Preparing release.

.github/workflows/alpine.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/fix-trailing-whitespace.yml

@@ -6,7 +6,7 @@ jobs:
   whitespace:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Remove whitespace and check the diff
         run: |
           set -eu

.github/workflows/fuzzers.yml

@@ -37,14 +37,14 @@ jobs:
         chmod +x llvm.sh
         sudo ./llvm.sh $CLANGVERSION
 
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v3
 
-    - uses: actions/cache@v2
+    - uses: actions/cache@v3
       with:
         path: dependencies/.cache
         key: ${{ hashFiles('dependencies/CMakeLists.txt') }}
 
-    - uses: actions/cache@v2
+    - uses: actions/cache@v3
       id: cache-corpus
       with:
         path: out/

.github/workflows/macos-11.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/macos.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/msys2-clang.yml

@@ -24,8 +24,8 @@ jobs:
       CMAKE_GENERATOR: Ninja
 
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/msys2.yml

@@ -26,8 +26,8 @@ jobs:
       CMAKE_GENERATOR: Ninja
 
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu18-checkperf.yml

@@ -15,8 +15,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu18-oldclang.yml

@@ -13,8 +13,8 @@ jobs:
       CC: clang-7
       CXX: clang++-7
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu18-threadsani.yml

@@ -10,8 +10,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu18.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu20-checkperf.yml

@@ -15,8 +15,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu20-gcc8.yml

@@ -0,0 +1,38 @@
+name: Ubuntu 20.04 CI (GCC 8)
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    if: >-
+      ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
+      ! contains(toJSON(github.event.commits.*.message), '[skip github]')
+    runs-on: ubuntu-20.04
+    env:
+      CXX: g++-8
+      CC: gcc-8
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: dependencies/.cache
+          key: ${{ hashFiles('dependencies/CMakeLists.txt') }}
+      - name: Install GCC 8
+        run: sudo apt-get install -y g++-8
+      - name: Use cmake
+        run: |
+          mkdir builddebug &&
+          cd builddebug &&
+          cmake -DCMAKE_BUILD_TYPE=Debug -DSIMDJSON_GOOGLE_BENCHMARKS=OFF -DSIMDJSON_DEVELOPER_MODE=ON -DBUILD_SHARED_LIBS=OFF ..  &&
+          cmake --build .   &&
+          ctest -j --output-on-failure -LE explicitonly   &&
+          cd .. &&
+          mkdir build &&
+          cd build &&
+          cmake  -DSIMDJSON_GOOGLE_BENCHMARKS=ON -DSIMDJSON_DEVELOPER_MODE=ON -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX:PATH=destination ..  &&
+          cmake --build .   &&
+          ctest -j --output-on-failure -LE explicitonly   &&
+          cmake --install . &&
+          echo -e '#include <simdjson.h>\nint main(int argc,char**argv) {simdjson::dom::parser parser;simdjson::dom::element tweets = parser.load(argv[1]); }' > tmp.cpp && c++ -Idestination/include -Ldestination/lib -std=c++17 -Wl,-rpath,destination/lib -o linkandrun tmp.cpp -lsimdjson && ./linkandrun jsonexamples/twitter.json &&
+          cd ../tests/installation_tests/find &&
+          mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=../../../build/destination .. &&  cmake --build .

.github/workflows/ubuntu20-noexcept.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu20-nothread.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu20-sani.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu20-threadsani.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu20.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/ubuntu22-clang13.yml

@@ -0,0 +1,25 @@
+name: Ubuntu 22.04 CI (CLANG 13)
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    if: >-
+      ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
+      ! contains(toJSON(github.event.commits.*.message), '[skip github]')
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: dependencies/.cache
+          key: ${{ hashFiles('dependencies/CMakeLists.txt') }}
+      - name: Install clang++-13
+        run: sudo apt-get install -y clang++-13
+      - name: Use cmake
+        run: |
+          mkdir build &&
+          cd build &&
+          CXX=clang++-13 cmake -DSIMDJSON_DEVELOPER_MODE=ON ..  &&
+          cmake --build .   &&
+          ctest -j --output-on-failure -LE explicitonly

.github/workflows/ubuntu22-gcc12.yml

@@ -0,0 +1,25 @@
+name: Ubuntu 22.04 CI (GCC 12)
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    if: >-
+      ! contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
+      ! contains(toJSON(github.event.commits.*.message), '[skip github]')
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: dependencies/.cache
+          key: ${{ hashFiles('dependencies/CMakeLists.txt') }}
+      - name: Install gcc12
+        run: sudo apt-get install -y g++-12
+      - name: Use cmake
+        run: |
+          mkdir build &&
+          cd build &&
+          CXX=g++-12 cmake -DSIMDJSON_DEVELOPER_MODE=ON ..  &&
+          cmake --build .   &&
+          ctest -j --output-on-failure -LE explicitonly

