public override Value Visit(FunctionDefinition definition)
{
var function = GetOrDeclareFunction(definition.Signature);
if (!function.IsDeclaration)
{
throw new CodeGeneratorException($"Function {function.Name} cannot be redefined in the same module");
}
try
{
var entryBlock = function.AppendBasicBlock("entry");
InstructionBuilder.PositionAtEnd(entryBlock);
using (NamedValues.EnterScope( ))
{
foreach (var param in definition.Signature.Parameters)
{
NamedValues[param.Name] = function.Parameters[param.Index];
}
var funcReturn = definition.Body.Accept(this);
InstructionBuilder.Return(funcReturn);
function.Verify( );
FunctionPassManager.Run(function);
return(function);
}
}
catch (CodeGeneratorException)
{
function.EraseFromParent( );
throw;
}
}
public override Value?Visit(FunctionDefinition definition)
{
definition.ValidateNotNull(nameof(definition));
var function = GetOrDeclareFunction(definition.Signature);
if (!function.IsDeclaration)
{
throw new CodeGeneratorException($"Function {function.Name} cannot be redefined in the same module");
}
try
{
var entryBlock = function.AppendBasicBlock("entry");
InstructionBuilder.PositionAtEnd(entryBlock);
using (NamedValues.EnterScope( ))
{
foreach (var param in definition.Signature.Parameters)
{
var argSlot = InstructionBuilder.Alloca(function.Context.DoubleType)
.RegisterName(param.Name);
InstructionBuilder.Store(function.Parameters[param.Index], argSlot);
NamedValues[param.Name] = argSlot;
}
foreach (LocalVariableDeclaration local in definition.LocalVariables)
{
var localSlot = InstructionBuilder.Alloca(function.Context.DoubleType)
.RegisterName(local.Name);
NamedValues[local.Name] = localSlot;
}
EmitBranchToNewBlock("body");
var funcReturn = definition.Body.Accept(this) ?? throw new CodeGeneratorException(ExpectValidFunc);
InstructionBuilder.Return(funcReturn);
function.Verify( );
FunctionPassManager.Run(function);
if (definition.IsAnonymous)
{
function.AddAttribute(FunctionAttributeIndex.Function, AttributeKind.AlwaysInline)
.Linkage(Linkage.Private);
AnonymousFunctions.Add(function);
}
return(function);
}
}
catch (CodeGeneratorException)
{
function.EraseFromParent( );
throw;
}
}
public override IAstNode VisitForExpression([NotNull] ForExpressionContext context)
{
var initializer = ( LocalVariableDeclaration )context.Initializer.Accept(this);
ForInExpression retVal;
using (NamedValues.EnterScope( ))
{
Push(initializer);
var step = ( IExpression )context.StepExpression?.Accept(this) ?? new ConstantExpression(default, 1.0);
public override Value Visit(VarInExpression varInExpression)
{
using (NamedValues.EnterScope( ))
{
EmitBranchToNewBlock("VarInScope");
foreach (var localVar in varInExpression.LocalVariables)
{
Alloca alloca = LookupVariable(localVar.Name);
Value initValue = Context.CreateConstant(0.0);
if (localVar.Initializer != null)
{
initValue = localVar.Initializer.Accept(this);
}
InstructionBuilder.Store(initValue, alloca);
}
return(varInExpression.Body.Accept(this));
}
}
public override Value?Visit(VarInExpression varInExpression)
{
varInExpression.ValidateNotNull(nameof(varInExpression));
using (NamedValues.EnterScope( ))
{
EmitBranchToNewBlock("VarInScope");
foreach (var localVar in varInExpression.LocalVariables)
{
Alloca alloca = LookupVariable(localVar.Name);
Value initValue = Context.CreateConstant(0.0);
if (localVar.Initializer != null)
{
initValue = localVar.Initializer.Accept(this) ?? throw new CodeGeneratorException(ExpectValidExpr);
}
InstructionBuilder.Store(initValue, alloca);
}
return(varInExpression.Body.Accept(this));
}
}
public override Value?Visit(ForInExpression forInExpression)
{
forInExpression.ValidateNotNull(nameof(forInExpression));
EmitLocation(forInExpression);
var function = InstructionBuilder.InsertFunction;
if (function is null)
{
throw new InternalCodeGeneratorException("ICE: Expected block attached to a function at this point");
}
string varName = forInExpression.LoopVariable.Name;
Alloca allocaVar = LookupVariable(varName);
// Emit the start code first, without 'variable' in scope.
