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|
/**
* \file
* generic exception support
*
* Authors:
* Dietmar Maurer (dietmar@ximian.com)
* Mono Team (mono-list@lists.ximian.com)
*
* Copyright 2001-2003 Ximian, Inc.
* Copyright 2003-2008 Novell, Inc.
* Copyright 2011 Xamarin Inc (http://www.xamarin.com).
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
#include <config.h>
#include <glib.h>
#include <string.h>
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#ifdef HAVE_UNWIND_H
#include <unwind.h>
#endif
#include <mono/metadata/appdomain.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
#include <mono/metadata/threads-types.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/exception.h>
#include <mono/metadata/exception-internals.h>
#include <mono/metadata/object-internals.h>
#include <mono/metadata/reflection-internals.h>
#include <mono/metadata/gc-internals.h>
#include <mono/metadata/debug-internals.h>
#include <mono/metadata/mono-debug.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/mono-endian.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/mono-mlist.h>
#include <mono/utils/mono-merp.h>
#include <mono/utils/mono-mmap.h>
#include <mono/utils/mono-logger-internals.h>
#include <mono/utils/mono-error.h>
#include <mono/utils/mono-error-internals.h>
#include <mono/utils/mono-state.h>
#include "mini.h"
#include "trace.h"
#include "debugger-agent.h"
#include "seq-points.h"
#include "llvm-runtime.h"
#include "mini-llvm.h"
#include "aot-runtime.h"
#include "mini-runtime.h"
#include "interp/interp.h"
#ifdef ENABLE_LLVM
#include "mini-llvm-cpp.h"
#endif
#ifdef TARGET_ARM
#include "mini-arm.h"
#endif
#ifndef MONO_ARCH_CONTEXT_DEF
#define MONO_ARCH_CONTEXT_DEF
#endif
#ifndef HOST_WIN32
#include <dlfcn.h>
#endif
/*
* Raw frame information is stored in MonoException.trace_ips as an IntPtr[].
* This structure represents one entry.
* This should consists of pointers only.
*/
typedef struct
{
gpointer ip;
gpointer generic_info;
/* Only for interpreter frames */
MonoJitInfo *ji;
} ExceptionTraceIp;
/* Number of words in trace_ips belonging to one entry */
#define TRACE_IP_ENTRY_SIZE (sizeof (ExceptionTraceIp) / sizeof (gpointer))
static gpointer restore_context_func, call_filter_func;
static gpointer throw_exception_func, rethrow_exception_func, rethrow_preserve_exception_func;
static gpointer throw_corlib_exception_func;
static MonoFtnPtrEHCallback ftnptr_eh_callback;
static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data, gboolean crash_context);
static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
static gboolean mono_current_thread_has_handle_block_guard (void);
static gboolean mono_install_handler_block_guard (MonoThreadUnwindState *ctx);
static void mono_uninstall_current_handler_block_guard (void);
static gboolean mono_exception_walk_trace_internal (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data);
static void mono_summarize_managed_stack (MonoThreadSummary *out);
static void mono_summarize_unmanaged_stack (MonoThreadSummary *out);
static void mono_summarize_exception (MonoException *exc, MonoThreadSummary *out);
static void mono_crash_reporting_register_native_library (const char *module_path, const char *module_name);
static gboolean
first_managed (MonoStackFrameInfo *frame, MonoContext *ctx, gpointer addr)
{
gpointer *data = (gpointer *)addr;
if (!frame->managed)
return FALSE;
if (!ctx) {
// FIXME: Happens with llvm_only
*data = NULL;
return TRUE;
}
*data = frame->frame_addr;
g_assert (*data);
return TRUE;
}
static gpointer
mono_thread_get_managed_sp (void)
{
gpointer addr = NULL;
mono_walk_stack (first_managed, MONO_UNWIND_SIGNAL_SAFE, &addr);
return addr;
}
static inline void
mini_clear_abort_threshold (void)
{
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
jit_tls->abort_exc_stack_threshold = NULL;
}
static inline void
mini_set_abort_threshold (StackFrameInfo *frame)
{
gpointer sp = frame->frame_addr;
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
// Only move it up, to avoid thrown/caught
// exceptions lower in the stack from triggering
// a rethrow
gboolean above_threshold = (gsize) sp >= (gsize) jit_tls->abort_exc_stack_threshold;
if (!jit_tls->abort_exc_stack_threshold || above_threshold) {
jit_tls->abort_exc_stack_threshold = sp;
}
}
// Note: In the case that the frame is above where the thread abort
// was set we bump the threshold so that functions called from the new,
// higher threshold don't trigger the thread abort exception
static inline gboolean
mini_above_abort_threshold (void)
{
gpointer sp = mono_thread_get_managed_sp ();
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
if (!sp)
return TRUE;
gboolean above_threshold = (gsize) sp >= (gsize) jit_tls->abort_exc_stack_threshold;
if (above_threshold)
jit_tls->abort_exc_stack_threshold = sp;
return above_threshold;
}
static int
mono_get_seq_point_for_native_offset (MonoDomain *domain, MonoMethod *method, gint32 native_offset)
{
SeqPoint sp;
if (mono_find_prev_seq_point_for_native_offset (domain, method, native_offset, NULL, &sp))
return sp.il_offset;
return -1;
}
void
mono_exceptions_init (void)
{
MonoRuntimeExceptionHandlingCallbacks cbs;
if (mono_ee_features.use_aot_trampolines) {
restore_context_func = mono_aot_get_trampoline ("restore_context");
call_filter_func = mono_aot_get_trampoline ("call_filter");
throw_exception_func = mono_aot_get_trampoline ("throw_exception");
rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
rethrow_preserve_exception_func = mono_aot_get_trampoline ("rethrow_preserve_exception");
} else {
MonoTrampInfo *info;
restore_context_func = mono_arch_get_restore_context (&info, FALSE);
mono_tramp_info_register (info, NULL);
call_filter_func = mono_arch_get_call_filter (&info, FALSE);
mono_tramp_info_register (info, NULL);
throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
rethrow_preserve_exception_func = mono_arch_get_rethrow_preserve_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
}
mono_arch_exceptions_init ();
cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
cbs.mono_summarize_managed_stack = mono_summarize_managed_stack;
cbs.mono_summarize_unmanaged_stack = mono_summarize_unmanaged_stack;
cbs.mono_summarize_exception = mono_summarize_exception;
cbs.mono_register_native_library = mono_crash_reporting_register_native_library;
if (mono_llvm_only) {
cbs.mono_raise_exception = mono_llvm_raise_exception;
cbs.mono_reraise_exception = mono_llvm_reraise_exception;
} else {
cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
cbs.mono_reraise_exception = (void (*)(MonoException *))mono_get_rethrow_exception ();
}
cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
cbs.mono_exception_walk_trace = mono_exception_walk_trace;
cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
cbs.mono_uninstall_current_handler_block_guard = mono_uninstall_current_handler_block_guard;
cbs.mono_current_thread_has_handle_block_guard = mono_current_thread_has_handle_block_guard;
cbs.mono_clear_abort_threshold = mini_clear_abort_threshold;
cbs.mono_above_abort_threshold = mini_above_abort_threshold;
mono_install_eh_callbacks (&cbs);
mono_install_get_seq_point (mono_get_seq_point_for_native_offset);
}
gpointer
mono_get_throw_exception (void)
{
g_assert (throw_exception_func);
return throw_exception_func;
}
gpointer
mono_get_rethrow_exception (void)
{
g_assert (rethrow_exception_func);
return rethrow_exception_func;
}
gpointer
mono_get_rethrow_preserve_exception (void)
{
g_assert (rethrow_preserve_exception_func);
return rethrow_preserve_exception_func;
}
gpointer
mono_get_call_filter (void)
{
g_assert (call_filter_func);
return call_filter_func;
}
gpointer
mono_get_restore_context (void)
{
g_assert (restore_context_func);
return restore_context_func;
}
gpointer
mono_get_throw_corlib_exception (void)
{
gpointer code = NULL;
MonoTrampInfo *info;
/* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
if (throw_corlib_exception_func)
return throw_corlib_exception_func;
if (mono_ee_features.use_aot_trampolines)
code = mono_aot_get_trampoline ("throw_corlib_exception");
else {
code = mono_arch_get_throw_corlib_exception (&info, FALSE);
mono_tramp_info_register (info, NULL);
}
mono_memory_barrier ();
throw_corlib_exception_func = code;
return throw_corlib_exception_func;
}
/*
* mono_get_throw_exception_addr:
*
* Return an address which stores the result of
* mono_get_throw_exception.
*/
gpointer
mono_get_throw_exception_addr (void)
{
return &throw_exception_func;
}
gpointer
mono_get_rethrow_preserve_exception_addr (void)
{
return &rethrow_preserve_exception_func;
}
static gboolean
is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
{
MonoTryBlockHoleTableJitInfo *table;
int i;
guint32 offset;
guint16 clause;
if (ei->try_start > ip || ip >= ei->try_end)
return FALSE;
if (!ji->has_try_block_holes)
return TRUE;
table = mono_jit_info_get_try_block_hole_table_info (ji);
offset = (guint32)((char*)ip - (char*)ji->code_start);
clause = (guint16)(ei - ji->clauses);
g_assert (clause < ji->num_clauses);
for (i = 0; i < table->num_holes; ++i) {
MonoTryBlockHoleJitInfo *hole = &table->holes [i];
if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
return FALSE;
}
return TRUE;
}
#ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
#if 0
static gboolean show_native_addresses = TRUE;
#else
static gboolean show_native_addresses = FALSE;
#endif
static _Unwind_Reason_Code
build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
{
MonoDomain *domain = mono_domain_get ();
uintptr_t ip = _Unwind_GetIP (frame_ctx);
if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
GList **trace_ips = (GList **)state;
*trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
}
return _URC_NO_REASON;
}
static GSList*
get_unwind_backtrace (void)
{
GSList *ips = NULL;
_Unwind_Backtrace (build_stack_trace, &ips);
return g_slist_reverse (ips);
}
#else
static GSList*
get_unwind_backtrace (void)
{
return NULL;
}
#endif
static gboolean
arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *ji, MonoContext *ctx,
MonoContext *new_ctx, MonoLMF **lmf,
host_mgreg_t **save_locations,
StackFrameInfo *frame)
{
if (!ji && *lmf) {
if (((gsize)(*lmf)->previous_lmf) & 2) {
MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
memset (frame, 0, sizeof (StackFrameInfo));
frame->ji = ji;
*new_ctx = *ctx;
if (ext->kind == MONO_LMFEXT_DEBUGGER_INVOKE) {
/*
* This LMF entry is created by the soft debug code to mark transitions to
* managed code done during invokes.
*/
frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
} else if (ext->kind == MONO_LMFEXT_INTERP_EXIT || ext->kind == MONO_LMFEXT_INTERP_EXIT_WITH_CTX) {
frame->type = FRAME_TYPE_INTERP_TO_MANAGED;
frame->interp_exit_data = ext->interp_exit_data;
if (ext->kind == MONO_LMFEXT_INTERP_EXIT_WITH_CTX) {
frame->type = FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX;
memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
}
} else {
g_assert_not_reached ();
}
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~3);
return TRUE;
}
}
return mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
}
/*
* find_jit_info:
*
* Translate between the mono_arch_unwind_frame function and the old API.
*/
static MonoJitInfo *
find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
{
StackFrameInfo frame;
MonoJitInfo *ji;
gboolean err;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
/* Avoid costly table lookup during stack overflow */
if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
ji = prev_ji;
else
ji = mini_jit_info_table_find (domain, ip, NULL);
if (managed)
*managed = FALSE;
err = arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
if (!err)
return (MonoJitInfo *)-1;
if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
/*
* Remove any unused lmf.
* Mask out the lower bits which might be used to hold additional information.
*/
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(TARGET_SIZEOF_VOID_P -1));
}
/* Convert between the new and the old APIs */
switch (frame.type) {
case FRAME_TYPE_MANAGED:
if (managed)
*managed = TRUE;
return frame.ji;
case FRAME_TYPE_TRAMPOLINE:
return frame.ji;
case FRAME_TYPE_MANAGED_TO_NATIVE:
if (frame.ji)
return frame.ji;
else {
memset (res, 0, sizeof (MonoJitInfo));
res->d.method = frame.method;
return res;
}
case FRAME_TYPE_DEBUGGER_INVOKE: {
MonoContext tmp_ctx;
/*
* The normal exception handling code can't handle this frame, so just
* skip it.
