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Copy pathPythonCompiler.cs
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2397 lines (2191 loc) · 93.3 KB
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using DotPython.Compiler.Binding;
using DotPython.Compiler.Bytecode;
using DotPython.Language.Ast;
using DotPython.Language.Diagnostics;
using DotPython.Language.Text;
namespace DotPython.Compiler;
public static class PythonCompiler
{
public static PythonCompilationResult Compile(PythonModule module, string codeName = "<module>")
{
return CompileCore(module, codeName, enableReturnLocal: true, enableCallLocal: true);
}
internal static PythonCompilationResult CompileWithoutReturnLocal(
PythonModule module,
string codeName = "<module>"
)
{
return CompileCore(module, codeName, enableReturnLocal: false, enableCallLocal: true);
}
internal static PythonCompilationResult CompileWithoutCallLocal(
PythonModule module,
string codeName = "<module>"
)
{
return CompileCore(module, codeName, enableReturnLocal: true, enableCallLocal: false);
}
private static PythonCompilationResult CompileCore(
PythonModule module,
string codeName,
bool enableReturnLocal,
bool enableCallLocal
)
{
ArgumentNullException.ThrowIfNull(module);
ArgumentException.ThrowIfNullOrWhiteSpace(codeName);
var binding = PythonSymbolBinder.Bind(module);
var diagnostics = new List<Diagnostic>(binding.Diagnostics);
return new Compiler(
codeName,
binding.ModuleScope,
diagnostics,
enableReturnLocal,
enableCallLocal
).Compile(module);
}
private sealed class Compiler
{
private readonly string _codeName;
private readonly List<PythonConstant> _constants = [];
private readonly List<Diagnostic> _diagnostics;
private readonly List<int> _finallyBarriers = [];
private readonly List<PythonInstruction> _instructions = [];
private readonly List<LoopScope> _loopScopes = [];
private readonly List<string> _names = [];
private readonly List<ProtectionScope> _protectionScopes = [];
private readonly PythonBoundScope _scope;
private readonly bool _enableCallLocal;
private readonly bool _enableReturnLocal;
private readonly string? _enclosingClassName;
internal Compiler(
string codeName,
PythonBoundScope scope,
List<Diagnostic> diagnostics,
bool enableReturnLocal,
bool enableCallLocal,
string? enclosingClassName = null
)
{
_codeName = codeName;
_scope = scope;
_diagnostics = diagnostics;
_enableReturnLocal = enableReturnLocal;
_enableCallLocal = enableCallLocal;
_enclosingClassName = enclosingClassName;
}
internal PythonCompilationResult Compile(PythonModule module)
{
var code = CompileCode(module.Statements, module.Span.End);
return new PythonCompilationResult(code, _diagnostics);
}
private PythonCodeObject CompileCode(
IReadOnlyList<PythonStatement> statements,
int endPosition,
IReadOnlyList<PythonParameter>? signature = null,
bool isGenerator = false
)
{
CompileStatements(statements);
Emit(PythonOpCode.ReturnNone, 0, new TextSpan(endPosition, 0));
return CreateCodeObject(signature, isGenerator);
}
private PythonCodeObject CreateCodeObject(
IReadOnlyList<PythonParameter>? signature,
bool isGenerator = false
)
{
var keywordOnlyCount = 0;
var hasVariadicPositional = false;
var hasVariadicKeywords = false;
foreach (var parameter in signature ?? [])
{
switch (parameter.Kind)
{
case PythonParameterKind.KeywordOnly:
keywordOnlyCount++;
break;
case PythonParameterKind.VariadicPositional:
hasVariadicPositional = true;
break;
case PythonParameterKind.VariadicKeywords:
hasVariadicKeywords = true;
break;
}
}
return new PythonCodeObject(
_codeName,
_instructions,
_constants,
_names,
[.. _scope.LocalNames],
[.. _scope.CellVariableNames],
[.. _scope.FreeVariableNames],
_scope.Parameters.Count,
keywordOnlyCount,
hasVariadicPositional,
hasVariadicKeywords,
isGenerator
);
}
private void CompileStatement(PythonStatement statement)
{
switch (statement)
{
case PythonAssignmentStatement assignment:
CompileExpression(assignment.Value);
CompileAssignmentTarget(assignment.Target);
break;
case PythonAugmentedAssignmentStatement augmented:
CompileAugmentedAssignment(augmented);
break;
case PythonAnnotatedAssignmentStatement annotated:
// PEP 649 default: the annotation is never evaluated. A bare
// annotation binds nothing; one with a value assigns normally.
