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org.python.compiler.CodeCompiler Maven / Gradle / Ivy
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
// Copyright (c) Corporation for National Research Initiatives
package org.python.compiler;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.ListIterator;
import java.util.Map;
import java.util.Stack;
import java.util.Vector;
import org.python.antlr.ParseException;
import org.python.antlr.PythonTree;
import org.python.antlr.Visitor;
import org.python.antlr.ast.Assert;
import org.python.antlr.ast.Assign;
import org.python.antlr.ast.Attribute;
import org.python.antlr.ast.AugAssign;
import org.python.antlr.ast.BinOp;
import org.python.antlr.ast.BoolOp;
import org.python.antlr.ast.Break;
import org.python.antlr.ast.Call;
import org.python.antlr.ast.ClassDef;
import org.python.antlr.ast.Compare;
import org.python.antlr.ast.Continue;
import org.python.antlr.ast.Delete;
import org.python.antlr.ast.Dict;
import org.python.antlr.ast.DictComp;
import org.python.antlr.ast.Ellipsis;
import org.python.antlr.ast.ExceptHandler;
import org.python.antlr.ast.Exec;
import org.python.antlr.ast.Expr;
import org.python.antlr.ast.Expression;
import org.python.antlr.ast.ExtSlice;
import org.python.antlr.ast.For;
import org.python.antlr.ast.FunctionDef;
import org.python.antlr.ast.GeneratorExp;
import org.python.antlr.ast.Global;
import org.python.antlr.ast.If;
import org.python.antlr.ast.IfExp;
import org.python.antlr.ast.Import;
import org.python.antlr.ast.ImportFrom;
import org.python.antlr.ast.Index;
import org.python.antlr.ast.Interactive;
import org.python.antlr.ast.Lambda;
import org.python.antlr.ast.List;
import org.python.antlr.ast.ListComp;
import org.python.antlr.ast.Name;
import org.python.antlr.ast.Num;
import org.python.antlr.ast.Pass;
import org.python.antlr.ast.Print;
import org.python.antlr.ast.Raise;
import org.python.antlr.ast.Repr;
import org.python.antlr.ast.Return;
import org.python.antlr.ast.Set;
import org.python.antlr.ast.SetComp;
import org.python.antlr.ast.Slice;
import org.python.antlr.ast.Str;
import org.python.antlr.ast.Subscript;
import org.python.antlr.ast.Suite;
import org.python.antlr.ast.TryExcept;
import org.python.antlr.ast.TryFinally;
import org.python.antlr.ast.Tuple;
import org.python.antlr.ast.UnaryOp;
import org.python.antlr.ast.While;
import org.python.antlr.ast.With;
import org.python.antlr.ast.Yield;
import org.python.antlr.ast.alias;
import org.python.antlr.ast.cmpopType;
import org.python.antlr.ast.comprehension;
import org.python.antlr.ast.expr_contextType;
import org.python.antlr.ast.keyword;
import org.python.antlr.ast.operatorType;
import org.python.antlr.base.expr;
import org.python.antlr.base.mod;
import org.python.antlr.base.stmt;
import org.python.core.CompilerFlags;
import org.python.core.ContextGuard;
import org.python.core.ContextManager;
import org.python.core.imp;
import org.python.core.Py;
import org.python.core.PyCode;
import org.python.core.PyComplex;
import org.python.core.PyDictionary;
import org.python.core.PyException;
import org.python.core.PyFloat;
import org.python.core.PyFrame;
import org.python.core.PyFunction;
import org.python.core.PyInteger;
import org.python.core.PyList;
import org.python.core.PyLong;
import org.python.core.PyObject;
import org.python.core.PySet;
import org.python.core.PySlice;
import org.python.core.PyString;
import org.python.core.PyTuple;
import org.python.core.PyUnicode;
import org.python.core.ThreadState;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.Method;
import static org.python.util.CodegenUtils.*;
public class CodeCompiler extends Visitor implements Opcodes, ClassConstants {
private static final Object Exit = Integer.valueOf(1);
private static final Object NoExit = null;
private Module module;
private Code code;
private CompilerFlags cflags;
private int temporary;
private expr_contextType augmode;
private int augtmp1;
private int augtmp2;
private int augtmp3;
private int augtmp4;
private boolean fast_locals, print_results;
private Map tbl;
private ScopeInfo my_scope;
private boolean optimizeGlobals = true;
private String className;
private Stack continueLabels, breakLabels;
private Stack exceptionHandlers;
private Vector yields = new Vector();
/*
* break/continue finally's level. This is the lowest level in the exceptionHandlers which
* should be executed at break or continue. It is saved/updated/restored when compiling loops. A
* similar level for returns is not needed because a new CodeCompiler is used for each PyCode,
* in other words: each 'function'. When returning through finally's all the exceptionHandlers
* are executed.
*/
private int bcfLevel = 0;
private int yield_count = 0;
private Stack stack = new Stack();
public CodeCompiler(Module module, boolean print_results) {
this.module = module;
this.print_results = print_results;
continueLabels = new Stack();
breakLabels = new Stack();
exceptionHandlers = new Stack();
}
public void getNone() throws IOException {
code.getstatic(p(Py.class), "None", ci(PyObject.class));
}
public void loadFrame() throws Exception {
code.aload(1);
}
public void loadThreadState() throws Exception {
code.aload(2);
}
public void setLastI(int idx) throws Exception {
loadFrame();
code.iconst(idx);
code.putfield(p(PyFrame.class), "f_lasti", "I");
}
private void loadf_back() throws Exception {
code.getfield(p(PyFrame.class), "f_back", ci(PyFrame.class));
}
public int storeTop() throws Exception {
int tmp = code.getLocal(p(PyObject.class));
code.astore(tmp);
return tmp;
}
public void setline(int line) throws Exception {
if (module.linenumbers) {
code.setline(line);
loadFrame();
code.iconst(line);
code.invokevirtual(p(PyFrame.class), "setline", sig(Void.TYPE, Integer.TYPE));
}
}
public void setline(PythonTree node) throws Exception {
setline(node.getLineno());
}
public void set(PythonTree node) throws Exception {
int tmp = storeTop();
set(node, tmp);
code.aconst_null();
code.astore(tmp);
code.freeLocal(tmp);
}
public void set(PythonTree node, int tmp) throws Exception {
temporary = tmp;
visit(node);
}
private void saveAugTmps(PythonTree node, int count) throws Exception {
if (count >= 4) {
augtmp4 = code.getLocal(ci(PyObject.class));
code.astore(augtmp4);
}
if (count >= 3) {
augtmp3 = code.getLocal(ci(PyObject.class));
code.astore(augtmp3);
}
if (count >= 2) {
augtmp2 = code.getLocal(ci(PyObject.class));
code.astore(augtmp2);
}
augtmp1 = code.getLocal(ci(PyObject.class));
code.astore(augtmp1);
code.aload(augtmp1);
if (count >= 2) {
code.aload(augtmp2);
}
if (count >= 3) {
code.aload(augtmp3);
}
if (count >= 4) {
code.aload(augtmp4);
}
}
private void restoreAugTmps(PythonTree node, int count) throws Exception {
code.aload(augtmp1);
code.freeLocal(augtmp1);
if (count == 1) {
return;
}
code.aload(augtmp2);
code.freeLocal(augtmp2);
if (count == 2) {
return;
}
code.aload(augtmp3);
code.freeLocal(augtmp3);
if (count == 3) {
return;
}
code.aload(augtmp4);
code.freeLocal(augtmp4);
}
static boolean checkOptimizeGlobals(boolean fast_locals, ScopeInfo scope) {
return fast_locals && !scope.exec && !scope.from_import_star;
}
void parse(mod node, Code code, boolean fast_locals, String className, Str classDoc,
boolean classBody, ScopeInfo scope, CompilerFlags cflags) throws Exception {
this.fast_locals = fast_locals;
this.className = className;
this.code = code;
this.cflags = cflags;
this.my_scope = scope;
this.tbl = scope.tbl;
// BEGIN preparse
if (classBody) {
// Set the class's __module__ to __name__. fails when there's no __name__
loadFrame();
code.ldc("__module__");
loadFrame();
code.ldc("__name__");
code.invokevirtual(p(PyFrame.class), "getname", sig(PyObject.class, String.class));
code.invokevirtual(p(PyFrame.class), "setlocal",
sig(Void.TYPE, String.class, PyObject.class));
if (classDoc != null) {
loadFrame();
code.ldc("__doc__");
visit(classDoc);
code.invokevirtual(p(PyFrame.class), "setlocal",
sig(Void.TYPE, String.class, PyObject.class));
}
}
Label genswitch = new Label();
if (my_scope.generator) {
code.goto_(genswitch);
}
Label start = new Label();
code.label(start);
int nparamcell = my_scope.jy_paramcells.size();
if (nparamcell > 0) {
java.util.List paramcells = my_scope.jy_paramcells;
for (int i = 0; i < nparamcell; i++) {
code.aload(1);
SymInfo syminf = tbl.get(paramcells.get(i));
code.iconst(syminf.locals_index);
code.iconst(syminf.env_index);
code.invokevirtual(p(PyFrame.class), "to_cell",
sig(Void.TYPE, Integer.TYPE, Integer.TYPE));
}
}
// END preparse
optimizeGlobals = checkOptimizeGlobals(fast_locals, my_scope);
if (my_scope.max_with_count > 0) {
// allocate for all the with-exits we will have in the frame;
// this allows yield and with to happily co-exist
loadFrame();
code.iconst(my_scope.max_with_count);
code.anewarray(p(PyObject.class));
code.putfield(p(PyFrame.class), "f_exits", ci(PyObject[].class));
}
Object exit = visit(node);
if (classBody) {
loadFrame();
code.invokevirtual(p(PyFrame.class), "getf_locals", sig(PyObject.class));
code.areturn();
} else {
if (exit == null) {
setLastI(-1);
getNone();
code.areturn();
}
}
// BEGIN postparse
