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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_STACK_FRAME_ARM_H_
#define RUNTIME_VM_STACK_FRAME_ARM_H_
#if !defined(RUNTIME_VM_STACK_FRAME_H_)
#error Do not include stack_frame_arm.h directly; use stack_frame.h instead.
#endif
namespace dart {
/* ARM Dart Frame Layout
| | <- TOS
Callee frame | ... |
| saved PP | (PP of current frame)
| code object |
| saved FP | (FP of current frame)
| saved LR | (PC of current frame)
+--------------------+
Current frame | ... T| <- SP of current frame
| first local T|
| caller's PP T|
| code object T| (current frame's code object)
| caller's FP | <- FP of current frame
| caller's LR | (PC of caller frame)
+--------------------+
Caller frame | last parameter | <- SP of caller frame
| ... |
T against a slot indicates it needs to be traversed during GC.
*/
static const int kDartFrameFixedSize = 4; // PP, FP, LR, PC marker.
static const int kSavedPcSlotFromSp = -1;
static const int kFirstObjectSlotFromFp = -1; // Used by GC to traverse stack.
static const int kLastFixedObjectSlotFromFp = -2;
static const int kFirstLocalSlotFromFp = -3;
static const int kSavedCallerPpSlotFromFp = -2;
static const int kPcMarkerSlotFromFp = -1;
static const int kSavedCallerFpSlotFromFp = 0;
static const int kSavedCallerPcSlotFromFp = 1;
static const int kParamEndSlotFromFp = 1; // One slot past last parameter.
static const int kCallerSpSlotFromFp = 2;
static const int kLastParamSlotFromEntrySp = 0;
// Entry and exit frame layout.
#if defined(TARGET_OS_MACOS) || defined(TARGET_OS_MACOS_IOS)
static const int kExitLinkSlotFromEntryFp = -27;
COMPILE_ASSERT(kAbiPreservedCpuRegCount == 6);
COMPILE_ASSERT(kAbiPreservedFpuRegCount == 4);
#else
static const int kExitLinkSlotFromEntryFp = -28;
COMPILE_ASSERT(kAbiPreservedCpuRegCount == 7);
COMPILE_ASSERT(kAbiPreservedFpuRegCount == 4);
#endif
// For FFI native -> Dart callbacks, the number of stack slots between arguments
// passed on stack and arguments saved in callback prologue.
//
// 2 = return adddress (1) + saved frame pointer (1).
//
// If NativeCallbackTrampolines::Enabled(), then
// kNativeCallbackTrampolineStackDelta must be added as well.
constexpr intptr_t kCallbackSlotsBeforeSavedArguments = 2;
} // namespace dart
#endif // RUNTIME_VM_STACK_FRAME_ARM_H_