1768898680
Adds an LTO option to indicate that whether we are linking with an allocator that supports hot/cold operator new interfaces. If not, at the start of the LTO backends any existing memprof hot/cold attributes are removed from the IR, and we also remove memprof metadata so that post-LTO inlining doesn't add any new attributes. This is done via setting a new flag in the module summary index. It is important to communicate via the index to the LTO backends so that distributed ThinLTO handles this correctly, as they are invoked by separate clang processes and the combined index is how we communicate information from the LTO link. Specifically, for distributed ThinLTO the LTO related processes look like: ``` # Thin link: $ lld --thinlto-index-only obj1.o ... objN.o -llib ... # ThinLTO backends: $ clang -x ir obj1.o -fthinlto-index=obj1.o.thinlto.bc -c -O2 ... $ clang -x ir objN.o -fthinlto-index=objN.o.thinlto.bc -c -O2 ``` It is during the thin link (lld --thinlto-index-only) that we have visibility into linker dependences and want to be able to pass the new option via -Wl,-supports-hot-cold-new. This will be recorded in the summary indexes created for the distributed backend processes (*.thinlto.bc) and queried from there, so that we don't need to know during those individual clang backends what allocation library was linked. Since in-process ThinLTO and regular LTO also use a combined index, for consistency we query the flag out of the index in all LTO backends. Additionally, when the LTO option is disabled, exit early from the MemProfContextDisambiguation handling performed during LTO, as this is unnecessary. Depends on D149117 and D149192. Differential Revision: https://reviews.llvm.org/D149215
432 lines
20 KiB
LLVM
432 lines
20 KiB
LLVM
;; Tests callsite context graph generation for call graph containing indirect
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;; calls. Currently this should result in conservative behavior, such that the
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;; indirect call receives a null call in its graph node, to prevent subsequent
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;; cloning. Also tests graph and IR cloning.
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;;
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;; Original code looks like:
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;;
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;; char *foo() {
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;; return new char[10];
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;; }
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;; class A {
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;; public:
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;; virtual char *x() { return foo(); }
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;; };
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;; class B : public A {
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;; public:
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;; char *x() final { return foo(); }
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;; };
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;; char *bar(A *a) {
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;; return a->x();
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;; }
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;; int main(int argc, char **argv) {
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;; char *x = foo();
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;; char *y = foo();
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;; B b;
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;; char *z = bar(&b);
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;; char *w = bar(&b);
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;; A a;
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;; char *r = bar(&a);
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;; char *s = bar(&a);
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;; memset(x, 0, 10);
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;; memset(y, 0, 10);
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;; memset(z, 0, 10);
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;; memset(w, 0, 10);
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;; memset(r, 0, 10);
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;; memset(s, 0, 10);
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;; delete[] x;
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;; delete[] w;
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;; delete[] r;
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;; sleep(10);
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;; delete[] y;
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;; delete[] z;
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;; delete[] s;
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;; return 0;
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;; }
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;;
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;; Code compiled with -mllvm -memprof-ave-lifetime-cold-threshold=5 so that the
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;; memory freed after sleep(10) results in cold lifetimes.
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;;
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;; Compiled without optimization to prevent inlining and devirtualization.
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;;
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;; The IR was then reduced using llvm-reduce with the expected FileCheck input.
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;; -stats requires asserts
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; REQUIRES: asserts
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; RUN: opt -passes=memprof-context-disambiguation -supports-hot-cold-new \
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; RUN: -memprof-verify-ccg -memprof-verify-nodes -memprof-dump-ccg \
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; RUN: -memprof-export-to-dot -memprof-dot-file-path-prefix=%t. \
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; RUN: -stats -pass-remarks=memprof-context-disambiguation \
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; RUN: %s -S 2>&1 | FileCheck %s --check-prefix=DUMP --check-prefix=IR \
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; RUN: --check-prefix=STATS --check-prefix=REMARKS
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; RUN: cat %t.ccg.postbuild.dot | FileCheck %s --check-prefix=DOT
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;; We should only create a single clone of foo, for the direct call
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;; from main allocating cold memory.