// similar to visitResume code in pyasm.py
if (my_scope.generator) {
code.label(genswitch);
code.aload(1);
code.getfield(p(PyFrame.class), "f_lasti", "I");
Label[] y = new Label[yields.size() + 1];
y[0] = start;
for (int i = 1; i < y.length; i++) {
y[i] = yields.get(i - 1);
}
code.tableswitch(0, y.length - 1, start, y);
}
// END postparse
}
@Override
public Object visitInteractive(Interactive node) throws Exception {
traverse(node);
return null;
}
@Override
public Object visitModule(org.python.antlr.ast.Module suite) throws Exception {
Str docStr = getDocStr(suite.getInternalBody());
if (docStr != null) {
loadFrame();
code.ldc("__doc__");
visit(docStr);
code.invokevirtual(p(PyFrame.class), "setglobal",
sig(Void.TYPE, String.class, PyObject.class));
}
traverse(suite);
return null;
}
@Override
public Object visitExpression(Expression node) throws Exception {
if (my_scope.generator && node.getInternalBody() != null) {
module.error("'return' with argument inside generator", true, node);
}
return visitReturn(new Return(node, node.getInternalBody()), true);
}
public void loadArray(Code code, java.util.List nodes) throws Exception {
final int n;
if (nodes == null) {
n = 0;
} else {
n = nodes.size();
}
if (n == 0) {
code.getstatic(p(Py.class), "EmptyObjects", ci(PyObject[].class));
return;
} else if (module.emitPrimitiveArraySetters(nodes, code)) {
return;
}
code.iconst(n);
code.anewarray(p(PyObject.class));
for (int i = 0; i < n; i++) {
code.dup();
code.iconst(i);
visit(nodes.get(i));
code.aastore();
}
}
public int makeArray(java.util.List nodes) throws Exception {
final int n;
if (nodes == null) {
n = 0;
} else {
n = nodes.size();
}
int array = code.getLocal(ci(PyObject[].class));
if (n == 0) {
code.getstatic(p(Py.class), "EmptyObjects", ci(PyObject[].class));
code.astore(array);
} else {
code.iconst(n);
code.anewarray(p(PyObject.class));
code.astore(array);
for (int i = 0; i < n; i++) {
visit(nodes.get(i));
code.aload(array);
code.swap();
code.iconst(i);
code.swap();
code.aastore();
}
}
return array;
}
// nulls out an array of references
public void freeArray(int array) {
code.aload(array);
code.aconst_null();
code.invokestatic(p(Arrays.class), "fill", sig(Void.TYPE, Object[].class, Object.class));
code.freeLocal(array);
}
public void freeArrayRef(int array) {
code.aconst_null();
code.astore(array);
code.freeLocal(array);
}
public Str getDocStr(java.util.List suite) {
if (suite.size() > 0) {
stmt stmt = suite.get(0);
if (stmt instanceof Expr && ((Expr)stmt).getInternalValue() instanceof Str) {
return (Str)((Expr)stmt).getInternalValue();
}
}
return null;
}
public boolean makeClosure(ScopeInfo scope) throws Exception {
if (scope == null || scope.freevars == null) {
return false;
}
int n = scope.freevars.size();
if (n == 0) {
return false;
}
int tmp = code.getLocal(ci(PyObject[].class));
code.iconst(n);
code.anewarray(p(PyObject.class));
code.astore(tmp);
Map upTbl = scope.up.tbl;
for (int i = 0; i < n; i++) {
code.aload(tmp);
code.iconst(i);
loadFrame();
for (int j = 1; j < scope.distance; j++) {
loadf_back();
}
SymInfo symInfo = upTbl.get(scope.freevars.elementAt(i));
code.iconst(symInfo.env_index);
code.invokevirtual(p(PyFrame.class), "getclosure", sig(PyObject.class, Integer.TYPE));
code.aastore();
}
code.aload(tmp);
code.freeLocal(tmp);
return true;
}
@Override
public Object visitFunctionDef(FunctionDef node) throws Exception {
String name = getName(node.getInternalName());
setline(node);
ScopeInfo scope = module.getScopeInfo(node);
// NOTE: this is attached to the constructed PyFunction, so it cannot be nulled out
// with freeArray, unlike other usages of makeArray here
int defaults = makeArray(scope.ac.getDefaults());
code.new_(p(PyFunction.class));
code.dup();
loadFrame();
code.getfield(p(PyFrame.class), "f_globals", ci(PyObject.class));
code.aload(defaults);
code.freeLocal(defaults);
scope.setup_closure();
scope.dump();
module.codeConstant(new Suite(node, node.getInternalBody()), name, true, className, false,
false, node.getLineno(), scope, cflags).get(code);
Str docStr = getDocStr(node.getInternalBody());
if (docStr != null) {
visit(docStr);
} else {
code.aconst_null();
}
if (!makeClosure(scope)) {
code.invokespecial(p(PyFunction.class), "",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject.class));
} else {
code.invokespecial(
p(PyFunction.class),
"",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject.class,
PyObject[].class));
}
applyDecorators(node.getInternalDecorator_list());
set(new Name(node, node.getInternalName(), expr_contextType.Store));
return null;
}
private void applyDecorators(java.util.List decorators) throws Exception {
if (decorators != null && !decorators.isEmpty()) {
int res = storeTop();
for (expr decorator : decorators) {
visit(decorator);
stackProduce();
}
for (int i = decorators.size(); i > 0; i--) {
stackConsume();
loadThreadState();
code.aload(res);
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class));
code.astore(res);
}
code.aload(res);
code.freeLocal(res);
}
}
@Override
public Object visitExpr(Expr node) throws Exception {
setline(node);
visit(node.getInternalValue());
if (print_results) {
code.invokestatic(p(Py.class), "printResult", sig(Void.TYPE, PyObject.class));
} else {
code.pop();
}
return null;
}
@Override
public Object visitAssign(Assign node) throws Exception {
setline(node);
visit(node.getInternalValue());
if (node.getInternalTargets().size() == 1) {
set(node.getInternalTargets().get(0));
} else {
int tmp = storeTop();
for (expr target : node.getInternalTargets()) {
set(target, tmp);
}
code.freeLocal(tmp);
}
return null;
}
@Override
public Object visitPrint(Print node) throws Exception {
setline(node);
int tmp = -1;
if (node.getInternalDest() != null) {
visit(node.getInternalDest());
tmp = storeTop();
}
if (node.getInternalValues() == null || node.getInternalValues().size() == 0) {
if (node.getInternalDest() != null) {
code.aload(tmp);
code.invokestatic(p(Py.class), "printlnv", sig(Void.TYPE, PyObject.class));
} else {
code.invokestatic(p(Py.class), "println", sig(Void.TYPE));
}
} else {
for (int i = 0; i < node.getInternalValues().size(); i++) {
if (node.getInternalDest() != null) {
code.aload(tmp);
visit(node.getInternalValues().get(i));
if (node.getInternalNl() && i == node.getInternalValues().size() - 1) {
code.invokestatic(p(Py.class), "println",
sig(Void.TYPE, PyObject.class, PyObject.class));
} else {
code.invokestatic(p(Py.class), "printComma",
sig(Void.TYPE, PyObject.class, PyObject.class));
}
} else {
visit(node.getInternalValues().get(i));
if (node.getInternalNl() && i == node.getInternalValues().size() - 1) {
code.invokestatic(p(Py.class), "println", sig(Void.TYPE, PyObject.class));
} else {
code.invokestatic(p(Py.class), "printComma", sig(Void.TYPE, PyObject.class));
}
}
}
}
if (node.getInternalDest() != null) {
code.freeLocal(tmp);
}
return null;
}
@Override
public Object visitDelete(Delete node) throws Exception {
setline(node);
traverse(node);
return null;
}
@Override
public Object visitPass(Pass node) throws Exception {
setline(node);
return null;
}
@Override
public Object visitBreak(Break node) throws Exception {
// setline(node); Not needed here...
if (breakLabels.empty()) {
throw new ParseException("'break' outside loop", node);
}
doFinallysDownTo(bcfLevel);
code.goto_(breakLabels.peek());
return null;
}
@Override
public Object visitContinue(Continue node) throws Exception {
// setline(node); Not needed here...
if (continueLabels.empty()) {
throw new ParseException("'continue' not properly in loop", node);
}
doFinallysDownTo(bcfLevel);
code.goto_(continueLabels.peek());
return Exit;
}
@Override
public Object visitYield(Yield node) throws Exception {
setline(node);
if (!fast_locals) {
throw new ParseException("'yield' outside function", node);
}
int stackState = saveStack();
if (node.getInternalValue() != null) {
visit(node.getInternalValue());
} else {
getNone();
}
setLastI(++yield_count);
saveLocals();
code.areturn();
Label restart = new Label();
yields.addElement(restart);
code.label(restart);
restoreLocals();
restoreStack(stackState);
loadFrame();
code.invokevirtual(p(PyFrame.class), "getGeneratorInput", sig(Object.class));
code.dup();
code.instanceof_(p(PyException.class));
Label done2 = new Label();
code.ifeq(done2);
code.checkcast(p(Throwable.class));
code.athrow();
code.label(done2);
code.checkcast(p(PyObject.class));
return null;
}
private void stackProduce() {
stackProduce(p(PyObject.class));
}
private void stackProduce(String signature) {
stack.push(signature);
}
private void stackConsume() {
stackConsume(1);
}
private void stackConsume(int numItems) {
for (int i = 0; i < numItems; i++) {
stack.pop();
}
}
private int saveStack() throws Exception {
if (stack.size() > 0) {
int array = code.getLocal(ci(Object[].class));
code.iconst(stack.size());
code.anewarray(p(Object.class));
code.astore(array);
ListIterator content = stack.listIterator(stack.size());
for (int i = 0; content.hasPrevious(); i++) {
String signature = content.previous();
if (p(ThreadState.class).equals(signature)) {
// Stack: ... threadstate
code.pop();
// Stack: ...
