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SubjectRe: [PATCH v4] perf jevents: Parse metrics during conversion
Em Tue, Dec 06, 2022 at 10:10:19PM -0800, Ian Rogers escreveu:
> On Tue, Dec 6, 2022 at 9:59 PM Ian Rogers <irogers@google.com> wrote:
> >
> > Currently the 'MetricExpr' json value is passed from the json
> > file to the pmu-events.c. This change introduces an expression
> > tree that is parsed into. The parsing is done largely by using
> > operator overloading and python's 'eval' function. Two advantages
> > in doing this are:
> >
> > 1) Broken metrics fail at compile time rather than relying on
> > `perf test` to detect. `perf test` remains relevant for checking
> > event encoding and actual metric use.
> >
> > 2) The conversion to a string from the tree can minimize the metric's
> > string size, for example, preferring 1e6 over 1000000, avoiding
> > multiplication by 1 and removing unnecessary whitespace. On x86
> > this reduces the string size by 2,930bytes (0.07%).
> >
> > In future changes it would be possible to programmatically
> > generate the json expressions (a single line of text and so a
> > pain to write manually) for an architecture using the expression
> > tree. This could avoid copy-pasting metrics for all architecture
> > variants.
> >
> > Signed-off-by: Ian Rogers <irogers@google.com>
> >
> > v4. Doesn't simplify "0*SLOTS" to 0, as the pattern is used to fix
> > Intel metrics with topdown events.
>
> Just noticed Arnaldo took v3:
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/commit/?h=tmp.perf/core&id=b4a8116e53023a6d4edc24a3252a845d203dd119
> So I'll post the Intel slots fix separately.

tmp.perf/core stuff can be replaced, I'll replace v3 with v4 there.

Thanks!

- Arnaldo

> Thanks,
> Ian
>
> > v3. Avoids generic types on standard types like set that aren't
> > supported until Python 3.9, fixing an issue with Python 3.6
> > reported-by John Garry. v3 also fixes minor pylint issues and adds
> > a call to Simplify on the read expression tree.
> > v2. Improvements to type information.
> > ---
> > tools/perf/pmu-events/Build | 2 +-
> > tools/perf/pmu-events/jevents.py | 12 +-
> > tools/perf/pmu-events/metric.py | 501 +++++++++++++++++++++++++++
> > tools/perf/pmu-events/metric_test.py | 153 ++++++++
> > 4 files changed, 664 insertions(+), 4 deletions(-)
> > create mode 100644 tools/perf/pmu-events/metric.py
> > create mode 100644 tools/perf/pmu-events/metric_test.py
> >
> > diff --git a/tools/perf/pmu-events/Build b/tools/perf/pmu-events/Build
> > index 04ef95174660..15b9e8fdbffa 100644
> > --- a/tools/perf/pmu-events/Build
> > +++ b/tools/perf/pmu-events/Build
> > @@ -21,7 +21,7 @@ $(OUTPUT)pmu-events/pmu-events.c: pmu-events/empty-pmu-events.c
> > $(call rule_mkdir)
> > $(Q)$(call echo-cmd,gen)cp $< $@
> > else
> > -$(OUTPUT)pmu-events/pmu-events.c: $(JSON) $(JSON_TEST) $(JEVENTS_PY)
> > +$(OUTPUT)pmu-events/pmu-events.c: $(JSON) $(JSON_TEST) $(JEVENTS_PY) pmu-events/metric.py
> > $(call rule_mkdir)
> > $(Q)$(call echo-cmd,gen)$(PYTHON) $(JEVENTS_PY) $(JEVENTS_ARCH) pmu-events/arch $@
> > endif
> > diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
> > index 0daa3e007528..4c398e0eeb2f 100755
> > --- a/tools/perf/pmu-events/jevents.py
> > +++ b/tools/perf/pmu-events/jevents.py
> > @@ -4,6 +4,7 @@
> > import argparse
> > import csv
> > import json
> > +import metric
> > import os
> > import sys
> > from typing import (Callable, Dict, Optional, Sequence, Set, Tuple)
> > @@ -268,9 +269,10 @@ class JsonEvent:
> > self.metric_name = jd.get('MetricName')
> > self.metric_group = jd.get('MetricGroup')
> > self.metric_constraint = jd.get('MetricConstraint')
> > - self.metric_expr = jd.get('MetricExpr')
> > - if self.metric_expr:
> > - self.metric_expr = self.metric_expr.replace('\\', '\\\\')
> > + self.metric_expr = None
> > + if 'MetricExpr' in jd:
> > + self.metric_expr = metric.ParsePerfJson(jd['MetricExpr']).Simplify()
> > +
> > arch_std = jd.get('ArchStdEvent')
> > if precise and self.desc and '(Precise Event)' not in self.desc:
> > extra_desc += ' (Must be precise)' if precise == '2' else (' (Precise '
> > @@ -322,6 +324,10 @@ class JsonEvent:
> > s = ''
> > for attr in _json_event_attributes:
> > x = getattr(self, attr)
> > + if x and attr == 'metric_expr':
> > + # Convert parsed metric expressions into a string. Slashes
> > + # must be doubled in the file.
