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Fix symbol resolution for malloc_type functions on macOS Sequoia
This commit addresses an issue with symbol resolution for malloc_type functions on the latest macOS Sequoia. The problem arises due to changes in how these functions are named in the dynamic symbol table of the system libraries that are part of the linker cache like the ones that contain the C++ runtime. This fix ensures that Memray correctly intercepts and tracks allocations made by malloc_type functions, fixing tracking allocations in the C++ runtime and other system libraries on macOS Sequoia.
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src/memray/_memray/macho_shenanigans.cpp

+13-2
Original file line numberDiff line numberDiff line change
@@ -36,6 +36,15 @@ patch_symbol(
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}
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}
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static inline const char*
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get_canonical_name(const char* name) {
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const char* prefix = "_malloc_type";
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if (strncmp(name, prefix, strlen(prefix)) != 0) {
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return name;
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}
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return name + strlen(prefix);
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}
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static void
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patch_symbols_in_section(
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const section_t* section,
@@ -49,8 +58,9 @@ patch_symbols_in_section(
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if (!symbol_name || !(symbol_name[0] == '_' || symbol_name[0] == '.') || !symbol_name[1]) {
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continue;
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}
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const char* canonical_name = get_canonical_name(symbol_name);
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#define FOR_EACH_HOOKED_FUNCTION(hookname) \
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if (strcmp(MEMRAY_ORIG(hookname).d_symbol, symbol_name + 1) == 0) { \
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if (strcmp(MEMRAY_ORIG(hookname).d_symbol, canonical_name + 1) == 0) { \
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LOG(DEBUG) << "Patching " << symbol_name << " symbol pointer at " << std::hex << std::showbase \
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<< *(symbol_addr_table + i) << " for relocation entry " << (symbol_addr_table + i); \
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patch_symbol( \
@@ -225,9 +235,10 @@ patch_stubs(
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if (!symbol_name || !(symbol_name[0] == '_' || symbol_name[0] == '.') || !symbol_name[1]) {
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continue;
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}
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const char* canonical_name = get_canonical_name(symbol_name);
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auto stub_addr = reinterpret_cast<uint64_t>(symbol_addr_table + i * element_size);
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#define FOR_EACH_HOOKED_FUNCTION(hookname) \
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if (strcmp(MEMRAY_ORIG(hookname).d_symbol, symbol_name + 1) == 0) { \
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if (strcmp(MEMRAY_ORIG(hookname).d_symbol, canonical_name + 1) == 0) { \
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LOG(DEBUG) << "Extracting symbol address for " << symbol_name << " from stub function at " \
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<< std::hex << std::showbase << stub_addr; \
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void* symbol_addr = reinterpret_cast<void*>(lazy_pointer_from_stub(stub_addr)); \

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