171 lines
6.2 KiB
C++
171 lines
6.2 KiB
C++
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// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#include "codegen-inl.h"
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#include "debug.h"
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namespace v8 { namespace internal {
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#define __ masm->
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static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
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RegList pointer_regs) {
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// Save the content of all general purpose registers in memory. This copy in
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// memory is later pushed onto the JS expression stack for the fake JS frame
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// generated and also to the C frame generated on top of that. In the JS
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// frame ONLY the registers containing pointers will be pushed on the
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// expression stack. This causes the GC to update these pointers so that
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// they will have the correct value when returning from the debugger.
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__ SaveRegistersToMemory(kJSCallerSaved);
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__ EnterInternalFrame();
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// Store the registers containing object pointers on the expression stack to
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// make sure that these are correctly updated during GC.
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// Use sp as base to push.
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__ CopyRegistersFromMemoryToStack(sp, pointer_regs);
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#ifdef DEBUG
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__ RecordComment("// Calling from debug break to runtime - come in - over");
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#endif
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__ mov(r0, Operand(0)); // no arguments
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__ mov(r1, Operand(ExternalReference::debug_break()));
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CEntryDebugBreakStub ceb;
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__ CallStub(&ceb);
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// Restore the register values containing object pointers from the expression
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// stack in the reverse order as they where pushed.
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// Use sp as base to pop.
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__ CopyRegistersFromStackToMemory(sp, r3, pointer_regs);
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__ LeaveInternalFrame();
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// Inlined ExitJSFrame ends here.
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// Finally restore all registers.
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__ RestoreRegistersFromMemory(kJSCallerSaved);
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// Now that the break point has been handled, resume normal execution by
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// jumping to the target address intended by the caller and that was
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// overwritten by the address of DebugBreakXXX.
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__ mov(ip, Operand(ExternalReference(Debug_Address::AfterBreakTarget())));
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__ ldr(ip, MemOperand(ip));
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__ Jump(ip);
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}
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void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC load (from ic-arm.cc).
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// ----------- S t a t e -------------
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// -- r0 : receiver
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// -- r2 : name
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// -- lr : return address
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// -- [sp] : receiver
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// -----------------------------------
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// Registers r0 and r2 contain objects that needs to be pushed on the
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// expression stack of the fake JS frame.
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Generate_DebugBreakCallHelper(masm, r0.bit() | r2.bit());
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}
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void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC store (from ic-arm.cc).
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// ----------- S t a t e -------------
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// -- r0 : receiver
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// -- r2 : name
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// -- lr : return address
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// -- [sp] : receiver
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// -----------------------------------
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// Registers r0 and r2 contain objects that needs to be pushed on the
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// expression stack of the fake JS frame.
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Generate_DebugBreakCallHelper(masm, r0.bit() | r2.bit());
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}
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void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
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// Keyed load IC not implemented on ARM.
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}
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void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
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// Keyed store IC not implemented on ARM.
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}
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void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC call (from ic-arm.cc)
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// ----------- S t a t e -------------
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// -- r0: number of arguments
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// -- r1: receiver
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// -- lr: return address
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// -----------------------------------
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// Register r1 contains an object that needs to be pushed on the expression
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// stack of the fake JS frame. r0 is the actual number of arguments not
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// encoded as a smi, therefore it cannot be on the expression stack of the
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// fake JS frame as it can easily be an invalid pointer (e.g. 1). r0 will be
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// pushed on the stack of the C frame and restored from there.
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Generate_DebugBreakCallHelper(masm, r1.bit());
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}
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void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) {
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// In places other than IC call sites it is expected that r0 is TOS which
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// is an object - this is not generally the case so this should be used with
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// care.
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Generate_DebugBreakCallHelper(masm, r0.bit());
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}
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void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
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// In places other than IC call sites it is expected that r0 is TOS which
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// is an object - this is not generally the case so this should be used with
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// care.
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Generate_DebugBreakCallHelper(masm, r0.bit());
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}
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void Debug::GenerateReturnDebugBreakEntry(MacroAssembler* masm) {
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// Generate nothing as this handling of debug break return is not done this
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// way on ARM - yet.
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}
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void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) {
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// Generate nothing as CodeStub CallFunction is not used on ARM.
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}
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#undef __
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} } // namespace v8::internal
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