Update V8 to version 4.1.0.21
This is a cherry-pick of all commits up to and including the
4.1.0.21 cherry-pick in Chromium.
Original commit message:
Version 4.1.0.21 (cherry-pick)
Merged 206e9136bde0f2b5ae8cb77afbb1e7833e5bd412
Unlink pages from the space page list after evacuation.
BUG=430201
LOG=N
R=jkummerow@chromium.org
Review URL: https://codereview.chromium.org/953813002
Cr-Commit-Position: refs/branch-heads/4.1@{#22}
Cr-Branched-From: 2e08d2a7aa9d65d269d8c57aba82eb38a8cb0a18-refs/heads/candidates@{#25353}
---
FPIIM-449
Change-Id: I8c23c7bbb70772b4858fe8a47b64fa97ee0d1f8c
diff --git a/src/ppc/simulator-ppc.h b/src/ppc/simulator-ppc.h
new file mode 100644
index 0000000..98fe9a5
--- /dev/null
+++ b/src/ppc/simulator-ppc.h
@@ -0,0 +1,413 @@
+// Copyright 2014 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.
+
+
+// Declares a Simulator for PPC instructions if we are not generating a native
+// PPC binary. This Simulator allows us to run and debug PPC code generation on
+// regular desktop machines.
+// V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
+// which will start execution in the Simulator or forwards to the real entry
+// on a PPC HW platform.
+
+#ifndef V8_PPC_SIMULATOR_PPC_H_
+#define V8_PPC_SIMULATOR_PPC_H_
+
+#include "src/allocation.h"
+
+#if !defined(USE_SIMULATOR)
+// Running without a simulator on a native ppc platform.
+
+namespace v8 {
+namespace internal {
+
+// When running without a simulator we call the entry directly.
+#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
+ (entry(p0, p1, p2, p3, p4))
+
+typedef int (*ppc_regexp_matcher)(String*, int, const byte*, const byte*, int*,
+ int, Address, int, void*, Isolate*);
+
+
+// Call the generated regexp code directly. The code at the entry address
+// should act as a function matching the type ppc_regexp_matcher.
+// The ninth argument is a dummy that reserves the space used for
+// the return address added by the ExitFrame in native calls.
+#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7, p8) \
+ (FUNCTION_CAST<ppc_regexp_matcher>(entry)(p0, p1, p2, p3, p4, p5, p6, p7, \
+ NULL, p8))
+
+// The stack limit beyond which we will throw stack overflow errors in
+// generated code. Because generated code on ppc uses the C stack, we
+// just use the C stack limit.
+class SimulatorStack : public v8::internal::AllStatic {
+ public:
+ static inline uintptr_t JsLimitFromCLimit(v8::internal::Isolate* isolate,
+ uintptr_t c_limit) {
+ USE(isolate);
+ return c_limit;
+ }
+
+ static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
+ return try_catch_address;
+ }
+
+ static inline void UnregisterCTryCatch() {}
+};
+}
+} // namespace v8::internal
+
+#else // !defined(USE_SIMULATOR)
+// Running with a simulator.
+
+#include "src/assembler.h"
+#include "src/hashmap.h"
+#include "src/ppc/constants-ppc.h"
+
+namespace v8 {
+namespace internal {
+
+class CachePage {
+ public:
+ static const int LINE_VALID = 0;
+ static const int LINE_INVALID = 1;
+
+ static const int kPageShift = 12;
+ static const int kPageSize = 1 << kPageShift;
+ static const int kPageMask = kPageSize - 1;
+ static const int kLineShift = 2; // The cache line is only 4 bytes right now.
+ static const int kLineLength = 1 << kLineShift;
+ static const int kLineMask = kLineLength - 1;
+
+ CachePage() { memset(&validity_map_, LINE_INVALID, sizeof(validity_map_)); }
+
+ char* ValidityByte(int offset) {
+ return &validity_map_[offset >> kLineShift];
+ }
+
+ char* CachedData(int offset) { return &data_[offset]; }
+
+ private:
+ char data_[kPageSize]; // The cached data.
