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[ThinLTO] Add option to dump per-module summary dot graph

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Summary:
I found that there currently isn't a way to invoke exportToDot from
the command line for a per-module summary index, and therefore no
testing of that case. Add an internal option and use it to test dumping
of per module summary indexes.

In particular, I am looking at fixing the limitation that causes the
aliasee GUID in the per-module summary to be 0, and want to be able to
test that change.

Reviewers: evgeny777

Subscribers: mehdi_amini, inglorion, eraman, steven_wu, dexonsmith, llvm-commits

Differential Revision: https://reviews.llvm.org/D57206

llvm-svn: 352441
This commit is contained in:
Teresa Johnson 2019-01-28 23:43:26 +00:00
parent c60736b986
commit 0c7ba752d1
2 changed files with 59 additions and 17 deletions
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14
lib/Analysis/ModuleSummaryAnalysis.cpp
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@ -70,6 +70,11 @@ cl::opt<FunctionSummary::ForceSummaryHotnessType, true> FSEC(
"all-non-critical", "All non-critical edges."),
clEnumValN(FunctionSummary::FSHT_All, "all", "All edges.")));
cl::opt<std::string> ModuleSummaryDotFile(
"module-summary-dot-file", cl::init(""), cl::Hidden,
cl::value_desc("filename"),
cl::desc("File to emit dot graph of new summary into."));
// Walk through the operands of a given User via worklist iteration and populate
// the set of GlobalValue references encountered. Invoked either on an
// Instruction or a GlobalVariable (which walks its initializer).
@ -625,6 +630,15 @@ ModuleSummaryIndex llvm::buildModuleSummaryIndex(
}
}
if (!ModuleSummaryDotFile.empty()) {
std::error_code EC;
raw_fd_ostream OSDot(ModuleSummaryDotFile, EC, sys::fs::OpenFlags::F_None);
if (EC)
report_fatal_error(Twine("Failed to open dot file ") +
ModuleSummaryDotFile + ": " + EC.message() + "\n");
Index.exportToDot(OSDot);
}
return Index;
}