} else {
code.aload(array);
// Stack: |- ... value array
code.swap();
code.iconst(i++);
code.swap();
// Stack: |- ... array index value
code.aastore();
// Stack: |- ...
}
}
return array;
} else {
return -1;
}
}
private void restoreStack(int array) throws Exception {
if (stack.size() > 0) {
int i = stack.size() - 1;
for (String signature : stack) {
if (p(ThreadState.class).equals(signature)) {
loadThreadState();
} else {
code.aload(array);
// Stack: |- ... array
code.iconst(i--);
code.aaload();
// Stack: |- ... value
code.checkcast(signature);
}
}
code.freeLocal(array);
}
}
private void restoreLocals() throws Exception {
endExceptionHandlers();
Vector v = code.getActiveLocals();
loadFrame();
code.getfield(p(PyFrame.class), "f_savedlocals", ci(Object[].class));
int locals = code.getLocal(ci(Object[].class));
code.astore(locals);
for (int i = 0; i < v.size(); i++) {
String type = v.elementAt(i);
if (type == null) {
continue;
}
code.aload(locals);
code.iconst(i);
code.aaload();
code.checkcast(type);
code.astore(i);
}
code.freeLocal(locals);
restartExceptionHandlers();
}
/**
* Close all the open exception handler ranges. This should be paired with
* restartExceptionHandlers to delimit internal code that shouldn't be handled by user handlers.
* This allows us to set variables without the verifier thinking we might jump out of our
* handling with an exception.
*/
private void endExceptionHandlers() {
Label end = new Label();
code.label(end);
for (int i = 0; i < exceptionHandlers.size(); ++i) {
ExceptionHandler handler = exceptionHandlers.elementAt(i);
handler.exceptionEnds.addElement(end);
}
}
private void restartExceptionHandlers() {
Label start = new Label();
code.label(start);
for (int i = 0; i < exceptionHandlers.size(); ++i) {
ExceptionHandler handler = exceptionHandlers.elementAt(i);
handler.exceptionStarts.addElement(start);
}
}
private void saveLocals() throws Exception {
Vector v = code.getActiveLocals();
code.iconst(v.size());
code.anewarray(p(Object.class));
int locals = code.getLocal(ci(Object[].class));
code.astore(locals);
for (int i = 0; i < v.size(); i++) {
String type = v.elementAt(i);
if (type == null) {
continue;
}
code.aload(locals);
code.iconst(i);
// code.checkcast(code.pool.Class(p(Object.class)));
if (i == 2222) {
code.aconst_null();
} else {
code.aload(i);
}
code.aastore();
}
loadFrame();
code.aload(locals);
code.putfield(p(PyFrame.class), "f_savedlocals", ci(Object[].class));
code.freeLocal(locals);
}
@Override
public Object visitReturn(Return node) throws Exception {
return visitReturn(node, false);
}
public Object visitReturn(Return node, boolean inEval) throws Exception {
setline(node);
if (!inEval && !fast_locals) {
throw new ParseException("'return' outside function", node);
}
int tmp = 0;
if (node.getInternalValue() != null) {
if (my_scope.generator && !(node instanceof LambdaSyntheticReturn)) {
throw new ParseException("'return' with argument " + "inside generator", node);
}
visit(node.getInternalValue());
tmp = code.getReturnLocal();
code.astore(tmp);
}
doFinallysDownTo(0);
setLastI(-1);
if (node.getInternalValue() != null) {
code.aload(tmp);
} else {
getNone();
}
code.areturn();
return Exit;
}
@Override
public Object visitRaise(Raise node) throws Exception {
setline(node);
if (node.getInternalType() != null) {
visit(node.getInternalType());
stackProduce();
}
if (node.getInternalInst() != null) {
visit(node.getInternalInst());
stackProduce();
}
if (node.getInternalTback() != null) {
visit(node.getInternalTback());
stackProduce();
}
if (node.getInternalType() == null) {
code.invokestatic(p(Py.class), "makeException", sig(PyException.class));
} else if (node.getInternalInst() == null) {
stackConsume();
code.invokestatic(p(Py.class), "makeException", sig(PyException.class, PyObject.class));
} else if (node.getInternalTback() == null) {
stackConsume(2);
code.invokestatic(p(Py.class), "makeException",
sig(PyException.class, PyObject.class, PyObject.class));
} else {
stackConsume(3);
code.invokestatic(p(Py.class), "makeException",
sig(PyException.class, PyObject.class, PyObject.class, PyObject.class));
}
code.athrow();
return Exit;
}
/**
* Return the implied import level, which is different from the argument only if the argument is
* zero (no leading dots) meaning try relative then absolute (in Python 2), signified by
* returning level -1.
*/
private int impliedImportLevel(int level) {
// already prepared for a future change of DEFAULT_LEVEL
if (imp.DEFAULT_LEVEL == 0 || level != 0 || module.getFutures().isAbsoluteImportOn()) {
return level;
} else {
return imp.DEFAULT_LEVEL;
}
}
@Override
public Object visitImport(Import node) throws Exception {
setline(node);
for (alias a : node.getInternalNames()) {
String asname = null;
if (a.getInternalAsname() != null) {
String name = a.getInternalName();
asname = a.getInternalAsname();
code.ldc(name);
loadFrame();
code.iconst(impliedImportLevel(0));
code.invokestatic(p(imp.class), "importOneAs",
sig(PyObject.class, String.class, PyFrame.class, Integer.TYPE));
} else {
String name = a.getInternalName();
asname = name;
if (asname.indexOf('.') > 0) {
asname = asname.substring(0, asname.indexOf('.'));
}
code.ldc(name);
loadFrame();
code.iconst(impliedImportLevel(0));
code.invokestatic(p(imp.class), "importOne",
sig(PyObject.class, String.class, PyFrame.class, Integer.TYPE));
}
set(new Name(a, asname, expr_contextType.Store));
}
return null;
}
@Override
public Object visitImportFrom(ImportFrom node) throws Exception {
Future.checkFromFuture(node); // future stmt support
setline(node);
code.ldc(node.getInternalModule());
java.util.List aliases = node.getInternalNames();
if (aliases == null || aliases.size() == 0) {
throw new ParseException("Internel parser error", node);
} else if (aliases.size() == 1 && aliases.get(0).getInternalName().equals("*")) {
if (my_scope.func_level > 0) {
module.error("import * only allowed at module level", false, node);
if (my_scope.contains_ns_free_vars) {
module.error("import * is not allowed in function '" + my_scope.scope_name
+ "' because it contains a nested function with free variables", true,
node);
}
}
if (my_scope.func_level > 1) {
module.error("import * is not allowed in function '" + my_scope.scope_name
+ "' because it is a nested function", true, node);
}
loadFrame();
code.iconst(impliedImportLevel(node.getInternalLevel()));
code.invokestatic(p(imp.class), "importAll",
sig(Void.TYPE, String.class, PyFrame.class, Integer.TYPE));
} else {
java.util.List fromNames = new ArrayList(); // [names.size()];
java.util.List asnames = new ArrayList(); // [names.size()];
for (int i = 0; i < aliases.size(); i++) {
fromNames.add(aliases.get(i).getInternalName());
asnames.add(aliases.get(i).getInternalAsname());
if (asnames.get(i) == null) {
asnames.set(i, fromNames.get(i));
}
}
int strArray = makeStrings(code, fromNames);
code.aload(strArray);
code.freeLocal(strArray);
loadFrame();
code.iconst(impliedImportLevel(node.getInternalLevel()));
code.invokestatic(
p(imp.class),
"importFrom",
sig(PyObject[].class, String.class, String[].class, PyFrame.class, Integer.TYPE));
int tmp = storeTop();
for (int i = 0; i < aliases.size(); i++) {
code.aload(tmp);
code.iconst(i);
code.aaload();
set(new Name(aliases.get(i), asnames.get(i), expr_contextType.Store));
}
code.freeLocal(tmp);
}
return null;
}
@Override
public Object visitGlobal(Global node) throws Exception {
return null;
}
@Override
public Object visitExec(Exec node) throws Exception {
setline(node);
visit(node.getInternalBody());
stackProduce();
if (node.getInternalGlobals() != null) {
visit(node.getInternalGlobals());
} else {
code.aconst_null();
}
stackProduce();
if (node.getInternalLocals() != null) {
visit(node.getInternalLocals());
} else {
code.aconst_null();
}
stackProduce();
// do the real work here
stackConsume(3);
code.invokestatic(p(Py.class), "exec",
sig(Void.TYPE, PyObject.class, PyObject.class, PyObject.class));
return null;
}
@Override
public Object visitAssert(Assert node) throws Exception {
setline(node);
Label end_of_assert = new Label();
/* First do an if __debug__: */
loadFrame();
emitGetGlobal("__debug__");
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
code.ifeq(end_of_assert);
/*
* Now do the body of the assert. If PyObject.__nonzero__ is true, then the assertion
* succeeded, the message portion should not be processed. Otherwise, the message will be
* processed.