+ static const int kValidityMapSize = kPageSize >> kLineShift;
+ char validity_map_[kValidityMapSize]; // One byte per line.
+};
+
+
+class Simulator {
+ public:
+ friend class PPCDebugger;
+ enum Register {
+ no_reg = -1,
+ r0 = 0,
+ sp,
+ r2,
+ r3,
+ r4,
+ r5,
+ r6,
+ r7,
+ r8,
+ r9,
+ r10,
+ r11,
+ r12,
+ r13,
+ r14,
+ r15,
+ r16,
+ r17,
+ r18,
+ r19,
+ r20,
+ r21,
+ r22,
+ r23,
+ r24,
+ r25,
+ r26,
+ r27,
+ r28,
+ r29,
+ r30,
+ fp,
+ kNumGPRs = 32,
+ d0 = 0,
+ d1,
+ d2,
+ d3,
+ d4,
+ d5,
+ d6,
+ d7,
+ d8,
+ d9,
+ d10,
+ d11,
+ d12,
+ d13,
+ d14,
+ d15,
+ d16,
+ d17,
+ d18,
+ d19,
+ d20,
+ d21,
+ d22,
+ d23,
+ d24,
+ d25,
+ d26,
+ d27,
+ d28,
+ d29,
+ d30,
+ d31,
+ kNumFPRs = 32
+ };
+
+ explicit Simulator(Isolate* isolate);
+ ~Simulator();
+
+ // The currently executing Simulator instance. Potentially there can be one
+ // for each native thread.
+ static Simulator* current(v8::internal::Isolate* isolate);
+
+ // Accessors for register state.
+ void set_register(int reg, intptr_t value);
+ intptr_t get_register(int reg) const;
+ double get_double_from_register_pair(int reg);
+ void set_d_register_from_double(int dreg, const double dbl) {
+ DCHECK(dreg >= 0 && dreg < kNumFPRs);
+ fp_registers_[dreg] = dbl;
+ }
+ double get_double_from_d_register(int dreg) { return fp_registers_[dreg]; }
+
+ // Special case of set_register and get_register to access the raw PC value.
+ void set_pc(intptr_t value);
+ intptr_t get_pc() const;
+
+ Address get_sp() {
+ return reinterpret_cast<Address>(static_cast<intptr_t>(get_register(sp)));
+ }
+
+ // Accessor to the internal simulator stack area.
+ uintptr_t StackLimit() const;
+
+ // Executes PPC instructions until the PC reaches end_sim_pc.
+ void Execute();
+
+ // Call on program start.
+ static void Initialize(Isolate* isolate);
+
+ // V8 generally calls into generated JS code with 5 parameters and into
+ // generated RegExp code with 7 parameters. This is a convenience function,
+ // which sets up the simulator state and grabs the result on return.
+ intptr_t Call(byte* entry, int argument_count, ...);
+ // Alternative: call a 2-argument double function.
+ void CallFP(byte* entry, double d0, double d1);
+ int32_t CallFPReturnsInt(byte* entry, double d0, double d1);
+ double CallFPReturnsDouble(byte* entry, double d0, double d1);
+
+ // Push an address onto the JS stack.
+ uintptr_t PushAddress(uintptr_t address);
+
+ // Pop an address from the JS stack.
+ uintptr_t PopAddress();
+
+ // Debugger input.
+ void set_last_debugger_input(char* input);
+ char* last_debugger_input() { return last_debugger_input_; }
+
+ // ICache checking.
+ static void FlushICache(v8::internal::HashMap* i_cache, void* start,
+ size_t size);
+
+ // Returns true if pc register contains one of the 'special_values' defined
+ // below (bad_lr, end_sim_pc).
+ bool has_bad_pc() const;
+
+ private:
+ enum special_values {
+ // Known bad pc value to ensure that the simulator does not execute
+ // without being properly setup.