.github/workflows/ubuntu22.yml

@@ -9,8 +9,8 @@ jobs:
       ! contains(toJSON(github.event.commits.*.message), '[skip github]')
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
         with:
           path: dependencies/.cache
           key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

.github/workflows/vs17-arm-ci.yml

@@ -14,7 +14,7 @@ jobs:
            - {arch: ARM64}
      steps:
        - name: checkout
-         uses: actions/checkout@v2
+         uses: actions/checkout@v3
        - name: Use cmake
          run: |
            cmake -A ${{ matrix.arch }} -DCMAKE_CROSSCOMPILING=1 -DSIMDJSON_DEVELOPER_MODE=ON -D SIMDJSON_GOOGLE_BENCHMARKS=OFF -DSIMDJSON_EXCEPTIONS=OFF -B build  &&

.github/workflows/vs17-ci.yml

@@ -19,7 +19,7 @@ jobs:
           - {gen: Visual Studio 17 2022, arch: x64, shared: OFF}
     steps:
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Configure
       run: |
         cmake -G "${{matrix.gen}}" -A ${{matrix.arch}} -DSIMDJSON_DEVELOPER_MODE=ON -DSIMDJSON_COMPETITION=OFF -DBUILD_SHARED_LIBS=${{matrix.shared}} -B build

.github/workflows/vs17-clang-ci.yml

@@ -16,7 +16,7 @@ jobs:
           - {gen: Visual Studio 17 2022, arch: x64}
     steps:
     - name: checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Configure
       run: |
         cmake -G "${{matrix.gen}}" -A ${{matrix.arch}}  -T ClangCL -DSIMDJSON_DEVELOPER_MODE=ON -DSIMDJSON_COMPETITION=OFF -B build

.github/workflows/vs17-noexcept-ci.yml

@@ -7,8 +7,8 @@ jobs:
     name: windows-vs17
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/cache@v2
+    - uses: actions/checkout@v3
+    - uses: actions/cache@v3
       with:
         path: dependencies/.cache
         key: ${{ hashFiles('dependencies/CMakeLists.txt') }}

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.14)
 project(
     simdjson
     # The version number is modified by tools/release.py
-    VERSION 2.0.2
+    VERSION 2.0.4
     DESCRIPTION "Parsing gigabytes of JSON per second"
     HOMEPAGE_URL "https://simdjson.org/"
     LANGUAGES CXX C

CONTRIBUTING.md

@@ -62,13 +62,13 @@ Pull Requests
 
 Pull requests are always invited. However, we ask that you follow these guidelines:
 
-- It is wiser to discuss your ideas first as part of an issue before you start coding. If you omit this step and code first, be prepare to have your code receive scrutiny and be dropped.
-- Users should provide a rationale for their changes. Does it improve performance? Does it add a feature? Does it improve maintainability? Does fix a bug? This must be explicitly stated as part of the pull request. Do not propose changes based on taste or intuition. We do not delegate programming to tools: that some tool suggested a code change is not reason enough to change the code.
+- It is wise to discuss your ideas first as part of an issue before you start coding. If you omit this step and code first, be prepared to have your code receive scrutiny and be dropped.
+- Users should provide a rationale for their changes. Does it improve performance? Does it add a feature? Does it improve maintainability? Does it fix a bug? This must be explicitly stated as part of the pull request. Do not propose changes based on taste or intuition. We do not delegate programming to tools: that some tool suggested a code change is not reason enough to change the code.
    1. When your code improves performance, please document the gains with a benchmark using hard numbers.
-   2. If your code fixes a bug, please be either fix a failing test, or propose a new test.
+   2. If your code fixes a bug, please either fix a failing test, or propose a new test.
    3. Other types of changes must be clearly motivated. We openly discourage changes with no identifiable benefits.
 - Changes should be focused and minimal. You should change as few lines of code as possible. Please do not reformat or touch files needlessly.
-- New features must be accompanied of new tests, in general.
+- New features must be accompanied by new tests, in general.
 - Your code should pass our continuous-integration tests. It is your responsibility to ensure that your proposal pass the tests. We do not merge pull requests that would break our build.
    - An exception to this would be changes to non-code files, such as documentation and assets, or trivial changes to code, such as comments, where it is encouraged to explicitly ask for skipping a CI run using the `[skip ci]` prefix in your Pull Request title **and** in the first line of the most recent commit in a push. Example for such a commit: `[skip ci] Fixed typo in power_of_ten's docs`
    This benefits the project in such a way that the CI pipeline is not burdened by running jobs on changes that don't change any behavior in the code, which reduces wait times for other Pull Requests that do change behavior and require testing.

Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = simdjson
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "2.0.2"
+PROJECT_NUMBER         = "2.0.4"
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

benchmark/benchfeatures.cpp

@@ -204,10 +204,13 @@ struct feature_benchmarker {
   }
   // Rate of 1-7-structural misses per 8-structural flip
   double struct1_7_miss_rate(BenchmarkStage stage) const {
+#if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+    return 1;
+#else
     if (!has_events()) { return 1; }
     return struct7_miss[stage].best.branch_misses() - struct7[stage].best.branch_misses() / double(struct7_miss.stats->blocks_with_1_structural_flipped);
+#endif
   }
-
   // Extra cost of an 8-15 structural block over a 1-7 structural block
   double struct8_15_cost(BenchmarkStage stage) const {
     return cost_per_block(stage, struct15, struct15.stats->blocks_with_8_structurals, struct7);
@@ -218,8 +221,12 @@ struct feature_benchmarker {
   }
   // Rate of 8-15-structural misses per 8-structural flip
   double struct8_15_miss_rate(BenchmarkStage stage) const {
+#if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+    return 1;
+#else
     if (!has_events()) { return 1; }
     return double(struct15_miss[stage].best.branch_misses() - struct15[stage].best.branch_misses()) / double(struct15_miss.stats->blocks_with_8_structurals_flipped);
+#endif
   }
 
   // Extra cost of a 16+-structural block over an 8-15 structural block (actual varies based on # of structurals!)
@@ -232,10 +239,15 @@ struct feature_benchmarker {
   }
   // Rate of 16-structural misses per 16-structural flip
   double struct16_miss_rate(BenchmarkStage stage) const {
+#if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+    return 1;
+#else
     if (!has_events()) { return 1; }
     return double(struct23_miss[stage].best.branch_misses() - struct23[stage].best.branch_misses()) / double(struct23_miss.stats->blocks_with_16_structurals_flipped);
+#endif
   }
 
+
   // Extra cost of having UTF-8 in a block
   double utf8_cost(BenchmarkStage stage) const {
     return cost_per_block(stage, utf8, utf8.stats->blocks_with_utf8, struct7_full);
@@ -246,10 +258,13 @@ struct feature_benchmarker {
   }
   // Rate of UTF-8 misses per UTF-8 flip
   double utf8_miss_rate(BenchmarkStage stage) const {
+#if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+    return 1;
+#else
     if (!has_events()) { return 1; }
     return double(utf8_miss[stage].best.branch_misses() - utf8[stage].best.branch_misses()) / double(utf8_miss.stats->blocks_with_utf8_flipped);
+#endif
   }
-
   // Extra cost of having escapes in a block
   double escape_cost(BenchmarkStage stage) const {
     return cost_per_block(stage, escape, escape.stats->blocks_with_escapes, struct7_full);
@@ -260,10 +275,15 @@ struct feature_benchmarker {
   }
   // Rate of escape misses per escape flip
   double escape_miss_rate(BenchmarkStage stage) const {
+#if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+    return 1;
+#else
     if (!has_events()) { return 1; }
     return double(escape_miss[stage].best.branch_misses() - escape[stage].best.branch_misses()) / double(escape_miss.stats->blocks_with_escapes_flipped);
+#endif
   }
 
+
   double calc_expected_feature_cost(BenchmarkStage stage, const benchmarker& file) const {
     // Expected base ns/block (empty)
     json_stats& stats = *file.stats;
@@ -300,7 +320,6 @@ struct feature_benchmarker {
   double calc_expected(BenchmarkStage stage, const benchmarker& file) const {
     return calc_expected_feature_cost(stage, file) + calc_expected_miss_cost(stage, file);
   }
-
   void print(const option_struct& options) const {
     printf("\n");
     printf("Features in ns/block (64 bytes):\n");
@@ -359,6 +378,22 @@ struct feature_benchmarker {
   }
 };
 
