[challenge] rand

[mewmew]

"The first 90 percent of the code accounts for the first 90 percent of the development time. The remaining 10 percent of the code accounts for the other 90 percent of the development time."
— Tom Cargill, Bell Labs

To encourage the development of the final 10%, a set of challenges have been produced. This is a meta-issue to track the rand challenge of the parse-me repository.

Once these challenges have been beaten, lexing, parsing, and potentially type checking of LLVM IR assembly will have been implemented. At this point, the project is ready for an API overhaul and will welcome an open discussion with other members of the community interested in finding a clean, minimal API for interacting with LLVM IR.

Note: there will exist several, almost identical, challenge issues. The main reason for this is that the developer finds childish joy in closing issues once a challenge has been beaten :)

[mewmew]

lparse is now capable of parsing rand.ll.

u@x1 ~/D/g/s/g/m/p/rand> lparse rand.ll 
Parsing "rand.ll"
<*>@seed = global i32 1234
define i32 @abs(i32 %x) {
0:
    %1 = icmp slt i32 %x, 0
    br i1 %1, label %2, label %4
2:
    %3 = sub i32 0, %x
    br label %5
4:
    br label %5
5:
    %.0 = phi i32 [ %3, %2 ], [ %x, %4 ]
    ret i32 %.0
}
define i32 @rand() {
0:
    %1 = load i32, i32* @seed
    %2 = mul i32 22695477, %1
    %3 = add i32 %2, 1
    store i32 %3, i32* @seed
    %4 = load i32, i32* @seed
    %5 = call i32 @abs(i32 %4)
    ret i32 %5
}