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196 lines (161 loc) · 7.23 KB
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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* [email protected]. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System.Linq.Expressions;
using Microsoft.Scripting.Ast;
using MSAst = System.Linq.Expressions;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using Microsoft.Scripting;
using Microsoft.Scripting.Generation;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
using IronPython.Compiler.Ast;
using IronPython.Runtime;
using IronPython.Runtime.Operations;
namespace IronPython.Compiler {
/// <summary>
/// Represents a script code which can be dynamically bound to execute against
/// arbitrary Scope objects. This is used for code when the user runs against
/// a particular scope as well as for exec and eval code as well. It is also
/// used when tracing is enabled.
/// </summary>
class PythonScriptCode : RunnableScriptCode {
private CodeContext _defaultContext;
private LookupCompilationDelegate/*!*/ _target, _tracingTarget; // lazily compiled targets
public PythonScriptCode(PythonAst/*!*/ ast)
: base(ast) {
Assert.NotNull(ast);
Debug.Assert(ast.Type == typeof(Expression<LookupCompilationDelegate>));
}
public override object Run() {
if (SourceUnit.Kind == SourceCodeKind.Expression) {
return EvalWrapper(DefaultContext);
}
return RunWorker(DefaultContext);
}
public override object Run(Scope scope) {
CodeContext ctx = GetContextForScope(scope, SourceUnit);
if (SourceUnit.Kind == SourceCodeKind.Expression) {
return EvalWrapper(ctx);
}
return RunWorker(ctx);
}
private object RunWorker(CodeContext ctx) {
LookupCompilationDelegate target = GetTarget(true);
Exception e = PythonOps.SaveCurrentException();
PushFrame(ctx, _code);
try {
return target(ctx, _code);
} finally {
PythonOps.RestoreCurrentException(e);
PopFrame();
}
}
private LookupCompilationDelegate GetTarget(bool register) {
LookupCompilationDelegate target;
PythonContext pc = (PythonContext)Ast.CompilerContext.SourceUnit.LanguageContext;
if (!pc.EnableTracing) {
EnsureTarget(register);
target = _target;
} else {
EnsureTracingTarget();
target = _tracingTarget;
}
return target;
}
public override FunctionCode GetFunctionCode(bool register) {
GetTarget(register);
return _code;
}
public override Scope/*!*/ CreateScope() {
return new Scope();
}
// wrapper so we can do minimal code gen for eval code
private object EvalWrapper(CodeContext ctx) {
try {
return RunWorker(ctx);
} catch (Exception e) {
PythonOps.UpdateStackTrace(e, ctx, Code, 0);
throw;
}
}
private LookupCompilationDelegate CompileBody(LightExpression<LookupCompilationDelegate> lambda) {
LookupCompilationDelegate func;
var extractConstant = ExtractConstant(lambda);
if (extractConstant != null) {
// skip compiling for really simple code
object value = extractConstant.Value;
return (codeCtx, functionCode) => value;
}
PythonContext pc = (PythonContext)Ast.CompilerContext.SourceUnit.LanguageContext;
if (ShouldInterpret(pc)) {
func = lambda.Compile(pc.Options.CompilationThreshold);
} else {
func = lambda.ReduceToLambda().Compile(pc.EmitDebugSymbols(Ast.CompilerContext.SourceUnit));
}
return func;
}
private bool ShouldInterpret(PythonContext pc) {
return pc.ShouldInterpret((PythonCompilerOptions)Ast.CompilerContext.Options, Ast.CompilerContext.SourceUnit);
}
private static PythonConstantExpression ExtractConstant(LightExpression<LookupCompilationDelegate> lambda) {
var body = lambda.Body as BlockExpression;
if (body == null ||
body.Expressions.Count != 2 ||
!(body.Expressions[0] is DebugInfoExpression) ||
body.Expressions[1].NodeType != ExpressionType.Convert ||
!(((MSAst.UnaryExpression)body.Expressions[1]).Operand is PythonConstantExpression)) {
return null;
}
return (PythonConstantExpression)((MSAst.UnaryExpression)body.Expressions[1]).Operand;
}
private void EnsureTarget(bool register) {
if (_target == null) {
_target = CompileBody((LightExpression<LookupCompilationDelegate>)Ast.GetLambda());
EnsureFunctionCode(_target, false, register);
}
}
private CodeContext DefaultContext {
get {
if (_defaultContext == null) {
_defaultContext = CreateTopLevelCodeContext(new PythonDictionary(), Ast.CompilerContext.SourceUnit.LanguageContext);
}
return _defaultContext;
}
}
private void EnsureTracingTarget() {
if (_tracingTarget == null) {
PythonContext pc = (PythonContext)Ast.CompilerContext.SourceUnit.LanguageContext;
var debugProperties = new PythonDebuggingPayload(null);
var debugInfo = new Microsoft.Scripting.Debugging.CompilerServices.DebugLambdaInfo(
null, // IDebugCompilerSupport
null, // lambda alias
false, // optimize for leaf frames
null, // hidden variables
null, // variable aliases
debugProperties // custom payload
);
var lambda = (Expression<LookupCompilationDelegate>)pc.DebugContext.TransformLambda((MSAst.LambdaExpression)Ast.GetLambda().Reduce(), debugInfo);
LookupCompilationDelegate func = ShouldInterpret(pc)
? lambda.LightCompile(pc.Options.CompilationThreshold)
: lambda.Compile(pc.EmitDebugSymbols(Ast.CompilerContext.SourceUnit));
_tracingTarget = func;
debugProperties.Code = EnsureFunctionCode(_tracingTarget, true, true);
}
}
}
}