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llvm-mirror/test/Transforms/InstCombine/objsize.ll
Rafael Espindola 9f2d511fe1 Use "weak alias" instead of "alias weak" 
Before this patch we had

@a = weak global ...
but
@b = alias weak ...

The patch changes aliases to look more like global variables.

Looking at some really old code suggests that the reason was that the old
bison based parser had a reduction for alias linkages and another one for
global variable linkages. Putting the alias first avoided the reduce/reduce
conflict.

The days of the old .ll parser are long gone. The new one parses just "linkage"
and a later check is responsible for deciding if a linkage is valid in a
given context.

llvm-svn: 214355
2014-07-30 22:51:54 +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-LABEL: @foo(
; CHECK-NEXT: ret i32 60
%1 = call i32 @llvm.objectsize.i32.p0i8(i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 0), i1 false)
ret i32 %1
}
define i8* @bar() nounwind {
; CHECK-LABEL: @bar(
entry:
%retval = alloca i8*
%0 = call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @f(
; CHECK-NEXT: ret i32 0
%1 = call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @baz(
; CHECK-NEXT: objectsize
%1 = tail call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @test1(
; CHECK: objectsize.i32.p0i8
entry:
%0 = call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @test2(
; CHECK-NEXT: ret i32 34
%1 = call i32 @llvm.objectsize.i32.p0i8(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.p0i8(i8*, i1) nounwind readonly
declare i8* @__inline_memcpy_chk(i8*, i8*, i32) nounwind inlinehint
define void @test3() nounwind {
; CHECK-LABEL: @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.p0i8(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-LABEL: @test4(
entry:
%0 = alloca %struct.data, align 8
%1 = bitcast %struct.data* %0 to i8*
%2 = call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @test5(
entry:
%0 = tail call noalias i8* @malloc(i32 20) nounwind
%1 = tail call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @test6(
entry:
%0 = tail call noalias i8* @malloc(i32 20) nounwind
%1 = tail call i32 @llvm.objectsize.i32.p0i8(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-LABEL: @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.p0i8(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-LABEL: @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.p0i8(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-LABEL: @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.p0i8(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK-LABEL: @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.p0i8(i8* %call, i1 true)
; CHECK: ret i32 4
ret i32 %1
}
; CHECK-LABEL: @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.p0i8(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK-LABEL: @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.p0i8(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK-LABEL: @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.p0i8(i8* %call, i1 true)
; CHECK: ret i32 8
ret i32 %1
}
; CHECK-LABEL: @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.p0i8(i8* %select, i1 true)
%1 = tail call i32 @llvm.objectsize.i32.p0i8(i8* %select2, i1 true)
%2 = add i32 %0, %1
; CHECK: ret i32 undef
ret i32 %2
return:
ret i32 42
}
; CHECK-LABEL: @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.p0i8(i8* %gep, i1 true)
; CHECK: ret i32 undef
ret i32 %o
return:
ret i32 7
}
@globalalias = internal alias [60 x i8]* @a
; CHECK-LABEL: @test18(
; CHECK-NEXT: ret i32 60
define i32 @test18() {
%bc = bitcast [60 x i8]* @globalalias to i8*
%1 = call i32 @llvm.objectsize.i32.p0i8(i8* %bc, i1 false)
ret i32 %1
}
@globalalias2 = weak alias [60 x i8]* @a
; CHECK-LABEL: @test19(
; CHECK: llvm.objectsize
define i32 @test19() {
%bc = bitcast [60 x i8]* @globalalias2 to i8*
%1 = call i32 @llvm.objectsize.i32.p0i8(i8* %bc, i1 false)
ret i32 %1
}
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