+#if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+void print_file_effectiveness(BenchmarkStage stage, const char* filename, const benchmarker& results, const feature_benchmarker& features) {
+  double actual = results[stage].best.elapsed_ns() / double(results.stats->blocks);
+  double calc = features.calc_expected(stage, results);
+  double calc_misses = features.calc_expected_misses(stage, results);
+  double calc_miss_cost = features.calc_expected_miss_cost(stage, results);
+  printf("        | %-8s ", benchmark_stage_name(stage));
+  printf("| %-15s ",   filename);
+  printf("|    %8.3g ", features.calc_expected_feature_cost(stage, results));
+  printf("|    %8.3g ", calc_miss_cost);
+  printf("| %8.3g ",  calc);
+  printf("| %8.3g ",  actual);
+  printf("| %+8.3g ", actual - calc);
+  printf("| %13llu ", (long long unsigned)(calc_misses));
+}
+#else
 void print_file_effectiveness(BenchmarkStage stage, const char* filename, const benchmarker& results, const feature_benchmarker& features) {
   double actual = results[stage].best.elapsed_ns() / double(results.stats->blocks);
   double calc = features.calc_expected(stage, results);
@@ -382,6 +417,7 @@ void print_file_effectiveness(BenchmarkStage stage, const char* filename, const
   }
   printf("|\n");
 }
+#endif
 
 int main(int argc, char *argv[]) {
   // Read options

benchmark/benchmarker.h

@@ -423,7 +423,7 @@ struct benchmarker {
         stage.instructions() / static_cast<double>(stats->structurals),
         stage.instructions() / static_cast<double>(stage.cycles())
       );
-
+#if !SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
       // NOTE: removed cycles/miss because it is a somewhat misleading stat
       printf("%s%-13s: %7.0f branch misses (%6.2f%%) - %.0f cache misses (%6.2f%%) - %.2f cache references\n",
         prefix,
@@ -434,6 +434,7 @@ struct benchmarker {
         percent(stage.cache_misses(), all_stages_without_allocation.cache_misses()),
         stage.cache_references()
       );
+#endif
     }
   }
 

benchmark/event_counter.h

@@ -1,6 +1,15 @@
 #ifndef __EVENT_COUNTER_H
 #define __EVENT_COUNTER_H
 
+#ifndef SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+#ifdef __aarch64__
+// on ARM, we use just cycles and instructions
+#define SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS 1
+#else
+// elsewhere, we try to use four counters.
+#define SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS 0
+#endif
+#endif
 #include <cassert>
 #include <cctype>
 #ifndef _MSC_VER
@@ -46,6 +55,12 @@ struct event_count {
   event_count(const event_count& other): elapsed(other.elapsed), event_counts(other.event_counts) { }
 
   // The types of counters (so we can read the getter more easily)
+  #if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+  enum event_counter_types {
+    CPU_CYCLES,
+    INSTRUCTIONS
+  };
+  #else
   enum event_counter_types {
     CPU_CYCLES,
     INSTRUCTIONS,
@@ -53,15 +68,16 @@ struct event_count {
     CACHE_REFERENCES,
     CACHE_MISSES
   };
-
+  #endif
   double elapsed_sec() const { return duration<double>(elapsed).count(); }
   double elapsed_ns() const { return duration<double, std::nano>(elapsed).count(); }
   double cycles() const { return static_cast<double>(event_counts[CPU_CYCLES]); }
   double instructions() const { return static_cast<double>(event_counts[INSTRUCTIONS]); }
+#if !SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
   double branch_misses() const { return static_cast<double>(event_counts[BRANCH_MISSES]); }
   double cache_references() const { return static_cast<double>(event_counts[CACHE_REFERENCES]); }
   double cache_misses() const { return static_cast<double>(event_counts[CACHE_MISSES]); }
-
+#endif
   event_count& operator=(const event_count& other) {
     this->elapsed = other.elapsed;
     this->event_counts = other.event_counts;
@@ -105,9 +121,11 @@ struct event_aggregate {
   double elapsed_ns() const { return total.elapsed_ns() / iterations; }
   double cycles() const { return total.cycles() / iterations; }
   double instructions() const { return total.instructions() / iterations; }
+#if !SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
   double branch_misses() const { return total.branch_misses() / iterations; }
   double cache_references() const { return total.cache_references() / iterations; }
   double cache_misses() const { return total.cache_misses() / iterations; }
+#endif
 };
 
 struct event_collector {
@@ -117,11 +135,16 @@ struct event_collector {
 #if defined(__linux__)
   LinuxEvents<PERF_TYPE_HARDWARE> linux_events;
   event_collector(bool quiet = false) : linux_events(vector<int>{
+  #if SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
+    PERF_COUNT_HW_CPU_CYCLES,
+    PERF_COUNT_HW_INSTRUCTIONS,
+  #else
     PERF_COUNT_HW_CPU_CYCLES,
     PERF_COUNT_HW_INSTRUCTIONS,
     PERF_COUNT_HW_BRANCH_MISSES,
     PERF_COUNT_HW_CACHE_REFERENCES,
     PERF_COUNT_HW_CACHE_MISSES
+  #endif
   }, quiet) {}
   bool has_events() {
     return linux_events.is_working();

