1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
9 #include "src/codegen.h"
10 #include "src/debug.h"
15 void BreakLocation::SetDebugBreakAtReturn() {
16 // Patch the code changing the return from JS function sequence from
21 // to a call to the debug break return code.
22 // this uses a FIXED_SEQUENCE to load an address constant
29 CodePatcher patcher(pc(), Assembler::kJSReturnSequenceInstructions);
30 Assembler::BlockTrampolinePoolScope block_trampoline_pool(patcher.masm());
33 Operand(reinterpret_cast<intptr_t>(debug_info_->GetIsolate()
37 patcher.masm()->mtctr(v8::internal::r0);
38 patcher.masm()->bctrl();
39 patcher.masm()->bkpt(0);
43 void BreakLocation::SetDebugBreakAtSlot() {
44 DCHECK(IsDebugBreakSlot());
45 // Patch the code changing the debug break slot code from
53 // to a call to the debug break code, using a FIXED_SEQUENCE.
59 CodePatcher patcher(pc(), Assembler::kDebugBreakSlotInstructions);
60 Assembler::BlockTrampolinePoolScope block_trampoline_pool(patcher.masm());
63 Operand(reinterpret_cast<intptr_t>(
64 debug_info_->GetIsolate()->builtins()->Slot_DebugBreak()->entry())));
65 patcher.masm()->mtctr(v8::internal::r0);
66 patcher.masm()->bctrl();
70 #define __ ACCESS_MASM(masm)
73 static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
75 RegList non_object_regs) {
77 FrameScope scope(masm, StackFrame::INTERNAL);
79 // Load padding words on stack.
80 __ LoadSmiLiteral(ip, Smi::FromInt(LiveEdit::kFramePaddingValue));
81 for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
84 __ LoadSmiLiteral(ip, Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
87 // Store the registers containing live values on the expression stack to
88 // make sure that these are correctly updated during GC. Non object values
89 // are stored as a smi causing it to be untouched by GC.
90 DCHECK((object_regs & ~kJSCallerSaved) == 0);
91 DCHECK((non_object_regs & ~kJSCallerSaved) == 0);
92 DCHECK((object_regs & non_object_regs) == 0);
93 if ((object_regs | non_object_regs) != 0) {
94 for (int i = 0; i < kNumJSCallerSaved; i++) {
95 int r = JSCallerSavedCode(i);
97 if ((non_object_regs & (1 << r)) != 0) {
98 if (FLAG_debug_code) {
99 __ TestUnsignedSmiCandidate(reg, r0);
100 __ Assert(eq, kUnableToEncodeValueAsSmi, cr0);
105 __ MultiPush(object_regs | non_object_regs);
109 __ RecordComment("// Calling from debug break to runtime - come in - over");
111 __ mov(r3, Operand::Zero()); // no arguments
112 __ mov(r4, Operand(ExternalReference::debug_break(masm->isolate())));
114 CEntryStub ceb(masm->isolate(), 1);
117 // Restore the register values from the expression stack.
118 if ((object_regs | non_object_regs) != 0) {
119 __ MultiPop(object_regs | non_object_regs);
120 for (int i = 0; i < kNumJSCallerSaved; i++) {
121 int r = JSCallerSavedCode(i);
123 if ((non_object_regs & (1 << r)) != 0) {
126 if (FLAG_debug_code &&
127 (((object_regs | non_object_regs) & (1 << r)) == 0)) {
128 __ mov(reg, Operand(kDebugZapValue));
133 // Don't bother removing padding bytes pushed on the stack
134 // as the frame is going to be restored right away.
136 // Leave the internal frame.
139 // Now that the break point has been handled, resume normal execution by
140 // jumping to the target address intended by the caller and that was
141 // overwritten by the address of DebugBreakXXX.
142 ExternalReference after_break_target =
143 ExternalReference::debug_after_break_target_address(masm->isolate());
144 __ mov(ip, Operand(after_break_target));
145 __ LoadP(ip, MemOperand(ip));
146 __ JumpToJSEntry(ip);
150 void DebugCodegen::GenerateCallICStubDebugBreak(MacroAssembler* masm) {
151 // Register state for CallICStub
152 // ----------- S t a t e -------------
154 // -- r6 : slot in feedback array (smi)
155 // -----------------------------------
156 Generate_DebugBreakCallHelper(masm, r4.bit() | r6.bit(), 0);
160 void DebugCodegen::GenerateLoadICDebugBreak(MacroAssembler* masm) {
161 // Calling convention for IC load (from ic-ppc.cc).
