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Introduce two new VM api functions uc_vm_gc_start() and uc_vm_gc_stop()
which allow starting and stopping automatic periodic garbage collection
of cyclic objects in the VM context.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The I_DYNLOAD opcode is basically a bytecode level instruction for
uc_require() with semantics similar to I_IMPORT. It allows loading
a dynamic extension library at runtime and treating values from the
resulting module context object like exports from a compile time source
module.
For example the statement `import { readfile, writefile } from "fs"`
would import the readfile() and writefile() functions of fs.so as
readonly live bindings into the current file scope.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Try to resolve the source offset to line and character position and only
fall back to report the location as instruction offset if we weren't able
to determine the line number.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Module function upvalues are patched through import operations, ensure to
leave them uninitialized when loading and executing the module constructor.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The upcoming compile-time module support will require the configured
extension search path in the compiler as well, so move it to the
already shared uc_parse_config_t structure and add the appropriate
utility functions to initialize, append and free the search path
vector.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Introduce new opcodes to realize module imports and exports. The export
operation will capture a local variable as upvalue and store it in VM
wide module export registry while the import operation will connect an
upvalue from the module export registry with a preallocated upvalue in
the running function scope.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Reject modifications on object and array values with a type exception when
the constant flag is set on the value operated upon.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Resolve upvalue references to their actual values when pushing such
references onto the stack (or when attempting to call them as method).
This allows constructing objects of pointers, as needed for wildcard
module imports.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Upcoming module support will rely on upresolved upvalues which are patched
at runtime to realize module imports, make sure the VM trace code does not
choke on such unresolved upvalues.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The upcoming module support requires maintaining multiple source objects
within the same program, so add the necessary infrastructure for it.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When a managed function is indirectly invoked during bytecode execution,
e.g. when calling the tostring() method of an object prototype during
string concatenation, the invoked function must stop executing bytecode
upon return to hand control back to caller.
Extend `uc_vm_execute_chunk()` to track the amount of nested function
calls it performs and hand back control to the caller once the toplevel
callframe returns. Also bubble unhandled exceptions only as far as up
to the original caller.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Move the invocation of the unhandled exception callback handler out of
`uc_vm_execute_chunk()` into both `uc_vm_execute()` and `uc_vm_invoke()`
in order to consistently report exceptions exactly once regardless of
whether a native or managed code function is executed as topmost VM
call.
This solves cases where the unhandled exception callback was either
called multiple times or never at all.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When invoking a native function as toplevel VM call which indirectly
triggers an unhandled exception in managed code, the callframes are
completely reset before the C function returns, leading to invalid
memory accesses when `uc_vm_call_native()` subsequently popped it's
own callframe again.
This issue did not surface by executing script code through the
interpreter since in this case the VM will always execute a managed
code as toplevel call, but it could be triggered by invoking a native
function triggering an exception through the C API using `uc_vm_call()`
on a fresh `uc_vm_t` context or by utilizing the CLI interpreters `-l`
flag to preload a native code library triggering an exception.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When executing an object literal declaration using non-string computed
property name values, the VM crashed caused by an attempt to use a NULL
pointer (result of ucv_string_get() on a non-string value) as hash table
key.
Fix this issue by using the `ucv_key_set()` infrastructure which deals
with the implicit stringification of non-string key values.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Support ES2016 exponentiation (**) and exponentiation assignment (**=)
- Support ES2020 nullish coalescing (??) and logical nullish assignment (??=)
- Support ES2021 logical and assignment (&&=) and logical or assignment (||=)
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When attempting to invoke a non-function value as method or when the the
internal recursion limit was exceeded, `uc_vm_call_function()` emitted
and internal runtime exception and freed the function value but not the
`this` context associated with the method call.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Instead of treating individual program functions as managed ucode types,
demote uc_function_t values to pointers into a uc_program_t entity
- Promote uc_program_t to a managed type
- Let uc_closure_t claim references to the owning program of the enclosed
uc_function_t
- Redefine public APIs uc_compile() and uc_vm_execute() APIs to return and
expect an uc_program_t object respectively
- Remove vallist indirection for function loading and let the compiler
emit the function id directly when producing function construction code
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Clang emits code which evaluates function call argument expressions in a
different order, causing `uc_dump_insn()` to receive the instruction pointer
address after decoding the instruction, not before.
Avoid that problem by explicitly caching the pre-decode address in a
temporary variable which is then passed to `uc_dump_insn()`.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The internal uc_vm_call_function() helper may fail in different ways before
the stack frame has been set up, e.g. if the provided function value was not
actually a callable function. In such cases an exception is raised but the
actual function value is leaked since there's not yet a stackframe referring
to it.