benchmark/json_benchmark/run_json_benchmark.h

@@ -58,10 +58,11 @@ template<typename B, typename R> static void run_json_benchmark(benchmark::State
   if (collector.has_events()) {
     state.counters["instructions"] = events.instructions();
     state.counters["cycles"]       = events.cycles();
+#if !SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
     state.counters["branch_miss"]  = events.branch_misses();
     state.counters["cache_miss"]   = events.cache_misses();
     state.counters["cache_ref"]    = events.cache_references();
-
+#endif
     state.counters["instructions_per_byte"]  = events.instructions() / double(bench.bytes_per_iteration());
     state.counters["instructions_per_cycle"] = events.instructions() / events.cycles();
     state.counters["cycles_per_byte"]        = events.cycles()       / double(bench.bytes_per_iteration());
@@ -69,9 +70,11 @@ template<typename B, typename R> static void run_json_benchmark(benchmark::State
 
     state.counters["best_instructions"] = events.best.instructions();
     state.counters["best_cycles"]       = events.best.cycles();
+#if !SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
     state.counters["best_branch_miss"]  = events.best.branch_misses();
     state.counters["best_cache_miss"]   = events.best.cache_misses();
     state.counters["best_cache_ref"]    = events.best.cache_references();
+#endif
 
     state.counters["best_instructions_per_byte"]  = events.best.instructions() / double(bench.bytes_per_iteration());
     state.counters["best_instructions_per_cycle"] = events.best.instructions() / events.best.cycles();
@@ -92,9 +95,11 @@ template<typename B, typename R> static void run_json_benchmark(benchmark::State
   if (collector.has_events()) {
     label << " instructions=" << setw(12) << uint64_t(events.best.instructions())     << setw(0);
     label << " cycles="       << setw(12) << uint64_t(events.best.cycles())           << setw(0);
+#if !SIMDJSON_SIMPLE_PERFORMANCE_COUNTERS
     label << " branch_miss="  << setw(8)  << uint64_t(events.best.branch_misses())    << setw(0);
     label << " cache_miss="   << setw(8)  << uint64_t(events.best.cache_misses())     << setw(0);
     label << " cache_ref="    << setw(10) << uint64_t(events.best.cache_references()) << setw(0);
+#endif
   }
 
   label << " items=" << setw(10) << bench.items_per_iteration() << setw(0);

doc/basics.md

@@ -32,9 +32,12 @@ An overview of what you need to know to use simdjson, with examples.
 Requirements
 ------------------
 
-- A recent compiler (LLVM clang6 or better, GNU GCC 7.4 or better, Xcode 11 or better) on a 64-bit (PPC, ARM or x64 Intel/AMD) POSIX systems such as macOS, freeBSD or Linux. We require that the compiler supports the C++11 standard or better.
+- A recent compiler (LLVM clang 6 or better, GNU GCC 7.4 or better, Xcode 11 or better) on a 64-bit (PPC, ARM or x64 Intel/AMD) POSIX systems such as macOS, freeBSD or Linux. We require that the compiler supports the C++11 standard or better.
 - Visual Studio 2017 or better under 64-bit Windows. Users should target a 64-bit build (x64) instead of a 32-bit build (x86). We support the LLVM clang compiler under Visual Studio (clangcl) as well as as the regular Visual Studio compiler. We also support MinGW 64-bit under Windows.
 
+
+Support for AVX-512 require a processor with AVX512-VBMI2 support (Ice Lake or better) under a 64-bit system and a recent compiler (LLVM clang 6 or better, GCC 8 or better, Visual Studio 2019 or better).
+
 Including simdjson
 ------------------
 

include/simdjson/generic/ondemand/json_iterator-inl.h

@@ -47,6 +47,27 @@ inline void json_iterator::rewind() noexcept {
   _depth = 1;
 }
 
+inline bool json_iterator::balanced() const noexcept {
+  token_iterator ti(token);
+  int32_t count{0};
+  ti.set_position( root_position() );
+  while(ti.peek() <= peek_last()) {
+    switch (*ti.return_current_and_advance())
+    {
+    case '[': case '{':
+      count++;
+      break;
+    case ']': case '}':
+      count--;
+      break;
+    default:
+      break;
+    }
+  }
+  return count == 0;
+}
+
+
 // GCC 7 warns when the first line of this function is inlined away into oblivion due to the caller
 // relating depth and parent_depth, which is a desired effect. The warning does not show up if the
 // skip_child() function is not marked inline).

