Common utilities for manipulating instruction bit fields.
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namespace lldb_private {
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// Return the bit field(s) from the most significant bit (msbit) to the
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// least significant bit (lsbit) of a 64-bit unsigned value.
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static inline uint64_t Bits64(const uint64_t bits, const uint32_t msbit,
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const uint32_t lsbit) {
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assert(msbit < 64 && lsbit <= msbit);
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return (bits >> lsbit) & ((1ull << (msbit - lsbit + 1)) - 1);
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}
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// Return the bit field(s) from the most significant bit (msbit) to the
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// least significant bit (lsbit) of a 32-bit unsigned value.
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static inline uint32_t Bits32(const uint32_t bits, const uint32_t msbit,
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const uint32_t lsbit) {
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assert(msbit < 32 && lsbit <= msbit);
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return (bits >> lsbit) & ((1u << (msbit - lsbit + 1)) - 1);
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}
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// Return the bit value from the 'bit' position of a 32-bit unsigned value.
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static inline uint32_t Bit32(const uint32_t bits, const uint32_t bit) {
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return (bits >> bit) & 1u;
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}
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static inline uint64_t Bit64(const uint64_t bits, const uint32_t bit) {
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return (bits >> bit) & 1ull;
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}
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// Set the bit field(s) from the most significant bit (msbit) to the
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// least significant bit (lsbit) of a 32-bit unsigned value to 'val'.
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static inline void SetBits32(uint32_t &bits, const uint32_t msbit,
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const uint32_t lsbit, const uint32_t val) {
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assert(msbit < 32 && lsbit < 32 && msbit >= lsbit);
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uint32_t mask = ((1u << (msbit - lsbit + 1)) - 1);
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bits &= ~(mask << lsbit);
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bits |= (val & mask) << lsbit;
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}
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// Set the 'bit' position of a 32-bit unsigned value to 'val'.
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static inline void SetBit32(uint32_t &bits, const uint32_t bit,
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const uint32_t val) {
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SetBits32(bits, bit, bit, val);
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}
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// Rotate a 32-bit unsigned value right by the specified amount.
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static inline uint32_t Rotr32(uint32_t bits, uint32_t amt) {
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assert(amt < 32 && "Invalid rotate amount");
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return (bits >> amt) | (bits << ((32 - amt) & 31));
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}
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// Rotate a 32-bit unsigned value left by the specified amount.
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static inline uint32_t Rotl32(uint32_t bits, uint32_t amt) {
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assert(amt < 32 && "Invalid rotate amount");
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return (bits << amt) | (bits >> ((32 - amt) & 31));
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}
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// Create a mask that starts at bit zero and includes "bit"
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static inline uint64_t MaskUpToBit(const uint64_t bit) {
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if (bit >= 63)
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return -1ll;
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return (1ull << (bit + 1ull)) - 1ull;
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}
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// Return an integer result equal to the number of bits of x that are ones.
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static inline uint32_t BitCount(uint64_t x) {
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// c accumulates the total bits set in x
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uint32_t c;
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for (c = 0; x; ++c) {
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x &= x - 1; // clear the least significant bit set
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}
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return c;
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}
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static inline bool BitIsSet(const uint64_t value, const uint64_t bit) {
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return (value & (1ull << bit)) != 0;
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}
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static inline bool BitIsClear(const uint64_t value, const uint64_t bit) {
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return (value & (1ull << bit)) == 0;
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}
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static inline uint64_t UnsignedBits(const uint64_t value, const uint64_t msbit,
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const uint64_t lsbit) {
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uint64_t result = value >> lsbit;
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result &= MaskUpToBit(msbit - lsbit);
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return result;
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}
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static inline int64_t SignedBits(const uint64_t value, const uint64_t msbit,
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const uint64_t lsbit) {
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uint64_t result = UnsignedBits(value, msbit, lsbit);
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if (BitIsSet(value, msbit)) {
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// Sign extend
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result |= ~MaskUpToBit(msbit - lsbit);
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}
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return result;
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}
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} // namespace lldb_private
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#endif // lldb_InstructionUtils_h_
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