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78 commits

Author SHA1 Message Date
Ali Mohammad Pur
06ffc0c4db LibWasm: Don't create useless temporary strings for trap reasons 
These strings are only used when execution traps, so there's no reason
to create actual strings until that happens; instead switch to using
StringViews.
 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
2fc0040ceb LibWasm: Tweak the implementation-defined limits a bit 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
5636f8143d LibWasm: Allow overflow in normal 64-bit arithmetic instructions 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
c4d4c657d0 LibWasm: Limit module memory to 65536 pages 
The spec mentions this, and anything past that can't be correctly
addressed by the 32-bit indices anyhow.
 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
03fe50d5e7 LibWasm: Fix data section initialization bounds checking 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
d2212a1f51 LibWasm: Jump to the default label in br_table with negative values 
Also adds a forgotten Wasm::Printer implementation for printing table
branch arguments.
 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
0b08392e54 LibWasm: Use the number of bytes when comparing memory limits 
...instead of comparing page count with byte count.
 2021-07-06 17:55:00 +04:30
Ali Mohammad Pur
4bdb0ad132 LibWasm: Guard stack accesses with checks 
If the stack is empty, let's just trap.
 2021-07-06 17:55:00 +04:30
Idan Horowitz
301c1a3a58 Everywhere: Fix incorrect usages of AK::Checked 
Specifically, explicitly specify the checked type, use the resulting
value instead of doing the same calculation twice, and break down
calculations to discrete operations to ensure no intermediary overflows
are missed.
 2021-07-04 20:08:28 +01:00
Ali Mohammad Pur
b538e15548 LibWasm: Give traps a reason and display it when needed 
This makes debugging wasm code a bit easier, as we now know what fails
instead of just "too bad, something went wrong".
 2021-07-02 04:53:01 +04:30
Andreas Kling
beb43f673e AK: Undo bogus Variant::downcast() rename 
I accidentally renamed these to verify_cast() when doing the global
AK::downcast() rename.
 2021-06-26 21:27:58 +02:00
Andreas Kling
ee3a73ddbb AK: Rename downcast<T> => verify_cast<T> 
This makes it much clearer what this cast actually does: it will
VERIFY that the thing we're casting is a T (using is<T>()).
 2021-06-24 19:57:01 +02:00
Ali Mohammad Pur
c4b82ace74 LibWasm: Limit the call stack depth and the number of executed insts 
These limits are described in the spec, and we're supposed to stop
execution at some point.
The limits are arbitrarily chosen.
 2021-06-22 00:26:25 +04:30
Ali Mohammad Pur
9971d13844 LibWasm: Trap if a non-Value is used as a Value 
Otherwise we'd just crash, which is not a good thing
 2021-06-22 00:26:25 +04:30
Ali Mohammad Pur
9c5d38b7db Meta+LibWasm: Add support for module linking tests 
This commit makes the linking tests in the wasm spec test run.
 2021-06-22 00:26:25 +04:30
Linus Groh
34b338702a LibWasm: Remove empty AbstractMachine/Interpreter.cpp 
This was moved to BytecodeInterpreter.cpp, so this is unused now.
 2021-06-20 01:49:56 +01:00
Andreas Kling
dc65f54c06 AK: Rename Vector::append(Vector) => Vector::extend(Vector) 
Let's make it a bit more clear when we're appending the elements from
one vector to the end of another vector.
 2021-06-12 13:24:45 +02:00
Ali Mohammad Pur
aa2916c21b LibWasm: ALWAYS_INLINE some very hot functions 
These function couldn't be inlined before because the compiler would've
started flagging invalid paths in Variant as maybe-uninitialized.
 2021-06-09 23:05:32 +04:30
Ali Mohammad Pur
45710d0724 LibWasm: Implement saturating float truncation instructions 
With these, the only remaining unimplemented instructions are the
following:
- memory.init
- data.drop
- memory.copy
- memory.fill
- table.init
- elem.drop
- table.copy
- table.grow
- table.size
- table.fill
 2021-06-09 23:05:32 +04:30
Ali Mohammad Pur
3a44011cd4 LibWasm: Implement sign extension instructions 2021-06-09 23:05:32 +04:30
Ali Mohammad Pur
a4c4dd928b LibWasm: Implement spec-compliant float min/max ops 2021-06-09 23:05:32 +04:30
Sahan Fernando
d02e7b3811 LibWasm: Move Wasm::BytecodeInterpreter into its own header 2021-06-05 14:31:54 +04:30
Ali Mohammad Pur
1b083392fa LibWasm+wasm: Switch to east-const to comply with project style 
Against my better judgement, this change is mandated by the project code
style rules, even if it's not actually enforced.
 2021-06-04 16:07:42 +04:30
Ali Mohammad Pur
be62e4d1d7 LibWasm: Load and instantiate tables 
This commit is a fairly large refactor, mainly because it unified the
two different ways that existed to represent references.
Now Reference values are also a kind of value.
It also implements a printer for values/references instead of copying
the implementation everywhere.
 2021-06-04 16:07:42 +04:30
Ali Mohammad Pur
c392a0cf7f LibWasm: Implement the br.table instruction 
Unlike its name, this instruction has nothing to do with tables, it's
just a very simple switch-case instruction.
 2021-06-04 16:07:42 +04:30
Ali Mohammad Pur
9db418e1fb LibWasm: Read from and write to memory as little-endian 
The spec says so, we must do so.
 2021-06-04 16:07:42 +04:30
BrandonKi
0d1481be7d LibWasm: Use builtins for clz, ctz, and popcnt 2021-06-03 03:45:06 +04:30
BrandonKi
e53df2ca9d LibWasm: Implement rotr and rotl 2021-06-03 03:45:06 +04:30
Ali Mohammad Pur
ea7ba34a31 AK+LibWasm+LibJS: Disallow Variant.has() on types that aren't contained 
Checking for this (and get()'ing it) is always invalid, so let's just
disallow it.
This also finds two bugs where the code is checking for types that can
never actually be in the variant (which was actually a refactor
artifact).
 2021-06-02 18:02:47 +02:00
Ali Mohammad Pur
b15a5d6ada LibWasm: Ensure that value signs are preserved when casting 
Also makes normal arithmetic operations more spec-compliant by actually
ignoring overflow on them.
 2021-06-02 16:09:16 +04:30
Ali Mohammad Pur
02b3238c41 LibWasm: Parse the "extend" set of instructions 2021-06-02 16:09:16 +04:30
Ali Mohammad Pur
9a1853c388 LibWasm: Don't execute the last instruction in the frame after return 2021-06-02 16:09:16 +04:30
Ali Mohammad Pur
b250a6ae7e wasm: Add a way to create dummy function exports 
This should allow running modules with their imports stubbed out
in wasm, to debug them.
 2021-06-02 16:09:16 +04:30
Ali Mohammad Pur
56bf80251c LibWasm: Implement reference instructions (ref.{null,func,is_null}) 2021-06-02 16:09:16 +04:30
Gunnar Beutner
5f18cf75c5 AK: Replace ByteBuffer::grow with resize()/ensure_capacity() 
Previously ByteBuffer::grow() behaved like Vector<T>::resize().
However the function name was somewhat ambiguous - and so this patch
updates ByteBuffer to behave more like Vector<T> by replacing grow()
with resize() and adding an ensure_capacity() method.