include/simdjson/generic/ondemand/json_iterator.h

@@ -251,6 +251,13 @@ public:
    * as if it had just been created.
    */
   inline void rewind() noexcept;
+  /**
+   * This checks whether the {,},[,] are balanced so that the document
+   * ends with proper zero depth. This requires scanning the whole document
+   * and it may be expensive. It is expected that it will be rarely called.
+   * It does not attempt to match { with } and [ with ].
+   */
+  inline bool balanced() const noexcept;
 protected:
   simdjson_really_inline json_iterator(const uint8_t *buf, ondemand::parser *parser) noexcept;
   /// The last token before the end

include/simdjson/generic/ondemand/value_iterator-inl.h

@@ -39,9 +39,22 @@ simdjson_warn_unused simdjson_really_inline simdjson_result<bool> value_iterator
   // current document. It only works in the normal mode where we have indexed a single document.
   // Note that adding a check for 'streaming' is not expensive since we only have at most
   // one root element.
-  if (! _json_iter->streaming() && (*_json_iter->peek_last() != '}')) {
-    _json_iter->abandon();
-    return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing } at end");
+  if ( ! _json_iter->streaming() ) {
+    if (*_json_iter->peek_last() != '}') {
+      _json_iter->abandon();
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing } at end");
+    }
+    // If the last character is } *and* the first gibberish character is also '}'
+    // then on-demand could accidentally go over. So we need additional checks.
+    // https://github.com/simdjson/simdjson/issues/1834
+    // Checking that the document is balanced requires a full scan which is potentially
+    // expensive, but it only happens in edge cases where the first padding character is
+    // a closing bracket.
+    if ((*_json_iter->peek(_json_iter->end_position()) == '}') && (!_json_iter->balanced())) {
+      _json_iter->abandon();
+      // The exact error would require more work. It will typically be an unclosed object.
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "the document is unbalanced");
+    }
   }
   return started_object();
 }
@@ -408,9 +421,22 @@ simdjson_warn_unused simdjson_really_inline simdjson_result<bool> value_iterator
   // current document. It only works in the normal mode where we have indexed a single document.
   // Note that adding a check for 'streaming' is not expensive since we only have at most
   // one root element.
-  if ( ! _json_iter->streaming() && (*_json_iter->peek_last() != ']')) {
-    _json_iter->abandon();
-    return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing ] at end");
+  if ( ! _json_iter->streaming() ) {
+    if (*_json_iter->peek_last() != ']') {
+      _json_iter->abandon();
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing ] at end");
+    }
+    // If the last character is ] *and* the first gibberish character is also ']'
+    // then on-demand could accidentally go over. So we need additional checks.
+    // https://github.com/simdjson/simdjson/issues/1834
+    // Checking that the document is balanced requires a full scan which is potentially
+    // expensive, but it only happens in edge cases where the first padding character is
+    // a closing bracket.
+    if ((*_json_iter->peek(_json_iter->end_position()) == ']') && (!_json_iter->balanced())) {
+      _json_iter->abandon();
+      // The exact error would require more work. It will typically be an unclosed array.
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "the document is unbalanced");
+    }
   }
   return started_array();
 }

include/simdjson/icelake/simd.h

@@ -71,7 +71,9 @@ namespace simd {
     simdjson_really_inline base8() : base<simd8<T>>() {}
     simdjson_really_inline base8(const __m512i _value) : base<simd8<T>>(_value) {}
 
-    simdjson_really_inline uint64_t operator==(const simd8<T> other) const { return _mm512_cmpeq_epi8_mask(*this, other); }
+    friend simdjson_really_inline uint64_t operator==(const simd8<T> lhs, const simd8<T> rhs) {
+      return _mm512_cmpeq_epi8_mask(lhs, rhs);
+    }
 
     static const int SIZE = sizeof(base<T>::value);
 

include/simdjson/implementations.h

@@ -21,6 +21,14 @@
 #endif
 #endif
 
+#ifdef _MSC_VER
+#if _MSC_VER >= 1920
+// Visual Studio 2019 and up support VBMI2 under x64 even if the header
+// avx512vbmi2intrin.h is not found.
+#define SIMDJSON_COMPILER_SUPPORTS_VBMI2 1
+#endif
+#endif
+
 // By default, we allow AVX512.
 #ifndef SIMDJSON_AVX512_ALLOWED
 #define SIMDJSON_AVX512_ALLOWED 1

include/simdjson/simdjson_version.h

@@ -4,7 +4,7 @@
 #define SIMDJSON_SIMDJSON_VERSION_H
 
 /** The version of simdjson being used (major.minor.revision) */
-#define SIMDJSON_VERSION 2.0.2
+#define SIMDJSON_VERSION 2.0.4
 
 namespace simdjson {
 enum {
@@ -19,7 +19,7 @@ enum {
   /**
    * The revision (major.minor.REVISION) of simdjson being used.
    */
-  SIMDJSON_VERSION_REVISION = 2
+  SIMDJSON_VERSION_REVISION = 4
 };
 } // namespace simdjson
 

singleheader/simdjson.cpp

@@ -1,4 +1,4 @@
-/* auto-generated on 2022-06-01 16:39:41 -0400. Do not edit! */
+/* auto-generated on 2022-06-15 15:21:33 -0400. Do not edit! */
 /* begin file src/simdjson.cpp */
 #include "simdjson.h"
 

singleheader/simdjson.h

@@ -1,4 +1,4 @@
-/* auto-generated on 2022-06-01 16:39:41 -0400. Do not edit! */
+/* auto-generated on 2022-06-15 15:21:33 -0400. Do not edit! */
 /* begin file include/simdjson.h */
 #ifndef SIMDJSON_H
 #define SIMDJSON_H
@@ -43,7 +43,7 @@
 #define SIMDJSON_SIMDJSON_VERSION_H
 
 /** The version of simdjson being used (major.minor.revision) */
-#define SIMDJSON_VERSION 2.0.2
+#define SIMDJSON_VERSION 2.0.4
 
 namespace simdjson {
 enum {
@@ -58,7 +58,7 @@ enum {
   /**
    * The revision (major.minor.REVISION) of simdjson being used.
    */
-  SIMDJSON_VERSION_REVISION = 2
+  SIMDJSON_VERSION_REVISION = 4
 };
 } // namespace simdjson
 
@@ -9501,6 +9501,14 @@ extern SIMDJSON_DLLIMPORTEXPORT const uint64_t thintable_epi8[256];
 #endif
 #endif
 
+#ifdef _MSC_VER
+#if _MSC_VER >= 1920
+// Visual Studio 2019 and up support VBMI2 under x64 even if the header
+// avx512vbmi2intrin.h is not found.
+#define SIMDJSON_COMPILER_SUPPORTS_VBMI2 1
+#endif
+#endif
+
 // By default, we allow AVX512.
 #ifndef SIMDJSON_AVX512_ALLOWED
 #define SIMDJSON_AVX512_ALLOWED 1
@@ -14238,7 +14246,9 @@ namespace simd {
     simdjson_really_inline base8() : base<simd8<T>>() {}
     simdjson_really_inline base8(const __m512i _value) : base<simd8<T>>(_value) {}
 
-    simdjson_really_inline uint64_t operator==(const simd8<T> other) const { return _mm512_cmpeq_epi8_mask(*this, other); }
+    friend simdjson_really_inline uint64_t operator==(const simd8<T> lhs, const simd8<T> rhs) {
+      return _mm512_cmpeq_epi8_mask(lhs, rhs);
+    }
 
     static const int SIZE = sizeof(base<T>::value);
 
@@ -24211,6 +24221,13 @@ public:
    * as if it had just been created.
    */
   inline void rewind() noexcept;
+  /**
+   * This checks whether the {,},[,] are balanced so that the document
+   * ends with proper zero depth. This requires scanning the whole document
+   * and it may be expensive. It is expected that it will be rarely called.
+   * It does not attempt to match { with } and [ with ].
+   */
+  inline bool balanced() const noexcept;
 protected:
   simdjson_really_inline json_iterator(const uint8_t *buf, ondemand::parser *parser) noexcept;
   /// The last token before the end
@@ -28223,6 +28240,27 @@ inline void json_iterator::rewind() noexcept {
   _depth = 1;
 }
 
+inline bool json_iterator::balanced() const noexcept {
+  token_iterator ti(token);
+  int32_t count{0};
+  ti.set_position( root_position() );
+  while(ti.peek() <= peek_last()) {
+    switch (*ti.return_current_and_advance())
+    {
+    case '[': case '{':
+      count++;
+      break;
+    case ']': case '}':
+      count--;
+      break;
+    default:
+      break;
+    }
+  }
+  return count == 0;
+}
+
+
 // GCC 7 warns when the first line of this function is inlined away into oblivion due to the caller
 // relating depth and parent_depth, which is a desired effect. The warning does not show up if the
 // skip_child() function is not marked inline).
@@ -28569,9 +28607,22 @@ simdjson_warn_unused simdjson_really_inline simdjson_result<bool> value_iterator
   // current document. It only works in the normal mode where we have indexed a single document.
   // Note that adding a check for 'streaming' is not expensive since we only have at most
   // one root element.
-  if (! _json_iter->streaming() && (*_json_iter->peek_last() != '}')) {
-    _json_iter->abandon();
-    return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing } at end");
+  if ( ! _json_iter->streaming() ) {
+    if (*_json_iter->peek_last() != '}') {
+      _json_iter->abandon();
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing } at end");
+    }
+    // If the last character is } *and* the first gibberish character is also '}'
+    // then on-demand could accidentally go over. So we need additional checks.
+    // https://github.com/simdjson/simdjson/issues/1834
+    // Checking that the document is balanced requires a full scan which is potentially
+    // expensive, but it only happens in edge cases where the first padding character is
+    // a closing bracket.
+    if ((*_json_iter->peek(_json_iter->end_position()) == '}') && (!_json_iter->balanced())) {
+      _json_iter->abandon();
+      // The exact error would require more work. It will typically be an unclosed object.
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "the document is unbalanced");
+    }
   }
   return started_object();
 }
@@ -28938,9 +28989,22 @@ simdjson_warn_unused simdjson_really_inline simdjson_result<bool> value_iterator
   // current document. It only works in the normal mode where we have indexed a single document.
   // Note that adding a check for 'streaming' is not expensive since we only have at most
   // one root element.
-  if ( ! _json_iter->streaming() && (*_json_iter->peek_last() != ']')) {
-    _json_iter->abandon();
-    return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing ] at end");
+  if ( ! _json_iter->streaming() ) {
+    if (*_json_iter->peek_last() != ']') {
+      _json_iter->abandon();
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "missing ] at end");
+    }
+    // If the last character is ] *and* the first gibberish character is also ']'
+    // then on-demand could accidentally go over. So we need additional checks.
+    // https://github.com/simdjson/simdjson/issues/1834
+    // Checking that the document is balanced requires a full scan which is potentially
+    // expensive, but it only happens in edge cases where the first padding character is
+    // a closing bracket.
+    if ((*_json_iter->peek(_json_iter->end_position()) == ']') && (!_json_iter->balanced())) {
+      _json_iter->abandon();
+      // The exact error would require more work. It will typically be an unclosed array.
+      return report_error(INCOMPLETE_ARRAY_OR_OBJECT, "the document is unbalanced");
+    }
   }
   return started_array();
 }

tests/ondemand/ondemand_assert_out_of_order_values.cpp

@@ -5,7 +5,14 @@
 #include <sys/types.h>
 #include "simdjson.h"
 
+
+// We get spurious "maybe used uninitialized" warnings under GCC 12.
 using namespace simdjson;
+#if defined(__GNUC__) && !defined(__clang__)
+#if __GNUC__ >= 12
+SIMDJSON_PUSH_DISABLE_ALL_WARNINGS
+#endif
+#endif
 
 // This ensures the compiler can't rearrange them into the proper order (which causes it to work!)
 simdjson_never_inline bool check_point(simdjson_result<ondemand::value> xval, simdjson_result<ondemand::value> yval) {

tests/ondemand/ondemand_error_tests.cpp

@@ -6,6 +6,26 @@ using namespace simdjson;
 namespace error_tests {
   using namespace std;
 
+  bool issue1834() {
+    TEST_START();
+    ondemand::parser parser;
+    auto json = "[[]"_padded;
+    json.data()[json.size()] = ']';
+    auto doc = parser.iterate(json);
+    size_t cnt{};
+    auto error = doc.count_elements().get(cnt);
+    return error != simdjson::SUCCESS;
+  }
+  bool issue1834_2() {
+    TEST_START();
+    ondemand::parser parser;
+    auto json = "{\"a\":{}"_padded;
+    json.data()[json.size()] = '}';
+    auto doc = parser.iterate(json);
+    size_t cnt{};
+    auto error = doc.count_fields().get(cnt);
+    return error != simdjson::SUCCESS;
+  }
   bool empty_document_error() {
     TEST_START();
     ondemand::parser parser;
@@ -272,6 +292,8 @@ namespace error_tests {
 
   bool run() {
     return
+           issue1834() &&
+           issue1834_2() &&
 #if SIMDJSON_EXCEPTIONS
            raw_json_string_except() &&
            raw_json_string_except_with_io() &&