1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/vm/Xdr.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,133 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "vm/Xdr.h"
1.11 +
1.12 +#include <string.h>
1.13 +
1.14 +#include "jsapi.h"
1.15 +#include "jsscript.h"
1.16 +
1.17 +#include "vm/Debugger.h"
1.18 +
1.19 +using namespace js;
1.20 +
1.21 +void
1.22 +XDRBuffer::freeBuffer()
1.23 +{
1.24 + js_free(base);
1.25 +#ifdef DEBUG
1.26 + memset(this, 0xe2, sizeof *this);
1.27 +#endif
1.28 +}
1.29 +
1.30 +bool
1.31 +XDRBuffer::grow(size_t n)
1.32 +{
1.33 + JS_ASSERT(n > size_t(limit - cursor));
1.34 +
1.35 + const size_t MEM_BLOCK = 8192;
1.36 + size_t offset = cursor - base;
1.37 + size_t newCapacity = JS_ROUNDUP(offset + n, MEM_BLOCK);
1.38 + if (isUint32Overflow(newCapacity)) {
1.39 + JS_ReportErrorNumber(cx(), js_GetErrorMessage, nullptr, JSMSG_TOO_BIG_TO_ENCODE);
1.40 + return false;
1.41 + }
1.42 +
1.43 + void *data = js_realloc(base, newCapacity);
1.44 + if (!data) {
1.45 + js_ReportOutOfMemory(cx());
1.46 + return false;
1.47 + }
1.48 + base = static_cast<uint8_t *>(data);
1.49 + cursor = base + offset;
1.50 + limit = base + newCapacity;
1.51 + return true;
1.52 +}
1.53 +
1.54 +template<XDRMode mode>
1.55 +bool
1.56 +XDRState<mode>::codeChars(jschar *chars, size_t nchars)
1.57 +{
1.58 + size_t nbytes = nchars * sizeof(jschar);
1.59 + if (mode == XDR_ENCODE) {
1.60 + uint8_t *ptr = buf.write(nbytes);
1.61 + if (!ptr)
1.62 + return false;
1.63 + mozilla::NativeEndian::copyAndSwapToLittleEndian(ptr, chars, nchars);
1.64 + } else {
1.65 + const uint8_t *ptr = buf.read(nbytes);
1.66 + mozilla::NativeEndian::copyAndSwapFromLittleEndian(chars, ptr, nchars);
1.67 + }
1.68 + return true;
1.69 +}
1.70 +
1.71 +template<XDRMode mode>
1.72 +static bool
1.73 +VersionCheck(XDRState<mode> *xdr)
1.74 +{
1.75 + uint32_t bytecodeVer;
1.76 + if (mode == XDR_ENCODE)
1.77 + bytecodeVer = XDR_BYTECODE_VERSION;
1.78 +
1.79 + if (!xdr->codeUint32(&bytecodeVer))
1.80 + return false;
1.81 +
1.82 + if (mode == XDR_DECODE && bytecodeVer != XDR_BYTECODE_VERSION) {
1.83 + /* We do not provide binary compatibility with older scripts. */
1.84 + JS_ReportErrorNumber(xdr->cx(), js_GetErrorMessage, nullptr, JSMSG_BAD_SCRIPT_MAGIC);
1.85 + return false;
1.86 + }
1.87 +
1.88 + return true;
1.89 +}
1.90 +
1.91 +template<XDRMode mode>
1.92 +bool
1.93 +XDRState<mode>::codeFunction(MutableHandleObject objp)
1.94 +{
1.95 + if (mode == XDR_DECODE)
1.96 + objp.set(nullptr);
1.97 +
1.98 + if (!VersionCheck(this))
1.99 + return false;
1.100 +
1.101 + return XDRInterpretedFunction(this, NullPtr(), NullPtr(), objp);
1.102 +}
1.103 +
1.104 +template<XDRMode mode>
1.105 +bool
1.106 +XDRState<mode>::codeScript(MutableHandleScript scriptp)
1.107 +{
1.108 + if (mode == XDR_DECODE)
1.109 + scriptp.set(nullptr);
1.110 +
1.111 + if (!VersionCheck(this))
1.112 + return false;
1.113 +
1.114 + if (!XDRScript(this, NullPtr(), NullPtr(), NullPtr(), scriptp))
1.115 + return false;
1.116 +
1.117 + return true;
1.118 +}
1.119 +
1.120 +template<XDRMode mode>
1.121 +bool
1.122 +XDRState<mode>::codeConstValue(MutableHandleValue vp)
1.123 +{
1.124 + return XDRScriptConst(this, vp);
1.125 +}
1.126 +
1.127 +XDRDecoder::XDRDecoder(JSContext *cx, const void *data, uint32_t length,
1.128 + JSPrincipals *originPrincipals)
1.129 + : XDRState<XDR_DECODE>(cx)
1.130 +{
1.131 + buf.setData(data, length);
1.132 + this->originPrincipals_ = originPrincipals;
1.133 +}
1.134 +
1.135 +template class js::XDRState<XDR_ENCODE>;
1.136 +template class js::XDRState<XDR_DECODE>;