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; RUN: cat %t.ccg.cloned.dot | FileCheck %s --check-prefix=DOTCLONED
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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declare ptr @_Z3barP1A(ptr)
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define i32 @main(ptr %b, ptr %a) #0 {
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entry:
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%call = call noundef ptr @_Z3foov(), !callsite !0
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%call1 = call noundef ptr @_Z3foov(), !callsite !1
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%call2 = call noundef ptr @_Z3barP1A(ptr noundef %b), !callsite !2
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%call3 = call noundef ptr @_Z3barP1A(ptr noundef %b), !callsite !3
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%call4 = call noundef ptr @_Z3barP1A(ptr noundef %a), !callsite !4
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%call5 = call noundef ptr @_Z3barP1A(ptr noundef %a), !callsite !5
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ret i32 0
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}
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; Function Attrs: noinline
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declare void @_ZN1BC2Ev() #1
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; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
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declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2
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; Function Attrs: nobuiltin
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declare void @_ZdaPv() #3
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define internal ptr @_ZN1A1xEv() #4 {
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entry:
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%call = call noundef ptr @_Z3foov(), !callsite !6
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ret ptr null
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}
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; Function Attrs: mustprogress uwtable
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define internal ptr @_ZN1B1xEv() #5 {
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entry:
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%call = call noundef ptr @_Z3foov(), !callsite !7
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ret ptr null
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}
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; Function Attrs: mustprogress uwtable
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define internal ptr @_Z3foov() #5 {
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entry:
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%call = call noalias noundef nonnull ptr @_Znam(i64 noundef 10) #7, !memprof !8, !callsite !21
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ret ptr null
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}
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declare ptr @_Znam(i64) #6
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; uselistorder directives
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uselistorder ptr @_Z3foov, { 3, 2, 1, 0 }
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attributes #0 = { "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" }
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attributes #1 = { noinline }
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attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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attributes #3 = { nobuiltin }
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attributes #4 = { "tune-cpu"="generic" }
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attributes #5 = { mustprogress uwtable "disable-tail-calls"="true" "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
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attributes #6 = { "disable-tail-calls"="true" }
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attributes #7 = { builtin }
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!0 = !{i64 8632435727821051414}
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!1 = !{i64 -3421689549917153178}
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!2 = !{i64 6792096022461663180}
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!3 = !{i64 -2709642582978494015}
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!4 = !{i64 748269490701775343}
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!5 = !{i64 -5747251260480066785}
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!6 = !{i64 8256774051149711748}
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!7 = !{i64 -4831879094954754638}
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!8 = !{!9, !11, !13, !15, !17, !19}
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!9 = !{!10, !"notcold"}
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!10 = !{i64 2732490490862098848, i64 8256774051149711748, i64 -4820244510750103755, i64 748269490701775343}
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!11 = !{!12, !"cold"}
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!12 = !{i64 2732490490862098848, i64 8256774051149711748, i64 -4820244510750103755, i64 -5747251260480066785}
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!13 = !{!14, !"notcold"}
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!14 = !{i64 2732490490862098848, i64 8632435727821051414}
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!15 = !{!16, !"cold"}
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!16 = !{i64 2732490490862098848, i64 -4831879094954754638, i64 -4820244510750103755, i64 6792096022461663180}
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!17 = !{!18, !"notcold"}
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!18 = !{i64 2732490490862098848, i64 -4831879094954754638, i64 -4820244510750103755, i64 -2709642582978494015}
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!19 = !{!20, !"cold"}
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!20 = !{i64 2732490490862098848, i64 -3421689549917153178}
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!21 = !{i64 2732490490862098848}
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; DUMP: CCG before cloning:
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; DUMP: Callsite Context Graph:
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; DUMP: Node [[FOO:0x[a-z0-9]+]]
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; DUMP: %call = call noalias noundef nonnull ptr @_Znam(i64 noundef 10) #7 (clone 0)
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 1 2 3 4 5 6
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; DUMP: CalleeEdges:
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[AX:0x[a-z0-9]+]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: Edge from Callee [[FOO]] to Caller: [[MAIN1:0x[a-z0-9]+]] AllocTypes: NotCold ContextIds: 3
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; DUMP: Edge from Callee [[FOO]] to Caller: [[BX:0x[a-z0-9]+]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: Edge from Callee [[FOO]] to Caller: [[MAIN2:0x[a-z0-9]+]] AllocTypes: Cold ContextIds: 6
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; DUMP: Node [[AX]]
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; DUMP: %call = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 1 2
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[AX]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[AX]] to Caller: [[BAR:0x[a-z0-9]+]] AllocTypes: NotColdCold ContextIds: 1 2
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;; Bar contains an indirect call, with multiple targets. It's call should be null.
