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// 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 = +3 * 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
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