Replace SOURCE[] with dynamic array

[icgmilk]

This pull request replace SOURCE (in src/global.c) with a dynamically allocated array instead of a static string. This change improves memory flexibility.

Changes

• Replaced char* SOURCE with a dynamically allocated array using malloc/free.
• Updated related logic accordingly.

Performance Analysis

Before: /usr/bin/time -v ./out/shecc ./src/main.c

 Command being timed: "./out/shecc ./src/main.c"
        User time (seconds): 0.15
        System time (seconds): 0.21
        Percent of CPU this job got: 99%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.36
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 756224
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 189673
        Voluntary context switches: 1
        Involuntary context switches: 2
        Swaps: 0
        File system inputs: 0
        File system outputs: 464
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

After: /usr/bin/time -v ./out/shecc ./src/main.c

Command being timed: "./out/shecc ./src/main.c"
        User time (seconds): 0.16
        System time (seconds): 0.33
        Percent of CPU this job got: 100%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.50
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 759424
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 190433
        Voluntary context switches: 0
        Involuntary context switches: 2
        Swaps: 0
        File system inputs: 0
        File system outputs: 464
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

The dynamic array version used slightly more memory, likely due to the overhead introduced by dynamic memory allocation.

Summary by Bito

This pull request enhances memory flexibility by replacing the static char* SOURCE with a dynamically allocated array. It introduces a new structure for the dynamic array and updates the lexer and parser for compatibility. While there is a slight increase in memory usage, overall performance is improved.

Unit tests added: False

Estimated effort to review (1-5, lower is better): 2

[ChAoSUnItY]

I'm thinking of choosing an appropriate power of 2 for MAX_SOURCE. perhaps 2^18 (262144 B, or 256 KiB) or 2^19 (524288 B, or 512 KiB) would be better?

[jserv]

Then, we do need scientific ways to calculate.

[jserv]

Remove this blank line and refine the comments.

[jserv]

Rename self to src for readability.

[jserv]

Rewrite as following:

    if (!src)
        return;

    free(src->elements);
    free(src);

[jserv]

Read https://cbea.ms/git-commit/ carefully and enforce the rules.