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error may be in a global init
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(#1017)
* Extends wasm-as, wasm-dis and s2wasm to consume debug locations.
* Exports source map from asm2wasm
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* refactor optimization opts helper code to a class
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* validate that memory/table segment values fit in the initial range
* validate that select condition should be i32
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before and after optimizations are run, checking for changes. this can be used when fuzzing
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* values cannot flow through an if without an else, they never return a value
* check pass tests in pass-debug mode too
* add missing finalization in binary reading
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* address review feedback for #1014
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* validate that types are properly finalized, when in pass-debug mode (BINARYEN_PASS_DEBUG env var): check after each pass is run that the type of each node is equal to the proper type (when finalizing it, i.e., fully recomputing the type).
* fix many fuzz bugs found by that.
* in particular, fix dce bugs with type changes not being fully updated during code removal. add a new TypeUpdater helper class that lets a pass update types efficiently, by the helper tracking deps between blocks and branches etc., and updating/propagating type changes only as necessary.
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This adds a pass that converts to a CFG, runs the relooper, and re-generates wasm from that. This depends on flatten-control-flow being run before.
The main goal here is to help code generators other than asm2wasm (which already receives relooped code from fastcomp).
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* parallelize istring creation, by having a thread-local set and a global set guarded by a mutex. each time a new string shows up in a thread, it will be added to that thread's set, after accessing the global set through the lock first, which means we lock at most once per new string per thread
* don't leak strings in istring store
* since we now create names in a parallel thread-safe manner, we don't need to pre-create names in RelooperJumpThreading
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unnecessary complexity in that pass as well
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This pass flattens out control flow in order to achieve 2 properties:
* Control flow structures (block, loop, if) and control flow operations (br, br_if, br_table, return, unreachable) may only be block children, a loop body, or an if-true or if-false. (I.e., they cannot be nested inside an i32.add, a drop, a call, an if-condition, etc.)
* Disallow block, loop, and if return values, i.e., do not use control flow to pass around values.
As a result, expressions cannot contain control flow, and overall control flow is simpler, more structured, and more "flat".
This should make things like re-relooping wasm code much easier, as they can run after the cfg is flattened
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happen, and autoDrop wasn't handling it (#1005)
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* fix type of drop, set_local, set_global, load, etc: when operand is unreachable, so is the node itself
* support binary tests properly in test/passes
* fix unreachable typing of blocks with no name and an unreachable child
* fix continue emitting in asm2wasm
* properly handle emitting of unreachable load
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but does not properly modify the type (#1000)
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* fix wasm-ctor-eval, we need to look for the STACKTOP etc. imports, they may not be named, if this build is not with -g
* pack memory after ctor evalling, since we merge it up which is less efficient
* do some useful opts after ctor-evalling, to clean things up
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being named, and colliding with others' original names (#994)
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binary with either side unreachable - then they are unreachable. this makes our usage of the unreachable type consistent
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the transformation, as the outside might care about that
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contents. make s2wasm avoid outputting that as well (#992)
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* improve dce to handle more cases of nested unreachable code, in particular, when the child is unreachable in type but not an actual Unreachable node, e.g. if it's a br. in that case, we just need to verify that the br is not to us where we are a block or loop
* handle unreachable switch conditions in dce
* handle dce of br condition which is unreachable, and host arguments
* handle dce of block i32 etc. which is actually unreachable
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* properly validate block endings
* blocks with a value must not have a last element that is none
* fully validate input types to binary expressions
* validate i32.eqz/i64.eqz more carefully
* if condition must be i32
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