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//===- unittests/Core/BuildEngineTest.cpp ---------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "llbuild/Evo/EvoEngine.h"
#include "llbuild/Basic/ExecutionQueue.h"
#include "llbuild/Core/BuildDB.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "gtest/gtest.h"
#include <future>
#include <condition_variable>
#include <unordered_map>
#include <vector>
using namespace llbuild;
using namespace llbuild::evo;
namespace {
class SimpleBuildEngineDelegate : public core::BuildEngineDelegate, public basic::ExecutionQueueDelegate {
public:
/// The cycle, if one was detected during building.
std::vector<std::string> cycle;
bool resolveCycle = false;
std::vector<std::string> errors;
bool expectedError = false;
private:
std::unique_ptr<core::Rule> lookupRule(const core::KeyType& key) override {
// We never expect dynamic rule lookup.
fprintf(stderr, "error: unexpected rule lookup for \"%s\"\n",
key.c_str());
abort();
return nullptr;
}
void cycleDetected(const std::vector<core::Rule*>& items) override {
cycle.clear();
std::transform(items.begin(), items.end(), std::back_inserter(cycle),
[](auto rule) { return rule->key.str(); });
}
bool shouldResolveCycle(const std::vector<core::Rule*>& items,
core::Rule* candidateRule,
core::Rule::CycleAction action) override {
return resolveCycle;
}
void error(const Twine& message) override {
errors.push_back(message.str());
if (!expectedError) {
fprintf(stderr, "error: %s\n", message.str().c_str());
abort();
}
}
void processStarted(basic::ProcessContext*, basic::ProcessHandle, llbuild_pid_t) override { }
void processHadError(basic::ProcessContext*, basic::ProcessHandle, const Twine&) override { }
void processHadOutput(basic::ProcessContext*, basic::ProcessHandle, StringRef) override { }
void processFinished(basic::ProcessContext*, basic::ProcessHandle, const basic::ProcessResult&) override { }
void queueJobStarted(basic::JobDescriptor*) override { }
void queueJobFinished(basic::JobDescriptor*) override { }
std::unique_ptr<basic::ExecutionQueue> createExecutionQueue() override {
return createSerialQueue(*this, nullptr);
}
};
static int32_t intFromValue(const core::ValueType& value) {
assert(value.size() == 4);
return ((value[0] << 0) |
(value[1] << 8) |
(value[2] << 16) |
(value[3] << 24));
}
static core::ValueType intToValue(int32_t value) {
std::vector<uint8_t> result(4);
result[0] = (value >> 0) & 0xFF;
result[1] = (value >> 8) & 0xFF;
result[2] = (value >> 16) & 0xFF;
result[3] = (value >> 24) & 0xFF;
return result;
}
TEST(EvoEngineTest, basic) {
// Check a trivial build graph.
std::vector<std::string> builtKeys;
SimpleBuildEngineDelegate delegate;
core::BuildEngine engine(delegate);
class StaticValueRule : public EvoRule {
private:
std::vector<std::string>& builtKeys;
int value;
public:
StaticValueRule(const core::KeyType& key, int value,
std::vector<std::string>& builtKeys)
: EvoRule(key), builtKeys(builtKeys), value(value) { }
core::ValueType run(EvoEngine&) override {
builtKeys.push_back(key.str());
return intToValue(value);
}
bool isResultValid(core::BuildEngine&, const core::ValueType&) override {
return true;
}
};
class CalculatedValueRule : public EvoRule {
private:
std::vector<std::string>& builtKeys;
public:
CalculatedValueRule(const core::KeyType& key,
std::vector<std::string>& builtKeys)
: EvoRule(key), builtKeys(builtKeys) { }
core::ValueType run(EvoEngine& engine) override {
auto a = engine.request("value-A");
auto b = engine.request("value-B");
auto aVal = intFromValue(engine.wait(a));
auto bVal = intFromValue(engine.wait(b));
EXPECT_EQ(2, aVal);
EXPECT_EQ(3, bVal);
builtKeys.push_back(key.str());
return intToValue(aVal * bVal * 5);
}
bool isResultValid(core::BuildEngine&, const core::ValueType&) override {
return true;
}
};
engine.addRule(std::unique_ptr<core::Rule>(new StaticValueRule("value-A", 2, builtKeys)));
engine.addRule(std::unique_ptr<core::Rule>(new StaticValueRule("value-B", 3, builtKeys)));
engine.addRule(std::unique_ptr<core::Rule>(new CalculatedValueRule("result", builtKeys)));
// Build the result.
EXPECT_EQ(2 * 3 * 5, intFromValue(engine.build("result")));
EXPECT_EQ(3U, builtKeys.size());
EXPECT_TRUE("value-A" == builtKeys[0] || "value-A" == builtKeys[1]);
EXPECT_TRUE("value-B" == builtKeys[0] || "value-B" == builtKeys[1]);
EXPECT_EQ("result", builtKeys[2]);
// Check that we can get results for already built nodes, without building
// anything.
builtKeys.clear();
EXPECT_EQ(2, intFromValue(engine.build("value-A")));
EXPECT_TRUE(builtKeys.empty());
builtKeys.clear();
EXPECT_EQ(3, intFromValue(engine.build("value-B")));
EXPECT_TRUE(builtKeys.empty());
}
}
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