*/
ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
return ji;
}
default:
g_assert_not_reached ();
return NULL;
}
}
/* mono_find_jit_info:
*
* This function is used to gather information from @ctx. It return the
* MonoJitInfo of the corresponding function, unwinds one stack frame and
* stores the resulting context into @new_ctx. It also stores a string
* describing the stack location into @trace (if not NULL), and modifies
* the @lmf if necessary. @native_offset return the IP offset from the
* start of the function or -1 if that info is not available.
*/
MonoJitInfo *
mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
gboolean *managed)
{
gboolean managed2;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
MonoJitInfo *ji;
MonoMethod *method = NULL;
if (trace)
*trace = NULL;
if (native_offset)
*native_offset = -1;
if (managed)
*managed = FALSE;
ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
if (ji == (gpointer)-1)
return ji;
if (ji && !ji->is_trampoline)
method = jinfo_get_method (ji);
if (managed2 || (method && method->wrapper_type)) {
const char *real_ip, *start;
gint32 offset;
start = (const char *)ji->code_start;
if (!managed2)
/* ctx->ip points into native code */
real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
else
real_ip = (const char*)ip;
if ((real_ip >= start) && (real_ip <= start + ji->code_size))
offset = real_ip - start;
else
offset = -1;
if (native_offset)
*native_offset = offset;
if (managed)
if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
*managed = TRUE;
if (trace)
*trace = mono_debug_print_stack_frame (method, offset, domain);
} else {
if (trace) {
char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
*trace = g_strdup_printf ("in (unmanaged) %s", fname);
g_free (fname);
}
}
return ji;
}
/*
* mono_find_jit_info_ext:
*
* A version of mono_find_jit_info which returns all data in the StackFrameInfo
* structure.
* A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
* - These frames are used to mark managed-to-native transitions, so CTX will refer to native
* code, and new_ctx will refer to the last managed frame. The caller should unwind once more
* to obtain the last managed frame.
* If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
* On return, it will be filled with the locations where callee saved registers are saved
* by the current frame. This is returned outside of StackFrameInfo because it can be
* quite large on some platforms.
* If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
* not be set.
*/
gboolean
mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf,
host_mgreg_t **save_locations,
StackFrameInfo *frame)
{
gboolean err;
gpointer ip = MONO_CONTEXT_GET_IP (ctx);
MonoJitInfo *ji;
MonoDomain *target_domain = domain;
MonoMethod *method = NULL;
gboolean async = mono_thread_info_is_async_context ();
if (trace)
*trace = NULL;
/* Avoid costly table lookup during stack overflow */
if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
ji = prev_ji;
else
ji = mini_jit_info_table_find_ext (domain, ip, TRUE, &target_domain);
if (!target_domain)
target_domain = domain;
if (save_locations)
memset (save_locations, 0, MONO_MAX_IREGS * sizeof (host_mgreg_t*));
err = arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
if (!err)
return FALSE;
gboolean not_i2m = frame->type != FRAME_TYPE_INTERP_TO_MANAGED && frame->type != FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX;
if (not_i2m && *lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
/*
* Remove any unused lmf.
* Mask out the lower bits which might be used to hold additional information.
*/
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(TARGET_SIZEOF_VOID_P -1));
}
if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
method = jinfo_get_method (frame->ji);
if (frame->type == FRAME_TYPE_MANAGED && method) {
if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
frame->managed = TRUE;
}
if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
/*
* This type of frame is just a marker, the caller should unwind once more to get the
* last managed frame.
*/
frame->ji = NULL;
frame->method = NULL;
}
frame->native_offset = -1;
frame->domain = target_domain;
frame->async_context = async;
frame->frame_addr = MONO_CONTEXT_GET_SP (ctx);
ji = frame->ji;
if (frame->type == FRAME_TYPE_MANAGED)
frame->method = method;
if (ji && (frame->managed || (method && method->wrapper_type))) {
const char *real_ip, *start;
start = (const char *)ji->code_start;
if (frame->type == FRAME_TYPE_MANAGED)
real_ip = (const char*)ip;
else
/* ctx->ip points into native code */
real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
if ((real_ip >= start) && (real_ip <= start + ji->code_size))
frame->native_offset = real_ip - start;
else {
frame->native_offset = -1;
}
if (trace)
*trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
} else {
if (trace && frame->method) {
char *fname = mono_method_full_name (frame->method, TRUE);
*trace = g_strdup_printf ("in (unmanaged) %s", fname);
g_free (fname);
}
}
return TRUE;
}
typedef struct {
gboolean in_interp;
MonoInterpStackIter interp_iter;
gpointer last_frame_addr;
} Unwinder;
static void
unwinder_init (Unwinder *unwinder)
{
memset (unwinder, 0, sizeof (Unwinder));
}
#if defined(__GNUC__) && defined(TARGET_ARM64)
/* gcc 4.9.2 seems to miscompile this on arm64 */
static __attribute__((optimize("O0"))) gboolean
#else
static gboolean
#endif
unwinder_unwind_frame (Unwinder *unwinder,
MonoDomain *domain, MonoJitTlsData *jit_tls,
MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf,
host_mgreg_t **save_locations,
StackFrameInfo *frame)
{
gpointer parent;
if (unwinder->in_interp) {
memcpy (new_ctx, ctx, sizeof (MonoContext));
/* Process debugger invokes */
/* The DEBUGGER_INVOKE should be returned before the first interpreter frame for the invoke */
if (unwinder->last_frame_addr < (gpointer)(*lmf)) {
if (((gsize)(*lmf)->previous_lmf) & 2) {
MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
if (ext->kind == MONO_LMFEXT_DEBUGGER_INVOKE) {
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~7);
frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
return TRUE;
}
}
}
unwinder->in_interp = mini_get_interp_callbacks ()->frame_iter_next (&unwinder->interp_iter, frame);
if (frame->type == FRAME_TYPE_INTERP) {
parent = mini_get_interp_callbacks ()->frame_get_parent (frame->interp_frame);
unwinder->last_frame_addr = parent;
}
if (!unwinder->in_interp)
return unwinder_unwind_frame (unwinder, domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf, save_locations, frame);
return TRUE;
} else {
gboolean res = mono_find_jit_info_ext (domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf,
save_locations, frame);
if (!res)
return FALSE;
if (frame->type == FRAME_TYPE_INTERP_TO_MANAGED || frame->type == FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX) {
unwinder->in_interp = TRUE;
mini_get_interp_callbacks ()->frame_iter_init (&unwinder->interp_iter, frame->interp_exit_data);
}
unwinder->last_frame_addr = frame->frame_addr;
return TRUE;
}
}
/*
* This function is async-safe.
*/
static gpointer
get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
{
MonoGenericJitInfo *gi;
MonoMethod *method;
gpointer info;
if (!ji->has_generic_jit_info)
return NULL;
gi = mono_jit_info_get_generic_jit_info (ji);
if (!gi->has_this)
return NULL;
info = NULL;
/*
* Search location list if available, it contains the precise location of the
* argument for every pc offset, even if the method was interrupted while it was in
* its prolog.
*/
if (gi->nlocs) {
int offset = (gsize)MONO_CONTEXT_GET_IP (ctx) - (gsize)ji->code_start;
int i;
for (i = 0; i < gi->nlocs; ++i) {
MonoDwarfLocListEntry *entry = &gi->locations [i];
if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
if (entry->is_reg)
info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
else
info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
break;
}
}
g_assert (i < gi->nlocs);
} else {
if (gi->this_in_reg)
info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
else
info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
gi->this_offset);
}
method = jinfo_get_method (ji);
if (mono_method_get_context (method)->method_inst) {
/* A MonoMethodRuntimeGenericContext* */
return info;
} else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || m_class_is_valuetype (method->klass)) {
/* A MonoVTable* */
return info;
} else {
/* Avoid returning a managed object */
MonoObject *this_obj = (MonoObject *)info;
return this_obj->vtable;
}
}
/*
* generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
*/
static MonoGenericContext
get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
{
MonoGenericContext context = { NULL, NULL };
MonoClass *klass, *method_container_class;
MonoMethod *method;
g_assert (generic_info);
method = jinfo_get_method (ji);
g_assert (method->is_inflated);
if (mono_method_get_context (method)->method_inst) {
MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
klass = mrgctx->class_vtable->klass;
context.method_inst = mrgctx->method_inst;
g_assert (context.method_inst);
} else {
MonoVTable *vtable = (MonoVTable *)generic_info;
klass = vtable->klass;
}
//g_assert (!mono_class_is_gtd (method->klass));
if (mono_class_is_ginst (method->klass))
method_container_class = mono_class_get_generic_class (method->klass)->container_class;
else
method_container_class = method->klass;
/* class might refer to a subclass of method's class */
while (!(klass == method->klass || (mono_class_is_ginst (klass) && mono_class_get_generic_class (klass)->container_class == method_container_class))) {
klass = m_class_get_parent (klass);
g_assert (klass);
}
if (mono_class_is_ginst (klass) || mono_class_is_gtd (klass))
context.class_inst = mini_class_get_context (klass)->class_inst;
if (mono_class_is_ginst (klass))
g_assert (mono_class_has_parent_and_ignore_generics (mono_class_get_generic_class (klass)->container_class, method_container_class));
else
g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
return context;
}
static MonoMethod*
get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
{
ERROR_DECL (error);
MonoGenericContext context;
MonoMethod *method;
if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
return jinfo_get_method (ji);
context = get_generic_context_from_stack_frame (ji, generic_info);
method = jinfo_get_method (ji);
method = mono_method_get_declaring_generic_method (method);
method = mono_class_inflate_generic_method_checked (method, &context, error);
g_assert (mono_error_ok (error)); /* FIXME don't swallow the error */
return method;
}
/**
* mono_exception_walk_native_trace:
* \param ex The exception object whose frames should be walked
* \param func callback to call for each stack frame
* \param user_data data passed to the callback
* This function walks the stacktrace of an exception. For
* each frame the callback function is called with the relevant info.
* The walk ends when no more stack frames are found or when the callback
* returns a TRUE value.
*/
gboolean
mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
{
gboolean res;
MONO_ENTER_GC_UNSAFE;
res = mono_exception_walk_trace_internal (ex, func, user_data);
MONO_EXIT_GC_UNSAFE;
return res;
}
gboolean
mono_exception_walk_trace_internal (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
{
MONO_REQ_GC_UNSAFE_MODE;
MonoDomain *domain = mono_domain_get ();
MonoArray *ta = ex->trace_ips;
int len, i;
if (ta == NULL)
return FALSE;
len = mono_array_length (ta) / TRACE_IP_ENTRY_SIZE;
for (i = 0; i < len; i++) {
ExceptionTraceIp trace_ip;
memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
gpointer ip = trace_ip.ip;
gpointer generic_info = trace_ip.generic_info;
MonoJitInfo *ji = NULL;
if (trace_ip.ji) {
ji = trace_ip.ji;
} else {
ji = mono_jit_info_table_find (domain, ip);
}
if (ji == NULL) {
gboolean r;
MONO_ENTER_GC_SAFE;
r = func (NULL, ip, 0, FALSE, user_data);
MONO_EXIT_GC_SAFE;
if (r)
return TRUE;
} else {
MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
return TRUE;
}
}
return len > 0;
}
MonoArray *
ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
{
ERROR_DECL (error);
MonoDomain *domain = mono_domain_get ();
MonoArray *res;
MonoArray *ta = exc->trace_ips;
MonoDebugSourceLocation *location;
int i, len;
if (ta == NULL) {
/* Exception is not thrown yet */
res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, 0, error);
mono_error_set_pending_exception (error);
return res;
}
len = mono_array_length (ta) / TRACE_IP_ENTRY_SIZE;
res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0, error);
if (mono_error_set_pending_exception (error))
return NULL;
for (i = skip; i < len; i++) {
MonoJitInfo *ji;
MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, error);
if (!mono_error_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
ExceptionTraceIp trace_ip;
memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
gpointer ip = trace_ip.ip;
gpointer generic_info = trace_ip.generic_info;
MonoMethod *method;
if (trace_ip.ji) {
ji = trace_ip.ji;
} else {
ji = mono_jit_info_table_find (domain, ip);
if (ji == NULL) {
/* Unmanaged frame */
mono_array_setref (res, i, sf);
continue;
}
}
g_assert (ji != NULL);
if (mono_llvm_only || !generic_info)
/* Can't resolve actual method */
method = jinfo_get_method (ji);
else
method = get_method_from_stack_frame (ji, generic_info);
if (jinfo_get_method (ji)->wrapper_type) {
char *s;
sf->method = NULL;
s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
MonoString *name = mono_string_new_checked (domain, s, error);
g_free (s);
if (!is_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
MONO_OBJECT_SETREF (sf, internal_method_name, name);
}
else {
MonoReflectionMethod *rm = mono_method_get_object_checked (domain, method, NULL, error);
if (!mono_error_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
MONO_OBJECT_SETREF (sf, method, rm);
}
sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
sf->method_address = (gsize) ji->code_start;
sf->native_offset = (char *)ip - (char *)ji->code_start;
/*
* mono_debug_lookup_source_location() returns both the file / line number information
* and the IL offset. Note that computing the IL offset is already an expensive
* operation, so we shouldn't call this method twice.