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; DUMP: Node [[BAR]]
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; DUMP: null Call
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 1 2 4 5
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[AX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: Edge from Callee [[BX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN3:0x[a-z0-9]+]] AllocTypes: NotCold ContextIds: 1
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN4:0x[a-z0-9]+]] AllocTypes: Cold ContextIds: 2
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN5:0x[a-z0-9]+]] AllocTypes: Cold ContextIds: 4
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN6:0x[a-z0-9]+]] AllocTypes: NotCold ContextIds: 5
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; DUMP: Node [[MAIN3]]
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; DUMP: %call4 = call noundef ptr @_Z3barP1A(ptr noundef %a) (clone 0)
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; DUMP: AllocTypes: NotCold
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; DUMP: ContextIds: 1
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN3]] AllocTypes: NotCold ContextIds: 1
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN4]]
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; DUMP: %call5 = call noundef ptr @_Z3barP1A(ptr noundef %a) (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 2
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN4]] AllocTypes: Cold ContextIds: 2
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN1]]
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; DUMP: %call = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: NotCold
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; DUMP: ContextIds: 3
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[MAIN1]] AllocTypes: NotCold ContextIds: 3
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; DUMP: CallerEdges:
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; DUMP: Node [[BX]]
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; DUMP: %call = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 4 5
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[BX]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[BX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: Node [[MAIN5]]
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; DUMP: %call2 = call noundef ptr @_Z3barP1A(ptr noundef %b) (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 4
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN5]] AllocTypes: Cold ContextIds: 4
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN6]]
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; DUMP: %call3 = call noundef ptr @_Z3barP1A(ptr noundef %b) (clone 0)
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; DUMP: AllocTypes: NotCold
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; DUMP: ContextIds: 5
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN6]] AllocTypes: NotCold ContextIds: 5
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN2]]
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; DUMP: %call1 = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 6
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[MAIN2]] AllocTypes: Cold ContextIds: 6
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; DUMP: CallerEdges:
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; DUMP: CCG after cloning:
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; DUMP: Callsite Context Graph:
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; DUMP: Node [[FOO]]
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; DUMP: %call = call noalias noundef nonnull ptr @_Znam(i64 noundef 10) #7 (clone 0)
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 1 2 3 4 5
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; DUMP: CalleeEdges:
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[AX]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: Edge from Callee [[FOO]] to Caller: [[BX]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: Edge from Callee [[FOO]] to Caller: [[MAIN1]] AllocTypes: NotCold ContextIds: 3
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; DUMP: Clones: [[FOO2:0x[a-z0-9]+]]
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; DUMP: Node [[AX]]
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; DUMP: %call = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 1 2
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[AX]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[AX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: Node [[BAR]]
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; DUMP: null Call
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 1 2 4 5
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[AX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 1 2
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; DUMP: Edge from Callee [[BX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN3]] AllocTypes: NotCold ContextIds: 1
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN4]] AllocTypes: Cold ContextIds: 2
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN5]] AllocTypes: Cold ContextIds: 4