162 Register receiver = LoadDescriptor::ReceiverRegister();
163 Register name = LoadDescriptor::NameRegister();
164 RegList regs = receiver.bit() | name.bit();
165 if (FLAG_vector_ics) {
166 regs |= VectorLoadICTrampolineDescriptor::SlotRegister().bit();
168 Generate_DebugBreakCallHelper(masm, regs, 0);
172 void DebugCodegen::GenerateStoreICDebugBreak(MacroAssembler* masm) {
173 // Calling convention for IC store (from ic-ppc.cc).
174 Register receiver = StoreDescriptor::ReceiverRegister();
175 Register name = StoreDescriptor::NameRegister();
176 Register value = StoreDescriptor::ValueRegister();
177 Generate_DebugBreakCallHelper(masm, receiver.bit() | name.bit() | value.bit(),
182 void DebugCodegen::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
183 // Calling convention for keyed IC load (from ic-ppc.cc).
184 GenerateLoadICDebugBreak(masm);
188 void DebugCodegen::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
189 // Calling convention for IC keyed store call (from ic-ppc.cc).
190 Register receiver = StoreDescriptor::ReceiverRegister();
191 Register name = StoreDescriptor::NameRegister();
192 Register value = StoreDescriptor::ValueRegister();
193 Generate_DebugBreakCallHelper(masm, receiver.bit() | name.bit() | value.bit(),
198 void DebugCodegen::GenerateCompareNilICDebugBreak(MacroAssembler* masm) {
199 // Register state for CompareNil IC
200 // ----------- S t a t e -------------
202 // -----------------------------------
203 Generate_DebugBreakCallHelper(masm, r3.bit(), 0);
207 void DebugCodegen::GenerateReturnDebugBreak(MacroAssembler* masm) {
208 // In places other than IC call sites it is expected that r3 is TOS which
209 // is an object - this is not generally the case so this should be used with
211 Generate_DebugBreakCallHelper(masm, r3.bit(), 0);
215 void DebugCodegen::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) {
216 // Register state for CallFunctionStub (from code-stubs-ppc.cc).
217 // ----------- S t a t e -------------
219 // -----------------------------------
220 Generate_DebugBreakCallHelper(masm, r4.bit(), 0);
224 void DebugCodegen::GenerateCallConstructStubDebugBreak(MacroAssembler* masm) {
225 // Calling convention for CallConstructStub (from code-stubs-ppc.cc)
226 // ----------- S t a t e -------------
227 // -- r3 : number of arguments (not smi)
228 // -- r4 : constructor function
229 // -----------------------------------
230 Generate_DebugBreakCallHelper(masm, r4.bit(), r3.bit());
234 void DebugCodegen::GenerateCallConstructStubRecordDebugBreak(
235 MacroAssembler* masm) {
236 // Calling convention for CallConstructStub (from code-stubs-ppc.cc)
237 // ----------- S t a t e -------------
238 // -- r3 : number of arguments (not smi)
239 // -- r4 : constructor function
240 // -- r5 : feedback array
241 // -- r6 : feedback slot (smi)
242 // -----------------------------------
243 Generate_DebugBreakCallHelper(masm, r4.bit() | r5.bit() | r6.bit(), r3.bit());
247 void DebugCodegen::GenerateSlot(MacroAssembler* masm) {
248 // Generate enough nop's to make space for a call instruction. Avoid emitting
249 // the trampoline pool in the debug break slot code.
250 Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm);
251 Label check_codesize;
252 __ bind(&check_codesize);
253 __ RecordDebugBreakSlot();
254 for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
255 __ nop(MacroAssembler::DEBUG_BREAK_NOP);
257 DCHECK_EQ(Assembler::kDebugBreakSlotInstructions,
258 masm->InstructionsGeneratedSince(&check_codesize));
262 void DebugCodegen::GenerateSlotDebugBreak(MacroAssembler* masm) {
263 // In the places where a debug break slot is inserted no registers can contain
265 Generate_DebugBreakCallHelper(masm, 0, 0);
269 void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
274 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
275 ExternalReference restarter_frame_function_slot =
276 ExternalReference::debug_restarter_frame_function_pointer_address(
278 __ mov(ip, Operand(restarter_frame_function_slot));
279 __ li(r4, Operand::Zero());
280 __ StoreP(r4, MemOperand(ip, 0));
282 // Load the function pointer off of our current stack frame.
283 __ LoadP(r4, MemOperand(fp, StandardFrameConstants::kConstantPoolOffset -
286 // Pop return address and frame
287 __ LeaveFrame(StackFrame::INTERNAL);
289 // Load context from the function.
290 __ LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
292 // Get function code.
293 __ LoadP(ip, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
294 __ LoadP(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
295 __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
297 // Re-run JSFunction, r4 is function, cp is context.
302 const bool LiveEdit::kFrameDropperSupported = true;
306 } // namespace v8::internal
308 #endif // V8_TARGET_ARCH_PPC