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llvm-6502/test/Transforms/InstCombine/objsize.ll
Benjamin Kramer 168843c013 MemoryBuiltins: Properly guard ObjectSizeOffsetVisitor against cycles in the IR. 
The previous fix only checked for simple cycles, use a set to catch longer
cycles too.

Drop the broken check from the ObjectSizeOffsetEvaluator. The BoundsChecking
pass doesn't have to deal with invalid IR like InstCombine does.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162120 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-17 19:26:41 +00:00

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; Test a pile of objectsize bounds checking.
; RUN: opt < %s -instcombine -S | FileCheck %s
; We need target data to get the sizes of the arrays and structures.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
@a = private global [60 x i8] zeroinitializer, align 1 ; <[60 x i8]*>
@.str = private constant [8 x i8] c"abcdefg\00" ; <[8 x i8]*>
define i32 @foo() nounwind {
; CHECK: @foo
; CHECK-NEXT: ret i32 60
%1 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false)
ret i32 %1
}
define i8* @bar() nounwind {
; CHECK: @bar
entry:
%retval = alloca i8*
%0 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false)
%cmp = icmp ne i32 %0, -1
; CHECK: br i1 true
br i1 %cmp, label %cond.true, label %cond.false
cond.true:
%1 = load i8** %retval
ret i8* %1
cond.false:
%2 = load i8** %retval
ret i8* %2
}
define i32 @f() nounwind {
; CHECK: @f
; CHECK-NEXT: ret i32 0
%1 = call i32 @llvm.objectsize.i32(i8* getelementptr ([60 x i8]* @a, i32 1, i32 0), i1 false)
ret i32 %1
}
@window = external global [0 x i8]
define i1 @baz() nounwind {
; CHECK: @baz
; CHECK-NEXT: objectsize
%1 = tail call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 0), i1 false)
%2 = icmp eq i32 %1, -1
ret i1 %2
}
define void @test1(i8* %q, i32 %x) nounwind noinline {
; CHECK: @test1
; CHECK: objectsize.i32
entry:
%0 = call i32 @llvm.objectsize.i32(i8* getelementptr inbounds ([0 x i8]* @window, i32 0, i32 10), i1 false) ; <i64> [#uses=1]
%1 = icmp eq i32 %0, -1 ; <i1> [#uses=1]
br i1 %1, label %"47", label %"46"
"46": ; preds = %entry
unreachable
"47": ; preds = %entry
unreachable
}
@.str5 = private constant [9 x i32] [i32 97, i32 98, i32 99, i32 100, i32 0, i32
101, i32 102, i32 103, i32 0], align 4
define i32 @test2() nounwind {
; CHECK: @test2
; CHECK-NEXT: ret i32 34
%1 = call i32 @llvm.objectsize.i32(i8* getelementptr (i8* bitcast ([9 x i32]* @.str5 to i8*), i32 2), i1 false)
ret i32 %1
}
; rdar://7674946
@array = internal global [480 x float] zeroinitializer ; <[480 x float]*> [#uses=1]
declare i8* @__memcpy_chk(i8*, i8*, i32, i32) nounwind
declare i32 @llvm.objectsize.i32(i8*, i1) nounwind readonly
declare i8* @__inline_memcpy_chk(i8*, i8*, i32) nounwind inlinehint
define void @test3() nounwind {
; CHECK: @test3
entry:
br i1 undef, label %bb11, label %bb12
bb11:
%0 = getelementptr inbounds float* getelementptr inbounds ([480 x float]* @array, i32 0, i32 128), i32 -127 ; <float*> [#uses=1]
%1 = bitcast float* %0 to i8* ; <i8*> [#uses=1]
%2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false) ; <i32> [#uses=1]
%3 = call i8* @__memcpy_chk(i8* undef, i8* undef, i32 512, i32 %2) nounwind ; <i8*> [#uses=0]
; CHECK: unreachable
unreachable
bb12:
%4 = getelementptr inbounds float* getelementptr inbounds ([480 x float]* @array, i32 0, i32 128), i32 -127 ; <float*> [#uses=1]
%5 = bitcast float* %4 to i8* ; <i8*> [#uses=1]
%6 = call i8* @__inline_memcpy_chk(i8* %5, i8* undef, i32 512) nounwind inlinehint ; <i8*> [#uses=0]
; CHECK: @__inline_memcpy_chk
unreachable
}
; rdar://7718857
%struct.data = type { [100 x i32], [100 x i32], [1024 x i8] }
define i32 @test4(i8** %esc) nounwind ssp {
; CHECK: @test4
entry:
%0 = alloca %struct.data, align 8
%1 = bitcast %struct.data* %0 to i8*
%2 = call i32 @llvm.objectsize.i32(i8* %1, i1 false) nounwind
; CHECK-NOT: @llvm.objectsize
; CHECK: @llvm.memset.p0i8.i32(i8* %1, i8 0, i32 1824, i32 8, i1 false)