Value?startVal;
if (forInExpression.LoopVariable.Initializer != null)
{
startVal = forInExpression.LoopVariable.Initializer.Accept(this);
if (startVal is null)
{
return(null);
}
}
else
{
startVal = Context.CreateConstant(0.0);
}
// store the value into allocated location
InstructionBuilder.Store(startVal, allocaVar);
// Make the new basic block for the loop header.
var loopBlock = function.AppendBasicBlock("loop");
// Insert an explicit fall through from the current block to the loopBlock.
InstructionBuilder.Branch(loopBlock);
// Start insertion in loopBlock.
InstructionBuilder.PositionAtEnd(loopBlock);
// Within the loop, the variable is defined equal to the PHI node.
// So, push a new scope for it and any values the body might set
using (NamedValues.EnterScope( ))
{
EmitBranchToNewBlock("ForInScope");
// Emit the body of the loop. This, like any other expression, can change the
// current BB. Note that we ignore the value computed by the body, but don't
// allow an error.
if (forInExpression.Body.Accept(this) == null)
{
return(null);
}
Value?stepValue = forInExpression.Step.Accept(this);
if (stepValue == null)
{
return(null);
}
// Compute the end condition.
Value?endCondition = forInExpression.Condition.Accept(this);
if (endCondition == null)
{
return(null);
}
// since the Alloca is created as a non-opaque pointer it is OK to just use the
// ElementType. If full opaque pointer support was used, then the Lookup map
// would need to include the type of the value allocated.
var curVar = InstructionBuilder.Load(allocaVar.ElementType, allocaVar)
.RegisterName(varName);
var nextVar = InstructionBuilder.FAdd(curVar, stepValue)
.RegisterName("nextvar");
InstructionBuilder.Store(nextVar, allocaVar);
// Convert condition to a bool by comparing non-equal to 0.0.
endCondition = InstructionBuilder.Compare(RealPredicate.OrderedAndNotEqual, endCondition, Context.CreateConstant(0.0))
.RegisterName("loopcond");
// Create the "after loop" block and insert it.
var afterBlock = function.AppendBasicBlock("afterloop");
// Insert the conditional branch into the end of LoopEndBB.
InstructionBuilder.Branch(endCondition, loopBlock, afterBlock);
InstructionBuilder.PositionAtEnd(afterBlock);
// for expression always returns 0.0 for consistency, there is no 'void'
return(Context.DoubleType.GetNullValue( ));
}
}
public override Value?Visit(FunctionDefinition definition)
{
definition.ValidateNotNull(nameof(definition));
var function = GetOrDeclareFunction(definition.Signature);
if (!function.IsDeclaration)
{
throw new CodeGeneratorException($"Function {function.Name} cannot be redefined in the same module");
}
Debug.Assert(function.DISubProgram != null, "Expected function with non-null DISubProgram");
LexicalBlocks.Push(function.DISubProgram);
try
{
var entryBlock = function.AppendBasicBlock("entry");
InstructionBuilder.PositionAtEnd(entryBlock);
// Unset the location for the prologue emission (leading instructions with no
// location in a function are considered part of the prologue and the debugger
// will run past them when breaking on a function)
EmitLocation(null);
using (NamedValues.EnterScope( ))
{
foreach (var param in definition.Signature.Parameters)
{
var argSlot = InstructionBuilder.Alloca(function.Context.DoubleType)
.RegisterName(param.Name);
AddDebugInfoForAlloca(argSlot, function, param);
InstructionBuilder.Store(function.Parameters[param.Index], argSlot);
