Handle evaluation of statements, not just expressions.
Also handle statements in conditional breakpoints.
This is more consistent with other common debuggers (e.g. java, python).
Calls Parser#parseStatement with local parsing level, so some statement types aren't handled (e.g. load statements), which is broadly consistent with other debuggers.
Assignment, augmented assignment, and return statements return a non-None value,
and simple expression statements still return the result of evaluating the expression.
TAG_CHANGE_OK=This proto has never yet been used
TYPE_CHANGE_OK=This proto has never yet been used
PiperOrigin-RevId: 202135678
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/Environment.java b/src/main/java/com/google/devtools/build/lib/syntax/Environment.java
index 5b22906..d5b0d6c 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/Environment.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/Environment.java
@@ -29,6 +29,7 @@
import com.google.devtools.build.lib.skylarkinterface.SkylarkValue;
import com.google.devtools.build.lib.syntax.Mutability.Freezable;
import com.google.devtools.build.lib.syntax.Mutability.MutabilityException;
+import com.google.devtools.build.lib.syntax.Parser.ParsingLevel;
import com.google.devtools.build.lib.util.Fingerprint;
import com.google.devtools.build.lib.util.Pair;
import com.google.devtools.build.lib.util.SpellChecker;
@@ -1169,15 +1170,31 @@
}
@Override
- public Object evaluate(String expression) throws EvalException, InterruptedException {
- ParserInputSource inputSource =
- ParserInputSource.create(expression, PathFragment.create("<debug eval>"));
+ public Object evaluate(String contents) throws EvalException, InterruptedException {
+ ParserInputSource input =
+ ParserInputSource.create(contents, PathFragment.create("<debug eval>"));
EvalEventHandler eventHandler = new EvalEventHandler();
- Expression expr = Parser.parseExpression(inputSource, eventHandler);
+ Statement statement = Parser.parseStatement(input, eventHandler, ParsingLevel.LOCAL_LEVEL);
if (!eventHandler.messages.isEmpty()) {
- throw new EvalException(expr.getLocation(), eventHandler.messages.get(0));
+ throw new EvalException(statement.getLocation(), eventHandler.messages.get(0));
}
- return expr.eval(this);
+ // TODO(bazel-team): move statement handling code to Eval
+ // deal with the most common case first
+ if (statement.kind() == Statement.Kind.EXPRESSION) {
+ return ((ExpressionStatement) statement).getExpression().doEval(this);
+ }
+ // all other statement types are executed directly
+ Eval.fromEnvironment(this).exec(statement);
+ switch (statement.kind()) {
+ case ASSIGNMENT:
+ case AUGMENTED_ASSIGNMENT:
+ return ((AssignmentStatement) statement).getLValue().getExpression().doEval(this);
+ case RETURN:
+ Expression expr = ((ReturnStatement) statement).getReturnExpression();
+ return expr != null ? expr.doEval(this) : Runtime.NONE;
+ default:
+ return Runtime.NONE;
+ }
}
@Override
