fschneider@google.com
54ea76dc6b
This optimization does not bring any benefit since all functions have at least a call in the slow-path of the stack-overflow check. I'm suggesting to remove support for this optimization since it does not get triggered currently, therefore is also not tested. Plus we have inlining now, which already makes calls to (small enough) leaf functions fast. Review URL: https://codereview.chromium.org//11086044 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13555 260f80e4-7a28-3924-810f-c04153c831b5
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
// Copyright (c) 2011, 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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// The class 'AssemblerMacros' contains assembler instruction groups that
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// are used in Dart.
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#ifndef VM_ASSEMBLER_MACROS_X64_H_
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#define VM_ASSEMBLER_MACROS_X64_H_
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#ifndef VM_ASSEMBLER_MACROS_H_
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#error Do not include assembler_macros_x64.h directly; use assembler_macros.h.
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#endif
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#include "vm/allocation.h"
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#include "vm/constants_x64.h"
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namespace dart {
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// Forward declarations.
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class Assembler;
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class Class;
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class Label;
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class AssemblerMacros : public AllStatic {
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public:
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// Inlined allocation of an instance of class 'cls', code has no runtime
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// calls. Jump to 'failure' if the instance cannot be allocated here.
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// Allocated instance is returned in 'instance_reg'.
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// Only the tags field of the object is initialized.
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static void TryAllocate(Assembler* assembler,
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const Class& cls,
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Label* failure,
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bool near_jump,
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Register instance_reg);
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// Set up a dart frame on entry with a frame pointer and PC information to
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// enable easy access to the RawInstruction object of code corresponding
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// to this frame.
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// The dart frame layout is as follows:
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// ....
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// ret PC
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// saved RBP <=== RBP
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// pc (used to derive the RawInstruction Object of the dart code)
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// locals space <=== RSP
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// .....
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// This code sets this up with the sequence:
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// pushq rbp
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// movq rbp, rsp
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// call L
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// L: <code to adjust saved pc if there is any intrinsification code>
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// .....
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static void EnterDartFrame(Assembler* assembler, intptr_t frame_size);
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// Set up a stub frame so that the stack traversal code can easily identify
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// a stub frame.
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// The stub frame layout is as follows:
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// ....
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// ret PC
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// saved RBP
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// pc (used to derive the RawInstruction Object of the stub)
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// .....
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// This code sets this up with the sequence:
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// pushq rbp
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// movq rbp, rsp
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// pushq immediate(0)
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// .....
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static void EnterStubFrame(Assembler* assembler);
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// Instruction pattern from entrypoint is used in dart frame prologs
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// to set up the frame and save a PC which can be used to figure out the
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// RawInstruction object corresponding to the code running in the frame.
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// entrypoint:
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// pushq rbp (size is 1 byte)
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// movq rbp, rsp (size is 3 bytes)
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// call L (size is 5 bytes)
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// L:
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static const intptr_t kOffsetOfSavedPCfromEntrypoint = 9;
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};
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} // namespace dart.
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#endif // VM_ASSEMBLER_MACROS_X64_H_
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