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allocator.cpp
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allocator.cpp
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// ArduinoJson - https://arduinojson.org
// Copyright 漏 2014-2023, Benoit BLANCHON
// MIT License
#include <ArduinoJson.h>
#include <stdlib.h> // malloc, free
#include <catch.hpp>
#include <utility>
#include "Allocators.hpp"
using ArduinoJson::detail::sizeofObject;
class ControllableAllocator : public Allocator {
public:
ControllableAllocator() : _enabled(true) {}
virtual ~ControllableAllocator() {}
void* allocate(size_t n) override {
return _enabled ? malloc(n) : 0;
}
void deallocate(void* p) override {
free(p);
}
void* reallocate(void* ptr, size_t n) override {
return realloc(ptr, n);
}
void disable() {
_enabled = false;
}
private:
bool _enabled;
};
TEST_CASE("JsonDocument's allocator") {
SpyingAllocator spyingAllocator;
ControllableAllocator controllableAllocator;
SECTION("Construct/Destruct") {
{ JsonDocument doc(4096, &spyingAllocator); }
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Deallocate(4096));
}
SECTION("Copy construct") {
{
JsonDocument doc1(4096, &spyingAllocator);
doc1.set(std::string("The size of this string is 32!!"));
JsonDocument doc2(doc1);
REQUIRE(doc1.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.capacity() == 4096);
}
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Deallocate(4096)
<< AllocatorLog::Deallocate(4096));
}
SECTION("Move construct") {
{
JsonDocument doc1(4096, &spyingAllocator);
doc1.set(std::string("The size of this string is 32!!"));
JsonDocument doc2(std::move(doc1));
REQUIRE(doc2.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc1.as<std::string>() == "null");
REQUIRE(doc1.capacity() == 0);
REQUIRE(doc2.capacity() == 4096);
}
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Deallocate(4096));
}
SECTION("Copy assign larger") {
{
JsonDocument doc1(4096, &spyingAllocator);
doc1.set(std::string("The size of this string is 32!!"));
JsonDocument doc2(8, &spyingAllocator);
doc2 = doc1;
REQUIRE(doc1.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.capacity() == 4096);
}
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Allocate(8)
<< AllocatorLog::Deallocate(8)
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Deallocate(4096)
<< AllocatorLog::Deallocate(4096));
}
SECTION("Copy assign smaller") {
{
JsonDocument doc1(1024, &spyingAllocator);
doc1.set(std::string("The size of this string is 32!!"));
JsonDocument doc2(4096, &spyingAllocator);
doc2 = doc1;
REQUIRE(doc1.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.capacity() == 1024);
}
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(1024)
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Deallocate(4096)
<< AllocatorLog::Allocate(1024)
<< AllocatorLog::Deallocate(1024)
<< AllocatorLog::Deallocate(1024));
}
SECTION("Copy assign same size") {
{
JsonDocument doc1(1024, &spyingAllocator);
doc1.set(std::string("The size of this string is 32!!"));
JsonDocument doc2(1024, &spyingAllocator);
doc2 = doc1;
REQUIRE(doc1.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc2.capacity() == 1024);
}
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(1024)
<< AllocatorLog::Allocate(1024)
<< AllocatorLog::Deallocate(1024)
<< AllocatorLog::Deallocate(1024));
}
SECTION("Move assign") {
{
JsonDocument doc1(4096, &spyingAllocator);
doc1.set(std::string("The size of this string is 32!!"));
JsonDocument doc2(8, &spyingAllocator);
doc2 = std::move(doc1);
REQUIRE(doc2.as<std::string>() == "The size of this string is 32!!");
REQUIRE(doc1.as<std::string>() == "null");
REQUIRE(doc1.capacity() == 0);
REQUIRE(doc2.capacity() == 4096);
}
REQUIRE(spyingAllocator.log() == AllocatorLog()
<< AllocatorLog::Allocate(4096)
<< AllocatorLog::Allocate(8)
<< AllocatorLog::Deallocate(8)
<< AllocatorLog::Deallocate(4096));
}
SECTION("garbageCollect()") {
JsonDocument doc(4096, &controllableAllocator);
SECTION("when allocation succeeds") {
deserializeJson(doc, "{\"blanket\":1,\"dancing\":2}");
REQUIRE(doc.capacity() == 4096);
REQUIRE(doc.memoryUsage() == sizeofObject(2) + 16);
doc.remove("blanket");
bool result = doc.garbageCollect();
REQUIRE(result == true);
REQUIRE(doc.memoryUsage() == sizeofObject(1) + 8);
REQUIRE(doc.capacity() == 4096);
REQUIRE(doc.as<std::string>() == "{\"dancing\":2}");
}
SECTION("when allocation fails") {
deserializeJson(doc, "{\"blanket\":1,\"dancing\":2}");
REQUIRE(doc.capacity() == 4096);
REQUIRE(doc.memoryUsage() == sizeofObject(2) + 16);
doc.remove("blanket");
controllableAllocator.disable();
bool result = doc.garbageCollect();
REQUIRE(result == false);
REQUIRE(doc.memoryUsage() == sizeofObject(2) + 16);
REQUIRE(doc.capacity() == 4096);
REQUIRE(doc.as<std::string>() == "{\"dancing\":2}");
}
}
}