Fixed some of the code spacing for docs
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Maggie Mari
parent
538fd76b1f
commit
c25b4853fc
1 changed files with 80 additions and 82 deletions
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@ -35,18 +35,23 @@ First we define code generation methods in each AST node class:
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.. code-block:: python
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# Expression class for numeric literals like
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"1.0". class NumberExpressionNode(ExpressionNode):
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"1.0".
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class NumberExpressionNode(ExpressionNode):
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def __init__(self, value): self.value = value
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def __init__(self, value):
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self.value = value
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def CodeGen(self):
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...
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def CodeGen(self): ...
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# Expression class for referencing a variable, like "a".
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class VariableExpressionNode(ExpressionNode):
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def __init__(self, name): self.name = name
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def CodeGen(self): ...
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# Expression class for referencing a variable, like "a".
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class VariableExpressionNode(ExpressionNode):
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def __init__(self, name):
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self.name = name
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def CodeGen(self):
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...
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...
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@ -117,8 +122,8 @@ First we'll do numeric literals:
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.. code-block:: python
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def CodeGen(self): return
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Constant.real(Type.double(), self.value)
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def CodeGen(self):
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return Constant.real(Type.double(), self.value)
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@ -133,9 +138,11 @@ one directly.
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.. code-block:: python
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def CodeGen(self): if self.name in
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g_named_values: return g_named_values[self.name] else: raise
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RuntimeError('Unknown variable name: ' + self.name)
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def CodeGen(self):
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if self.name in g_named_values:
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return g_named_values[self.name]
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else:
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raise RuntimeError('Unknown variable name: ' + self.name)
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@ -152,23 +159,22 @@ and for `local variables <PythonLangImpl7.html#localvars>`_.
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.. code-block:: python
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def CodeGen(self): left = self.left.CodeGen()
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right = self.right.CodeGen()
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::
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if self.operator == '+':
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return g_llvm_builder.fadd(left, right, 'addtmp')
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elif self.operator == '-':
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return g_llvm_builder.fsub(left, right, 'subtmp')
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elif self.operator == '*':
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return g_llvm_builder.fmul(left, right, 'multmp')
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elif self.operator == '<':
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result = g_llvm_builder.fcmp(FCMP_ULT, left, right, 'cmptmp')
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# Convert bool 0 or 1 to double 0.0 or 1.0.
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return g_llvm_builder.uitofp(result, Type.double(), 'booltmp')
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else:
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raise RuntimeError('Unknown binary operator.')
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def CodeGen(self):
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left = self.left.CodeGen()
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right = self.right.CodeGen()
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if self.operator == '+':
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return g_llvm_builder.fadd(left, right, 'addtmp')
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elif self.operator == '-':
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return g_llvm_builder.fsub(left, right, 'subtmp')
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elif self.operator == '*':
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return g_llvm_builder.fmul(left, right, 'multmp')
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elif self.operator == '<':
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result = g_llvm_builder.fcmp(FCMP_ULT, left, right, 'cmptmp')
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# Convert bool 0 or 1 to double 0.0 or 1.0.
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return g_llvm_builder.uitofp(result, Type.double(), 'booltmp')
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else:
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raise RuntimeError('Unknown binary operator.')
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@ -213,19 +219,17 @@ the input value.
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.. code-block:: python
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def CodeGen(self): # Look up the name in the
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global module table. callee =
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g_llvm_module.get_function_named(self.callee)
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::
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# Check for argument mismatch error.
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if len(callee.args) != len(self.args):
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raise RuntimeError('Incorrect number of arguments passed.')
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arg_values = [i.CodeGen() for i in self.args]
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return g_llvm_builder.call(callee, arg_values, 'calltmp')
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def CodeGen(self):
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# Look up the name in the global module table.
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callee = g_llvm_module.get_function_named(self.callee)
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# Check for argument mismatch error.
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if len(callee.args) != len(self.args):
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raise RuntimeError('Incorrect number of arguments passed.')
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arg_values = [i.CodeGen() for i in self.args]
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return g_llvm_builder.call(callee, arg_values, 'calltmp')
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@ -267,13 +271,12 @@ with:
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.. code-block:: python
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def CodeGen(self): # Make the function type, eg.
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double(double,double). funct_type = Type.function( Type.double(),
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[Type.double()] \* len(self.args), False)
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::
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function = Function.new(g_llvm_module, funct_type, self.name)
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def CodeGen(self):
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# Make the function type, eg.
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double(double,double). funct_type = Type.function(
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Type.double(), [Type.double()] \* len(self.args), False)
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function = Function.new(g_llvm_module, funct_type, self.name)
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@ -303,10 +306,10 @@ the function call code above.
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.. code-block:: python
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# If the name conflicted, there was already
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something with the same name. # If it has a body, don't allow
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redefinition or reextern. if function.name != self.name:
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function.delete() function =
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g_llvm_module.get_function_named(self.name)
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something with the same name. # If it has a body, don't allow redefinition or reextern.
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if function.name != self.name:
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function.delete()
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function = g_llvm_module.get_function_named(self.name)
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@ -333,16 +336,14 @@ name.
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.. code-block:: python
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# If the function already has a body, reject
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this. if not function.is_declaration: raise RuntimeError('Redefinition
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of function.')
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::
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# If the function already has a body, reject this.
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if not function.is_declaration:
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raise RuntimeError('Redefinition of function.')
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# If F took a different number of args, reject.
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if len(callee.args) != len(self.args):
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raise RuntimeError('Redeclaration of a function with different number '
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'of args.')
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raise RuntimeError('Redeclaration of a function with different number '
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'of args.')
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@ -358,13 +359,12 @@ match up. If not, we emit an error.
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.. code-block:: python
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# Set names for all arguments and add them to the
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variables symbol table. for arg, arg_name in zip(function.args,
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self.args): arg.name = arg_name # Add arguments to variable symbol
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table. g_named_values[arg_name] = arg
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::
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# Set names for all arguments and add them to the variables symbol table.
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for arg, arg_name in zip(function.args, self.args):
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arg.name = arg_name
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# Add arguments to variable symbol
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table. g_named_values[arg_name] = arg
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return function
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@ -383,13 +383,12 @@ caller.
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.. code-block:: python
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def CodeGen(self): # Clear scope.
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g_named_values.clear()
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::
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# Create a function object.
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function = self.prototype.CodeGen()
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def CodeGen(self):
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# Clear scope.
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g_named_values.clear()
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# Create a function object.
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function = self.prototype.CodeGen()
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@ -404,10 +403,9 @@ LLVM Function object that is ready to go for us.
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.. code-block:: python
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# Create a new basic block to start insertion
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into. block = function.append_basic_block('entry') global
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g_llvm_builder g_llvm_builder = Builder.new(block) {% endhighlight
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%}
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# Create a new basic block to start insertion into.
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block = function.append_basic_block('entry')
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global g_llvm_builder g_llvm_builder = Builder.new(block) {% endhighlight %}
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Now we get to the point where ``g_llvm_builder`` is set up. The first
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line creates a new `basic
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