maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/Transforms/WholeProgramDevirt/devirt-single-impl-check.ll

43 lines
1.2 KiB
LLVM
Raw Normal View History

Print remarks from WholeProgramDevirt pass for each call site. Summary: It's useful to have some visibility about which call sites are devirtualized, especially for debug purposes. Another use case is a regression test on the application side (like, Chromium). Reviewers: pcc Differential Revision: http://reviews.llvm.org/D22252 llvm-svn: 275145
2016-07-12 10:38:37 +08:00
; RUN: opt -S -wholeprogramdevirt -pass-remarks=wholeprogramdevirt %s 2>&1 | FileCheck %s
IR: Introduce llvm.type.checked.load intrinsic. This intrinsic safely loads a function pointer from a virtual table pointer using type metadata. This intrinsic is used to implement control flow integrity in conjunction with virtual call optimization. The virtual call optimization pass will optimize away llvm.type.checked.load intrinsics associated with devirtualized calls, thereby removing the type check in cases where it is not needed to enforce the control flow integrity constraint. This patch also introduces the capability to copy type metadata between global variables, and teaches the virtual call optimization pass to do so. Differential Revision: http://reviews.llvm.org/D21121 llvm-svn: 273756
2016-06-25 08:23:04 +08:00
target datalayout = "e-p:64:64"
target triple = "x86_64-unknown-linux-gnu"
WholeProgramDevirt: generate more detailed and accurate remarks. Summary: Keep track of all methods for which we have devirtualized at least one call and then print them sorted alphabetically. That allows to avoid duplicates and also makes the order deterministic. Add optimization names into the remarks, so that it's easier to understand how has each method been devirtualized. Fix a bug when wrong methods could have been reported for tryVirtualConstProp. Reviewers: kcc, mehdi_amini Differential Revision: https://reviews.llvm.org/D23297 llvm-svn: 278389
2016-08-12 03:09:02 +08:00
; CHECK: remark: <unknown>:0:0: single-impl: devirtualized a call to vf
; CHECK: remark: <unknown>:0:0: devirtualized vf
; CHECK-NOT: devirtualized
Print remarks from WholeProgramDevirt pass for each call site. Summary: It's useful to have some visibility about which call sites are devirtualized, especially for debug purposes. Another use case is a regression test on the application side (like, Chromium). Reviewers: pcc Differential Revision: http://reviews.llvm.org/D22252 llvm-svn: 275145
2016-07-12 10:38:37 +08:00
IR: Introduce llvm.type.checked.load intrinsic. This intrinsic safely loads a function pointer from a virtual table pointer using type metadata. This intrinsic is used to implement control flow integrity in conjunction with virtual call optimization. The virtual call optimization pass will optimize away llvm.type.checked.load intrinsics associated with devirtualized calls, thereby removing the type check in cases where it is not needed to enforce the control flow integrity constraint. This patch also introduces the capability to copy type metadata between global variables, and teaches the virtual call optimization pass to do so. Differential Revision: http://reviews.llvm.org/D21121 llvm-svn: 273756
2016-06-25 08:23:04 +08:00
@vt1 = constant [1 x i8*] [i8* bitcast (void (i8*)* @vf to i8*)], !type !0
@vt2 = constant [1 x i8*] [i8* bitcast (void (i8*)* @vf to i8*)], !type !0
define void @vf(i8* %this) {
ret void
}
; CHECK: define void @call
define void @call(i8* %obj) {
%vtableptr = bitcast i8* %obj to [1 x i8*]**
%vtable = load [1 x i8*]*, [1 x i8*]** %vtableptr
%vtablei8 = bitcast [1 x i8*]* %vtable to i8*
%pair = call {i8*, i1} @llvm.type.checked.load(i8* %vtablei8, i32 0, metadata !"typeid")
%fptr = extractvalue {i8*, i1} %pair, 0
%p = extractvalue {i8*, i1} %pair, 1
; CHECK: br i1 true,
br i1 %p, label %cont, label %trap
cont:
%fptr_casted = bitcast i8* %fptr to void (i8*)*
; CHECK: call void @vf(
call void %fptr_casted(i8* %obj)
ret void
trap:
call void @llvm.trap()
unreachable
}
declare {i8*, i1} @llvm.type.checked.load(i8*, i32, metadata)
declare void @llvm.trap()
!0 = !{i32 0, !"typeid"}