Lex: When the real fun begins …

I was happily debugging the test phase of building LLVM in Gentoo hardened SElinux.
Makefile, Perl, Phyton, Bash … I can mostly read through code with occasional help by google.

But Lex (*.ll) files looked like Greek to me, here’s the simplest example I could find:

; RUN: lli %s > /dev/null

@.LC0 = internal global [12 x i8] c"Hello World0"		;  [#uses=1]

declare i32 @puts(i8*)

define i32 @main() {
	%reg210 = call i32 @puts( i8* getelementptr ([12 x i8]* @.LC0, i64 0, i64 0) )		;  [#uses=0]
	ret i32 0

Ok, it’s a cool thing, a lexical analyzer for source code using regex, but … wtf !

Looking at the rest of the files, this is the Lex file to “Hello World” in C, C++, ObjC or ObjC++.
I gave up caring after that because I could patch what I was looking for.


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