src/ia32/code-stubs-ia32.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.

#if V8_TARGET_ARCH_IA32

#include "src/api-arguments-inl.h"
#include "src/assembler-inl.h"
#include "src/base/bits.h"
#include "src/bootstrapper.h"
#include "src/code-stubs.h"
#include "src/frame-constants.h"
#include "src/frames.h"
#include "src/ic/ic.h"
#include "src/ic/stub-cache.h"
#include "src/isolate.h"
#include "src/macro-assembler.h"
#include "src/objects/api-callbacks.h"
#include "src/regexp/jsregexp.h"
#include "src/regexp/regexp-macro-assembler.h"
#include "src/runtime/runtime.h"

namespace v8 {
namespace internal {

#define __ ACCESS_MASM(masm)

// Called with the native C calling convention. The corresponding function
// signature is:
//
//  using JSEntryFunction = GeneratedCode<Object*(
//      Object * new_target, Object * target, Object * receiver, int argc,
//      Object*** args, Address root_register_value)>;
void JSEntryStub::Generate(MacroAssembler* masm) {
  Label invoke, handler_entry, exit;
  Label not_outermost_js, not_outermost_js_2;

  {  // NOLINT. Scope block confuses linter.
    NoRootArrayScope uninitialized_root_register(masm);

    // Set up frame.
    __ push(ebp);
    __ mov(ebp, esp);

    // Push marker in two places.
    StackFrame::Type marker = type();
    __ push(Immediate(StackFrame::TypeToMarker(marker)));  // marker
    ExternalReference context_address =
        ExternalReference::Create(IsolateAddressId::kContextAddress, isolate());
    __ push(Operand(context_address.address(),
                    RelocInfo::EXTERNAL_REFERENCE));  // context
    // Save callee-saved registers (C calling conventions).
    __ push(edi);
    __ push(esi);
    __ push(ebx);

    // Initialize the root register based on the given Isolate* argument.
    // C calling convention. The sixth argument is passed on the stack.
    __ mov(kRootRegister,
           Operand(ebp, EntryFrameConstants::kRootRegisterValueOffset));
  }

  // Save copies of the top frame descriptor on the stack.
  ExternalReference c_entry_fp =
      ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate());
  __ push(__ ExternalReferenceAsOperand(c_entry_fp, edi));

  // If this is the outermost JS call, set js_entry_sp value.
  ExternalReference js_entry_sp =
      ExternalReference::Create(IsolateAddressId::kJSEntrySPAddress, isolate());
  __ cmp(__ ExternalReferenceAsOperand(js_entry_sp, edi), Immediate(0));
  __ j(not_equal, &not_outermost_js, Label::kNear);
  __ mov(__ ExternalReferenceAsOperand(js_entry_sp, edi), ebp);
  __ push(Immediate(StackFrame::OUTERMOST_JSENTRY_FRAME));
  __ jmp(&invoke, Label::kNear);
  __ bind(&not_outermost_js);
  __ push(Immediate(StackFrame::INNER_JSENTRY_FRAME));

  // 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.
  ExternalReference pending_exception = ExternalReference::Create(
      IsolateAddressId::kPendingExceptionAddress, isolate());
  __ mov(__ ExternalReferenceAsOperand(pending_exception, edi), eax);
  __ mov(eax, Immediate(isolate()->factory()->exception()));
  __ jmp(&exit);

  // Invoke: Link this frame into the handler chain.
  __ bind(&invoke);
  __ PushStackHandler(edi);

  // Invoke the function by calling through JS entry trampoline builtin and
  // pop the faked function when we return. Notice that we cannot store a
  // reference to the trampoline code directly in this stub, because the
  // builtin stubs may not have been generated yet.
  __ Call(EntryTrampoline(), RelocInfo::CODE_TARGET);

  // Unlink this frame from the handler chain.
  __ PopStackHandler(edi);

  __ bind(&exit);

  // Check if the current stack frame is marked as the outermost JS frame.
  __ pop(edi);
  __ cmp(edi, Immediate(StackFrame::OUTERMOST_JSENTRY_FRAME));
  __ j(not_equal, &not_outermost_js_2);
  __ mov(__ ExternalReferenceAsOperand(js_entry_sp, edi), Immediate(0));
  __ bind(&not_outermost_js_2);

  // Restore the top frame descriptor from the stack.
  __ pop(__ ExternalReferenceAsOperand(c_entry_fp, edi));

  // Restore callee-saved registers (C calling conventions).
  __ pop(ebx);
  __ pop(esi);
  __ pop(edi);
  __ add(esp, Immediate(2 * kPointerSize));  // remove markers

  // Restore frame pointer and return.
  __ pop(ebp);
  __ ret(0);
}

#undef __

}  // namespace internal
}  // namespace v8

#endif  // V8_TARGET_ARCH_IA32