llvm-6502/utils/yaml-bench/YAMLBench.cpp

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//===- YAMLBench - Benchmark the YAMLParser implementation ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program executes the YAMLParser on differntly sized YAML texts and
// outputs the run time.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/YAMLParser.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
using namespace llvm;
static cl::opt<bool>
DumpTokens( "tokens"
, cl::desc("Print the tokenization of the file.")
, cl::init(false)
);
static cl::opt<bool>
DumpCanonical( "canonical"
, cl::desc("Print the canonical YAML for this file.")
, cl::init(false)
);
static cl::opt<std::string>
Input(cl::Positional, cl::desc("<input>"));
static cl::opt<bool>
Verify( "verify"
, cl::desc(
"Run a quick verification useful for regression testing")
, cl::init(false)
);
static cl::opt<unsigned>
MemoryLimitMB("memory-limit", cl::desc(
"Do not use more megabytes of memory"),
cl::init(1000));
struct indent {
unsigned distance;
indent(unsigned d) : distance(d) {}
};
static raw_ostream &operator <<(raw_ostream &os, const indent &in) {
for (unsigned i = 0; i < in.distance; ++i)
os << " ";
return os;
}
static void dumpNode( yaml::Node *n
, unsigned Indent = 0
, bool SuppressFirstIndent = false) {
if (!n)
return;
if (!SuppressFirstIndent)
outs() << indent(Indent);
StringRef Anchor = n->getAnchor();
if (!Anchor.empty())
outs() << "&" << Anchor << " ";
if (yaml::ScalarNode *sn = dyn_cast<yaml::ScalarNode>(n)) {
SmallString<32> Storage;
StringRef Val = sn->getValue(Storage);
outs() << "!!str \"" << yaml::escape(Val) << "\"";
} else if (yaml::SequenceNode *sn = dyn_cast<yaml::SequenceNode>(n)) {
outs() << "!!seq [\n";
++Indent;
for (yaml::SequenceNode::iterator i = sn->begin(), e = sn->end();
i != e; ++i) {
dumpNode(i, Indent);
outs() << ",\n";
}
--Indent;
outs() << indent(Indent) << "]";
} else if (yaml::MappingNode *mn = dyn_cast<yaml::MappingNode>(n)) {
outs() << "!!map {\n";
++Indent;
for (yaml::MappingNode::iterator i = mn->begin(), e = mn->end();
i != e; ++i) {
outs() << indent(Indent) << "? ";
dumpNode(i->getKey(), Indent, true);
outs() << "\n";
outs() << indent(Indent) << ": ";
dumpNode(i->getValue(), Indent, true);
outs() << ",\n";
}
--Indent;
outs() << indent(Indent) << "}";
} else if (yaml::AliasNode *an = dyn_cast<yaml::AliasNode>(n)){
outs() << "*" << an->getName();
} else if (dyn_cast<yaml::NullNode>(n)) {
outs() << "!!null null";
}
}
static void dumpStream(yaml::Stream &stream) {
for (yaml::document_iterator di = stream.begin(), de = stream.end(); di != de;
++di) {
outs() << "%YAML 1.2\n"
<< "---\n";
yaml::Node *n = di->getRoot();
if (n)
dumpNode(n);
else
break;
outs() << "\n...\n";
}
}
static void benchmark( llvm::TimerGroup &Group
, llvm::StringRef Name
, llvm::StringRef JSONText) {
llvm::Timer BaseLine((Name + ": Loop").str(), Group);
BaseLine.startTimer();
char C = 0;
for (llvm::StringRef::iterator I = JSONText.begin(),
E = JSONText.end();
I != E; ++I) { C += *I; }
BaseLine.stopTimer();
volatile char DontOptimizeOut = C; (void)DontOptimizeOut;
llvm::Timer Tokenizing((Name + ": Tokenizing").str(), Group);
Tokenizing.startTimer();
{
yaml::scanTokens(JSONText);
}
Tokenizing.stopTimer();
llvm::Timer Parsing((Name + ": Parsing").str(), Group);
Parsing.startTimer();
{
llvm::SourceMgr SM;
llvm::yaml::Stream stream(JSONText, SM);
stream.skip();
}
Parsing.stopTimer();
}
static std::string createJSONText(size_t MemoryMB, unsigned ValueSize) {
std::string JSONText;
llvm::raw_string_ostream Stream(JSONText);
Stream << "[\n";
size_t MemoryBytes = MemoryMB * 1024 * 1024;
while (JSONText.size() < MemoryBytes) {
Stream << " {\n"
<< " \"key1\": \"" << std::string(ValueSize, '*') << "\",\n"
<< " \"key2\": \"" << std::string(ValueSize, '*') << "\",\n"
<< " \"key3\": \"" << std::string(ValueSize, '*') << "\"\n"
<< " }";
Stream.flush();
if (JSONText.size() < MemoryBytes) Stream << ",";
Stream << "\n";
}
Stream << "]\n";
Stream.flush();
return JSONText;
}
int main(int argc, char **argv) {
llvm::cl::ParseCommandLineOptions(argc, argv);
if (Input.getNumOccurrences()) {
OwningPtr<MemoryBuffer> Buf;
if (MemoryBuffer::getFileOrSTDIN(Input, Buf))
return 1;
llvm::SourceMgr sm;
if (DumpTokens) {
yaml::dumpTokens(Buf->getBuffer(), outs());
}
if (DumpCanonical) {
yaml::Stream stream(Buf->getBuffer(), sm);
dumpStream(stream);
}
}
if (Verify) {
llvm::TimerGroup Group("YAML parser benchmark");
benchmark(Group, "Fast", createJSONText(10, 500));
} else if (!DumpCanonical && !DumpTokens) {
llvm::TimerGroup Group("YAML parser benchmark");
benchmark(Group, "Small Values", createJSONText(MemoryLimitMB, 5));
benchmark(Group, "Medium Values", createJSONText(MemoryLimitMB, 500));
benchmark(Group, "Large Values", createJSONText(MemoryLimitMB, 50000));
}
return 0;
}