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN6]] AllocTypes: NotCold ContextIds: 5
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; DUMP: Node [[MAIN3]]
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; DUMP: %call4 = call noundef ptr @_Z3barP1A(ptr noundef %a) (clone 0)
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; DUMP: AllocTypes: NotCold
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; DUMP: ContextIds: 1
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN3]] AllocTypes: NotCold ContextIds: 1
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN4]]
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; DUMP: %call5 = call noundef ptr @_Z3barP1A(ptr noundef %a) (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 2
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN4]] AllocTypes: Cold ContextIds: 2
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN1]]
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; DUMP: %call = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: NotCold
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; DUMP: ContextIds: 3
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[MAIN1]] AllocTypes: NotCold ContextIds: 3
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; DUMP: CallerEdges:
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; DUMP: Node [[BX]]
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; DUMP: %call = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: NotColdCold
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; DUMP: ContextIds: 4 5
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO]] to Caller: [[BX]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[BX]] to Caller: [[BAR]] AllocTypes: NotColdCold ContextIds: 4 5
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; DUMP: Node [[MAIN5]]
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; DUMP: %call2 = call noundef ptr @_Z3barP1A(ptr noundef %b) (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 4
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN5]] AllocTypes: Cold ContextIds: 4
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN6]]
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; DUMP: %call3 = call noundef ptr @_Z3barP1A(ptr noundef %b) (clone 0)
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; DUMP: AllocTypes: NotCold
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; DUMP: ContextIds: 5
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[BAR]] to Caller: [[MAIN6]] AllocTypes: NotCold ContextIds: 5
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; DUMP: CallerEdges:
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; DUMP: Node [[MAIN2]]
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; DUMP: %call1 = call noundef ptr @_Z3foov() (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 6
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; DUMP: CalleeEdges:
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; DUMP: Edge from Callee [[FOO2]] to Caller: [[MAIN2]] AllocTypes: Cold ContextIds: 6
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; DUMP: CallerEdges:
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; DUMP: Node [[FOO2]]
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; DUMP: %call = call noalias noundef nonnull ptr @_Znam(i64 noundef 10) #7 (clone 0)
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; DUMP: AllocTypes: Cold
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; DUMP: ContextIds: 6
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; DUMP: CalleeEdges:
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; DUMP: CallerEdges:
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; DUMP: Edge from Callee [[FOO2]] to Caller: [[MAIN2]] AllocTypes: Cold ContextIds: 6
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; DUMP: Clone of [[FOO]]
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; REMARKS: created clone _Z3foov.memprof.1
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; REMARKS: call in clone main assigned to call function clone _Z3foov.memprof.1
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; REMARKS: call in clone _Z3foov.memprof.1 marked with memprof allocation attribute cold
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; REMARKS: call in clone _ZN1A1xEv assigned to call function clone _Z3foov
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; REMARKS: call in clone _ZN1B1xEv assigned to call function clone _Z3foov
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; REMARKS: call in clone main assigned to call function clone _Z3foov
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; REMARKS: call in clone _Z3foov marked with memprof allocation attribute notcold
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; IR: define {{.*}} @main(
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; IR: call {{.*}} @_Z3foov()
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;; Only the second call to foo, which allocates cold memory via direct calls,
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;; is replaced with a call to a clone that calls a cold allocation.
