[turbofan] Factor C call descriptor building into compiler/c-linkage.cc.

src/compiler/c-linkage.cc

Index: src/compiler/c-linkage.cc
diff --git a/src/compiler/c-linkage.cc b/src/compiler/c-linkage.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7ec497601925e5a5e3777451884c707fd7bbbc45
--- /dev/null
+++ b/src/compiler/c-linkage.cc
@@ -0,0 +1,245 @@
+// Copyright 2015 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.
+
+#include "src/assembler.h"
+#include "src/macro-assembler.h"
+
+#include "src/compiler/linkage.h"
+
+#include "src/zone.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+namespace {
+// Platform-specific configuration for C calling convention.
+LinkageLocation regloc(Register reg) {
+  return LinkageLocation(Register::ToAllocationIndex(reg));
+}
+
+
+LinkageLocation stackloc(int i) {
+  DCHECK_LT(i, 0);
+  return LinkageLocation(i);
+}
+
+
+#if V8_TARGET_ARCH_IA32
+// ===========================================================================
+// == ia32 ===================================================================
+// ===========================================================================
+#define RETURN_REGISTER_0 eax
+#define RETURN_REGISTER_1 edx
+#define CALLEE_SAVE_REGISTERS esi.bit() | edi.bit() | ebx.bit()
+
+#elif V8_TARGET_ARCH_X64
+// ===========================================================================
+// == x64 ====================================================================
+// ===========================================================================
+#define RETURN_REGISTER_0 rax
+#define RETURN_REGISTER_1 rdx
+
+#ifdef _WIN64
+// == x64 windows ============================================================
+#define STACK_SHADOW_WORDS 4
+#define PARAM_REGISTERS rcx, rdx, r8, r9
+#define CALLEE_SAVE_REGISTERS                                             \
+  rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() | r14.bit() | \
+      r15.bit()
+#define CALLEE_SAVE_FP_REGISTERS                                        \
+  (1 << xmm6.code()) | (1 << xmm7.code()) | (1 << xmm8.code()) |        \
+      (1 << xmm9.code()) | (1 << xmm10.code()) | (1 << xmm11.code()) |  \
+      (1 << xmm12.code()) | (1 << xmm13.code()) | (1 << xmm14.code()) | \
+      (1 << xmm15.code())
+#else
+// == x64 other ==============================================================
+#define PARAM_REGISTERS rdi, rsi, rdx, rcx, r8, r9
+#define CALLEE_SAVE_REGISTERS \
+  rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit()
+#endif
+
+#elif V8_TARGET_ARCH_X87
+// ===========================================================================
+// == x87 ====================================================================
+// ===========================================================================
+#define RETURN_REGISTER_0 eax
+#define RETURN_REGISTER_1 edx
+#define CALLEE_SAVE_REGISTERS esi.bit() | edi.bit() | ebx.bit()
+
+#elif V8_TARGET_ARCH_ARM
+// ===========================================================================
+// == arm ====================================================================
+// ===========================================================================
+#define PARAM_REGISTERS r0, r1, r2, r3
+#define RETURN_REGISTER_0 r0
+#define RETURN_REGISTER_1 r1
+#define CALLEE_SAVE_REGISTERS \
+  r4.bit() | r5.bit() | r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit()
+#define CALLEE_SAVE_FP_REGISTERS                                  \
+  (1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) |       \
+      (1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
+      (1 << d14.code()) | (1 << d15.code())
+
+
+#elif V8_TARGET_ARCH_ARM64
+// ===========================================================================
+// == arm64 ====================================================================
+// ===========================================================================
+#define PARAM_REGISTERS x0, x1, x2, x3, x4, x5, x6, x7
+#define RETURN_REGISTER_0 x0
+#define RETURN_REGISTER_1 x1
+#define CALLEE_SAVE_REGISTERS                                     \
+  (1 << x19.code()) | (1 << x20.code()) | (1 << x21.code()) |     \
+      (1 << x22.code()) | (1 << x23.code()) | (1 << x24.code()) | \
+      (1 << x25.code()) | (1 << x26.code()) | (1 << x27.code()) | \
+      (1 << x28.code()) | (1 << x29.code()) | (1 << x30.code())
+
+
+#define CALLEE_SAVE_FP_REGISTERS                                  \
+  (1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) |       \
+      (1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
+      (1 << d14.code()) | (1 << d15.code())
+
+#elif V8_TARGET_ARCH_MIPS
+// ===========================================================================
+// == mips ===================================================================
+// ===========================================================================
+#define PARAM_REGISTERS a0, a1, a2, a3
+#define RETURN_REGISTER_0 v0
+#define RETURN_REGISTER_1 v1
+#define CALLEE_SAVE_REGISTERS                                                  \
+  s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
+      s7.bit()
+#define CALLEE_SAVE_FP_REGISTERS \
+  f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
+
+#elif V8_TARGET_ARCH_MIPS64
+// ===========================================================================
+// == mips64 =================================================================
+// ===========================================================================
+#define PARAM_REGISTERS a0, a1, a2, a3, a4, a5, a6, a7
+#define RETURN_REGISTER_0 v0
+#define RETURN_REGISTER_1 v1
+#define CALLEE_SAVE_REGISTERS                                                  \
+  s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
+      s7.bit()
+#define CALLEE_SAVE_FP_REGISTERS \
+  f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
+
+#elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64
+// ===========================================================================
+// == ppc & ppc64 ============================================================
+// ===========================================================================
+#define PARAM_REGISTERS r3, r4, r5, r6, r7, r8, r9, r10
+#define RETURN_REGISTER_0 r3
+#define RETURN_REGISTER_1 r4
+#define CALLEE_SAVE_REGISTERS                                                 \
+  r14.bit() | r15.bit() | r16.bit() | r17.bit() | r18.bit() | r19.bit() |     \
+      r20.bit() | r21.bit() | r22.bit() | r23.bit() | r24.bit() | r25.bit() | \
+      r26.bit() | r27.bit() | r28.bit() | r29.bit() | r30.bit() | fp.bit()
+
+#else
+// ===========================================================================
+// == unknown ================================================================
+// ===========================================================================
+// Don't define anything. The below code will dynamically fail.
