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mini-exceptions.c
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mini-exceptions.c
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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>
#include <signal.h>
#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/handle.h>
#include <mono/metadata/icall-decl.h>
#include <mono/metadata/tokentype.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-threads-debug.h>
#include <mono/utils/w32subset.h>
#include <mono/metadata/components.h>
#include "mini.h"
#include "trace.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
#include "mono/utils/mono-tls-inline.h"
/*
* 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, 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 throw_exception (MonoObject *ex, gboolean rethrow);
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 void
mini_clear_abort_threshold (void)
{
MonoJitTlsData *jit_tls = mono_get_jit_tls ();
jit_tls->abort_exc_stack_threshold = NULL;
}
static 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 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 (MonoMethod *method, gint32 native_offset)
{
SeqPoint sp;
if (mono_find_prev_seq_point_for_native_offset (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 if (!mono_llvm_only) {
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;
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;
}
static void
no_call_filter (void)
{
g_assert_not_reached ();
}
gpointer
mono_get_call_filter (void)
{
/* This is called even in llvmonly mode etc. */
if (!call_filter_func)
return (gpointer)no_call_filter;
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;
ip = MINI_FTNPTR_TO_ADDR (ip);
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)
{
uintptr_t ip = _Unwind_GetIP (frame_ctx);
if (show_native_addresses || mono_jit_info_table_find_internal ((char*)ip, TRUE, FALSE)) {
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 (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 if (ext->kind == MONO_LMFEXT_JIT_ENTRY) {
frame->type = FRAME_TYPE_JIT_ENTRY;
} else {
g_assert_not_reached ();
}
*lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~3);
return TRUE;
}
}
return mono_arch_unwind_frame (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 (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 (ip);
if (managed)
*managed = FALSE;
err = arch_unwind_frame (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 (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 (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 (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;
real_ip = (const char*)MINI_FTNPTR_TO_ADDR (real_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, NULL);
} 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 (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;
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 (ip, TRUE);
if (save_locations)
memset (save_locations, 0, MONO_MAX_IREGS * sizeof (host_mgreg_t*));
err = arch_unwind_frame (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->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, NULL);
} 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,
MonoJitTlsData *jit_tls,
MonoJitInfo *prev_ji, MonoContext *ctx,
MonoContext *new_ctx, char **trace, MonoLMF **lmf,
host_mgreg_t **save_locations,
StackFrameInfo *frame)
{
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) {
const gpointer parent = mini_get_interp_callbacks ()->frame_get_parent (frame->interp_frame);
unwinder->last_frame_addr = parent;
}
if (!unwinder->in_interp)
frame->type = FRAME_TYPE_INTERP_ENTRY;
return TRUE;
} else {
gboolean res = mono_find_jit_info_ext (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.
*/
gpointer
mono_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.
*/
MonoGenericContext
mono_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 || mini_method_is_default_method (method)) {
MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
klass = mrgctx->class_vtable->klass;
context.method_inst = mrgctx->method_inst;
if (!mini_method_is_default_method (method))
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;
if (mini_method_is_default_method (method)) {
if (mono_class_is_ginst (klass) || mono_class_is_gtd (klass))
context.class_inst = mini_class_get_context (klass)->class_inst;
return context;
}
/* 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 = mono_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 (is_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;
}
static gboolean
mono_exception_stackframe_obj_walk (MonoStackFrame *captured_frame, MonoExceptionFrameWalk func, gpointer user_data)
{
if (!captured_frame)
return TRUE;
gpointer ip = (gpointer) (captured_frame->method_address + captured_frame->native_offset);
MonoJitInfo *ji = mono_jit_info_table_find_internal (ip, TRUE, TRUE);
// Other domain maybe?
if (!ji)
return FALSE;
MonoMethod *method = jinfo_get_method (ji);
gboolean r = func (method, (gpointer) captured_frame->method_address, captured_frame->native_offset, TRUE, user_data);
if (r)
return TRUE;
return FALSE;
}
static gboolean
mono_exception_stacktrace_obj_walk (MonoStackTrace *st, MonoExceptionFrameWalk func, gpointer user_data)
{
int num_captured = st->captured_traces ? mono_array_length_internal (st->captured_traces) : 0;
for (int i=0; i < num_captured; i++) {
MonoStackTrace *curr_trace = mono_array_get_fast (st->captured_traces, MonoStackTrace *, i);
mono_exception_stacktrace_obj_walk (curr_trace, func, user_data);
}
int num_frames = st->frames ? mono_array_length_internal (st->frames) : 0;
for (int frame = 0; frame < num_frames; frame++) {
gboolean r = mono_exception_stackframe_obj_walk (mono_array_get_fast (st->frames, MonoStackFrame *, frame), func, user_data);
if (r)
return TRUE;
}
return TRUE;
}
gboolean
mono_exception_walk_trace_internal (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
{
MONO_REQ_GC_UNSAFE_MODE;
MonoArray *ta = ex->trace_ips;
/* Exception is not thrown yet */
if (ta == NULL)
return FALSE;
int len = mono_array_length_internal (ta) / TRACE_IP_ENTRY_SIZE;
gboolean otherwise_has_traces = len > 0;
for (int 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_internal (ip, TRUE, FALSE);
}
if (ji == NULL) {
gboolean r;
MONO_ENTER_GC_SAFE;
r = func (NULL, ip, 0, FALSE, user_data);
MONO_EXIT_GC_SAFE;
if (r)