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Diffstat (limited to 'js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h')
| -rw-r--r-- | js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h new file mode 100644 index 000000000..8cb557784 --- /dev/null +++ b/js/src/jit/x86-shared/AssemblerBuffer-x86-shared.h @@ -0,0 +1,205 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * vim: set ts=8 sts=4 et sw=4 tw=99: + * + * ***** BEGIN LICENSE BLOCK ***** + * Copyright (C) 2008 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * ***** END LICENSE BLOCK ***** */ + +#ifndef jit_x86_shared_AssemblerBuffer_x86_shared_h +#define jit_x86_shared_AssemblerBuffer_x86_shared_h + +#include <stdarg.h> +#include <string.h> + +#include "ds/PageProtectingVector.h" +#include "jit/ExecutableAllocator.h" +#include "jit/JitSpewer.h" + +// Spew formatting helpers. +#define PRETTYHEX(x) (((x)<0)?"-":""),(((x)<0)?-(x):(x)) + +#define MEM_o "%s0x%x" +#define MEM_os MEM_o "(,%s,%d)" +#define MEM_ob MEM_o "(%s)" +#define MEM_obs MEM_o "(%s,%s,%d)" + +#define MEM_o32 "%s0x%04x" +#define MEM_o32s MEM_o32 "(,%s,%d)" +#define MEM_o32b MEM_o32 "(%s)" +#define MEM_o32bs MEM_o32 "(%s,%s,%d)" +#define MEM_o32r ".Lfrom%d(%%rip)" + +#define ADDR_o(offset) PRETTYHEX(offset) +#define ADDR_os(offset, index, scale) ADDR_o(offset), GPRegName((index)), (1<<(scale)) +#define ADDR_ob(offset, base) ADDR_o(offset), GPRegName((base)) +#define ADDR_obs(offset, base, index, scale) ADDR_ob(offset, base), GPRegName((index)), (1<<(scale)) + +#define ADDR_o32(offset) ADDR_o(offset) +#define ADDR_o32s(offset, index, scale) ADDR_os(offset, index, scale) +#define ADDR_o32b(offset, base) ADDR_ob(offset, base) +#define ADDR_o32bs(offset, base, index, scale) ADDR_obs(offset, base, index, scale) +#define ADDR_o32r(offset) (offset) + +namespace js { + + class Sprinter; + +namespace jit { + + class AssemblerBuffer + { + template<size_t size, typename T> + MOZ_ALWAYS_INLINE void sizedAppendUnchecked(T value) + { + m_buffer.infallibleAppend(reinterpret_cast<unsigned char*>(&value), size); + } + + template<size_t size, typename T> + MOZ_ALWAYS_INLINE void sizedAppend(T value) + { + if (MOZ_UNLIKELY(!m_buffer.append(reinterpret_cast<unsigned char*>(&value), size))) + oomDetected(); + } + + public: + AssemblerBuffer() + : m_oom(false) + { + // Provide memory protection once the buffer starts to get big. + m_buffer.setLowerBoundForProtection(32 * 1024); + } + + void ensureSpace(size_t space) + { + if (MOZ_UNLIKELY(!m_buffer.reserve(m_buffer.length() + space))) + oomDetected(); + } + + bool isAligned(size_t alignment) const + { + return !(m_buffer.length() & (alignment - 1)); + } + + MOZ_ALWAYS_INLINE void putByteUnchecked(int value) { sizedAppendUnchecked<1>(value); } + MOZ_ALWAYS_INLINE void putShortUnchecked(int value) { sizedAppendUnchecked<2>(value); } + MOZ_ALWAYS_INLINE void putIntUnchecked(int value) { sizedAppendUnchecked<4>(value); } + MOZ_ALWAYS_INLINE void putInt64Unchecked(int64_t value) { sizedAppendUnchecked<8>(value); } + + MOZ_ALWAYS_INLINE void putByte(int value) { sizedAppend<1>(value); } + MOZ_ALWAYS_INLINE void putShort(int value) { sizedAppend<2>(value); } + MOZ_ALWAYS_INLINE void putInt(int value) { sizedAppend<4>(value); } + MOZ_ALWAYS_INLINE void putInt64(int64_t value) { sizedAppend<8>(value); } + + MOZ_MUST_USE bool append(const unsigned char* values, size_t size) + { + if (MOZ_UNLIKELY(!m_buffer.append(values, size))) { + oomDetected(); + return false; + } + return true; + } + + unsigned char* data() + { + return m_buffer.begin(); + } + + size_t size() const + { + return m_buffer.length(); + } + + bool oom() const + { + return m_oom; + } + + const unsigned char* buffer() const { + MOZ_ASSERT(!m_oom); + return m_buffer.begin(); + } + + void unprotectDataRegion(size_t firstByteOffset, size_t lastByteOffset) { + m_buffer.unprotectRegion(firstByteOffset, lastByteOffset); + } + void reprotectDataRegion(size_t firstByteOffset, size_t lastByteOffset) { + m_buffer.reprotectRegion(firstByteOffset, lastByteOffset); + } + + protected: + /* + * OOM handling: This class can OOM in the ensureSpace() method trying + * to allocate a new buffer. In response to an OOM, we need to avoid + * crashing and report the error. We also want to make it so that + * users of this class need to check for OOM only at certain points + * and not after every operation. + * + * Our strategy for handling an OOM is to set m_oom, and then clear (but + * not free) m_buffer, preserving the current buffer. This way, the user + * can continue assembling into the buffer, deferring OOM checking + * until the user wants to read code out of the buffer. + * + * See also the |buffer| method. + */ + void oomDetected() { + m_oom = true; + m_buffer.clear(); + } + + PageProtectingVector<unsigned char, 256, SystemAllocPolicy> m_buffer; + bool m_oom; + }; + + class GenericAssembler + { + Sprinter* printer; + + public: + + GenericAssembler() + : printer(NULL) + {} + + void setPrinter(Sprinter* sp) { + printer = sp; + } + + void spew(const char* fmt, ...) MOZ_FORMAT_PRINTF(2, 3) + { + if (MOZ_UNLIKELY(printer || JitSpewEnabled(JitSpew_Codegen))) { + va_list va; + va_start(va, fmt); + spew(fmt, va); + va_end(va); + } + } + + MOZ_COLD void spew(const char* fmt, va_list va); + }; + +} // namespace jit +} // namespace js + +#endif /* jit_x86_shared_AssemblerBuffer_x86_shared_h */ |