> > + x = x.ToPerfJson().replace('\\', '\\\\')
> > s += f'{x}\\000' if x else '\\000'
> > return s
> >
> > diff --git a/tools/perf/pmu-events/metric.py b/tools/perf/pmu-events/metric.py
> > new file mode 100644
> > index 000000000000..cc451a265751
> > --- /dev/null
> > +++ b/tools/perf/pmu-events/metric.py
> > @@ -0,0 +1,501 @@
> > +# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
> > +"""Parse or generate representations of perf metrics."""
> > +import ast
> > +import decimal
> > +import json
> > +import re
> > +from typing import Dict, List, Optional, Set, Union
> > +
> > +
> > +class Expression:
> > + """Abstract base class of elements in a metric expression."""
> > +
> > + def ToPerfJson(self) -> str:
> > + """Returns a perf json file encoded representation."""
> > + raise NotImplementedError()
> > +
> > + def ToPython(self) -> str:
> > + """Returns a python expr parseable representation."""
> > + raise NotImplementedError()
> > +
> > + def Simplify(self):
> > + """Returns a simplified version of self."""
> > + raise NotImplementedError()
> > +
> > + def Equals(self, other) -> bool:
> > + """Returns true when two expressions are the same."""
> > + raise NotImplementedError()
> > +
> > + def __str__(self) -> str:
> > + return self.ToPerfJson()
> > +
> > + def __or__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('|', self, other)
> > +
> > + def __ror__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('|', other, self)
> > +
> > + def __xor__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('^', self, other)
> > +
> > + def __and__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('&', self, other)
> > +
> > + def __lt__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('<', self, other)
> > +
> > + def __gt__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('>', self, other)
> > +
> > + def __add__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('+', self, other)
> > +
> > + def __radd__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('+', other, self)
> > +
> > + def __sub__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('-', self, other)
> > +
> > + def __rsub__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('-', other, self)
> > +
> > + def __mul__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('*', self, other)
> > +
> > + def __rmul__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('*', other, self)
> > +
> > + def __truediv__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('/', self, other)
> > +
> > + def __rtruediv__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('/', other, self)
> > +
> > + def __mod__(self, other: Union[int, float, 'Expression']) -> 'Operator':
> > + return Operator('%', self, other)
> > +
> > +
> > +def _Constify(val: Union[bool, int, float, Expression]) -> Expression:
> > + """Used to ensure that the nodes in the expression tree are all Expression."""
> > + if isinstance(val, bool):
> > + return Constant(1 if val else 0)
> > + if isinstance(val, (int, float)):
> > + return Constant(val)
> > + return val
> > +
> > +
> > +# Simple lookup for operator precedence, used to avoid unnecessary
> > +# brackets. Precedence matches that of python and the simple expression parser.
> > +_PRECEDENCE = {
> > + '|': 0,
> > + '^': 1,
> > + '&': 2,
> > + '<': 3,
> > + '>': 3,
> > + '+': 4,
> > + '-': 4,
> > + '*': 5,
> > + '/': 5,
> > + '%': 5,
> > +}
> > +
> > +
> > +class Operator(Expression):
> > + """Represents a binary operator in the parse tree."""
