[mips] Initial framework support for MIPS32

src/vm/assembler_mips.h

Index: src/vm/assembler_mips.h
diff --git a/src/vm/assembler_mips.h b/src/vm/assembler_mips.h
new file mode 100644
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--- /dev/null
+++ b/src/vm/assembler_mips.h
@@ -0,0 +1,255 @@
+// Copyright (c) 2016, the Dartino project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE.md file.
+
+#ifndef SRC_VM_ASSEMBLER_MIPS_H_
+#define SRC_VM_ASSEMBLER_MIPS_H_
+
+#ifndef SRC_VM_ASSEMBLER_H_
+#error Do not include assembler_mips.h directly; use assembler.h instead.
+#endif
+
+#include "src/shared/assert.h"
+#include "src/shared/utils.h"
+
+namespace dartino {
+
+enum Register {
+  ZR =  0,
+  AT =  1,
+  V0 =  2,
+  V1 =  3,
+  A0 =  4,
+  A1 =  5,
+  A2 =  6,
+  A3 =  7,
+  T0 =  8,
+  T1 =  9,
+  T2 = 10,
+  T3 = 11,
+  T4 = 12,
+  T5 = 13,
+  T6 = 14,
+  T7 = 15,
+  S0 = 16,
+  S1 = 17,
+  S2 = 18,
+  S3 = 19,
+  S4 = 20,
+  S5 = 21,
+  S6 = 22,
+  S7 = 23,
+  T8 = 24,
+  T9 = 25,
+  K0 = 26,  //  mips kernel reserved register. DO NOT USE.
+  K1 = 27,  //  mips kernel reserved register. DO NOT USE.
+  GP = 28,
+  SP = 29,
+  FP = 30,
+  RA = 31,
+};
+
+enum ScaleFactor {
+  TIMES_1 = 0,
+  TIMES_2 = 1,
+  TIMES_4 = 2,
+  TIMES_WORD_SIZE = TIMES_4,
+  TIMES_8 = 3
+};
+enum ShiftType { SLL, SRL, SLLV, SRLV, SRA, SRAV };
+
+enum Condition {
+  F    =  0,    // False
+  T    =  1,    // True
+  UN   =  2,    // Unordered
+  OR   =  3,    // Ordered
+  EQ   =  4,    // Equal
+  NEQ  =  5,    // Not Equal
+  UEQ  =  6,    // Unordered or Equal
+  OLG  =  7,    // Ordered or Less than or Greater Than
+  OLT  =  8,    // Ordered Less Than
+  UGE  =  9,    // Unordered or Greater Than or Equal
+  ULT  = 10,    // Unordered or Less Than
+  OGE  = 11,    // Ordered Greater Than or Equal
+  OLE  = 12,    // Ordered Less Than or Equal
+  UGT  = 13,    // Unordered or Greater Than
+  ULE  = 14,    // Unordered or Less Than or Equal
+  OGT  = 15,    // Ordered Greater Than
+  SF   = 16,    // Signaling False
+  ST   = 17,    // Signaling True
+  NGLE = 18,    // Not Greater Than or Less Than or Equal
+  GLE  = 19,    // Greater Than, or Less Than or Equal
+  SEQ  = 20,    // Signaling Equal
+  SNE  = 21,    // Signaling Not Equal
+  NGL  = 22,    // Not Greater Than or Less Than
+  GL   = 23,    // Greater Than or Less Than
+  LT   = 24,    // Less Than
+  NLT  = 25,    // Not Less Than
+  NGE  = 26,    // Not Greater Than
+  GE   = 27,    // Greater Than or Equal
+  LE   = 28,    // Less Than or Equal
+  NLE  = 29,    // Not Less Than or Equal
+  NGT  = 30,    // Not Greater Than
+  GT   = 31,    // Greater Than
+};
+
+class Immediate {
+ public:
+  explicit Immediate(int32_t value) : value_(value) {}
+  int32_t value() const { return value_; }
+
+ private:
+  const int32_t value_;
+};
+
+class Address {
+ public:
+  Address(Register base, int32_t offset)
+      : base_(base), offset_(offset) {}
+
+  Register base() const { return base_; }
+  int32_t offset() const { return offset_; }
+
+ private:
+  const Register base_;
+  const int32_t offset_;
+};
+
+
+class Label {
+ public:
+  Label() : position_(-1) {}
+
+  // Returns the position for a label. Positions are assigned on first use.