Solve the issue by freeing the function value explicitly in these exit cases.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Move source object pointer into program entity which is referenced by
each function
- Move lineinfo related routines into source.c and use them from lexer.c
since lineinfo encoding does not belong into the lexical analyzer.
- Implement initial infrastructure for detecting source file type,
this is required later to differentiate between plaintext and
precompiled bytecode files
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Instead of storing constant values per function, maintain a global program
wide list for all constant values within the current compilation unit.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Introduce a new "program" entity which holds the list of functions
created during compilation
- Instead of storing pointers to the in-memory function representation
in the constant list, store the index of the function within the
program's function list
- When loading functions from the constant list, retrieve the function
by index from the program entity
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When concatenating strings, avoid allocating three times the required
memory in the worst case. Instead of first allocating the string
representations of the operands followed by the memory for the final
string, allocate a string buffer and print the operands into it. This
will grow the target memory as needed and avoid redundant internal
copies of the involved strings.
Also handle the special where the final string fits into a tagged
pointer and deal with it accordingly.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Parse integer literals as unsigned numeric values in order to be able
to represent the entire unsigned 64bit value range
- Stop parsing minus-prefixed integer literals as negative numbers but
treat them as separate minus operator followed by a positive integer
instead
- Only store unsigned numeric constants in bytecode
- Rework numeric comparison logic to be able to handle full 64bit
unsigned integers
- If possible, yield unsigned 64 bit results for additions
- Simplify numeric value conversion API
- Compile code with -fwrapv for defined signed overflow semantics
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Introduce a new, lazily allocated value registry which can be used by C
code to store values which should not be garbage collected.
The registry is a plain ucode object internally and treated as GC root
but not exposed to ucode script code, this allows it to retain references
to values which are otherwise completely unreachable from ucode scripts.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Fix various misspelling of "resource".
This commit changes the exported libucode ABI.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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No functional changes.
Fixes: ff52440 ("treewide: consolidate typedef naming")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Allow querying object properties on resource values. A resource value may
have a prototype object set whose properties should be enumerable.
Support that use case in the VM.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Fix instances of misspelled "resource".
This commit breaks the exported libucode ABI.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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syntax: introduce optional chaining operators
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Introduce new operators `?.`, `?.[…]` and `?.(…)` to simplify looking up
deeply nested property chain in a secure manner.
The `?.` operator behaves like the `.` property access operator but yields
`null` if the left hand side is `null` or not an object.
Like `?.`, the `?.[…]` operator behaves like the `[…]` computed property
access but yields `null` if the left hand side is `null` or neither an
object or array.
Finally the `?.(…)` operator behaves like the function call operator `(…)`
but yields `null` if the left hand side is `null` or not a callable
function.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Reset all callframes when dealing with an unhandled exception to avoid
resuming the code which raised the exception when restarting the VM
later, e.g. through uc_vm_call() or uc_vm_invoke().
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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If execution in an existing VM that threw an exception was resumed
through uc_vm_call() or uc_vm_invoke(), the exception was never cleared,
causing all subsequent calls to return with an exception status as well.
Ensure that any preexisting exception information is discarded before
executing the requested function in order to start from a clean state.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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In success case, always push the function return value onto the stack even
if no call frames are remaining after the function returned.
This is needed for host program code invoking ucode functions within a VM
context that already ran to completion.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Ensure that most functions follow the subject_verb naming schema
- Move type related function from value.c to types.c
- Rename value.c to vallist.c
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Provide separate public ucv_gc() and ucv_freeall() functions to perform
an incremental and complete GC run respectively.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Ensure that all custom typedef and vector declaration type names end with
a "_t" suffix.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Add a public getter and setter to read and set the VM trace level
respectively. Use the new API to control the trace mode with a newly
introduced `-t` command line switch.
Drop support for honouring the `TRACE` environment variable as
host programs embedding ucode might want to prevent that behaviour
or handle it differently.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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So far, the VM simply printed exception information to stderr if the
exception was not catched in managed code. Host programs embedding
ucode might want to customize that behaviour, so refactor the current
defualt behaviour into a callback function and add a public getter
and setter to allow changing the exception handler callback.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When a function is invoked directly, e.g. through uc_vm_invoke(), the call
stack is empty, so avoid accessing the first call frame unless we actually
need to, which is only the case if the function is invoked with spread args
which can only happen with calls from manged code.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When a toplevel function call raises an exception, the call stack will be
empty when invoking the exception handler, ensure to handle this case
appropriately.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Instead of invoking exit(3) from uc_exit(), use a new EXCEPTION_EXIT
exception type to instruct the VM to shutdown cleanly.
This is required to not terminate the host program in case libucode
is embedded and loaded scripts invoke the exit() function.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The uc_vm_invoke() function simplifies calling a named ucode function with
arbitrary arguments.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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