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Support __builtin_dynamic_object_size #8156

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merged 1 commit into from
Mar 15, 2024
Merged

Support __builtin_dynamic_object_size #8156

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8 changes: 6 additions & 2 deletions src/ansi-c/c_typecheck_expr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3512,11 +3512,15 @@ exprt c_typecheck_baset::do_special_functions(

return typecast_exprt(expr.arguments()[0], expr.type());
}
else if(identifier=="__builtin_object_size")
else if(
identifier == "__builtin_object_size" ||
identifier == "__builtin_dynamic_object_size")
{
// this is a gcc extension to provide information about
// These are gcc extensions to provide information about
// object sizes at compile time
// http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html
// Our behavior is as if it was never possible to determine the object that
// the pointer pointed to.

if(expr.arguments().size()!=2)
{
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1 change: 1 addition & 0 deletions src/ansi-c/compiler_headers/gcc_builtin_headers_mem_string.h
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Expand Up @@ -119,6 +119,7 @@ void* __builtin_memmove(void*, const void*, __CPROVER_size_t);
void* __builtin_mempcpy(void*, const void*, __CPROVER_size_t);
void* __builtin_memset(void*, int, __CPROVER_size_t);
__CPROVER_size_t __builtin_object_size(const void*, int);
__CPROVER_size_t __builtin_dynamic_object_size(const void*, int);
int __builtin_popcount(unsigned);
int __builtin_popcountimax(uintmax_t);
int __builtin_popcountll(unsigned long long int x);
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