+  int position() {
+    if (position_ == -1) position_ = position_counter_++;
+    return position_;
+  }
+
+ private:
+  int position_;
+  static int position_counter_;
+};
+
+#define INSTRUCTION_0(name, format) \
+  void name() { Print(format); }
+
+#define INSTRUCTION_1(name, format, t0) \
+  void name(t0 a0) { Print(format, Wrap(a0)); }
+
+#define INSTRUCTION_2(name, format, t0, t1) \
+  void name(t0 a0, t1 a1) { Print(format, Wrap(a0), Wrap(a1)); }
+
+#define INSTRUCTION_3(name, format, t0, t1, t2)  \
+  void name(t0 a0, t1 a1, t2 a2) {               \
+    Print(format, Wrap(a0), Wrap(a1), Wrap(a2)); \
+  }
+
+#define INSTRUCTION_4(name, format, t0, t1, t2, t3)        \
+  void name(t0 a0, t1 a1, t2 a2, t3 a3) {                  \
+    Print(format, Wrap(a0), Wrap(a1), Wrap(a2), Wrap(a3)); \
+  }
+
+class Assembler {
+ public:
+  INSTRUCTION_3(add, "add %r, %r, %r", Register, Register, Register);
+  INSTRUCTION_3(addi, "addi %r, %r, %i", Register, Register, const Immediate&);
+  INSTRUCTION_3(addu, "addu %r, %r, %r", Register, Register, Register);
+  INSTRUCTION_3(addiu, "addiu %r, %r, %i", Register, Register,
+                const Immediate&);
+
+  INSTRUCTION_3(andi, "andi %r, %r, %i", Register, Register, const Immediate&);
+  INSTRUCTION_3(and_, "and %r, %r, %r", Register, Register, Register);
+
+  INSTRUCTION_0(break_, "break");
+
+  INSTRUCTION_1(b, "b %s", const char*);
+  INSTRUCTION_1(b, "b %l", Label*);
+  INSTRUCTION_2(b, "b%c %l", Condition, Label*);
+  INSTRUCTION_4(b, "b%c %r, %r, %l", Condition, Register, Register, Label*);
+  INSTRUCTION_4(b, "b%c %r, %r, %s", Condition, Register, Register,
+                const char*);
+
+  INSTRUCTION_1(jal, "jal %s", const char*);
+  INSTRUCTION_1(jalr, "jalr %r", Register);
+  INSTRUCTION_1(jr, "jr %r", Register);
+
+  INSTRUCTION_2(la, "la %r, %s", Register, const char*);
+  INSTRUCTION_2(la, "la %r, %l", Register, Label*);
+  INSTRUCTION_2(li, "li %r, %i", Register, const Immediate&);
+  INSTRUCTION_2(lui, "lui %r, %i", Register, const Immediate&);
+
+  INSTRUCTION_2(lb, "lb %r, %a", Register, const Address&);
+  INSTRUCTION_2(lbu, "lbu %r, %a", Register, const Address&);
+  INSTRUCTION_2(lw, "lw %r, %a", Register, const Address&);
+  INSTRUCTION_2(lw, "lw %r, %s", Register, const char*);
+
+  INSTRUCTION_2(move, "move %r, %r", Register, Register);
+  INSTRUCTION_2(mult, "mult %r, %r", Register, Register);
+
+  INSTRUCTION_1(mfhi, "mfhi %r", Register);
+  INSTRUCTION_1(mflo, "mflo %r", Register);
+
+  INSTRUCTION_0(nop, "nop");
+  INSTRUCTION_2(not_, "nor %r, %r, $0", Register, Register);
+
+  INSTRUCTION_3(or_, "or %r, %r, %r", Register, Register, Register);
+
+  INSTRUCTION_3(sll, "sll %r, %r, %i", Register, Register, const Immediate&);
+  INSTRUCTION_3(sllv, "sllv %r, %r, %r", Register, Register, Register);
+  INSTRUCTION_3(sra, "sra %r, %r, %i", Register, Register, const Immediate&);
+  INSTRUCTION_3(srav, "srav %r, %r, %r", Register, Register, Register);
+  INSTRUCTION_3(srl, "srl %r, %r, %i", Register, Register, const Immediate&);
+
+  INSTRUCTION_3(slt, "slt %r, %r, %r", Register, Register, Register);
+  INSTRUCTION_3(sltu, "sltu %r, %r, %r", Register, Register, Register);
+
+
+  INSTRUCTION_3(sub, "sub %r, %r, %r", Register, Register, Register);
+  INSTRUCTION_3(subi, "addi %r, %r, -%i", Register, Register, const Immediate&);
+  INSTRUCTION_3(subu, "subu %r, %r, %r", Register, Register, Register);
+
+  INSTRUCTION_0(syscall, "syscall");
+
+  INSTRUCTION_2(sb, "sb %r, %a", Register, const Address&);
+  INSTRUCTION_2(sw, "sw %r, %a", Register, const Address&);
+
+  INSTRUCTION_3(xor_, "xor %r, %r, %r", Register, Register, Register);
+
+
+  // Align what follows to a 2^power address.
+  void AlignToPowerOfTwo(int power);
+
+  void Bind(const char* prefix, const char* name);
+  void Bind(Label* label);
+
+  void DefineLong(const char* name);
+
+  void SwitchToText();
+
+  void BindWithPowerOfTwoAlignment(const char* name, int power);
+  void SwitchToData();
+
+  const char* LabelPrefix();
+
+ private:
+  void Print(const char* format, ...);
+  void PrintAddress(const Address* address);
+
+  Condition Wrap(Condition condition) { return condition; }
+  Register Wrap(Register reg) { return reg; }
+  const char* Wrap(const char* label) { return label; }
+  Label* Wrap(Label* label) { return label; }
+  const Immediate* Wrap(const Immediate& immediate) { return &immediate; }
+  const Address* Wrap(const Address& address) { return &address; }
+};
+
+#undef INSTRUCTION_0
+#undef INSTRUCTION_1
+#undef INSTRUCTION_2
+#undef INSTRUCTION_3
+#undef INSTRUCTION_4
+
+}  // namespace dartino
+
+#endif  // SRC_VM_ASSEMBLER_MIPS_H_