+#endif
+}  // namespace
+
+
+// General code uses the above configuration data.
+CallDescriptor* Linkage::GetSimplifiedCDescriptor(
+    Zone* zone, const MachineSignature* msig) {
+  LocationSignature::Builder locations(zone, msig->return_count(),
+                                       msig->parameter_count());
+#if 0  // TODO(titzer): instruction selector tests break here.
+  // Check the types of the signature.
+  // Currently no floating point parameters or returns are allowed because
+  // on x87 and ia32, the FP top of stack is involved.
+
+  for (size_t i = 0; i < msig->return_count(); i++) {
+    MachineType type = RepresentationOf(msig->GetReturn(i));
+    CHECK(type != kRepFloat32 && type != kRepFloat64);
+  }
+  for (size_t i = 0; i < msig->parameter_count(); i++) {
+    MachineType type = RepresentationOf(msig->GetParam(i));
+    CHECK(type != kRepFloat32 && type != kRepFloat64);
+  }
+#endif
+
+#ifdef RETURN_REGISTER_0
+  // Add return location(s).
+  CHECK(locations.return_count_ <= 2);
+
+  if (locations.return_count_ > 0) {
+    locations.AddReturn(regloc(RETURN_REGISTER_0));
+  }
+  if (locations.return_count_ > 1) {
+    locations.AddReturn(regloc(RETURN_REGISTER_1));
+  }
+#else
+  // This method should not be called on unknown architectures.
+  V8_Fatal(__FILE__, __LINE__,
+           "requested C call descriptor on unsupported architecture");
+  return nullptr;
+#endif
+
+  const int parameter_count = static_cast<int>(msig->parameter_count());
+
+#ifdef PARAM_REGISTERS
+  static const Register kParamRegisters[] = {PARAM_REGISTERS};
+  static const int kParamRegisterCount =
+      static_cast<int>(arraysize(kParamRegisters));
+#else
+  static const Register* kParamRegisters = nullptr;
+  static const int kParamRegisterCount = 0;
+#endif
+
+#ifdef STACK_SHADOW_WORDS
+  int stack_offset = STACK_SHADOW_WORDS;
+#else
+  int stack_offset = 0;
+#endif
+  // Add register and/or stack parameter(s).
+  for (int i = 0; i < parameter_count; i++) {
+    if (i < kParamRegisterCount) {
+      locations.AddParam(regloc(kParamRegisters[i]));
+    } else {
+      locations.AddParam(stackloc(-1 - stack_offset));
+      stack_offset++;
+    }
+  }
+
+#ifdef CALLEE_SAVE_REGISTERS
+  const RegList kCalleeSaveRegisters = CALLEE_SAVE_REGISTERS;
+#else
+  const RegList kCalleeSaveRegisters = 0;
+#endif
+
+#ifdef CALLEE_SAVE_FP_REGISTERS
+  const RegList kCalleeSaveFPRegisters = CALLEE_SAVE_FP_REGISTERS;
+#else
+  const RegList kCalleeSaveFPRegisters = 0;
+#endif
+
+  // The target for C calls is always an address (i.e. machine pointer).
+  MachineType target_type = kMachPtr;
+  LinkageLocation target_loc = LinkageLocation::AnyRegister();
+  return new (zone) CallDescriptor(  // --
+      CallDescriptor::kCallAddress,  // kind
+      target_type,                   // target MachineType
+      target_loc,                    // target location
+      msig,                          // machine_sig
+      locations.Build(),             // location_sig
+      0,                             // js_parameter_count
+      Operator::kNoProperties,       // properties
+      kCalleeSaveRegisters,          // callee-saved registers
+      kCalleeSaveFPRegisters,        // callee-saved fp regs
+      CallDescriptor::kNoFlags,      // flags
+      "c-call");
+}
+}
+}
+}