bd82b972fc
deferred code snippets are highly stylized. They always make a call to a stub or the runtime and then return. This change takes advantage of that. Creating a deferred code object now captures a snapshot of the registers in the virtual frame. The registers are automatically saved on entry to the deferred code and restored on exit. The clients of deferred code must ensure that there is no change to the registers in the virtual frame (eg, by allocating which can cause spilling) or to the stack pointer. That is currently the case. As a separate change, I will add either code to verify this constraint or else code to forbid any frame effect. The deferred code itself does not use the virtual frame or register allocator (or even the code generator). It is raw macro assembler code. Review URL: http://codereview.chromium.org/118226 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2112 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_CODEGEN_INL_H_
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#define V8_CODEGEN_INL_H_
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#include "codegen.h"
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#include "register-allocator-inl.h"
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#if V8_TARGET_ARCH_IA32
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#include "ia32/codegen-ia32-inl.h"
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#elif V8_TARGET_ARCH_X64
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#include "x64/codegen-x64-inl.h"
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#elif V8_TARGET_ARCH_ARM
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#include "arm/codegen-arm-inl.h"
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#else
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#error Unsupported target architecture.
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#endif
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namespace v8 {
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namespace internal {
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#define __ ACCESS_MASM(masm_)
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// -----------------------------------------------------------------------------
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// Support for "structured" code comments.
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//
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// By selecting matching brackets in disassembler output,
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// code segments can be identified more easily.
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#ifdef DEBUG
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class Comment BASE_EMBEDDED {
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public:
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Comment(MacroAssembler* masm, const char* msg) : masm_(masm), msg_(msg) {
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__ RecordComment(msg);
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}
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~Comment() {
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if (msg_[0] == '[') __ RecordComment("]");
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}
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private:
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MacroAssembler* masm_;
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const char* msg_;
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};
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#else
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class Comment BASE_EMBEDDED {
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public:
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Comment(MacroAssembler*, const char*) {}
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};
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#endif // DEBUG
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#undef __
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} } // namespace v8::internal
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#endif // V8_CODEGEN_INL_H_
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