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Add 'ctx' keyword to painless.

This commit is contained in:
Robert Muir 2016-05-11 02:29:35 -04:00
parent 30b5b4fc83
commit 7689a1af28
9 changed files with 66 additions and 25 deletions
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4
modules/lang-painless/src/main/java/org/elasticsearch/painless/Analyzer.java
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@ -101,7 +101,7 @@ class Analyzer extends PainlessParserBaseVisitor<Void> {
// scorer parameter passed to the script. internal use only.
metadata.scorerValueSlot = utility.addVariable(null, "#scorer", definition.objectType).slot;
// doc parameter passed to the script.
// TODO: currently working as a def type, should be smapType...
// TODO: currently working as a Map<String,Def>, we can do better?
metadata.docValueSlot = utility.addVariable(null, "doc", definition.smapType).slot;
//
// reserved words implemented as local variables
@ -110,6 +110,8 @@ class Analyzer extends PainlessParserBaseVisitor<Void> {
metadata.loopCounterSlot = utility.addVariable(null, "#loop", definition.intType).slot;
// document's score as a read-only float.
metadata.scoreValueSlot = utility.addVariable(null, "_score", definition.floatType).slot;
// ctx map set by executable scripts as a read-only map.
metadata.ctxValueSlot = utility.addVariable(null, "ctx", definition.smapType).slot;
metadata.createStatementMetadata(metadata.root);
visit(metadata.root);

14
modules/lang-painless/src/main/java/org/elasticsearch/painless/AnalyzerExternal.java
View File

@ -449,16 +449,18 @@ class AnalyzerExternal {
}
// special cases: reserved words
if (varenmd.last && ("_score".equals(id) || "doc".equals(id))) {
// read-only: don't allow stores
if (parentemd.storeExpr != null) {
if ("_score".equals(id) || "doc".equals(id) || "ctx".equals(id)) {
// read-only: don't allow stores to ourself
if (varenmd.last && parentemd.storeExpr != null) {
throw new IllegalArgumentException(AnalyzerUtility.error(ctx) + "Variable [" + id + "] is read-only.");
}
}
// track if the _score value is ever used, we will invoke Scorer.score() only once if so.
if ("_score".equals(id)) {
// track if the _score value is ever used, we will invoke Scorer.score() only once if so.
metadata.scoreValueUsed = true;
} else if ("ctx".equals(id)) {
// track if ctx value is ever used, we will invoke Map.get() only once if so.
metadata.ctxValueUsed = true;
}
}
varenmd.target = variable.slot;

16
modules/lang-painless/src/main/java/org/elasticsearch/painless/Metadata.java
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@ -429,8 +429,8 @@ class Metadata {
int scoreValueSlot = -1;
/**
* Used to determine if the _score variable is actually used. This is used in the {@link Analyzer} to update
* variable slots at the completion of analysis if _score is not used.
* Used to determine if the _score variable is actually used. This is used to know if we should call
* Scorer.score() once and cache into a local variable, and expose NeedsScore interface (to allow query caching)
*/
boolean scoreValueUsed = false;
@ -440,6 +440,18 @@ class Metadata {
*/
int docValueSlot = -1;
/**
* Used to determine what slot the ctx variable is stored in. This is used in the {@link Writer} whenever
* the ctx variable is accessed.
*/
int ctxValueSlot = -1;
/**
* Used to determine if the ctx variable is actually used. This is used to determine if we should call
* Map.get once and store into a local variable on startup.
*/
boolean ctxValueUsed = false;
/**
* Maps the relevant ANTLR node to its metadata.
*/

9
modules/lang-painless/src/main/java/org/elasticsearch/painless/Writer.java
View File

@ -158,6 +158,15 @@ class Writer extends PainlessParserBaseVisitor<Void> {
execute.visitVarInsn(Opcodes.FSTORE, metadata.scoreValueSlot);
}
if (metadata.ctxValueUsed) {
// if the _ctx value is used, we do this once:
// Map<String,Object> ctx = input.get("ctx");
execute.visitVarInsn(Opcodes.ALOAD, metadata.inputValueSlot);
execute.push("ctx");
execute.invokeInterface(WriterConstants.MAP_TYPE, WriterConstants.MAP_GET);
execute.visitVarInsn(Opcodes.ASTORE, metadata.ctxValueSlot);
}
execute.push(settings.getMaxLoopCounter());
execute.visitVarInsn(Opcodes.ISTORE, metadata.loopCounterSlot);

