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Each pass instance can now store an argument for it, which can be different.
This may be a breaking change for the corner case of running a pass multiple
times and setting the pass's argument multiple times as well (before, the last
pass argument affected them all; now, it affects the last instance only). This
only affects arguments with the name of a pass; others remain global, as
before (and multiple passes can read them, in fact). See the CHANGELOG for
details.
Fixes #6646
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Previously only WalkerPasses had access to the `getPassRunner` and
`getPassOptions` methods. Move those methods to `Pass` so all passes can use
them. As a result, the `PassRunner` passed to `Pass::run` and
`Pass::runOnFunction` is no longer necessary, so remove it.
Also update `Pass::create` to return a unique_ptr, which is more efficient than
having it return a raw pointer only to have the `PassRunner` wrap that raw
pointer in a `unique_ptr`.
Delete the unused template `PassRunner::getLast()`, which looks like it was
intended to enable retrieving previous analyses and has been in the code base
since 2015 but is not implemented anywhere.
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Imported functions come first when modules are emitted, so to ensure the
function indices are correct, they need to come first in the symbol maps. We
never noticed this bug before because imported functions are always the first
functions when a module is parsed, so the bug never mattered in practice.
However, wasm-split adds new imported functions after parsing and these were
causing the symbol map indices to be incorrect.
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wasm-as supports --symbolmap=FOO as an argument. We got a request to
support the same in wasm-opt. wasm-opt does have --print-function-map which
does the same, but as a pass. To unify them, use the new pass arg sugar from
#3882 which allows us to add a --symbolmap pass whose argument can be
set as --symbolmap=FOO. That perfectly matches the wasm-as notation.
For now, keep the old --print-function-map notation as well, to not break
emscripten. After we remove it there we can remove it here.
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* work
* fix
* fix
* format
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