*/
location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
if (location) {
sf->il_offset = location->il_offset;
} else {
SeqPoint sp;
if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
sf->il_offset = sp.il_offset;
else
sf->il_offset = -1;
}
if (need_file_info) {
if (location && location->source_file) {
MonoString *filename = mono_string_new_checked (domain, location->source_file, error);
if (!is_ok (error)) {
mono_error_set_pending_exception (error);
return NULL;
}
MONO_OBJECT_SETREF (sf, filename, filename);
sf->line = location->row;
sf->column = location->column;
} else {
sf->line = sf->column = 0;
sf->filename = NULL;
}
}
mono_debug_free_source_location (location);
mono_array_setref (res, i, sf);
}
return res;
}
static void
mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
{
if (!start_ctx) {
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
if (jit_tls && jit_tls->orig_ex_ctx_set)
start_ctx = &jit_tls->orig_ex_ctx;
}
mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
}
/**
* mono_walk_stack_with_ctx:
* Unwind the current thread starting at \p start_ctx.
* If \p start_ctx is null, we capture the current context.
*/
void
mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
{
MonoContext extra_ctx;
MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
MONO_ARCH_CONTEXT_DEF
if (!thread || !thread->jit_data)
return;
if (!start_ctx) {
mono_arch_flush_register_windows ();
MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
start_ctx = &extra_ctx;
}
mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data, FALSE);
}
/**
* mono_walk_stack_with_state:
* Unwind a thread described by \p state.
*
* State must be valid (state->valid == TRUE).
*
* If you are using this function to unwind another thread, make sure it is suspended.
*
* If \p state is null, we capture the current context.
*/
void
mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
{
MonoThreadUnwindState extra_state;
if (!state) {
g_assert (!mono_thread_info_is_async_context ());
if (!mono_thread_state_init_from_current (&extra_state))
return;
state = &extra_state;
}
g_assert (state->valid);
if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
/* Not attached */
return;
mono_walk_stack_full (func,
&state->ctx,
(MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
(MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
(MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
unwind_options, user_data, FALSE);
}
void
mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
{
MonoThreadUnwindState state;
if (!mono_thread_state_init_from_current (&state))
return;
mono_walk_stack_with_state (func, &state, options, user_data);
}
/**
* mono_walk_stack_full:
* \param func callback to call for each stack frame
* \param domain starting appdomain, can be NULL to use the current domain
* \param unwind_options what extra information the unwinder should gather
* \param start_ctx starting state of the stack walk, can be NULL.
* \param thread the thread whose stack to walk, can be NULL to use the current thread
* \param lmf the LMF of \p thread, can be NULL to use the LMF of the current thread
* \param user_data data passed to the callback
* \param crash_context tells us that we're in a context where it's not safe to lock or allocate
* This function walks the stack of a thread, starting from the state
* represented by \p start_ctx. For each frame the callback
* function is called with the relevant info. The walk ends when no more
* managed stack frames are found or when the callback returns a TRUE value.
*/
static void
mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data, gboolean crash_context)
{
gint il_offset;
MonoContext ctx, new_ctx;
StackFrameInfo frame;
gboolean res;
host_mgreg_t *reg_locations [MONO_MAX_IREGS];
host_mgreg_t *new_reg_locations [MONO_MAX_IREGS];
gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
gboolean async = mono_thread_info_is_async_context ();
Unwinder unwinder;
#ifndef TARGET_WASM
if (mono_llvm_only) {
GSList *l, *ips;
if (async)
return;
ips = get_unwind_backtrace ();
for (l = ips; l; l = l->next) {
guint8 *ip = (guint8*)l->data;
memset (&frame, 0, sizeof (StackFrameInfo));
frame.ji = mini_jit_info_table_find (domain, ip, &frame.domain);
if (!frame.ji || frame.ji->is_trampoline)
continue;
frame.type = FRAME_TYPE_MANAGED;
frame.method = jinfo_get_method (frame.ji);
// FIXME: Cannot lookup the actual method
frame.actual_method = frame.method;
if (frame.type == FRAME_TYPE_MANAGED) {
if (!frame.method->wrapper_type || frame.method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
frame.managed = TRUE;
}
frame.native_offset = ip - (guint8*)frame.ji->code_start;
frame.il_offset = -1;
if (func (&frame, NULL, user_data))
break;
}
g_free (ips);
return;
}
#endif
if (!start_ctx) {
g_warning ("start_ctx required for stack walk");
return;
}
if (!domain) {
g_warning ("domain required for stack walk");
return;
}
if (!jit_tls) {
g_warning ("jit_tls required for stack walk");
return;
}
/*The LMF will be null if the target have no managed frames.*/
/* g_assert (lmf); */
if (async && (unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD)) {
g_warning ("async && (unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) not legal");
return;
}
memcpy (&ctx, start_ctx, sizeof (MonoContext));
memset (reg_locations, 0, sizeof (reg_locations));
unwinder_init (&unwinder);
while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
frame.lmf = lmf;
res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
if (!res)
return;
if (frame.type == FRAME_TYPE_TRAMPOLINE)
goto next;
if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
MonoDebugSourceLocation *source = NULL;
// Don't do this when we can be in a signal handler
if (!crash_context)
source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
if (source) {
il_offset = source->il_offset;
} else {
MonoSeqPointInfo *seq_points = NULL;
// It's more reliable to look into the global cache if possible
if (crash_context)
seq_points = (MonoSeqPointInfo *) frame.ji->seq_points;
else
seq_points = mono_get_seq_points (domain, jinfo_get_method (frame.ji));
SeqPoint sp;
if (seq_points && mono_seq_point_find_prev_by_native_offset (seq_points, frame.native_offset, &sp))
il_offset = sp.il_offset;
else
il_offset = -1;
}
mono_debug_free_source_location (source);
} else
il_offset = -1;
frame.il_offset = il_offset;
if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
} else {
frame.actual_method = frame.method;
}
if (get_reg_locations)
frame.reg_locations = reg_locations;
if (func (&frame, &ctx, user_data))
return;
next:
if (get_reg_locations) {
for (int i = 0; i < MONO_MAX_IREGS; ++i)
if (new_reg_locations [i])
reg_locations [i] = new_reg_locations [i];
}
ctx = new_ctx;
}
}
#ifdef DISABLE_CRASH_REPORTING
static void
mono_summarize_managed_stack (MonoThreadSummary *out)
{
return;
}
static void
mono_summarize_unmanaged_stack (MonoThreadSummary *out)
{
return;
}
static void
mono_summarize_exception (MonoException *exc, MonoThreadSummary *out)
{
return;
}
static void
mono_crash_reporting_register_native_library (const char *module_path, const char *module_name)
{
return;
}
#else
typedef struct {
MonoFrameSummary *frames;
int num_frames;
int max_frames;
MonoStackHash *hashes;
const char *error;
} MonoSummarizeUserData;
static void
copy_summary_string_safe (char *in, const char *out)
{
for (int i=0; i < MONO_MAX_SUMMARY_NAME_LEN; i++) {
in [i] = out [i];
if (out [i] == '\0')
return;
}
// Overflowed
in [MONO_MAX_SUMMARY_NAME_LEN] = '\0';
return;
}
static GHashTable *native_library_whitelist;
static void
mono_crash_reporting_register_native_library (const char *module_path, const char *module_name)
{
Dl_info info;
if (!native_library_whitelist) {
native_library_whitelist = g_hash_table_new_full (NULL, NULL, NULL, g_free);
dladdr ((void*) mono_crash_reporting_register_native_library, &info);
if (info.dli_fname && strlen(info.dli_fname) > 0)
g_hash_table_insert (native_library_whitelist, g_strdup (info.dli_fname), g_strdup ("mono"));
}
// Examples: libsystem_pthread.dylib -> "pthread"
// Examples: libsystem_platform.dylib -> "platform"
// Examples: mono-sgen -> "mono" from above line
g_hash_table_insert (native_library_whitelist, g_strdup (module_path), g_strdup (module_name));
}
static gboolean
mono_make_portable_ip (intptr_t in_ip, intptr_t module_base)
{
// FIXME: Make generalize away from llvm tools?
// So lldb starts the pointer base at 0x100000000
// and expects to get pointers as (offset + constant)
//
// Quirk shared by:
// /usr/bin/symbols -- symbols version: @(#)PROGRAM:symbols PROJECT:SamplingTools-63501
// *CoreSymbolicationDT.framework version: 63750*/
intptr_t offset = in_ip - module_base;
intptr_t magic_value = offset + 0x100000000;
return magic_value;
}
static gboolean
check_whitelisted_module (const char *in_name, const char **out_module)
{
if (!native_library_whitelist) {
if (g_str_has_suffix (in_name, "mono-sgen")) {
if (out_module)
*out_module = "mono";
return TRUE;
}
return FALSE;
}
GHashTableIter iter;
char *file_suffix;
char *module_suffix;
g_hash_table_iter_init (&iter, native_library_whitelist);
while (g_hash_table_iter_next (&iter, (gpointer *) &file_suffix, (gpointer *) &module_suffix)) {
if (!g_str_has_suffix (in_name, file_suffix))
continue;
if (out_module)
*out_module = module_suffix;
return TRUE;
}
/*fprintf (stderr, "%s == %s\n", info.dli_fname, *out_module);*/
return FALSE;
}
static gboolean
mono_get_portable_ip (intptr_t in_ip, intptr_t *out_ip, const char **out_module, char *out_name)
{
// Note: it's not safe for us to be interrupted while inside of dl_addr, because if we
// try to call dl_addr while interrupted while inside the lock, we will try to take a
// non-recursive lock twice on this thread, and will deadlock.