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; IR: call {{.*}} @_Z3foov.memprof.1()
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; IR: call {{.*}} @_Z3barP1A(
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; IR: call {{.*}} @_Z3barP1A(
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; IR: call {{.*}} @_Z3barP1A(
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; IR: call {{.*}} @_Z3barP1A(
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; IR: define internal {{.*}} @_ZN1A1xEv(
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; IR: call {{.*}} @_Z3foov()
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; IR: define internal {{.*}} @_ZN1B1xEv(
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; IR: call {{.*}} @_Z3foov()
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; IR: define internal {{.*}} @_Z3foov()
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; IR: call {{.*}} @_Znam(i64 noundef 10) #[[NOTCOLD:[0-9]+]]
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; IR: define internal {{.*}} @_Z3foov.memprof.1()
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; IR: call {{.*}} @_Znam(i64 noundef 10) #[[COLD:[0-9]+]]
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; IR: attributes #[[NOTCOLD]] = { builtin "memprof"="notcold" }
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; IR: attributes #[[COLD]] = { builtin "memprof"="cold" }
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; STATS: 1 memprof-context-disambiguation - Number of cold static allocations (possibly cloned)
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; STATS: 1 memprof-context-disambiguation - Number of not cold static allocations (possibly cloned)
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; STATS: 1 memprof-context-disambiguation - Number of function clones created during whole program analysis
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; DOT: digraph "postbuild" {
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; DOT: label="postbuild";
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; DOT: Node[[FOO:0x[a-z0-9]+]] [shape=record,tooltip="N[[FOO]] ContextIds: 1 2 3 4 5 6",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: Alloc0\n_Z3foov -\> _Znam}"];
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; DOT: Node[[AX:0x[a-z0-9]+]] [shape=record,tooltip="N[[AX]] ContextIds: 1 2",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: 8256774051149711748\n_ZN1A1xEv -\> _Z3foov}"];
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; DOT: Node[[AX]] -> Node[[FOO]][tooltip="ContextIds: 1 2",fillcolor="mediumorchid1"];
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; DOT: Node[[BAR:0x[a-z0-9]+]] [shape=record,tooltip="N[[BAR]] ContextIds: 1 2 4 5",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: 13626499562959447861\nnull call (external)}"];
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; DOT: Node[[BAR]] -> Node[[AX]][tooltip="ContextIds: 1 2",fillcolor="mediumorchid1"];
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; DOT: Node[[BAR]] -> Node[[BX:0x[a-z0-9]+]][tooltip="ContextIds: 4 5",fillcolor="mediumorchid1"];
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; DOT: Node[[MAIN1:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN1]] ContextIds: 1",fillcolor="brown1",style="filled",style="filled",label="{OrigId: 748269490701775343\nmain -\> _Z3barP1A}"];
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; DOT: Node[[MAIN1]] -> Node[[BAR]][tooltip="ContextIds: 1",fillcolor="brown1"];
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; DOT: Node[[MAIN2:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN2]] ContextIds: 2",fillcolor="cyan",style="filled",style="filled",label="{OrigId: 12699492813229484831\nmain -\> _Z3barP1A}"];
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; DOT: Node[[MAIN2]] -> Node[[BAR]][tooltip="ContextIds: 2",fillcolor="cyan"];
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; DOT: Node[[MAIN3:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN3]] ContextIds: 3",fillcolor="brown1",style="filled",style="filled",label="{OrigId: 8632435727821051414\nmain -\> _Z3foov}"];
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; DOT: Node[[MAIN3]] -> Node[[FOO]][tooltip="ContextIds: 3",fillcolor="brown1"];
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; DOT: Node[[BX]] [shape=record,tooltip="N[[BX]] ContextIds: 4 5",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: 13614864978754796978\n_ZN1B1xEv -\> _Z3foov}"];
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; DOT: Node[[BX]] -> Node[[FOO]][tooltip="ContextIds: 4 5",fillcolor="mediumorchid1"];
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; DOT: Node[[MAIN4:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN4]] ContextIds: 4",fillcolor="cyan",style="filled",style="filled",label="{OrigId: 6792096022461663180\nmain -\> _Z3barP1A}"];
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; DOT: Node[[MAIN4]] -> Node[[BAR]][tooltip="ContextIds: 4",fillcolor="cyan"];
