Hello,
I have next code:
;begin
; ModuleID = 'sample.lz'
@.str1 = internal constant [20 x i8] c"\22hello, cruel
world\22" ; <[20 x i8]*> [#uses=1]
@.str4 = internal constant [9 x i8] c"\22hello, \22" ;
<[9 x
i8]*> [#uses=1]
@.str7 = internal constant [7 x i8] c"\22heya!\22" ;
<[7 x
i8]*> [#uses=1]
declare i32 @puts(i8*)
declare i8 @strcat(i8*, i8*)
define i32 @main() {
mainBlock:
%tmp2 = getelementptr [20 x i8]* @.str1, i64 0, i64 0 ;
<i8*> [#uses=1]
%tmp3 = call i32 @puts( i8* %tmp2 ) ; <i32> [#uses=0]
%tmp5 = getelementptr [9 x i8]* @.str4, i64 0, i64 0 ;
<i8*> [#uses=1]
%tmp6 = call i32 @puts( i8* %tmp5 ) ; <i32> [#uses=0]
%tmp8 = getelementptr [7 x i8]* @.str7, i64 0, i64 0 ;
<i8*> [#uses=1]
%tmp9 = call i32 @puts( i8* %tmp8 ) ; <i32> [#uses=0]
ret i32 0
}
;end
llvm-as test.ll -o test.ll.bc
llc test.ll.bc -o test.ll.s
gcc test.ll.s -o test.ll.native
After running a see next:
whiter4bbit at LiZa /home/whiter4bbit/programming/study/yapis/liza $
./test.ll.native
"hello, cruel world""hello, ""heya!"
"hello, ""heya!"
"heya!"
It isn't a target result:) target is:
whiter4bbit at LiZa /home/whiter4bbit/programming/study/yapis/liza $
./test.ll.native
"hello, cruel world"
"hello, "
"heya!"
what is the trouble here?
I think about freeing memory after using getelementptr, is it right?(and if
it right can anybody answer 'how?')
Help me please...
Best regards, Zalunin Pavel
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On Jan 5, 2008, at 4:09 PM, Zalunin Pavel wrote:> Hello, > I have next code: > ;begin > ; ModuleID = 'sample.lz' > @.str1 = internal constant [20 x i8] c"\22hello, cruel world > \22" ; <[20 x i8]*> [#uses=1] > @.str4 = internal constant [9 x i8] c"\22hello, \22" ; < > [9 x i8]*> [#uses=1] > @.str7 = internal constant [7 x i8] c"\22heya!\22" ; < > [7 x i8]*> [#uses=1] > > declare i32 @puts(i8*)puts expects strings to be null-terminated. Compare output of llvm- gcc -emit-llvm -S -O0.> declare i8 @strcat(i8*, i8*) > > define i32 @main() { > mainBlock: > %tmp2 = getelementptr [20 x i8]* @.str1, i64 0, i64 > 0 ; <i8*> [#uses=1] > %tmp3 = call i32 @puts( i8* %tmp2 ) ; <i32> > [#uses=0] > %tmp5 = getelementptr [9 x i8]* @.str4, i64 0, i64 > 0 ; <i8*> [#uses=1] > %tmp6 = call i32 @puts( i8* %tmp5 ) ; <i32> > [#uses=0] > %tmp8 = getelementptr [7 x i8]* @.str7, i64 0, i64 > 0 ; <i8*> [#uses=1] > %tmp9 = call i32 @puts( i8* %tmp8 ) ; <i32> > [#uses=0] > ret i32 0 > } > > ;end > > llvm-as test.ll -o test.ll.bc > llc test.ll.bc -o test.ll.s > gcc test.ll.s -o test.ll.native > > After running a see next: > > whiter4bbit at LiZa /home/whiter4bbit/programming > /study/yapis/liza $ ./test.ll.native > "hello, cruel world""hello, ""heya!" > "hello, ""heya!" > "heya!" > > It isn't a target result:) target is: > > whiter4bbit at LiZa /home/whiter4bbit/programming/study/yapis/liza $ ./ > test.ll.native > "hello, cruel world" > "hello, " > "heya!" > > what is the trouble here? > I think about freeing memory after using getelementptr, is it right? > (and if it right can anybody answer 'how?') > Help me please... > > Best regards, Zalunin Pavel > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
Hi Zalunin, Try including a NULL. :) The c"foo" notation does not implicitly add one for you. Besides that, your use of getelementptr looks correct. c"\22hello, cruel world\22\00" As for freeing memory, don't free global strings. They're deliberately put in a read-only memory area initialized when the binary starts up. You can free memory that you malloc, using the instructions of the same name. Nick Zalunin Pavel wrote:> Hello, > I have next code: > ;begin > ; ModuleID = 'sample.lz' > @.str1 = internal constant [20 x i8] c"\22hello, cruel > world\22" ; <[20 x i8]*> [#uses=1] > @.str4 = internal constant [9 x i8] c"\22hello, \22" ; <[9 x > i8]*> [#uses=1] > @.str7 = internal constant [7 x i8] c"\22heya!\22" ; <[7 x > i8]*> [#uses=1]> declare i32 @puts(i8*) > > declare i8 @strcat(i8*, i8*) > > define i32 @main() { > mainBlock: > %tmp2 = getelementptr [20 x i8]* @.str1, i64 0, i64 0 > ; <i8*> [#uses=1] > %tmp3 = call i32 @puts( i8* %tmp2 ) ; <i32> [#uses=0] > %tmp5 = getelementptr [9 x i8]* @.str4, i64 0, i64 0 > ; <i8*> [#uses=1] > %tmp6 = call i32 @puts( i8* %tmp5 ) ; <i32> [#uses=0] > %tmp8 = getelementptr [7 x i8]* @.str7, i64 0, i64 0 > ; <i8*> [#uses=1] > %tmp9 = call i32 @puts( i8* %tmp8 ) ; <i32> [#uses=0] > ret i32 0 > } > > ;end > > llvm-as test.ll -o test.ll.bc > llc test.ll.bc -o test.ll.s > gcc test.ll.s -o test.ll.native > > After running a see next: > > whiter4bbit at LiZa /home/whiter4bbit/programming > /study/yapis/liza $ ./test.ll.native > "hello, cruel world""hello, ""heya!" > "hello, ""heya!" > "heya!" > > It isn't a target result:) target is: > > whiter4bbit at LiZa /home/whiter4bbit/programming/study/yapis/liza $ > ./test.ll.native > "hello, cruel world" > "hello, " > "heya!" > > what is the trouble here? > I think about freeing memory after using getelementptr, is it right?(and > if it right can anybody answer 'how?') > Help me please... > > Best regards, Zalunin Pavel