if (annotated.Value is not null)
{
CompileExpression(annotated.Value);
CompileAssignmentTarget(annotated.Target);
}
break;
case PythonExpressionStatement expressionStatement:
CompileExpression(expressionStatement.Expression);
Emit(PythonOpCode.PopTop, 0, expressionStatement.Span);
break;
case PythonIfStatement ifStatement:
CompileIfStatement(ifStatement);
break;
case PythonWhileStatement whileStatement:
CompileWhileStatement(whileStatement);
break;
case PythonForStatement forStatement:
CompileForStatement(forStatement);
break;
case PythonFunctionDefinitionStatement function:
CompileFunctionDefinition(function);
break;
case PythonClassDefinitionStatement @class:
CompileClassDefinition(@class);
break;
case PythonReturnStatement returnStatement:
CompileReturnStatement(returnStatement);
break;
case PythonBreakStatement breakStatement:
CompileBreakStatement(breakStatement);
break;
case PythonContinueStatement continueStatement:
CompileContinueStatement(continueStatement);
break;
case PythonPassStatement:
case PythonGlobalStatement:
case PythonNonlocalStatement:
break;
case PythonAssertStatement assertStatement:
CompileAssertStatement(assertStatement);
break;
case PythonDeleteStatement deleteStatement:
CompileDeleteStatement(deleteStatement);
break;
case PythonRaiseStatement raiseStatement:
CompileRaiseStatement(raiseStatement);
break;
case PythonTryStatement tryStatement:
CompileTryStatement(tryStatement);
break;
case PythonWithStatement withStatement:
CompileWithStatement(withStatement, itemIndex: 0);
break;
case PythonMatchStatement matchStatement:
CompileMatchStatement(matchStatement);
break;
case PythonImportStatement importStatement:
CompileImportStatement(importStatement);
break;
case PythonFromImportStatement fromImportStatement:
CompileFromImportStatement(fromImportStatement);
break;
default:
Report(
"DPY3001",
$"Statement type '{statement.GetType().Name}' is not supported.",
statement.Span
);
break;
}
}
private void CompileExpression(PythonExpression expression)
{
switch (expression)
{
case PythonConstantExpression constant:
Emit(
PythonOpCode.LoadConstant,
AddConstant(PythonLiteralDecoder.Decode(constant, _diagnostics)),
constant.Span
);
break;
case PythonNameExpression name:
EmitLoadName(name);
break;
case PythonParenthesizedExpression parenthesized:
CompileExpression(parenthesized.Expression);
break;
case PythonUnaryExpression unary:
CompileExpression(unary.Operand);
Emit(GetUnaryOpCode(unary.Operator), 0, unary.Span);
break;
case PythonBinaryExpression binary:
CompileBinaryExpression(binary);
break;
case PythonComparisonExpression comparison:
CompileComparisonExpression(comparison);
break;
case PythonCallExpression call:
if (
call.Target is PythonNameExpression { Name: "super" }
&& call.Arguments.Count == 0
&& call.KeywordArguments.Count == 0
&& _enclosingClassName is not null
&& _scope.Parameters.Count > 0
)
{
CompileExpression(call.Target);
CompileExpression(new PythonNameExpression(_enclosingClassName, call.Span));
CompileExpression(
new PythonNameExpression(_scope.Parameters[0], call.Span)
);
Emit(PythonOpCode.Call, 2, call.Span);
break;
}
if (
call.Arguments.Any(argument => argument is PythonStarredExpression)
|| call.KeywordArguments.Any(keyword => keyword.Name is null)
)
{
CompileCallWithUnpacking(call);
break;
}
var targetName = GetNameExpression(call.Target);
if (
_enableCallLocal
&& call.Arguments.Count == 0
&& call.KeywordArguments.Count == 0
&& targetName is not null
&& _scope.Kind == PythonScopeKind.Function
