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