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For now function calls are following the C's calling convention, which
means they are using the following registers to pass functions'
arguments:
rdi, rsi, rdx, rcx, r8, r9
If a function has more then 6 parameters, the compilation will fail.
To enable function with more than 6 parameters we will need to save the
extra arguments on stack.
Naming:
parameters: function parameters are the variables a function receives.
arguments: Arguments are the values passed to a function when calling
it.
Calling mechanism:
When a function is called, all the expressions passed as argument are
evaluated, after the evaluation, the result is stored on the register
that represents its argument position, the first argument will be
stored on rdi, the second on rsi and so on.
Receiving mechanism:
When a function starts, the first thing it does is store all the
registers onto the stack. So rdi will be stored on -8(rbp), rsi on
-16(rbp) and so on. And, a ref_entry is created making the
relationship parameter-stack_offset.
Signed-off-by: Carlos Maniero <carlos@maniero.me>
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This is an initial commit that enables function calls. At this point
only functions with no parameters is going to work.
Signed-off-by: Carlos Maniero <carlos@maniero.me>
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When the assignment value is a literal, it just assigns zero or one to
the variable stack's location. If the value is an expression, it
compiles the expression and assign zeros and ones based on expression
result.
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Now if statements are complete! The function
%gas_assembly_generator_compile_condition% is generic and will be used
for any other flow-control statment. The only requirement to it work is
having two labels: One to jump when the condition is true, and another
one when the condition is false.
Signed-off-by: Carlos Maniero <carlos@maniero.me>
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If statements are now working, the only exception is for the comparators
|| and && that will be addressed in a further commit. Checks tested:
fn main(): i32 {
let n: i32 = 11;
if (n == 11) {
if n != 12 {
if n < 12 {
if n <= 11 {
if n > 10 {
if n >= 11 {
return 42;
}
}
}
}
}
}
return n;
}
To compile the && and || a precedence issue must be addressed: they must
have the highest precedence, witch is not working now:
1 == 2 || 3 != 2
The or should be the higher level of the tree in the example above.
Signed-off-by: Carlos Maniero <carlos@maniero.me>
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This commit parses a if statement following the grammar bellow:
if boolean_expression {
n_epressions;
}
No else neither code generation was implemented.
Signed-off-by: Carlos Maniero <carlos@maniero.me>
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This commit introduces a few changes in pipalang syntax. Now, both
functions and variables requires keywords to be defined.
before:
main(): i32 {
a: i32 = 2;
return a;
}
now:
fn main(): i32 {
let a: i32 = 2;
return a;
}
Signed-off-by: Carlos Maniero <carlos@maniero.me>
Reviewed-by: Johnny Richard <johnny@johnnyrichard.com>
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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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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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We were moving the stack data for variable reference to another stack
position ending up with two pointer to the same value.
// a: i32 = 1;
mov $1, -8(%rbp)
// b: i32 = a;
mov -8(%rbp), %rax
mov %rax, -24(%rbp)
mov -24(%rbp), %rax
mov %rax, -16(%rbp)
After this changes, we wont create a new temp space on stack if we don't
need it. See bellow the example after the optimization:
// a: i32 = 1;
mov $1, -8(%rbp)
// b: i32 = a;
mov -8(%rbp), %rax
mov %rax, -16(%rbp)
Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
Co-authored-by: Carlos Maniero <carlosmaniero@gmail.com>
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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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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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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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Signed-off-by: Johnny Richard <johnny@johnnyrichard.com>
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