&& _scope.IsLocal(targetName.Name)
&& !_scope.IsCellVariable(targetName.Name)
)
{
Emit(PythonOpCode.CallLocal, GetVariableIndex(targetName.Name), call.Span);
break;
}
CompileExpression(call.Target);
foreach (var argument in call.Arguments)
{
CompileExpression(argument);
}
if (call.KeywordArguments.Count == 0)
{
Emit(PythonOpCode.Call, call.Arguments.Count, call.Span);
break;
}
foreach (var keywordArgument in call.KeywordArguments)
{
CompileExpression(keywordArgument.Value);
}
foreach (var keywordArgument in call.KeywordArguments)
{
Emit(
PythonOpCode.LoadConstant,
AddConstant(
new PythonConstant(
PythonConstantType.TextValue,
keywordArgument.Name
)
),
keywordArgument.Span
);
}
Emit(PythonOpCode.BuildTuple, call.KeywordArguments.Count, call.Span);
Emit(
PythonOpCode.CallKeyword,
call.Arguments.Count + call.KeywordArguments.Count,
call.Span
);
break;
case PythonListExpression list:
if (list.Elements.Any(element => element is PythonStarredExpression))
{
CompileUnpackedElements(list.Elements, list.Span);
}
else
{
CompileElements(list.Elements);
Emit(PythonOpCode.BuildList, list.Elements.Count, list.Span);
}
break;
case PythonTupleExpression tuple:
if (tuple.Elements.Any(element => element is PythonStarredExpression))
{
CompileUnpackedElements(tuple.Elements, tuple.Span);
Emit(PythonOpCode.ListToTuple, 0, tuple.Span);
}
else
{
CompileElements(tuple.Elements);
Emit(PythonOpCode.BuildTuple, tuple.Elements.Count, tuple.Span);
}
break;
case PythonDictionaryExpression dictionary:
if (dictionary.Items.Any(item => item.Key is null))
{
Emit(PythonOpCode.BuildDictionary, 0, dictionary.Span);
foreach (var item in dictionary.Items)
{
if (item.Key is null)
{
CompileExpression(item.Value);
Emit(PythonOpCode.DictionaryUpdate, 0, item.Span);
}
else
{
CompileExpression(item.Key);
CompileExpression(item.Value);
Emit(PythonOpCode.DictionaryAdd, 0, item.Span);
}
}
}
else
{
foreach (var item in dictionary.Items)
{
CompileExpression(item.Key!);
CompileExpression(item.Value);
}
Emit(PythonOpCode.BuildDictionary, dictionary.Items.Count, dictionary.Span);
}
break;
case PythonSubscriptionExpression subscription:
CompileExpression(subscription.Target);
CompileExpression(subscription.Index);
Emit(PythonOpCode.LoadSubscript, 0, subscription.Span);
break;
case PythonSetExpression setExpression:
if (setExpression.Elements.Any(element => element is PythonStarredExpression))
{
Emit(PythonOpCode.BuildSet, 0, setExpression.Span);
foreach (var element in setExpression.Elements)
{
if (element is PythonStarredExpression starredElement)
{
CompileExpression(starredElement.Operand);
Emit(PythonOpCode.SetUpdate, 0, starredElement.Span);
}
else
{
CompileExpression(element);
Emit(PythonOpCode.SetAdd, 0, element.Span);
}
}
}
else
{
CompileElements(setExpression.Elements);
Emit(
PythonOpCode.BuildSet,
setExpression.Elements.Count,
setExpression.Span
);
}
break;
case PythonFormattedStringExpression formatted:
CompileFormattedString(formatted);
break;
case PythonTemplateStringExpression template:
CompileTemplateString(template);
break;
case PythonLambdaExpression lambdaExpression:
CompileLambdaExpression(lambdaExpression);
break;
case PythonYieldExpression yieldExpression:
if (yieldExpression.Value is null)
{
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.NoneValue, null)),
yieldExpression.Span
);
}
else
{
CompileExpression(yieldExpression.Value);
}
// The resume path pushes the yield expression's result (None in
// phase 1) after the suspension point.
