Hello WebKittens,
I've added a new debugging helper, `WTF::structDump` to JSC `dataLog` debugging
helper families[1].
This leverages clang's `__builtin_dump_struct` function[2] and generates
debugging-friendly struct-dump for *any* struct / class without having any
special code to these classes.
Use case is, for example,
```
DFG::Node* node = ...;
dataLogLn(structDump(*node)); // Or any instances of your classes / structs
```
then, it automatically generates the output like this,
```
JSC::DFG::Node {
NodeOrigin origin = *0x10631d800
NodeType m_op = 59
unsigned int m_index = 323
AdjacencyList children = *0x10631d818
VirtualRegister m_virtualRegister = *0x10631d830
unsigned int m_refCount = 1
NodeFlags m_flags = 344069
SpeculatedType m_prediction = 206158430208
OpInfoWrapper m_opInfo = *0x10631d848
OpInfoWrapper m_opInfo2 = *0x10631d850
union (unnamed) m_misc = {
Node * replacement = 0x0
unsigned int epoch = 0
}
BasicBlock * owner = 0x1061177b0
}
```
Currently, only clang supports this builtin. On GCC, we will just use
pointerDump which dumps a pointer hex value.
There is a feature request bug in GCC[3], and once it gets implemented, we can
support GCC too.
Happy hacking!
Best regards,
-Yusuke Suzuki
[1]:
https://github.com/WebKit/WebKit/commit/3c94ba6d70070d52a469c04ece16da7d0edb467b
[2]: https://clang.llvm.org/docs/LanguageExtensions.html#builtin-dump-struct
[3]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83161_______________________________________________
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