Ryan Macnak
9d8dcd1288
Removes the need to relocate their ObjectPool entries when loading a precompiled snapshot. Saves about ~2kB of ObjectPool in hello_world at the cost of ~400B/Thread (64-bit). R=fschneider@google.com Review URL: https://codereview.chromium.org//1315893004 .
46 lines
1.4 KiB
C++
46 lines
1.4 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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#include "vm/globals.h"
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#if defined(TARGET_ARCH_X64)
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#include "vm/runtime_entry.h"
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#include "vm/assembler.h"
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#include "vm/stub_code.h"
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namespace dart {
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#define __ assembler->
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uword RuntimeEntry::GetEntryPoint() const {
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return reinterpret_cast<uword>(function());
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}
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// Generate code to call into the stub which will call the runtime
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// function. Input for the stub is as follows:
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// RSP : points to the arguments and return value array.
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// RBX : address of the runtime function to call.
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// R10 : number of arguments to the call.
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void RuntimeEntry::Call(Assembler* assembler, intptr_t argument_count) const {
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if (is_leaf()) {
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ASSERT(argument_count == this->argument_count());
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COMPILE_ASSERT(CallingConventions::kVolatileCpuRegisters & (1 << RAX));
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__ movq(RAX, Address(THR, Thread::OffsetFromThread(this)));
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__ CallCFunction(RAX);
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} else {
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// Argument count is not checked here, but in the runtime entry for a more
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// informative error message.
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__ movq(RBX, Address(THR, Thread::OffsetFromThread(this)));
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__ movq(R10, Immediate(argument_count));
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__ Call(*StubCode::CallToRuntime_entry());
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}
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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