*/
visit(node.getInternalTest());
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
/* If evaluation is false, then branch to end of method */
code.ifne(end_of_assert);
/* Visit the message part of the assertion, or pass Py.None */
if (node.getInternalMsg() != null) {
visit(node.getInternalMsg());
} else {
getNone();
}
/* Push exception type onto stack(AssertionError) */
loadFrame();
emitGetGlobal("AssertionError");
code.swap(); // The type is the first argument, but the message could be a yield
code.invokestatic(p(Py.class), "makeException",
sig(PyException.class, PyObject.class, PyObject.class));
/* Raise assertion error. Only executes this logic if assertion failed */
code.athrow();
/* And finally set the label for the end of it all */
code.label(end_of_assert);
return null;
}
public Object doTest(Label end_of_if, If node, int index) throws Exception {
Label end_of_suite = new Label();
setline(node.getInternalTest());
visit(node.getInternalTest());
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
code.ifeq(end_of_suite);
Object exit = suite(node.getInternalBody());
if (end_of_if != null && exit == null) {
code.goto_(end_of_if);
}
code.label(end_of_suite);
if (node.getInternalOrelse() != null) {
return suite(node.getInternalOrelse()) != null ? exit : null;
} else {
return null;
}
}
@Override
public Object visitIf(If node) throws Exception {
Label end_of_if = null;
if (node.getInternalOrelse() != null) {
end_of_if = new Label();
}
Object exit = doTest(end_of_if, node, 0);
if (end_of_if != null) {
code.label(end_of_if);
}
return exit;
}
@Override
public Object visitIfExp(IfExp node) throws Exception {
setline(node.getInternalTest());
Label end = new Label();
Label end_of_else = new Label();
visit(node.getInternalTest());
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
code.ifeq(end_of_else);
visit(node.getInternalBody());
code.goto_(end);
code.label(end_of_else);
visit(node.getInternalOrelse());
code.label(end);
return null;
}
public int beginLoop() {
continueLabels.push(new Label());
breakLabels.push(new Label());
int savebcf = bcfLevel;
bcfLevel = exceptionHandlers.size();
return savebcf;
}
public void finishLoop(int savebcf) {
continueLabels.pop();
breakLabels.pop();
bcfLevel = savebcf;
}
@Override
public Object visitWhile(While node) throws Exception {
int savebcf = beginLoop();
Label continue_loop = continueLabels.peek();
Label break_loop = breakLabels.peek();
Label start_loop = new Label();
code.goto_(continue_loop);
code.label(start_loop);
// Do suite
suite(node.getInternalBody());
code.label(continue_loop);
setline(node);
// Do test
visit(node.getInternalTest());
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
code.ifne(start_loop);
finishLoop(savebcf);
if (node.getInternalOrelse() != null) {
// Do else
suite(node.getInternalOrelse());
}
code.label(break_loop);
// Probably need to detect "guaranteed exits"
return null;
}
@Override
public Object visitFor(For node) throws Exception {
int savebcf = beginLoop();
Label continue_loop = continueLabels.peek();
Label break_loop = breakLabels.peek();
Label start_loop = new Label();
Label next_loop = new Label();
setline(node);
// parse the list
visit(node.getInternalIter());
int iter_tmp = code.getLocal(p(PyObject.class));
int expr_tmp = code.getLocal(p(PyObject.class));
// set up the loop iterator
code.invokevirtual(p(PyObject.class), "__iter__", sig(PyObject.class));
code.astore(iter_tmp);
// do check at end of loop. Saves one opcode ;-)
code.goto_(next_loop);
code.label(start_loop);
// set iter variable to current entry in list
set(node.getInternalTarget(), expr_tmp);
// evaluate for body
suite(node.getInternalBody());
code.label(continue_loop);
code.label(next_loop);
setline(node);
// get the next element from the list
code.aload(iter_tmp);
code.invokevirtual(p(PyObject.class), "__iternext__", sig(PyObject.class));
code.astore(expr_tmp);
code.aload(expr_tmp);
// if no more elements then fall through
code.ifnonnull(start_loop);
finishLoop(savebcf);
if (node.getInternalOrelse() != null) {
// Do else clause if provided
suite(node.getInternalOrelse());
}
code.label(break_loop);
code.freeLocal(iter_tmp);
code.freeLocal(expr_tmp);
// Probably need to detect "guaranteed exits"
return null;
}
public void exceptionTest(int exc, Label end_of_exceptions, TryExcept node, int index)
throws Exception {
for (int i = 0; i < node.getInternalHandlers().size(); i++) {
ExceptHandler handler = (ExceptHandler)node.getInternalHandlers().get(i);
// setline(name);
Label end_of_self = new Label();
if (handler.getInternalType() != null) {
code.aload(exc);
// get specific exception
visit(handler.getInternalType());
code.invokevirtual(p(PyException.class), "match", sig(Boolean.TYPE, PyObject.class));
code.ifeq(end_of_self);
} else {
if (i != node.getInternalHandlers().size() - 1) {
throw new ParseException("default 'except:' must be last", handler);
}
}
if (handler.getInternalName() != null) {
code.aload(exc);
code.getfield(p(PyException.class), "value", ci(PyObject.class));
set(handler.getInternalName());
}
// do exception body
suite(handler.getInternalBody());
code.goto_(end_of_exceptions);
code.label(end_of_self);
}
code.aload(exc);
code.athrow();
}
@Override
public Object visitTryFinally(TryFinally node) throws Exception {
Label start = new Label();
Label end = new Label();
Label handlerStart = new Label();
Label finallyEnd = new Label();
Object ret;
ExceptionHandler inFinally = new ExceptionHandler(node);
// Do protected suite
exceptionHandlers.push(inFinally);
int excLocal = code.getLocal(p(Throwable.class));
code.aconst_null();
code.astore(excLocal);
code.label(start);
inFinally.exceptionStarts.addElement(start);
ret = suite(node.getInternalBody());
code.label(end);
inFinally.exceptionEnds.addElement(end);
inFinally.bodyDone = true;
exceptionHandlers.pop();
if (ret == NoExit) {
inlineFinally(inFinally);
code.goto_(finallyEnd);
}
// Handle any exceptions that get thrown in suite
code.label(handlerStart);
code.astore(excLocal);
code.aload(excLocal);
loadFrame();
code.invokestatic(p(Py.class), "addTraceback",
sig(Void.TYPE, Throwable.class, PyFrame.class));
inlineFinally(inFinally);
code.aload(excLocal);
code.checkcast(p(Throwable.class));
code.athrow();
code.label(finallyEnd);
code.freeLocal(excLocal);
inFinally.addExceptionHandlers(handlerStart);
// According to any JVM verifiers, this code block might not return
return null;
}
private void inlineFinally(ExceptionHandler handler) throws Exception {
if (!handler.bodyDone) {
// end the previous exception block so inlined finally code doesn't
// get covered by our exception handler.
Label end = new Label();
code.label(end);
handler.exceptionEnds.addElement(end);
// also exiting the try: portion of this particular finally
}
if (handler.isFinallyHandler()) {
handler.finalBody(this);
}
}
private void reenterProtectedBody(ExceptionHandler handler) throws Exception {
// restart exception coverage
Label restart = new Label();
code.label(restart);
handler.exceptionStarts.addElement(restart);
}
/**
* Inline the finally handling code for levels down to the levelth parent (0 means all). This
* takes care to avoid having more nested finallys catch exceptions throw by the parent finally
* code. This also pops off all the handlers above level temporarily.
