MIPS port initial commit

src/mips/frames-mips.h

+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+
+#ifndef V8_MIPS_FRAMES_MIPS_H_
+#define V8_MIPS_FRAMES_MIPS_H_
+
+
+namespace v8 {
+namespace internal {
+
+// Register lists.
+// Note that the bit values must match those used in actual instruction
+// encoding.
+static const int kNumRegs = 32;
+
+static const RegList kJSCallerSaved =
+  1 << 4 |  // a0
+  1 << 5 |  // a1
+  1 << 6 |  // a2
+  1 << 7;   // a3
+
+static const int kNumJSCallerSaved = 4;
+
+
+// Return the code of the n-th caller-saved register available to JavaScript
+// e.g. JSCallerSavedReg(0) returns r0.code() == 0.
+int JSCallerSavedCode(int n);
+
+
+// Callee-saved registers preserved when switching from C to JavaScript.
+static const RegList kCalleeSaved =
+  // Saved temporaries.
+  1 << 16 | 1 << 17 | 1 << 18 | 1 << 19 |
+  1 << 20 | 1 << 21 | 1 << 22 | 1 << 23 |
+  // gp, sp, fp
+  1 << 28 | 1 << 29 | 1 << 30;
+
+static const int kNumCalleeSaved = 11;
+
+
+typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
+
+
+// ----------------------------------------------------
+
+class StackHandlerConstants : public AllStatic {
+ public:
+  static const int kNextOffset  = 0 * kPointerSize;
+  static const int kStateOffset = 1 * kPointerSize;
+  static const int kFPOffset    = 2 * kPointerSize;
+  static const int kPCOffset    = 3 * kPointerSize;
+
+  static const int kSize = kPCOffset + kPointerSize;
+};
+
+
+class EntryFrameConstants : public AllStatic {
+ public:
+  static const int kCallerFPOffset      = -3 * kPointerSize;
+};
+
+
+class ExitFrameConstants : public AllStatic {
+ public:
+  // Exit frames have a debug marker on the stack.
+  static const int kSPDisplacement = -1 * kPointerSize;
+
+  // The debug marker is just above the frame pointer.
+  static const int kDebugMarkOffset = -1 * kPointerSize;
+  // Must be the same as kDebugMarkOffset. Alias introduced when upgrading.
+  static const int kCodeOffset = -1 * kPointerSize;
+
+  static const int kSavedRegistersOffset = 0 * kPointerSize;
+
+  // The caller fields are below the frame pointer on the stack.
+  static const int kCallerFPOffset = +0 * kPointerSize;
+  // The calling JS function is between FP and PC.
+  static const int kCallerPCOffset = +1 * kPointerSize;
+
+  // FP-relative displacement of the caller's SP.
+  static const int kCallerSPDisplacement = +4 * kPointerSize;
+};
+
+
+class StandardFrameConstants : public AllStatic {
+ public:
+  static const int kExpressionsOffset = -3 * kPointerSize;
+  static const int kMarkerOffset      = -2 * kPointerSize;
+  static const int kContextOffset     = -1 * kPointerSize;
+  static const int kCallerFPOffset    =  0 * kPointerSize;
+  static const int kCallerPCOffset    = +1 * kPointerSize;
+  static const int kCallerSPOffset    = +2 * kPointerSize;
+
+  // Size of the MIPS 4 32-bit argument slots.
+  // This is just an alias with a shorter name. Use it from now on.
+  static const int kRArgsSlotsSize = 4 * kPointerSize;
+  static const int kRegularArgsSlotsSize = kRArgsSlotsSize;
+
+  // C/C++ argument slots size.
+  static const int kCArgsSlotsSize = 4 * kPointerSize;
+  // JS argument slots size.
+  static const int kJSArgsSlotsSize = 0 * kPointerSize;
+};
+
+
+class JavaScriptFrameConstants : public AllStatic {
+ public:
+  // FP-relative.
+  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
+  static const int kSavedRegistersOffset = +2 * kPointerSize;
+  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
+
+  // Caller SP-relative.
+  static const int kParam0Offset   = -2 * kPointerSize;
+  static const int kReceiverOffset = -1 * kPointerSize;
+};
+
+
+class ArgumentsAdaptorFrameConstants : public AllStatic {
+ public:
+  static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset;
+};
+
+
+class InternalFrameConstants : public AllStatic {
+ public:
+  static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
+};
+
+
+inline Object* JavaScriptFrame::function_slot_object() const {
+  const int offset = JavaScriptFrameConstants::kFunctionOffset;
+  return Memory::Object_at(fp() + offset);
+}
+
+} }  // namespace v8::internal
+
+#endif