> > +
> > + def __init__(self, operator: str, lhs: Union[int, float, Expression],
> > + rhs: Union[int, float, Expression]):
> > + self.operator = operator
> > + self.lhs = _Constify(lhs)
> > + self.rhs = _Constify(rhs)
> > +
> > + def Bracket(self,
> > + other: Expression,
> > + other_str: str,
> > + rhs: bool = False) -> str:
> > + """If necessary brackets the given other value.
> > +
> > + If ``other`` is an operator then a bracket is necessary when
> > + this/self operator has higher precedence. Consider: '(a + b) * c',
> > + ``other_str`` will be 'a + b'. A bracket is necessary as without
> > + the bracket 'a + b * c' will evaluate 'b * c' first. However, '(a
> > + * b) + c' doesn't need a bracket as 'a * b' will always be
> > + evaluated first. For 'a / (b * c)' (ie the same precedence level
> > + operations) then we add the bracket to best match the original
> > + input, but not for '(a / b) * c' where the bracket is unnecessary.
> > +
> > + Args:
> > + other (Expression): is a lhs or rhs operator
> > + other_str (str): ``other`` in the appropriate string form
> > + rhs (bool): is ``other`` on the RHS
> > +
> > + Returns:
> > + str: possibly bracketed other_str
> > + """
> > + if isinstance(other, Operator):
> > + if _PRECEDENCE.get(self.operator, -1) > _PRECEDENCE.get(
> > + other.operator, -1):
> > + return f'({other_str})'
> > + if rhs and _PRECEDENCE.get(self.operator, -1) == _PRECEDENCE.get(
> > + other.operator, -1):
> > + return f'({other_str})'
> > + return other_str
> > +
> > + def ToPerfJson(self):
> > + return (f'{self.Bracket(self.lhs, self.lhs.ToPerfJson())} {self.operator} '
> > + f'{self.Bracket(self.rhs, self.rhs.ToPerfJson(), True)}')
> > +
> > + def ToPython(self):
> > + return (f'{self.Bracket(self.lhs, self.lhs.ToPython())} {self.operator} '
> > + f'{self.Bracket(self.rhs, self.rhs.ToPython(), True)}')
> > +
> > + def Simplify(self) -> Expression:
> > + lhs = self.lhs.Simplify()
> > + rhs = self.rhs.Simplify()
> > + if isinstance(lhs, Constant) and isinstance(rhs, Constant):
> > + return Constant(ast.literal_eval(lhs + self.operator + rhs))
> > +
> > + if isinstance(self.lhs, Constant):
> > + if self.operator in ('+', '|') and lhs.value == '0':
> > + return rhs
> > +
> > + # Simplify multiplication by 0 except for the slot event which
> > + # is deliberately introduced using this pattern.
> > + if self.operator == '*' and lhs.value == '0' and (
> > + not isinstance(rhs, Event) or 'slots' not in rhs.name.lower()):
> > + return Constant(0)
> > +
> > + if self.operator == '*' and lhs.value == '1':
> > + return rhs
> > +
> > + if isinstance(rhs, Constant):
> > + if self.operator in ('+', '|') and rhs.value == '0':
> > + return lhs
> > +
> > + if self.operator == '*' and rhs.value == '0':
> > + return Constant(0)
> > +
> > + if self.operator == '*' and self.rhs.value == '1':
> > + return lhs
> > +
> > + return Operator(self.operator, lhs, rhs)
> > +
> > + def Equals(self, other: Expression) -> bool:
> > + if isinstance(other, Operator):
> > + return self.operator == other.operator and self.lhs.Equals(
> > + other.lhs) and self.rhs.Equals(other.rhs)
> > + return False
> > +
> > +
> > +class Select(Expression):
> > + """Represents a select ternary in the parse tree."""
