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

src/mips/code-stubs-mips.cc

 // Copyright 2012 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_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1160 matching lines @@
   }
 
   // Retrieve the handler context, SP and FP.
   __ li(cp, Operand(pending_handler_context_address));
   __ lw(cp, MemOperand(cp));
   __ li(sp, Operand(pending_handler_sp_address));
   __ lw(sp, MemOperand(sp));
   __ li(fp, Operand(pending_handler_fp_address));
   __ lw(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 zero;
   __ Branch(&zero, eq, cp, Operand(zero_reg));
   __ sw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
   __ bind(&zero);
 
   // Compute the handler entry address and jump to it.
   __ li(a1, Operand(pending_handler_code_address));
   __ lw(a1, MemOperand(a1));
   __ li(a2, Operand(pending_handler_offset_address));
   __ lw(a2, MemOperand(a2));
@@ skipping 79 matching lines @@
   __ bind(&cont);
   __ push(t0);
 
   // Jump to a faked try block that does the invoke, with a faked catch
   // block that sets the pending exception.
   __ jmp(&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.
   __ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
                                       isolate)));
   __ sw(v0, MemOperand(t0));  // We come back from 'invoke'. result is in v0.
   __ LoadRoot(v0, Heap::kExceptionRootIndex);
   __ b(&exit);  // b exposes branch delay slot.
   __ nop();   // Branch delay slot nop.
 
-  // 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);
-  __ PushTryHandler(StackHandler::JS_ENTRY, 0);
+  __ PushStackHandler();
   // If an exception not caught by another handler occurs, this handler
   // returns control to the code after the bal(&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.
   __ LoadRoot(t1, Heap::kTheHoleValueRootIndex);
   __ li(t0, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
                                       isolate)));
   __ sw(t1, MemOperand(t0));
@@ skipping 24 matching lines @@
     ExternalReference entry(Builtins::kJSEntryTrampoline, masm->isolate());
     __ li(t0, Operand(entry));
   }
   __ lw(t9, MemOperand(t0));  // Deref address.
 
   // Call JSEntryTrampoline.
   __ addiu(t9, t9, Code::kHeaderSize - kHeapObjectTag);
   __ Call(t9);
 
   // Unlink this frame from the handler chain.
-  __ PopTryHandler();
+  __ PopStackHandler();
 
   __ bind(&exit);  // v0 holds result
   // Check if the current stack frame is marked as the outermost JS frame.
   Label non_outermost_js_2;
   __ pop(t1);
   __ Branch(&non_outermost_js_2,
             ne,
             t1,
             Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
   __ li(t1, Operand(ExternalReference(js_entry_sp)));
@@ skipping 4149 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS