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test/cctest/compiler/test-structured-ifbuilder-fuzzer.cc

Index: test/cctest/compiler/test-structured-ifbuilder-fuzzer.cc
diff --git a/test/cctest/compiler/test-structured-ifbuilder-fuzzer.cc b/test/cctest/compiler/test-structured-ifbuilder-fuzzer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..156ab8da85ad877e517a6016a213c81b563aa448
--- /dev/null
+++ b/test/cctest/compiler/test-structured-ifbuilder-fuzzer.cc
@@ -0,0 +1,666 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+
+#include "src/v8.h"
+#include "test/cctest/cctest.h"
+
+#include "src/base/utils/random-number-generator.h"
+#include "test/cctest/compiler/codegen-tester.h"
+
+#if V8_TURBOFAN_TARGET
+
+using namespace v8::internal;
+using namespace v8::internal::compiler;
+
+typedef StructuredMachineAssembler::IfBuilder IfBuilder;
+typedef StructuredMachineAssembler::LoopBuilder Loop;
+
+static const int32_t kUninitializedVariableOffset = -1;
+static const int32_t kUninitializedOutput = -1;
+static const int32_t kVerifiedOutput = -2;
+
+static const int32_t kInitalVar = 1013;
+static const int32_t kConjunctionInc = 1069;
+static const int32_t kDisjunctionInc = 1151;
+static const int32_t kThenInc = 1223;
+static const int32_t kElseInc = 1291;
+static const int32_t kIfInc = 1373;
+
+class IfBuilderModel {
+ public:
+  explicit IfBuilderModel(Zone* zone)
+      : zone_(zone),
+        variable_offset_(0),
+        root_(new (zone_) Node(NULL)),
+        current_node_(root_),
+        current_expression_(NULL) {}
+
+  void If() {
+    if (current_node_->else_node != NULL) {
+      current_node_ = current_node_->else_node;
+    } else if (current_node_->then_node != NULL) {
+      current_node_ = current_node_->then_node;
+    }
+    ASSERT(current_expression_ == NULL);
+    current_expression_ = new (zone_) Expression(zone_, NULL);
+    current_node_->condition = current_expression_;
+  }
+  void IfNode() { LastChild()->variable_offset = variable_offset_++; }
+
+  void OpenParen() { current_expression_ = LastChild(); }
+  void CloseParen() { current_expression_ = current_expression_->parent; }
+
+  void And() { NewChild()->conjunction = true; }
+  void Or() { NewChild()->disjunction = true; }
+
+  void Then() {
+    ASSERT(current_expression_ == NULL || current_expression_->parent == NULL);
+    current_expression_ = NULL;
+    ASSERT(current_node_->then_node == NULL);
+    current_node_->then_node = new (zone_) Node(current_node_);
+  }
+  void Else() {
+    ASSERT(current_expression_ == NULL || current_expression_->parent == NULL);
+    current_expression_ = NULL;
+    ASSERT(current_node_->else_node == NULL);
+    current_node_->else_node = new (zone_) Node(current_node_);
+  }
+  void Return() {
+    if (current_node_->else_node != NULL) {
+      current_node_->else_node->returns = true;
+    } else if (current_node_->then_node != NULL) {
+      current_node_->then_node->returns = true;
+    } else {
+      CHECK(false);
+    }
+  }
+  void End() {}
+
+  void Print(std::vector<char>* v) { PrintRecursive(v, root_); }
+
+  struct VerificationState {
+    int32_t* inputs;
+    int32_t* outputs;
+    int32_t var;
+  };
+
+  int32_t Verify(int length, int32_t* inputs, int32_t* outputs) {
+    CHECK_EQ(variable_offset_, length);
+    // Input/Output verification.
+    for (int i = 0; i < length; ++i) {
+      CHECK(inputs[i] == 0 || inputs[i] == 1);
+      CHECK(outputs[i] == kUninitializedOutput || outputs[i] >= 0);
+    }
+    // Do verification.
+    VerificationState state;
+    state.inputs = inputs;
+    state.outputs = outputs;
+    state.var = kInitalVar;
+    VerifyRecursive(root_, &state);
+    // Verify all outputs marked.
+    for (int i = 0; i < length; ++i) {
+      CHECK(outputs[i] == kUninitializedOutput ||
+            outputs[i] == kVerifiedOutput);
+    }
+    return state.var;
+  }
+
+ private:
+  struct Expression;
+  typedef std::vector<Expression*, zone_allocator<Expression*> > Expressions;
+
+  struct Expression : public ZoneObject {
+    Expression(Zone* zone, Expression* p)
+        : variable_offset(kUninitializedVariableOffset),
+          disjunction(false),
+          conjunction(false),
+          parent(p),
+          children(Expressions::allocator_type(zone)) {}
+    int variable_offset;
+    bool disjunction;
+    bool conjunction;
+    Expression* parent;
+    Expressions children;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Expression);
+  };
+
+  struct Node : public ZoneObject {
+    explicit Node(Node* p)
+        : parent(p),
+          condition(NULL),
+          then_node(NULL),
+          else_node(NULL),
+          returns(false) {}
+    Node* parent;
+    Expression* condition;
+    Node* then_node;
+    Node* else_node;
+    bool returns;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Node);
+  };
+
+  Expression* LastChild() {
+    if (current_expression_->children.empty()) {
+      current_expression_->children.push_back(
+          new (zone_) Expression(zone_, current_expression_));
+    }
+    return current_expression_->children.back();
+  }
+
+  Expression* NewChild() {
+    Expression* child = new (zone_) Expression(zone_, current_expression_);
+    current_expression_->children.push_back(child);
+    return child;
+  }
+
+  static void PrintRecursive(std::vector<char>* v, Expression* expression) {
+    CHECK(expression != NULL);
+    if (expression->conjunction) {
+      ASSERT(!expression->disjunction);
+      v->push_back('&');
+    } else if (expression->disjunction) {
+      v->push_back('|');
+    }
+    if (expression->variable_offset != kUninitializedVariableOffset) {
+      v->push_back('v');
+    }
+    Expressions& children = expression->children;
+    if (children.empty()) return;
+    v->push_back('(');
+    for (Expressions::iterator i = children.begin(); i != children.end(); ++i) {
+      PrintRecursive(v, *i);
+    }
+    v->push_back(')');
+  }
+
+  static void PrintRecursive(std::vector<char>* v, Node* node) {
+    // Termination condition.
+    if (node->condition == NULL) {
+      CHECK(node->then_node == NULL && node->else_node == NULL);
+      if (node->returns) v->push_back('r');
+      return;
+    }
+    CHECK(!node->returns);
+    v->push_back('i');
+    PrintRecursive(v, node->condition);
+    if (node->then_node != NULL) {
+      v->push_back('t');
+      PrintRecursive(v, node->then_node);
+    }
+    if (node->else_node != NULL) {
+      v->push_back('e');
+      PrintRecursive(v, node->else_node);
+    }
+  }
+
+  static bool VerifyRecursive(Expression* expression,
+                              VerificationState* state) {
+    bool result = false;
+    bool first_iteration = true;
+    Expressions& children = expression->children;
+    CHECK(!children.empty());
+    for (Expressions::iterator i = children.begin(); i != children.end(); ++i) {
+      Expression* child = *i;
+      // Short circuit evaluation,
+      // but mixes of &&s and ||s have weird semantics.
+      if ((child->conjunction && !result) || (child->disjunction && result)) {
+        continue;
+      }
+      if (child->conjunction) state->var += kConjunctionInc;
+      if (child->disjunction) state->var += kDisjunctionInc;
+      bool child_result;
+      if (child->variable_offset != kUninitializedVariableOffset) {
+        // Verify output
+        CHECK_EQ(state->var, state->outputs[child->variable_offset]);
+        state->outputs[child->variable_offset] = kVerifiedOutput;  // Mark seen.
+        child_result = state->inputs[child->variable_offset];
+        CHECK(child->children.empty());
+        state->var += kIfInc;
+      } else {
+        child_result = VerifyRecursive(child, state);
+      }
+      if (child->conjunction) {
+        result &= child_result;
+      } else if (child->disjunction) {
+        result |= child_result;
+      } else {
+        CHECK(first_iteration);
+        result = child_result;
+      }
+      first_iteration = false;
+    }
+    return result;
+  }
+
+  static void VerifyRecursive(Node* node, VerificationState* state) {
+    if (node->condition == NULL) return;
+    bool result = VerifyRecursive(node->condition, state);
+    if (result) {
+      if (node->then_node) {
+        state->var += kThenInc;
+        return VerifyRecursive(node->then_node, state);
+      }
+    } else {
+      if (node->else_node) {
+        state->var += kElseInc;
+        return VerifyRecursive(node->else_node, state);
+      }
+    }
+  }
+
+  Zone* zone_;
+  int variable_offset_;
+  Node* root_;
+  Node* current_node_;
+  Expression* current_expression_;
+  DISALLOW_COPY_AND_ASSIGN(IfBuilderModel);
+};
+
+
+class IfBuilderGenerator : public StructuredMachineAssemblerTester<int32_t> {
+ public:
+  IfBuilderGenerator()
+      : StructuredMachineAssemblerTester(MachineOperatorBuilder::pointer_rep(),
+                                         MachineOperatorBuilder::pointer_rep()),
+        var_(NewVariable(Int32Constant(kInitalVar))),
+        c_(this),
+        m_(this->zone()),
+        one_(Int32Constant(1)),
+        offset_(0) {}
+
+  static void GenerateExpression(v8::base::RandomNumberGenerator* rng,
+                                 std::vector<char>* v, int n_vars) {
+    int depth = 1;
+    v->push_back('(');
+    bool need_if = true;
+    bool populated = false;
+    while (n_vars != 0) {
+      if (need_if) {
+        // can nest a paren or do a variable
+        if (rng->NextBool()) {
+          v->push_back('v');
+          n_vars--;
+          need_if = false;
+          populated = true;
+        } else {
+          v->push_back('(');
+          depth++;
+          populated = false;
+        }
+      } else {
+        // can pop, do && or do ||
+        int options = 3;
+        if (depth == 1 || !populated) {
+          options--;
+        }
+        switch (rng->NextInt(options)) {
+          case 0:
+            v->push_back('&');
+            need_if = true;
+            break;
+          case 1:
+            v->push_back('|');
+            need_if = true;
+            break;
+          case 2:
+            v->push_back(')');
+            depth--;
+            break;
+        }
+      }
+    }
+    CHECK(!need_if);
+    while (depth != 0) {
+      v->push_back(')');
+      depth--;
+    }
+  }
+
+  static void GenerateIfThenElse(v8::base::RandomNumberGenerator* rng,
+                                 std::vector<char>* v, int n_ifs,
+                                 int max_exp_length) {
+    CHECK_GT(n_ifs, 0);
+    CHECK_GT(max_exp_length, 0);
+    bool have_env = true;
+    bool then_done = false;
+    bool else_done = false;
+    bool first_iteration = true;
+    while (n_ifs != 0) {
+      if (have_env) {
+        int options = 3;
+        if (else_done || first_iteration) {  // Don't do else or return
+          options -= 2;
+          first_iteration = false;
+        }
+        switch (rng->NextInt(options)) {
+          case 0:
+            v->push_back('i');
+            n_ifs--;
+            have_env = false;
+            GenerateExpression(rng, v, rng->NextInt(max_exp_length) + 1);
+            break;
+          case 1:
+            v->push_back('r');
+            have_env = false;
+            break;
+          case 2:
+            v->push_back('e');
+            else_done = true;
+            then_done = false;
+            break;
+          default:
+            CHECK(false);
+        }
+      } else {  // Can only do then or else
+        int options = 2;
+        if (then_done) options--;
+        switch (rng->NextInt(options)) {
+          case 0:
+            v->push_back('e');
+            else_done = true;
+            then_done = false;
+            break;
+          case 1:
+            v->push_back('t');
+            then_done = true;
+            else_done = false;
+            break;
+          default:
+            CHECK(false);
+        }
+        have_env = true;
+      }
+    }
+    // Last instruction must have been an if, can complete it in several ways.
+    int options = 2;
+    if (then_done && !else_done) options++;
+    switch (rng->NextInt(3)) {
+      case 0:
+        // Do nothing.
+        break;
+      case 1:
+        v->push_back('t');
+        switch (rng->NextInt(3)) {
+          case 0:
+            v->push_back('r');
+            break;
+          case 1:
+            v->push_back('e');
+            break;
+          case 2:
+            v->push_back('e');
+            v->push_back('r');
+            break;
+          default:
+            CHECK(false);
+        }
+        break;
+      case 2:
+        v->push_back('e');
+        if (rng->NextBool()) v->push_back('r');
+        break;
+      default:
+        CHECK(false);
+    }
+  }
+
+  std::string::const_iterator ParseExpression(std::string::const_iterator it,
+                                              std::string::const_iterator end) {
+    // Prepare for expression.
