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VM: [Kernel] Ensure we have the correct try-index when translating finally blocks
BUG=https://github.com/dart-lang/kernel_sdk/issues/25 R=kmillikin@google.com, vegorov@google.com Review URL: https://codereview.chromium.org/2487183002 .
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@ -840,7 +840,8 @@ class TryFinallyBlock {
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// Finalizers are executed outside of the try block hence
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// try depth of finalizers are one less than current try
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// depth.
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try_depth_(builder->try_depth_ - 1) {
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try_depth_(builder->try_depth_ - 1),
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try_index_(builder_->CurrentTryIndex()) {
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builder_->try_finally_block_ = this;
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}
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~TryFinallyBlock() { builder_->try_finally_block_ = outer_; }
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@ -848,6 +849,7 @@ class TryFinallyBlock {
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Statement* finalizer() const { return finalizer_; }
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intptr_t context_depth() const { return context_depth_; }
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intptr_t try_depth() const { return try_depth_; }
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intptr_t try_index() const { return try_index_; }
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TryFinallyBlock* outer() const { return outer_; }
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private:
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@ -856,6 +858,7 @@ class TryFinallyBlock {
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Statement* const finalizer_;
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const intptr_t context_depth_;
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const intptr_t try_depth_;
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const intptr_t try_index_;
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};
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@ -871,7 +874,8 @@ class TryCatchBlock {
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}
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~TryCatchBlock() { builder_->try_catch_block_ = outer_; }
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intptr_t TryIndex() { return try_index_; }
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intptr_t try_index() { return try_index_; }
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TryCatchBlock* outer() const { return outer_; }
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private:
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FlowGraphBuilder* builder_;
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@ -1853,6 +1857,7 @@ Fragment FlowGraphBuilder::TranslateFinallyFinalizers(
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TryFinallyBlock* outer_finally,
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intptr_t target_context_depth) {
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TryFinallyBlock* const saved_block = try_finally_block_;
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TryCatchBlock* const saved_try_catch_block = try_catch_block_;
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const intptr_t saved_depth = context_depth_;
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const intptr_t saved_try_depth = try_depth_;
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@ -1868,6 +1873,20 @@ Fragment FlowGraphBuilder::TranslateFinallyFinalizers(
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// block.
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instructions += AdjustContextTo(try_finally_block_->context_depth());
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// The to-be-translated finalizer has to have the correct try-index (namely
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// the one outside the try-finally block).
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bool changed_try_index = false;
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intptr_t target_try_index = try_finally_block_->try_index();
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while (CurrentTryIndex() != target_try_index) {
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try_catch_block_ = try_catch_block_->outer();
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changed_try_index = true;
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}
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if (changed_try_index) {
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JoinEntryInstr* entry = BuildJoinEntry();
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instructions += Goto(entry);
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instructions = Fragment(instructions.entry, entry);
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}
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Statement* finalizer = try_finally_block_->finalizer();
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try_finally_block_ = try_finally_block_->outer();
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@ -1881,13 +1900,14 @@ Fragment FlowGraphBuilder::TranslateFinallyFinalizers(
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}
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if (instructions.is_open() && target_context_depth != -1) {
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// A target context depth of -1 indicates that we the code after this
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// A target context depth of -1 indicates that the code after this
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// will not care about the context chain so we can leave it any way we
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// want after the last finalizer. That is used when returning.
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instructions += AdjustContextTo(target_context_depth);
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}
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try_finally_block_ = saved_block;
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try_catch_block_ = saved_try_catch_block;
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context_depth_ = saved_depth;
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try_depth_ = saved_try_depth;
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@ -2668,7 +2688,7 @@ intptr_t FlowGraphBuilder::CurrentTryIndex() {
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if (try_catch_block_ == NULL) {
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return CatchClauseNode::kInvalidTryIndex;
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} else {
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return try_catch_block_->TryIndex();
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return try_catch_block_->try_index();
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}
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}
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@ -5432,8 +5452,8 @@ void FlowGraphBuilder::VisitTryFinally(TryFinally* node) {
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// Fill in the body of the try.
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++try_depth_;
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{
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TryCatchBlock tcb(this, try_handler_index);
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TryFinallyBlock tfb(this, node->finalizer());
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TryCatchBlock tcb(this, try_handler_index);
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try_body += TranslateStatement(node->body());
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}
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--try_depth_;
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@ -144,6 +144,34 @@ testStopContinueInsideSwitch2() {
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}
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}
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testNestedFinally() {
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var events = '';
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try {
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try {
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events = '$events|start';
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} finally {
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events = '$events|start-catch';
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}
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try {
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try {
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return;
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} finally {
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events = '$events|inner';
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throw 0;
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}
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} finally {
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events = '$events|middle';
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}
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} catch (e) {
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events = '$events|outer-catch';
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} finally {
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events = '$events|outer-finally';
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}
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Expect.equals(
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events,
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'|start|start-catch|inner|middle|outer-catch|outer-finally');
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}
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main() {
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Expect.isTrue(testSimpleBreak() == 3);
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Expect.isTrue(testReturnFinally() == 42);
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@ -155,4 +183,5 @@ main() {
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Expect.isTrue(testStopContinueInsideLoop() == 42);
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Expect.isTrue(testStopContinueInsideSwitch() == 42);
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Expect.isTrue(testStopContinueInsideSwitch2() == 42);
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testNestedFinally();
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}
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