%3 = call i8* @__memset_chk(i8* %1, i32 0, i32 1824, i32 %2) nounwind
store i8* %1, i8** %esc
ret i32 0
}
; rdar://7782496
@s = external global i8*
define i8* @test5(i32 %n) nounwind ssp {
; CHECK: @test5
entry:
%0 = tail call noalias i8* @malloc(i32 20) nounwind
%1 = tail call i32 @llvm.objectsize.i32(i8* %0, i1 false)
%2 = load i8** @s, align 8
; CHECK-NOT: @llvm.objectsize
; CHECK: @llvm.memcpy.p0i8.p0i8.i32(i8* %0, i8* %1, i32 10, i32 1, i1 false)
%3 = tail call i8* @__memcpy_chk(i8* %0, i8* %2, i32 10, i32 %1) nounwind
ret i8* %0
}
define void @test6(i32 %n) nounwind ssp {
; CHECK: @test6
entry:
%0 = tail call noalias i8* @malloc(i32 20) nounwind
%1 = tail call i32 @llvm.objectsize.i32(i8* %0, i1 false)
%2 = load i8** @s, align 8
; CHECK-NOT: @llvm.objectsize
; CHECK: @__memcpy_chk(i8* %0, i8* %1, i32 30, i32 20)
%3 = tail call i8* @__memcpy_chk(i8* %0, i8* %2, i32 30, i32 %1) nounwind
ret void
}
declare i8* @__memset_chk(i8*, i32, i32, i32) nounwind
declare noalias i8* @malloc(i32) nounwind
define i32 @test7(i8** %esc) {
; CHECK: @test7
%alloc = call noalias i8* @malloc(i32 48) nounwind
store i8* %alloc, i8** %esc
%gep = getelementptr inbounds i8* %alloc, i32 16
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 false) nounwind readonly
; CHECK: ret i32 32
ret i32 %objsize
}
declare noalias i8* @calloc(i32, i32) nounwind
define i32 @test8(i8** %esc) {
; CHECK: @test8
%alloc = call noalias i8* @calloc(i32 5, i32 7) nounwind
store i8* %alloc, i8** %esc
%gep = getelementptr inbounds i8* %alloc, i32 5
%objsize = call i32 @llvm.objectsize.i32(i8* %gep, i1 false) nounwind readonly
; CHECK: ret i32 30
ret i32 %objsize
}
declare noalias i8* @strdup(i8* nocapture) nounwind
declare noalias i8* @strndup(i8* nocapture, i32) nounwind
; CHECK: @test9
define i32 @test9(i8** %esc) {
%call = tail call i8* @strdup(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0)) nounwind
store i8* %call, i8** %esc, align 8
%1 = tail call i32 @llvm.objectsize.i32(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK: @test10
define i32 @test10(i8** %esc) {
%call = tail call i8* @strndup(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0), i32 3) nounwind
store i8* %call, i8** %esc, align 8
%1 = tail call i32 @llvm.objectsize.i32(i8* %call, i1 true)
; CHECK: ret i32 4
ret i32 %1
}
; CHECK: @test11
define i32 @test11(i8** %esc) {
%call = tail call i8* @strndup(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0), i32 7) nounwind
store i8* %call, i8** %esc, align 8
%1 = tail call i32 @llvm.objectsize.i32(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK: @test12
define i32 @test12(i8** %esc) {
%call = tail call i8* @strndup(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0), i32 8) nounwind
store i8* %call, i8** %esc, align 8
%1 = tail call i32 @llvm.objectsize.i32(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK: @test13
define i32 @test13(i8** %esc) {
%call = tail call i8* @strndup(i8* getelementptr inbounds ([8 x i8]* @.str, i64 0, i64 0), i32 57) nounwind
store i8* %call, i8** %esc, align 8
%1 = tail call i32 @llvm.objectsize.i32(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK: @PR13390
define i32 @PR13390(i1 %bool, i8* %a) {
entry:
%cond = or i1 %bool, true
br i1 %cond, label %return, label %xpto
xpto:
%select = select i1 %bool, i8* %select, i8* %a
%select2 = select i1 %bool, i8* %a, i8* %select2
%0 = tail call i32 @llvm.objectsize.i32(i8* %select, i1 true)
%1 = tail call i32 @llvm.objectsize.i32(i8* %select2, i1 true)
%2 = add i32 %0, %1
; CHECK: ret i32 undef
ret i32 %2
return:
ret i32 42
}
; CHECK: @PR13621
define i32 @PR13621(i1 %bool) nounwind {
entry:
%cond = or i1 %bool, true
br i1 %cond, label %return, label %xpto
; technically reachable, but this malformed IR may appear as a result of constant propagation
xpto:
%gep2 = getelementptr i8* %gep, i32 1
%gep = getelementptr i8* %gep2, i32 1
%o = call i32 @llvm.objectsize.i32(i8* %gep, i1 true)
; CHECK: ret i32 undef
ret i32 %o
return:
ret i32 7
}
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