62
test/ThinLTO/X86/dot-dumper.ll
View File

@ -1,5 +1,5 @@
; RUN: opt -module-summary %s -o %t1.bc
; RUN: opt -module-summary %p/Inputs/dot-dumper.ll -o %t2.bc
; RUN: opt -module-summary %s -o %t1.bc -module-summary-dot-file=%t1.dot
; RUN: opt -module-summary %p/Inputs/dot-dumper.ll -o %t2.bc -module-summary-dot-file=%t2.dot
; RUN: llvm-lto2 run -save-temps %t1.bc %t2.bc -o %t3 \
; RUN: -r=%t1.bc,main,px \
; RUN: -r=%t1.bc,main_alias,p \
@ -11,10 +11,33 @@
; RUN: -r=%t2.bc,B,p
; Never assume specific order of clusters, nodes or edges
; RUN: cat %t1.dot | FileCheck --check-prefix=STRUCTURE1 %s
; RUN: cat %t1.dot | FileCheck --check-prefix=CLUSTER0 %s
; RUN: cat %t2.dot | FileCheck --check-prefix=STRUCTURE2 %s
; RUN: cat %t2.dot | FileCheck --check-prefix=CLUSTER1 %s
; RUN: cat %t3.index.dot | FileCheck --check-prefix=STRUCTURE %s
; RUN: cat %t3.index.dot | FileCheck --check-prefix=CLUSTER0 %s
; RUN: cat %t3.index.dot | FileCheck --check-prefix=CLUSTER1 %s
; RUN: cat %t3.index.dot | FileCheck --check-prefix=CLUSTER0 --check-prefix=COMBINED0 %s
; RUN: cat %t3.index.dot | FileCheck --check-prefix=CLUSTER1 --check-prefix=COMBINED1 %s
; %t1 index
; STRUCTURE1: digraph Summary {
; STRUCTURE1: subgraph cluster_0
; STRUCTURE1: // Cross-module edges:
; STRUCTURE1: 0 [label="@0"]; // defined externally
; STRUCTURE1: M0_{{[0-9]+}} -> 0 [style=dotted]; // alias
; STRUCTURE1-DAG: [[A:[0-9]+]] [label="A"]; // defined externally
; STRUCTURE1-DAG: [[FOO:[0-9]+]] [label="foo"]; // defined externally
; STRUCTURE1-DAG: M0_{{[0-9]+}} -> [[FOO]] // call
; STRUCTURE1-DAG: M0_{{[0-9]+}} -> [[A]] [{{.*}}]; // const-ref
; STRUCTURE1-NEXT: }
; %t2 index
; STRUCTURE2: digraph Summary {
; STRUCTURE2: subgraph cluster_0
; STRUCTURE2: // Cross-module edges:
; STRUCTURE2-NEXT: }
; Combined index
; STRUCTURE: digraph Summary {
; STRUCTURE-DAG: subgraph cluster_0
; STRUCTURE-DAG: subgraph cluster_1
@ -23,23 +46,28 @@
; STRUCTURE-DAG: M0_{{[0-9]+}} -> M1_{{[0-9]+}} [{{.*}}]; // const-ref
; STRUCTURE-NEXT: }
; CLUSTER0: // Module: {{.*}}1.bc
; CLUSTER0-NEXT: subgraph cluster_0 {
; CLUSTER0-DAG: M0_[[MAIN_ALIAS:[0-9]+]] [{{.*}}main_alias{{.*}}]; // alias, dead
; CLUSTER0-DAG: M0_[[MAIN:[0-9]+]] [{{.*}}main|extern{{.*}}]; // function
; CLUSTER0: // Module: {{.*}}
; CLUSTER0-NEXT: subgraph cluster_[[ID0:[0-1]]] {
; CLUSTER0-DAG: M[[ID0]]_[[MAIN_ALIAS:[0-9]+]] [{{.*}}main_alias{{.*}}]; // alias, dead
; CLUSTER0-DAG: M[[ID0]]_[[MAIN:[0-9]+]] [{{.*}}main|extern{{.*}}]; // function
; CLUSTER0-NEXT: // Edges:
; CLUSTER0-NEXT: M0_[[MAIN_ALIAS]] -> M0_[[MAIN]] [{{.*}}]; // alias
; COMBINED0-NEXT: M[[ID0]]_[[MAIN_ALIAS]] -> M[[ID0]]_[[MAIN]] [{{.*}}]; // alias
; CLUSTER0-NEXT: }
; CLUSTER1: // Module: {{.*}}2.bc
; CLUSTER1-NEXT: subgraph cluster_1 {
; CLUSTER1-DAG: M1_[[A:[0-9]+]] [{{.*}}A|extern{{.*}}]; // variable, immutable
; CLUSTER1-DAG: M1_[[FOO:[0-9]+]] [{{.*}}foo|extern{{.*}} ffl: 00001{{.*}}]; // function
; CLUSTER1-DAG: M1_[[B:[0-9]+]] [{{.*}}B|extern{{.*}}]; // variable, immutable
; CLUSTER1-DAG: M1_[[BAR:[0-9]+]] [{{.*}}bar|extern{{.*}}]; // function, dead
; For the combined index make sure we match the second cluster.
; COMBINED1: // Module: {{.*}}1.bc
; CLUSTER1: // Module:
; COMBINED1-SAME: {{.*}}2.bc
; CLUSTER1-NEXT: subgraph cluster_[[ID1:[0-1]]] {
; CLUSTER1-DAG: M[[ID1]]_[[A:[0-9]+]] [{{.*}}A|extern{{.*}}]; // variable
; COMBINED1-SAME: , immutable
; CLUSTER1-DAG: M[[ID1]]_[[FOO:[0-9]+]] [{{.*}}foo|extern{{.*}} ffl: 00001{{.*}}]; // function
; CLUSTER1-DAG: M[[ID1]]_[[B:[0-9]+]] [{{.*}}B|extern{{.*}}]; // variable
; COMBINED1-SAME: , immutable
; CLUSTER1-DAG: M[[ID1]]_[[BAR:[0-9]+]] [{{.*}}bar|extern{{.*}}]; // function, dead
; CLUSTER1-NEXT: // Edges:
; CLUSTER1-DAG: M1_[[FOO]] -> M1_[[B]] [{{.*}}]; // const-ref
; CLUSTER1-DAG: M1_[[FOO]] -> M1_[[A]] [{{.*}}]; // const-ref
; CLUSTER1-DAG: M[[ID1]]_[[FOO]] -> M[[ID1]]_[[B]] [{{.*}}]; // const-ref
; CLUSTER1-DAG: M[[ID1]]_[[FOO]] -> M[[ID1]]_[[A]] [{{.*}}]; // const-ref
; CLUSTER1-DAG: }
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"