[compiler] Extend the functionality of CodeStubAssembler

src/compiler/code-stub-assembler.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 #define V8_COMPILER_CODE_STUB_ASSEMBLER_H_
 
+#include <map>
+
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/allocation.h"
 #include "src/builtins.h"
+#include "src/heap/heap.h"
+#include "src/machine-type.h"
 #include "src/runtime/runtime.h"
+#include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 
 class CallInterfaceDescriptor;
 class Isolate;
 class Zone;
 
 namespace compiler {
 
 class CallDescriptor;
 class Graph;
 class Node;
 class Operator;
 class RawMachineAssembler;
+class RawMachineLabel;
 class Schedule;
 
+#define CODE_STUB_ASSEMBLER_BINARY_OP_LIST(V) \
+  V(IntPtrAdd)                                \
+  V(IntPtrSub)                                \
+  V(Int32Add)                                 \
+  V(Int32Sub)                                 \
+  V(Int32Mul)                                 \
+  V(WordEqual)                                \
+  V(WordNotEqual)                             \
+  V(WordOr)                                   \
+  V(WordAnd)                                  \
+  V(WordXor)                                  \
+  V(WordShl)                                  \
+  V(WordShr)                                  \
+  V(WordSar)                                  \
+  V(WordRor)                                  \
+  V(Word32Equal)                              \
+  V(Word32NotEqual)                           \
+  V(Word32Or)                                 \
+  V(Word32And)                                \
+  V(Word32Xor)                                \
+  V(Word32Shr)                                \
+  V(Word32Sar)                                \
+  V(Word32Ror)                                \
+  V(Word64Equal)                              \
+  V(Word64NotEqual)                           \
+  V(Word64Or)                                 \
+  V(Word64And)                                \
+  V(Word64Xor)                                \
+  V(Word64Shr)                                \
+  V(Word64Sar)                                \
+  V(Word64Ror)
+
 class CodeStubAssembler {
  public:
   CodeStubAssembler(Isolate* isolate, Zone* zone,
                     const CallInterfaceDescriptor& descriptor,
                     Code::Flags flags, const char* name);
   virtual ~CodeStubAssembler();
 
   Handle<Code> GenerateCode();
 
+  class Label;
+  class Variable {
+   public:
+    explicit Variable(CodeStubAssembler* assembler, MachineRepresentation rep);
+    void Bind(Node* value);
+    Node* value() const;
+    MachineRepresentation rep() const;
+    bool IsBound() const;
+
+   private:
+    friend class CodeStubAssembler;
+    class Impl;
+    Impl* impl_;
+  };
+
+  // ===========================================================================
+  // Base Assembler
+  // ===========================================================================
+
   // Constants.
   Node* Int32Constant(int value);
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* HeapConstant(Handle<HeapObject> object);
   Node* BooleanConstant(bool value);
+  Node* ExternalConstant(ExternalReference address);
 
   Node* Parameter(int value);
   void Return(Node* value);
 
-  // Tag and untag Smi values.
-  Node* SmiTag(Node* value);
-  Node* SmiUntag(Node* value);
+  void Bind(Label* label);
+  void Goto(Label* label);
+  void Branch(Node* condition, Label* true_label, Label* false_label);
 
-  // Basic arithmetic operations.
-  Node* IntPtrAdd(Node* a, Node* b);
-  Node* IntPtrSub(Node* a, Node* b);
+  void Switch(Node* index, Label* default_label, int32_t* case_values,
+              Label** case_labels, size_t case_count);
+
+  // Access to the frame pointer
+  Node* LoadFramePointer();
+  Node* LoadParentFramePointer();
+
+// Basic arithmetic operations.
+#define DECLARE_CODE_STUB_ASSEMBER_BINARY_OP(name) Node* name(Node* a, Node* b);
+  CODE_STUB_ASSEMBLER_BINARY_OP_LIST(DECLARE_CODE_STUB_ASSEMBER_BINARY_OP)
+#undef DECLARE_CODE_STUB_ASSEMBER_BINARY_OP
+
   Node* WordShl(Node* value, int shift);
 
-  // Load a field from an object on the heap.
-  Node* LoadObjectField(Node* object, int offset);
-
-  // Call runtime function.
+  // Calls
   Node* CallRuntime(Runtime::FunctionId function_id, Node* context, Node* arg1);
   Node* CallRuntime(Runtime::FunctionId function_id, Node* context, Node* arg1,
                     Node* arg2);
 
   Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
                         Node* arg1);
   Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
                         Node* arg1, Node* arg2);
+  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
+                        Node* arg1, Node* arg2, Node* arg3);
+  Node* TailCallRuntime(Runtime::FunctionId function_id, Node* context,
+                        Node* arg1, Node* arg2, Node* arg3, Node* arg4);
+
+  Node* TailCallStub(CodeStub& stub, Node** args);
+  Node* TailCall(const CallInterfaceDescriptor& descriptor, Node* target,
+                 Node** args);
+
+  // ===========================================================================
+  // Macros
+  // ===========================================================================
+
+  // Tag and untag Smi values.
+  Node* SmiTag(Node* value);
+  Node* SmiUntag(Node* value);
+
+  // Load a value from the root array.
+  Node* LoadRoot(Heap::RootListIndex root_index);
+
+  // Check a value for smi-ness
+  Node* WordIsSmi(Node* a);
+
+  // Load an object pointer from a buffer that isn't in the heap.
+  Node* LoadBufferObject(Node* buffer, int offset);
+  // Load a field from an object on the heap.
+  Node* LoadObjectField(Node* object, int offset);
+
+  // Load an array element from a FixedArray.
+  Node* LoadFixedArrayElementSmiIndex(Node* object, Node* smi_index,
+                                      int additional_offset = 0);
+  Node* LoadFixedArrayElementConstantIndex(Node* object, int index);
 
  private:
   friend class CodeStubAssemblerTester;
 
   Node* CallN(CallDescriptor* descriptor, Node* code_target, Node** args);
   Node* TailCallN(CallDescriptor* descriptor, Node* code_target, Node** args);
 
   Node* SmiShiftBitsConstant();
 
   // Private helpers which delegate to RawMachineAssembler.
   Graph* graph();
   Isolate* isolate();
   Zone* zone();
 
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
   Code::Flags flags_;
   const char* name_;
   bool code_generated_;
+  ZoneVector<Variable::Impl*> variables_;
 
   DISALLOW_COPY_AND_ASSIGN(CodeStubAssembler);
 };
 
+class CodeStubAssembler::Label {
+ public:
+  explicit Label(CodeStubAssembler* assembler);
+  Label(CodeStubAssembler* assembler, int merged_variable_count,
+        CodeStubAssembler::Variable** merged_variables);
+  Label(CodeStubAssembler* assembler,
+        CodeStubAssembler::Variable* merged_variable);
+  ~Label() {}
+
+ private:
+  friend class CodeStubAssembler;
+
+  void Bind();
+  void MergeVariables();
+
+  bool bound_;
+  size_t merge_count_;
+  CodeStubAssembler* assembler_;
+  RawMachineLabel* label_;
+  // Map of variables that need to be merged to their phi nodes (or placeholders
+  // for those phis).
+  std::map<Variable::Impl*, Node*> variable_phis_;
+  // Map of variables to the list of value nodes that have been added from each
+  // merge path in their order of merging.
+  std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
+};
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_STUB_ASSEMBLER_H_