[vm,dyn_modules] Source position cleanups and fewer temp uses.
Reduces the usage of temps in the following cases to remove unneeded StoreLocal/Push instructions: Refactors visitVariableSet so that a temporary is used only if the variable is captured and the result is not ignored. (That is, sets of uncaptured late final fields no longer need a temporary.) Only allocate a temp for FunctionDeclarations and FunctionExpressions if there are function type arguments to capture or if the function is generic (in which case the delayed type arguments field must be empty-initialized, not null initialized). ----- Clean up how source positions are emitted to both be more consistent and to also move some source position emissions closer to the actual instruction that performs the operation: Move emission of debugging information for FunctionDeclaration, and VariableSet to when the variable is actually set. The emission in VariableDeclaration stays before the initializer as that's when debugger tests expect to pause at it. Change the implementation of _genConditionAndJumpIf to use if/else chaining instead of early returns so that the condition's source position can be recorded once before the if/then chain and then the previous source position restored afterward the chain. This means that _emitDebuggerInformation can be used. _generateNonLocalControlTransfer is only called during visit methods where the parent call to _generateNode has already recorded the from node's position, so there's no need to record it during that call. Instead, move the emission of the source position to the jump within the passed continuation. Remove _emitLocalSourcePosition, since it is no longer used. Cq-Include-Trybots: luci.dart.try:vm-dyn-linux-debug-x64-try,vm-dyn-mac-debug-arm64-try Change-Id: Id7722146769c57713ae466d67401258c010cee37 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/473380 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Tess Strickland <sstrickl@google.com>
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a02596b28f
@@ -1533,25 +1533,23 @@ class BytecodeGenerator extends RecursiveVisitor {
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}
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void _genConditionAndJumpIf(Expression condition, bool value, Label dest) {
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final savedSourcePosition = asm.currentSourcePosition;
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_recordSourcePosition(condition.fileOffset);
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final bool? constantValue = _constantConditionValue(condition);
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if (constantValue != null) {
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if (constantValue == value) {
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_emitLocalSourcePosition(condition.fileOffset);
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_emitSourcePosition();
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asm.emitJump(dest);
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}
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return;
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}
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if (condition is EqualsNull) {
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} else if (condition is EqualsNull) {
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_generateNode(condition.expression);
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_emitLocalSourcePosition(condition.fileOffset);
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_emitSourcePosition();
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if (value) {
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asm.emitJumpIfNull(dest);
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} else {
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asm.emitJumpIfNotNull(dest);
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}
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return;
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}
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if (condition is Not) {
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} else if (condition is Not) {
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_genConditionAndJumpIf(condition.operand, !value, dest);
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} else if (condition is LogicalExpression) {
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final isOR = (condition.operatorEnum == LogicalExpressionOperator.OR);
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@@ -1573,13 +1571,14 @@ class BytecodeGenerator extends RecursiveVisitor {
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if (negated) {
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value = !value;
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}
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_emitLocalSourcePosition(condition.fileOffset);
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_emitSourcePosition();
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if (value) {
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asm.emitJumpIfTrue(dest);
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} else {
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asm.emitJumpIfFalse(dest);
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}
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}
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asm.currentSourcePosition = savedSourcePosition;
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}
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int _getDefaultParamConstIndex(VariableDeclaration param) {
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@@ -2637,20 +2636,25 @@ class BytecodeGenerator extends RecursiveVisitor {
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_genPushInstantiatorTypeArguments();
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asm.emitAllocateClosure();
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final int temp = locals.tempIndexInFrame(node);
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asm.emitStoreLocal(temp);
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final bool storeFunctionTAV = locals.hasFunctionTypeArgsVar;
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final bool setEmptyDelayedTAV = function.typeParameters.isNotEmpty;
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if (locals.hasFunctionTypeArgsVar) {
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asm.emitPush(temp);
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_genPushFunctionTypeArguments();
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asm.emitStoreFieldTOS(cp.addInstanceField(closureFunctionTypeArguments));
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}
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if (storeFunctionTAV || setEmptyDelayedTAV) {
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final int temp = locals.tempIndexInFrame(node);
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asm.emitStoreLocal(temp);
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// Delayed type arguments are only used by generic closures.