Emit(PythonOpCode.Yield, 0, yieldExpression.Span);
break;
case PythonYieldFromExpression yieldFrom:
{
// result = yield from e:
// iter; None; loop: step -> (value,True)|(return,False);
// yielded values re-yield and the sent value feeds the next step;
// on completion the delegate's return value is the result.
CompileExpression(yieldFrom.Source);
Emit(PythonOpCode.GetIterator, 0, yieldFrom.Span);
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.NoneValue, null)),
yieldFrom.Span
);
var loopStart = _instructions.Count;
Emit(PythonOpCode.YieldFromStep, 0, yieldFrom.Span);
var finished = Emit(PythonOpCode.JumpIfFalse, 0, yieldFrom.Span);
Emit(PythonOpCode.Yield, 0, yieldFrom.Span);
Emit(PythonOpCode.Jump, loopStart, yieldFrom.Span);
PatchJump(finished, _instructions.Count);
Emit(PythonOpCode.RotateTwo, 0, yieldFrom.Span);
Emit(PythonOpCode.PopTop, 0, yieldFrom.Span);
break;
}
case PythonAssignmentExpression assignmentExpression:
CompileExpression(assignmentExpression.Value);
Emit(PythonOpCode.CopyTop, 0, assignmentExpression.Span);
EmitStoreName(assignmentExpression.Target);
break;
case PythonConditionalExpression conditional:
CompileExpression(conditional.Condition);
var falseJump = Emit(PythonOpCode.JumpIfFalse, 0, conditional.Condition.Span);
CompileExpression(conditional.TrueResult);
var endJump = Emit(PythonOpCode.Jump, 0, conditional.Span);
PatchJump(falseJump, _instructions.Count);
CompileExpression(conditional.FalseResult);
PatchJump(endJump, _instructions.Count);
break;
case PythonSliceExpression slice:
CompileOptionalSliceBound(slice.Start, slice.Span);
CompileOptionalSliceBound(slice.Stop, slice.Span);
CompileOptionalSliceBound(slice.Step, slice.Span);
Emit(PythonOpCode.BuildSlice, 0, slice.Span);
break;
case PythonListComprehensionExpression listComprehension:
CompileComprehension(
listComprehension,
"<listcomp>",
listComprehension.Clauses
);
break;
case PythonDictionaryComprehensionExpression dictionaryComprehension:
CompileComprehension(
dictionaryComprehension,
"<dictcomp>",
dictionaryComprehension.Clauses
);
break;
case PythonSetComprehensionExpression setComprehension:
CompileComprehension(setComprehension, "<setcomp>", setComprehension.Clauses);
break;
case PythonGeneratorExpression generatorExpression:
CompileComprehension(
generatorExpression,
"<genexpr>",
generatorExpression.Clauses
);
break;
case PythonStarredExpression starred:
Report(
"DPY3113",
"A starred expression is only valid in call arguments and "
+ "assignment targets.",
starred.Span
);
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.NoneValue, null)),
starred.Span
);
break;
case PythonAttributeExpression attribute:
CompileExpression(attribute.Target);
Emit(
PythonOpCode.LoadAttribute,
GetNameIndex(attribute.AttributeName),
attribute.Span
);
break;
default:
Report(
"DPY3002",
$"Expression type '{expression.GetType().Name}' is not supported.",
expression.Span
);
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.NoneValue, null)),
expression.Span
);
break;
}
}
private void CompileElements(IReadOnlyList<PythonExpression> elements)
{
foreach (var element in elements)
{
CompileExpression(element);
}
}
private void CompileTemplateString(PythonTemplateStringExpression template)
