Hello!
I'm working on an expressions evaluation on Windows, and currently I'm
trying to make a JIT evaluation working.
When I'm trying to evaluate the next expression:
print S::x
on the next code:
struct S {
static int x;
void foo() { }
};
int S::x = 5;
int main() {
S().foo(); // here
return 0;
}
the evaluation requires JIT (but printing of global variables requires not,
and I can't figure out what is the key difference between a class static
variable and a global variable in the case?).
During symbols resolving IRExecutionUnit::FindInSymbols is used, and it
searches a symbol among functions (which is not our case), and then calls
Module::FindSymbolsWithNameAndType for each module in the list. This
function looks symbols up in a Symtab, which is retrieved through a
SymbolVendor, and it retrieves one from an ObjectFile. ELF files contain
symbols for such a variables in their symbol tables, but the problem is
that PE files usually contain info about exported (and imported) symbols
only, so the lookup in Symtab fails.
I think that we need somehow to retrieve a symbols info from a symbol file.
I thought that we can emit a Symtab from a SymbolFile just like from an
ObjectFile (and for now implement it for SymbolFilePDB only), but I'm not
sure if this solution is good. How can we solve the problem else?
--
Aleksandr Urakov
Software Developer
JetBrains
http://www.jetbrains.com
The Drive to Develop
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