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https://github.com/wolfpld/tracy.git
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Instead of calling dladdr inside the dl_iterate_phdr callback, do it outside to avoid deadlocks with other loader code
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@ -135,7 +135,8 @@ public:
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private:
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tracy::FastVector<ImageEntry> m_images;
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bool m_updated;
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bool m_updated = false;
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bool m_haveMainImageName = false;
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static int Callback( struct dl_phdr_info* info, size_t size, void* data )
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{
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@ -153,26 +154,13 @@ private:
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image->m_startAddress = startAddress;
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image->m_endAddress = endAddress;
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const char* imageName = nullptr;
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// the base executable name isn't provided when iterating with dl_iterate_phdr, get it with dladdr()
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// the base executable name isn't provided when iterating with dl_iterate_phdr,
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// we will have to patch the executable image name outside this callback
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if( info->dlpi_name && info->dlpi_name[0] != '\0' )
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{
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imageName = info->dlpi_name;
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}
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else
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{
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Dl_info dlInfo;
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if( dladdr( (void *)info->dlpi_addr, &dlInfo ) )
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{
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imageName = dlInfo.dli_fname;
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}
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}
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if( imageName )
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{
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size_t sz = strlen( imageName ) + 1;
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size_t sz = strlen( info->dlpi_name ) + 1;
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image->m_name = (char*)tracy_malloc( sz );
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memcpy( image->m_name, imageName, sz );
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memcpy( image->m_name, info->dlpi_name, sz );
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}
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else
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{
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@ -198,9 +186,42 @@ private:
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{
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std::sort( m_images.begin(), m_images.end(),
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[]( const ImageEntry& lhs, const ImageEntry& rhs ) { return lhs.m_startAddress > rhs.m_startAddress; } );
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// patch the main executable image name here, as calling dl_* functions inside the dl_iterate_phdr callback might cause deadlocks
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UpdateMainImageName();
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}
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}
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void UpdateMainImageName()
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{
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if( m_haveMainImageName )
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{
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return;
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}
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for( ImageEntry& entry : m_images )
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{
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if( entry.m_name == nullptr )
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{
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Dl_info dlInfo;
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if( dladdr( (void *)entry.m_startAddress, &dlInfo ) )
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{
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if( dlInfo.dli_fname )
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{
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size_t sz = strlen( dlInfo.dli_fname ) + 1;
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entry.m_name = (char*)tracy_malloc( sz );
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memcpy( entry.m_name, dlInfo.dli_fname, sz );
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}
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}
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// we only expect one entry to be null for the main executable entry
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break;
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}
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}
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m_haveMainImageName = true;
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}
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const ImageEntry* GetImageForAddressImpl( void* address ) const
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{
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auto it = std::lower_bound( m_images.begin(), m_images.end(), address,
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@ -221,6 +242,7 @@ private:
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}
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m_images.clear();
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m_haveMainImageName = false;
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}
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};
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#endif //#ifdef TRACY_USE_IMAGE_CACHE
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