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if (function.typeParameters.isNotEmpty) {
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asm.emitPush(temp);
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asm.emitPushConstant(cp.addEmptyTypeArguments());
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asm.emitStoreFieldTOS(cp.addInstanceField(closureDelayedTypeArguments));
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if (storeFunctionTAV) {
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asm.emitPush(temp);
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_genPushFunctionTypeArguments();
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asm.emitStoreFieldTOS(
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cp.addInstanceField(closureFunctionTypeArguments));
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}
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if (setEmptyDelayedTAV) {
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asm.emitPush(temp);
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asm.emitPushConstant(cp.addEmptyTypeArguments());
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asm.emitStoreFieldTOS(cp.addInstanceField(closureDelayedTypeArguments));
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}
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}
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}
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@@ -2770,27 +2774,13 @@ class BytecodeGenerator extends RecursiveVisitor {
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// Emits a source position entry and/or debugger stop as appropriate.
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void _emitSourcePosition() {
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if (options.emitSourcePositions) {
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asm.emitSourcePosition();
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}
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asm.emitSourcePosition();
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if (options.emitDebuggerStops &&
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(asm.currentSourcePositionFlags & SourcePositions.syntheticFlag) == 0) {
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asm.emitDebugCheck();
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}
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}
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// Records the given file offset as the current source position and
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// emits a source position entry and/or debugger stop as appropriate,
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// restoring the current source position afterwards.
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void _emitLocalSourcePosition(int fileOffset) {
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if (fileOffset != TreeNode.noOffset) {
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final savedSourcePosition = asm.currentSourcePosition;
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_recordSourcePosition(fileOffset);
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_emitSourcePosition();
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asm.currentSourcePosition = savedSourcePosition;
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}
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}
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/// Generates non-local transfer from inner node [from] into the outer
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/// node, executing finally blocks on the way out. [to] can be null,
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/// in such case all enclosing finally blocks are executed.
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@@ -2798,7 +2788,6 @@ class BytecodeGenerator extends RecursiveVisitor {
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/// the last finally block.
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void _generateNonLocalControlTransfer(
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TreeNode from, TreeNode to, GenerateContinuation continuation) {
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_emitLocalSourcePosition(from.fileOffset);
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List<TryFinally> tryFinallyBlocks = _getEnclosingTryFinallyBlocks(from, to);
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_addFinallyBlocks(tryFinallyBlocks, continuation);
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}
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@@ -3737,31 +3726,44 @@ class BytecodeGenerator extends RecursiveVisitor {
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@override
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void visitVariableSet(VariableSet node) {
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final v = node.variable;
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final bool hasResult = !isExpressionWithoutResult(node);
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final bool isLateFinal = v.isLate && v.isFinal;
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if (!isLateFinal) {
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_genPushContextIfCaptured(v);
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}
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_genPushContextIfCaptured(v);
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_generateNode(node.value);
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// Wrap the set in an already initialized check for late final variables.
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final bool isLateFinal = v.isLate && v.isFinal;
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final Label error = new Label();
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if (isLateFinal) {
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_genLoadVar(v);
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asm.emitJumpIfInitialized(error);
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}
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// _genStoreVar pops the stored value off the stack. If the result isn't
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// used, this is fine. If it is used but the variable isn't captured, then
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// the generator uses StoreLocal instead of calling _genStoreVar. Otherwise,
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// a temporary must be used to save and restore the value (as there is no
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// keep-on-stack equivalent of StoreContextVar).