{
var statics = new List<string>();
var interpolations = new List<PythonFormattedStringInterpolationPart>();
var current = new System.Text.StringBuilder();
foreach (var part in template.Parts)
{
switch (part)
{
case PythonFormattedStringLiteralPart literal:
current.Append(
template.IsRaw
? literal.RawText
: PythonLiteralDecoder.DecodeEscapes(literal.RawText)
);
break;
case PythonFormattedStringInterpolationPart interpolation:
statics.Add(current.ToString());
current.Clear();
interpolations.Add(interpolation);
break;
}
}
statics.Add(current.ToString());
foreach (var text in statics)
{
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.TextValue, text)),
template.Span
);
}
foreach (var interpolation in interpolations)
{
CompileExpression(interpolation.Expression);
Emit(
PythonOpCode.LoadConstant,
AddConstant(
new PythonConstant(
PythonConstantType.TextValue,
interpolation.RawExpression ?? string.Empty
)
),
interpolation.Span
);
Emit(
PythonOpCode.LoadConstant,
AddConstant(
interpolation.Conversion is { } conversion
? new PythonConstant(
PythonConstantType.TextValue,
conversion.ToString()
)
: new PythonConstant(PythonConstantType.NoneValue, null)
),
interpolation.Span
);
Emit(
PythonOpCode.LoadConstant,
AddConstant(
new PythonConstant(
PythonConstantType.TextValue,
interpolation.FormatSpecification ?? string.Empty
)
),
interpolation.Span
);
Emit(PythonOpCode.MakeInterpolation, 0, interpolation.Span);
}
Emit(PythonOpCode.MakeTemplate, interpolations.Count, template.Span);
}
private void CompileFormattedString(PythonFormattedStringExpression formatted)
{
var partCount = 0;
foreach (var part in formatted.Parts)
{
switch (part)
{
case PythonFormattedStringLiteralPart literal:
var decoded = formatted.IsRaw
? literal.RawText
: PythonLiteralDecoder.DecodeEscapes(literal.RawText);
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.TextValue, decoded)),
literal.Span
);
partCount++;
break;
case PythonFormattedStringInterpolationPart interpolation:
CompileExpression(interpolation.Expression);
var flags = interpolation.Conversion switch
{
's' => 1,
'r' => 2,
'a' => 3,
_ => 0,
};
if (interpolation.FormatSpecification is not null)
{
Emit(
PythonOpCode.LoadConstant,
AddConstant(
new PythonConstant(
PythonConstantType.TextValue,
interpolation.FormatSpecification
)
),
interpolation.Span
);
flags |= 4;
}
Emit(PythonOpCode.FormatValue, flags, interpolation.Span);
partCount++;
break;
}
}
if (partCount == 0)
{
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.TextValue, string.Empty)),
formatted.Span
);
return;
}
if (partCount > 1)
{
Emit(PythonOpCode.BuildString, partCount, formatted.Span);
}
}
private void EmitFunctionCreation(
IReadOnlyList<PythonParameter> parameters,
int constantIndex,
TextSpan span
)
{
var simpleSignature = parameters.All(parameter =>
parameter.Kind == PythonParameterKind.Positional
);
var positionalDefaultCount = 0;
foreach (var parameter in parameters)
{
if (parameter.Kind != PythonParameterKind.Positional || parameter.Default is null)
{
continue;
}
CompileExpression(parameter.Default);
positionalDefaultCount++;
}
if (simpleSignature)
{
if (positionalDefaultCount == 0)
{
Emit(PythonOpCode.MakeFunction, constantIndex, span);
}
else
{