4
modules/lang-painless/src/main/java/org/elasticsearch/painless/WriterExternal.java
View File

@ -422,10 +422,6 @@ class WriterExternal {
throw new IllegalStateException(WriterUtility.error(source) + "Cannot load/store void type.");
}
if (!metadata.scoreValueUsed && slot > metadata.scoreValueSlot) {
--slot;
}
if (store) {
execute.visitVarInsn(type.type.getOpcode(Opcodes.ISTORE), slot);
} else {

4
modules/lang-painless/src/main/java/org/elasticsearch/painless/WriterStatement.java
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@ -328,10 +328,6 @@ class WriterStatement {
final Sort sort = declvaremd.to.sort;
int slot = (int)declvaremd.postConst;
if (!metadata.scoreValueUsed && slot > metadata.scoreValueSlot) {
--slot;
}
final ExpressionContext exprctx = ctx.expression();
final boolean initialize = exprctx == null;

26
modules/lang-painless/src/test/java/org/elasticsearch/painless/ReservedWordTests.java
View File

@ -19,6 +19,9 @@
package org.elasticsearch.painless;
import java.util.Collections;
import java.util.HashMap;
/** Tests for special reserved words such as _score */
public class ReservedWordTests extends ScriptTestCase {
@ -46,11 +49,32 @@ public class ReservedWordTests extends ScriptTestCase {
assertTrue(expected.getMessage().contains("Variable name [doc] already defined"));
}
/** check that we can't write to _score, its read-only! */
/** check that we can't write to doc, its read-only! */
public void testDocStore() {
IllegalArgumentException expected = expectThrows(IllegalArgumentException.class, () -> {
exec("doc = 5; return doc;");
});
assertTrue(expected.getMessage().contains("Variable [doc] is read-only"));
}
/** check that we can't declare a variable of ctx, its really reserved! */
public void testCtxVar() {
IllegalArgumentException expected = expectThrows(IllegalArgumentException.class, () -> {
exec("int ctx = 5; return ctx;");
});
assertTrue(expected.getMessage().contains("Variable name [ctx] already defined"));
}
/** check that we can't write to ctx, its read-only! */
public void testCtxStore() {
IllegalArgumentException expected = expectThrows(IllegalArgumentException.class, () -> {
exec("ctx = 5; return ctx;");
});
assertTrue(expected.getMessage().contains("Variable [ctx] is read-only"));
}
/** check that we can modify its contents though */
public void testCtxStoreMap() {
assertEquals(5, exec("ctx.foo = 5; return ctx.foo;", Collections.singletonMap("ctx", new HashMap<String,Object>())));
}
}

4
modules/lang-painless/src/test/resources/rest-api-spec/test/plan_a/15_update.yaml
View File

@ -18,7 +18,7 @@
script: "1"
body:
lang: painless
script: "input.ctx._source.foo = input.bar"
script: "ctx._source.foo = input.bar"
params: { bar: 'xxx' }
- match: { _index: test_1 }
@ -41,7 +41,7 @@
type: test
id: 1
lang: painless
script: "input.ctx._source.foo = 'yyy'"
script: "ctx._source.foo = 'yyy'"
- match: { _index: test_1 }
- match: { _type: test }

6
modules/lang-painless/src/test/resources/rest-api-spec/test/plan_a/25_script_upsert.yaml
View File

@ -7,7 +7,7 @@
type: test
id: 1
body:
script: "input.ctx._source.foo = input.bar"
script: "ctx._source.foo = input.bar"
lang: "painless"
params: { bar: 'xxx' }
upsert: { foo: baz }
@ -27,7 +27,7 @@
type: test
id: 1
body:
script: "input.ctx._source.foo = input.bar"
script: "ctx._source.foo = input.bar"
lang: "painless"
params: { bar: 'xxx' }
upsert: { foo: baz }
@ -46,7 +46,7 @@
type: test
id: 2
body:
script: "input.ctx._source.foo = input.bar"
script: "ctx._source.foo = input.bar"
lang: "painless"
params: { bar: 'xxx' }
upsert: { foo: baz }