tnum_is_const

函数名称：Returns true if @a is a known constant

函数原型：static inline bool tnum_is_const(struct tnum a)

返回类型：bool

参数：

类型	参数	名称
struct tnum	a

56

返回:非mask

**调用者**
名称	描述
print_verifier_state
register_is_const
check_stack_access
check_ctx_reg
check_tp_buffer_access
check_ptr_to_btf_access
check_mem_access	heck whether memory at (regno + off) is accessible for t = (read \| write)* if t==write, value_regno is a register which value is stored into memory* if t==read, value_regno is a register which will receive the value from memory* if t==write &&
__check_stack_boundary
check_stack_boundary	when register 'regno' is passed into function that will read 'access_size'* bytes from that pointer, make sure that it's within stack boundary* and all elements of stack are initialized
process_spin_lock	Implementation details:* bpf_map_lookup returns PTR_TO_MAP_VALUE_OR_NULL* Two bpf_map_lookups (even with the same key) will have different reg->id
check_func_arg
check_reg_sane_offset
adjust_ptr_min_max_vals	Handles arithmetic on a pointer and a scalar: computes new min/max and var_off.* Caller should also handle BPF_MOV case separately.* If we return -EACCES, caller may want to try again treating pointer as a* scalar
adjust_scalar_min_max_vals	WARNING: This function does calculations on 64-bit values, but the actual* execution may occur on 32-bit values. Therefore, things like bitshifts* need extra checks in the 32-bit case.
is_branch_taken	mpute branch direction of the expression "if (reg opcode val) goto target;"* and return:* 1 - branch will be taken and "goto target" will be executed* 0 - branch will not be taken and fall-through to next insn* -1 - unknown
check_cond_jmp_op
tnum_equals_const	Returns true if @a == tnum_const(@b)

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码