derek.holloway
7502bf64a4
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185 lines
9.4 KiB
LLVM
185 lines
9.4 KiB
LLVM
;; Test recursion handling during cloning.
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;; -stats requires asserts
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; REQUIRES: asserts
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;; Original code looks like:
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;;
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;; #include <stdlib.h>
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;; #include <string.h>
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;; #include <unistd.h>
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;; __attribute((noinline)) char *D() {
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;; return new char[10];
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;; }
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;; __attribute((noinline)) char *B(int n);
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;; __attribute((noinline)) char *C(int n) {
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;; if (!n) {
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;; return D();
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;; }
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;; return B(n-1);
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;; }
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;; __attribute((noinline)) char *B(int n) {
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;; return C(n);
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;; }
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;; int main(int argc, char **argv) {
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;; char *x = B(1);
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;; char *y = B(1);
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;; char *z = B(0);
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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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;; free(x);
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;; sleep(200);
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;; free(y);
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;; free(z);
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;; return 0;
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;; }
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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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;; Check behavior when we enable cloning of contexts involved with recursive
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;; cycles, but not through the cycle itself. I.e. with full support for cloning
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;; recursive cycles off, the cloned recursive call from C back to B (line 12)
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;; will not be updated to call a clone.
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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 \
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; RUN: -pass-remarks=memprof-context-disambiguation \
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; RUN: -memprof-allow-recursive-callsites=true \
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; RUN: -memprof-clone-recursive-contexts=false \
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; RUN: %s -S 2>&1 | FileCheck %s \
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; RUN: --implicit-check-not "memprof_recursive.cc:12:10: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Bi.memprof" \
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; RUN: --check-prefix=ALL --check-prefix=ALLOW-RECUR-CALLSITES --check-prefix=ALLOW-RECUR-CONTEXTS
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;; Skipping recursive callsites should result in no cloning.
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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 \
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; RUN: -pass-remarks=memprof-context-disambiguation \
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; RUN: -memprof-allow-recursive-callsites=false \
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; RUN: %s -S 2>&1 | FileCheck %s \
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; RUN: --implicit-check-not "memprof_recursive.cc:12:10: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Bi.memprof" \
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; RUN: --implicit-check-not="created clone" \
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; RUN: --implicit-check-not="marked with memprof allocation attribute cold" \
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; RUN: --check-prefix=ALL
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;; Check the default behavior (clone recursive callsites).
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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 -stats \
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; RUN: -memprof-export-to-dot -memprof-dot-file-path-prefix=%t. \
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; RUN: -pass-remarks=memprof-context-disambiguation \
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; RUN: %s -S 2>&1 | FileCheck %s \
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; RUN: --check-prefix=ALL --check-prefix=ALLOW-RECUR-CALLSITES --check-prefix=ALLOW-RECUR-CONTEXTS \
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; RUN: --check-prefix=CLONE-RECUR-CALLSITES
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;; Check that the backedge was correctly detected and emitted to the dot file
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;; as a dotted edge.
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; RUN: cat %t.ccg.postbuild.dot | FileCheck %s --check-prefix=DOT
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; DOT-DAG: Node[[B:0x[a-f0-9]+]] {{.*}}_Z1Bi -\> _Z1Ci
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; DOT-DAG: Node[[C:0x[a-f0-9]+]] {{.*}}_Z1Ci -\> _Z1Bi
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; DOT-DAG: Node[[C]] -> Node[[B]]{{.*}}style="dotted"
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;; Skipping recursive contexts should prevent spurious call to cloned version of
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;; B from the context starting at memprof_recursive.cc:19:13, which is actually
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;; recursive (until that support is added).
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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 \
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; RUN: -pass-remarks=memprof-context-disambiguation \
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; RUN: -memprof-allow-recursive-callsites=true \
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; RUN: -memprof-allow-recursive-contexts=false \
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; RUN: -memprof-clone-recursive-contexts=false \
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; RUN: %s -S 2>&1 | FileCheck %s \
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; RUN: --implicit-check-not "memprof_recursive.cc:12:10: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Bi.memprof" \
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; RUN: --check-prefix=ALL --check-prefix=ALLOW-RECUR-CALLSITES --check-prefix=SKIP-RECUR-CONTEXTS
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:4:0: created clone _Z1Dv.memprof.1
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:8:0: created clone _Z1Ci.memprof.1
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:14:0: created clone _Z1Bi.memprof.1
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:20:13: call in clone main assigned to call function clone _Z1Bi.memprof.1
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;; We should only call the cold clone for the recursive context if we enabled
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;; recursive contexts via -memprof-allow-recursive-contexts=true (default).
