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Convert PIC code generated by llvm to work with the current emscripten
ABI for dynamic linking:
- Convert mutable global imports from GOT.mem and GOT.func into
internal globals.
- Initialize these globals on started up in g$foo and f$foo imported functions
to calculate addresses at runtime.
Also:
- Add a test case for linking and finalizing a shared library
- Allow __stack_pointer global to be non-existent as can be case for
a shared library.
- Allow __stack_pointer global to be an import, as can be the case for
a shared library.
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- Move auto_update_tests.py code into respective scripts
- Use shared argument parsing in generate_lld_tests.py
- Use wasm-ld rather than passing -flavor
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We now implement addFunction by creating a wasm module to wrap
that JS function and simply adding it to the table.
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This takes advantage of the recent memory simplification in emscripten, where JS static allocation is done at compile time. That means we know the stack's initial location at compile time, and can apply it. This is the binaryen side of that:
* asm2wasm support for asm.js globals with an initial value var X = Y; where Y is not 0 (which is what the stack now is).
* wasm-emscripten-finalize support for a flag --initial-stack-pointer=X, and remove the old code to import the stack's initial location.
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This writes the data section into a file suitable for use with emscripten's
--memory-init-file flag
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Remove executable bit and #! from scripts that don't have
entry point.
Add missing licence test.
Move arg parsing into a function.
Remove legacy --only_prepare (with underscrore) argument.
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Failing test cases often start out with:
```
incorrect output, diff:
--- expected
+++ actual
```
which makes it difficult to figure out where the expected output might
live. That information can be derived from examining the tests, of
course, but it'd be much nicer if it were provided in the diff to see
straightaway.
We do this by introducing a new check, one which takes a filename of
expected output, which then enables us to display the failing file,
e.g.:
```
incorrect output, diff:
--- /home/froydnj/src/binaryen.git/test/passes/code-folding.txt
+++ actual
```
which is arguably nicer. Having this new check also enables reducing
some boilerplate `open(...).read()` calls in various places.
There are still a few places using `fail_if_not_identical`, usually
because `.strip()` is used on the expected output.
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* wasm-link-metadata: Use `__data_end` symbol.
* Add --global-base param to emscripten-wasm-finalize to compute staticBump properly
* Let ModuleWriter write to a provided Output object
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This adds necessary command line options for addFunction support, and generates required jsCall imports and generates jsCall thunk functions.
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* Skeleton of a beginning of o2wasm, WIP and probably not going to be used
* Get building post-cherry-pick
* ast->ir, remove commented out code, include a debug module print because linking
* Read linking section, print emscripten metadata json
* WasmBinaryWriter emits user sections on Module
* Remove debugging prints, everything that isn't needed to build metadata
* Rename o2wasm to lld-metadata
* lld-metadata support for outputting to file
* Use tables index instead of function index for initializer functions
* Add lld-emscripten tool to add emscripten-runtime functions to wasm modules (built with lld)
* Handle EM_ASM in lld-emscripten
* Add a list of functions to forcibly export (for initializer functions)
* Disable incorrect initializer function reading
* Add error printing when parsing .o files in lld-metadata
* Remove ';; METADATA: ' prefix from lld-metadata, output is now standalone json
* Support em_asm consts that aren't at the start of a segment
* Initial test framework for lld-metadata tool
* Add em_asm test
* Add support for WASM_INIT_FUNCS in the linking section
* Remove reloc section parsing because it's unused
* lld-emscripten can read and write text
* Add test harness for lld-emscripten
* Export all functions for now
* Add missing lld test output
* Add support for reading object files differently
Only difference so far is in importing mutable globals being an object
file representation for symbols, but invalid wasm.
* Update help strings
* Update linking tests for stackAlloc fix
* Rename lld-emscripten,lld-metadata to wasm-emscripten-finalize,wasm-link-metadata
* Add help text to header comments
* auto& instead of auto &
* Extract LinkType to abi/wasm-object.h
* Remove special handling for wasm object file reading, allow mutable globals
* Add braces around default switch case
* Fix flake8 errors
* Handle generating dyncall thunks for imports as well
* Use explicit bool for stackPointerGlobal
* Use glob patterns for lld file iteration
* Use __wasm_call_ctors for all initializer functions
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