Add a couple of utility functions plus some comments.
llvm-svn: 125416
diff --git a/lldb/source/Plugins/Process/Utility/InstructionUtils.h b/lldb/source/Plugins/Process/Utility/InstructionUtils.h
index 4f59a52..e7b1446 100644
--- a/lldb/source/Plugins/Process/Utility/InstructionUtils.h
+++ b/lldb/source/Plugins/Process/Utility/InstructionUtils.h
@@ -14,6 +14,9 @@
namespace lldb_private {
+// Bits32 - Return the bit field(s) from the most significant bit (msbit) to the
+// least significant bit (lsbit) of a 32-bit unsigned value.
+//
static inline uint32_t
Bits32 (const uint32_t bits, const uint32_t msbit, const uint32_t lsbit)
{
@@ -21,12 +24,17 @@
return (bits >> lsbit) & ((1u << (msbit - lsbit + 1)) - 1);
}
+// Bit32 - Return the bit from the 'bit' position of a 32-bit unsigned value.
+//
static inline uint32_t
Bit32 (const uint32_t bits, const uint32_t bit)
{
return Bits32(bits, bit, bit);
}
+// SetBits32 - Set the bit field(s) from the most significant bit (msbit) to the
+// least significant bit (lsbit) of a 32-bit unsigned value as 'val'.
+//
static inline void
SetBits32(uint32_t &bits, const uint32_t msbit, const uint32_t lsbit, const uint32_t val)
{
@@ -36,12 +44,32 @@
bits |= (val & mask) << lsbit;
}
+// SetBit32 - Set the 'bit' position of a 32-bit unsigned value as 'val'.
+//
static inline void
SetBit32(uint32_t &bits, const uint32_t bit, const uint32_t val)
{
SetBits32(bits, bit, bit, val);
}
+// Rotr32 - Rotate a 32-bit unsigned value right by the specified amount.
+//
+static inline uint32_t
+Rotr32 (uint32_t bits, uint32_t amt)
+{
+ assert(amt < 32 && "Invalid rotate amount");
+ return (bits >> amt) | (bits << ((32-amt)&31));
+}
+
+// Rotl32 - Rotate a 32-bit unsigned value left by the specified amount.
+//
+static inline uint32_t
+Rotl32 (uint32_t bits, uint32_t amt)
+{
+ assert(amt < 32 && "Invalid rotate amount");
+ return (bits << amt) | (bits >> ((32-amt)&31));
+}
+
// Create a mask that starts at bit zero and includes "bit"
static inline uint64_t
MaskUpToBit (const uint64_t bit)