mirror of
https://github.com/dart-lang/sdk
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b1c09ecd8f
Currently we have things called XPtr which are not what you get from ptr().
Old world:
handle->raw() returns RawObject* (tagged)
raw_obj->ptr() returns RawObject* (untagged)
After 6fe15f6df9:
handle->raw() returns ObjectPtr
obj_ptr->ptr() returns ObjectLayout*
New world:
handle->ptr() returns ObjectPtr
obj_ptr->untag() returns UntaggedObject*
TEST=ci
Change-Id: I6c7f34014cf20737607caaf84979838300d12df2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149367
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_FRAME_LAYOUT_H_
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#define RUNTIME_VM_FRAME_LAYOUT_H_
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#include "platform/assert.h"
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#include "platform/globals.h"
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// UntaggedFrame structure captures configuration specific properties of the
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// frame layout used by the runtime system and compiler.
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//
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// Runtime system uses runtime_frame_layout defined in stack_frame.h.
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// Compiler uses compiler::target::frame_layout defined in runtime_api.h
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namespace dart {
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// Forward declarations.
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class LocalVariable;
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struct UntaggedFrame {
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// The offset (in words) from FP to the first object.
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int first_object_from_fp;
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// The offset (in words) from FP to the last fixed object.
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int last_fixed_object_from_fp;
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// The offset (in words) from FP to the slot past the last parameter.
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int param_end_from_fp;
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// The offset (in words) from SP on entry (before frame is setup) to
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// the last parameter.
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int last_param_from_entry_sp;
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// The offset (in words) from FP to the first local.
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int first_local_from_fp;
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// The fixed size of the frame.
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int dart_fixed_frame_size;
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// The offset (in words) from FP to the saved pool (if applicable).
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int saved_caller_pp_from_fp;
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// The offset (in words) from FP to the code object (if applicable).
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int code_from_fp;
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// Entry and exit frame layout.
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int exit_link_slot_from_entry_fp;
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// The number of fixed slots below the saved PC.
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int saved_below_pc() const { return -first_local_from_fp; }
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// Returns the FP-relative index where [variable] can be found (assumes
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// [variable] is not captured), in words.
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int FrameSlotForVariable(const LocalVariable* variable) const;
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// Returns the FP-relative index where [variable_index] can be found (assumes
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// [variable_index] comes from a [LocalVariable::index()], which is not
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// captured).
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int FrameSlotForVariableIndex(int index) const;
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// Returns the variable index from a FP-relative index.
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intptr_t VariableIndexForFrameSlot(intptr_t frame_slot) const {
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if (frame_slot <= first_local_from_fp) {
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return frame_slot - first_local_from_fp;
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} else {
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ASSERT(frame_slot > param_end_from_fp);
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return frame_slot - param_end_from_fp;
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}
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}
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// Called to initialize the stack frame layout during startup.
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static void Init();
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};
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} // namespace dart
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#endif // RUNTIME_VM_FRAME_LAYOUT_H_
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