Set TARGET_OS_* from GN, falling back to HOST_OS_*.

runtime/vm/constants_arm.h

 // Copyright (c) 2013, 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.
 
 #ifndef RUNTIME_VM_CONSTANTS_ARM_H_
 #define RUNTIME_VM_CONSTANTS_ARM_H_
 
 #include "platform/globals.h"
 #include "platform/assert.h"
 
@@ skipping 63 matching lines @@
   R10 = 10,  // THR
   R11 = 11,  // Linux FP
   R12 = 12,  // IP aka TMP
   R13 = 13,  // SP
   R14 = 14,  // LR
   R15 = 15,  // PC
   kNumberOfCpuRegisters = 16,
   kNoRegister = -1,  // Signals an illegal register.
 
 // Aliases.
-#if defined(TARGET_ABI_IOS)
+#if defined(TARGET_OS_MACOS) || TARGET_OS_IOS
   FP = R7,
   NOTFP = R11,
-#elif defined(TARGET_ABI_EABI)
+#else
   FP = R11,
   NOTFP = R7,
-#else
-#error Unknown ABI
 #endif
   IP = R12,
   SP = R13,
   LR = R14,
   PC = R15,
 };
 
 
 // Values for single-precision floating point registers.
 enum SRegister {
@@ skipping 196 matching lines @@
 
 
 // List of registers used in load/store multiple.
 typedef uint16_t RegList;
 const RegList kAllCpuRegistersList = 0xFFFF;
 
 
 // C++ ABI call registers.
 const RegList kAbiArgumentCpuRegs =
     (1 << R0) | (1 << R1) | (1 << R2) | (1 << R3);
-#if defined(TARGET_ABI_IOS)
+#if defined(TARGET_OS_MACOS) || TARGET_OS_IOS
 const RegList kAbiPreservedCpuRegs =
     (1 << R4) | (1 << R5) | (1 << R6) | (1 << R8) | (1 << R10) | (1 << R11);
 const int kAbiPreservedCpuRegCount = 6;
-#elif defined(TARGET_ABI_EABI)
+#else
 const RegList kAbiPreservedCpuRegs = (1 << R4) | (1 << R5) | (1 << R6) |
                                      (1 << R7) | (1 << R8) | (1 << R9) |
                                      (1 << R10);
 const int kAbiPreservedCpuRegCount = 7;
-#else
-#error Unknown ABI
 #endif
 const QRegister kAbiFirstPreservedFpuReg = Q4;
 const QRegister kAbiLastPreservedFpuReg = Q7;
 const int kAbiPreservedFpuRegCount = 4;
 
 const RegList kReservedCpuRegisters = (1 << SPREG) | (1 << FPREG) | (1 << TMP) |
                                       (1 << PP) | (1 << THR) | (1 << PC);
 // CPU registers available to Dart allocator.
 const RegList kDartAvailableCpuRegs =
     kAllCpuRegistersList & ~kReservedCpuRegisters;
 // Registers available to Dart that are not preserved by runtime calls.
 const RegList kDartVolatileCpuRegs =
     kDartAvailableCpuRegs & ~kAbiPreservedCpuRegs;
-#if defined(TARGET_ABI_IOS)
+#if defined(TARGET_OS_MACOS) || TARGET_OS_IOS
 const int kDartVolatileCpuRegCount = 6;
-#elif defined(TARGET_ABI_EABI)
+#else
 const int kDartVolatileCpuRegCount = 5;
 #endif
 const QRegister kDartFirstVolatileFpuReg = Q0;
 const QRegister kDartLastVolatileFpuReg = Q3;
 const int kDartVolatileFpuRegCount = 4;
 
 
 // Values for the condition field as defined in section A3.2.
 enum Condition {
   kNoCondition = -1,
@@ skipping 416 matching lines @@
   static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_CONSTANTS_ARM_H_