1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
; We know that strcpy cannot be used to copy pointer values, because
; pointers might contain null bytes and would stop the copy. The code
; has no defined way to check for this, so DSA can know that strcpy doesn't
; require merging the input arguments.
; RUN: llvm-as < %s | opt -analyze -datastructure-gc --dsgc-abort-if-merged=A,B --dsgc-check-flags=A:ASM,B:ASR --dsgc-dspass=bu
implementation
internal void %strcpy(sbyte* %s1, sbyte* %s2) {
entry:
br label %loopentry
loopentry: ; preds = %entry, %loopentry
%cann-indvar = phi uint [ 0, %entry ], [ %next-indvar, %loopentry ] ; <uint> [#uses=2]
%cann-indvar1 = cast uint %cann-indvar to long ; <long> [#uses=2]
%s1_addr.0 = getelementptr sbyte* %s1, long %cann-indvar1 ; <sbyte*> [#uses=1]
%s2_addr.0 = getelementptr sbyte* %s2, long %cann-indvar1 ; <sbyte*> [#uses=1]
%next-indvar = add uint %cann-indvar, 1 ; <uint> [#uses=1]
%tmp.3 = load sbyte* %s2_addr.0 ; <sbyte> [#uses=2]
store sbyte %tmp.3, sbyte* %s1_addr.0
%tmp.4 = setne sbyte %tmp.3, 0 ; <bool> [#uses=1]
br bool %tmp.4, label %loopentry, label %loopexit
loopexit: ; preds = %loopentry
ret void
}
int %main() {
%A = alloca sbyte
%B = alloca sbyte
call void %strcpy(sbyte* %A, sbyte* %B)
ret int 0
}
|