> > +
> > + def __init__(self, true_val: Union[int, float, Expression],
> > + cond: Union[int, float, Expression],
> > + false_val: Union[int, float, Expression]):
> > + self.true_val = _Constify(true_val)
> > + self.cond = _Constify(cond)
> > + self.false_val = _Constify(false_val)
> > +
> > + def ToPerfJson(self):
> > + true_str = self.true_val.ToPerfJson()
> > + cond_str = self.cond.ToPerfJson()
> > + false_str = self.false_val.ToPerfJson()
> > + return f'({true_str} if {cond_str} else {false_str})'
> > +
> > + def ToPython(self):
> > + return (f'Select({self.true_val.ToPython()}, {self.cond.ToPython()}, '
> > + f'{self.false_val.ToPython()})')
> > +
> > + def Simplify(self) -> Expression:
> > + cond = self.cond.Simplify()
> > + true_val = self.true_val.Simplify()
> > + false_val = self.false_val.Simplify()
> > + if isinstance(cond, Constant):
> > + return false_val if cond.value == '0' else true_val
> > +
> > + if true_val.Equals(false_val):
> > + return true_val
> > +
> > + return Select(true_val, cond, false_val)
> > +
> > + def Equals(self, other: Expression) -> bool:
> > + if isinstance(other, Select):
> > + return self.cond.Equals(other.cond) and self.false_val.Equals(
> > + other.false_val) and self.true_val.Equals(other.true_val)
> > + return False
> > +
> > +
> > +class Function(Expression):
> > + """A function in an expression like min, max, d_ratio."""
> > +
> > + def __init__(self,
> > + fn: str,
> > + lhs: Union[int, float, Expression],
> > + rhs: Optional[Union[int, float, Expression]] = None):
> > + self.fn = fn
> > + self.lhs = _Constify(lhs)
> > + self.rhs = _Constify(rhs)
> > +
> > + def ToPerfJson(self):
> > + if self.rhs:
> > + return f'{self.fn}({self.lhs.ToPerfJson()}, {self.rhs.ToPerfJson()})'
> > + return f'{self.fn}({self.lhs.ToPerfJson()})'
> > +
> > + def ToPython(self):
> > + if self.rhs:
> > + return f'{self.fn}({self.lhs.ToPython()}, {self.rhs.ToPython()})'
> > + return f'{self.fn}({self.lhs.ToPython()})'
> > +
> > + def Simplify(self) -> Expression:
> > + lhs = self.lhs.Simplify()
> > + rhs = self.rhs.Simplify() if self.rhs else None
> > + if isinstance(lhs, Constant) and isinstance(rhs, Constant):
> > + if self.fn == 'd_ratio':
> > + if rhs.value == '0':
> > + return Constant(0)
> > + Constant(ast.literal_eval(f'{lhs} / {rhs}'))
> > + return Constant(ast.literal_eval(f'{self.fn}({lhs}, {rhs})'))
> > +
> > + return Function(self.fn, lhs, rhs)
> > +
> > + def Equals(self, other: Expression) -> bool:
> > + if isinstance(other, Function):
> > + return self.fn == other.fn and self.lhs.Equals(
> > + other.lhs) and self.rhs.Equals(other.rhs)
> > + return False
> > +
> > +
> > +def _FixEscapes(s: str) -> str:
> > + s = re.sub(r'([^\\]),', r'\1\\,', s)
> > + return re.sub(r'([^\\])=', r'\1\\=', s)
> > +
> > +
> > +class Event(Expression):
> > + """An event in an expression."""
> > +
> > + def __init__(self, name: str, legacy_name: str = ''):
> > + self.name = _FixEscapes(name)
> > + self.legacy_name = _FixEscapes(legacy_name)
> > +
> > + def ToPerfJson(self):
> > + result = re.sub('/', '@', self.name)
> > + return result
> > +
> > + def ToPython(self):
> > + return f'Event(r"{self.name}")'
> > +
> > + def Simplify(self) -> Expression:
> > + return self
> > +
> > + def Equals(self, other: Expression) -> bool:
> > + return isinstance(other, Event) and self.name == other.name
> > +
> > +
> > +class Constant(Expression):
> > + """A constant within the expression tree."""
> > +
> > + def __init__(self, value: Union[float, str]):
> > + ctx = decimal.Context()
> > + ctx.prec = 20
> > + dec = ctx.create_decimal(repr(value) if isinstance(value, float) else value)
> > + self.value = dec.normalize().to_eng_string()
> > + self.value = self.value.replace('+', '')
> > + self.value = self.value.replace('E', 'e')
> > +
> > + def ToPerfJson(self):
> > + return self.value
> > +
> > + def ToPython(self):
> > + return f'Constant({self.value})'
> > +
> > + def Simplify(self) -> Expression:
> > + return self
> > +
> > + def Equals(self, other: Expression) -> bool:
> > + return isinstance(other, Constant) and self.value == other.value
> > +
> > +
> > +class Literal(Expression):
> > + """A runtime literal within the expression tree."""