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final bool hasResult = !isExpressionWithoutResult(node);
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final bool isCaptured = locals.isCaptured(v);
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final bool storeResultInTemp = hasResult && isCaptured;
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if (storeResultInTemp) {
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asm.emitStoreLocal(locals.tempIndexInFrame(node));
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}
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if (!v.isSynthesized) {
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_emitSourcePosition();
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}
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if (hasResult && !isCaptured) {
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asm.emitStoreLocal(locals.getVarIndexInFrame(v));
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} else {
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_genStoreVar(v);
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}
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if (storeResultInTemp) {
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asm.emitPush(locals.tempIndexInFrame(node));
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}
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if (isLateFinal) {
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final int temp = locals.tempIndexInFrame(node);
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asm.emitPopLocal(temp);
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final Label error = new Label();
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final Label done = new Label();
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_genLoadVar(v);
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asm.emitJumpIfInitialized(error);
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_genPushContextIfCaptured(v);
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asm.emitPush(temp);
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_genStoreVar(v);
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asm.emitJump(done);
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asm.bind(error);
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@@ -3771,28 +3773,6 @@ class BytecodeGenerator extends RecursiveVisitor {
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asm.emitDrop1();
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asm.bind(done);
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if (hasResult) {
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asm.emitPush(temp);
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}
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} else if (locals.isCaptured(v)) {
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final int temp = locals.tempIndexInFrame(node);
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if (hasResult) {
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asm.emitStoreLocal(temp);
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}
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_genStoreVar(v);
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if (hasResult) {
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asm.emitPush(temp);
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}
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} else {
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final int localIndex = locals.getVarIndexInFrame(v);
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if (hasResult) {
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asm.emitStoreLocal(localIndex);
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} else {
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asm.emitPopLocal(localIndex);
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}
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}
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}
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@@ -3887,6 +3867,7 @@ class BytecodeGenerator extends RecursiveVisitor {
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_generateNonLocalControlTransfer(node, node.target, () {
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_genUnwindContext(targetContextLevel);
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_emitSourcePosition();
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asm.emitJump(targetLabel);
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});
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}
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@@ -3899,6 +3880,7 @@ class BytecodeGenerator extends RecursiveVisitor {
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_generateNonLocalControlTransfer(node, node.target.parent!, () {
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_genUnwindContext(targetContextLevel);
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_emitSourcePosition();
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asm.emitJump(targetLabel);
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});
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}
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@@ -3991,9 +3973,9 @@ class BytecodeGenerator extends RecursiveVisitor {
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@override
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void visitFunctionDeclaration(ast.FunctionDeclaration node) {
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_emitSourcePosition();
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_genPushContextIfCaptured(node.variable);
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_genClosure(node, node.variable.name!, node.function);
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_emitSourcePosition();
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_genStoreVar(node.variable);
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}
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@@ -4394,8 +4376,9 @@ class BytecodeGenerator extends RecursiveVisitor {
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asm.currentSourcePositionFlags |= SourcePositions.syntheticFlag;
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}
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if (emitStore) {
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// Record the source position at the start of the bytecode generated
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// for storing the variable.
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// Record the source position of the declaration at the start of
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// the generated bytecode since debugger tests expect to pause
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// at the declaration prior to running the initializer (if any).
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if (initializer != null) {
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_recordSourcePosition(node.fileEqualsOffset);
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}
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@@ -1003,19 +1003,37 @@ class _Allocator extends RecursiveVisitor {
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_visitFunction(node);
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}
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// A temporary is only needed for function declarations or expressions when:
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// * There are function type arguments to capture.
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// * The function is generic and so the delayed type arguments field of the
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// closure must be empty-initialized, not null-initialized.
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bool _closureAllocationNeedsTemp(FunctionNode function) =>