*/
private void doFinallysDownTo(int level) throws Exception {
Stack poppedHandlers = new Stack();
while (exceptionHandlers.size() > level) {
ExceptionHandler handler = exceptionHandlers.pop();
inlineFinally(handler);
poppedHandlers.push(handler);
}
while (poppedHandlers.size() > 0) {
ExceptionHandler handler = poppedHandlers.pop();
reenterProtectedBody(handler);
exceptionHandlers.push(handler);
}
}
@Override
public Object visitTryExcept(TryExcept node) throws Exception {
Label start = new Label();
Label end = new Label();
Label handler_start = new Label();
Label handler_end = new Label();
ExceptionHandler handler = new ExceptionHandler();
code.label(start);
handler.exceptionStarts.addElement(start);
exceptionHandlers.push(handler);
// Do suite
Object exit = suite(node.getInternalBody());
exceptionHandlers.pop();
code.label(end);
handler.exceptionEnds.addElement(end);
if (exit == null) {
code.goto_(handler_end);
}
code.label(handler_start);
loadFrame();
code.invokestatic(p(Py.class), "setException",
sig(PyException.class, Throwable.class, PyFrame.class));
int exc = code.getFinallyLocal(p(Throwable.class));
code.astore(exc);
if (node.getInternalOrelse() == null) {
// No else clause to worry about
exceptionTest(exc, handler_end, node, 1);
code.label(handler_end);
} else {
// Have else clause
Label else_end = new Label();
exceptionTest(exc, else_end, node, 1);
code.label(handler_end);
// do else clause
suite(node.getInternalOrelse());
code.label(else_end);
}
code.freeFinallyLocal(exc);
handler.addExceptionHandlers(handler_start);
return null;
}
@Override
public Object visitSuite(Suite node) throws Exception {
return suite(node.getInternalBody());
}
public Object suite(java.util.List stmts) throws Exception {
for (stmt s : stmts) {
Object exit = visit(s);
if (exit != null) {
return Exit;
}
}
return null;
}
@Override
public Object visitBoolOp(BoolOp node) throws Exception {
Label end = new Label();
visit(node.getInternalValues().get(0));
for (int i = 1; i < node.getInternalValues().size(); i++) {
code.dup();
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
switch (node.getInternalOp()) {
case Or:
code.ifne(end);
break;
case And:
code.ifeq(end);
break;
}
code.pop();
visit(node.getInternalValues().get(i));
}
code.label(end);
return null;
}
@Override
public Object visitCompare(Compare node) throws Exception {
int last = code.getLocal(p(PyObject.class));
int result = code.getLocal(p(PyObject.class));
Label end = new Label();
visit(node.getInternalLeft());
code.astore(last);
int n = node.getInternalOps().size();
for (int i = 0; i < n - 1; i++) {
visit(node.getInternalComparators().get(i));
code.aload(last);
code.swap();
code.dup();
code.astore(last);
visitCmpop(node.getInternalOps().get(i));
code.dup();
code.astore(result);
code.invokevirtual(p(PyObject.class), "__nonzero__", sig(Boolean.TYPE));
code.ifeq(end);
}
visit(node.getInternalComparators().get(n - 1));
code.aload(last);
code.swap();
visitCmpop(node.getInternalOps().get(n - 1));
if (n > 1) {
code.astore(result);
code.label(end);
code.aload(result);
}
code.aconst_null();
code.astore(last);
code.freeLocal(last);
code.freeLocal(result);
return null;
}
public void visitCmpop(cmpopType op) throws Exception {
String name = null;
switch (op) {
case Eq:
name = "_eq";
break;
case NotEq:
name = "_ne";
break;
case Lt:
name = "_lt";
break;
case LtE:
name = "_le";
break;
case Gt:
name = "_gt";
break;
case GtE:
name = "_ge";
break;
case Is:
name = "_is";
break;
case IsNot:
name = "_isnot";
break;
case In:
name = "_in";
break;
case NotIn:
name = "_notin";
break;
}
code.invokevirtual(p(PyObject.class), name, sig(PyObject.class, PyObject.class));
}
@Override
public Object visitBinOp(BinOp node) throws Exception {
visit(node.getInternalLeft());
stackProduce();
visit(node.getInternalRight());
stackConsume();
String name = null;
switch (node.getInternalOp()) {
case Add:
name = "_add";
break;
case Sub:
name = "_sub";
break;
case Mult:
name = "_mul";
break;
case Div:
name = "_div";
break;
case Mod:
name = "_mod";
break;
case Pow:
name = "_pow";
break;
case LShift:
name = "_lshift";
break;
case RShift:
name = "_rshift";
break;
case BitOr:
name = "_or";
break;
case BitXor:
name = "_xor";
break;
case BitAnd:
name = "_and";
break;
case FloorDiv:
name = "_floordiv";
break;
}
if (node.getInternalOp() == operatorType.Div && module.getFutures().areDivisionOn()) {
name = "_truediv";
}
code.invokevirtual(p(PyObject.class), name, sig(PyObject.class, PyObject.class));
return null;
}
@Override
public Object visitUnaryOp(UnaryOp node) throws Exception {
visit(node.getInternalOperand());
String name = null;
switch (node.getInternalOp()) {
case Invert:
name = "__invert__";
break;
case Not:
name = "__not__";
break;
case UAdd:
name = "__pos__";
break;
case USub:
name = "__neg__";
break;
}
code.invokevirtual(p(PyObject.class), name, sig(PyObject.class));
return null;
}
@Override
public Object visitAugAssign(AugAssign node) throws Exception {
setline(node);
augmode = expr_contextType.Load;
visit(node.getInternalTarget());
int target = storeTop();
visit(node.getInternalValue());
code.aload(target);
code.swap();
String name = null;
switch (node.getInternalOp()) {
case Add:
name = "_iadd";
break;
case Sub:
name = "_isub";
break;
case Mult:
name = "_imul";
break;
case Div:
name = "_idiv";
break;
case Mod:
name = "_imod";
break;
case Pow:
name = "_ipow";
break;
case LShift:
name = "_ilshift";
break;
case RShift:
name = "_irshift";
break;
case BitOr:
name = "_ior";
break;
case BitXor:
name = "_ixor";
break;
case BitAnd:
name = "_iand";
break;
case FloorDiv:
name = "_ifloordiv";
break;
}
if (node.getInternalOp() == operatorType.Div && module.getFutures().areDivisionOn()) {
name = "_itruediv";
}
code.invokevirtual(p(PyObject.class), name, sig(PyObject.class, PyObject.class));
code.freeLocal(target);
temporary = storeTop();
augmode = expr_contextType.Store;
visit(node.getInternalTarget());
code.freeLocal(temporary);
return null;
}
static int makeStrings(Code c, Collection names) throws IOException {
if (names != null) {
c.iconst(names.size());
} else {
c.iconst_0();
}
c.anewarray(p(String.class));
int strings = c.getLocal(ci(String[].class));
c.astore(strings);
if (names != null) {
int i = 0;
for (String name : names) {
c.aload(strings);
c.iconst(i);
c.ldc(name);
c.aastore();
i++;
}
}
return strings;
}
public Object invokeNoKeywords(Attribute node, java.util.List values) throws Exception {
String name = getName(node.getInternalAttr());
visit(node.getInternalValue());
stackProduce();
code.ldc(name);
code.invokevirtual(p(PyObject.class), "__getattr__", sig(PyObject.class, String.class));
loadThreadState();
stackProduce(p(ThreadState.class));
switch (values.size()) {
case 0:
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class));
break;
case 1:
visit(values.get(0));
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class));
break;
case 2:
visit(values.get(0));
stackProduce();
visit(values.get(1));
stackConsume(3); // target + ts + arguments
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class, PyObject.class));
break;
case 3:
visit(values.get(0));
stackProduce();
visit(values.get(1));
stackProduce();
visit(values.get(2));
stackConsume(4); // target + ts + arguments
code.invokevirtual(
p(PyObject.class),
"__call__",
sig(PyObject.class, ThreadState.class, PyObject.class, PyObject.class,
PyObject.class));
break;
case 4:
visit(values.get(0));
stackProduce();
visit(values.get(1));
stackProduce();
visit(values.get(2));
stackProduce();
visit(values.get(3));
stackConsume(5); // target + ts + arguments
code.invokevirtual(
p(PyObject.class),
"__call__",
sig(PyObject.class, ThreadState.class, PyObject.class, PyObject.class,
PyObject.class, PyObject.class));
break;
default:
int argArray = makeArray(values);
code.aload(argArray);
code.freeLocal(argArray);
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject[].class));
break;
}
return null;
}
@Override
public Object visitCall(Call node) throws Exception {
java.util.List keys = new ArrayList();
java.util.List values = new ArrayList();
for (int i = 0; i < node.getInternalArgs().size(); i++) {
values.add(node.getInternalArgs().get(i));
}
for (int i = 0; i < node.getInternalKeywords().size(); i++) {
keys.add(node.getInternalKeywords().get(i).getInternalArg());
values.add(node.getInternalKeywords().get(i).getInternalValue());
}
if ((node.getInternalKeywords() == null || node.getInternalKeywords().size() == 0)
&& node.getInternalStarargs() == null && node.getInternalKwargs() == null
&& node.getInternalFunc() instanceof Attribute) {
return invokeNoKeywords((Attribute)node.getInternalFunc(), values);
}
visit(node.getInternalFunc());
stackProduce();
if (node.getInternalStarargs() != null || node.getInternalKwargs() != null) {
int argArray = makeArray(values);
int strArray = makeStrings(code, keys);
if (node.getInternalStarargs() == null) {
code.aconst_null();
} else {
visit(node.getInternalStarargs());
}
stackProduce();
if (node.getInternalKwargs() == null) {
code.aconst_null();
} else {
visit(node.getInternalKwargs());
}
stackProduce();
code.aload(argArray);
code.aload(strArray);
code.freeLocal(strArray);
code.dup2_x2();
code.pop2();
stackConsume(3); // target + starargs + kwargs