Dl_info info;
gboolean success = dladdr ((void*)in_ip, &info);
if (!success)
return FALSE;
if (!check_whitelisted_module (info.dli_fname, out_module))
return FALSE;
*out_ip = mono_make_portable_ip (in_ip, (intptr_t) info.dli_fbase);
#ifndef MONO_PRIVATE_CRASHES
if (info.dli_saddr && out_name)
copy_summary_string_safe (out_name, info.dli_sname);
#endif
return TRUE;
}
static guint64
summarize_offset_free_hash (guint64 accum, MonoFrameSummary *frame)
{
if (!frame->is_managed)
return accum;
// See: mono_ptrarray_hash
guint64 hash_accum = accum;
// The assembly and the method token, no offsets
hash_accum += mono_metadata_str_hash (frame->str_descr);
hash_accum += frame->managed_data.token;
return hash_accum;
}
static guint64
summarize_offset_rich_hash (guint64 accum, MonoFrameSummary *frame)
{
// See: mono_ptrarray_hash
guint64 hash_accum = accum;
if (!frame->is_managed) {
hash_accum += frame->unmanaged_data.ip;
} else {
hash_accum += mono_metadata_str_hash (frame->str_descr);
hash_accum += frame->managed_data.token;
hash_accum += frame->managed_data.native_offset;
}
return hash_accum;
}
static gboolean
summarize_frame_internal (MonoMethod *method, gpointer ip, size_t native_offset, int il_offset, gboolean managed, gpointer user_data)
{
MonoSummarizeUserData *ud = (MonoSummarizeUserData *) user_data;
gboolean valid_state = ud->num_frames + 1 < ud->max_frames;
if (!valid_state) {
ud->error = "Exceeded the maximum number of frames";
return TRUE;
}
MonoFrameSummary *dest = &ud->frames [ud->num_frames];
dest->unmanaged_data.ip = (intptr_t) ip;
dest->is_managed = managed;
if (method && method->wrapper_type != MONO_WRAPPER_NONE && method->wrapper_type < MONO_WRAPPER_NUM) {
dest->is_managed = FALSE;
dest->unmanaged_data.has_name = TRUE;
copy_summary_string_safe (dest->str_descr, mono_wrapper_type_to_str (method->wrapper_type));
}
#ifndef MONO_PRIVATE_CRASHES
if (method)
dest->managed_data.name = (char *) method->name;
#endif
if (managed) {
if (!method) {
ud->error = "Managed method frame, but no provided managed method";
return TRUE;
}
MonoImage *image = mono_class_get_image (method->klass);
// Used for hashing, more stable across rebuilds than using GUID
copy_summary_string_safe (dest->str_descr, image->assembly_name);
dest->managed_data.guid = image->guid;
dest->managed_data.native_offset = native_offset;
dest->managed_data.token = method->token;
dest->managed_data.il_offset = il_offset;
} else {
dest->managed_data.token = -1;
}
ud->hashes->offset_free_hash = summarize_offset_free_hash (ud->hashes->offset_free_hash, dest);
ud->hashes->offset_rich_hash = summarize_offset_rich_hash (ud->hashes->offset_rich_hash, dest);
// We return FALSE, so we're continuing walking
// And we increment the pointer because we're done with this cell in the array
ud->num_frames++;
return FALSE;
}
static gboolean
summarize_frame_managed_walk (MonoMethod *method, gpointer ip, size_t native_offset, gboolean managed, gpointer user_data)
{
int il_offset = -1;
if (managed && method) {
MonoDebugSourceLocation *location = mono_debug_lookup_source_location (method, native_offset, mono_domain_get ());
if (location) {
il_offset = location->il_offset;
mono_debug_free_source_location (location);
}
}
return summarize_frame_internal (method, ip, native_offset, il_offset, managed, user_data);
}
static gboolean
summarize_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
MonoSummarizeUserData *ud = (MonoSummarizeUserData *) data;
// Don't record trampolines between managed frames
if (frame->ji && frame->ji->is_trampoline)
return TRUE;
if (frame->ji && (frame->ji->is_trampoline || frame->ji->async))
return FALSE; // Keep unwinding
intptr_t ip = 0x0;
mono_get_portable_ip ((intptr_t) MONO_CONTEXT_GET_IP (ctx), &ip, NULL, NULL);
// Don't need to handle return status "success" because this ip is stored below only, NULL is okay
gboolean is_managed = (frame->type == FRAME_TYPE_MANAGED || frame->type == FRAME_TYPE_INTERP);
MonoMethod *method = NULL;
if (frame && frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
method = jinfo_get_method (frame->ji);
if (is_managed)
method = jinfo_get_method (frame->ji);
return summarize_frame_internal (method, (gpointer) ip, frame->native_offset, frame->il_offset, is_managed, data);
}
static void
mono_summarize_exception (MonoException *exc, MonoThreadSummary *out)
{
memset (out, 0, sizeof (MonoThreadSummary));
MonoSummarizeUserData data;
memset (&data, 0, sizeof (MonoSummarizeUserData));
data.max_frames = MONO_MAX_SUMMARY_FRAMES;
data.num_frames = 0;
data.frames = out->managed_frames;
data.hashes = &out->hashes;
mono_exception_walk_trace (exc, summarize_frame_managed_walk, &data);
out->num_managed_frames = data.num_frames;
}
static void
mono_summarize_managed_stack (MonoThreadSummary *out)
{
MonoSummarizeUserData data;
memset (&data, 0, sizeof (MonoSummarizeUserData));
data.max_frames = MONO_MAX_SUMMARY_FRAMES;
data.num_frames = 0;
data.frames = out->managed_frames;
data.hashes = &out->hashes;
// FIXME: collect stack pointer for both and sort frames by SP
// so people can see relative ordering of both managed and unmanaged frames.
//
// Summarize managed stack
//
mono_walk_stack_full (summarize_frame, out->ctx, out->domain, out->jit_tls, out->lmf, MONO_UNWIND_LOOKUP_IL_OFFSET, &data, TRUE);
out->num_managed_frames = data.num_frames;
if (data.error != NULL)
out->error_msg = data.error;
}
// Always runs on the dumped thread
static void
mono_summarize_unmanaged_stack (MonoThreadSummary *out)
{
MONO_ARCH_CONTEXT_DEF
//
// Summarize unmanaged stack
//
#ifdef HAVE_BACKTRACE_SYMBOLS
intptr_t frame_ips [MONO_MAX_SUMMARY_FRAMES];
out->num_unmanaged_frames = backtrace ((void **)frame_ips, MONO_MAX_SUMMARY_FRAMES);
for (int i =0; i < out->num_unmanaged_frames; ++i) {
intptr_t ip = frame_ips [i];
MonoFrameSummary *frame = &out->unmanaged_frames [i];
int success = mono_get_portable_ip (ip, &frame->unmanaged_data.ip, &frame->unmanaged_data.module, (char *) frame->str_descr);
if (!success)
continue;
if (out->unmanaged_frames [i].str_descr [0] != '\0')
out->unmanaged_frames [i].unmanaged_data.has_name = TRUE;
}
#endif
out->lmf = mono_get_lmf ();
MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
out->jit_tls = thread->jit_data;
out->domain = mono_domain_get ();
if (!out->ctx) {
out->ctx = &out->ctx_mem;
mono_arch_flush_register_windows ();
MONO_INIT_CONTEXT_FROM_FUNC (out->ctx, mono_summarize_unmanaged_stack);
}
return;
}
#endif
MonoBoolean
ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
MonoReflectionMethod **method,
gint32 *iloffset, gint32 *native_offset,
MonoString **file, gint32 *line, gint32 *column)
{
ERROR_DECL (error);
MonoDomain *domain = mono_domain_get ();
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
MonoLMF *lmf = mono_get_lmf ();
MonoJitInfo *ji = NULL;
MonoContext ctx, new_ctx;
MonoDebugSourceLocation *location;
MonoMethod *jmethod = NULL, *actual_method;
StackFrameInfo frame;
gboolean res;
Unwinder unwinder;
int il_offset = -1;
MONO_ARCH_CONTEXT_DEF;
if (mono_llvm_only) {
GSList *l, *ips;
MonoDomain *frame_domain;
guint8 *frame_ip = NULL;
/* FIXME: Generalize this code with an interface which returns an array of StackFrame structures */
jmethod = NULL;
ips = get_unwind_backtrace ();
for (l = ips; l && skip >= 0; l = l->next) {
guint8 *ip = (guint8*)l->data;
frame_ip = ip;
ji = mini_jit_info_table_find (mono_domain_get (), ip, &frame_domain);
if (!ji || ji->is_trampoline)
continue;
/* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
jmethod = jinfo_get_method (ji);
if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
continue;
skip--;
}
g_slist_free (ips);
if (!jmethod || !l)
return FALSE;
/* No way to resolve generic instances */
actual_method = jmethod;
*native_offset = frame_ip - (guint8*)ji->code_start;
} else {
mono_arch_flush_register_windows ();
MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
unwinder_init (&unwinder);
new_ctx = ctx;
do {
ctx = new_ctx;
res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
if (!res)
return FALSE;
switch (frame.type) {
case FRAME_TYPE_MANAGED_TO_NATIVE:
case FRAME_TYPE_DEBUGGER_INVOKE:
case FRAME_TYPE_TRAMPOLINE:
case FRAME_TYPE_INTERP_TO_MANAGED:
case FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX:
continue;
case FRAME_TYPE_INTERP:
case FRAME_TYPE_MANAGED:
ji = frame.ji;
*native_offset = frame.native_offset;
/* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
jmethod = jinfo_get_method (ji);
if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
continue;
skip--;
break;
default:
g_assert_not_reached ();
}
} while (skip >= 0);
if (frame.type == FRAME_TYPE_INTERP) {
jmethod = frame.method;
actual_method = frame.actual_method;
} else {
actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
}
}
MonoReflectionMethod *rm = mono_method_get_object_checked (domain, actual_method, NULL, error);
if (!mono_error_ok (error)) {
mono_error_set_pending_exception (error);
return FALSE;
}
mono_gc_wbarrier_generic_store (method, (MonoObject*) rm);
if (il_offset != -1) {
location = mono_debug_lookup_source_location_by_il (jmethod, il_offset, domain);
} else {
location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
}
if (location)
*iloffset = location->il_offset;
else
*iloffset = 0;
if (need_file_info) {
if (location) {
MonoString *filename = mono_string_new_checked (domain, location->source_file, error);
if (!is_ok (error)) {
mono_error_set_pending_exception (error);
return FALSE;
}
mono_gc_wbarrier_generic_store (file, (MonoObject*)filename);
*line = location->row;
*column = location->column;
} else {
*file = NULL;
*line = *column = 0;
}
}
mono_debug_free_source_location (location);
return TRUE;
}
static MonoClass*
get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
{
ERROR_DECL (error);
MonoClass *catch_class = ei->data.catch_class;
MonoType *inflated_type;
MonoGenericContext context;
/*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
return NULL;
if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
return catch_class;
context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
/* FIXME: we shouldn't inflate but instead put the
type in the rgctx and fetch it from there. It
might be a good idea to do this lazily, i.e. only
when the exception is actually thrown, so as not to
waste space for exception clauses which might never
be encountered. */
inflated_type = mono_class_inflate_generic_type_checked (m_class_get_byval_arg (catch_class), &context, error);
mono_error_assert_ok (error); /* FIXME don't swallow the error */
catch_class = mono_class_from_mono_type (inflated_type);
mono_metadata_free_type (inflated_type);
return catch_class;
}
/*
* mini_jit_info_table_find_ext:
*
* Same as mono_jit_info_table_find, but search all the domains of the current thread
* if ADDR is not found in DOMAIN. The domain where the method was found is stored into
* OUT_DOMAIN if it is not NULL.
*/
MonoJitInfo*
mini_jit_info_table_find_ext (MonoDomain *domain, gpointer addr, gboolean allow_trampolines, MonoDomain **out_domain)
{
MonoJitInfo *ji;
MonoInternalThread *t = mono_thread_internal_current ();
gpointer *refs;
if (out_domain)
*out_domain = NULL;
ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
if (ji) {
if (out_domain)
*out_domain = domain;
return ji;
}
/* maybe it is shared code, so we also search in the root domain */
if (domain != mono_get_root_domain ()) {
ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
if (ji) {
if (out_domain)
*out_domain = mono_get_root_domain ();
return ji;
}
}
if (!t)
return NULL;
refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
for (; refs && *refs; refs++) {
if (*refs != domain && *refs != mono_get_root_domain ()) {
ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
if (ji) {
if (out_domain)
*out_domain = (MonoDomain*) *refs;
return ji;
}
}
}
return NULL;
}
MonoJitInfo*
mini_jit_info_table_find (MonoDomain *domain, gpointer addr, MonoDomain **out_domain)
{
return mini_jit_info_table_find_ext (domain, addr, FALSE, out_domain);
}
/* Class lazy loading functions */
static GENERATE_GET_CLASS_WITH_CACHE (runtime_compat_attr, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute")
/*
* wrap_non_exception_throws:
*
* Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
* WrapNonExceptionThrows flag set.