> > +
> > + def __init__(self, value: str):
> > + self.value = value
> > +
> > + def ToPerfJson(self):
> > + return self.value
> > +
> > + def ToPython(self):
> > + return f'Literal({self.value})'
> > +
> > + def Simplify(self) -> Expression:
> > + return self
> > +
> > + def Equals(self, other: Expression) -> bool:
> > + return isinstance(other, Literal) and self.value == other.value
> > +
> > +
> > +def min(lhs: Union[int, float, Expression], rhs: Union[int, float,
> > + Expression]) -> Function:
> > + # pylint: disable=redefined-builtin
> > + # pylint: disable=invalid-name
> > + return Function('min', lhs, rhs)
> > +
> > +
> > +def max(lhs: Union[int, float, Expression], rhs: Union[int, float,
> > + Expression]) -> Function:
> > + # pylint: disable=redefined-builtin
> > + # pylint: disable=invalid-name
> > + return Function('max', lhs, rhs)
> > +
> > +
> > +def d_ratio(lhs: Union[int, float, Expression],
> > + rhs: Union[int, float, Expression]) -> Function:
> > + # pylint: disable=redefined-builtin
> > + # pylint: disable=invalid-name
> > + return Function('d_ratio', lhs, rhs)
> > +
> > +
> > +def source_count(event: Event) -> Function:
> > + # pylint: disable=redefined-builtin
> > + # pylint: disable=invalid-name
> > + return Function('source_count', event)
> > +
> > +
> > +class Metric:
> > + """An individual metric that will specifiable on the perf command line."""
> > + groups: Set[str]
> > + expr: Expression
> > + scale_unit: str
> > + constraint: bool
> > +
> > + def __init__(self,
> > + name: str,
> > + description: str,
> > + expr: Expression,
> > + scale_unit: str,
> > + constraint: bool = False):
> > + self.name = name
> > + self.description = description
> > + self.expr = expr.Simplify()
> > + # Workraound valid_only_metric hiding certain metrics based on unit.
> > + scale_unit = scale_unit.replace('/sec', ' per sec')
> > + if scale_unit[0].isdigit():
> > + self.scale_unit = scale_unit
> > + else:
> > + self.scale_unit = f'1{scale_unit}'
> > + self.constraint = constraint
> > + self.groups = set()
> > +
> > + def __lt__(self, other):
> > + """Sort order."""
> > + return self.name < other.name
> > +
> > + def AddToMetricGroup(self, group):
> > + """Callback used when being added to a MetricGroup."""
> > + self.groups.add(group.name)
> > +
> > + def Flatten(self) -> Set['Metric']:
> > + """Return a leaf metric."""
> > + return set([self])
> > +
> > + def ToPerfJson(self) -> Dict[str, str]:
> > + """Return as dictionary for Json generation."""
> > + result = {
> > + 'MetricName': self.name,
> > + 'MetricGroup': ';'.join(sorted(self.groups)),
> > + 'BriefDescription': self.description,
> > + 'MetricExpr': self.expr.ToPerfJson(),
> > + 'ScaleUnit': self.scale_unit
> > + }
> > + if self.constraint:
> > + result['MetricConstraint'] = 'NO_NMI_WATCHDOG'
> > +
> > + return result
> > +
> > +
> > +class _MetricJsonEncoder(json.JSONEncoder):
> > + """Special handling for Metric objects."""
> > +
> > + def default(self, o):
> > + if isinstance(o, Metric):
> > + return o.ToPerfJson()
> > + return json.JSONEncoder.default(self, o)
> > +
> > +
> > +class MetricGroup:
> > + """A group of metrics.
> > +
> > + Metric groups may be specificd on the perf command line, but within
> > + the json they aren't encoded. Metrics may be in multiple groups
> > + which can facilitate arrangements similar to trees.
