Also adds the CMake infrastructure to compile and link the D source files.
The build is partially broken:
- A few files in Phobos and druntime do not build
- MSVC build is broken because of unresolved symbols involving reals
Now with *almost* working EH codegen. Does not compile Phobos yet
because we run into the "instruction does not dominate all uses"
issue when an r-value result of toElemDtor is used and we need to
run cleanups in between. Should easily be fixed by promoting those
values to allocas.
Most of the changes outside of ir/irfunction.{h, cpp} are just
because CreateCallOrInvoke moved locations. I took the
opportunity to also make use of the different arg count
overloads where possible.
Never generates any landing pads or invoke instructions right now
for simplicity. The code for emitting them will be added back in
the next step.
The "after..." blocks without any precedessors remain for now, as
we need a clean way to suppress any codegen for that block (but
not new blocks, which might resolve labels) before tackling that
one.
Builds druntime/Phobos on OS X x86_64 (albeit without EH, of course).
Specifying the basic block before which to insert the new one
is not mandatory when calling llvm::BasicBlock::Create. This
was the only use of the tracked "end" block. The concept was
phony anyway because there is no single "end" to a scope with
unwinding and so on.
For prettying up the IR, it is possible to change the order
of basic blocks using move{Before, After}().
If function main() has return type void then a 'return 0;' is
automatically appended to the statements. Set the end of the
function as the location of this statement. This helps with the
debug information in LDC.
Don't do it at a more global level because disturbs the coverage
code.
Debug information is based on static lexical blocks. Most calls to
EmitFuncEnd() are done if control flow reaches the end of the
function which is quite different.
Otherwise, we may end up with a wrong enclosing statement. It could
happen if a try-finally is rewritten as a try-catch (see NrvoWalker).
In this case, enclosingScopeExit will still point to the old unused
try-finally.
