112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
/*
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* Copyright (c) 2012, 2015 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef OS_AIX_VM_PORTING_AIX_HPP
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#define OS_AIX_VM_PORTING_AIX_HPP
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#include <stddef.h>
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// Header file to contain porting-relevant code which does not have a
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// home anywhere else and which can not go into os_<platform>.h because
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// that header is included inside the os class definition, hence all
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// its content is part of the os class.
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// Aix' own version of dladdr().
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// This function tries to mimick dladdr(3) on Linux
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// (see http://linux.die.net/man/3/dladdr)
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// dladdr(3) is not POSIX but a GNU extension, and is not available on AIX.
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//
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// Differences between AIX dladdr and Linux dladdr:
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//
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// 1) Dl_info.dli_fbase: can never work, is disabled.
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// A loaded image on AIX is divided in multiple segments, at least two
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// (text and data) but potentially also far more. This is because the loader may
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// load each member into an own segment, as for instance happens with the libC.a
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// 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a
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// zero-length string is returned ("").
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// 3) Dl_info.dli_saddr: For code, this will return the entry point of the function,
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// not the function descriptor.
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typedef struct {
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const char *dli_fname; // file path of loaded library
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// void *dli_fbase;
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const char *dli_sname; // symbol name; "" if not known
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void *dli_saddr; // address of *entry* of function; not function descriptor;
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} Dl_info;
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// Note: we export this to use it inside J2se too
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#ifdef __cplusplus
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extern "C"
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#endif
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int dladdr(void *addr, Dl_info *info);
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struct tbtable;
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class AixSymbols {
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public:
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// Given a program counter, tries to locate the traceback table and returns info from
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// it - e.g. function name, displacement of the pc inside the function, and the traceback
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// table itself.
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static bool get_function_name (
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address pc, // [in] program counter
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char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name
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int* p_displacement, // [out] optional: displacement
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const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information
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bool demangle // [in] whether to demangle the name
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);
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// Given a program counter, returns the name of the module (library and module) the pc points to
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static bool get_module_name (
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address pc, // [in] program counter
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char* p_name, size_t namelen // [out] module name
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);
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};
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class AixNativeCallstack {
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public:
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// This function can be used independently from os::init();
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static void print_callstack_for_context(outputStream* st, const ucontext_t* uc,
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bool demangle,
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char* buf, size_t buf_size);
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};
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class AixMisc {
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public:
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struct stackbounds_t {
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address base; // high address (stack grows down)
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size_t size;
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};
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// Invokes pthread_getthrds_np() and returns its values. Note: values are
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// not aligned to stack page sizes.
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// This function can be used independently from os::init();
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static bool query_stack_bounds_for_current_thread(stackbounds_t* out);
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};
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#endif // OS_AIX_VM_PORTING_AIX_HPP
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