> > + """
> > +
> > + def __init__(self, name: str, metric_list: List[Union[Metric,
> > + 'MetricGroup']]):
> > + self.name = name
> > + self.metric_list = metric_list
> > + for metric in metric_list:
> > + metric.AddToMetricGroup(self)
> > +
> > + def AddToMetricGroup(self, group):
> > + """Callback used when a MetricGroup is added into another."""
> > + for metric in self.metric_list:
> > + metric.AddToMetricGroup(group)
> > +
> > + def Flatten(self) -> Set[Metric]:
> > + """Returns a set of all leaf metrics."""
> > + result = set()
> > + for x in self.metric_list:
> > + result = result.union(x.Flatten())
> > +
> > + return result
> > +
> > + def ToPerfJson(self) -> str:
> > + return json.dumps(sorted(self.Flatten()), indent=2, cls=_MetricJsonEncoder)
> > +
> > + def __str__(self) -> str:
> > + return self.ToPerfJson()
> > +
> > +
> > +class _RewriteIfExpToSelect(ast.NodeTransformer):
> > +
> > + def visit_IfExp(self, node):
> > + # pylint: disable=invalid-name
> > + call = ast.Call(
> > + func=ast.Name(id='Select', ctx=ast.Load()),
> > + args=[node.body, node.test, node.orelse],
> > + keywords=[])
> > + ast.copy_location(call, node.test)
> > + return call
> > +
> > +
> > +def ParsePerfJson(orig: str) -> Expression:
> > + """A simple json metric expression decoder.
> > +
> > + Converts a json encoded metric expression by way of python's ast and
> > + eval routine. First tokens are mapped to Event calls, then
> > + accidentally converted keywords or literals are mapped to their
> > + appropriate calls. Python's ast is used to match if-else that can't
> > + be handled via operator overloading. Finally the ast is evaluated.
> > +
> > + Args:
> > + orig (str): String to parse.
> > +
> > + Returns:
> > + Expression: The parsed string.
> > + """
> > + # pylint: disable=eval-used
> > + py = orig.strip()
> > + py = re.sub(r'([a-zA-Z][^-+/\* \\\(\),]*(?:\\.[^-+/\* \\\(\),]*)*)',
> > + r'Event(r"\1")', py)
> > + py = re.sub(r'#Event\(r"([^"]*)"\)', r'Literal("#\1")', py)
> > + py = re.sub(r'([0-9]+)Event\(r"(e[0-9]+)"\)', r'\1\2', py)
> > + keywords = ['if', 'else', 'min', 'max', 'd_ratio', 'source_count']
> > + for kw in keywords:
> > + py = re.sub(rf'Event\(r"{kw}"\)', kw, py)
> > +
> > + parsed = ast.parse(py, mode='eval')
> > + _RewriteIfExpToSelect().visit(parsed)
> > + parsed = ast.fix_missing_locations(parsed)
> > + return _Constify(eval(compile(parsed, orig, 'eval')))
> > diff --git a/tools/perf/pmu-events/metric_test.py b/tools/perf/pmu-events/metric_test.py
> > new file mode 100644
> > index 000000000000..4741b7b6612d
> > --- /dev/null
> > +++ b/tools/perf/pmu-events/metric_test.py
> > @@ -0,0 +1,153 @@
> > +# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
> > +import unittest
> > +from metric import Constant
> > +from metric import Event
> > +from metric import ParsePerfJson
> > +
> > +
> > +class TestMetricExpressions(unittest.TestCase):
> > +
> > + def test_Operators(self):
> > + a = Event('a')
> > + b = Event('b')
> > + self.assertEqual((a | b).ToPerfJson(), 'a | b')
> > + self.assertEqual((a ^ b).ToPerfJson(), 'a ^ b')
> > + self.assertEqual((a & b).ToPerfJson(), 'a & b')
> > + self.assertEqual((a < b).ToPerfJson(), 'a < b')
> > + self.assertEqual((a > b).ToPerfJson(), 'a > b')
> > + self.assertEqual((a + b).ToPerfJson(), 'a + b')
> > + self.assertEqual((a - b).ToPerfJson(), 'a - b')
> > + self.assertEqual((a * b).ToPerfJson(), 'a * b')
> > + self.assertEqual((a / b).ToPerfJson(), 'a / b')
> > + self.assertEqual((a % b).ToPerfJson(), 'a % b')
> > + one = Constant(1)
> > + self.assertEqual((a + one).ToPerfJson(), 'a + 1')
> > +
> > + def test_Brackets(self):
> > + a = Event('a')
> > + b = Event('b')
> > + c = Event('c')
> > + self.assertEqual((a * b + c).ToPerfJson(), 'a * b + c')
> > + self.assertEqual((a + b * c).ToPerfJson(), 'a + b * c')
> > + self.assertEqual(((a + a) + a).ToPerfJson(), 'a + a + a')
> > + self.assertEqual(((a + b) * c).ToPerfJson(), '(a + b) * c')
> > + self.assertEqual((a + (b * c)).ToPerfJson(), 'a + b * c')
> > + self.assertEqual(((a / b) * c).ToPerfJson(), 'a / b * c')
> > + self.assertEqual((a / (b * c)).ToPerfJson(), 'a / (b * c)')
> > +
> > + def test_ParsePerfJson(self):
> > + # Based on an example of a real metric.