*/
static gboolean
wrap_non_exception_throws (MonoMethod *m)
{
ERROR_DECL (error);
MonoAssembly *ass = m_class_get_image (m->klass)->assembly;
MonoCustomAttrInfo* attrs;
MonoClass *klass;
int i;
gboolean val = FALSE;
if (m->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD) {
MonoDynamicMethod *dm = (MonoDynamicMethod *)m;
if (dm->assembly)
ass = dm->assembly;
}
g_assert (ass);
if (ass->wrap_non_exception_throws_inited)
return ass->wrap_non_exception_throws;
klass = mono_class_get_runtime_compat_attr_class ();
attrs = mono_custom_attrs_from_assembly_checked (ass, FALSE, error);
mono_error_cleanup (error); /* FIXME don't swallow the error */
if (attrs) {
for (i = 0; i < attrs->num_attrs; ++i) {
MonoCustomAttrEntry *attr = &attrs->attrs [i];
const gchar *p;
int num_named, named_type, name_len;
char *name;
if (!attr->ctor || attr->ctor->klass != klass)
continue;
/* Decode the RuntimeCompatibilityAttribute. See reflection.c */
p = (const char*)attr->data;
g_assert (read16 (p) == 0x0001);
p += 2;
num_named = read16 (p);
if (num_named != 1)
continue;
p += 2;
named_type = *p;
p ++;
/* data_type = *p; */
p ++;
/* Property */
if (named_type != 0x54)
continue;
name_len = mono_metadata_decode_blob_size (p, &p);
name = (char *)g_malloc (name_len + 1);
memcpy (name, p, name_len);
name [name_len] = 0;
p += name_len;
g_assert (!strcmp (name, "WrapNonExceptionThrows"));
g_free (name);
/* The value is a BOOLEAN */
val = *p;
}
mono_custom_attrs_free (attrs);
}
ass->wrap_non_exception_throws = val;
mono_memory_barrier ();
ass->wrap_non_exception_throws_inited = TRUE;
return val;
}
#define MAX_UNMANAGED_BACKTRACE 128
static MonoArray*
build_native_trace (MonoError *error)
{
error_init (error);
/* This puppy only makes sense on mobile, IOW, ARM. */
#if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
MonoArray *res;
void *native_trace [MAX_UNMANAGED_BACKTRACE];
int size = -1;
MONO_ENTER_GC_SAFE;
size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
MONO_EXIT_GC_SAFE;
int i;
if (!size)
return NULL;
res = mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, size, error);
return_val_if_nok (error, NULL);
for (i = 0; i < size; i++)
mono_array_set (res, gpointer, i, native_trace [i]);
return res;
#else
return NULL;
#endif
}
/* This can be called more than once on a MonoException. */
static void
setup_stack_trace (MonoException *mono_ex, GSList **dynamic_methods, GList *trace_ips)
{
if (mono_ex) {
GList *trace_ips_copy = g_list_copy (trace_ips);
trace_ips_copy = g_list_reverse (trace_ips_copy);
ERROR_DECL (error);
MonoArray *ips_arr = mono_glist_to_array (trace_ips_copy, mono_defaults.int_class, error);
mono_error_assert_ok (error);
MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace (error));
mono_error_assert_ok (error);
if (*dynamic_methods) {
/* These methods could go away anytime, so save a reference to them in the exception object */
GSList *l;
MonoMList *list = (MonoMList*)mono_ex->dynamic_methods;
for (l = *dynamic_methods; l; l = l->next) {
guint32 dis_link;
MonoDomain *domain = mono_domain_get ();
if (domain->method_to_dyn_method) {
mono_domain_lock (domain);
dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
mono_domain_unlock (domain);
if (dis_link) {
MonoObject *o = mono_gchandle_get_target (dis_link);
if (o) {
list = mono_mlist_prepend_checked (list, o, error);
mono_error_assert_ok (error);
}
}
}
}
MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
g_slist_free (*dynamic_methods);
*dynamic_methods = NULL;
}
g_list_free (trace_ips_copy);
}
}
typedef enum {
MONO_FIRST_PASS_UNHANDLED,
MONO_FIRST_PASS_CALLBACK_TO_NATIVE,
MONO_FIRST_PASS_HANDLED,
} MonoFirstPassResult;
/*
* handle_exception_first_pass:
*
* The first pass of exception handling. Unwind the stack until a catch
* clause which can catch OBJ is found. Store the index of the filter clause
* which caught the exception into OUT_FILTER_IDX. Return
* \c MONO_FIRST_PASS_HANDLED if the exception is caught,
* \c MONO_FIRST_PASS_UNHANDLED otherwise, unless there is a native-to-managed
* wrapper and an exception handling callback is installed (in which case
* return \c MONO_FIRST_PASS_CALLBACK_TO_NATIVE).
*/
static MonoFirstPassResult
handle_exception_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception, StackFrameInfo *catch_frame)
{
ERROR_DECL (error);
MonoDomain *domain = mono_domain_get ();
MonoJitInfo *ji = NULL;
static int (*call_filter) (MonoContext *, gpointer) = NULL;
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
MonoLMF *lmf = mono_get_lmf ();
GList *trace_ips = NULL;
GSList *dynamic_methods = NULL;
MonoException *mono_ex;
gboolean stack_overflow = FALSE;
MonoContext initial_ctx;
MonoMethod *method;
int frame_count = 0;
gint32 filter_idx;
int i;
MonoObject *ex_obj;
Unwinder unwinder;
gboolean in_interp;
MonoFirstPassResult result = MONO_FIRST_PASS_UNHANDLED;
g_assert (ctx != NULL);
if (obj == (MonoObject *)domain->stack_overflow_ex)
stack_overflow = TRUE;
mono_ex = (MonoException*)obj;
MonoArray *initial_trace_ips = mono_ex->trace_ips;
if (initial_trace_ips) {
int len = mono_array_length (initial_trace_ips) / TRACE_IP_ENTRY_SIZE;
// If we catch in managed/non-wrapper, we don't save the catching frame
if (!mono_ex->caught_in_unmanaged)
len -= 1;
for (i = 0; i < len; i++) {
for (int j = 0; j < TRACE_IP_ENTRY_SIZE; ++j) {
gpointer p = mono_array_get (initial_trace_ips, gpointer, (i * TRACE_IP_ENTRY_SIZE) + j);
trace_ips = g_list_prepend (trace_ips, p);
}
}
}
// Reset the state because we're making it be caught somewhere
if (mono_ex->caught_in_unmanaged)
MONO_OBJECT_SETREF (mono_ex, caught_in_unmanaged, 0);
if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, error)) {
mono_error_assert_ok (error);
mono_ex = NULL;
}
if (!call_filter)
call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
g_assert (jit_tls->end_of_stack);
g_assert (jit_tls->abort_func);
if (out_filter_idx)
*out_filter_idx = -1;
if (out_ji)
*out_ji = NULL;
if (out_prev_ji)
*out_prev_ji = NULL;
filter_idx = 0;
initial_ctx = *ctx;
unwinder_init (&unwinder);
while (1) {
MonoContext new_ctx;
guint32 free_stack;
int clause_index_start = 0;
gboolean unwind_res = TRUE;
StackFrameInfo frame;
if (out_prev_ji)
*out_prev_ji = ji;
unwind_res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
if (!unwind_res) {
setup_stack_trace (mono_ex, &dynamic_methods, trace_ips);
g_list_free (trace_ips);
return result;
}
switch (frame.type) {
case FRAME_TYPE_DEBUGGER_INVOKE:
case FRAME_TYPE_MANAGED_TO_NATIVE:
case FRAME_TYPE_TRAMPOLINE:
case FRAME_TYPE_INTERP_TO_MANAGED:
case FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX:
*ctx = new_ctx;
continue;
case FRAME_TYPE_INTERP:
case FRAME_TYPE_MANAGED:
break;
default:
g_assert_not_reached ();
break;
}
in_interp = frame.type == FRAME_TYPE_INTERP;
ji = frame.ji;
gpointer ip;
if (in_interp)
ip = (guint8*)ji->code_start + frame.native_offset;
else
ip = MONO_CONTEXT_GET_IP (ctx);
frame_count ++;
method = jinfo_get_method (ji);
//printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
g_error ("A native frame was found while unwinding the stack after an exception.\n"
"The native frame called the managed method:\n%s\n",
mono_method_full_name (method, TRUE));
}
if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
// avoid giant stack traces during a stack overflow
if (frame_count < 1000) {
trace_ips = g_list_prepend (trace_ips, ip);
trace_ips = g_list_prepend (trace_ips, get_generic_info_from_stack_frame (ji, ctx));
trace_ips = g_list_prepend (trace_ips, ji);
}
}
if (method->dynamic)
dynamic_methods = g_slist_prepend (dynamic_methods, method);
if (stack_overflow) {
free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
} else {
free_stack = 0xffffff;
}
if (method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED && ftnptr_eh_callback) {
result = MONO_FIRST_PASS_CALLBACK_TO_NATIVE;
}
for (i = clause_index_start; i < ji->num_clauses; i++) {
MonoJitExceptionInfo *ei = &ji->clauses [i];
gboolean filtered = FALSE;
/*
* During stack overflow, wait till the unwinding frees some stack
* space before running handlers/finalizers.
*/
if (free_stack <= (64 * 1024))
continue;
if (is_address_protected (ji, ei, ip)) {
/* catch block */
MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
/*
* Have to unwrap RuntimeWrappedExceptions if the
* method's assembly doesn't have a RuntimeCompatibilityAttribute.
*/
if (non_exception && !wrap_non_exception_throws (method))
ex_obj = non_exception;
else
ex_obj = obj;
if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
setup_stack_trace (mono_ex, &dynamic_methods, trace_ips);
#ifndef DISABLE_PERFCOUNTERS
mono_atomic_inc_i32 (&mono_perfcounters->exceptions_filters);
#endif
if (!ji->is_interp) {
#ifndef MONO_CROSS_COMPILE
#ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
if (ji->from_llvm)
MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
else
/* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
*((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
#else
g_assert (!ji->from_llvm);
/* store the exception object in bp + ei->exvar_offset */
*((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
#endif
#endif
#ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
/*
* Pass the original il clause index to the landing pad so it can
* branch to the landing pad associated with the il clause.
* This is needed because llvm compiled code assumes that the EH
* code always branches to the innermost landing pad.
*/
if (ji->from_llvm)
MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
#endif
}
mini_get_dbg_callbacks ()->begin_exception_filter (mono_ex, ctx, &initial_ctx);
if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
jit_tls->orig_ex_ctx_set = TRUE;
MONO_PROFILER_RAISE (exception_clause, (method, i, (MonoExceptionEnum)ei->flags, ex_obj));
jit_tls->orig_ex_ctx_set = FALSE;
}
if (ji->is_interp) {
filtered = mini_get_interp_callbacks ()->run_filter (&frame, (MonoException*)ex_obj, i, ei->data.filter);
} else {
filtered = call_filter (ctx, ei->data.filter);
}
mini_get_dbg_callbacks ()->end_exception_filter (mono_ex, ctx, &initial_ctx);
if (filtered && out_filter_idx)
*out_filter_idx = filter_idx;
if (out_ji)
*out_ji = ji;
filter_idx ++;
if (filtered) {
g_list_free (trace_ips);
/* mono_debugger_agent_handle_exception () needs this */
mini_set_abort_threshold (&frame);
MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
frame.native_offset = (char*)ei->handler_start - (char*)ji->code_start;
*catch_frame = frame;
result = MONO_FIRST_PASS_HANDLED;
return result;
}
}
ERROR_DECL_VALUE (isinst_error);
error_init (&isinst_error);
if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (ex_obj, catch_class, error)) {
setup_stack_trace (mono_ex, &dynamic_methods, trace_ips);
g_list_free (trace_ips);
if (out_ji)
*out_ji = ji;
/* mono_debugger_agent_handle_exception () needs this */
if (!in_interp)
MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
frame.native_offset = (char*)ei->handler_start - (char*)ji->code_start;
*catch_frame = frame;
result = MONO_FIRST_PASS_HANDLED;
return result;
}
mono_error_cleanup (&isinst_error);
}
}
*ctx = new_ctx;
}
g_assert_not_reached ();
}
/*
* We implement delaying of aborts when in finally blocks by reusing the
* abort protected block mechanism. The problem is that when throwing an
* exception in a finally block we don't get to exit the protected block.
* We exit it here when unwinding. Given that the order of the clauses
* in the jit info is from inner clauses to the outer clauses, when we
* want to exit the finally blocks inner to the clause that handles the
* exception, we need to search up to its index.
*
* FIXME We should do this inside interp, but with mixed mode we can
* resume directly, without giving control back to the interp.
*/
static void
interp_exit_finally_abort_blocks (MonoJitInfo *ji, int start_clause, int end_clause, gpointer ip)
{
int i;
for (i = start_clause; i < end_clause; i++) {
MonoJitExceptionInfo *ei = &ji->clauses [i];
if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY &&
ip >= ei->handler_start &&
ip < ei->data.handler_end) {
mono_threads_end_abort_protected_block ();
}
}
}
static MonoException *
mono_get_exception_runtime_wrapped_checked (MonoObject *wrapped_exception_raw, MonoError *error)
{
HANDLE_FUNCTION_ENTER ();
MONO_HANDLE_DCL (MonoObject, wrapped_exception);
MonoExceptionHandle ret = mono_get_exception_runtime_wrapped_handle (wrapped_exception, error);
HANDLE_FUNCTION_RETURN_OBJ (ret);
}
/**
* mono_handle_exception_internal:
* \param ctx saved processor state
* \param obj the exception object
* \param resume whenever to resume unwinding based on the state in \c MonoJitTlsData.
