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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_IA32_H_
#define RUNTIME_VM_STACK_FRAME_IA32_H_
#if !defined(RUNTIME_VM_STACK_FRAME_H_)
#error Do not include stack_frame_ia32.h directly; use stack_frame.h instead.
#endif
namespace dart {
/* IA32 Dart Frame Layout
| | <- TOS
Callee frame | ... |
| saved EBP | (EBP of current frame)
| saved PC | (PC of current frame)
+--------------------+
Current frame | ... T| <- ESP of current frame
| first local T|
| code object T| (current frame's code object)
| caller's EBP | <- EBP of current frame
| caller's ret addr | (PC of caller frame)
+--------------------+
Caller frame | last parameter | <- ESP of caller frame
| ... |
T against a slot indicates it needs to be traversed during GC.
*/
static constexpr int kDartFrameFixedSize = 3; // PC marker, EBP, PC.
static constexpr int kSavedPcSlotFromSp = -1;
static constexpr int kFirstObjectSlotFromFp =
-1; // Used by GC to traverse stack.
static constexpr int kLastFixedObjectSlotFromFp = -1;
static constexpr int kFirstLocalSlotFromFp = -2;
static constexpr int kPcMarkerSlotFromFp = -1;
static constexpr int kSavedCallerFpSlotFromFp = 0;
static constexpr int kSavedCallerPcSlotFromFp = 1;
static constexpr int kParamEndSlotFromFp = 1; // One slot past last parameter.
static constexpr int kCallerSpSlotFromFp = 2;
static constexpr int kLastParamSlotFromEntrySp = 1; // Skip return address.
// No pool pointer on IA32 (indicated by aliasing saved fp).
static constexpr int kSavedCallerPpSlotFromFp = kSavedCallerFpSlotFromFp;
// Entry and exit frame layout.
static constexpr int kExitLinkSlotFromEntryFp = -8;
// All arguments are passed on the stack, so none need to be saved. Therefore
// there is no frame for holding the saved arguments.
//
// If NativeCallbackTrampolines::Enabled(), then
// kNativeCallbackTrampolineStackDelta must be added as well.
constexpr intptr_t kCallbackSlotsBeforeSavedArguments = 0;
// For FFI calls passing in TypedData, we save it on the stack before entering
// a Dart frame. This denotes how to get to the backed up typed data.
static constexpr int kFfiCallerTypedDataSlotFromFp = kCallerSpSlotFromFp;
} // namespace dart
#endif // RUNTIME_VM_STACK_FRAME_IA32_H_