diff options
Diffstat (limited to 'gcc/ada/tracebak.c')
| -rw-r--r-- | gcc/ada/tracebak.c | 101 |
1 files changed, 99 insertions, 2 deletions
diff --git a/gcc/ada/tracebak.c b/gcc/ada/tracebak.c index 9e74282..d643cfc 100644 --- a/gcc/ada/tracebak.c +++ b/gcc/ada/tracebak.c @@ -6,7 +6,7 @@ * * * C Implementation File * * * - * Copyright (C) 2000-2019, Free Software Foundation, Inc. * + * Copyright (C) 2000-2020, Free Software Foundation, Inc. * * * * GNAT is free software; you can redistribute it and/or modify it under * * terms of the GNU General Public License as published by the Free Soft- * @@ -588,7 +588,101 @@ is_return_from(void *symbol_addr, void *ret_addr) define it to a reasonable value to avoid a compilation error. */ #define _URC_NORMAL_STOP 0 #endif -#include "tb-gcc.c" + +/* This is an implementation of the __gnat_backtrace routine using the + underlying GCC unwinding support associated with the exception handling + infrastructure. This will only work for ZCX based applications. */ + +#include <unwind.h> + +/* The implementation boils down to a call to _Unwind_Backtrace with a + tailored callback and carried-on data structure to keep track of the + input parameters we got as well as of the basic processing state. */ + +/****************** + * trace_callback * + ******************/ + +#if !defined (__USING_SJLJ_EXCEPTIONS__) + +typedef struct { + void ** traceback; + int max_len; + void * exclude_min; + void * exclude_max; + int n_frames_to_skip; + int n_frames_skipped; + int n_entries_filled; +} uw_data_t; + +#if defined (__ia64__) && defined (__hpux__) +#include <uwx.h> +#endif + +static _Unwind_Reason_Code +trace_callback (struct _Unwind_Context * uw_context, uw_data_t * uw_data) +{ + char * pc; + +#if defined (__ia64__) && defined (__hpux__) && defined (USE_LIBUNWIND_EXCEPTIONS) + /* Work around problem with _Unwind_GetIP on ia64 HP-UX. */ + uwx_get_reg ((struct uwx_env *) uw_context, UWX_REG_IP, (uint64_t *) &pc); +#else + pc = (char *) _Unwind_GetIP (uw_context); +#endif + + if (uw_data->n_frames_skipped < uw_data->n_frames_to_skip) + { + uw_data->n_frames_skipped ++; + return _URC_NO_REASON; + } + + if (uw_data->n_entries_filled >= uw_data->max_len) + return _URC_NORMAL_STOP; + + if (pc < (char *)uw_data->exclude_min || pc > (char *)uw_data->exclude_max) + uw_data->traceback [uw_data->n_entries_filled ++] = pc + PC_ADJUST; + + return _URC_NO_REASON; +} + +#endif + +/******************** + * __gnat_backtrace * + ********************/ + +int +__gnat_backtrace (void ** traceback __attribute__((unused)), + int max_len __attribute__((unused)), + void * exclude_min __attribute__((unused)), + void * exclude_max __attribute__((unused)), + int skip_frames __attribute__((unused))) +{ +#if defined (__USING_SJLJ_EXCEPTIONS__) + /* We have no unwind material (tables) at hand with sjlj eh, and no + way to retrieve complete and accurate call chain information from + the context stack we maintain. */ + return 0; +#else + uw_data_t uw_data; + /* State carried over during the whole unwinding process. */ + + uw_data.traceback = traceback; + uw_data.max_len = max_len; + uw_data.exclude_min = exclude_min; + uw_data.exclude_max = exclude_max; + + uw_data.n_frames_to_skip = skip_frames; + + uw_data.n_frames_skipped = 0; + uw_data.n_entries_filled = 0; + + _Unwind_Backtrace ((_Unwind_Trace_Fn)trace_callback, &uw_data); + + return uw_data.n_entries_filled; +#endif +} /*------------------------------------------------------------------* *-- The generic implementation based on frame layout assumptions --* @@ -596,6 +690,9 @@ is_return_from(void *symbol_addr, void *ret_addr) #elif defined (USE_GENERIC_UNWINDER) +/* No warning since the cases where FRAME_LEVEL > 0 are known to work. */ +#pragma GCC diagnostic ignored "-Wframe-address" + #ifndef CURRENT_STACK_FRAME # define CURRENT_STACK_FRAME ({ char __csf; &__csf; }) #endif |