https://bugs.llvm.org/show_bug.cgi?id=41610
Bug ID: 41610
Summary: Importing mutable global in WebAssembly
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: m...@joachim-breitner.de
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
I am trying to create a shared webassembly library from C code, and compiling
the C file with `-fpic` and linking with `--shared` looks promising.
I want to import a mutable global from the host environment. My first attempt
was to write
extern int imported_global;
and that indeed causes
(import "GOT.mem" "imported_global" (global $gimport$4 i32))
but it turns out that this imports not a global that it reads from and writes
to, but rather a global that it takes a memory address from.
(This is not completely surprising; after all I might want to take the address,
&imported_global).
Is there a way to import, read and write a WebAssembly global from C code?
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