mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-28 16:28:58 +00:00
25569f62e9
The bytes inserted before an overaligned global need to be padded according to the alignment set on the original global in order for the initializer to meet the global's alignment requirements. The previous implementation that padded to the pointer width happened to be correct for vtables on most platforms but may do the wrong thing if the vtable has a larger alignment. This issue is visible with a prototype implementation of HWASAN for globals, which will overalign all globals including vtables to 16 bytes. There is also no padding requirement for the bytes inserted after the global because they are never read from nor are they significant for alignment purposes, so stop inserting padding there. Differential Revision: https://reviews.llvm.org/D65031 llvm-svn: 366725
135 lines
5.6 KiB
LLVM
135 lines
5.6 KiB
LLVM
; RUN: opt -S -wholeprogramdevirt %s | FileCheck %s
|
|
|
|
target datalayout = "e-p:64:64"
|
|
target triple = "x86_64-unknown-linux-gnu"
|
|
|
|
; CHECK: [[VT1DATA:@[^ ]*]] = private constant { [0 x i8], [4 x i8*], [5 x i8] } { [0 x i8] zeroinitializer, [4 x i8*] [i8* null, i8* bitcast (i1 (i8*)* @vf0i1 to i8*), i8* bitcast (i1 (i8*)* @vf1i1 to i8*), i8* bitcast (i32 (i8*)* @vf1i32 to i8*)], [5 x i8] c"\01\00\00\00\01" }, !type [[T8:![0-9]+]]
|
|
@vt1 = constant [4 x i8*] [
|
|
i8* null,
|
|
i8* bitcast (i1 (i8*)* @vf0i1 to i8*),
|
|
i8* bitcast (i1 (i8*)* @vf1i1 to i8*),
|
|
i8* bitcast (i32 (i8*)* @vf1i32 to i8*)
|
|
], !type !1
|
|
|
|
; CHECK: [[VT2DATA:@[^ ]*]] = private constant { [0 x i8], [3 x i8*], [5 x i8] } { [0 x i8] zeroinitializer, [3 x i8*] [i8* bitcast (i1 (i8*)* @vf1i1 to i8*), i8* bitcast (i1 (i8*)* @vf0i1 to i8*), i8* bitcast (i32 (i8*)* @vf2i32 to i8*)], [5 x i8] c"\02\00\00\00\02" }, !type [[T0:![0-9]+]]
|
|
@vt2 = constant [3 x i8*] [
|
|
i8* bitcast (i1 (i8*)* @vf1i1 to i8*),
|
|
i8* bitcast (i1 (i8*)* @vf0i1 to i8*),
|
|
i8* bitcast (i32 (i8*)* @vf2i32 to i8*)
|
|
], !type !0
|
|
|
|
; CHECK: [[VT3DATA:@[^ ]*]] = private constant { [0 x i8], [4 x i8*], [5 x i8] } { [0 x i8] zeroinitializer, [4 x i8*] [i8* null, i8* bitcast (i1 (i8*)* @vf0i1 to i8*), i8* bitcast (i1 (i8*)* @vf1i1 to i8*), i8* bitcast (i32 (i8*)* @vf3i32 to i8*)], [5 x i8] c"\03\00\00\00\01" }, !type [[T8]]
|
|
@vt3 = constant [4 x i8*] [
|
|
i8* null,
|
|
i8* bitcast (i1 (i8*)* @vf0i1 to i8*),
|
|
i8* bitcast (i1 (i8*)* @vf1i1 to i8*),
|
|
i8* bitcast (i32 (i8*)* @vf3i32 to i8*)
|
|
], !type !1
|
|
|
|
; CHECK: [[VT4DATA:@[^ ]*]] = private constant { [0 x i8], [3 x i8*], [5 x i8] } { [0 x i8] zeroinitializer, [3 x i8*] [i8* bitcast (i1 (i8*)* @vf1i1 to i8*), i8* bitcast (i1 (i8*)* @vf0i1 to i8*), i8* bitcast (i32 (i8*)* @vf4i32 to i8*)], [5 x i8] c"\04\00\00\00\02" }, !type [[T0]]
|
|
@vt4 = constant [3 x i8*] [
|
|
i8* bitcast (i1 (i8*)* @vf1i1 to i8*),
|
|
i8* bitcast (i1 (i8*)* @vf0i1 to i8*),
|
|
i8* bitcast (i32 (i8*)* @vf4i32 to i8*)
|
|
], !type !0
|
|
|
|
; CHECK: @vt1 = alias [4 x i8*], getelementptr inbounds ({ [0 x i8], [4 x i8*], [5 x i8] }, { [0 x i8], [4 x i8*], [5 x i8] }* [[VT1DATA]], i32 0, i32 1)
|
|
; CHECK: @vt2 = alias [3 x i8*], getelementptr inbounds ({ [0 x i8], [3 x i8*], [5 x i8] }, { [0 x i8], [3 x i8*], [5 x i8] }* [[VT2DATA]], i32 0, i32 1)
|
|
; CHECK: @vt3 = alias [4 x i8*], getelementptr inbounds ({ [0 x i8], [4 x i8*], [5 x i8] }, { [0 x i8], [4 x i8*], [5 x i8] }* [[VT3DATA]], i32 0, i32 1)
|
|
