graph-deduce-tail-call.yaml
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#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d \
#RUN: | FileCheck %s -check-prefix=EMPTY
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e count \
#RUN: | FileCheck %s -check-prefix=COUNT
#
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e min \
#RUN: | FileCheck %s -check-prefix=TIME
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e med \
#RUN: | FileCheck %s -check-prefix=TIME
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e 90p \
#RUN: | FileCheck %s -check-prefix=TIME
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e 99p \
#RUN: | FileCheck %s -check-prefix=TIME
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e max \
#RUN: | FileCheck %s -check-prefix=TIME
#RUN: llvm-xray graph %s -o - -m %S/Inputs/simple-instrmap.yaml -d -e sum \
#RUN: | FileCheck %s -check-prefix=TIME
#
---
header:
version: 1
type: 0
constant-tsc: true
nonstop-tsc: true
cycle-frequency: 0
records:
# Here we reconstruct the following call trace:
#
# f1()
# f2()
# f3()
#
# But we find that we're missing an exit record for f2() because it's
# tail-called f3(). We make sure that if we see a trace like this that we can
# deduce tail calls, and account the time (potentially wrongly) to f2() when
# f1() exits. That is because we don't go back to f3()'s entry record to
# properly do the math on the timing of f2().
#
# Note that by default, tail/sibling call deduction is disabled, and is enabled
# with a flag "-d" or "-deduce-sibling-calls".
#
- { type: 0, func-id: 1, cpu: 1, thread: 111, kind: function-enter, tsc: 10000 }
- { type: 0, func-id: 2, cpu: 1, thread: 111, kind: function-enter, tsc: 10001 }
- { type: 0, func-id: 3, cpu: 1, thread: 111, kind: function-enter, tsc: 10002 }
- { type: 0, func-id: 3, cpu: 1, thread: 111, kind: function-exit, tsc: 10003 }
- { type: 0, func-id: 1, cpu: 1, thread: 111, kind: function-exit, tsc: 10004 }
...
#EMPTY: digraph xray {
#EMPTY-DAG: F0 -> F1 [label=""];
#EMPTY-DAG: F1 -> F2 [label=""];
#EMPTY-DAG: F2 -> F3 [label=""];
#EMPTY-DAG: F1 [label="@(1)"];
#EMPTY-DAG: F2 [label="@(2)"];
#EMPTY-DAG: F3 [label="@(3)"];
#EMPTY-NEXT: }
#COUNT: digraph xray {
#COUNT-DAG: F0 -> F1 [label="1"];
#COUNT-DAG: F1 -> F2 [label="1"];
#COUNT-DAG: F2 -> F3 [label="1"];
#COUNT-DAG: F1 [label="@(1)"];
#COUNT-DAG: F2 [label="@(2)"];
#COUNT-DAG: F3 [label="@(3)"];
#COUNT-NEXT: }
#TIME: digraph xray {
#TIME-DAG: F0 -> F1 [label="4.{{.*}}"];
#TIME-DAG: F1 -> F2 [label="3.{{.*}}"];
#TIME-DAG: F2 -> F3 [label="1.{{.*}}"];
#TIME-DAG: F1 [label="@(1)"];
#TIME-DAG: F2 [label="@(2)"];
#TIME-DAG: F3 [label="@(3)"];
#TIME-NEXT: }