*/
static gboolean
mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
{
ERROR_DECL (error);
MonoDomain *domain = mono_domain_get ();
MonoJitInfo *ji, *prev_ji;
static int (*call_filter) (MonoContext *, gpointer) = NULL;
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
MonoLMF *lmf = mono_get_lmf ();
MonoException *mono_ex;
gboolean stack_overflow = FALSE;
MonoContext initial_ctx;
MonoMethod *method;
int frame_count = 0;
gint32 filter_idx, first_filter_idx = 0;
int i;
MonoObject *ex_obj = NULL;
MonoObject *non_exception = NULL;
Unwinder unwinder;
gboolean in_interp;
g_assert (ctx != NULL);
if (!obj) {
MonoException *ex = mono_get_exception_null_reference ();
MonoString *msg = mono_string_new_checked (domain, "Object reference not set to an instance of an object", error);
mono_error_assert_ok (error);
MONO_OBJECT_SETREF (ex, message, msg);
obj = (MonoObject *)ex;
}
/*
* Allocate a new exception object instead of the preconstructed ones.
*/
if (obj == (MonoObject *)domain->stack_overflow_ex) {
/*
* It is not a good idea to try and put even more pressure on the little stack available.
* obj = mono_get_exception_stack_overflow ();
*/
stack_overflow = TRUE;
}
else if (obj == (MonoObject *)domain->null_reference_ex) {
obj = (MonoObject *)mono_get_exception_null_reference ();
}
if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, error)) {
mono_error_assert_ok (error);
non_exception = obj;
obj = (MonoObject *)mono_get_exception_runtime_wrapped_checked (obj, error);
mono_error_assert_ok (error);
}
mono_ex = (MonoException*)obj;
if (mini_get_debug_options ()->suspend_on_exception) {
mono_runtime_printf_err ("Exception thrown, suspending...");
while (1)
;
}
if (mono_object_isinst_checked (obj, mono_defaults.exception_class, error)) {
mono_ex = (MonoException*)obj;
} else {
mono_error_assert_ok (error);
mono_ex = NULL;
}
if (mono_ex && jit_tls->class_cast_from) {
if (!strcmp (m_class_get_name (mono_ex->object.vtable->klass), "InvalidCastException")) {
char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
mono_ex->message = mono_string_new_checked (domain, msg, error);
g_free (from_name);
g_free (to_name);
if (!is_ok (error)) {
mono_runtime_printf_err ("Error creating class cast exception message '%s'\n", msg);
mono_error_assert_ok (error);
}
g_free (msg);
}
if (!strcmp (m_class_get_name (mono_ex->object.vtable->klass), "ArrayTypeMismatchException")) {
char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
mono_ex->message = mono_string_new_checked (domain, msg, error);
g_free (from_name);
g_free (to_name);
if (!is_ok (error)) {
mono_runtime_printf_err ("Error creating array type mismatch exception message '%s'\n", msg);
mono_error_assert_ok (error);
}
g_free (msg);
}
}
if (!call_filter)
call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
g_assert (jit_tls->end_of_stack);
g_assert (jit_tls->abort_func);
/*
* We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
* end up being TRUE on any code path.
*/
memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
if (!resume) {
MonoContext ctx_cp = *ctx;
if (mono_trace_is_enabled ()) {
ERROR_DECL (error);
MonoMethod *system_exception_get_message = mono_class_get_method_from_name_checked (mono_defaults.exception_class, "get_Message", 0, 0, error);
mono_error_cleanup (error);
error_init (error);
MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
MonoObject *message;
const char *type_name = m_class_get_name (mono_object_class (mono_ex));
char *msg = NULL;
if (get_message == NULL) {
message = NULL;
} else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
message = NULL;
msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
} else {
MonoObject *exc = NULL;
message = mono_runtime_try_invoke (get_message, obj, NULL, &exc, error);
g_assert (exc == NULL);
mono_error_assert_ok (error);
}
if (msg == NULL) {
if (message) {
msg = mono_string_to_utf8_checked ((MonoString *) message, error);
if (!is_ok (error)) {
mono_error_cleanup (error);
msg = g_strdup ("(error while display System.Exception.Message property)");
}
} else {
msg = g_strdup ("(System.Exception.Message property not available)");
}
}
g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)mono_native_thread_id_get (), m_class_get_name_space (mono_object_class (obj)), m_class_get_name (mono_object_class (obj)), msg);
g_free (msg);
if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
mono_print_thread_dump_from_ctx (ctx);
}
jit_tls->orig_ex_ctx_set = TRUE;
MONO_PROFILER_RAISE (exception_throw, (obj));
jit_tls->orig_ex_ctx_set = FALSE;
StackFrameInfo catch_frame;
MonoFirstPassResult res;
res = handle_exception_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception, &catch_frame);
if (res == MONO_FIRST_PASS_UNHANDLED) {
if (mini_get_debug_options ()->break_on_exc)
G_BREAKPOINT ();
mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, NULL, NULL);
if (mini_get_debug_options ()->suspend_on_unhandled) {
mono_runtime_printf_err ("Unhandled exception, suspending...");
while (1)
;
}
// FIXME: This runs managed code so it might cause another stack overflow when
// we are handling a stack overflow
mini_set_abort_threshold (&catch_frame);
mono_unhandled_exception (obj);
} else {
gboolean unhandled = FALSE;
/*
* The exceptions caught by the mono_runtime_invoke_checked () calls
* in the threadpool needs to be treated as unhandled (#669836).
*
* FIXME: The check below is hackish, but its hard to distinguish
* these runtime invoke calls from others in the runtime.
*/
if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
unhandled = TRUE;
}
if (unhandled)
mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, NULL, NULL);
else if (res != MONO_FIRST_PASS_CALLBACK_TO_NATIVE)
mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, &ctx_cp, &catch_frame);
}
}
if (out_ji)
*out_ji = NULL;
filter_idx = 0;
initial_ctx = *ctx;
unwinder_init (&unwinder);
while (1) {
MonoContext new_ctx;
guint32 free_stack;
int clause_index_start = 0;
gboolean unwind_res = TRUE;
StackFrameInfo frame;
gpointer ip;
if (resume) {
resume = FALSE;
ji = jit_tls->resume_state.ji;
new_ctx = jit_tls->resume_state.new_ctx;
clause_index_start = jit_tls->resume_state.clause_index;
lmf = jit_tls->resume_state.lmf;
first_filter_idx = jit_tls->resume_state.first_filter_idx;
filter_idx = jit_tls->resume_state.filter_idx;
in_interp = FALSE;
} else {
unwind_res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
if (!unwind_res) {
*(mono_get_lmf_addr ()) = lmf;
jit_tls->abort_func (obj);
g_assert_not_reached ();
}
switch (frame.type) {
case FRAME_TYPE_DEBUGGER_INVOKE:
case FRAME_TYPE_MANAGED_TO_NATIVE:
case FRAME_TYPE_TRAMPOLINE:
case FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX:
*ctx = new_ctx;
continue;
case FRAME_TYPE_INTERP_TO_MANAGED:
continue;
case FRAME_TYPE_INTERP:
case FRAME_TYPE_MANAGED:
break;
default:
g_assert_not_reached ();
break;
}
in_interp = frame.type == FRAME_TYPE_INTERP;
ji = frame.ji;
}
if (in_interp)
ip = (guint8*)ji->code_start + frame.native_offset;
else
ip = MONO_CONTEXT_GET_IP (ctx);
method = jinfo_get_method (ji);
frame_count ++;
//printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
if (stack_overflow) {
free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
} else {
free_stack = 0xffffff;
}
if (method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED && ftnptr_eh_callback) {
guint32 handle = mono_gchandle_new (obj, FALSE);
MONO_STACKDATA (stackptr);
mono_threads_enter_gc_safe_region_unbalanced_internal (&stackptr);
mono_set_lmf (lmf);
ftnptr_eh_callback (handle);
g_error ("Did not expect ftnptr_eh_callback to return.");
}
for (i = clause_index_start; i < ji->num_clauses; i++) {
MonoJitExceptionInfo *ei = &ji->clauses [i];
gboolean filtered = FALSE;
/*
* During stack overflow, wait till the unwinding frees some stack
* space before running handlers/finalizers.
*/
if (free_stack <= (64 * 1024))
continue;
if (is_address_protected (ji, ei, ip)) {
/* catch block */
MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
/*
* Have to unwrap RuntimeWrappedExceptions if the
* method's assembly doesn't have a RuntimeCompatibilityAttribute.
*/
if (non_exception && !wrap_non_exception_throws (method))
ex_obj = non_exception;
else
ex_obj = obj;
if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
#ifndef MONO_CROSS_COMPILE
#ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
#else
g_assert (!ji->from_llvm);
/* store the exception object in bp + ei->exvar_offset */
*((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
#endif
#endif
}
#ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
if (ji->from_llvm)
MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
#endif
if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
/*
* Filter clauses should only be run in the
* first pass of exception handling.
*/
filtered = (filter_idx == first_filter_idx);
filter_idx ++;
}
error_init (error);
if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
mono_object_isinst_checked (ex_obj, catch_class, error)) || filtered) {
/*
* This guards against the situation that we abort a thread that is executing a finally clause
* that was called by the EH machinery. It won't have a guard trampoline installed, so we must
* check for this situation here and resume interruption if we are below the guarded block.
*/
if (G_UNLIKELY (jit_tls->handler_block)) {
gboolean is_outside = FALSE;
gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
//FIXME make this stack direction aware
if (catch_bp > prot_bp) {
is_outside = TRUE;
} else if (catch_bp == prot_bp) {
/* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
* So we check if the catch handler_start is protected by the guarded handler protected region
*
* Assumptions:
* If there is an outstanding guarded_block return address, it means the current thread must be aborted.
* This is the only way to reach out the guarded block as other cases are handled by the trampoline.
* There aren't any further finally/fault handler blocks down the stack over this exception.
* This must be ensured by the code that installs the guard trampoline.
*/
g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
is_outside = TRUE;
}
}
if (is_outside) {
jit_tls->handler_block = NULL;
mono_thread_resume_interruption (TRUE); /*We ignore the exception here, it will be raised later*/
}
}
if (mono_trace_is_enabled () && mono_trace_eval (method))
g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
/*
* At this point, ei->flags can be either MONO_EXCEPTION_CLAUSE_NONE for a
* a try-catch clause or MONO_EXCEPTION_CLAUSE_FILTER for a try-filter-catch
* clause. Since we specifically want to indicate that we're executing the
* catch portion of this EH clause, pass MONO_EXCEPTION_CLAUSE_NONE explicitly
* instead of ei->flags.
*/
if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
jit_tls->orig_ex_ctx_set = TRUE;
MONO_PROFILER_RAISE (exception_clause, (method, i, MONO_EXCEPTION_CLAUSE_NONE, ex_obj));
jit_tls->orig_ex_ctx_set = FALSE;
}
mini_set_abort_threshold (&frame);
if (in_interp) {
interp_exit_finally_abort_blocks (ji, clause_index_start, i, ip);
/*
* ctx->pc points into the interpreter, after the call which transitioned to
* JITted code. Store the unwind state into the
* interpeter state, then resume, the interpreter will unwind itself until
* it reaches the target frame and will continue execution from there.
* The resuming is kinda hackish, from the native code standpoint, it looks
* like the call which transitioned to JITted code has succeeded, but the
* return value register etc. is not set, so we have to be careful.
*/
mini_get_interp_callbacks ()->set_resume_state (jit_tls, mono_ex, ei, frame.interp_frame, ei->handler_start);
/* Undo the IP adjustment done by mono_arch_unwind_frame () */
/* ip == 0 means an interpreter frame */
if (MONO_CONTEXT_GET_IP (ctx) != 0)
mono_arch_undo_ip_adjustment (ctx);
} else {
MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
}
mono_set_lmf (lmf);
#ifndef DISABLE_PERFCOUNTERS
mono_atomic_fetch_add_i32 (&mono_perfcounters->exceptions_depth, frame_count);
#endif
if (obj == (MonoObject *)domain->stack_overflow_ex)
jit_tls->handling_stack_ovf = FALSE;
return 0;
}
mono_error_cleanup (error);
if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
if (mono_trace_is_enabled () && mono_trace_eval (method))
g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
jit_tls->orig_ex_ctx_set = TRUE;
MONO_PROFILER_RAISE (exception_clause, (method, i, (MonoExceptionEnum)ei->flags, ex_obj));
jit_tls->orig_ex_ctx_set = FALSE;
}
}
if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
if (mono_trace_is_enabled () && mono_trace_eval (method))
g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
jit_tls->orig_ex_ctx_set = TRUE;
MONO_PROFILER_RAISE (exception_clause, (method, i, (MonoExceptionEnum)ei->flags, ex_obj));
jit_tls->orig_ex_ctx_set = FALSE;
}
#ifndef DISABLE_PERFCOUNTERS
mono_atomic_inc_i32 (&mono_perfcounters->exceptions_finallys);
#endif
}
if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT || ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
mono_set_lmf (lmf);
if (ji->from_llvm) {
/*
* LLVM compiled finally handlers follow the design
* of the c++ ehabi, i.e. they call a resume function
* at the end instead of returning to the caller.