+    m_.If();
+    c_.If();
+    int depth = 0;
+    for (; it != end; ++it) {
+      switch (*it) {
+        case 'v':
+          m_.IfNode();
+          {
+            Node* offset = Int32Constant(offset_ * 4);
+            Store(kMachineWord32, Parameter(1), offset, var_.Get());
+            var_.Set(Int32Add(var_.Get(), Int32Constant(kIfInc)));
+            c_.If(Load(kMachineWord32, Parameter(0), offset));
+            offset_++;
+          }
+          break;
+        case '&':
+          m_.And();
+          c_.And();
+          var_.Set(Int32Add(var_.Get(), Int32Constant(kConjunctionInc)));
+          break;
+        case '|':
+          m_.Or();
+          c_.Or();
+          var_.Set(Int32Add(var_.Get(), Int32Constant(kDisjunctionInc)));
+          break;
+        case '(':
+          if (depth != 0) {
+            m_.OpenParen();
+            c_.OpenParen();
+          }
+          depth++;
+          break;
+        case ')':
+          depth--;
+          if (depth == 0) return it;
+          m_.CloseParen();
+          c_.CloseParen();
+          break;
+        default:
+          CHECK(false);
+      }
+    }
+    CHECK(false);
+    return it;
+  }
+
+  void ParseIfThenElse(const std::string& str) {
+    int n_vars = 0;
+    for (std::string::const_iterator it = str.begin(); it != str.end(); ++it) {
+      if (*it == 'v') n_vars++;
+    }
+    InitializeConstants(n_vars);
+    for (std::string::const_iterator it = str.begin(); it != str.end(); ++it) {
+      switch (*it) {
+        case 'i': {
+          it++;
+          CHECK(it != str.end());
+          CHECK_EQ('(', *it);
+          it = ParseExpression(it, str.end());
+          CHECK_EQ(')', *it);
+          break;
+        }
+        case 't':
+          m_.Then();
+          c_.Then();
+          var_.Set(Int32Add(var_.Get(), Int32Constant(kThenInc)));
+          break;
+        case 'e':
+          m_.Else();
+          c_.Else();
+          var_.Set(Int32Add(var_.Get(), Int32Constant(kElseInc)));
+          break;
+        case 'r':
+          m_.Return();
+          Return(var_.Get());
+          break;
+        default:
+          CHECK(false);
+      }
+    }
+    m_.End();
+    c_.End();
+    Return(var_.Get());
+    // Compare generated model to parsed version.
+    {
+      std::vector<char> v;
+      m_.Print(&v);
+      std::string m_str(v.begin(), v.end());
+      CHECK(m_str == str);
+    }
+  }
+
+  void ParseExpression(const std::string& str) {
+    CHECK(inputs_.is_empty());
+    std::string wrapped = "i(" + str + ")te";
+    ParseIfThenElse(wrapped);
+  }
+
+  void ParseRandomIfThenElse(v8::base::RandomNumberGenerator* rng, int n_ifs,
+                             int n_vars) {
+    std::vector<char> v;
+    GenerateIfThenElse(rng, &v, n_ifs, n_vars);
+    std::string str(v.begin(), v.end());
+    ParseIfThenElse(str);
+  }
+
+  void RunRandom(v8::base::RandomNumberGenerator* rng) {
+    // TODO(dcarney): permute inputs via model.
+    // TODO(dcarney): compute test_cases from n_ifs and n_vars.
+    int test_cases = 100;
+    for (int test = 0; test < test_cases; test++) {
+      Initialize();
+      for (int i = 0; i < offset_; i++) {
+        inputs_[i] = rng->NextBool();
+      }
+      DoCall();
+    }
+  }
+
+  void Run(const std::string& str, int32_t expected) {
+    Initialize();
+    int offset = 0;
+    for (std::string::const_iterator it = str.begin(); it != str.end(); ++it) {
+      switch (*it) {
+        case 't':
+          inputs_[offset++] = 1;
+          break;
+        case 'f':
+          inputs_[offset++] = 0;
+          break;
+        default:
+          CHECK(false);
+      }
+    }
+    CHECK_EQ(offset_, offset);
+    // Call.
