Move stack unwinding logic into the runtime.

src/x64/macro-assembler-x64.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_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 2954 matching lines @@
 
 
 void MacroAssembler::PopTryHandler() {
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
   Pop(ExternalOperand(handler_address));
   addp(rsp, Immediate(StackHandlerConstants::kSize - kPointerSize));
 }
 
 
-void MacroAssembler::JumpToHandlerEntry() {
-  // Compute the handler entry address and jump to it.  The handler table is
-  // a fixed array of (smi-tagged) code offsets.
-  // rax = exception, rdi = code object, rdx = state.
-  movp(rbx, FieldOperand(rdi, Code::kHandlerTableOffset));
-  shrp(rdx, Immediate(StackHandler::kKindWidth));
-  movp(rdx,
-       FieldOperand(rbx, rdx, times_pointer_size, FixedArray::kHeaderSize));
-  SmiToInteger64(rdx, rdx);
-  leap(rdi, FieldOperand(rdi, rdx, times_1, Code::kHeaderSize));
-  jmp(rdi);
-}
-
-
-void MacroAssembler::Throw(Register value) {
-  // Adjust this code if not the case.
-  STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize +
-                                                kFPOnStackSize);
-  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
-  STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
-
-  // The exception is expected in rax.
-  if (!value.is(rax)) {
-    movp(rax, value);
-  }
-  // Drop the stack pointer to the top of the top handler.
-  ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
-  movp(rsp, ExternalOperand(handler_address));
-  // Restore the next handler.
-  Pop(ExternalOperand(handler_address));
-
-  // Remove the code object and state, compute the handler address in rdi.
-  Pop(rdi);  // Code object.
-  Pop(rdx);  // Offset and state.
-
-  // Restore the context and frame pointer.
-  Pop(rsi);  // Context.
-  popq(rbp);  // Frame pointer.
-
-  // If the handler is a JS frame, restore the context to the frame.
-  // (kind == ENTRY) == (rbp == 0) == (rsi == 0), so we could test either
-  // rbp or rsi.
-  Label skip;
-  testp(rsi, rsi);
-  j(zero, &skip, Label::kNear);
-  movp(Operand(rbp, StandardFrameConstants::kContextOffset), rsi);
-  bind(&skip);
-
-  JumpToHandlerEntry();
-}
-
-
-void MacroAssembler::ThrowUncatchable(Register value) {
-  // Adjust this code if not the case.
-  STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize +
-                                                kFPOnStackSize);
-  STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
-  STATIC_ASSERT(StackHandlerConstants::kCodeOffset == 1 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kStateOffset == 2 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kContextOffset == 3 * kPointerSize);
-  STATIC_ASSERT(StackHandlerConstants::kFPOffset == 4 * kPointerSize);
-
-  // The exception is expected in rax.
-  if (!value.is(rax)) {
-    movp(rax, value);
-  }
-  // Drop the stack pointer to the top of the top stack handler.
-  ExternalReference handler_address(Isolate::kHandlerAddress, isolate());
-  Load(rsp, handler_address);
-
-  // Unwind the handlers until the top ENTRY handler is found.
-  Label fetch_next, check_kind;
-  jmp(&check_kind, Label::kNear);
-  bind(&fetch_next);
-  movp(rsp, Operand(rsp, StackHandlerConstants::kNextOffset));
-
-  bind(&check_kind);
-  STATIC_ASSERT(StackHandler::JS_ENTRY == 0);
-  testl(Operand(rsp, StackHandlerConstants::kStateOffset),
-        Immediate(StackHandler::KindField::kMask));
-  j(not_zero, &fetch_next);
-
-  // Set the top handler address to next handler past the top ENTRY handler.
-  Pop(ExternalOperand(handler_address));
-
-  // Remove the code object and state, compute the handler address in rdi.
-  Pop(rdi);  // Code object.
-  Pop(rdx);  // Offset and state.
-
-  // Clear the context pointer and frame pointer (0 was saved in the handler).
-  Pop(rsi);
-  popq(rbp);
-
-  JumpToHandlerEntry();
-}
-
-
 void MacroAssembler::Ret() {
   ret(0);
 }
 
 
 void MacroAssembler::Ret(int bytes_dropped, Register scratch) {
   if (is_uint16(bytes_dropped)) {
     ret(bytes_dropped);
   } else {
     PopReturnAddressTo(scratch);
@@ skipping 2049 matching lines @@
   if (mag.shift > 0) sarl(rdx, Immediate(mag.shift));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64