class xf::data_analytics::text::re::RegexEngine¶

#include "xf_data_analytics/text/regex_engine.hpp"

Overview¶

Offload regex match with FPGA.

Methods¶

RegexEngine¶

RegexEngine (
    const std::string& xclbin,
    const int dev_index = 0,
    const int instr_depth = 4096,
    const int char_class_num = 128,
    const int capture_grp_num = 512,
    const int msg_size = 4096,
    const int max_slice_size = 5242880,
    const int max_slice_num = 256
    )

Default constructor for loading and programming binary.

Parameters:

xclbin	Path to FPGA binary.
dev_index	The index of Xilinx OpenCL device.
instr_depth	Max number of instructions.
char_class_num	Max number of character classes.
capture_grp_num	Max number of capturing groups.
msg_size	Max size for each message, in number of bytes. max_slice_size Max message slice size, in number of bytes.
max_slice_num	Max message slice number.

~RegexEngine¶

~RegexEngine ()

Default de-constructor for releasing program/command-queue/contect.

compile¶

ErrCode compile (std::string pattern)

Pre-compiles pattern and gives error code correspondingly.

Parameters:

pattern

Input regular expression

getCpgpNm¶

uint32_t getCpgpNm () const

Gets the number of capturing groups for current pattern.

match¶

ErrCode match (
    uint32_t total_lnm,
    const uint64_t* msg_buff,
    uint32_t* offt_buff,
    uint16_t* len_buff,
    uint32_t* out_buff
    )

Prepares configurations for RegexEngineKernel , and performs the actual matching process.

Parameters:

total_lnm	Total number of lines in current message block
msg_buff	Buffer for saving messages line-by-line, pads white-space if not hit the boundary of 64-bit
offt_buff	Buffer for saving starting address of each line, aligned with 64-bit
len_buff	Buffer for saving length of each message, in byte
out_buff	Buffer for saving output results including match flag & corresponding start/end offset address for each capturing group