flatten 20260225

tjp/core/debug/android/Stack.cpp

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+// License: Modified MIT (NON-AI)
+// See the LICENSE file in the root directory for license information.
+// Copyright 2025 Timothy Prepscius
+
+#ifdef TJP_CORE_HEADER_ONLY
+	#pragma once
+#endif
+
+#include "../../header_only/compile.h"
+
+#include "../Stack.h"
+#include "../../system/System.h"
+
+#include <unwind.h>
+#include <dlfcn.h>
+#include <iomanip>
+#include <sstream>
+
+// https://stackoverflow.com/questions/8115192/android-ndk-getting-the-backtrace
+struct BacktraceState
+{
+    void** current;
+    void** end;
+};
+
+
+TJP_CORE_HEADER_ONLY_INLINE
+static _Unwind_Reason_Code unwindCallback(struct _Unwind_Context* context, void* arg)
+{
+    BacktraceState* state = static_cast<BacktraceState*>(arg);
+    uintptr_t pc = _Unwind_GetIP(context);
+    if (pc) {
+        if (state->current == state->end) {
+            return _URC_END_OF_STACK;
+        } else {
+            *state->current++ = reinterpret_cast<void*>(pc);
+        }
+    }
+    return _URC_NO_REASON;
+}
+
+TJP_CORE_HEADER_ONLY_INLINE
+size_t captureBacktrace(void** buffer, size_t max)
+{
+    BacktraceState state = {buffer, buffer + max};
+    _Unwind_Backtrace(unwindCallback, &state);
+
+    return state.current - buffer;
+}
+
+TJP_CORE_HEADER_ONLY_INLINE
+void dumpBacktrace(std::ostream& os, void** buffer, size_t count)
+{
+    for (size_t idx = 0; idx < count; ++idx) {
+        const void* addr = buffer[idx];
+        const char* symbol = "";
+
+        Dl_info info;
+        if (dladdr(addr, &info) && info.dli_sname) {
+            symbol = info.dli_sname;
+        }
+
+        os << "  #" << std::setw(2) << idx << ": " << addr << "  " << symbol << "\n";
+    }
+}
+
+namespace tjp::core {
+
+TJP_CORE_HEADER_ONLY_INLINE
+std::string getStackString(int maxStackDepth)
+{
+	auto buffer = (void **)alloca(sizeof(void *) * maxStackDepth);
+	auto count = captureBacktrace(buffer, maxStackDepth);
+	
+	std::ostringstream oss;
+	dumpBacktrace(oss, buffer, count);
+
+	return oss.str();
+}
+
+} // namespace