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PPC: [runtime] Throw exception for derived constructors in correct context.

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Port c86f1897ac

Original commit message:
    When derived constructors return a non-object (or not undefined) we
    currently throw an exception directly in the callee context. This was
    achieved by desugaring the return statement for derived classes. To
    be spec compliamnt a separate ConstructStubForDerived is introduced.
    Instead of trowing directly, the desugared return statement inside
    a derived constructor only returns an integer to indicate an incompatible
    result.

R=cbruni@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=v8:4509
LOG=n

Review URL: https://codereview.chromium.org/1595593002

Cr-Commit-Position: refs/heads/master@{#33341}
This commit is contained in:
mbrandy 2016-01-15 11:04:25 -08:00 committed by Commit bot
parent 316ef28676
commit bbb95fba40
1 changed files with 19 additions and 5 deletions
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24
src/ppc/builtins-ppc.cc
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@ -421,7 +421,8 @@ void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
static void Generate_JSConstructStubHelper(MacroAssembler* masm,
bool is_api_function,
bool create_implicit_receiver) {
bool create_implicit_receiver,
bool check_derived_construct) {
// ----------- S t a t e -------------
// -- r3 : number of arguments
// -- r4 : constructor function
@ -680,6 +681,19 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
// Leave construct frame.
}
// ES6 9.2.2. Step 13+
// Check that the result is not a Smi, indicating that the constructor result
// from a derived class is neither undefined nor an Object.
if (check_derived_construct) {
Label dont_throw;
__ JumpIfNotSmi(r3, &dont_throw);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ CallRuntime(Runtime::kThrowDerivedConstructorReturnedNonObject);
}
__ bind(&dont_throw);
}
__ SmiToPtrArrayOffset(r4, r4);
__ add(sp, sp, r4);
__ addi(sp, sp, Operand(kPointerSize));
@ -691,23 +705,23 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, true);
Generate_JSConstructStubHelper(masm, false, true, false);
}
void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, true, true);
Generate_JSConstructStubHelper(masm, true, true, false);
}
void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, false);
Generate_JSConstructStubHelper(masm, false, false, false);
}
void Builtins::Generate_JSBuiltinsConstructStubForDerived(
MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, false, false);
Generate_JSConstructStubHelper(masm, false, false, true);
}