1 files changed, 132 insertions, 0 deletions
diff --git a/winpr/libwinpr/utils/unwind/debug.c b/winpr/libwinpr/utils/unwind/debug.c
new file mode 100644
index 0000000..1bc8b94
--- /dev/null
+++ b/winpr/libwinpr/utils/unwind/debug.c
@@ -0,0 +1,132 @@
+/**
+ * WinPR: Windows Portable Runtime
+ * WinPR Debugging helpers
+ *
+ * Copyright 2022 Armin Novak <armin.novak@thincast.com>
+ * Copyright 2022 Thincast Technologies GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <assert.h>
+#include <stdlib.h>
+#include <unwind.h>
+
+#include <winpr/string.h>
+#include "debug.h"
+
+#include <dlfcn.h>
+
+typedef struct
+{
+	uintptr_t pc;
+	void* langSpecificData;
+} unwind_info_t;
+
+typedef struct
+{
+	size_t pos;
+	size_t size;
+	unwind_info_t* info;
+} unwind_context_t;
+
+static _Unwind_Reason_Code unwind_backtrace_callback(struct _Unwind_Context* context, void* arg)
+{
+	unwind_context_t* ctx = arg;
+
+	assert(ctx);
+
+	if (ctx->pos < ctx->size)
+	{
+		unwind_info_t* info = &ctx->info[ctx->pos++];
+		info->pc = _Unwind_GetIP(context);
+		info->langSpecificData = (void*)_Unwind_GetLanguageSpecificData(context);
+	}
+
+	return _URC_NO_REASON;
+}
+
+void* winpr_unwind_backtrace(DWORD size)
+{
+	_Unwind_Reason_Code rc = _URC_FOREIGN_EXCEPTION_CAUGHT;
+	unwind_context_t* ctx = calloc(1, sizeof(unwind_context_t));
+	if (!ctx)
+		goto fail;
+	ctx->size = size;
+	ctx->info = calloc(size, sizeof(unwind_info_t));
+	if (!ctx->info)
+		goto fail;
+
+	rc = _Unwind_Backtrace(unwind_backtrace_callback, ctx);
+	if (rc != _URC_END_OF_STACK)
+		goto fail;
+
+	return ctx;
+fail:
+	winpr_unwind_backtrace_free(ctx);
+	return NULL;
+}
+
+void winpr_unwind_backtrace_free(void* buffer)
+{
+	unwind_context_t* ctx = buffer;
+	if (!ctx)
+		return;
+	free(ctx->info);
+	free(ctx);
+}
+
+#define UNWIND_MAX_LINE_SIZE 1024
+
+char** winpr_unwind_backtrace_symbols(void* buffer, size_t* used)
+{
+	union
+	{
+		char* cp;
+		char** cpp;
+	} cnv;
+	unwind_context_t* ctx = buffer;
+	cnv.cpp = NULL;
+
+	if (!ctx)
+		return NULL;
+
+	cnv.cpp = calloc(ctx->pos * (sizeof(char*) + UNWIND_MAX_LINE_SIZE), sizeof(char*));
+	if (!cnv.cpp)
+		return NULL;
+
+	if (used)
+		*used = ctx->pos;
+
+	for (size_t x = 0; x < ctx->pos; x++)
+	{
+		char* msg = cnv.cp + ctx->pos * sizeof(char*) + x * UNWIND_MAX_LINE_SIZE;
+		const unwind_info_t* info = &ctx->info[x];
+		Dl_info dlinfo = { 0 };
+		int rc = dladdr((void*)info->pc, &dlinfo);
+
+		cnv.cpp[x] = msg;
+
+		if (rc == 0)
+			_snprintf(msg, UNWIND_MAX_LINE_SIZE, "unresolvable, address=%p", (void*)info->pc);
+		else
+			_snprintf(msg, UNWIND_MAX_LINE_SIZE, "dli_fname=%s [%p], dli_sname=%s [%p]",
+			          dlinfo.dli_fname, dlinfo.dli_fbase, dlinfo.dli_sname, dlinfo.dli_saddr);
+	}
+
+	return cnv.cpp;
+}