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; ALLOW-RECUR-CONTEXTS: memprof_recursive.cc:19:13: call in clone main assigned to call function clone _Z1Bi.memprof.1
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; CLONE-RECUR-CALLSITES: memprof_recursive.cc:12:10: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Bi.memprof.1
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:15:10: call in clone _Z1Bi.memprof.1 assigned to call function clone _Z1Ci.memprof.1
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:10:12: call in clone _Z1Ci.memprof.1 assigned to call function clone _Z1Dv.memprof.1
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:5:10: call in clone _Z1Dv.memprof.1 marked with memprof allocation attribute cold
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;; We should call the original B for the recursive context if we have
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;; disabled recursive contexts via -memprof-allow-recursive-contexts=false.
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; SKIP-RECUR-CONTEXTS: memprof_recursive.cc:19:13: call in clone main assigned to call function clone _Z1Bi
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:12:10: call in clone _Z1Ci assigned to call function clone _Z1Bi
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:18:13: call in clone main assigned to call function clone _Z1Bi
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:15:10: call in clone _Z1Bi assigned to call function clone _Z1Ci
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; ALLOW-RECUR-CALLSITES: memprof_recursive.cc:10:12: call in clone _Z1Ci assigned to call function clone _Z1Dv
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; ALL: memprof_recursive.cc:5:10: call in clone _Z1Dv marked with memprof allocation attribute notcold
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; CLONE-RECUR-CALLSITES: 1 memprof-context-disambiguation - Number of backedges with deferred cloning
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define ptr @_Z1Dv() !dbg !3 {
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entry:
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%call = tail call ptr @_Znam(i64 10), !dbg !6, !memprof !7, !callsite !14
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ret ptr null
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}
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define ptr @_Z1Ci(i32 %n) !dbg !15 {
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entry:
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%call = tail call ptr @_Z1Dv(), !dbg !16, !callsite !17
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br label %return
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if.end: ; No predecessors!
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%call1 = tail call ptr @_Z1Bi(i32 0), !dbg !18, !callsite !19
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br label %return
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return: ; preds = %if.end, %entry
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ret ptr null
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}
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define ptr @_Z1Bi(i32 %n) !dbg !20 {
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entry:
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%call = tail call ptr @_Z1Ci(i32 0), !dbg !21, !callsite !22
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ret ptr null
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}
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define i32 @main() {
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entry:
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%call = tail call ptr @_Z1Bi(i32 0), !dbg !23, !callsite !25
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%call1 = tail call ptr @_Z1Bi(i32 0), !dbg !26, !callsite !27
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%call2 = tail call ptr @_Z1Bi(i32 0), !dbg !28, !callsite !29
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ret i32 0
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}
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declare ptr @_Znam(i64)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 20.0.0git (https://github.com/llvm/llvm-project.git 7aec6dc477f8148ed066d10dfc7a012a51b6599c)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
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!1 = !DIFile(filename: "memprof_recursive.cc", directory: ".", checksumkind: CSK_MD5, checksum: "2f15f63b187a0e0d40e7fdd18b10576a")
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!2 = !{i32 2, !"Debug Info Version", i32 3}
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!3 = distinct !DISubprogram(name: "D", linkageName: "_Z1Dv", scope: !1, file: !1, line: 4, type: !4, scopeLine: 4, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!4 = !DISubroutineType(types: !5)
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!5 = !{}
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!6 = !DILocation(line: 5, column: 10, scope: !3)
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!7 = !{!8, !10, !12}
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!8 = !{!9, !"cold"}
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!9 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 6307901912192269588}
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!10 = !{!11, !"notcold"}
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!11 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 -7155190423157709404, i64 -2954124005641725917, i64 8632435727821051414}
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!12 = !{!13, !"cold"}
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!13 = !{i64 6541423618768552252, i64 -200552803509692312, i64 -2954124005641725917, i64 -7155190423157709404, i64 -2954124005641725917, i64 -3421689549917153178}
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!14 = !{i64 6541423618768552252}
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!15 = distinct !DISubprogram(name: "C", linkageName: "_Z1Ci", scope: !1, file: !1, line: 8, type: !4, scopeLine: 8, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!16 = !DILocation(line: 10, column: 12, scope: !15)
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!17 = !{i64 -200552803509692312}
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!18 = !DILocation(line: 12, column: 10, scope: !15)
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!19 = !{i64 -7155190423157709404}
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!20 = distinct !DISubprogram(name: "B", linkageName: "_Z1Bi", scope: !1, file: !1, line: 14, type: !4, scopeLine: 14, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!21 = !DILocation(line: 15, column: 10, scope: !20)
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!22 = !{i64 -2954124005641725917}
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!23 = !DILocation(line: 18, column: 13, scope: !24)
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!24 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 17, type: !4, scopeLine: 17, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
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!25 = !{i64 8632435727821051414}
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!26 = !DILocation(line: 19, column: 13, scope: !24)
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!27 = !{i64 -3421689549917153178}
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!28 = !DILocation(line: 20, column: 13, scope: !24)
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!29 = !{i64 6307901912192269588}
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