code.invokevirtual(
p(PyObject.class),
"_callextra",
sig(PyObject.class, PyObject[].class, String[].class, PyObject.class,
PyObject.class));
freeArrayRef(argArray);
} else if (keys.size() > 0) {
loadThreadState();
stackProduce(p(ThreadState.class));
int argArray = makeArray(values);
int strArray = makeStrings(code, keys);
code.aload(argArray);
code.aload(strArray);
code.freeLocal(strArray);
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject[].class, String[].class));
freeArrayRef(argArray);
} else {
loadThreadState();
stackProduce(p(ThreadState.class));
switch (values.size()) {
case 0:
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class));
break;
case 1:
visit(values.get(0));
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class));
break;
case 2:
visit(values.get(0));
stackProduce();
visit(values.get(1));
stackConsume(3); // target + ts + arguments
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class, PyObject.class));
break;
case 3:
visit(values.get(0));
stackProduce();
visit(values.get(1));
stackProduce();
visit(values.get(2));
stackConsume(4); // target + ts + arguments
code.invokevirtual(
p(PyObject.class),
"__call__",
sig(PyObject.class, ThreadState.class, PyObject.class, PyObject.class,
PyObject.class));
break;
case 4:
visit(values.get(0));
stackProduce();
visit(values.get(1));
stackProduce();
visit(values.get(2));
stackProduce();
visit(values.get(3));
stackConsume(5); // target + ts + arguments
code.invokevirtual(
p(PyObject.class),
"__call__",
sig(PyObject.class, ThreadState.class, PyObject.class, PyObject.class,
PyObject.class, PyObject.class));
break;
default:
int argArray = makeArray(values);
code.aload(argArray);
code.freeLocal(argArray);
stackConsume(2); // target + ts
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject[].class));
break;
}
}
return null;
}
public Object Slice(Subscript node, Slice slice) throws Exception {
expr_contextType ctx = node.getInternalCtx();
if (ctx == expr_contextType.AugStore && augmode == expr_contextType.Store) {
restoreAugTmps(node, 4);
ctx = expr_contextType.Store;
} else {
visit(node.getInternalValue());
stackProduce();
if (slice.getInternalLower() != null) {
visit(slice.getInternalLower());
} else {
code.aconst_null();
}
stackProduce();
if (slice.getInternalUpper() != null) {
visit(slice.getInternalUpper());
} else {
code.aconst_null();
}
stackProduce();
if (slice.getInternalStep() != null) {
visit(slice.getInternalStep());
} else {
code.aconst_null();
}
stackProduce();
if (node.getInternalCtx() == expr_contextType.AugStore
&& augmode == expr_contextType.Load) {
saveAugTmps(node, 4);
ctx = expr_contextType.Load;
}
stackConsume(4);
}
switch (ctx) {
case Del:
code.invokevirtual(p(PyObject.class), "__delslice__",
sig(Void.TYPE, PyObject.class, PyObject.class, PyObject.class));
return null;
case Load:
code.invokevirtual(p(PyObject.class), "__getslice__",
sig(PyObject.class, PyObject.class, PyObject.class, PyObject.class));
return null;
case Param:
case Store:
code.aload(temporary);
code.invokevirtual(
p(PyObject.class),
"__setslice__",
sig(Void.TYPE, PyObject.class, PyObject.class, PyObject.class,
PyObject.class));
return null;
}
return null;
}
@Override
public Object visitSubscript(Subscript node) throws Exception {
if (node.getInternalSlice() instanceof Slice) {
return Slice(node, (Slice)node.getInternalSlice());
}
int value = temporary;
expr_contextType ctx = node.getInternalCtx();
if (node.getInternalCtx() == expr_contextType.AugStore && augmode == expr_contextType.Store) {
restoreAugTmps(node, 2);
ctx = expr_contextType.Store;
} else {
visit(node.getInternalValue());
stackProduce();
visit(node.getInternalSlice());
stackConsume();
if (node.getInternalCtx() == expr_contextType.AugStore
&& augmode == expr_contextType.Load) {
saveAugTmps(node, 2);
ctx = expr_contextType.Load;
}
}
switch (ctx) {
case Del:
code.invokevirtual(p(PyObject.class), "__delitem__", sig(Void.TYPE, PyObject.class));
return null;
case Load:
code.invokevirtual(p(PyObject.class), "__getitem__",
sig(PyObject.class, PyObject.class));
return null;
case Param:
case Store:
code.aload(value);
code.invokevirtual(p(PyObject.class), "__setitem__",
sig(Void.TYPE, PyObject.class, PyObject.class));
return null;
}
return null;
}
@Override
public Object visitIndex(Index node) throws Exception {
traverse(node);
return null;
}
@Override
public Object visitExtSlice(ExtSlice node) throws Exception {
int dims = makeArray(node.getInternalDims());
code.new_(p(PyTuple.class));
code.dup();
code.aload(dims);
code.invokespecial(p(PyTuple.class), "", sig(Void.TYPE, PyObject[].class));
freeArray(dims);
return null;
}
@Override
public Object visitAttribute(Attribute node) throws Exception {
expr_contextType ctx = node.getInternalCtx();
if (node.getInternalCtx() == expr_contextType.AugStore && augmode == expr_contextType.Store) {
restoreAugTmps(node, 2);
ctx = expr_contextType.Store;
} else {
visit(node.getInternalValue());
code.ldc(getName(node.getInternalAttr()));
if (node.getInternalCtx() == expr_contextType.AugStore
&& augmode == expr_contextType.Load) {
saveAugTmps(node, 2);
ctx = expr_contextType.Load;
}
}
switch (ctx) {
case Del:
code.invokevirtual(p(PyObject.class), "__delattr__", sig(Void.TYPE, String.class));
return null;
case Load:
code.invokevirtual(p(PyObject.class), "__getattr__",
sig(PyObject.class, String.class));
return null;
case Param:
case Store:
code.aload(temporary);
code.invokevirtual(p(PyObject.class), "__setattr__",
sig(Void.TYPE, String.class, PyObject.class));
return null;
}
return null;
}
public Object seqSet(java.util.List nodes) throws Exception {
code.aload(temporary);
code.iconst(nodes.size());
code.invokestatic(p(Py.class), "unpackSequence",
sig(PyObject[].class, PyObject.class, Integer.TYPE));
int tmp = code.getLocal("[org/python/core/PyObject");
code.astore(tmp);
for (int i = 0; i < nodes.size(); i++) {
code.aload(tmp);
code.iconst(i);
code.aaload();
set(nodes.get(i));
}
code.freeLocal(tmp);
return null;
}
public Object seqDel(java.util.List nodes) throws Exception {
for (expr e : nodes) {
visit(e);
}
return null;
}
@Override
public Object visitTuple(Tuple node) throws Exception {
if (node.getInternalCtx() == expr_contextType.Store) {
return seqSet(node.getInternalElts());
}
if (node.getInternalCtx() == expr_contextType.Del) {
return seqDel(node.getInternalElts());
}
if (my_scope.generator) {
int content = makeArray(node.getInternalElts());
code.new_(p(PyTuple.class));
code.dup();
code.aload(content);
code.invokespecial(p(PyTuple.class), "", sig(Void.TYPE, PyObject[].class));
freeArray(content);
} else {
code.new_(p(PyTuple.class));
code.dup();
loadArray(code, node.getInternalElts());
code.invokespecial(p(PyTuple.class), "", sig(Void.TYPE, PyObject[].class));
}
return null;
}
@Override
public Object visitList(List node) throws Exception {
if (node.getInternalCtx() == expr_contextType.Store) {
return seqSet(node.getInternalElts());
}
if (node.getInternalCtx() == expr_contextType.Del) {
return seqDel(node.getInternalElts());
}
if (my_scope.generator) {
int content = makeArray(node.getInternalElts());
code.new_(p(PyList.class));
code.dup();
code.aload(content);
code.invokespecial(p(PyList.class), "", sig(Void.TYPE, PyObject[].class));
freeArray(content);
} else {
code.new_(p(PyList.class));
code.dup();
loadArray(code, node.getInternalElts());
code.invokespecial(p(PyList.class), "", sig(Void.TYPE, PyObject[].class));
}
return null;
}
@Override
public Object visitListComp(ListComp node) throws Exception {
code.new_(p(PyList.class));
code.dup();
code.invokespecial(p(PyList.class), "", sig(Void.TYPE));
code.dup();
code.ldc("append");
code.invokevirtual(p(PyObject.class), "__getattr__", sig(PyObject.class, String.class));
String tmp_append = "_[" + node.getLineno() + "_" + node.getCol_offset() + "]";
java.util.List args = new ArrayList();
args.add(node.getInternalElt());
finishComp(node, args, node.getInternalGenerators(), tmp_append);
return null;
}
@Override
public Object visitSetComp(SetComp node) throws Exception {
code.new_(p(PySet.class));
code.dup();
visitInternalGenerators(node, node.getInternalElt(), node.getInternalGenerators());
code.invokespecial(p(PySet.class), "", sig(Void.TYPE, PyObject.class));
return null;
}
@Override
public Object visitDictComp(DictComp node) throws Exception {
code.new_(p(PyDictionary.class));
code.dup();
code.invokespecial(p(PyDictionary.class), "", sig(Void.TYPE));
code.dup();
java.util.List kv = Arrays.asList(node.getInternalKey(), node.getInternalValue());
visitInternalGenerators(node, new Tuple(node, kv, expr_contextType.UNDEFINED),
node.getInternalGenerators());
code.invokevirtual(p(PyDictionary.class), "update", sig(Void.TYPE, PyObject.class));
return null;
}
private void finishComp(expr node, java.util.List args,
java.util.List generators, String tmp_append) throws Exception {
set(new Name(node, tmp_append, expr_contextType.Store));
stmt n = new Expr(node, new Call(node, new Name(node, tmp_append, expr_contextType.Load), //
args, new ArrayList(), null, null));
for (int i = generators.size() - 1; i >= 0; i--) {
comprehension lc = generators.get(i);
for (int j = lc.getInternalIfs().size() - 1; j >= 0; j--) {