; CHECK: @vt4 = alias [3 x i8*], getelementptr inbounds ({ [0 x i8], [3 x i8*], [5 x i8] }, { [0 x i8], [3 x i8*], [5 x i8] }* [[VT4DATA]], i32 0, i32 1)
|
|
|
|
define i1 @vf0i1(i8* %this) readnone {
|
|
ret i1 0
|
|
}
|
|
|
|
define i1 @vf1i1(i8* %this) readnone {
|
|
ret i1 1
|
|
}
|
|
|
|
define i32 @vf1i32(i8* %this) readnone {
|
|
ret i32 1
|
|
}
|
|
|
|
define i32 @vf2i32(i8* %this) readnone {
|
|
ret i32 2
|
|
}
|
|
|
|
define i32 @vf3i32(i8* %this) readnone {
|
|
ret i32 3
|
|
}
|
|
|
|
define i32 @vf4i32(i8* %this) readnone {
|
|
ret i32 4
|
|
}
|
|
|
|
; CHECK: define i1 @call1(
|
|
define i1 @call1(i8* %obj) {
|
|
%vtableptr = bitcast i8* %obj to [3 x i8*]**
|
|
%vtable = load [3 x i8*]*, [3 x i8*]** %vtableptr
|
|
; CHECK: {{.*}} = bitcast [3 x i8*]* {{.*}} to i8*
|
|
; CHECK: [[VT1:%[^ ]*]] = bitcast [3 x i8*]* {{.*}} to i8*
|
|
%vtablei8 = bitcast [3 x i8*]* %vtable to i8*
|
|
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
|
|
call void @llvm.assume(i1 %p)
|
|
%fptrptr = getelementptr [3 x i8*], [3 x i8*]* %vtable, i32 0, i32 0
|
|
%fptr = load i8*, i8** %fptrptr
|
|
%fptr_casted = bitcast i8* %fptr to i1 (i8*)*
|
|
; CHECK: [[VTGEP1:%[^ ]*]] = getelementptr i8, i8* [[VT1]], i32 28
|
|
; CHECK: [[VTLOAD1:%[^ ]*]] = load i8, i8* [[VTGEP1]]
|
|
; CHECK: [[VTAND1:%[^ ]*]] = and i8 [[VTLOAD1]], 2
|
|
; CHECK: [[VTCMP1:%[^ ]*]] = icmp ne i8 [[VTAND1]], 0
|
|
%result = call i1 %fptr_casted(i8* %obj)
|
|
; CHECK: ret i1 [[VTCMP1]]
|
|
ret i1 %result
|
|
}
|
|
|
|
; CHECK: define i1 @call2(
|
|
define i1 @call2(i8* %obj) {
|
|
%vtableptr = bitcast i8* %obj to [3 x i8*]**
|
|
%vtable = load [3 x i8*]*, [3 x i8*]** %vtableptr
|
|
; CHECK: {{.*}} = bitcast [3 x i8*]* {{.*}} to i8*
|
|
; CHECK: [[VT2:%[^ ]*]] = bitcast [3 x i8*]* {{.*}} to i8*
|
|
%vtablei8 = bitcast [3 x i8*]* %vtable to i8*
|
|
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
|
|
call void @llvm.assume(i1 %p)
|
|
%fptrptr = getelementptr [3 x i8*], [3 x i8*]* %vtable, i32 0, i32 1
|
|
%fptr = load i8*, i8** %fptrptr
|
|
%fptr_casted = bitcast i8* %fptr to i1 (i8*)*
|
|
; CHECK: [[VTGEP2:%[^ ]*]] = getelementptr i8, i8* [[VT2]], i32 28
|
|
; CHECK: [[VTLOAD2:%[^ ]*]] = load i8, i8* [[VTGEP2]]
|
|
; CHECK: [[VTAND2:%[^ ]*]] = and i8 [[VTLOAD2]], 1
|
|
; CHECK: [[VTCMP2:%[^ ]*]] = icmp ne i8 [[VTAND2]], 0
|
|
%result = call i1 %fptr_casted(i8* %obj)
|
|
; CHECK: ret i1 [[VTCMP2]]
|
|
ret i1 %result
|
|
}
|
|
|
|
; CHECK: define i32 @call3(
|
|
define i32 @call3(i8* %obj) {
|
|
%vtableptr = bitcast i8* %obj to [3 x i8*]**
|
|
%vtable = load [3 x i8*]*, [3 x i8*]** %vtableptr
|
|
; CHECK: {{.*}} = bitcast [3 x i8*]* {{.*}} to i8*
|
|
; CHECK: [[VT3:%[^ ]*]] = bitcast [3 x i8*]* {{.*}} to i8*
|
|
%vtablei8 = bitcast [3 x i8*]* %vtable to i8*
|
|
%p = call i1 @llvm.type.test(i8* %vtablei8, metadata !"typeid")
|
|
call void @llvm.assume(i1 %p)
|
|
%fptrptr = getelementptr [3 x i8*], [3 x i8*]* %vtable, i32 0, i32 2
|
|
%fptr = load i8*, i8** %fptrptr
|
|
%fptr_casted = bitcast i8* %fptr to i32 (i8*)*
|
|
; CHECK: [[VTGEP3:%[^ ]*]] = getelementptr i8, i8* [[VT3]], i32 24
|
|
; CHECK: [[VTBC3:%[^ ]*]] = bitcast i8* [[VTGEP3]] to i32*
|
|
; CHECK: [[VTLOAD3:%[^ ]*]] = load i32, i32* [[VTBC3]]
|
|
%result = call i32 %fptr_casted(i8* %obj)
|
|
; CHECK: ret i32 [[VTLOAD3]]
|
|
ret i32 %result
|
|
}
|
|
|
|
declare i1 @llvm.type.test(i8*, metadata)
|
|
declare void @llvm.assume(i1)
|
|
|
|
; CHECK: [[T8]] = !{i32 8, !"typeid"}
|
|
; CHECK: [[T0]] = !{i32 0, !"typeid"}
|
|
|
|
!0 = !{i32 0, !"typeid"}
|
|
!1 = !{i32 8, !"typeid"}
|