Merge experimental/a64 to bleeding_edge.

test/cctest/test-utils-a64.h

+// Copyright 2013 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.
+
+#ifndef V8_A64_TEST_UTILS_A64_H_
+#define V8_A64_TEST_UTILS_A64_H_
+
+#include "v8.h"
+
+#include "macro-assembler.h"
+#include "a64/macro-assembler-a64.h"
+#include "a64/utils-a64.h"
+#include "cctest.h"
+
+
+using namespace v8::internal;
+
+
+// RegisterDump: Object allowing integer, floating point and flags registers
+// to be saved to itself for future reference.
+class RegisterDump {
+ public:
+  RegisterDump() : completed_(false) {}
+
+  // The Dump method generates code to store a snapshot of the register values.
+  // It needs to be able to use the stack temporarily, and requires that the
+  // current stack pointer is csp, and is properly aligned.
+  //
+  // The dumping code is generated though the given MacroAssembler. No registers
+  // are corrupted in the process, but the stack is used briefly. The flags will
+  // be corrupted during this call.
+  void Dump(MacroAssembler* assm);
+
+  // Register accessors.
+  inline int32_t wreg(unsigned code) const {
+    if (code == kSPRegInternalCode) {
+      return wspreg();
+    }
+    ASSERT(RegAliasesMatch(code));
+    return dump_.w_[code];
+  }
+
+  inline int64_t xreg(unsigned code) const {
+    if (code == kSPRegInternalCode) {
+      return spreg();
+    }
+    ASSERT(RegAliasesMatch(code));
+    return dump_.x_[code];
+  }
+
+  // FPRegister accessors.
+  inline uint32_t sreg_bits(unsigned code) const {
+    ASSERT(FPRegAliasesMatch(code));
+    return dump_.s_[code];
+  }
+
+  inline float sreg(unsigned code) const {
+    return rawbits_to_float(sreg_bits(code));
+  }
+
+  inline uint64_t dreg_bits(unsigned code) const {
+    ASSERT(FPRegAliasesMatch(code));
+    return dump_.d_[code];
+  }
+
+  inline double dreg(unsigned code) const {
+    return rawbits_to_double(dreg_bits(code));
+  }
+
+  // Stack pointer accessors.
+  inline int64_t spreg() const {
+    ASSERT(SPRegAliasesMatch());
+    return dump_.sp_;
+  }
+
+  inline int64_t wspreg() const {
+    ASSERT(SPRegAliasesMatch());
+    return dump_.wsp_;
+  }
+
+  // Flags accessors.
+  inline uint64_t flags_nzcv() const {
+    ASSERT(IsComplete());
+    ASSERT((dump_.flags_ & ~Flags_mask) == 0);
+    return dump_.flags_ & Flags_mask;
+  }
+
+  inline bool IsComplete() const {
+    return completed_;
+  }
+
+ private:
+  // Indicate whether the dump operation has been completed.
+  bool completed_;
+
+  // Check that the lower 32 bits of x<code> exactly match the 32 bits of
+  // w<code>. A failure of this test most likely represents a failure in the
+  // ::Dump method, or a failure in the simulator.
+  bool RegAliasesMatch(unsigned code) const {
+    ASSERT(IsComplete());
+    ASSERT(code < kNumberOfRegisters);
+    return ((dump_.x_[code] & kWRegMask) == dump_.w_[code]);
+  }
+
+  // As RegAliasesMatch, but for the stack pointer.
+  bool SPRegAliasesMatch() const {
+    ASSERT(IsComplete());
+    return ((dump_.sp_ & kWRegMask) == dump_.wsp_);
+  }
+
+  // As RegAliasesMatch, but for floating-point registers.
+  bool FPRegAliasesMatch(unsigned code) const {
+    ASSERT(IsComplete());
+    ASSERT(code < kNumberOfFPRegisters);
+    return (dump_.d_[code] & kSRegMask) == dump_.s_[code];
+  }
+
+  // Store all the dumped elements in a simple struct so the implementation can
+  // use offsetof to quickly find the correct field.
+  struct dump_t {
+    // Core registers.