* So save the exception handling state,
* mono_resume_unwind () will call us again to continue
* the unwinding.
*/
jit_tls->resume_state.ex_obj = obj;
jit_tls->resume_state.ji = ji;
jit_tls->resume_state.clause_index = i + 1;
jit_tls->resume_state.ctx = *ctx;
jit_tls->resume_state.new_ctx = new_ctx;
jit_tls->resume_state.lmf = lmf;
jit_tls->resume_state.first_filter_idx = first_filter_idx;
jit_tls->resume_state.filter_idx = filter_idx;
mini_set_abort_threshold (&frame);
MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
return 0;
} else {
mini_set_abort_threshold (&frame);
if (in_interp) {
gboolean has_ex = mini_get_interp_callbacks ()->run_finally (&frame, i, ei->handler_start);
if (has_ex)
return 0;
} else {
call_filter (ctx, ei->handler_start);
}
}
}
}
}
if (in_interp)
interp_exit_finally_abort_blocks (ji, clause_index_start, ji->num_clauses, ip);
if (MONO_PROFILER_ENABLED (method_exception_leave) &&
mono_profiler_get_call_instrumentation_flags (method) & MONO_PROFILER_CALL_INSTRUMENTATION_EXCEPTION_LEAVE) {
jit_tls->orig_ex_ctx_set = TRUE;
MONO_PROFILER_RAISE (method_exception_leave, (method, ex_obj));
jit_tls->orig_ex_ctx_set = FALSE;
}
*ctx = new_ctx;
}
g_assert_not_reached ();
}
/**
* mono_debugger_run_finally:
* \param start_ctx saved processor state
* This method is called by the Mono Debugger to call all \c finally clauses of the
* current stack frame. It's used when the user issues a \c return command to make
* the current stack frame return. After returning from this method, the debugger
* unwinds the stack one frame and gives control back to the user.
* NOTE: This method is only used when running inside the Mono Debugger.
*/
void
mono_debugger_run_finally (MonoContext *start_ctx)
{
static int (*call_filter) (MonoContext *, gpointer) = NULL;
MonoDomain *domain = mono_domain_get ();
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
MonoLMF *lmf = mono_get_lmf ();
MonoContext ctx, new_ctx;
MonoJitInfo *ji, rji;
int i;
ctx = *start_ctx;
ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
if (!ji || ji == (gpointer)-1)
return;
if (!call_filter)
call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
for (i = 0; i < ji->num_clauses; i++) {
MonoJitExceptionInfo *ei = &ji->clauses [i];
if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
(ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
call_filter (&ctx, ei->handler_start);
}
}
}
/**
* mono_handle_exception:
* \param ctx saved processor state
* \param obj the exception object
*
* Handle the exception OBJ starting from the state CTX. Modify CTX to point to the handler clause if the exception is caught, and
* return TRUE.
*/
gboolean
mono_handle_exception (MonoContext *ctx, gpointer void_obj)
{
MonoObject *obj = (MonoObject*)void_obj;
MONO_REQ_GC_UNSAFE_MODE;
#ifndef DISABLE_PERFCOUNTERS
mono_atomic_inc_i32 (&mono_perfcounters->exceptions_thrown);
#endif
return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
}
#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
#ifndef MONO_ARCH_USE_SIGACTION
#error "Can't use sigaltstack without sigaction"
#endif
void
mono_setup_altstack (MonoJitTlsData *tls)
{
size_t stsize = 0;
stack_t sa;
guint8 *staddr = NULL;
#ifdef TARGET_OSX
/*
* On macOS Mojave we are encountering a bug when changing mapping for main thread
* stack pages. Stack overflow on main thread will kill the app.
*/
gboolean disable_stack_guard = mono_threads_platform_is_main_thread ();
#else
gboolean disable_stack_guard = FALSE;
#endif
if (mono_running_on_valgrind ())
return;
mono_thread_info_get_stack_bounds (&staddr, &stsize);
g_assert (staddr);
tls->end_of_stack = staddr + stsize;
tls->stack_size = stsize;
/*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
if (!disable_stack_guard) {
tls->stack_ovf_guard_base = staddr + mono_pagesize ();
tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
/* mprotect can fail for the main thread stack */
gpointer gaddr = mono_valloc (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON|MONO_MMAP_FIXED, MONO_MEM_ACCOUNT_EXCEPTIONS);
g_assert (gaddr == tls->stack_ovf_guard_base);
tls->stack_ovf_valloced = TRUE;
}
}
/* Setup an alternate signal stack */
tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON, MONO_MEM_ACCOUNT_EXCEPTIONS);
tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
g_assert (tls->signal_stack);
sa.ss_sp = tls->signal_stack;
sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
sa.ss_flags = 0;
g_assert (sigaltstack (&sa, NULL) == 0);
mono_gc_register_altstack ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size, (char*)staddr + stsize - ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size), tls->signal_stack, tls->signal_stack_size);
}
void
mono_free_altstack (MonoJitTlsData *tls)
{
stack_t sa;
int err;
sa.ss_sp = tls->signal_stack;
sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
sa.ss_flags = SS_DISABLE;
err = sigaltstack (&sa, NULL);
g_assert (err == 0);
if (tls->signal_stack)
mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MEM_ACCOUNT_EXCEPTIONS);
if (!tls->stack_ovf_guard_base)
return;
if (tls->stack_ovf_valloced)
mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MEM_ACCOUNT_EXCEPTIONS);
else
mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
}
#else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
void
mono_setup_altstack (MonoJitTlsData *tls)
{
}
void
mono_free_altstack (MonoJitTlsData *tls)
{
}
#endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
gboolean
mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
{
if (mono_llvm_only)
return FALSE;
/* we got a stack overflow in the soft-guard pages
* There are two cases:
* 1) managed code caused the overflow: we unprotect the soft-guard page
* and let the arch-specific code trigger the exception handling mechanism
* in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
* 2) unmanaged code caused the overflow: we unprotect the soft-guard page
* and hope we can continue with those enabled, at least until the hard-guard page
* is hit. The alternative to continuing here is to just print a message and abort.
* We may add in the future the code to protect the pages again in the codepath
* when we return from unmanaged to managed code.
*/
if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
gboolean handled = FALSE;
mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
if (ji) {
mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
handled = TRUE;
}
#endif
if (!handled) {
/* We print a message: after this even managed stack overflows
* may crash the runtime
*/
mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
if (!jit_tls->handling_stack_ovf) {
jit_tls->handling_stack_ovf = 1;
} else {
/*fprintf (stderr, "Already handling stack overflow\n");*/
}
}
return TRUE;
}
return FALSE;
}
typedef struct {
MonoMethod *omethod;
int count;
} PrintOverflowUserData;
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
static gboolean
print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
MonoMethod *method = NULL;
PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
gchar *location;
if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
method = jinfo_get_method (frame->ji);
if (method) {
if (user_data->count == 0) {
/* The first frame is in its prolog, so a line number cannot be computed */
user_data->count ++;
return FALSE;
}
/* If this is a one method overflow, skip the other instances */
if (method == user_data->omethod)
return FALSE;
location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
mono_runtime_printf_err (" %s", location);
g_free (location);
if (user_data->count == 1) {
mono_runtime_printf_err (" <...>");
user_data->omethod = method;
} else {
user_data->omethod = NULL;
}
user_data->count ++;
} else
mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
return FALSE;
}
#endif
void
mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
{
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
PrintOverflowUserData ud;
MonoContext mctx;
#endif
/* we don't do much now, but we can warn the user with a useful message */
mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
mono_sigctx_to_monoctx (ctx, &mctx);
mono_runtime_printf_err ("Stacktrace:");
memset (&ud, 0, sizeof (ud));
mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
#else
if (ji && !ji->is_trampoline && jinfo_get_method (ji))
mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
else
mono_runtime_printf_err ("At <unmanaged>.");
#endif
_exit (1);
}
static gboolean
print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
MonoMethod *method = NULL;
if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
method = jinfo_get_method (frame->ji);
if (method) {
gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
mono_runtime_printf_err (" %s", location);
g_free (location);
} else
mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
return FALSE;
}
static G_GNUC_UNUSED gboolean
print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
GString *p = (GString*)data;
MonoMethod *method = NULL;
if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
method = jinfo_get_method (frame->ji);
if (method && frame->domain) {
gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
g_string_append_printf (p, " %s\n", location);
g_free (location);
} else
g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
return FALSE;
}
#ifndef MONO_CROSS_COMPILE
static gboolean handle_crash_loop = FALSE;
/*
* mono_handle_native_crash:
*
* Handle a native crash (e.g. SIGSEGV) while in native code by
* printing diagnostic information and aborting.
*/
void
mono_handle_native_crash (const char *signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
{
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
if (handle_crash_loop)
return;
if (mini_get_debug_options ()->suspend_on_native_crash) {
mono_runtime_printf_err ("Received %s, suspending...", signal);
while (1) {
// Sleep for 1 second.
g_usleep (1000 * 1000);
}
}
/* prevent infinite loops in crash handling */
handle_crash_loop = TRUE;
/* !jit_tls means the thread was not registered with the runtime */
if (jit_tls && mono_thread_internal_current ()) {
mono_runtime_printf_err ("Stacktrace:\n");
/* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
}
mono_dump_native_crash_info (signal, ctx, info);
/*
* A SIGSEGV indicates something went very wrong so we can no longer depend
* on anything working. So try to print out lots of diagnostics, starting
* with ones which have a greater chance of working.
*/
mono_runtime_printf_err (
"\n"
"=================================================================\n"
"Got a %s while executing native code. This usually indicates\n"
"a fatal error in the mono runtime or one of the native libraries \n"
"used by your application.\n"
"=================================================================\n",
signal);
#ifdef MONO_ARCH_USE_SIGACTION
struct sigaction sa;
sa.sa_handler = SIG_DFL;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
/* Remove our SIGABRT handler */
g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
/* On some systems we get a SIGILL when calling abort (), because it might
* fail to raise SIGABRT */
g_assert (sigaction (SIGILL, &sa, NULL) != -1);
#endif
mono_post_native_crash_handler (signal, ctx, info, mono_do_crash_chaining);
}
#else
void
mono_handle_native_crash (const char *signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
{
g_assert_not_reached ();
}
#endif /* !MONO_CROSS_COMPILE */
static void
mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
{
MonoInternalThread *thread = mono_thread_internal_current ();
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
MonoContext ctx;
#endif
GString* text;
char *name;
GError *gerror = NULL;
if (!thread)
return;
text = g_string_new (0);
if (thread->name) {
name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &gerror);
g_assert (!gerror);
g_string_append_printf (text, "\n\"%s\"", name);
g_free (name);
}
else if (thread->threadpool_thread)
g_string_append (text, "\n\"<threadpool thread>\"");
else
g_string_append (text, "\n\"<unnamed thread>\"");
g_string_append_printf (text, " tid=%p this=%p ", (gpointer)(gsize)thread->tid, thread);
mono_thread_internal_describe (thread, text);
g_string_append (text, "\n");
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
if (start_ctx) {
memcpy (&ctx, start_ctx, sizeof (MonoContext));
} else if (!sigctx)
MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
else
mono_sigctx_to_monoctx (sigctx, &ctx);
mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
#else
mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
#endif
mono_runtime_printf ("%s", text->str);
#if HOST_WIN32 && TARGET_WIN32 && _DEBUG
OutputDebugStringA(text->str);
#endif
g_string_free (text, TRUE);
mono_runtime_stdout_fflush ();
}
/**
* mono_print_thread_dump:
*
* Print information about the current thread to stdout.
* \p sigctx can be NULL, allowing this to be called from gdb.
