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-rw-r--r--compiler/optimizing/escape.h85
1 files changed, 83 insertions, 2 deletions
diff --git a/compiler/optimizing/escape.h b/compiler/optimizing/escape.h
index 75e37b0551..5402cb1763 100644
--- a/compiler/optimizing/escape.h
+++ b/compiler/optimizing/escape.h
@@ -26,6 +26,59 @@ class HInstruction;
* allocation is visible outside ('escapes') its immediate method context.
*/
+// A visitor for seeing all instructions escape analysis considers escaping.
+// Called with each user of the reference passed to 'VisitEscapes'. Return true
+// to continue iteration and false to stop.
+class EscapeVisitor {
+ public:
+ virtual ~EscapeVisitor() {}
+ virtual bool Visit(HInstruction* escape) = 0;
+ bool operator()(HInstruction* user) {
+ return Visit(user);
+ }
+};
+
+// An explicit EscapeVisitor for lambdas
+template <typename F>
+class LambdaEscapeVisitor final : public EscapeVisitor {
+ public:
+ explicit LambdaEscapeVisitor(F f) : func_(f) {}
+ bool Visit(HInstruction* escape) override {
+ return func_(escape);
+ }
+
+ private:
+ F func_;
+};
+
+// This functor is used with the escape-checking functions. If the NoEscape
+// function returns true escape analysis will consider 'user' to not have
+// escaped 'reference'. This allows clients with additional information to
+// supplement the escape-analysis. If the NoEscape function returns false then
+// the normal escape-checking code will be used to determine whether or not
+// 'reference' escapes.
+class NoEscapeCheck {
+ public:
+ virtual ~NoEscapeCheck() {}
+ virtual bool NoEscape(HInstruction* reference, HInstruction* user) = 0;
+ bool operator()(HInstruction* ref, HInstruction* user) {
+ return NoEscape(ref, user);
+ }
+};
+
+// An explicit NoEscapeCheck for use with c++ lambdas.
+template <typename F>
+class LambdaNoEscapeCheck final : public NoEscapeCheck {
+ public:
+ explicit LambdaNoEscapeCheck(F f) : func_(f) {}
+ bool NoEscape(HInstruction* ref, HInstruction* user) override {
+ return func_(ref, user);
+ }
+
+ private:
+ F func_;
+};
+
/*
* Performs escape analysis on the given instruction, typically a reference to an
* allocation. The method assigns true to parameter 'is_singleton' if the reference
@@ -52,16 +105,44 @@ class HInstruction;
* analysis is applied to the user instead.
*/
void CalculateEscape(HInstruction* reference,
- bool (*no_escape)(HInstruction*, HInstruction*),
+ NoEscapeCheck& no_escape,
/*out*/ bool* is_singleton,
/*out*/ bool* is_singleton_and_not_returned,
/*out*/ bool* is_singleton_and_not_deopt_visible);
+inline void CalculateEscape(HInstruction* reference,
+ bool (*no_escape_fn)(HInstruction*, HInstruction*),
+ /*out*/ bool* is_singleton,
+ /*out*/ bool* is_singleton_and_not_returned,
+ /*out*/ bool* is_singleton_and_not_deopt_visible) {
+ LambdaNoEscapeCheck esc(no_escape_fn);
+ LambdaNoEscapeCheck noop_esc([](HInstruction*, HInstruction*) { return false; });
+ CalculateEscape(reference,
+ no_escape_fn == nullptr ? static_cast<NoEscapeCheck&>(noop_esc) : esc,
+ is_singleton,
+ is_singleton_and_not_returned,
+ is_singleton_and_not_deopt_visible);
+}
+
+/*
+ * Performs escape analysis and visits each escape of the reference. Does not try to calculate any
+ * overall information about the method. Escapes are calculated in the same way as CalculateEscape.
+ *
+ * The escape_visitor should return true to continue visiting, false otherwise.
+ */
+void VisitEscapes(HInstruction* reference, EscapeVisitor& escape_visitor);
+
/*
* Convenience method for testing the singleton and not returned properties at once.
* Callers should be aware that this method invokes the full analysis at each call.
*/
-bool DoesNotEscape(HInstruction* reference, bool (*no_escape)(HInstruction*, HInstruction*));
+bool DoesNotEscape(HInstruction* reference, NoEscapeCheck& no_escape);
+
+inline bool DoesNotEscape(HInstruction* reference,
+ bool (*no_escape_fn)(HInstruction*, HInstruction*)) {
+ LambdaNoEscapeCheck<typeof(no_escape_fn)> esc(no_escape_fn);
+ return DoesNotEscape(reference, esc);
+}
} // namespace art