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Merge pull request #1 from MaxDZ8/bugfix-40-memory-leaks

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Issue#40 Fix memory leaks caused by string flags allocated via placement new.
This commit is contained in:
Andreas Schuh 2013-05-30 09:50:08 -07:00
commit 8c915538df
5 changed files with 285 additions and 34 deletions
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29
README_windows.txt
View file

@ -1,7 +1,15 @@
You can compile this under Windows, if you want. The solution file
(for VC 7.1 and later) is in this directory.
I've been told the following steps work to compile this under win64:
In general there are two build configurations.
- "Debug": x86 .dll with statically linked runtime (/MTd)
- "Release": x86 .dll with statically linked runtime (/MT)
For VC 11 (Visual Studio 2012) there are additional build targets to produce
statically linked libraries, both using the runtime DLL in either debug (/MDd)
or release mode (/MD).
Shall you need 64-bit builds, you will have to create them.
I've been told the following steps work:
1) Open the provided solution file
2) Click on the Win32 target (on the right of Debug/Release)
3) Choose Configuration Manager
@ -10,17 +18,16 @@ I've been told the following steps work to compile this under win64:
In "Copy settings from:" choose Win32.
6) Ok and then Close
I don't know very much about how to install DLLs on Windows, so you'll
have to figure out that part for yourself. If you choose to just
re-use the existing .sln, make sure you set the IncludeDir's
appropriately! Look at the properties for libgflags.dll.
Installing DLLs in Windows is probably better managed using an installer so
it's not going to be covered here.
When it comes to the static library, VC canon would be to just import the
libgflags project as a referenced assembly.
You can also create a static library of gflags. To do this, add
When building or using gflags as static library the following defines must be
added to the compile of every gflags .cc file as well as any other project
referencing or including gflags files:
/D GFLAGS_DLL_DECL= /D GFLAGS_DLL_DECLARE_FLAG= /D GFLAGS_DLL_DEFINE_FLAG=
to the compile line of every gflags .cc file.
If you create a static library that *uses* flags (that is, DEFINEs or
DECLAREs flags), you will need to add the following to every .cc file
that defines or declares a flag (it's safe to add them to every .cc
file in your project):
When creating static library that *uses* gflags (that is, DEFINEs or
DECLAREs flags), adding the following will suffice:
/D GFLAGS_DLL_DECLARE_FLAG= /D GFLAGS_DLL_DEFINE_FLAG=

10
gflags-vs2012.sln
View file

@ -6,16 +6,26 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "gflags_unittest", "vsprojec
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug LIB runtime DLL|Win32 = Debug LIB runtime DLL|Win32
Debug|Win32 = Debug|Win32
Release LIB runtime DLL|Win32 = Release LIB runtime DLL|Win32
Release|Win32 = Release|Win32
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Debug LIB runtime DLL|Win32.ActiveCfg = Debug LIB runtime DLL|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Debug LIB runtime DLL|Win32.Build.0 = Debug LIB runtime DLL|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Debug|Win32.ActiveCfg = Debug|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Debug|Win32.Build.0 = Debug|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Release LIB runtime DLL|Win32.ActiveCfg = Release LIB runtime DLL|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Release LIB runtime DLL|Win32.Build.0 = Release LIB runtime DLL|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Release|Win32.ActiveCfg = Release|Win32
{FB27FBDB-E6C0-4D00-A7F8-1EEEF1B48ABC}.Release|Win32.Build.0 = Release|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Debug LIB runtime DLL|Win32.ActiveCfg = Debug LIB runtime DLL|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Debug LIB runtime DLL|Win32.Build.0 = Debug LIB runtime DLL|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Debug|Win32.ActiveCfg = Debug|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Debug|Win32.Build.0 = Debug|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Release LIB runtime DLL|Win32.ActiveCfg = Release LIB runtime DLL|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Release LIB runtime DLL|Win32.Build.0 = Release LIB runtime DLL|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Release|Win32.ActiveCfg = Release|Win32
{4B263748-5F0F-468C-8C5C-ED2682BB6BE3}.Release|Win32.Build.0 = Release|Win32
EndGlobalSection