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; DOT: Node[[MAIN5:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN5]] ContextIds: 5",fillcolor="brown1",style="filled",style="filled",label="{OrigId: 15737101490731057601\nmain -\> _Z3barP1A}"];
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; DOT: Node[[MAIN5]] -> Node[[BAR]][tooltip="ContextIds: 5",fillcolor="brown1"];
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; DOT: Node[[MAIN6:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN6]] ContextIds: 6",fillcolor="cyan",style="filled",style="filled",label="{OrigId: 15025054523792398438\nmain -\> _Z3foov}"];
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; DOT: Node[[MAIN6]] -> Node[[FOO]][tooltip="ContextIds: 6",fillcolor="cyan"];
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; DOT: }
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; DOTCLONED: digraph "cloned" {
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; DOTCLONED: label="cloned";
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; DOTCLONED: Node[[FOO2:0x[a-z0-9]+]] [shape=record,tooltip="N[[FOO2]] ContextIds: 1 2 3 4 5",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: Alloc0\n_Z3foov -\> _Znam}"];
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; DOTCLONED: Node[[AX:0x[a-z0-9]+]] [shape=record,tooltip="N[[AX]] ContextIds: 1 2",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: 8256774051149711748\n_ZN1A1xEv -\> _Z3foov}"];
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; DOTCLONED: Node[[AX]] -> Node[[FOO2]][tooltip="ContextIds: 1 2",fillcolor="mediumorchid1"];
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; DOTCLONED: Node[[BAR:0x[a-z0-9]+]] [shape=record,tooltip="N[[BAR]] ContextIds: 1 2 4 5",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: 13626499562959447861\nnull call (external)}"];
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; DOTCLONED: Node[[BAR]] -> Node[[AX]][tooltip="ContextIds: 1 2",fillcolor="mediumorchid1"];
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; DOTCLONED: Node[[BAR]] -> Node[[BX:0x[a-z0-9]+]][tooltip="ContextIds: 4 5",fillcolor="mediumorchid1"];
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; DOTCLONED: Node[[MAIN1:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN1]] ContextIds: 1",fillcolor="brown1",style="filled",style="filled",label="{OrigId: 748269490701775343\nmain -\> _Z3barP1A}"];
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; DOTCLONED: Node[[MAIN1]] -> Node[[BAR]][tooltip="ContextIds: 1",fillcolor="brown1"];
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; DOTCLONED: Node[[MAIN2:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN2]] ContextIds: 2",fillcolor="cyan",style="filled",style="filled",label="{OrigId: 12699492813229484831\nmain -\> _Z3barP1A}"];
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; DOTCLONED: Node[[MAIN2]] -> Node[[BAR]][tooltip="ContextIds: 2",fillcolor="cyan"];
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; DOTCLONED: Node[[MAIN3:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN3]] ContextIds: 3",fillcolor="brown1",style="filled",style="filled",label="{OrigId: 8632435727821051414\nmain -\> _Z3foov}"];
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; DOTCLONED: Node[[MAIN3]] -> Node[[FOO2]][tooltip="ContextIds: 3",fillcolor="brown1"];
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; DOTCLONED: Node[[BX]] [shape=record,tooltip="N[[BX]] ContextIds: 4 5",fillcolor="mediumorchid1",style="filled",style="filled",label="{OrigId: 13614864978754796978\n_ZN1B1xEv -\> _Z3foov}"];
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; DOTCLONED: Node[[BX]] -> Node[[FOO2]][tooltip="ContextIds: 4 5",fillcolor="mediumorchid1"];
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; DOTCLONED: Node[[MAIN4:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN4]] ContextIds: 4",fillcolor="cyan",style="filled",style="filled",label="{OrigId: 6792096022461663180\nmain -\> _Z3barP1A}"];
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; DOTCLONED: Node[[MAIN4]] -> Node[[BAR]][tooltip="ContextIds: 4",fillcolor="cyan"];
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; DOTCLONED: Node[[MAIN5:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN5]] ContextIds: 5",fillcolor="brown1",style="filled",style="filled",label="{OrigId: 15737101490731057601\nmain -\> _Z3barP1A}"];
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; DOTCLONED: Node[[MAIN5]] -> Node[[BAR]][tooltip="ContextIds: 5",fillcolor="brown1"];
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; DOTCLONED: Node[[MAIN6:0x[a-z0-9]+]] [shape=record,tooltip="N[[MAIN6]] ContextIds: 6",fillcolor="cyan",style="filled",style="filled",label="{OrigId: 15025054523792398438\nmain -\> _Z3foov}"];
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; DOTCLONED: Node[[MAIN6]] -> Node[[FOO2:0x[a-z0-9]+]][tooltip="ContextIds: 6",fillcolor="cyan"];
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; DOTCLONED: Node[[FOO2]] [shape=record,tooltip="N[[FOO2]] ContextIds: 6",fillcolor="cyan",style="filled",color="blue",style="filled,bold,dashed",label="{OrigId: Alloc0\n_Z3foov -\> _Znam}"];
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; DOTCLONED: }
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