java.util.List body = new ArrayList();
body.add(n);
n = new If(lc.getInternalIfs().get(j), lc.getInternalIfs().get(j), body, //
new ArrayList());
}
java.util.List body = new ArrayList();
body.add(n);
n = new For(lc, lc.getInternalTarget(), lc.getInternalIter(), body, //
new ArrayList());
}
visit(n);
java.util.List targets = new ArrayList();
targets.add(new Name(n, tmp_append, expr_contextType.Del));
visit(new Delete(n, targets));
}
@Override
public Object visitDict(Dict node) throws Exception {
java.util.List elts = new ArrayList();
for (int i = 0; i < node.getInternalKeys().size(); i++) {
elts.add(node.getInternalKeys().get(i));
elts.add(node.getInternalValues().get(i));
}
if (my_scope.generator) {
int content = makeArray(elts);
code.new_(p(PyDictionary.class));
code.dup();
code.aload(content);
code.invokespecial(p(PyDictionary.class), "", sig(Void.TYPE, PyObject[].class));
freeArray(content);
} else {
code.new_(p(PyDictionary.class));
code.dup();
loadArray(code, elts);
code.invokespecial(p(PyDictionary.class), "", sig(Void.TYPE, PyObject[].class));
}
return null;
}
@Override
public Object visitSet(Set node) throws Exception {
if (my_scope.generator) {
int content = makeArray(node.getInternalElts());
code.new_(p(PySet.class));
code.dup();
code.aload(content);
code.invokespecial(p(PySet.class), "", sig(Void.TYPE, PyObject[].class));
freeArray(content);
} else {
code.new_(p(PySet.class));
code.dup();
loadArray(code, node.getInternalElts());
code.invokespecial(p(PySet.class), "", sig(Void.TYPE, PyObject[].class));
}
return null;
}
@Override
public Object visitRepr(Repr node) throws Exception {
visit(node.getInternalValue());
code.invokevirtual(p(PyObject.class), "__repr__", sig(PyString.class));
return null;
}
// a marker class to distinguish this usage; future generator rewriting may likely
// want to remove this support
private class LambdaSyntheticReturn extends Return {
private LambdaSyntheticReturn(PythonTree tree, expr value) {
super(tree, value);
}
}
@Override
public Object visitLambda(Lambda node) throws Exception {
String name = "";
// Add a synthetic return node onto the outside of suite;
java.util.List bod = new ArrayList();
bod.add(new LambdaSyntheticReturn(node, node.getInternalBody()));
mod retSuite = new Suite(node, bod);
setline(node);
ScopeInfo scope = module.getScopeInfo(node);
int defaultsArray = makeArray(scope.ac.getDefaults());
code.new_(p(PyFunction.class));
code.dup();
code.aload(defaultsArray);
code.freeLocal(defaultsArray);
loadFrame();
code.getfield(p(PyFrame.class), "f_globals", ci(PyObject.class));
code.swap();
scope.setup_closure();
scope.dump();
module.codeConstant(retSuite, name, true, className, false, false, node.getLineno(), scope,
cflags).get(code);
if (!makeClosure(scope)) {
code.invokespecial(p(PyFunction.class), "",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class));
} else {
code.invokespecial(
p(PyFunction.class),
"",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject[].class));
}
return null;
}
@Override
public Object visitEllipsis(Ellipsis node) throws Exception {
code.getstatic(p(Py.class), "Ellipsis", ci(PyObject.class));
return null;
}
@Override
public Object visitSlice(Slice node) throws Exception {
if (node.getInternalLower() == null) {
getNone();
} else {
visit(node.getInternalLower());
}
stackProduce();
if (node.getInternalUpper() == null) {
getNone();
} else {
visit(node.getInternalUpper());
}
stackProduce();
if (node.getInternalStep() == null) {
getNone();
} else {
visit(node.getInternalStep());
}
int step = storeTop();
stackConsume(2);
code.new_(p(PySlice.class));
code.dup();
code.dup2_x2();
code.pop2();
code.aload(step);
code.freeLocal(step);
code.invokespecial(p(PySlice.class), "",
sig(Void.TYPE, PyObject.class, PyObject.class, PyObject.class));
return null;
}
@Override
public Object visitClassDef(ClassDef node) throws Exception {
setline(node);
int baseArray = makeArray(node.getInternalBases());
// Get class name
String name = getName(node.getInternalName());
code.ldc(name);
code.aload(baseArray);
ScopeInfo scope = module.getScopeInfo(node);
scope.setup_closure();
scope.dump();
// Make code object out of suite
module.codeConstant(new Suite(node, node.getInternalBody()), name, false, name,
getDocStr(node.getInternalBody()), true, false, node.getLineno(), scope, cflags)
.get(code);
// Make class out of name, bases, and code
if (!makeClosure(scope)) {
code.invokestatic(p(Py.class), "makeClass",
sig(PyObject.class, String.class, PyObject[].class, PyCode.class));
} else {
code.invokestatic(
p(Py.class),
"makeClass",
sig(PyObject.class, String.class, PyObject[].class, PyCode.class,
PyObject[].class));
}
applyDecorators(node.getInternalDecorator_list());
// Assign this new class to the given name
set(new Name(node, node.getInternalName(), expr_contextType.Store));
freeArray(baseArray);
return null;
}
@Override
public Object visitNum(Num node) throws Exception {
if (node.getInternalN() instanceof PyInteger) {
module.integerConstant(((PyInteger)node.getInternalN()).getValue()).get(code);
} else if (node.getInternalN() instanceof PyLong) {
module.longConstant(((PyObject)node.getInternalN()).__str__().toString()).get(code);
} else if (node.getInternalN() instanceof PyFloat) {
module.floatConstant(((PyFloat)node.getInternalN()).getValue()).get(code);
} else if (node.getInternalN() instanceof PyComplex) {
module.complexConstant(((PyComplex)node.getInternalN()).imag).get(code);
}
return null;
}
private String getName(String name) {
if (className != null && name.startsWith("__") && !name.endsWith("__")) {
// remove leading '_' from classname
int i = 0;
while (className.charAt(i) == '_') {
i++;
}
return "_" + className.substring(i) + name;
}
return name;
}
void emitGetGlobal(String name) throws Exception {
code.ldc(name);
code.invokevirtual(p(PyFrame.class), "getglobal", sig(PyObject.class, String.class));
}
@Override
public Object visitName(Name node) throws Exception {
String name;
if (fast_locals) {
name = node.getInternalId();
} else {
name = getName(node.getInternalId());
}
SymInfo syminf = tbl.get(name);
expr_contextType ctx = node.getInternalCtx();
if (ctx == expr_contextType.AugStore) {
ctx = augmode;
}
switch (ctx) {
case Load:
loadFrame();
if (syminf != null) {
int flags = syminf.flags;
if ((flags & ScopeInfo.GLOBAL) != 0 || optimizeGlobals
&& (flags & (ScopeInfo.BOUND | ScopeInfo.CELL | ScopeInfo.FREE)) == 0) {
emitGetGlobal(name);
return null;
}
if (fast_locals) {
if ((flags & ScopeInfo.CELL) != 0) {
code.iconst(syminf.env_index);
code.invokevirtual(p(PyFrame.class), "getderef",
sig(PyObject.class, Integer.TYPE));
return null;
}
if ((flags & ScopeInfo.BOUND) != 0) {
code.iconst(syminf.locals_index);
code.invokevirtual(p(PyFrame.class), "getlocal",
sig(PyObject.class, Integer.TYPE));
return null;
}
}
if ((flags & ScopeInfo.FREE) != 0 && (flags & ScopeInfo.BOUND) == 0) {
code.iconst(syminf.env_index);
code.invokevirtual(p(PyFrame.class), "getderef",
sig(PyObject.class, Integer.TYPE));
return null;
}
}
code.ldc(name);
code.invokevirtual(p(PyFrame.class), "getname", sig(PyObject.class, String.class));
return null;
case Param:
case Store:
loadFrame();
if (syminf != null && (syminf.flags & ScopeInfo.GLOBAL) != 0) {
code.ldc(name);
code.aload(temporary);
code.invokevirtual(p(PyFrame.class), "setglobal",
sig(Void.TYPE, String.class, PyObject.class));
} else {
if (!fast_locals) {
code.ldc(name);
code.aload(temporary);
code.invokevirtual(p(PyFrame.class), "setlocal",
sig(Void.TYPE, String.class, PyObject.class));
} else {
if (syminf == null) {
throw new ParseException("internal compiler error", node);
}
if ((syminf.flags & ScopeInfo.CELL) != 0) {
code.iconst(syminf.env_index);
code.aload(temporary);
code.invokevirtual(p(PyFrame.class), "setderef",
sig(Void.TYPE, Integer.TYPE, PyObject.class));
} else {
code.iconst(syminf.locals_index);
code.aload(temporary);
code.invokevirtual(p(PyFrame.class), "setlocal",
sig(Void.TYPE, Integer.TYPE, PyObject.class));
}
}
}
return null;
case Del: {
loadFrame();
if (syminf != null && (syminf.flags & ScopeInfo.GLOBAL) != 0) {
code.ldc(name);
code.invokevirtual(p(PyFrame.class), "delglobal", sig(Void.TYPE, String.class));
} else {
if (!fast_locals) {
code.ldc(name);
code.invokevirtual(p(PyFrame.class), "dellocal",
sig(Void.TYPE, String.class));
} else {
if (syminf == null) {
throw new ParseException("internal compiler error", node);
}
if ((syminf.flags & ScopeInfo.CELL) != 0) {
module.error("can not delete variable '" + name
+ "' referenced in nested scope", true, node);
}
code.iconst(syminf.locals_index);
code.invokevirtual(p(PyFrame.class), "dellocal",
sig(Void.TYPE, Integer.TYPE));
}
}
return null;
}
}
return null;
}
@Override
public Object visitStr(Str node) throws Exception {
PyString s = (PyString)node.getInternalS();
if (s instanceof PyUnicode) {
module.unicodeConstant(s.asString()).get(code);
} else {
module.stringConstant(s.asString()).get(code);
}
return null;
}
private Object visitInternalGenerators(expr node, expr elt,
java.util.List generators) throws Exception {
String bound_exp = "_(x)";
setline(node);
code.new_(p(PyFunction.class));
code.dup();
loadFrame();
code.getfield(p(PyFrame.class), "f_globals", ci(PyObject.class));
