inducer/cgen

C/C++ source generation from an AST

cgen's Issues

split preprocessor-related classes to different file

with the current file structure, it is not possible to implement the preprocessor #if statement, as it would overwrite (or be overwritten by) the C if () statement.

I would propose to update the file structure to:

cgen
+-- cgen
    +-- __init__.py
    +-- cuda.py
    +-- ispc.py
    +-- mapper.py
    +-- opencl.py
    +-- preprocessor
        +-- __init__.py

and implement the preprocessor #if (and others preprocessor statements?) in the file cgen/preprocessor/__init__.py.
this would provide access to the preprocessor functionalities like this:

import cgen as c
import cgen.preprocessor as pp
func = c.FunctionBody(
    c.FunctionDeclaration(c.Const(c.Pointer(c.Value("char", "greet"))), []),
    c.Block([
        pp.If('(a == 0)',
            [
                c.If('b == 0', c.Block([
                    c.Statement('return "hello world"')
                ]))
            ],
            [])
        ])
    )

print(func)

and will output something like:

char const *greet()
{
  #if (a == 0)
  if (b == 0)
  {
    return "hello world";
  }
  #endif
}

Classes for IfDef and InlineInitializers

While trying to modify opesci-fd to use this project's code generation capabilities, there were some classes I would have found helpful but couldn't find them in cgen. I added them to a wrapper and used them in the project. These include a class for IfDef and one for InlineInitializers. If you think they would be helpful to this project, I could submit a pull request here.

if, else-if, else structure

Hello, guys,

Is it possible to generate if-else-if structure using cgen?

if (condition_1) declaration_1;
else if (condition_2) declaration_2;
else if (condition_3) declaration_3;
.
.
.
else if (condition_n) declaration_n;
else declaration_default;

Creating C++ classes with cgen?

Hello all. I'd like to use cgen to create come C++ classes. From what I see that's not supported, correct?

Wrong result for nested type

Both

Pointer(ArrayOf(Pointer(POD(np.float32, "xxx")), 2)),
Pointer(Pointer(ArrayOf(POD(np.float32, "yyy"), 2))),

result in

float **xxx[2];
float **yyy[2];

The expected result is

float *(*xxx)[2];
float (**xxx)[2];

How to merge initialisation and assignment in cgen?

I have a cgen.Value("float", "temp") and an assignemnt, cgen.Assign("temp", "somefunc(1)"). It will generate the following C code

float temp;
temp = somefunc(1);

How to make the generated C code more nested from cgen.Value and cgen.Assign, such that it will look like:

float temp = somefunc(1);

Please push cgen==2018.1 to PyPi

Hi @inducer, thanks for maintaining the project it's very useful.
Looking at https://pypi.org/project/cgen/#history I don't see the latest release.

I would like to make use of the recently addded ifndef support.

import cgen as c

test = c.IfNDef("SOME_DEF",[c.Comment("Test1")],[c.Comment("Test2")])

print(test)

List Iterator Error

When running this code from:
http://pastebin.com/pr15PirN

I get this error.

http://pastebin.com/Rbjdi7Dj

Arithmetic expression

I would like to generate arithmetic expressions. for example:

float z = -25.f
float x = -(1.5f * 3e5) + (z / 123.f);

What is the idiomatic way to do it with cgen?