aot_load_const_from_table() hides the const-ness of the
value and prevents optimizations like
https://github.com/bytecodealliance/wasm-micro-runtime/pull/3552.
This commit makes the aot compiler tracks the const-ness
of the value directly in the AOTValue and enables the above
mentioned optimization for XIP.
* I believe that LLVM MemoryBuffer interface is supposed to be read-only
and it's allowed to use eg. read-only mmap of the underlying file.
It isn't appropriate to modify the view at all.
* in case of WASM_ENABLE_DEBUG_AOT, the whole buffer is written as the text
section of the aot file. the modified e_type would confuse dwarf consumers.
note that, even when we are using XIP, the debug info usually contains
relocations. for example, llvm-dwarfdump doesn't seem to perform relocations
on .debug_info section for ET_CORE (== 4 == our E_TYPE_XIP) objects.
Consider the following wasm module:
```wast
(module
(func (export "foo")
i32.const 0x104
i32.const 0x12345678
i32.store
)
(memory 1 1)
)
```
While the address (0x104) is perfectly aligned for i32.store,
as our aot compiler uses 1-byte alignment for load/store LLVM
IR instructions, it often produces inefficient machine code,
especially for alignment-sensitive targets.
For example, the above "foo" function is compiled into the
following xtensa machine code.
```
0000002c <aot_func_internal#0>:
2c: 004136 entry a1, 32
2f: 07a182 movi a8, 0x107
32: 828a add.n a8, a2, a8
34: 291c movi.n a9, 18
36: 004892 s8i a9, a8, 0
39: 06a182 movi a8, 0x106
3c: 828a add.n a8, a2, a8
3e: ffff91 l32r a9, 3c <aot_func_internal#0+0x10> (ff91828a <aot_func_internal#0+0xff91825e>)
3e: R_XTENSA_SLOT0_OP .literal+0x8
41: 004892 s8i a9, a8, 0
44: 05a182 movi a8, 0x105
47: 828a add.n a8, a2, a8
49: ffff91 l32r a9, 48 <aot_func_internal#0+0x1c> (ffff9182 <aot_func_internal#0+0xffff9156>)
49: R_XTENSA_SLOT0_OP .literal+0xc
4c: 41a890 srli a10, a9, 8
4f: 0048a2 s8i a10, a8, 0
52: 04a182 movi a8, 0x104
55: 828a add.n a8, a2, a8
57: 004892 s8i a9, a8, 0
5a: f01d retw.n
```
Note that the each four bytes are stored separately using
one-byte-store instruction, s8i.
This commit tries to use larger alignments for load/store LLVM IR
instructions when possible. with this commit, the above example is
compiled into the following machine code, which seems more reasonable.
```
0000002c <aot_func_internal#0>:
2c: 004136 entry a1, 32
2f: ffff81 l32r a8, 2c <aot_func_internal#0> (81004136 <aot_func_internal#0+0x8100410a>)
2f: R_XTENSA_SLOT0_OP .literal+0x8
32: 416282 s32i a8, a2, 0x104
35: f01d retw.n
```
Note: this doesn't work well for --xip because aot_load_const_from_table()
hides the constness of the value. Maybe we need our own mechanism to
propagate the constness and the value.
Probably it's better to skip the optimized out parameters.
(that is, parameters w/o locations)
However, I'm not sure how/if it can be done with the lldb api.
For now, just disable parameter processing to avoid crashes.
While band-aid fixes like this is not plausible IMO,
some people prefer to have some debug info even if it's
partial/limited/broken. This commit partially (re)enables
C++ processing. On the other hand, do not bother to process
variables because it's known incompatible with C++.
Although I don't know what exactly the esp32s3 rom version of memset is,
it seems that the current code crashes only with a small "len". I guess
it changes the logic depending on the size.
Anyway, it's safer to use dbus here.
- Add a few API (https://github.com/bytecodealliance/wasm-micro-runtime/issues/3325)
```c
wasm_runtime_detect_native_stack_overflow_size
wasm_runtime_detect_native_stack_overflow
```
- Adapt the runtime to use them
- Adapt samples/native-stack-overflow to use them
- Add a few missing overflow checks in the interpreters
- Build and run the sample on the CI
The old value (1KB) doesn't seem sufficient for many cases.
I suspect that the new value is still not sufficient for some cases.
But it's far safer than the old value.
Consider if the classic interpreter loop (2600 bytes) calls
host snprintf. (2000 bytes)
Fixes: https://github.com/bytecodealliance/wasm-micro-runtime/issues/3314
This reverts commit 0e8d949440.
Because it doesn't make much sense anymore after we disabled debug info
processing on C++ functions in:
"aot debug: process lldb_function_to_function_dbi only for C".
This increases the chance to use "short" calls.
