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17c79a9e23
Besides adapting the components to the use of base/log.h, the patch cleans up a few base headers, i.e., it removes unused includes from root/component.h, specifically base/heap.h and ram_session/ram_session.h. Hence, components that relied on the implicit inclusion of those headers have to manually include those headers now. While adjusting the log messages, I repeatedly stumbled over the problem that printing char * arguments is ambiguous. It is unclear whether to print the argument as pointer or null-terminated string. To overcome this problem, the patch introduces a new type 'Cstring' that allows the caller to express that the argument should be handled as null-terminated string. As a nice side effect, with this type in place, the optional len argument of the 'String' class could be removed. Instead of supplying a pair of (char const *, size_t), the constructor accepts a 'Cstring'. This, in turn, clears the way let the 'String' constructor use the new output mechanism to assemble a string from multiple arguments (and thereby getting rid of snprintf within Genode in the near future). To enforce the explicit resolution of the char * ambiguity, the 'char *' overload of the 'print' function is marked as deleted. Issue #1987
51 lines
1007 B
C++
51 lines
1007 B
C++
/*
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* \brief Utilities for implementing VMMs on Genode/NOVA
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* \author Norman Feske
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* \date 2013-08-20
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*/
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/*
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* Copyright (C) 2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__VMM__PRINTF_H_
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#define _INCLUDE__VMM__PRINTF_H_
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/* Genode includes */
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#include <base/thread.h>
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#include <base/lock.h>
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#include <base/log.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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namespace Vmm {
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using namespace Genode;
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/**
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* Print message while preserving the UTCB content
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*/
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template <typename... ARGS>
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void log(ARGS... args)
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{
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struct Utcb_backup { char buf[Nova::Utcb::size()]; };
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static Lock lock;
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static Utcb_backup utcb_backup;
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Lock::Guard guard(lock);
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utcb_backup = *(Utcb_backup *)Thread::myself()->utcb();
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Genode::log("VMM: ", args...);
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*(Utcb_backup *)Thread::myself()->utcb() = utcb_backup;
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}
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}
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#endif /* _INCLUDE__VMM__PRINTF_H_ */
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