+ bad_lr = -1,
+ // A pc value used to signal the simulator to stop execution. Generally
+ // the lr is set to this value on transition from native C code to
+ // simulated execution, so that the simulator can "return" to the native
+ // C code.
+ end_sim_pc = -2
+ };
+
+ // Unsupported instructions use Format to print an error and stop execution.
+ void Format(Instruction* instr, const char* format);
+
+ // Helper functions to set the conditional flags in the architecture state.
+ bool CarryFrom(int32_t left, int32_t right, int32_t carry = 0);
+ bool BorrowFrom(int32_t left, int32_t right);
+ bool OverflowFrom(int32_t alu_out, int32_t left, int32_t right,
+ bool addition);
+
+ // Helper functions to decode common "addressing" modes
+ int32_t GetShiftRm(Instruction* instr, bool* carry_out);
+ int32_t GetImm(Instruction* instr, bool* carry_out);
+ void ProcessPUW(Instruction* instr, int num_regs, int operand_size,
+ intptr_t* start_address, intptr_t* end_address);
+ void HandleRList(Instruction* instr, bool load);
+ void HandleVList(Instruction* inst);
+ void SoftwareInterrupt(Instruction* instr);
+
+ // Stop helper functions.
+ inline bool isStopInstruction(Instruction* instr);
+ inline bool isWatchedStop(uint32_t bkpt_code);
+ inline bool isEnabledStop(uint32_t bkpt_code);
+ inline void EnableStop(uint32_t bkpt_code);
+ inline void DisableStop(uint32_t bkpt_code);
+ inline void IncreaseStopCounter(uint32_t bkpt_code);
+ void PrintStopInfo(uint32_t code);
+
+ // Read and write memory.
+ inline uint8_t ReadBU(intptr_t addr);
+ inline int8_t ReadB(intptr_t addr);
+ inline void WriteB(intptr_t addr, uint8_t value);
+ inline void WriteB(intptr_t addr, int8_t value);
+
+ inline uint16_t ReadHU(intptr_t addr, Instruction* instr);
+ inline int16_t ReadH(intptr_t addr, Instruction* instr);
+ // Note: Overloaded on the sign of the value.
+ inline void WriteH(intptr_t addr, uint16_t value, Instruction* instr);
+ inline void WriteH(intptr_t addr, int16_t value, Instruction* instr);
+
+ inline uint32_t ReadWU(intptr_t addr, Instruction* instr);
+ inline int32_t ReadW(intptr_t addr, Instruction* instr);
+ inline void WriteW(intptr_t addr, uint32_t value, Instruction* instr);
+ inline void WriteW(intptr_t addr, int32_t value, Instruction* instr);
+
+ intptr_t* ReadDW(intptr_t addr);
+ void WriteDW(intptr_t addr, int64_t value);
+
+ void Trace(Instruction* instr);
+ void SetCR0(intptr_t result, bool setSO = false);
+ void ExecuteBranchConditional(Instruction* instr);
+ void ExecuteExt1(Instruction* instr);
+ bool ExecuteExt2_10bit(Instruction* instr);
+ bool ExecuteExt2_9bit_part1(Instruction* instr);
+ void ExecuteExt2_9bit_part2(Instruction* instr);
+ void ExecuteExt2(Instruction* instr);
+ void ExecuteExt4(Instruction* instr);
+#if V8_TARGET_ARCH_PPC64
+ void ExecuteExt5(Instruction* instr);
+#endif
+ void ExecuteGeneric(Instruction* instr);
+
+ // Executes one instruction.
+ void ExecuteInstruction(Instruction* instr);
+
+ // ICache.
+ static void CheckICache(v8::internal::HashMap* i_cache, Instruction* instr);
+ static void FlushOnePage(v8::internal::HashMap* i_cache, intptr_t start,
+ int size);
+ static CachePage* GetCachePage(v8::internal::HashMap* i_cache, void* page);
+
+ // Runtime call support.
+ static void* RedirectExternalReference(
+ void* external_function, v8::internal::ExternalReference::Type type);
+
+ // Handle arguments and return value for runtime FP functions.
+ void GetFpArgs(double* x, double* y, intptr_t* z);
+ void SetFpResult(const double& result);
+ void TrashCallerSaveRegisters();
+
+ void CallInternal(byte* entry);
+
+ // Architecture state.
+ // Saturating instructions require a Q flag to indicate saturation.
+ // There is currently no way to read the CPSR directly, and thus read the Q
+ // flag, so this is left unimplemented.
+ intptr_t registers_[kNumGPRs];
+ int32_t condition_reg_;
+ int32_t fp_condition_reg_;
+ intptr_t special_reg_lr_;
+ intptr_t special_reg_pc_;
+ intptr_t special_reg_ctr_;
+ int32_t special_reg_xer_;
+
+ double fp_registers_[kNumFPRs];
+
+ // Simulator support.
+ char* stack_;
+ bool pc_modified_;
+ int icount_;
+
+ // Debugger input.
+ char* last_debugger_input_;
+
+ // Icache simulation
+ v8::internal::HashMap* i_cache_;
+
+ // Registered breakpoints.
+ Instruction* break_pc_;
+ Instr break_instr_;
+
+ v8::internal::Isolate* isolate_;
+
+ // A stop is watched if its code is less than kNumOfWatchedStops.
+ // Only watched stops support enabling/disabling and the counter feature.
+ static const uint32_t kNumOfWatchedStops = 256;
+
+ // Breakpoint is disabled if bit 31 is set.
+ static const uint32_t kStopDisabledBit = 1 << 31;
+
+ // A stop is enabled, meaning the simulator will stop when meeting the
+ // instruction, if bit 31 of watched_stops_[code].count is unset.
+ // The value watched_stops_[code].count & ~(1 << 31) indicates how many times
+ // the breakpoint was hit or gone through.
+ struct StopCountAndDesc {
+ uint32_t count;
+ char* desc;
+ };
+ StopCountAndDesc watched_stops_[kNumOfWatchedStops];
+};
+
+
+// When running with the simulator transition into simulated execution at this
+// point.
+#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
+ reinterpret_cast<Object*>(Simulator::current(Isolate::Current())->Call( \
+ FUNCTION_ADDR(entry), 5, (intptr_t)p0, (intptr_t)p1, (intptr_t)p2, \
+ (intptr_t)p3, (intptr_t)p4))
+
+#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7, p8) \
+ Simulator::current(Isolate::Current()) \
+ ->Call(entry, 10, (intptr_t)p0, (intptr_t)p1, (intptr_t)p2, \
+ (intptr_t)p3, (intptr_t)p4, (intptr_t)p5, (intptr_t)p6, \
+ (intptr_t)p7, (intptr_t)NULL, (intptr_t)p8)
+
+
+// The simulator has its own stack. Thus it has a different stack limit from
+// the C-based native code. Setting the c_limit to indicate a very small
+// stack cause stack overflow errors, since the simulator ignores the input.
+// This is unlikely to be an issue in practice, though it might cause testing
+// trouble down the line.
+class SimulatorStack : public v8::internal::AllStatic {
+ public:
+ static inline uintptr_t JsLimitFromCLimit(v8::internal::Isolate* isolate,
+ uintptr_t c_limit) {
+ return Simulator::current(isolate)->StackLimit();
+ }
+
+ static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
+ Simulator* sim = Simulator::current(Isolate::Current());
+ return sim->PushAddress(try_catch_address);
+ }
+
+ static inline void UnregisterCTryCatch() {
+ Simulator::current(Isolate::Current())->PopAddress();
+ }
+};
+}
+} // namespace v8::internal
+
+#endif // !defined(USE_SIMULATOR)
+#endif // V8_PPC_SIMULATOR_PPC_H_