Assumptions:
- LLVM preserves the order of functions in a module
- The wrapper function are smaller than the wrapped functions
- The target CPU has "short" PC-relative variation of call/jmp instructions
and they are preferrable over the "long" ones.
A motivation:
- To avoid some relocations for XIP, I want to use xtensa PC-relative
call instructions, which can only reach ~512KB.
While we used a different approach for poll_oneoff [1],
the implementation works only when the poll list includes
an absolute clock event. That is, if we have a thread which is
polling on descriptors without a timeout, we fail to terminate
the thread.
This commit fixes it by applying wasm_runtime_begin_blocking_op
to poll as well.
[1] https://github.com/bytecodealliance/wasm-micro-runtime/pull/1951
Possible alternatives:
* Make wasm_cluster_destroy_spawned_exec_env take two exec_env.
One for wasm execution and another to specify the target to destroy.
* Make execute functions to switch exec_env as briefly discussed in
https://github.com/bytecodealliance/wasm-micro-runtime/pull/2047
It seems that some users want to wrap rather large chunk of code
with wasm_runtime_begin_blocking_op/wasm_runtime_end_blocking_op.
If the wrapped code happens to have a call to
e.g. wasm_runtime_spawn_exec_env, WASM_SUSPEND_FLAG_BLOCKING is
inherited to the child exec_env and it may cause unexpected behaviors.
When the original wasm contains multiple compilation units, the current
logic uses the first one for everything. This commit tries to use a bit more
appropriate ones.
On macOS, by default, the first 4GB is occupied by the pagezero.
While it can be controlled with link time options, as we are
an library, we usually don't have a control on how to link an
executable.
* Empty names are spec-wise valid.
* As we ignore unknown custom sections anyway, it's safe to
accept empty names here.
* Currently, the problem is not exposed on our CI because
the wabt version used there is a bit old.
Currently, `data.drop` instruction is implemented by directly modifying the
underlying module. It breaks use cases where you have multiple instances
sharing a single loaded module. `elem.drop` has the same problem too.
This PR fixes the issue by keeping track of which data/elem segments have
been dropped by using bitmaps for each module instances separately, and
add a sample to demonstrate the issue and make the CI run it.
Also add a missing check of dropped elements to the fast-jit `table.init`.
Fixes: https://github.com/bytecodealliance/wasm-micro-runtime/issues/2735
Fixes: https://github.com/bytecodealliance/wasm-micro-runtime/issues/2772
On posix-like platforms, the rest of wasi-threads tests
should pass after the recent changes including the following PRs:
#2516, #2524, #2529, #2571, #2576 and #2582.
Send a signal whose handler is no-op to a blocking thread to wake up
the blocking syscall with either EINTR equivalent or partial success.
Unlike the approach taken in the `dev/interrupt_block_insn` branch (that is,
signal + longjmp similarly to `OS_ENABLE_HW_BOUND_CHECK`), this PR
does not use longjmp because:
* longjmp from signal handler doesn't work on nuttx
refer to https://github.com/apache/nuttx/issues/10326
* the singal+longjmp approach may be too difficult for average programmers
who might implement host functions to deal with
See also https://github.com/bytecodealliance/wasm-micro-runtime/issues/1910
Add API wasm_runtime_terminate to terminate a module instance
by setting "terminated by user" exception to the module instance.
And update the product-mini of posix platforms.
Note: this doesn't work for some situations like blocking system calls.
Preserve errno because this function is often used like
the following. The caller wants to report the error from the main
operation (`lseek` in this example), not from fd_object_release.
```
off_t ret = lseek(fd_number(fo), offset, nwhence);
fd_object_release(fo);
if (ret < 0)
return convert_errno(errno);
```
This fixes a few test cases in wasi-threads testsuite like wasi_threads_return_main_block.
And also move the special handling for "wasi proc exit" to a more appropriate place.
Introduce module instance context APIs which can set one or more contexts created
by the embedder for a wasm module instance:
```C
wasm_runtime_create_context_key
wasm_runtime_destroy_context_key
wasm_runtime_set_context
wasm_runtime_set_context_spread
wasm_runtime_get_context
```
And make libc-wasi use it and set wasi context as the first context bound to the wasm
module instance.
Also add samples.
Refer to https://github.com/bytecodealliance/wasm-micro-runtime/issues/2460.
While wasi proc exit is not a real trap, what the runtime does on it is mostly same as
real traps. That is, kill the siblings threads and represent the exit/trap as the result of
the "process" to the user api. There seems no reason to distinguish it from real traps
here.
Note that:
- The target thread either doesn't care the specific exception type or ignore wasi
proc exit by themselves. (clear_wasi_proc_exit_exception)
- clear_wasi_proc_exit_exception only clears local exception.