+    int32_t result = DoCall();
+    CHECK_EQ(result, expected);
+  }
+
+ private:
+  typedef std::vector<int32_t, zone_allocator<int32_t> > IOVector;
+
+  void InitializeConstants(int n_vars) {
+    CHECK(inputs_.is_empty());
+    inputs_.Reset(new int32_t[n_vars]);
+    outputs_.Reset(new int32_t[n_vars]);
+  }
+
+  void Initialize() {
+    for (int i = 0; i < offset_; i++) {
+      inputs_[i] = 0;
+      outputs_[i] = kUninitializedOutput;
+    }
+  }
+
+  int32_t DoCall() {
+    int32_t result = Call(inputs_.get(), outputs_.get());
+    int32_t expected = m_.Verify(offset_, inputs_.get(), outputs_.get());
+    CHECK_EQ(result, expected);
+    return result;
+  }
+
+  const v8::internal::compiler::Variable var_;
+  IfBuilder c_;
+  IfBuilderModel m_;
+  Node* one_;
+  int32_t offset_;
+  SmartArrayPointer<int32_t> inputs_;
+  SmartArrayPointer<int32_t> outputs_;
+};
+
+
+TEST(RunExpressionString) {
+  IfBuilderGenerator m;
+  m.ParseExpression("((v|v)|v)");
+  m.Run("ttt", kInitalVar + 1 * kIfInc + kThenInc);
+  m.Run("ftt", kInitalVar + 2 * kIfInc + kDisjunctionInc + kThenInc);
+  m.Run("fft", kInitalVar + 3 * kIfInc + 2 * kDisjunctionInc + kThenInc);
+  m.Run("fff", kInitalVar + 3 * kIfInc + 2 * kDisjunctionInc + kElseInc);
+}
+
+
+TEST(RunExpressionStrings) {
+  const char* strings[] = {
+      "v",       "(v)",     "((v))",     "v|v",
+      "(v|v)",   "((v|v))", "v&v",       "(v&v)",
+      "((v&v))", "v&(v)",   "v&(v|v)",   "v&(v|v)&v",
+      "v|(v)",   "v|(v&v)", "v|(v&v)|v", "v|(((v)|(v&v)|(v)|v)&(v))|v",
+  };
+  v8::base::RandomNumberGenerator rng;
+  for (size_t i = 0; i < ARRAY_SIZE(strings); i++) {
+    IfBuilderGenerator m;
+    m.ParseExpression(strings[i]);
+    m.RunRandom(&rng);
+  }
+}
+
+
+TEST(RunSimpleIfElseTester) {
+  const char* tests[] = {
+      "i(v)",   "i(v)t",   "i(v)te",
+      "i(v)er", "i(v)ter", "i(v)ti(v)trei(v)ei(v)ei(v)ei(v)ei(v)ei(v)ei(v)e"};
+  v8::base::RandomNumberGenerator rng;
+  for (size_t i = 0; i < ARRAY_SIZE(tests); ++i) {
+    IfBuilderGenerator m;
+    m.ParseIfThenElse(tests[i]);
+    m.RunRandom(&rng);
+  }
+}
+
+
+TEST(RunRandomExpressions) {
+  v8::base::RandomNumberGenerator rng;
+  for (int n_vars = 1; n_vars < 12; n_vars++) {
+    for (int i = 0; i < n_vars * n_vars + 10; i++) {
+      IfBuilderGenerator m;
+      m.ParseRandomIfThenElse(&rng, 1, n_vars);
+      m.RunRandom(&rng);
+    }
+  }
+}
+
+
+TEST(RunRandomIfElse) {
+  v8::base::RandomNumberGenerator rng;
+  for (int n_ifs = 1; n_ifs < 12; n_ifs++) {
+    for (int i = 0; i < n_ifs * n_ifs + 10; i++) {
+      IfBuilderGenerator m;
+      m.ParseRandomIfThenElse(&rng, n_ifs, 1);
+      m.RunRandom(&rng);
+    }
+  }
+}
+
+
+TEST(RunRandomIfElseExpressions) {
+  v8::base::RandomNumberGenerator rng;
+  for (int n_vars = 2; n_vars < 6; n_vars++) {
+    for (int n_ifs = 2; n_ifs < 7; n_ifs++) {
+      for (int i = 0; i < n_ifs * n_vars + 10; i++) {
+        IfBuilderGenerator m;
+        m.ParseRandomIfThenElse(&rng, n_ifs, n_vars);
+        m.RunRandom(&rng);
+      }
+    }
+  }
+}
+
+#endif