Emit(PythonOpCode.BuildTuple, positionalDefaultCount, span);
Emit(PythonOpCode.MakeFunctionWithDefaults, constantIndex, span);
}
return;
}
Emit(PythonOpCode.BuildTuple, positionalDefaultCount, span);
var keywordDefaultCount = 0;
foreach (var parameter in parameters)
{
if (parameter.Kind != PythonParameterKind.KeywordOnly || parameter.Default is null)
{
continue;
}
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.TextValue, parameter.Name)),
parameter.Span
);
CompileExpression(parameter.Default);
keywordDefaultCount++;
}
Emit(PythonOpCode.BuildDictionary, keywordDefaultCount, span);
Emit(PythonOpCode.MakeFunctionWithSignature, constantIndex, span);
}
private void CompileLambdaExpression(PythonLambdaExpression lambdaExpression)
{
var childScope = _scope.Children.Single(scope =>
ReferenceEquals(scope.Definition, lambdaExpression)
);
var childCompiler = new Compiler(
"<lambda>",
childScope,
_diagnostics,
_enableReturnLocal,
_enableCallLocal
);
var childCode = childCompiler.CompileLambdaCode(lambdaExpression);
var constantIndex = AddConstant(
new PythonConstant(PythonConstantType.CodeObject, childCode)
);
EmitFunctionCreation(lambdaExpression.Parameters, constantIndex, lambdaExpression.Span);
}
private PythonCodeObject CompileLambdaCode(PythonLambdaExpression lambdaExpression)
{
CompileExpression(lambdaExpression.Body);
Emit(PythonOpCode.ReturnValue, 0, lambdaExpression.Body.Span);
return CreateCodeObject(lambdaExpression.Parameters);
}
private void CompileUnpackedElements(
IReadOnlyList<PythonExpression> elements,
TextSpan span
)
{
Emit(PythonOpCode.BuildList, 0, span);
foreach (var element in elements)
{
if (element is PythonStarredExpression starred)
{
CompileExpression(starred.Operand);
Emit(PythonOpCode.ListExtend, 0, starred.Span);
}
else
{
CompileExpression(element);
Emit(PythonOpCode.ListAppend, 0, element.Span);
}
}
}
private void CompileCallWithUnpacking(PythonCallExpression call)
{
CompileExpression(call.Target);
Emit(PythonOpCode.BuildList, 0, call.Span);
foreach (var argument in call.Arguments)
{
if (argument is PythonStarredExpression starred)
{
CompileExpression(starred.Operand);
Emit(PythonOpCode.ListExtend, 0, starred.Span);
}
else
{
CompileExpression(argument);
Emit(PythonOpCode.ListAppend, 0, argument.Span);
}
}
if (call.KeywordArguments.Count == 0)
{
Emit(PythonOpCode.CallUnpacked, 0, call.Span);
return;
}
Emit(PythonOpCode.BuildDictionary, 0, call.Span);
foreach (var keywordArgument in call.KeywordArguments)
{
if (keywordArgument.Name is null)
{
CompileExpression(keywordArgument.Value);
Emit(PythonOpCode.DictionaryMerge, 0, keywordArgument.Span);
}
else
{
Emit(
PythonOpCode.LoadConstant,
AddConstant(
new PythonConstant(PythonConstantType.TextValue, keywordArgument.Name)
),
keywordArgument.Span
);
CompileExpression(keywordArgument.Value);
Emit(PythonOpCode.DictionaryAdd, 0, keywordArgument.Span);
}
}
Emit(PythonOpCode.CallUnpacked, 1, call.Span);
}
private void CompileComprehension(
PythonExpression comprehension,
string name,
IReadOnlyList<PythonComprehensionClause> clauses
)
{
if (clauses.Count == 0 || clauses[0] is not PythonComprehensionForClause firstClause)
{
Report(
"DPY3002",
"The comprehension is missing its leading 'for' clause.",