+    uint64_t x_[kNumberOfRegisters];
+    uint32_t w_[kNumberOfRegisters];
+
+    // Floating-point registers, as raw bits.
+    uint64_t d_[kNumberOfFPRegisters];
+    uint32_t s_[kNumberOfFPRegisters];
+
+    // The stack pointer.
+    uint64_t sp_;
+    uint64_t wsp_;
+
+    // NZCV flags, stored in bits 28 to 31.
+    // bit[31] : Negative
+    // bit[30] : Zero
+    // bit[29] : Carry
+    // bit[28] : oVerflow
+    uint64_t flags_;
+  } dump_;
+
+  STATIC_ASSERT(sizeof(dump_.d_[0]) == kDRegSizeInBytes);
+  STATIC_ASSERT(sizeof(dump_.s_[0]) == kSRegSizeInBytes);
+  STATIC_ASSERT(sizeof(dump_.d_[0]) == kXRegSizeInBytes);
+  STATIC_ASSERT(sizeof(dump_.s_[0]) == kWRegSizeInBytes);
+  STATIC_ASSERT(sizeof(dump_.x_[0]) == kXRegSizeInBytes);
+  STATIC_ASSERT(sizeof(dump_.w_[0]) == kWRegSizeInBytes);
+};
+
+// Some of these methods don't use the RegisterDump argument, but they have to
+// accept them so that they can overload those that take register arguments.
+bool Equal32(uint32_t expected, const RegisterDump*, uint32_t result);
+bool Equal64(uint64_t expected, const RegisterDump*, uint64_t result);
+
+bool EqualFP32(float expected, const RegisterDump*, float result);
+bool EqualFP64(double expected, const RegisterDump*, double result);
+
+bool Equal32(uint32_t expected, const RegisterDump* core, const Register& reg);
+bool Equal64(uint64_t expected, const RegisterDump* core, const Register& reg);
+
+bool EqualFP32(float expected, const RegisterDump* core,
+               const FPRegister& fpreg);
+bool EqualFP64(double expected, const RegisterDump* core,
+               const FPRegister& fpreg);
+
+bool Equal64(const Register& reg0, const RegisterDump* core,
+             const Register& reg1);
+
+bool EqualNzcv(uint32_t expected, uint32_t result);
+
+bool EqualRegisters(const RegisterDump* a, const RegisterDump* b);
+
+// Populate the w, x and r arrays with registers from the 'allowed' mask. The
+// r array will be populated with <reg_size>-sized registers,
+//
+// This allows for tests which use large, parameterized blocks of registers
+// (such as the push and pop tests), but where certain registers must be
+// avoided as they are used for other purposes.
+//
+// Any of w, x, or r can be NULL if they are not required.
+//
+// The return value is a RegList indicating which registers were allocated.
+RegList PopulateRegisterArray(Register* w, Register* x, Register* r,
+                              int reg_size, int reg_count, RegList allowed);
+
+// As PopulateRegisterArray, but for floating-point registers.
+RegList PopulateFPRegisterArray(FPRegister* s, FPRegister* d, FPRegister* v,
+                                int reg_size, int reg_count, RegList allowed);
+
+// Ovewrite the contents of the specified registers. This enables tests to
+// check that register contents are written in cases where it's likely that the
+// correct outcome could already be stored in the register.
+//
+// This always overwrites X-sized registers. If tests are operating on W
+// registers, a subsequent write into an aliased W register should clear the
+// top word anyway, so clobbering the full X registers should make tests more
+// rigorous.
+void Clobber(MacroAssembler* masm, RegList reg_list,
+             uint64_t const value = 0xfedcba9876543210UL);
+
+// As Clobber, but for FP registers.
+void ClobberFP(MacroAssembler* masm, RegList reg_list,
+               double const value = kFP64SignallingNaN);
+
+// As Clobber, but for a CPURegList with either FP or integer registers. When
+// using this method, the clobber value is always the default for the basic
+// Clobber or ClobberFP functions.
+void Clobber(MacroAssembler* masm, CPURegList reg_list);
+
+#endif  // V8_A64_TEST_UTILS_A64_H_