8a690a1250
Calling os::malloc()/os::strdup() and new os::strdup_check_oom() instead of ::malloc()/::strdup() for native memory tracking purpose Reviewed-by: coleenp, ctornqvi, kvn
371 lines
11 KiB
C++
371 lines
11 KiB
C++
/*
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* Copyright 2012, 2013 SAP AG. 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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#include "asm/assembler.hpp"
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#include "memory/allocation.hpp"
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#include "memory/allocation.inline.hpp"
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#include "runtime/os.hpp"
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#include "loadlib_aix.hpp"
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#include "porting_aix.hpp"
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#include "utilities/debug.hpp"
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#include <demangle.h>
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#include <sys/debug.h>
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//////////////////////////////////
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// Provide implementation for dladdr based on LoadedLibraries pool and
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// traceback table scan (see getFuncName).
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// Search traceback table in stack,
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// return procedure name from trace back table.
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#define MAX_FUNC_SEARCH_LEN 0x10000
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// Any PC below this value is considered toast.
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#define MINIMUM_VALUE_FOR_PC ((unsigned int*)0x1024)
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#define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2))
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// Align a pointer without having to cast.
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inline char* align_ptr_up(char* ptr, intptr_t alignment) {
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return (char*) align_size_up((intptr_t)ptr, alignment);
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}
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// Trace if verbose to tty.
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// I use these now instead of the Xtrace system because the latter is
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// not available at init time, hence worthless. Until we fix this, all
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// tracing here is done with -XX:+Verbose.
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#define trcVerbose(fmt, ...) { \
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if (Verbose) { \
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fprintf(stderr, fmt, ##__VA_ARGS__); \
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fputc('\n', stderr); fflush(stderr); \
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} \
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}
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#define ERRBYE(s) { trcVerbose(s); return -1; }
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// Unfortunately, the interface of dladdr makes the implementator
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// responsible for maintaining memory for function name/library
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// name. I guess this is because most OS's keep those values as part
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// of the mapped executable image ready to use. On AIX, this doesn't
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// work, so I have to keep the returned strings. For now, I do this in
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// a primitive string map. Should this turn out to be a performance
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// problem, a better hashmap has to be used.
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class fixed_strings {
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struct node : public CHeapObj<mtInternal> {
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char* v;
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node* next;
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};
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node* first;
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public:
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fixed_strings() : first(0) {}
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~fixed_strings() {
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node* n = first;
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while (n) {
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node* p = n;
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n = n->next;
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os::free(p->v);
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delete p;
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}
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}
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char* intern(const char* s) {
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for (node* n = first; n; n = n->next) {
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if (strcmp(n->v, s) == 0) {
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return n->v;
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}
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}
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node* p = new node;
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p->v = os::strdup_check_oom(s);
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p->next = first;
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first = p;
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return p->v;
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}
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};
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static fixed_strings dladdr_fixed_strings;
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// Given a code pointer, returns the function name and the displacement.
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// Function looks for the traceback table at the end of the function.
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extern "C" int getFuncName(
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codeptr_t pc, // [in] program counter
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char* p_name, size_t namelen, // [out] optional: function name ("" if not available)
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int* p_displacement, // [out] optional: displacement (-1 if not available)
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const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further
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// information (NULL if not available)
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char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
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) {
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struct tbtable* tb = 0;
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unsigned int searchcount = 0;
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// initialize output parameters
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if (p_name && namelen > 0) {
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*p_name = '\0';
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}
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if (p_errmsg && errmsglen > 0) {
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*p_errmsg = '\0';
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}
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if (p_displacement) {
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*p_displacement = -1;
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}
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if (p_tb) {
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*p_tb = NULL;
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}
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// weed out obvious bogus states
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if (pc < MINIMUM_VALUE_FOR_PC) {
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ERRBYE("invalid program counter");
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}
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codeptr_t pc2 = pc;
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// make sure the pointer is word aligned.
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pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4);
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// Find start of traceback table.
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// (starts after code, is marked by word-aligned (32bit) zeros)
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while ((*pc2 != NULL) && (searchcount++ < MAX_FUNC_SEARCH_LEN)) {
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pc2++;
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}
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if (*pc2 != 0) {
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ERRBYE("could not find traceback table within 5000 bytes of program counter");
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}
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//
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// Set up addressability to the traceback table
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//
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tb = (struct tbtable*) (pc2 + 1);
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// Is this really a traceback table? No way to be sure but
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// some indicators we can check.
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if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) {
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// Language specifiers, go from 0 (C) to 14 (Objective C).
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// According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm.
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ERRBYE("not a traceback table");
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}
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// Existence of fields in the tbtable extension are contingent upon
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// specific fields in the base table. Check for their existence so
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// that we can address the function name if it exists.
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pc2 = (codeptr_t) tb +
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sizeof(struct tbtable_short)/sizeof(int);
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if (tb->tb.fixedparms != 0 || tb->tb.floatparms != 0)
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pc2++;
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if (tb->tb.has_tboff == TRUE) {
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// I want to know the displacement
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const unsigned int tb_offset = *pc2;
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codeptr_t start_of_procedure =
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(codeptr_t)(((char*)tb) - 4 - tb_offset); // (-4 to omit leading 0000)
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// Weed out the cases where we did find the wrong traceback table.