*/
void
mono_print_thread_dump (void *sigctx)
{
mono_print_thread_dump_internal (sigctx, NULL);
}
void
mono_print_thread_dump_from_ctx (MonoContext *ctx)
{
mono_print_thread_dump_internal (NULL, ctx);
}
/*
* mono_resume_unwind:
*
* This is called by a trampoline from LLVM compiled finally clauses to continue
* unwinding.
*/
void
mono_resume_unwind (MonoContext *ctx)
{
MONO_REQ_GC_UNSAFE_MODE;
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
MonoContext new_ctx;
MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
new_ctx = *ctx;
mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
mono_restore_context (&new_ctx);
}
typedef struct {
MonoJitInfo *ji;
MonoContext ctx;
MonoJitExceptionInfo *ei;
} FindHandlerBlockData;
static gboolean
find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
int i;
gpointer ip;
FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
MonoJitInfo *ji = frame->ji;
if (!ji)
return FALSE;
ip = MONO_CONTEXT_GET_IP (ctx);
for (i = 0; i < ji->num_clauses; ++i) {
MonoJitExceptionInfo *ei = ji->clauses + i;
if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
continue;
/*If ip points to the first instruction it means the handler block didn't start
so we can leave its execution to the EH machinery*/
if (ei->handler_start <= ip && ip < ei->data.handler_end) {
pdata->ji = ji;
pdata->ei = ei;
pdata->ctx = *ctx;
break;
}
}
return FALSE;
}
static void
install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
{
int i;
MonoJitExceptionInfo *clause = NULL;
gpointer ip;
guint8 *bp;
ip = MONO_CONTEXT_GET_IP (ctx);
for (i = 0; i < ji->num_clauses; ++i) {
clause = &ji->clauses [i];
if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
continue;
if (clause->handler_start <= ip && clause->data.handler_end > ip)
break;
}
/*no matching finally - can't happen, we parallel the logic in find_last_handler_block. */
g_assert (i < ji->num_clauses);
/*Load the spvar*/
bp = (guint8*)MONO_CONTEXT_GET_BP (ctx);
*(bp + clause->exvar_offset) = 1;
}
/*
* Finds the bottom handler block running and install a block guard if needed.
*/
static gboolean
mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
{
FindHandlerBlockData data = { 0 };
MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
/* Guard against a null MonoJitTlsData. This can happens if the thread receives the
* interrupt signal before the JIT has time to initialize its TLS data for the given thread.
*/
if (!jit_tls || jit_tls->handler_block)
return FALSE;
/* Do an async safe stack walk */
mono_thread_info_set_is_async_context (TRUE);
mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
mono_thread_info_set_is_async_context (FALSE);
if (!data.ji)
return FALSE;
memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
install_handler_block_guard (data.ji, &data.ctx);
jit_tls->handler_block = data.ei;
return TRUE;
}
static void
mono_uninstall_current_handler_block_guard (void)
{
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
if (jit_tls)
jit_tls->handler_block = NULL;
}
static gboolean
mono_current_thread_has_handle_block_guard (void)
{
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
return jit_tls && jit_tls->handler_block != NULL;
}
void
mono_set_cast_details (MonoClass *from, MonoClass *to)
{
MonoJitTlsData *jit_tls = NULL;
if (mini_get_debug_options ()->better_cast_details) {
jit_tls = mono_tls_get_jit_tls ();
jit_tls->class_cast_from = from;
jit_tls->class_cast_to = to;
}
}
/*returns false if the thread is not attached*/
gboolean
mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
{
#ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
if (!thread) {
ctx->valid = FALSE;
return FALSE;
}
if (sigctx) {
mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
}
else {
mono_thread_state_init (ctx);
}
if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
return FALSE;
ctx->valid = TRUE;
return TRUE;
#else
g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
return FALSE;
#endif
}
void
mono_thread_state_init (MonoThreadUnwindState *ctx)
{
MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
#if defined(MONO_CROSS_COMPILE)
ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
#elif MONO_ARCH_HAS_MONO_CONTEXT
MONO_CONTEXT_GET_CURRENT (ctx->ctx);
#else
g_error ("Use a null sigctx requires a working mono-context");
#endif
ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
ctx->valid = TRUE;
}
gboolean
mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
{
MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
if (!thread) {
ctx->valid = FALSE;
return FALSE;
}
ctx->ctx = *mctx;
ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
ctx->valid = TRUE;
return TRUE;
}
/*returns false if the thread is not attached*/
gboolean
mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
{
MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
MONO_ARCH_CONTEXT_DEF
mono_arch_flush_register_windows ();
if (!thread || !thread->jit_data) {
ctx->valid = FALSE;
return FALSE;
}
MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
ctx->valid = TRUE;
return TRUE;
}
static void
mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
{
mono_handle_exception (ctx, (MonoObject *)exc);
mono_restore_context (ctx);
}
/*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
void
mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
{
#ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
jit_tls->ex_ctx = *ctx;
mono_arch_setup_async_callback (ctx, async_cb, user_data);
#else
g_error ("This target doesn't support mono_arch_setup_async_callback");
#endif
}
/*
* mono_restore_context:
*
* Call the architecture specific restore context function.
*/
void
mono_restore_context (MonoContext *ctx)
{
static void (*restore_context) (MonoContext *);
if (!restore_context)
restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
restore_context (ctx);
g_assert_not_reached ();
}
/*
* mono_jinfo_get_unwind_info:
*
* Return the unwind info for JI.
*/
guint8*
mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
{
if (ji->has_unwind_info) {
/* The address/length in the MonoJitInfo structure itself */
MonoUnwindJitInfo *info = mono_jit_info_get_unwind_info (ji);
*unwind_info_len = info->unw_info_len;
return info->unw_info;
} else if (ji->from_aot)
return mono_aot_get_unwind_info (ji, unwind_info_len);
else
return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
}
int
mono_jinfo_get_epilog_size (MonoJitInfo *ji)
{
MonoArchEHJitInfo *info;
info = mono_jit_info_get_arch_eh_info (ji);
g_assert (info);
return info->epilog_size;
}
/*
* mono_install_ftnptr_eh_callback:
*
* Install a callback that should be called when there is a managed exception
* in a native-to-managed wrapper. This is mainly used by iOS to convert a
* managed exception to a native exception, to properly unwind the native
* stack; this native exception will then be converted back to a managed
* exception in their managed-to-native wrapper.
*/
void
mono_install_ftnptr_eh_callback (MonoFtnPtrEHCallback callback)
{
ftnptr_eh_callback = callback;
}
/*
* LLVM/Bitcode exception handling.
*/
static void
throw_exception (MonoObject *ex, gboolean rethrow)
{
MONO_REQ_GC_UNSAFE_MODE;
ERROR_DECL (error);
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
MonoException *mono_ex;
if (!mono_object_isinst_checked (ex, mono_defaults.exception_class, error)) {
mono_error_assert_ok (error);
mono_ex = mono_get_exception_runtime_wrapped_checked (ex, error);
mono_error_assert_ok (error);
jit_tls->thrown_non_exc = mono_gchandle_new (ex, FALSE);
}
else
mono_ex = (MonoException*)ex;
// Note: Not pinned
jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
if (!rethrow) {
#ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
GList *l, *ips = NULL;
GList *trace;
_Unwind_Backtrace (build_stack_trace, &ips);
/* The list contains ip-gshared info pairs */
trace = NULL;
ips = g_list_reverse (ips);
for (l = ips; l; l = l->next) {
trace = g_list_append (trace, l->data);
trace = g_list_append (trace, NULL);
trace = g_list_append (trace, NULL);
}
MonoArray *ips_arr = mono_glist_to_array (trace, mono_defaults.int_class, error);
mono_error_assert_ok (error);
MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
g_list_free (l);
g_list_free (trace);
#endif
}
mono_llvm_cpp_throw_exception ();
}
void
mono_llvm_throw_exception (MonoObject *ex)
{
throw_exception (ex, FALSE);
}
void
mono_llvm_rethrow_exception (MonoObject *ex)
{
throw_exception (ex, TRUE);
}
void
mono_llvm_raise_exception (MonoException *e)
{
mono_llvm_throw_exception ((MonoObject*)e);
}
void
mono_llvm_reraise_exception (MonoException *e)
{
mono_llvm_rethrow_exception ((MonoObject*)e);
}
void
mono_llvm_throw_corlib_exception (guint32 ex_token_index)
{
guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
MonoException *ex;
ex = mono_exception_from_token (m_class_get_image (mono_defaults.exception_class), ex_token);
mono_llvm_throw_exception ((MonoObject*)ex);
}
/*
* mono_llvm_resume_exception:
*
* Resume exception propagation.
*/
void
mono_llvm_resume_exception (void)
{
mono_llvm_cpp_throw_exception ();
}
/*
* mono_llvm_load_exception:
*
* Return the currently thrown exception.
*/
MonoObject *
mono_llvm_load_exception (void)
{
ERROR_DECL (error);
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
if (mono_ex->trace_ips) {
GList *trace_ips = NULL;
gpointer ip = MONO_RETURN_ADDRESS ();
size_t upper = mono_array_length (mono_ex->trace_ips);
for (int i = 0; i < upper; i += TRACE_IP_ENTRY_SIZE) {
gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
for (int j = 0; j < TRACE_IP_ENTRY_SIZE; ++j) {
gpointer p = mono_array_get (mono_ex->trace_ips, gpointer, i + j);
trace_ips = g_list_append (trace_ips, p);
}
if (ip == curr_ip)
break;
}
// FIXME: Does this work correctly for rethrows?
// We may be discarding useful information
// when this gets GC'ed
MonoArray *ips_arr = mono_glist_to_array (trace_ips, mono_defaults.int_class, error);
mono_error_assert_ok (error);
MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
g_list_free (trace_ips);
// FIXME:
//MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
} else {
MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, 0, error));
mono_error_assert_ok (error);
MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new_checked (mono_domain_get (), mono_defaults.stack_frame_class, 0, error));
mono_error_assert_ok (error);
}
return &mono_ex->object;
}
/*
* mono_llvm_clear_exception:
*
* Mark the currently thrown exception as handled.
*/
void
mono_llvm_clear_exception (void)
{
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
mono_gchandle_free (jit_tls->thrown_exc);
jit_tls->thrown_exc = 0;
if (jit_tls->thrown_non_exc)
mono_gchandle_free (jit_tls->thrown_non_exc);
jit_tls->thrown_non_exc = 0;
mono_memory_barrier ();
}
/*
* mono_llvm_match_exception:
*
* Return the innermost clause containing REGION_START-REGION_END which can handle
* the current exception.
*/
gint32
mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
{
ERROR_DECL (error);
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
MonoObject *exc;
gint32 index = -1;
g_assert (jit_tls->thrown_exc);
exc = mono_gchandle_get_target (jit_tls->thrown_exc);
if (jit_tls->thrown_non_exc) {
/*
* Have to unwrap RuntimeWrappedExceptions if the
* method's assembly doesn't have a RuntimeCompatibilityAttribute.
*/
if (!wrap_non_exception_throws (jinfo_get_method (jinfo)))
exc = mono_gchandle_get_target (jit_tls->thrown_non_exc);
}
for (int i = 0; i < jinfo->num_clauses; i++) {
MonoJitExceptionInfo *ei = &jinfo->clauses [i];
MonoClass *catch_class;
if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
continue;
catch_class = ei->data.catch_class;
if (mono_class_is_open_constructed_type (m_class_get_byval_arg (catch_class))) {
MonoGenericContext context;
MonoType *inflated_type;
g_assert (rgctx || this_obj);
context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
inflated_type = mono_class_inflate_generic_type_checked (m_class_get_byval_arg (catch_class), &context, error);
mono_error_assert_ok (error); /* FIXME don't swallow the error */
catch_class = mono_class_from_mono_type (inflated_type);
mono_metadata_free_type (inflated_type);
}
// FIXME: Handle edge cases handled in get_exception_catch_class
if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (exc, catch_class, error)) {
index = ei->clause_index;
break;
} else
mono_error_assert_ok (error);
if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
g_assert_not_reached ();
}
}
return index;
}
#if defined(ENABLE_LLVM) && defined(HAVE_UNWIND_H)
G_EXTERN_C _Unwind_Reason_Code mono_debug_personality (int a, _Unwind_Action b,
uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
{
g_assert_not_reached ();
}
#else
G_EXTERN_C void mono_debug_personality (void);
void
mono_debug_personality (void)
{
g_assert_not_reached ();
}
#endif
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