ScopeInfo scope = module.getScopeInfo(node);
int emptyArray = makeArray(new ArrayList());
code.aload(emptyArray);
scope.setup_closure();
scope.dump();
stmt n = new Expr(node, new Yield(node, elt));
expr iter = null;
for (int i = generators.size() - 1; i >= 0; i--) {
comprehension comp = generators.get(i);
for (int j = comp.getInternalIfs().size() - 1; j >= 0; j--) {
java.util.List bod = new ArrayList();
bod.add(n);
n = new If(comp.getInternalIfs().get(j), comp.getInternalIfs().get(j), bod, //
new ArrayList());
}
java.util.List bod = new ArrayList();
bod.add(n);
if (i != 0) {
n = new For(comp, comp.getInternalTarget(), comp.getInternalIter(), bod, //
new ArrayList());
} else {
n = new For(comp, comp.getInternalTarget(), new Name(node, bound_exp, //
expr_contextType.Load), bod, new ArrayList());
iter = comp.getInternalIter();
}
}
java.util.List bod = new ArrayList();
bod.add(n);
module.codeConstant(new Suite(node, bod), "", true, className, false, false,
node.getLineno(), scope, cflags).get(code);
code.aconst_null();
if (!makeClosure(scope)) {
code.invokespecial(p(PyFunction.class), "",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject.class));
} else {
code.invokespecial(
p(PyFunction.class),
"",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject.class,
PyObject[].class));
}
int genExp = storeTop();
visit(iter);
code.aload(genExp);
code.freeLocal(genExp);
code.swap();
code.invokevirtual(p(PyObject.class), "__iter__", sig(PyObject.class));
loadThreadState();
code.swap();
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class));
freeArray(emptyArray);
return null;
}
@Override
public Object visitGeneratorExp(GeneratorExp node) throws Exception {
String bound_exp = "_(x)";
setline(node);
code.new_(p(PyFunction.class));
code.dup();
loadFrame();
code.getfield(p(PyFrame.class), "f_globals", ci(PyObject.class));
ScopeInfo scope = module.getScopeInfo(node);
int emptyArray = makeArray(new ArrayList());
code.aload(emptyArray);
scope.setup_closure();
scope.dump();
stmt n = new Expr(node, new Yield(node, node.getInternalElt()));
expr iter = null;
for (int i = node.getInternalGenerators().size() - 1; i >= 0; i--) {
comprehension comp = node.getInternalGenerators().get(i);
for (int j = comp.getInternalIfs().size() - 1; j >= 0; j--) {
java.util.List bod = new ArrayList();
bod.add(n);
n = new If(comp.getInternalIfs().get(j), comp.getInternalIfs().get(j), bod, //
new ArrayList());
}
java.util.List bod = new ArrayList();
bod.add(n);
if (i != 0) {
n = new For(comp, comp.getInternalTarget(), comp.getInternalIter(), bod, //
new ArrayList());
} else {
n = new For(comp, comp.getInternalTarget(), new Name(node, bound_exp, //
expr_contextType.Load), bod, new ArrayList());
iter = comp.getInternalIter();
}
}
java.util.List bod = new ArrayList();
bod.add(n);
module.codeConstant(new Suite(node, bod), "", true, className, false, false,
node.getLineno(), scope, cflags).get(code);
code.aconst_null();
if (!makeClosure(scope)) {
code.invokespecial(p(PyFunction.class), "",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject.class));
} else {
code.invokespecial(
p(PyFunction.class),
"",
sig(Void.TYPE, PyObject.class, PyObject[].class, PyCode.class, PyObject.class,
PyObject[].class));
}
int genExp = storeTop();
visit(iter);
code.aload(genExp);
code.freeLocal(genExp);
code.swap();
code.invokevirtual(p(PyObject.class), "__iter__", sig(PyObject.class));
loadThreadState();
code.swap();
code.invokevirtual(p(PyObject.class), "__call__",
sig(PyObject.class, ThreadState.class, PyObject.class));
freeArray(emptyArray);
return null;
}
@Override
public Object visitWith(With node) throws Exception {
if (!module.getFutures().withStatementSupported()) {
throw new ParseException("'with' will become a reserved keyword in Python 2.6", node);
}
final Label label_body_start = new Label();
final Label label_body_end = new Label();
final Label label_catch = new Label();
final Label label_end = new Label();
final Method contextGuard_getManager =
Method.getMethod("org.python.core.ContextManager getManager (org.python.core.PyObject)");
final Method __enter__ =
Method.getMethod("org.python.core.PyObject __enter__ (org.python.core.ThreadState)");
final Method __exit__ =
Method.getMethod("boolean __exit__ (org.python.core.ThreadState,org.python.core.PyException)");
// mgr = (EXPR)
visit(node.getInternalContext_expr());
// wrap the manager with the ContextGuard (or get it directly if it
// supports the ContextManager interface)
code.invokestatic(Type.getType(ContextGuard.class).getInternalName(),
contextGuard_getManager.getName(), contextGuard_getManager.getDescriptor());
code.dup();
final int mgr_tmp = code.getLocal(Type.getType(ContextManager.class).getInternalName());
code.astore(mgr_tmp);
// value = mgr.__enter__()
loadThreadState();
code.invokeinterface(Type.getType(ContextManager.class).getInternalName(),
__enter__.getName(), __enter__.getDescriptor(), true);
int value_tmp = code.getLocal(p(PyObject.class));
code.astore(value_tmp);
// exc = True # not necessary, since we don't exec finally if exception
// FINALLY (preparation)
// ordinarily with a finally, we need to duplicate the code. that's not the case
// here
// # The normal and non-local-goto cases are handled here
// if exc: # implicit
// exit(None, None, None)
ExceptionHandler normalExit = new ExceptionHandler() {
@Override
public boolean isFinallyHandler() {
return true;
}
@Override
public void finalBody(CodeCompiler compiler) throws Exception {
compiler.code.aload(mgr_tmp);
loadThreadState();
compiler.code.aconst_null();
compiler.code.invokeinterface(Type.getType(ContextManager.class).getInternalName(),
__exit__.getName(), __exit__.getDescriptor(), true);
compiler.code.pop();
}
};
exceptionHandlers.push(normalExit);
// try-catch block here
ExceptionHandler handler = new ExceptionHandler();
exceptionHandlers.push(handler);
handler.exceptionStarts.addElement(label_body_start);
// VAR = value # Only if "as VAR" is present
code.label(label_body_start);
if (node.getInternalOptional_vars() != null) {
set(node.getInternalOptional_vars(), value_tmp);
}
code.freeLocal(value_tmp);
// BLOCK + FINALLY if non-local-goto
Object blockResult = suite(node.getInternalBody());
normalExit.bodyDone = true;
exceptionHandlers.pop();
exceptionHandlers.pop();
code.label(label_body_end);
handler.exceptionEnds.addElement(label_body_end);
// FINALLY if *not* non-local-goto
if (blockResult == NoExit) {
// BLOCK would have generated FINALLY for us if it exited (due to a break,
// continue or return)
inlineFinally(normalExit);
code.goto_(label_end);
}
// CATCH
code.label(label_catch);
loadFrame();
code.invokestatic(p(Py.class), "setException",
sig(PyException.class, Throwable.class, PyFrame.class));
code.aload(mgr_tmp);
code.swap();
loadThreadState();
code.swap();
code.invokeinterface(Type.getType(ContextManager.class).getInternalName(),
__exit__.getName(), __exit__.getDescriptor(), true);
// # The exceptional case is handled here
// exc = False # implicit
// if not exit(*sys.exc_info()):
code.ifne(label_end);
// raise
// # The exception is swallowed if exit() returns true
code.invokestatic(p(Py.class), "makeException", sig(PyException.class));
code.checkcast(p(Throwable.class));
code.athrow();
code.label(label_end);
code.freeLocal(mgr_tmp);
handler.addExceptionHandlers(label_catch);
return null;
}
@Override
protected Object unhandled_node(PythonTree node) throws Exception {
throw new Exception("Unhandled node " + node);
}
/**
* Data about a given exception range whether a try:finally: or a try:except:. The finally needs
* to inline the finally block for each exit of the try: section, so we carry around that data
* for it.
*
* Both of these need to stop exception coverage of an area that is either the inlined fin ally
* of a parent try:finally: or the reentry block after a yield. Thus we keep around a set of
* exception ranges that the catch block will eventually handle.
*/
class ExceptionHandler {
/**
* Each handler gets several exception ranges, this is because inlined finally exit code
* shouldn't be covered by the exception handler of that finally block. Thus each time we
* inline the finally code, we stop one range and then enter a new one.
*
* We also need to stop coverage for the recovery of the locals after a yield.
*/
public Vector exceptionStarts = new Vector();
public Vector exceptionEnds = new Vector();
public boolean bodyDone = false;
public PythonTree node = null;
public ExceptionHandler() {}
public ExceptionHandler(PythonTree n) {
node = n;
}
public boolean isFinallyHandler() {
return node != null;
}
public void addExceptionHandlers(Label handlerStart) throws Exception {
for (int i = 0; i < exceptionStarts.size(); ++i) {
Label start = exceptionStarts.elementAt(i);
Label end = exceptionEnds.elementAt(i);
// FIXME: not at all sure that getOffset() test is correct or necessary.
if (start.getOffset() != end.getOffset()) {
code.trycatch(exceptionStarts.elementAt(i), exceptionEnds.elementAt(i),
handlerStart, p(Throwable.class));
}
}
}
public void finalBody(CodeCompiler compiler) throws Exception {
if (node instanceof TryFinally) {
suite(((TryFinally)node).getInternalFinalbody());
}
}
}
}
