Initial SIMDBC interpreter.

runtime/vm/disassembler_dbc.cc

+// Copyright (c) 2016, the Dart 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 file.
+
+#include "vm/disassembler.h"
+
+#include "vm/globals.h"  // Needed here to get TARGET_ARCH_DBC.
+#if defined(TARGET_ARCH_DBC)
+
+#include "platform/assert.h"
+#include "vm/cpu.h"
+
+namespace dart {
+
+static const char* kOpcodeNames[] = {
+#define BYTECODE_NAME(name, encoding, op1, op2, op3) #name,
+    BYTECODES_LIST(BYTECODE_NAME)
+#undef BYTECODE_NAME
+};
+
+static const size_t kOpcodeCount =
+    sizeof(kOpcodeNames) / sizeof(kOpcodeNames[0]);
+
+typedef void (*BytecodeFormatter)(char* buffer, intptr_t size, uword pc,
+                                  uint32_t bc);
+typedef void (*Fmt)(char** buf, intptr_t* size, uword pc, int32_t value);
+
+
+template<typename ValueType>
+void FormatOperand(char** buf,
+                   intptr_t* size,
+                   const char* fmt,
+                   ValueType value) {
+  intptr_t written = OS::SNPrint(*buf, *size, fmt, value);
+  if (written < *size) {
+    *buf += written;
+    *size += written;
+  } else {
+    *size = -1;
+  }
+}
+
+
+
+static void Fmt___(char** buf, intptr_t* size, uword pc, int32_t value) {}
+
+
+static void Fmttgt(char** buf, intptr_t* size, uword pc, int32_t value) {
+  FormatOperand(buf, size, "-> %" Px, pc + (value << 2));
+}
+
+
+static void Fmtlit(char** buf, intptr_t* size, uword pc, int32_t value) {
+  FormatOperand(buf, size, "k%d", value);
+}
+
+
+static void Fmtreg(char** buf, intptr_t* size, uword pc, int32_t value) {
+  FormatOperand(buf, size, "r%d", value);
+}
+
+
+static void Fmtxeg(char** buf, intptr_t* size, uword pc, int32_t value) {
+  FormatOperand(buf, size, "R(%d)", value);
+}
+
+
+static void Fmtnum(char** buf, intptr_t* size, uword pc, int32_t value) {
+  FormatOperand(buf, size, "#%d", value);
+}
+
+
+static void Apply(char** buf, intptr_t* size, uword pc, Fmt fmt, int32_t value,
+                  const char* suffix) {

[Florian Schneider, 2016/04/12 02:29:59]

Formatting: I think we tend to do either all in one line, or one argument per
line, if they don't fit on one line.

[Vyacheslav Egorov (Google), 2016/04/12 09:01:21]

Done.

+  if (*size <= 0) {
+    return;
+  }
+
+  fmt(buf, size, pc, value);
+  if (*size > 0) {
+    FormatOperand(buf, size, "%s", suffix);
+  }
+}
+
+
+static void Format0(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                    Fmt op2, Fmt op3) {}
+
+
+static void FormatT(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                    Fmt op2, Fmt op3) {
+  const int32_t x = static_cast<int32_t>(op) >> 8;
+  Apply(&buf, &size, pc, op1, x, "");
+}
+
+
+static void FormatA(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                    Fmt op2, Fmt op3) {
+  const int32_t a = (op & 0xFF00) >> 8;
+  Apply(&buf, &size, pc, op1, a, "");
+}
+
+
+static void FormatA_D(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                      Fmt op2, Fmt op3) {
+  const int32_t a = (op & 0xFF00) >> 8;
+  const int32_t bc = op >> 16;
+  Apply(&buf, &size, pc, op1, a, ", ");
+  Apply(&buf, &size, pc, op2, bc, "");
+}
+
+
+static void FormatA_X(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                      Fmt op2, Fmt op3) {
+  const int32_t a = (op & 0xFF00) >> 8;
+  const int32_t bc = static_cast<int32_t>(op) >> 16;
+  Apply(&buf, &size, pc, op1, a, ", ");
+  Apply(&buf, &size, pc, op2, bc, "");
+}
+
+
+static void FormatX(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                    Fmt op2, Fmt op3) {
+  const int32_t bc = static_cast<int32_t>(op) >> 16;
+  Apply(&buf, &size, pc, op1, bc, "");
+}
+
+
+static void FormatD(char* buf, intptr_t size, uword pc, uint32_t op, Fmt op1,
+                    Fmt op2, Fmt op3) {
+  const int32_t bc = op >> 16;
+  Apply(&buf, &size, pc, op1, bc, "");
+}
+
+
+static void FormatA_B_C(char* buf, intptr_t size, uword pc, uint32_t op,
+                        Fmt op1, Fmt op2, Fmt op3) {
+  const int32_t a = (op >> 8) & 0xFF;
+  const int32_t b = (op >> 16) & 0xFF;
+  const int32_t c = (op >> 24) & 0xFF;
+  Apply(&buf, &size, pc, op1, a, ", ");
+  Apply(&buf, &size, pc, op2, b, ", ");
+  Apply(&buf, &size, pc, op3, c, "");
+}
+
+
+#define BYTECODE_FORMATTER(name, encoding, op1, op2, op3)                     \
+  static void Format##name(char* buf, intptr_t size, uword pc, uint32_t op) { \
+    Format##encoding(buf, size, pc, op, Fmt##op1, Fmt##op2, Fmt##op3);        \
+  }
+BYTECODES_LIST(BYTECODE_FORMATTER)
+#undef BYTECODE_FORMATTER
+
+
+static BytecodeFormatter kFormatters[] = {

[Florian Schneider, 2016/04/12 02:29:59]

Add const?

[Vyacheslav Egorov (Google), 2016/04/12 09:01:21]

Done.

+#define BYTECODE_FORMATTER(name, encoding, op1, op2, op3) &Format##name,
+    BYTECODES_LIST(BYTECODE_FORMATTER)
+#undef BYTECODE_FORMATTER
+};
+
+
+void Disassembler::DecodeInstruction(char* hex_buffer, intptr_t hex_size,
+                                     char* human_buffer, intptr_t human_size,
+                                     int* out_instr_size, uword pc) {
+  const uint32_t instr = *reinterpret_cast<uint32_t*>(pc);
+  const uint8_t opcode = instr & 0xFF;
+  ASSERT(opcode < kOpcodeCount);
+  size_t name_size =
+      OS::SNPrint(human_buffer, human_size, "%-10s\t", kOpcodeNames[opcode]);
+
+  human_buffer += name_size;
+  human_size -= name_size;
+  kFormatters[opcode](human_buffer, human_size, pc, instr);
+
+  OS::SNPrint(hex_buffer, hex_size, "%08x", instr);
+  if (out_instr_size) {
+    *out_instr_size = sizeof(uint32_t);
+  }
+}
+
+
+}  // namespace dart
+
+#endif  // defined TARGET_ARCH_DBC