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IRBuilder is a utility for turning arbitrary valid streams of Wasm
instructions into valid Binaryen IR. It is already used in the text
parser, so now use it in the binary parser as well. Since the IRBuilder
API for building each intruction requires only the information that the
binary and text formats include as immediates to that instruction, the
parser is now much simpler than before. In particular, it does not need
to manage a stack of instructions to figure out what the children of
each expression should be; IRBuilder handles this instead.
There are some differences between the IR constructed by IRBuilder and
the IR the binary parser constructed before this change. Most
importantly, IRBuilder generates better multivalue code because it
avoids eagerly breaking up multivalue results into individual components
that might need to be immediately reassembled into a tuple. It also
parses try-delegate more correctly, allowing the delegate to target
arbitrary labels, not just other `try`s. There are also a couple
superficial differences in the generated label and scratch local names.
As part of this change, add support for recording binary source
locations in IRBuilder.
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Support 5-segment source mappings, which add a name.
Reference:
https://github.com/tc39/source-map/blob/main/source-map-rev3.md#proposed-format
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The whole annotation was parsed as a keyword, which prevented file paths with non-ascii characters or paths starting with `/` or `.`.
Also, there was a typo: one was comparing `fileSize` rather than `lineSize` to `contents->npos`.
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Helping #6509, this fixes debugging support for StackIR, which makes it more
possible to use StackIR in more places.
The fix is basically just to pass around some more state, and then to call the
parent with "please write debug info" at the correct times, mirroring the
similar calls in BinaryenIRWriter.
The relevant Emscripten tests pass, and the source map test modified
here produces identical output in StackIR and non-StackIR modes (the
test is also simplified to remove --new-wat-parser which is no longer
needed, after which the test can clearly show that StackIR has the same
output as BinaryenIR).
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The special block nesting logic also needs to handle emitting debug info.
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and fix a bug with sourcemap annotations on folded `if` conditions. Update
IRBuilder to apply prologue and epilogue source locations when beginning and ending
a function scope. Add basic support in the parser for explicitly tracking
annotations on module fields, although only do anything with them in the case of
prologue source location annotations.
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We previously supported (and primarily used) a non-standard text format for
conditionals in which the condition, if-true expression, and if-false expression
were all simply s-expression children of the `if` expression. The standard text
format, however, requires the use of `then` and `else` forms to introduce the
if-true and if-false arms of the conditional. Update the legacy text parser to
require the standard format and update all tests to match. Update the printer to
print the standard format as well.
The .wast and .wat test inputs were mechanically updated with this script:
https://gist.github.com/tlively/85ae7f01f92f772241ec994c840ccbb1
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With this, the sourcemap testcase outputs the exact same thing as the input.
Followup to #5504
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The stack logic was incorrect, and led to source locations being emitted
on parents instead of children.
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