Multi-Memories Lowering Pass (#5107)

Adds a multi-memories lowering pass that will create a single combined memory from the memories added to the module. This pass assumes that each memory is configured the same (type, shared).

This pass also:

- replaces existing memory.size instructions with a custom function that returns the size of each memory as if they existed independently
- replaces existing memory.grow instructions with a custom function, using global offsets to track the page size of each memory so data doesn't overlap in the singled combined memory
- adjusts the offsets of active data segments
- adjusts the offsets of Loads/Stores

1 files changed, 3 insertions, 0 deletions

diff --git a/src/passes/pass.cpp b/src/passes/pass.cpp
index ae9f34584..c6d94ddf7 100644
--- a/src/passes/pass.cpp
+++ b/src/passes/pass.cpp
@@ -272,6 +272,9 @@ void PassRegistry::registerPasses() {
   registerPass("mod-asyncify-never-unwind",
                "apply the assumption that asyncify never unwinds",
                createModAsyncifyNeverUnwindPass);
+  registerPass("multi-memory-lowering",
+               "combines multiple memories into a single memory",
+               createMultiMemoryLoweringPass);
   registerPass("nm", "name list", createNameListPass);
   registerPass("name-types", "(re)name all heap types", createNameTypesPass);
   registerPass("once-reduction",