Support a new assembler directive, .import_global, to declare imported
global variables (i.e. those with external linkage and no
initializer). The linker turns these into wasm imports.
Patch by Jacob Gravelle
Differential Revision: https://reviews.llvm.org/D26875
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288296 91177308-0d34-0410-b5e6-96231b3b80d8
This new syntax is built around putting each instruction on its own line
in a "mnemonic op, op, op" like syntax. It also uses conventional data
section directives like ".byte" and so on rather than requiring everything
to be in hierarchical S-expression format. This is a more natural syntax
for a ".s" file format from the perspective of LLVM MC and related tools,
while remaining easy to translate into other forms as needed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@249364 91177308-0d34-0410-b5e6-96231b3b80d8
Do the same for .weak (not implemented for now, but may as well to it). Update comment string to two semicolons.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245982 91177308-0d34-0410-b5e6-96231b3b80d8
