From c67055bad3cdfc93e2ac57d87f36c6e0993af690 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Wed, 17 May 2017 06:00:20 +0300
Subject: initial commit

---
 src/dbghelp.cpp | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 src/dbghelp.cpp

(limited to 'src/dbghelp.cpp')

diff --git a/src/dbghelp.cpp b/src/dbghelp.cpp
new file mode 100644
index 0000000..c319fee
--- /dev/null
+++ b/src/dbghelp.cpp
@@ -0,0 +1,166 @@
+// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "PDB repository" project.
+// For details, see https://github.com/egor-tensin/pdb-repo.
+// Distributed under the MIT License.
+
+#include "pdb/all.hpp"
+
+#include <Windows.h>
+#include <DbgHelp.h>
+
+#include <cstddef>
+#include <cstring>
+
+#include <limits>
+#include <stdexcept>
+#include <string>
+
+namespace pdb
+{
+    namespace
+    {
+        void enable_debug_output()
+        {
+            SymSetOptions(SymGetOptions() | SYMOPT_DEBUG | SYMOPT_UNDNAME);
+        }
+
+        void initialize(HANDLE id)
+        {
+            enable_debug_output();
+            const auto ret = SymInitialize(id, NULL, FALSE);
+            if (!ret)
+                throw error::windows(GetLastError());
+        }
+
+        void clean_up(HANDLE id)
+        {
+            const auto ret = SymCleanup(id);
+            if (!ret)
+                throw error::windows(GetLastError());
+        }
+
+        Address gen_next_offline_base(std::size_t pdb_size)
+        {
+            static Address id = 0x10000000;
+            const auto next = id;
+            id += pdb_size;
+            return next;
+        }
+
+        BOOL CALLBACK enum_symbols_callback(
+            SYMBOL_INFO *info,
+            ULONG,
+            VOID *raw_callback_ptr)
+        {
+            const auto callback_ptr = reinterpret_cast<DbgHelp::OnSymbol*>(raw_callback_ptr);
+            const auto& callback = *callback_ptr;
+            callback(SymbolInfo{*info});
+            return TRUE;
+        }
+    }
+
+    DbgHelp::DbgHelp()
+    {
+        initialize(id);
+    }
+
+    ModuleInfo DbgHelp::load_pdb(const std::string& path) const
+    {
+        const auto size = file::get_size(path);
+
+        if (size > std::numeric_limits<DWORD>::max())
+            throw std::range_error{"PDB file size is too large"};
+
+        const auto offline_base = SymLoadModule64(
+            id,
+            NULL,
+            path.c_str(),
+            NULL,
+            gen_next_offline_base(size),
+            static_cast<DWORD>(size));
+
+        if (!offline_base)
+            throw error::windows(GetLastError());
+
+        return get_module_info(offline_base);
+    }
+
+    ModuleInfo DbgHelp::get_module_info(Address offline_base) const
+    {
+        ModuleInfo info;
+
+        const auto ret = SymGetModuleInfo64(
+            id,
+            offline_base,
+            &static_cast<ModuleInfo::Raw&>(info));
+
+        if (!ret)
+            throw error::windows(GetLastError());
+
+        return info;
+    }
+
+    void DbgHelp::enum_symbols(const ModuleInfo& module, const OnSymbol& callback) const
+    {
+        const auto ret = SymEnumSymbols(
+            id,
+            module.get_offline_base(),
+            NULL,
+            &enum_symbols_callback,
+            const_cast<OnSymbol*>(&callback));
+
+        if (!ret)
+            throw error::windows(GetLastError());
+    }
+
+    SymbolInfo DbgHelp::resolve_symbol(Address online) const
+    {
+        DWORD64 displacement = 0;
+        SymbolInfo symbol;
+
+        const auto ret = SymFromAddr(
+            id,
+            online,
+            &displacement,
+            &static_cast<SYMBOL_INFO&>(symbol));
+
+        if (!ret)
+            throw error::windows(GetLastError());
+
+        return symbol;
+    }
+
+    SymbolInfo DbgHelp::resolve_symbol(const std::string& name) const
+    {
+        SymbolInfo symbol;
+
+        const auto ret = SymFromName(
+            id,
+            name.c_str(),
+            &static_cast<SYMBOL_INFO&>(symbol));
+
+        if (!ret)
+            throw error::windows(GetLastError());
+
+        return symbol;
+    }
+
+    void DbgHelp::close()
+    {
+        if (!closed)
+        {
+            clean_up(id);
+            closed = true;
+        }
+    }
+
+    DbgHelp::~DbgHelp()
+    {
+        try
+        {
+            close();
+        }
+        catch (...)
+        { }
+    }
+}
-- 
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