This also lets the user change the buffer's capacity without affecting
the size which was not previously possible.

Additionally this patch makes the capacity() method public (again).
 2021-05-31 14:49:00 +04:30
Ali Mohammad Pur
e0b17988bd LibWasm: Make f32-add/sub actually perform addition/subtraction 
Instead of applying a unary operator to the ToS.
This alone fixes 4% of the spec test issues.
 2021-05-30 01:34:28 +04:30
Ali Mohammad Pur
08b567e137 LibWasm: Avoid OOB accesses caused by user input 
Just trap instead of crashing.
 2021-05-30 01:34:28 +04:30
Ali Mohammad Pur
8ce015742d LibWasm: Fix logic error in Limits::parse() 
The check was negated, and it errored out when the read actually
succeeded.
 2021-05-29 23:03:18 +04:30
Ali Mohammad Pur
578bf6c45e LibWasm: Avoid excessive pop()-then-push() on the stack 
Also make the stack a lot bigger, since we now have only one of these
instead of one per function call.
 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
477ab6dc4c LibWasm: Let the interpreter itself manage the call frame 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
85794f8244 LibWasm: Add a copy assignment operator to Value 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
c5df55a8a2 LibWasm: Make Interpreter a virtual interface 
This allows multiply different kinds of interpreters to be used by the
runtime; currently a BytecodeInterpreter and a
DebuggerBytecodeInterpreter is provided.
 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
f91fa79fc5 LibWasm: Use the current configuration to run call ops 
This should make it easier to implement multiple types of interpreters
on top of a configuration, and also give a small speed boost in not
initialising as many Stack objects.
 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
bc936a5fac LibWasm: Make Frame a value type as well 
This means stack operations will no longer do extra allocations.
 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
73eb0785e0 LibWasm: Don't put values and labels in OwnPtrs 
Doing that was causing a lot of malloc/free traffic, but since there's
no need to have a stable pointer to them, we can just store them by
value.
This makes execution significantly faster :^)
 2021-05-27 17:28:41 +04:30
Ali Mohammad Pur
ba5da79617 LibWasm: Add execution hooks and a debugger mode to the wasm tool 
This is useful for debugging *our* implementation of wasm :P
 2021-05-26 15:34:13 +04:30
Ali Mohammad Pur
800bcb9965 LibWasm: Drop previous frame when a structured end instruction is run 2021-05-26 15:34:13 +04:30
Ali Mohammad Pur
7966168fea LibWasm: Turn memory read failures into traps 2021-05-26 15:34:13 +04:30
Ali Mohammad Pur
c31a4e9013 LibWasm: Once more fix structured instruction label indices 
This finally works correctly. ™️
 2021-05-26 15:34:13 +04:30
Ali Mohammad Pur
d05e5dbdcf LibWasm: Drop the correct number of frames 
Prior to this commit, we would be dropping an extra frame.
 2021-05-26 15:34:13 +04:30