comprehension.Span
);
Emit(
PythonOpCode.LoadConstant,
AddConstant(new PythonConstant(PythonConstantType.NoneValue, null)),
comprehension.Span
);
return;
}
var childScope = _scope.Children.Single(scope =>
ReferenceEquals(scope.Definition, comprehension)
);
var childCompiler = new Compiler(
name,
childScope,
_diagnostics,
_enableReturnLocal,
_enableCallLocal
);
var childCode = childCompiler.CompileComprehensionCode(comprehension, clauses);
var constantIndex = AddConstant(
new PythonConstant(PythonConstantType.CodeObject, childCode)
);
Emit(PythonOpCode.MakeFunction, constantIndex, comprehension.Span);
CompileExpression(firstClause.Iterable);
Emit(PythonOpCode.GetIterator, 0, firstClause.Iterable.Span);
Emit(PythonOpCode.Call, 1, comprehension.Span);
}
private PythonCodeObject CompileComprehensionCode(
PythonExpression comprehension,
IReadOnlyList<PythonComprehensionClause> clauses
)
{
if (comprehension is not PythonGeneratorExpression)
{
Emit(
comprehension switch
{
PythonDictionaryComprehensionExpression => PythonOpCode.BuildDictionary,
PythonSetComprehensionExpression => PythonOpCode.BuildSet,
_ => PythonOpCode.BuildList,
},
0,
comprehension.Span
);
}
Emit(PythonOpCode.LoadLocal, GetVariableIndex(".0"), comprehension.Span);
Emit(PythonOpCode.GetIterator, 0, comprehension.Span);
CompileComprehensionClauses(
comprehension,
clauses,
clauseIndex: 0,
iteratorDepth: 0,
innermostLoopStart: 0
);
if (comprehension is PythonGeneratorExpression)
{
Emit(PythonOpCode.ReturnNone, 0, comprehension.Span);
}
else
{
Emit(PythonOpCode.ReturnValue, 0, comprehension.Span);
}
return CreateCodeObject(null, comprehension is PythonGeneratorExpression);
}
private void CompileComprehensionClauses(
PythonExpression comprehension,
IReadOnlyList<PythonComprehensionClause> clauses,
int clauseIndex,
int iteratorDepth,
int innermostLoopStart
)
{
if (clauseIndex == clauses.Count)
{
switch (comprehension)
{
case PythonListComprehensionExpression listComprehension:
CompileExpression(listComprehension.Element);
Emit(
PythonOpCode.ListAppend,
iteratorDepth,
listComprehension.Element.Span
);
break;
case PythonDictionaryComprehensionExpression dictionaryComprehension:
CompileExpression(dictionaryComprehension.Key);
CompileExpression(dictionaryComprehension.Value);
Emit(
PythonOpCode.DictionaryAdd,
iteratorDepth,
dictionaryComprehension.Span
);
break;
case PythonSetComprehensionExpression setComprehension:
CompileExpression(setComprehension.Element);
Emit(PythonOpCode.SetAdd, iteratorDepth, setComprehension.Element.Span);
break;
case PythonGeneratorExpression generatorExpression:
CompileExpression(generatorExpression.Element);
Emit(PythonOpCode.Yield, 0, generatorExpression.Element.Span);
Emit(PythonOpCode.PopTop, 0, generatorExpression.Element.Span);
break;
}
return;
}
switch (clauses[clauseIndex])
{
case PythonComprehensionForClause forClause:
if (clauseIndex != 0)
{
CompileExpression(forClause.Iterable);
Emit(PythonOpCode.GetIterator, 0, forClause.Iterable.Span);
}
var loopStart = _instructions.Count;
var exitJump = Emit(PythonOpCode.ForIter, 0, forClause.Span);
CompileAssignmentTarget(forClause.Target);
CompileComprehensionClauses(
comprehension,
clauses,
clauseIndex + 1,
iteratorDepth + 1,
loopStart
);