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decoder: static assert bitfield width

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This guarantees the bitfield is 5 bits, so if someone in the future
decides to shift bits around in the struct it wont break Ballistic.

Signed-off-by: Ronald Caesar <github43132@proton.me>
This commit is contained in:
Ronald Caesar
2026-01-23 18:57:09 -04:00
parent 24891bf97f
commit fd080b323c
1 changed files with 4 additions and 1 deletions
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5
include/bal_decoder.h
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@@ -19,6 +19,8 @@ extern "C"
{
#endif
#define BAL_OPERAND_BIT_WIDTH 5
/// The type of an instruction operand.
typedef enum
{
@@ -40,10 +42,11 @@ extern "C"
uint16_t bit_position : 6;
/// Bit width of the field.
uint16_t bit_width : 5;
uint16_t bit_width : BAL_OPERAND_BIT_WIDTH;
} bal_decoder_operand_t;
static_assert(2 == sizeof(bal_decoder_operand_t), "Expected operand struct to be 2 bytes.");
static_assert(5 == BAL_OPERAND_BIT_WIDTH, "Operand bit width must be less than 32 to prevent shift overflow.");
/// Represents static metadata aasociated with a specific ARM instruction.
BAL_ALIGNED(32) typedef struct