pdb::error: include function name in error message

4 files changed, 36 insertions, 18 deletions

diff --git a/src/dbghelp.cpp b/src/dbghelp.cpp
index 4b8df7a..c9db499 100644
--- a/src/dbghelp.cpp
+++ b/src/dbghelp.cpp
@@ -28,12 +28,12 @@ void initialize(HANDLE id, bool invade_current_process) {
     set_dbghelp_options();
 
     if (!SymInitialize(id, NULL, invade_current_process ? TRUE : FALSE))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymInitialize");
 }
 
 void clean_up(HANDLE id) {
     if (!SymCleanup(id))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymCleanup");
 }
 
 Address next_offline_base = 0x10000000;
@@ -50,7 +50,7 @@ ModuleInfo get_module_info(HANDLE id, Address offline_base) {
     ModuleInfo info;
 
     if (!SymGetModuleInfoW64(id, offline_base, &static_cast<ModuleInfo::Impl&>(info)))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymGetModuleInfoW64");
 
     return info;
 }
@@ -83,7 +83,7 @@ void enum_symbols(HANDLE id,
                          boost::nowide::widen(mask).c_str(),
                          &enum_symbols_callback,
                          const_cast<DbgHelp::OnSymbol*>(&callback)))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymEnumSymbolsW");
 }
 
 } // namespace
@@ -135,7 +135,7 @@ ModuleInfo DbgHelp::load_pdb(const std::string& path) const {
         SymLoadModule64(id, NULL, _path.data(), NULL, gen_next_offline_base(size), size);
 
     if (!offline_base)
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymLoadModule64");
 
     return get_module_info(id, offline_base);
 }
@@ -143,7 +143,7 @@ ModuleInfo DbgHelp::load_pdb(const std::string& path) const {
 void DbgHelp::enum_modules(const OnModule& callback) const {
     ModuleEnumerator enumerator{id, callback};
     if (!SymEnumerateModulesW64(id, &enum_modules_callback, &enumerator))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymEnumerateModulesW64");
 }
 
 ModuleInfo DbgHelp::resolve_module(Address offline) const {
@@ -173,7 +173,7 @@ SymbolInfo DbgHelp::resolve_symbol(Address offline) const {
     SymbolInfo symbol;
 
     if (!SymFromAddrW(id, offline, &displacement, &static_cast<SYMBOL_INFOW&>(symbol)))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymFromAddrW");
 
     symbol.set_displacement(displacement);
     return symbol;
@@ -183,7 +183,7 @@ SymbolInfo DbgHelp::resolve_symbol(const std::string& name) const {
     SymbolInfo symbol;
 
     if (!SymFromNameW(id, boost::nowide::widen(name).c_str(), &static_cast<SYMBOL_INFOW&>(symbol)))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymFromNameW");
 
     return symbol;
 }
@@ -196,7 +196,7 @@ LineInfo DbgHelp::resolve_line(Address offline) const {
     DWORD displacement = 0;
 
     if (!SymGetLineFromAddrW64(id, offline, &displacement, &impl))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "SymGetLineFromAddrW64");
 
     return LineInfo{impl};
 }
diff --git a/src/error.cpp b/src/error.cpp
index 74cf395..368feb7 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -9,7 +9,9 @@
 
 #include <windows.h>
 
+#include <sstream>
 #include <string>
+#include <system_error>
 
 namespace pdb {
 namespace error {
@@ -22,9 +24,13 @@ std::wstring trim_trailing_newline(const std::wstring& s) {
     return s.substr(0, last_pos + 1);
 }
 
-} // namespace
+std::string build_what(DWORD code, const char* function) {
+    std::ostringstream what;
+    what << "Function " << function << " failed with error code " << code;
+    return what.str();
+}
 
-std::string CategoryWindows::message(int code) const {
+std::string format_message(int code) {
     wchar_t* buf;
 
     const auto len = FormatMessageW(
@@ -46,5 +52,17 @@ std::string CategoryWindows::message(int code) const {
     return boost::nowide::narrow(trim_trailing_newline(msg));
 }
 
+} // namespace
+
+std::string CategoryWindows::message(int code) const {
+    return format_message(code);
+}
+
+std::system_error windows(DWORD code, const char* function) {
+    static_assert(sizeof(DWORD) == sizeof(int), "Aren't DWORDs the same size as ints?");
+    return std::system_error{
+        static_cast<int>(code), category_windows(), build_what(code, function)};
+}
+
 } // namespace error
 } // namespace pdb
diff --git a/src/process.cpp b/src/process.cpp
index 08319fa..281ee86 100644
--- a/src/process.cpp
+++ b/src/process.cpp
@@ -24,7 +24,7 @@ constexpr DWORD permissions = PROCESS_QUERY_INFORMATION | PROCESS_VM_READ;
 Handle open_process(DWORD id) {
     Handle process{OpenProcess(permissions, FALSE, id)};
     if (!process) {
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "OpenProcess");
     }
     return process;
 }
@@ -61,7 +61,7 @@ std::string get_current_executable_path(PathBuffer& buffer) {
     const auto ec = ::GetModuleFileNameW(NULL, buffer.get_data(), buffer.get_size());
 
     if (ec == 0) {
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "GetModuleFileNameW");
     }
 
     if (ec == buffer.get_size() && GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
@@ -91,7 +91,7 @@ std::string get_executable_path(const Handle& process, PathBuffer& buffer) {
         return get_executable_path(process, buffer);
     }
 
-    throw error::windows(GetLastError());
+    throw error::windows(GetLastError(), "QueryFullProcessImageNameW");
 }
 
 std::string get_executable_path(const Handle& process) {
diff --git a/src/utils/file.cpp b/src/utils/file.cpp
index 8380fe9..fb106ec 100644
--- a/src/utils/file.cpp
+++ b/src/utils/file.cpp
@@ -27,12 +27,12 @@ std::size_t get_size(const std::string& path) {
                                     NULL)};
 
     if (handle.get() == INVALID_HANDLE_VALUE)
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "CreateFileW");
 
     LARGE_INTEGER size;
 
     if (!GetFileSizeEx(handle.get(), &size))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "GetFileSizeEx");
 
     std::size_t result = 0;
 
@@ -52,12 +52,12 @@ ID query_id(const std::string& path) {
                                     NULL)};
 
     if (handle.get() == INVALID_HANDLE_VALUE)
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "CreateFileW");
 
     FILE_ID_INFO id;
 
     if (!GetFileInformationByHandleEx(handle.get(), FileIdInfo, &id, sizeof(id)))
-        throw error::windows(GetLastError());
+        throw error::windows(GetLastError(), "GetFileInformationByHandleEx");
 
     return {id};
 }