NamedValues[param.Name] = argSlot;
}
foreach (LocalVariableDeclaration local in definition.LocalVariables)
{
var localSlot = InstructionBuilder.Alloca(function.Context.DoubleType)
.RegisterName(local.Name);
AddDebugInfoForAlloca(localSlot, function, local);
NamedValues[local.Name] = localSlot;
}
EmitBranchToNewBlock("body");
var funcReturn = definition.Body.Accept(this) ?? throw new CodeGeneratorException(ExpectValidFunc);
InstructionBuilder.Return(funcReturn);
Module.DIBuilder.Finish(function.DISubProgram);
function.Verify( );
FunctionPassManager.Run(function);
if (definition.IsAnonymous)
{
function.AddAttribute(FunctionAttributeIndex.Function, AttributeKind.AlwaysInline)
.Linkage(Linkage.Private);
AnonymousFunctions.Add(function);
}
return(function);
}
}
catch (CodeGeneratorException)
{
function.EraseFromParent( );
throw;
}
}
public override Value Visit(ForInExpression forInExpression)
{
var function = InstructionBuilder.InsertBlock.ContainingFunction;
string varName = forInExpression.LoopVariable.Name;
// Emit the start code first, without 'variable' in scope.
Value startVal;
if (forInExpression.LoopVariable.Initializer != null)
{
startVal = forInExpression.LoopVariable.Initializer.Accept(this);
if (startVal == null)
{
return(null);
}
}
else
{
startVal = Context.CreateConstant(0.0);
}
// Make the new basic block for the loop header, inserting after current
// block.
var preHeaderBlock = InstructionBuilder.InsertBlock;
var loopBlock = function.AppendBasicBlock("loop");
// Insert an explicit fall through from the current block to the loopBlock.
InstructionBuilder.Branch(loopBlock);
// Start insertion in loopBlock.
InstructionBuilder.PositionAtEnd(loopBlock);
// Start the PHI node with an entry for Start.
var variable = InstructionBuilder.PhiNode(Context.DoubleType)
.RegisterName(varName);
variable.AddIncoming(startVal, preHeaderBlock);
// Within the loop, the variable is defined equal to the PHI node.
// So, push a new scope for it and any values the body might set
using (NamedValues.EnterScope( ))
{
NamedValues[varName] = variable;
// Emit the body of the loop. This, like any other expression, can change the
// current BB. Note that we ignore the value computed by the body, but don't
// allow an error.
if (forInExpression.Body.Accept(this) == null)
{
return(null);
}
Value stepValue = forInExpression.Step.Accept(this);
if (stepValue == null)
{
return(null);
}
var nextVar = InstructionBuilder.FAdd(variable, stepValue)
.RegisterName("nextvar");
// Compute the end condition.
Value endCondition = forInExpression.Condition.Accept(this);
if (endCondition == null)
{
return(null);
}
// Convert condition to a bool by comparing non-equal to 0.0.
endCondition = InstructionBuilder.Compare(RealPredicate.OrderedAndNotEqual, endCondition, Context.CreateConstant(0.0))
.RegisterName("loopcond");
// capture loop end result block for loop variable PHI node
var loopEndBlock = InstructionBuilder.InsertBlock;
// Create the "after loop" block and insert it.
var afterBlock = function.AppendBasicBlock("afterloop");
// Insert the conditional branch into the end of LoopEndBB.
InstructionBuilder.Branch(endCondition, loopBlock, afterBlock);
InstructionBuilder.PositionAtEnd(afterBlock);
// Add a new entry to the PHI node for the back-edge.
variable.AddIncoming(nextVar, loopEndBlock);
// for expression always returns 0.0 for consistency, there is no 'void'
return(Context.DoubleType.GetNullValue( ));
}
}
