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Unified Diff: src/compiler/fast-accessor-assembler.h

Issue 1518703002: Re-re-land FastAccessorBuilder. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Add test restrictions, as for test-api-fast-accessor-builder Created 5 years ago
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Index: src/compiler/fast-accessor-assembler.h
diff --git a/src/compiler/fast-accessor-assembler.h b/src/compiler/fast-accessor-assembler.h
new file mode 100644
index 0000000000000000000000000000000000000000..a9df3f0749cce594d4c43a0431b65939fc91ab1f
--- /dev/null
+++ b/src/compiler/fast-accessor-assembler.h
@@ -0,0 +1,106 @@
+// 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_FAST_ACCESSOR_ASSEMBLER_H_
+#define V8_COMPILER_FAST_ACCESSOR_ASSEMBLER_H_
+
+#include <stdint.h>
+#include <vector>
+
+// Clients of this interface shouldn't depend on lots of compiler internals.
+// Do not include anything from src/compiler here!
+#include "include/v8-experimental.h"
+#include "src/base/macros.h"
+#include "src/base/smart-pointers.h"
+#include "src/handles.h"
+
+
+namespace v8 {
+namespace internal {
+
+class Code;
+class Isolate;
+class Zone;
+
+namespace compiler {
+
+class Node;
+class RawMachineAssembler;
+class RawMachineLabel;
+
+
+// This interface "exports" an aggregated subset of RawMachineAssembler, for
+// use by the API to implement Fast Dom Accessors.
+//
+// This interface is made for this single purpose only and does not attempt
+// to implement a general purpose solution. If you need one, please look at
+// RawMachineAssembler instead.
+//
+// The life cycle of a FastAccessorAssembler has two phases:
+// - After creating the instance, you can call an arbitrary sequence of
+// builder functions to build the desired function.
+// - When done, you can Build() the accessor and query for the build results.
+//
+// You cannot call any result getters before Build() was called & successful;
+// and you cannot call any builder functions after Build() was called.
+class FastAccessorAssembler {
+ public:
+ typedef v8::experimental::FastAccessorBuilder::ValueId ValueId;
+ typedef v8::experimental::FastAccessorBuilder::LabelId LabelId;
+
+ explicit FastAccessorAssembler(Isolate* isolate);
+ ~FastAccessorAssembler();
+
+ // Builder / assembler functions:
+ ValueId IntegerConstant(int int_constant);
+ ValueId GetReceiver();
+ ValueId LoadInternalField(ValueId value_id, int field_no);
+ ValueId LoadValue(ValueId value_id, int offset);
+ ValueId LoadObject(ValueId value_id, int offset);
+
+ // Builder / assembler functions for control flow.
+ void ReturnValue(ValueId value_id);
+ void CheckFlagSetOrReturnNull(ValueId value_id, int mask);
+ void CheckNotZeroOrReturnNull(ValueId value_id);
+
+ // TODO(vogelheim): Implement a C++ callback.
+ // void CheckNotNullOrCallback(ValueId value_id, ..c++-callback type...,
+ // ValueId arg1, ValueId arg2, ...);
+
+ LabelId MakeLabel();
+ void SetLabel(LabelId label_id);
+ void CheckNotZeroOrJump(ValueId value_id, LabelId label_id);
+
+ // Assemble the code.
+ MaybeHandle<Code> Build();
+
+ private:
+ ValueId FromRaw(Node* node);
+ LabelId FromRaw(RawMachineLabel* label);
+ Node* FromId(ValueId value) const;
+ RawMachineLabel* FromId(LabelId value) const;
+
+ Zone* zone() { return &zone_; }
+
+ Zone zone_;
+ base::SmartPointer<RawMachineAssembler> assembler_;
+
+ // To prevent exposing the RMA internals to the outside world, we'll map
+ // Node + Label pointers integers wrapped in ValueId and LabelId instances.
+ // These vectors maintain this mapping.
+ std::vector<Node*> nodes_;
+ std::vector<RawMachineLabel*> labels_;
+
+ // Remember the current state for easy error checking. (We prefer to be
+ // strict as this class will be exposed at the API.)
+ enum { kBuilding, kBuilt, kError } state_;
+
+ DISALLOW_COPY_AND_ASSIGN(FastAccessorAssembler);
+};
+
+} // namespace compiler
+} // namespace internal
+} // namespace v8
+
+#endif // V8_COMPILER_FAST_ACCESSOR_ASSEMBLER_H_
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