dbg_engine: shift thread register reads / process memory reads -> abstraction layer, rather than directly calling into demon; cache crash dump info, like thread info & memory ranges; implement thread reg reads & memory reads for dumps by using this acceleration structure when we have a dump handle, instead of regular demon reads.

src/arch/arch_inc.c

@@ -2,6 +2,7 @@
 // Licensed under the MIT license (https://opensource.org/license/mit/)
 
 #include "arch/arch.c"
+#include "arch/os/arch_os.c"
 #if defined(DWARF_H)
 # include "arch/dwarf/arch_dwarf.c"
 #endif

src/arch/arch_inc.h

@@ -5,6 +5,7 @@
 #define ARCH_INC_H
 
 #include "arch/arch.h"
+#include "arch/os/arch_os.h"
 #if defined(DWARF_H)
 # include "arch/dwarf/arch_dwarf.h"
 #endif

src/arch/os/arch_os.c

@@ -0,0 +1,16 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+internal B32
+arch_os_write_reg_block_from_thread_ctx(Arch arch, OperatingSystem os, void *reg_block, void *thread_ctx)
+{
+  B32 result = 0;
+  if(0){}
+#define Case(arch_, os_, impl) else if((arch) == arch_ && (os) == os_) do {result = impl(reg_block, thread_ctx);}while(0)
+#if defined(X64_H) && defined(WIN32_X64_H)
+  Case(Arch_x64, OperatingSystem_Windows, w32_x64_write_reg_block_from_thread_ctx);
+#endif
+#undef Case
+  else{}
+  return result;
+}

src/arch/os/arch_os.h

@@ -0,0 +1,9 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#ifndef ARCH_OS_H
+#define ARCH_OS_H
+
+internal B32 arch_os_write_reg_block_from_thread_ctx(Arch arch, OperatingSystem os, void *reg_block, void *thread_ctx);
+
+#endif // ARCH_OS_H