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_currentFrame.functionTypeArgsVar != null ||
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function.typeParameters.isNotEmpty;
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@override
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void visitFunctionDeclaration(FunctionDeclaration node) {
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_allocateVariable(node.variable);
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_allocateTemp(node);
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final needsTemp = _closureAllocationNeedsTemp(node.function);
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if (needsTemp) {
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_allocateTemp(node);
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}
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_visitFunction(node);
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_freeTemp(node);
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if (needsTemp) {
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_freeTemp(node);
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}
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}
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@override
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void visitFunctionExpression(FunctionExpression node) {
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_allocateTemp(node);
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final needsTemp = _closureAllocationNeedsTemp(node.function);
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if (needsTemp) {
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_allocateTemp(node);
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}
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_visitFunction(node);
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_freeTemp(node);
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if (needsTemp) {
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_freeTemp(node);
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}
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}
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@override
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@@ -1178,8 +1196,8 @@ class _Allocator extends RecursiveVisitor {
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@override
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void visitVariableSet(VariableSet node) {
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final v = node.variable;
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final bool needsTemp = locals.isCaptured(v) || v.isLate && v.isFinal;
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final bool needsTemp =
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node.parent is! ExpressionStatement && locals.isCaptured(node.variable);
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_visit(node, temps: needsTemp ? 1 : 0);
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}
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@@ -9,13 +9,12 @@ Class '', script = 'DART_SDK/pkg/dart2bytecode/testcases/async.dart'
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Field 'asyncInFieldInitializer', type = FunctionType (dart:async::Future < dart:core::int >) -> dart:async::Future < Null >, getter = 'get:asyncInFieldInitializer', reflectable, static, is-late, has-initializer
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initializer
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Bytecode {
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Entry 3
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Entry 2
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CheckStack 0
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PushConstant CP#0
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r2
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ReturnTOS
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}
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ConstantPool {
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@@ -530,7 +529,7 @@ Function 'closure', static, reflectable, debuggable
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return-type dynamic
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Bytecode {
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Entry 4
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Entry 3
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CheckStack 0
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AllocateContext 0, 2
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PopLocal r0
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@@ -544,7 +543,6 @@ Bytecode {
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r3
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PopLocal r2
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Push r2
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ReturnTOS
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@@ -23,7 +23,6 @@ Bytecode {
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r3
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PopLocal r2
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Push r2
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StoreLocal r3
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@@ -47,7 +46,7 @@ ConstantPool {
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}
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Closure DART_SDK/pkg/dart2bytecode/testcases/closures.dart::simpleClosure::'<anonymous closure>' (dart:core::int y) -> Null
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ClosureCode {
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Entry 3
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Entry 2
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Push FP[-6]
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LoadFieldTOS CP#1
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PopLocal r0
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@@ -780,7 +779,6 @@ Bytecode {
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r4
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PopLocal r3
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Push r3
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StoreLocal r4
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@@ -812,7 +810,6 @@ Bytecode {
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r3
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PopLocal r2
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Push r2
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StoreLocal r3
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@@ -888,10 +885,9 @@ L1:
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r2
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PopLocal r3
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Push r3
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Push r3
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PopLocal r2
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Push r2
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Push r2
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UncheckedClosureCall CP#10, 1
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Drop1
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Push r0
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@@ -905,7 +901,7 @@ L2:
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Closure DART_SDK/pkg/dart2bytecode/testcases/closures.dart::B::topLevel::Closure/0::'closure2' () -> void
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ClosureCode {
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Entry 3
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Entry 2
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Push FP[-5]
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LoadFieldTOS CP#1
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PopLocal r0
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@@ -1012,7 +1008,6 @@ L2:
