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8cec2f2816
While we have successfully implemented a funclet-oriented EH scheme on top of LLVM IR, our scheme has some notable deficiencies: - catchendpad and cleanupendpad are necessary in the current design but they are difficult to explain to others, even to seasoned LLVM experts. - catchendpad and cleanupendpad are optimization barriers. They cannot be split and force all potentially throwing call-sites to be invokes. This has a noticable effect on the quality of our code generation. - catchpad, while similar in some aspects to invoke, is fairly awkward. It is unsplittable, starts a funclet, and has control flow to other funclets. - The nesting relationship between funclets is currently a property of control flow edges. Because of this, we are forced to carefully analyze the flow graph to see if there might potentially exist illegal nesting among funclets. While we have logic to clone funclets when they are illegally nested, it would be nicer if we had a representation which forbade them upfront. Let's clean this up a bit by doing the following: - Instead, make catchpad more like cleanuppad and landingpad: no control flow, just a bunch of simple operands; catchpad would be splittable. - Introduce catchswitch, a control flow instruction designed to model the constraints of funclet oriented EH. - Make funclet scoping explicit by having funclet instructions consume the token produced by the funclet which contains them. - Remove catchendpad and cleanupendpad. Their presence can be inferred implicitly using coloring information. N.B. The state numbering code for the CLR has been updated but the veracity of it's output cannot be spoken for. An expert should take a look to make sure the results are reasonable. Reviewers: rnk, JosephTremoulet, andrew.w.kaylor Differential Revision: http://reviews.llvm.org/D15139 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255422 91177308-0d34-0410-b5e6-96231b3b80d8
220 lines
6.5 KiB
LLVM
220 lines
6.5 KiB
LLVM
; RUN: opt < %s -loop-reduce -S | FileCheck %s
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686-pc-windows-msvc"
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declare i32 @_except_handler3(...)
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declare i32 @__CxxFrameHandler3(...)
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declare void @external(i32*)
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declare void @reserve()
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define void @f() personality i32 (...)* @_except_handler3 {
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entry:
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br label %throw
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throw: ; preds = %throw, %entry
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%tmp96 = getelementptr inbounds i8, i8* undef, i32 1
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invoke void @reserve()
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to label %throw unwind label %pad
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pad: ; preds = %throw
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%phi2 = phi i8* [ %tmp96, %throw ]
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terminatepad within none [] unwind label %blah
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blah:
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%cs = catchswitch within none [label %unreachable] unwind label %blah2
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unreachable:
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catchpad within %cs []
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unreachable
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blah2:
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%cleanuppadi4.i.i.i = cleanuppad within none []
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br label %loop_body
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loop_body: ; preds = %iter, %pad
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%tmp99 = phi i8* [ %tmp101, %iter ], [ %phi2, %blah2 ]
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%tmp100 = icmp eq i8* %tmp99, undef
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br i1 %tmp100, label %unwind_out, label %iter
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iter: ; preds = %loop_body
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%tmp101 = getelementptr inbounds i8, i8* %tmp99, i32 1
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br i1 undef, label %unwind_out, label %loop_body
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unwind_out: ; preds = %iter, %loop_body
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cleanupret from %cleanuppadi4.i.i.i unwind to caller
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}
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; CHECK-LABEL: define void @f(
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; CHECK: cleanuppad within none []
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; CHECK-NEXT: ptrtoint i8* %phi2 to i32
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define void @g() personality i32 (...)* @_except_handler3 {
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entry:
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br label %throw
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throw: ; preds = %throw, %entry
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%tmp96 = getelementptr inbounds i8, i8* undef, i32 1
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invoke void @reserve()
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to label %throw unwind label %pad
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pad:
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%phi2 = phi i8* [ %tmp96, %throw ]
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%cs = catchswitch within none [label %unreachable, label %blah] unwind to caller
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unreachable:
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catchpad within %cs []
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unreachable
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blah:
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%catchpad = catchpad within %cs []
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br label %loop_body
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unwind_out:
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catchret from %catchpad to label %leave
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leave:
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ret void
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loop_body: ; preds = %iter, %pad
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%tmp99 = phi i8* [ %tmp101, %iter ], [ %phi2, %blah ]
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%tmp100 = icmp eq i8* %tmp99, undef
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br i1 %tmp100, label %unwind_out, label %iter
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iter: ; preds = %loop_body
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%tmp101 = getelementptr inbounds i8, i8* %tmp99, i32 1
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br i1 undef, label %unwind_out, label %loop_body
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}
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; CHECK-LABEL: define void @g(
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; CHECK: blah:
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; CHECK-NEXT: catchpad within %cs []
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; CHECK-NEXT: ptrtoint i8* %phi2 to i32
