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Merge pull request #2782 from grahamc/flames

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Track function start and end
This commit is contained in:
Eelco Dolstra 2019-08-15 14:20:42 +02:00 • committed by GitHub
commit 477f82e5a7
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7 changed files with 189 additions and 3 deletions
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8
src/libexpr/eval.cc
View file

@ -9,6 +9,7 @@
#include "json.hh"
#include <algorithm>
#include <chrono>
#include <cstring>
#include <unistd.h>
#include <sys/time.h>
@ -16,7 +17,6 @@
#include <iostream>
#include <fstream>
#include <sys/time.h>
#include <sys/resource.h>
#if HAVE_BOEHMGC
@ -1094,9 +1094,13 @@ void EvalState::callPrimOp(Value & fun, Value & arg, Value & v, const Pos & pos)
}
}
void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & pos)
{
std::optional<FunctionCallTrace> trace;
if (evalSettings.traceFunctionCalls) {
trace.emplace(pos);
}
forceValue(fun, pos);
if (fun.type == tPrimOp || fun.type == tPrimOpApp) {

4
src/libexpr/eval.hh
View file

@ -6,6 +6,7 @@
#include "symbol-table.hh"
#include "hash.hh"
#include "config.hh"
#include "function-trace.hh"
#include <map>
#include <unordered_map>
@ -349,6 +350,9 @@ struct EvalSettings : Config
Setting<Strings> allowedUris{this, {}, "allowed-uris",
"Prefixes of URIs that builtin functions such as fetchurl and fetchGit are allowed to fetch."};
Setting<bool> traceFunctionCalls{this, false, "trace-function-calls",
"Emit log messages for each function entry and exit at the 'vomit' log level (-vvvv)"};
};
extern EvalSettings evalSettings;

24
src/libexpr/function-trace.hh Normal file
View file

@ -0,0 +1,24 @@
#pragma once
#include "eval.hh"
#include <sys/time.h>
namespace nix {
struct FunctionCallTrace
{
const Pos & pos;
FunctionCallTrace(const Pos & pos) : pos(pos) {
auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
vomit("function-trace entered %1% at %2%", pos, ns.count());
}
~FunctionCallTrace() {
auto duration = std::chrono::high_resolution_clock::now().time_since_epoch();
auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(duration);
vomit("function-trace exited %1% at %2%", pos, ns.count());
}
};
}