Mercurial > hg > graal-compiler
view src/os/aix/vm/porting_aix.cpp @ 18442:758ecda76985
FrameMapBuilder: remove freeSpillSlot().
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 17 Nov 2014 16:14:47 +0100 |
parents | 666e6ce3976c |
children |
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/* * Copyright 2012, 2013 SAP AG. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "asm/assembler.hpp" #include "loadlib_aix.hpp" #include "porting_aix.hpp" #include "utilities/debug.hpp" #include <demangle.h> #include <sys/debug.h> ////////////////////////////////// // Provide implementation for dladdr based on LoadedLibraries pool and // traceback table scan (see getFuncName). // Search traceback table in stack, // return procedure name from trace back table. #define MAX_FUNC_SEARCH_LEN 0x10000 // Any PC below this value is considered toast. #define MINIMUM_VALUE_FOR_PC ((unsigned int*)0x1024) #define PTRDIFF_BYTES(p1,p2) (((ptrdiff_t)p1) - ((ptrdiff_t)p2)) // Align a pointer without having to cast. inline char* align_ptr_up(char* ptr, intptr_t alignment) { return (char*) align_size_up((intptr_t)ptr, alignment); } // Trace if verbose to tty. // I use these now instead of the Xtrace system because the latter is // not available at init time, hence worthless. Until we fix this, all // tracing here is done with -XX:+Verbose. #define trcVerbose(fmt, ...) { \ if (Verbose) { \ fprintf(stderr, fmt, ##__VA_ARGS__); \ fputc('\n', stderr); fflush(stderr); \ } \ } #define ERRBYE(s) { trcVerbose(s); return -1; } // Unfortunately, the interface of dladdr makes the implementator // responsible for maintaining memory for function name/library // name. I guess this is because most OS's keep those values as part // of the mapped executable image ready to use. On AIX, this doesn't // work, so I have to keep the returned strings. For now, I do this in // a primitive string map. Should this turn out to be a performance // problem, a better hashmap has to be used. class fixed_strings { struct node { char* v; node* next; }; node* first; public: fixed_strings() : first(0) {} ~fixed_strings() { node* n = first; while (n) { node* p = n; n = n->next; free(p->v); delete p; } } char* intern(const char* s) { for (node* n = first; n; n = n->next) { if (strcmp(n->v, s) == 0) { return n->v; } } node* p = new node; p->v = strdup(s); p->next = first; first = p; return p->v; } }; static fixed_strings dladdr_fixed_strings; // Given a code pointer, returns the function name and the displacement. // Function looks for the traceback table at the end of the function. extern "C" int getFuncName( codeptr_t pc, // [in] program counter char* p_name, size_t namelen, // [out] optional: function name ("" if not available) int* p_displacement, // [out] optional: displacement (-1 if not available) const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further // information (NULL if not available) char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages ) { struct tbtable* tb = 0; unsigned int searchcount = 0; // initialize output parameters if (p_name && namelen > 0) { *p_name = '\0'; } if (p_errmsg && errmsglen > 0) { *p_errmsg = '\0'; } if (p_displacement) { *p_displacement = -1; } if (p_tb) { *p_tb = NULL; } // weed out obvious bogus states if (pc < MINIMUM_VALUE_FOR_PC) { ERRBYE("invalid program counter"); } codeptr_t pc2 = pc; // make sure the pointer is word aligned. pc2 = (codeptr_t) align_ptr_up((char*)pc2, 4); // Find start of traceback table. // (starts after code, is marked by word-aligned (32bit) zeros) while ((*pc2 != NULL) && (searchcount++ < MAX_FUNC_SEARCH_LEN)) { pc2++; } if (*pc2 != 0) { ERRBYE("could not find traceback table within 5000 bytes of program counter"); } // // Set up addressability to the traceback table // tb = (struct tbtable*) (pc2 + 1); // Is this really a traceback table? No way to be sure but // some indicators we can check. if (tb->tb.lang >= 0xf && tb->tb.lang <= 0xfb) { // Language specifiers, go from 0 (C) to 14 (Objective C). // According to spec, 0xf-0xfa reserved, 0xfb-0xff reserved for ibm. ERRBYE("not a traceback table"); } // Existence of fields in the tbtable extension are contingent upon // specific fields in the base table. Check for their existence so // that we can address the function name if it exists. pc2 = (codeptr_t) tb + sizeof(struct tbtable_short)/sizeof(int); if (tb->tb.fixedparms != 0 || tb->tb.floatparms != 0) pc2++; if (tb->tb.has_tboff == TRUE) { // I want to know the displacement const unsigned int tb_offset = *pc2; codeptr_t start_of_procedure = (codeptr_t)(((char*)tb) - 4 - tb_offset); // (-4 to omit leading 0000) // Weed out the cases where we did find the wrong traceback table. if (pc < start_of_procedure) { ERRBYE("could not find (the real) traceback table within 5000 bytes of program counter"); } // return the displacement if (p_displacement) { (*p_displacement) = (int) PTRDIFF_BYTES(pc, start_of_procedure); } pc2++; } else { // return -1 for displacement if (p_displacement) { (*p_displacement) = -1; } } if (tb->tb.int_hndl == TRUE) pc2++; if (tb->tb.has_ctl == TRUE) pc2 += (*pc2) + 1; // don't care // // return function name if it exists. // if (p_name && namelen > 0) { if (tb->tb.name_present) { char buf[256]; const short l = MIN2<short>(*((short*)pc2), sizeof(buf) - 1); memcpy(buf, (char*)pc2 + sizeof(short), l); buf[l] = '\0'; p_name[0] = '\0'; // If it is a C++ name, try and demangle it using the Demangle interface (see demangle.h). char* rest; Name* const name = Demangle(buf, rest); if (name) { const char* const demangled_name = name->Text(); if (demangled_name) { strncpy(p_name, demangled_name, namelen-1); p_name[namelen-1] = '\0'; } delete name; } // Fallback: if demangling did not work, just provide the unmangled name. if (p_name[0] == '\0') { strncpy(p_name, buf, namelen-1); p_name[namelen-1] = '\0'; } } else { strncpy(p_name, "<nameless function>", namelen-1); p_name[namelen-1] = '\0'; } } // Return traceback table, if user wants it. if (p_tb) { (*p_tb) = tb; } return 0; } // Special implementation of dladdr for Aix based on LoadedLibraries // Note: dladdr returns non-zero for ok, 0 for error! // Note: dladdr is not posix, but a non-standard GNU extension. So this tries to // fulfill the contract of dladdr on Linux (see http://linux.die.net/man/3/dladdr) // Note: addr may be both an AIX function descriptor or a real code pointer // to the entry of a function. extern "C" int dladdr(void* addr, Dl_info* info) { if (!addr) { return 0; } assert(info, ""); int rc = 0; const char* const ZEROSTRING = ""; // Always return a string, even if a "" one. Linux dladdr manpage // does not say anything about returning NULL info->dli_fname = ZEROSTRING; info->dli_sname = ZEROSTRING; info->dli_saddr = NULL; address p = (address) addr; const LoadedLibraryModule* lib = NULL; enum { noclue, code, data } type = noclue; trcVerbose("dladdr(%p)...", p); // Note: input address may be a function. I accept both a pointer to // the entry of a function and a pointer to the function decriptor. // (see ppc64 ABI) lib = LoadedLibraries::find_for_text_address(p); if (lib) { type = code; } if (!lib) { // Not a pointer into any text segment. Is it a function descriptor? const FunctionDescriptor* const pfd = (const FunctionDescriptor*) p; p = pfd->entry(); if (p) { lib = LoadedLibraries::find_for_text_address(p); if (lib) { type = code; } } } if (!lib) { // Neither direct code pointer nor function descriptor. A data ptr? p = (address)addr; lib = LoadedLibraries::find_for_data_address(p); if (lib) { type = data; } } // If we did find the shared library this address belongs to (either // code or data segment) resolve library path and, if possible, the // symbol name. if (lib) { const char* const interned_libpath = dladdr_fixed_strings.intern(lib->get_fullpath()); if (interned_libpath) { info->dli_fname = interned_libpath; } if (type == code) { // For code symbols resolve function name and displacement. Use // displacement to calc start of function. char funcname[256] = ""; int displacement = 0; if (getFuncName((codeptr_t) p, funcname, sizeof(funcname), &displacement, NULL, NULL, 0) == 0) { if (funcname[0] != '\0') { const char* const interned = dladdr_fixed_strings.intern(funcname); info->dli_sname = interned; trcVerbose("... function name: %s ...", interned); } // From the displacement calculate the start of the function. if (displacement != -1) { info->dli_saddr = p - displacement; } else { info->dli_saddr = p; } } else { // No traceback table found. Just assume the pointer is it. info->dli_saddr = p; } } else if (type == data) { // For data symbols. info->dli_saddr = p; } else { ShouldNotReachHere(); } rc = 1; // success: return 1 [sic] } // sanity checks. if (rc) { assert(info->dli_fname, ""); assert(info->dli_sname, ""); assert(info->dli_saddr, ""); } return rc; // error: return 0 [sic] }