> > + before = '(a + b + c + d) / (2 * e)'
> > + after = before
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + # Parsing should handle events with '-' in their name. Note, in
> > + # the json file the '\' are doubled to '\\'.
> > + before = r'topdown\-fe\-bound / topdown\-slots - 1'
> > + after = before
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + # Parsing should handle escaped modifiers. Note, in the json file
> > + # the '\' are doubled to '\\'.
> > + before = r'arb@event\=0x81\,umask\=0x1@ + arb@event\=0x84\,umask\=0x1@'
> > + after = before
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + # Parsing should handle exponents in numbers.
> > + before = r'a + 1e12 + b'
> > + after = before
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + def test_IfElseTests(self):
> > + # if-else needs rewriting to Select and back.
> > + before = r'Event1 if #smt_on else Event2'
> > + after = f'({before})'
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + before = r'Event1 if 0 else Event2'
> > + after = f'({before})'
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + before = r'Event1 if 1 else Event2'
> > + after = f'({before})'
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + # Ensure the select is evaluate last.
> > + before = r'Event1 + 1 if Event2 < 2 else Event3 + 3'
> > + after = (r'Select(Event(r"Event1") + Constant(1), Event(r"Event2") < '
> > + r'Constant(2), Event(r"Event3") + Constant(3))')
> > + self.assertEqual(ParsePerfJson(before).ToPython(), after)
> > +
> > + before = r'Event1 > 1 if Event2 < 2 else Event3 > 3'
> > + after = (r'Select(Event(r"Event1") > Constant(1), Event(r"Event2") < '
> > + r'Constant(2), Event(r"Event3") > Constant(3))')
> > + self.assertEqual(ParsePerfJson(before).ToPython(), after)
> > +
> > + before = r'min(a + b if c > 1 else c + d, e + f)'
> > + after = r'min((a + b if c > 1 else c + d), e + f)'
> > + self.assertEqual(ParsePerfJson(before).ToPerfJson(), after)
> > +
> > + def test_ToPython(self):
> > + # pylint: disable=eval-used
> > + # Based on an example of a real metric.
> > + before = '(a + b + c + d) / (2 * e)'
> > + py = ParsePerfJson(before).ToPython()
> > + after = eval(py).ToPerfJson()
> > + self.assertEqual(before, after)
> > +
> > + def test_Simplify(self):
> > + before = '1 + 2 + 3'
> > + after = '6'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a + 0'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = '0 + a'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a | 0'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = '0 | a'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a * 0'
> > + after = '0'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = '0 * a'
> > + after = '0'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a * 1'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = '1 * a'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a if 0 else b'
> > + after = 'b'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a if 1 else b'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + before = 'a if b else a'
> > + after = 'a'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > + # Pattern used to add a slots event to metrics that require it.
> > + before = '0 * SLOTS'
> > + after = '0 * SLOTS'
> > + self.assertEqual(ParsePerfJson(before).Simplify().ToPerfJson(), after)
> > +
> > +if __name__ == '__main__':
> > + unittest.main()
> > --
> > 2.39.0.rc0.267.gcb52ba06e7-goog
> >

--

- Arnaldo

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