73
src/windows/gflags/gflags.h
View file

@ -139,6 +139,11 @@ extern GFLAGS_DLL_DECL bool RegisterFlagValidator(const std::string* flag,
bool (*validate_fn)(const char*,
const std::string&));
// Convenience macro for the registration of a flag validator
#define DEFINE_validator(name, validator) \
static const bool name##_validator_registered = \
::google::RegisterFlagValidator(&FLAGS_##name, validator)
// --------------------------------------------------------------------
// These methods are the best way to get access to info about the
@ -526,19 +531,54 @@ GFLAGS_DLL_DECL bool IsBoolFlag(bool from);
// try to avoid crashes in that case, we use a char buffer to store
// the string, which we can static-initialize, and then placement-new
// into it later. It's not perfect, but the best we can do.
//
// This does have a caveat however: destructor must be called explicitly
// on objects created by placement-new. For a long time, those strings were not
// released, thus causing leaks. This clutters debuggers and has been reported
// as a bug. The goal of the original author was to allow global destructors to
// access the flag value but the value of this practice could be debated; the
// library now always releases strings, even when allocated by placement-new.
namespace fLS {
inline clstring* dont_pass0toDEFINE_string(char *stringspot,
const char *value) {
return new(stringspot) clstring(value);
}
inline clstring* dont_pass0toDEFINE_string(char *stringspot,
const clstring &value) {
return new(stringspot) clstring(value);
}
inline clstring* dont_pass0toDEFINE_string(char *stringspot,
int value);
// Keep track of when strings are allocated using placement-new so we can
// release them properly. Objects of this kind are instantiated near the flag
// being accessed and thus get destroyed after all destructors using the flag
// have been executed (DEFINE is assumed to happen before objects using it are
// defined). It would still be possible to route pointers through user programs
// so dtors access a flag after this has been destroyed however
// 1- use case appears contrived, furthermore if you want to escape standard
// C++ scope rules, you should be taking care of it, not us. And not at the
// expense of typical users.
// 2- it is somewhat coherent with construction rules. You can get a pointer to
// them but they'll likely be rubbish.
// It's not perfect, but the best we can do.
// Hopefully the 1-byte per-string-flag overhead won't push anyone off a cliff.
class ResettingStringBuffer {
// Previously in DEFINE_string macro
union { void* align; char s[sizeof(clstring)]; } mem;
bool clear; // for exceptions, remember if your memory is NOT garbage.
public:
ResettingStringBuffer() : clear(false) { }
clstring* str() { return reinterpret_cast<clstring*>(&mem.s[0]); }
~ResettingStringBuffer() {
if(clear) str()->~clstring();
}
clstring* dont_pass0toDEFINE_string(const char *value) {
new(str()) clstring(value);
clear = true;
return str();
}
clstring* dont_pass0toDEFINE_string(const clstring &value) {
new(str()) clstring(value);
clear = true;
return str();
}
private:
// Bail out. We don't want you to do anything else. It's a string!
template<typename BLAH>
clstring* dont_pass0toDEFINE_string(BLAH value);
};
} // namespace fLS
// We need to define a var named FLAGS_no##name so people don't define
@ -551,13 +591,14 @@ inline clstring* dont_pass0toDEFINE_string(char *stringspot,
#define DEFINE_string(name, val, txt) \
namespace fLS { \
using ::fLS::clstring; \
static union { void* align; char s[sizeof(clstring)]; } s_##name[2]; \
static ResettingStringBuffer s_def_val_for_##name; \
static ResettingStringBuffer s_cur_val_for_##name; \
clstring* const FLAGS_no##name = ::fLS:: \
dont_pass0toDEFINE_string(s_##name[0].s, \
val); \
static ::google::FlagRegisterer o_##name( \
s_def_val_for_##name.dont_pass0toDEFINE_string(val); \
static ::google::FlagRegisterer o_##name( \
#name, "string", MAYBE_STRIPPED_HELP(txt), __FILE__, \
s_##name[0].s, new (s_##name[1].s) clstring(*FLAGS_no##name)); \
s_def_val_for_##name.str(), \
s_cur_val_for_##name.dont_pass0toDEFINE_string(*FLAGS_no##name)); \
extern GFLAGS_DLL_DEFINE_FLAG clstring& FLAGS_##name; \
using fLS::FLAGS_##name; \
clstring& FLAGS_##name = *FLAGS_no##name; \

95
vsprojects/gflags_unittest/gflags_unittest-vs2012.vcxproj
View file

@ -1,10 +1,18 @@
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@ -21,35 +29,63 @@
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@ -69,6 +105,28 @@
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@ -88,26 +146,51 @@
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112
vsprojects/libgflags/libgflags-vs2012.vcxproj
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@ -1,10 +1,18 @@
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