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This commit introduces variable assignment making it possible to
change a variable value. Example:
myvar: i32 = 1;
myvar = 2;
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlos@maniero.me>
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The only way to get the next token was by consuming it. So then, our
parser starts to become hard to understand, once sometimes we just
want to take a look on the next token to understand what should be the
next kind of expression.
This commit introduces a new function that will help us to improve our
parser implementation.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Reviewed-by: Carlos Maniero <carlos@maniero.me>
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This patch adds the variable compilation and uses a scope (a stack of
map) to lookup for identities.
Today we use a vector + ref_entry structs in order to achieve the scope
implementation. The ref_entry lacks memory management, we are still no
sure who will be the owner of the pointer.
We also want to replace the scope a hashtable_t type as soon as we get
one.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>
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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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We are parsing variables/functions and checking if they are defined on
scope. Otherwise we fail the parsing with a nice message.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>
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Prior to this change, ast_variable_declaration_t and
ast_function_declaration_t used a string_view as an identifier. However,
to support scoped identifiers, it is more appropriate to use an
ast_identifier_t as a reference.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Co-authored-by: Johnny Richard <johnny@johnnyrichard.com>
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Before accepting an identifier, the parser should check if that
identifier will be available. With this implementation it will be
possible. Take the following code example:
main(): i32 {
return my_exit_code;
}
The parser must return an error informing that *my_exit_code* is not
defined in the example above. The ast scope is a support module for
parser and ast, simplifying identifier resolution.
Once a curly bracket ({) is open the *scope_enter()* is called and when
it is closed (}) we pop the entire stack with *scope_leave()*.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
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The AST was using a string view to distinguish the operation kind. An
enum was created for this purpose simplifying code generation.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichar.com>
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The +, -, *, and / tokens used to be TOKEN_OP, but the TOKEN_OP has been
removed and a token for each operation has been introduced. Python's
token names were followed: https://docs.python.org/3/library/token.html
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichar.com>
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We want to keep the code style consistent, this first commit adds a
.clang-format in order to "document" our style code.
This patch also adds a target *linter* to Makefile which will complain
if we have any style issue on test and src dirs.
I have run the follow command to create the .clang-format file:
$ clang-format -style=mozilla -dump-config > .clang-format
And I also made some adjusts to .clang-format changing the following
properties:
PointerAlignment: Right
ColumnLimit: 120
Commands executed to fix the current styling:
$ find . -name *.h | xargs clang-format -i
$ find . -name *.c | xargs clang-format -i
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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This commit adds support for variables and identifiers in the function
body of the parser, stored as a vector.
However, at this point, identifier resolution is not fully implemented,
and we currently accept identifiers without checking if they can be
resolved. This is a known limitation that will be addressed in a future
commit once hash-tables are added to the parser.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
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This commit introduces a full-featured CLI that allows you to compile a
file, set the gas and linker path, and define the executable output.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
Link: https://lists.sr.ht/~johnnyrichard/pipalang-devel/patches/40642
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Previously, we lacked a dynamic array for storing children elements in
our abstract syntax tree (AST). This commit introduces a new
implementation that dynamically adjusts its capacity as elements are
added, using a doubling strategy.
I considered two approaches for managing the vector's memory
allocation: allocating it on the heap, or providing a vector_init
function that allocates only the items array. Ultimately, I decided to
provide a vector_new function for instantiating the vector, as this
aligns with the expected usage pattern when there is a destroy function.
With this new implementation, we can efficiently store and manage AST
children, enabling more flexible and expressive tree structures.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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We decided for using push and pop to simplify the implementation, we
want to revisit the approach latter.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Co-authored-by: Johnny Richard <johnny@johnnyrichard.com>
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This patch implements the AST creation for arithmetic expressions.
NOTE:
The implementation works only for integer numbers.
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Reviewed-by: Carlos Maniero <carlosmaniero@gmail.com>
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Since we want to extend our code to support multiple kind of expression
it does not make sense that the return statement always return a number.
For now on, return statement has an ast_node_t as argument, meaning that
it could be anything. The literal_node_t was also implemented in order
to keep the application behavior.
Following the C's calling convention the literal values are stored at
%eax and the return takes this argument to do anything it is needed.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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This tests perform the whole cycle. It takes the output from pipac
compile, execute and check the returned status code.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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Previously, when an error occurred during parsing, the application
would exit, making it difficult to test the parser and limiting the
compiler's extensibility. This commit improves the parser's error
handling by allowing for continued execution after an error, enabling
easier testing and increased flexibility.
The parser is prepared to handle multiples errors, although the
current implementation always returns a single error, it may be
useful given multiples functions where we can show errors by context.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviwed-by: Johnny Richard <johnny@johnnyrichard.com>
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Previously, the abstract syntax tree (AST) used static types, meaning
that an ast_function_t would always have a ast_return_stmt_t as
its body. However, this assumption is not always true, as we may have
void functions that do not have a return statement. Additionally, the
ast_return_stmt_t always had a number associated with it, but this too
is not always the case.
To make this possible, I need to perform a few changes in the whole
project. One of the main changes is that there is no longer the
inheritance hack. That mechanism was replaced by composition and
pointers where required for recursive type reference.
It is important to mention that I decided to use union type to implement
the composition. There is two main advantages in this approach:
1. There is only one function to allocate memory for all kind of nodes.
2. There is no need to cast the data.
In summary, this commit introduces changes to support dynamic typing
in the AST, by replacing the inheritance hack with composition and
using union types to simplify memory allocation and type casting.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
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With this function now it is possible to assert a token
given an index.
Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
Link: https://lists.sr.ht/~johnnyrichard/pipalang-devel/%3C20230418170136.3949-1-carlosmaniero%40gmail.com%3E
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We want to tokenizer arithmetic expressions.
We are handling exceptional cases with UNKNOWN token.
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Carlos Maniero <carlosmaniero@gmail.com>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
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We are allocating heap memory to create tokens value, we can minimize the
number of allocations if we start using string_view.
We have other problems, right now the tokens value ownership are quite
unclear once the AST nodes also share the memory allocation done by
token_get_next_token function.
It's important to clarify we also have memory leaks on the current
implementation. Hence, we are going to start using string_view to make
the memory management easier. :^)
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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