PPC: Switch full-codegen from StackHandlers to handler table.

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1140 matching lines @@
   }
 
   // Retrieve the handler context, SP and FP.
   __ mov(cp, Operand(pending_handler_context_address));
   __ LoadP(cp, MemOperand(cp));
   __ mov(sp, Operand(pending_handler_sp_address));
   __ LoadP(sp, MemOperand(sp));
   __ mov(fp, Operand(pending_handler_fp_address));
   __ LoadP(fp, MemOperand(fp));
 
-  // If the handler is a JS frame, restore the context to the frame.
-  // (kind == ENTRY) == (fp == 0) == (cp == 0), so we could test either fp
-  // or cp.
+  // If the handler is a JS frame, restore the context to the frame. Note that
+  // the context will be set to (cp == 0) for non-JS frames.
   Label skip;
   __ cmpi(cp, Operand::Zero());
   __ beq(&skip);
   __ StoreP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   __ bind(&skip);
 
   // Compute the handler entry address and jump to it.
   __ mov(r4, Operand(pending_handler_code_address));
   __ LoadP(r4, MemOperand(r4));
   __ mov(r5, Operand(pending_handler_offset_address));
@@ skipping 69 matching lines @@
   __ push(ip);  // frame-type
 
   // Jump to a faked try block that does the invoke, with a faked catch
   // block that sets the pending exception.
   __ b(&invoke);
 
   __ bind(&handler_entry);
   handler_offset_ = handler_entry.pos();
   // Caught exception: Store result (exception) in the pending exception
   // field in the JSEnv and return a failure sentinel.  Coming in here the
-  // fp will be invalid because the PushTryHandler below sets it to 0 to
+  // fp will be invalid because the PushStackHandler below sets it to 0 to
   // signal the existence of the JSEntry frame.
   __ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
                                        isolate())));
 
   __ StoreP(r3, MemOperand(ip));
   __ LoadRoot(r3, Heap::kExceptionRootIndex);
   __ b(&exit);
 
-  // Invoke: Link this frame into the handler chain.  There's only one
-  // handler block in this code object, so its index is 0.
+  // Invoke: Link this frame into the handler chain.
   __ bind(&invoke);
-  // Must preserve r0-r4, r5-r7 are available. (needs update for PPC)
-  __ PushTryHandler(StackHandler::JS_ENTRY, 0);
+  // Must preserve r3-r7.
+  __ PushStackHandler();
   // If an exception not caught by another handler occurs, this handler
   // returns control to the code after the b(&invoke) above, which
   // restores all kCalleeSaved registers (including cp and fp) to their
   // saved values before returning a failure to C.
 
   // Clear any pending exceptions.
   __ mov(r8, Operand(isolate()->factory()->the_hole_value()));
   __ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
                                        isolate())));
   __ StoreP(r8, MemOperand(ip));
@@ skipping 18 matching lines @@
   }
   __ LoadP(ip, MemOperand(ip));  // deref address
 
   // Branch and link to JSEntryTrampoline.
   // the address points to the start of the code object, skip the header
   __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
   __ mtctr(ip);
   __ bctrl();  // make the call
 
   // Unlink this frame from the handler chain.
-  __ PopTryHandler();
+  __ PopStackHandler();
 
   __ bind(&exit);  // r3 holds result
   // Check if the current stack frame is marked as the outermost JS frame.
   Label non_outermost_js_2;
   __ pop(r8);
   __ CmpSmiLiteral(r8, Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME), r0);
   __ bne(&non_outermost_js_2);
   __ mov(r9, Operand::Zero());
   __ mov(r8, Operand(ExternalReference(js_entry_sp)));
   __ StoreP(r9, MemOperand(r8));
@@ skipping 4272 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_PPC