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r4
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InstantiatedInterfaceCall CP#7, 2
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Drop1
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Push r3
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@@ -1020,7 +1015,6 @@ L2:
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r4
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InstantiatedInterfaceCall CP#7, 2
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Drop1
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Push r0
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@@ -1081,7 +1075,7 @@ ClosureCode {
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Closure DART_SDK/pkg/dart2bytecode/testcases/closures.dart::C::testForLoop::'<anonymous closure>' (dart:core::int ii) -> Null
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ClosureCode {
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Entry 3
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Entry 2
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Push FP[-6]
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LoadFieldTOS CP#4
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PopLocal r0
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@@ -1132,7 +1126,6 @@ L2:
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Push r0
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PushNull
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AllocateClosure
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StoreLocal r4
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PopLocal r3
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Push r3
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StoreLocal r4
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@@ -1168,7 +1161,7 @@ ConstantPool {
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}
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Closure DART_SDK/pkg/dart2bytecode/testcases/closures.dart::C::testForInLoop::'<anonymous closure>' () -> Null
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ClosureCode {
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Entry 3
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Entry 2
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Push FP[-5]
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LoadFieldTOS CP#7
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PopLocal r0
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@@ -1212,7 +1205,7 @@ Function 'foo', reflectable, debuggable
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return-type dynamic
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Bytecode {
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Entry 3
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Entry 2
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CheckStack 0
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AllocateContext 0, 1
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PopLocal r0
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@@ -1234,7 +1227,6 @@ L1:
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Push FP[-6]
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LoadTypeArgumentsField CP#1
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AllocateClosure
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StoreLocal r2
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ReturnTOS
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}
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Parameter flags: [2]
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@@ -1266,7 +1258,7 @@ Function 'bar', reflectable, debuggable
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return-type dynamic
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Bytecode {
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Entry 3
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Entry 2
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CheckStack 0
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AllocateContext 0, 1
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PopLocal r0
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@@ -1278,7 +1270,6 @@ Bytecode {
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Push FP[-5]
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LoadTypeArgumentsField CP#5
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AllocateClosure
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StoreLocal r2
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ReturnTOS
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}
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ConstantPool {
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@@ -1304,7 +1295,6 @@ ClosureCode {
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LoadContextVar 0, 0
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LoadTypeArgumentsField CP#5
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AllocateClosure
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StoreLocal r3
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||||
PopLocal r2
|
||||
Push r2
|
||||
Push r2
|
||||
|
||||
@@ -219,7 +219,6 @@ Try #0 start:
|
||||
Push r0
|
||||
PushNull
|
||||
AllocateClosure
|
||||
StoreLocal r5
|
||||
PopLocal r4
|
||||
Push r4
|
||||
Push r4
|
||||
@@ -270,7 +269,6 @@ Try #0 handler:
|
||||
Push r0
|
||||
PushNull
|
||||
AllocateClosure
|
||||
StoreLocal r5
|
||||
PopLocal r6
|
||||
Push r6
|
||||
ReturnTOS
|
||||
@@ -282,7 +280,7 @@ L1:
|
||||
ReturnTOS
|
||||
}
|
||||
ExceptionsTable {
|
||||
try-index 0, outer -1, start 20, end 58, handler 58, needs-stack-trace, types [CP#6]
|
||||
try-index 0, outer -1, start 20, end 56, handler 56, needs-stack-trace, types [CP#6]
|
||||
}
|
||||
ConstantPool {
|
||||
[0] = ClosureFunction 0
|
||||
@@ -309,7 +307,7 @@ ConstantPool {
|
||||
}
|
||||
Closure DART_SDK/pkg/dart2bytecode/testcases/try_blocks.dart::testTryCatch3::'foo' () -> void
|
||||
ClosureCode {
|
||||
Entry 6
|
||||
Entry 5
|
||||
Push FP[-5]
|
||||
LoadFieldTOS CP#1
|
||||
PopLocal r0
|
||||
@@ -323,7 +321,7 @@ Try #0 start:
|
||||
Jump L1
|
||||
Try #0 end:
|
||||
Try #0 handler:
|
||||
SetFrame 6
|
||||
SetFrame 5
|
||||
Push r2
|
||||
PopLocal r0
|
||||
MoveSpecial exception, r2
|
||||
@@ -594,7 +592,6 @@ Try #1 start:
|
||||
Push r0
|
||||
PushNull
|
||||
AllocateClosure
|
||||
StoreLocal r8
|
||||
PopLocal r7
|
||||
Push r7
|
||||
Push r7
|
||||
@@ -651,8 +648,8 @@ L3:
|
||||
ReturnTOS
|
||||
}
|
||||
ExceptionsTable {
|
||||
try-index 0, outer -1, start 53, end 136, handler 136, needs-stack-trace, synthetic, types [CP#11]
|
||||
try-index 1, outer 0, start 70, end 98, handler 98, needs-stack-trace, synthetic, types [CP#11]
|
||||
try-index 0, outer -1, start 53, end 134, handler 134, needs-stack-trace, synthetic, types [CP#11]
|
||||
try-index 1, outer 0, start 70, end 96, handler 96, needs-stack-trace, synthetic, types [CP#11]
|
||||
}
|
||||
ConstantPool {
|
||||
[0] = InterfaceCall 'dart:core::Object::==', ArgDesc num-args 2, num-type-args 0, names []
|
||||
@@ -697,7 +694,7 @@ Function 'testTryFinally3', static, reflectable, debuggable
|
||||
return-type dynamic
|
||||
|
||||
Bytecode {
|
||||
Entry 6
|
||||
Entry 5
|
||||
CheckStack 0
|
||||
AllocateContext 0, 1
|
||||
PopLocal r0
|
||||
@@ -713,12 +710,11 @@ Try #0 start:
|
||||
Push r0
|
||||
PushNull
|
||||
AllocateClosure
|
||||
StoreLocal r5
|
||||
PopLocal r2
|
||||
Jump L1
|
||||
Try #0 end:
|
||||
Try #0 handler:
|
||||
SetFrame 6
|
||||
SetFrame 5
|
||||
Push r3
|
||||
PopLocal r0
|
||||
MoveSpecial exception, r3
|
||||
@@ -750,7 +746,7 @@ L1:
|
||||
ReturnTOS
|
||||
}
|
||||
ExceptionsTable {
|
||||
try-index 0, outer -1, start 23, end 37, handler 37, needs-stack-trace, synthetic, types [CP#6]
|
||||
try-index 0, outer -1, start 23, end 35, handler 35, needs-stack-trace, synthetic, types [CP#6]
|
||||
}
|
||||
ConstantPool {
|
||||
[0] = ClosureFunction 0
|
||||
|
||||
Reference in New Issue
Block a user