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if (pc < start_of_procedure) {
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ERRBYE("could not find (the real) traceback table within 5000 bytes of program counter");
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}
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// return the displacement
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if (p_displacement) {
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(*p_displacement) = (int) PTRDIFF_BYTES(pc, start_of_procedure);
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}
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pc2++;
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} else {
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// return -1 for displacement
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if (p_displacement) {
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(*p_displacement) = -1;
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}
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}
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if (tb->tb.int_hndl == TRUE)
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pc2++;
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if (tb->tb.has_ctl == TRUE)
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pc2 += (*pc2) + 1; // don't care
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//
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// return function name if it exists.
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//
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if (p_name && namelen > 0) {
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if (tb->tb.name_present) {
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char buf[256];
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const short l = MIN2<short>(*((short*)pc2), sizeof(buf) - 1);
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memcpy(buf, (char*)pc2 + sizeof(short), l);
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buf[l] = '\0';
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p_name[0] = '\0';
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// If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h).
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char* rest;
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Name* const name = Demangle(buf, rest);
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if (name) {
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const char* const demangled_name = name->Text();
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if (demangled_name) {
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strncpy(p_name, demangled_name, namelen-1);
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p_name[namelen-1] = '\0';
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}
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delete name;
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}
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// Fallback: if demangling did not work, just provide the unmangled name.
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if (p_name[0] == '\0') {
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strncpy(p_name, buf, namelen-1);
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p_name[namelen-1] = '\0';
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}
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} else {
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strncpy(p_name, "<nameless function>", namelen-1);
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p_name[namelen-1] = '\0';
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}
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}
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// Return traceback table, if user wants it.
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if (p_tb) {
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(*p_tb) = tb;
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}
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return 0;
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}
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// Special implementation of dladdr for Aix based on LoadedLibraries
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// Note: dladdr returns non-zero for ok, 0 for error!
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// Note: dladdr is not posix, but a non-standard GNU extension. So this tries to
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// fulfill the contract of dladdr on Linux (see http://linux.die.net/man/3/dladdr)
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// Note: addr may be both an AIX function descriptor or a real code pointer
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// to the entry of a function.
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extern "C"
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int dladdr(void* addr, Dl_info* info) {
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if (!addr) {
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return 0;
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}
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assert(info, "");
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int rc = 0;
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const char* const ZEROSTRING = "";
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// Always return a string, even if a "" one. Linux dladdr manpage
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// does not say anything about returning NULL
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info->dli_fname = ZEROSTRING;
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info->dli_sname = ZEROSTRING;
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info->dli_saddr = NULL;
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address p = (address) addr;
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const LoadedLibraryModule* lib = NULL;
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enum { noclue, code, data } type = noclue;
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trcVerbose("dladdr(%p)...", p);
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// Note: input address may be a function. I accept both a pointer to
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// the entry of a function and a pointer to the function decriptor.
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// (see ppc64 ABI)
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lib = LoadedLibraries::find_for_text_address(p);
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if (lib) {
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type = code;
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}
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if (!lib) {
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// Not a pointer into any text segment. Is it a function descriptor?
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const FunctionDescriptor* const pfd = (const FunctionDescriptor*) p;
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p = pfd->entry();
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if (p) {
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lib = LoadedLibraries::find_for_text_address(p);
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if (lib) {
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type = code;
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}
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}
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}
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if (!lib) {
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// Neither direct code pointer nor function descriptor. A data ptr?
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p = (address)addr;
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lib = LoadedLibraries::find_for_data_address(p);
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if (lib) {
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type = data;
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}
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}
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// If we did find the shared library this address belongs to (either
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// code or data segment) resolve library path and, if possible, the
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// symbol name.
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if (lib) {
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const char* const interned_libpath =
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dladdr_fixed_strings.intern(lib->get_fullpath());
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if (interned_libpath) {
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info->dli_fname = interned_libpath;
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}
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if (type == code) {
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// For code symbols resolve function name and displacement. Use
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// displacement to calc start of function.
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char funcname[256] = "";
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int displacement = 0;
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if (getFuncName((codeptr_t) p, funcname, sizeof(funcname), &displacement,
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NULL, NULL, 0) == 0) {
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if (funcname[0] != '\0') {
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const char* const interned = dladdr_fixed_strings.intern(funcname);
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info->dli_sname = interned;
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trcVerbose("... function name: %s ...", interned);
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}
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// From the displacement calculate the start of the function.
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if (displacement != -1) {
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info->dli_saddr = p - displacement;
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} else {
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info->dli_saddr = p;
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}
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} else {
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// No traceback table found. Just assume the pointer is it.
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info->dli_saddr = p;
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}
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} else if (type == data) {
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// For data symbols.
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info->dli_saddr = p;
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} else {
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ShouldNotReachHere();
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}
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rc = 1; // success: return 1 [sic]
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}
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// sanity checks.
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if (rc) {
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assert(info->dli_fname, "");
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assert(info->dli_sname, "");
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assert(info->dli_saddr, "");
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}
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return rc; // error: return 0 [sic]
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}
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