[cfe-dev] Matching function argument that may not be valid

[Daniel Dilts]

On Fri, Apr 17, 2015 at 5:19 PM, Manuel Klimek <klimek at google.com> wrote:

>
>
> On Thu, Apr 16, 2015 at 5:45 PM Daniel Dilts <diltsman at gmail.com> wrote:
>
>> I am attempting to write a tool that will generate a table from tokens
>> pulled from source code.
>>
>> I have a static template function in a template class.  I want to find
>> the first argument for all calls to the template function.
>>
>> The problem is that the token may or may not be defined, since they will
>> be defined in a generated table.
>>
>> If I use dump-ast it appears that the function call is omitted from the
>> AST, so I don't think that I can use AST matchers to find it.
>>
>
> I somehow can't believe that - all calls are in the AST.
>


Here is my example, using "clang version 3.7.0 (trunk 235602)".  Note that
the call to Func is not present in the AST.

enum MyEnum
{
};
void Func(MyEnum v);
int main()
{
 Func(SomeEnumValue);
 return 0;
}




clang.exe -Xclang -ast-dump test.cpp
test.cpp:7:7: error: use of undeclared identifier 'SomeEnumValue'
        Func(SomeEnumValue);
             ^
TranslationUnitDecl 0x836140 <<invalid sloc>> <invalid sloc>
|-CXXRecordDecl 0x836400 <<invalid sloc>> <invalid sloc> implicit class
type_inf
o
| `-TypeVisibilityAttr 0x836470 <<invalid sloc>> Implicit Default
|-TypedefDecl 0x8364b0 <<invalid sloc>> <invalid sloc> implicit size_t
'unsigned
 int'
|-TypedefDecl 0x836508 <<invalid sloc>> <invalid sloc> implicit
__builtin_va_lis
t 'char *'
|-EnumDecl 0x836538 <test.cpp:1:1, line:3:1> line:1:6 referenced MyEnum
'int'
|-FunctionDecl 0x836630 <line:4:1, col:19> col:6 Func 'void (enum MyEnum)'
| `-ParmVarDecl 0x8365b8 <col:11, col:18> col:18 v 'enum MyEnum'
`-FunctionDecl 0x836718 <line:5:1, line:9:1> line:5:5 main 'int (void)'
  `-CompoundStmt 0x836880 <line:6:1, line:9:1>
    `-ReturnStmt 0x836870 <line:8:2, col:9>
      `-IntegerLiteral 0x836850 <col:9> 'int' 01 error generated.
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