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Unified Diff: src/arm64/full-codegen-arm64.cc

Issue 867153003: new classes: special construct stub for derived classs and TDZ for `this`. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: CHECK_OK fixed Created 5 years, 11 months ago
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Index: src/arm64/full-codegen-arm64.cc
diff --git a/src/arm64/full-codegen-arm64.cc b/src/arm64/full-codegen-arm64.cc
index 491e9000d39fbd2ce62bddffb3971385f81ab87b..62b5451668ac0292cc5c0355d34d610624d7340e 100644
--- a/src/arm64/full-codegen-arm64.cc
+++ b/src/arm64/full-codegen-arm64.cc
@@ -1518,6 +1518,10 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy) {
bool skip_init_check;
if (var->scope()->DeclarationScope() != scope()->DeclarationScope()) {
skip_init_check = false;
+ } else if (var->is_this()) {
+ CHECK((info_->shared_info()->kind() & kSubclassConstructor) != 0);
+ // TODO(dslomov): implement 'this' hole check elimination.
+ skip_init_check = false;
} else {
// Check that we always have valid source position.
DCHECK(var->initializer_position() != RelocInfo::kNoPosition);
@@ -2938,6 +2942,16 @@ void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
EmitLoadSuperConstructor(super_ref);
__ push(result_register());
+ Variable* this_var = super_ref->this_var()->var();
+
+ GetVar(x0, this_var);
+ Label uninitialized_this;
+ __ JumpIfRoot(x0, Heap::kTheHoleValueRootIndex, &uninitialized_this);
+ __ Mov(x0, Operand(this_var->name()));
+ __ Push(x0);
+ __ CallRuntime(Runtime::kThrowReferenceError, 1);
+ __ bind(&uninitialized_this);
+
// Push the arguments ("left-to-right") on the stack.
ZoneList<Expression*>* args = expr->arguments();
int arg_count = args->length();
@@ -2972,8 +2986,7 @@ void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
RecordJSReturnSite(expr);
- // TODO(dslomov): implement TDZ for `this`.
- EmitVariableAssignment(super_ref->this_var()->var(), Token::ASSIGN);
+ EmitVariableAssignment(this_var, Token::INIT_CONST);
context()->Plug(x0);
}
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