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'''
Processes an LLVM assembly (.ll) file, adding debugging information.
You can then run the .ll file in the LLVM interpreter (lli) and
compare that to the output when compiled using emscripten.
'''
import os, sys, re
POSTAMBLE = '''
@.emscripten.autodebug.str = private constant [9 x i8] c"%d : %d\\0A\\00", align 1 ; [#uses=1]
; [#uses=1]
define void @emscripten_autodebug(i32 %line, i32 %value) {
entry:
%0 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([9 x i8]* @.emscripten.autodebug.str, i32 0, i32 0), i32 %line, i32 %value) ; [#uses=0]
br label %return
return: ; preds = %entry
ret void
}
'''
filename, ofilename = sys.argv[1], sys.argv[2]
f = open(filename, 'r')
data = f.read()
f.close()
if 'declare i32 @printf(' not in data:
POSTAMBLE += '''
; [#uses=1]
declare i32 @printf(i8*, ...)
'''
lines = data.split('\n')
for i in range(len(lines)):
#if i == 5:
# lines[i] += '\n
m = re.match(' store (?P<type>i64|i32|i16|i8) %(?P<var>[\w.]+), .*', lines[i])
if m and m.group('type') == 'i32': # TODO: Other types
lines[i] += '\n call void @emscripten_autodebug(i32 %d, i32 %%%s)' % (i+1, m.group('var'))
f = open(ofilename, 'w')
f.write('\n'.join(lines) + '\n' + POSTAMBLE + '\n')
f.close()
print 'Success.'
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