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define void @h() personality i32 (...)* @_except_handler3 {
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entry:
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br label %throw
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throw: ; preds = %throw, %entry
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%tmp96 = getelementptr inbounds i8, i8* undef, i32 1
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invoke void @reserve()
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to label %throw unwind label %pad
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pad:
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%cs = catchswitch within none [label %unreachable, label %blug] unwind to caller
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unreachable:
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catchpad within %cs []
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unreachable
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blug:
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%phi2 = phi i8* [ %tmp96, %pad ]
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%catchpad = catchpad within %cs []
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br label %loop_body
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unwind_out:
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catchret from %catchpad to label %leave
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leave:
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ret void
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loop_body: ; preds = %iter, %pad
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%tmp99 = phi i8* [ %tmp101, %iter ], [ %phi2, %blug ]
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%tmp100 = icmp eq i8* %tmp99, undef
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br i1 %tmp100, label %unwind_out, label %iter
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iter: ; preds = %loop_body
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%tmp101 = getelementptr inbounds i8, i8* %tmp99, i32 1
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br i1 undef, label %unwind_out, label %loop_body
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}
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; CHECK-LABEL: define void @h(
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; CHECK: blug:
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; CHECK: catchpad within %cs []
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; CHECK-NEXT: ptrtoint i8* %phi2 to i32
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define void @i() personality i32 (...)* @_except_handler3 {
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entry:
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br label %throw
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throw: ; preds = %throw, %entry
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%tmp96 = getelementptr inbounds i8, i8* undef, i32 1
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invoke void @reserve()
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to label %throw unwind label %catchpad
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catchpad: ; preds = %throw
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%phi2 = phi i8* [ %tmp96, %throw ]
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%cs = catchswitch within none [label %cp_body] unwind label %cleanuppad
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cp_body:
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catchpad within %cs []
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br label %loop_head
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cleanuppad:
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cleanuppad within none []
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br label %loop_head
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loop_head:
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br label %loop_body
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loop_body: ; preds = %iter, %catchpad
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%tmp99 = phi i8* [ %tmp101, %iter ], [ %phi2, %loop_head ]
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%tmp100 = icmp eq i8* %tmp99, undef
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br i1 %tmp100, label %unwind_out, label %iter
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iter: ; preds = %loop_body
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%tmp101 = getelementptr inbounds i8, i8* %tmp99, i32 1
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br i1 undef, label %unwind_out, label %loop_body
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unwind_out: ; preds = %iter, %loop_body
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unreachable
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}
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; CHECK-LABEL: define void @i(
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; CHECK: ptrtoint i8* %phi2 to i32
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define void @test1(i32* %b, i32* %c) personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%d.0 = phi i32* [ %b, %entry ], [ %incdec.ptr, %for.inc ]
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invoke void @external(i32* %d.0)
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to label %for.inc unwind label %catch.dispatch
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for.inc: ; preds = %for.cond
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%incdec.ptr = getelementptr inbounds i32, i32* %d.0, i32 1
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br label %for.cond
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catch.dispatch: ; preds = %for.cond
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%cs = catchswitch within none [label %catch] unwind label %catch.dispatch.2
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catch: ; preds = %catch.dispatch
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%0 = catchpad within %cs [i8* null, i32 64, i8* null]
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catchret from %0 to label %try.cont
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try.cont: ; preds = %catch
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invoke void @external(i32* %c)
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to label %try.cont.7 unwind label %catch.dispatch.2
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catch.dispatch.2: ; preds = %try.cont, %catchendblock
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%e.0 = phi i32* [ %c, %try.cont ], [ %b, %catch.dispatch ]
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%cs2 = catchswitch within none [label %catch.4] unwind to caller
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catch.4: ; preds = %catch.dispatch.2
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catchpad within %cs2 [i8* null, i32 64, i8* null]
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unreachable
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try.cont.7: ; preds = %try.cont
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ret void
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}
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; CHECK-LABEL: define void @test1(
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; CHECK: for.cond:
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; CHECK: %d.0 = phi i32* [ %b, %entry ], [ %incdec.ptr, %for.inc ]
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; CHECK: catch.dispatch.2:
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; CHECK: %e.0 = phi i32* [ %c, %try.cont ], [ %b, %catch.dispatch ]
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