// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/assembler-inl.h"
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#include "src/macro-assembler.h"
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#include "src/compiler/linkage.h"
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#include "src/zone/zone.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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namespace {
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// Platform-specific configuration for C calling convention.
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#if V8_TARGET_ARCH_IA32
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// ===========================================================================
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// == ia32 ===================================================================
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// ===========================================================================
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#define CALLEE_SAVE_REGISTERS esi.bit() | edi.bit() | ebx.bit()
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#elif V8_TARGET_ARCH_X64
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// ===========================================================================
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// == x64 ====================================================================
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// ===========================================================================
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#ifdef _WIN64
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// == x64 windows ============================================================
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#define STACK_SHADOW_WORDS 4
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#define PARAM_REGISTERS rcx, rdx, r8, r9
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#define CALLEE_SAVE_REGISTERS \
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rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() | r14.bit() | \
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r15.bit()
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#define CALLEE_SAVE_FP_REGISTERS \
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(1 << xmm6.code()) | (1 << xmm7.code()) | (1 << xmm8.code()) | \
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(1 << xmm9.code()) | (1 << xmm10.code()) | (1 << xmm11.code()) | \
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(1 << xmm12.code()) | (1 << xmm13.code()) | (1 << xmm14.code()) | \
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(1 << xmm15.code())
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#else
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// == x64 other ==============================================================
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#define PARAM_REGISTERS rdi, rsi, rdx, rcx, r8, r9
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#define CALLEE_SAVE_REGISTERS \
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rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit()
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#endif
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#elif V8_TARGET_ARCH_ARM
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// ===========================================================================
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// == arm ====================================================================
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// ===========================================================================
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#define PARAM_REGISTERS r0, r1, r2, r3
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#define CALLEE_SAVE_REGISTERS \
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r4.bit() | r5.bit() | r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit()
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#define CALLEE_SAVE_FP_REGISTERS \
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(1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) | \
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(1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
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(1 << d14.code()) | (1 << d15.code())
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#elif V8_TARGET_ARCH_ARM64
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// ===========================================================================
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// == arm64 ====================================================================
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// ===========================================================================
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#define PARAM_REGISTERS x0, x1, x2, x3, x4, x5, x6, x7
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#define CALLEE_SAVE_REGISTERS \
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(1 << x19.code()) | (1 << x20.code()) | (1 << x21.code()) | \
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(1 << x22.code()) | (1 << x23.code()) | (1 << x24.code()) | \
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(1 << x25.code()) | (1 << x26.code()) | (1 << x27.code()) | \
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(1 << x28.code()) | (1 << x29.code()) | (1 << x30.code())
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#define CALLEE_SAVE_FP_REGISTERS \
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(1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) | \
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(1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
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(1 << d14.code()) | (1 << d15.code())
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#elif V8_TARGET_ARCH_MIPS
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// ===========================================================================
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// == mips ===================================================================
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// ===========================================================================
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#define STACK_SHADOW_WORDS 4
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#define PARAM_REGISTERS a0, a1, a2, a3
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#define CALLEE_SAVE_REGISTERS \
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s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
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s7.bit()
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#define CALLEE_SAVE_FP_REGISTERS \
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f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
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#elif V8_TARGET_ARCH_MIPS64
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// ===========================================================================
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// == mips64 =================================================================
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// ===========================================================================
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#define PARAM_REGISTERS a0, a1, a2, a3, a4, a5, a6, a7
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#define CALLEE_SAVE_REGISTERS \
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s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
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s7.bit()
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#define CALLEE_SAVE_FP_REGISTERS \
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f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
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#elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64
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// ===========================================================================
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// == ppc & ppc64 ============================================================
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// ===========================================================================
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#define PARAM_REGISTERS r3, r4, r5, r6, r7, r8, r9, r10
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#define CALLEE_SAVE_REGISTERS \
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r14.bit() | r15.bit() | r16.bit() | r17.bit() | r18.bit() | r19.bit() | \
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r20.bit() | r21.bit() | r22.bit() | r23.bit() | r24.bit() | r25.bit() | \
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r26.bit() | r27.bit() | r28.bit() | r29.bit() | r30.bit()
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#define CALLEE_SAVE_FP_REGISTERS \
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d14.bit() | d15.bit() | d16.bit() | d17.bit() | d18.bit() | d19.bit() | \
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d20.bit() | d21.bit() | d22.bit() | d23.bit() | d24.bit() | d25.bit() | \
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d26.bit() | d27.bit() | d28.bit() | d29.bit() | d30.bit() | d31.bit()
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#elif V8_TARGET_ARCH_S390X
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// ===========================================================================
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// == s390x ==================================================================
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// ===========================================================================
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#define PARAM_REGISTERS r2, r3, r4, r5, r6
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#define CALLEE_SAVE_REGISTERS \
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r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit() | ip.bit() | r13.bit()
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#define CALLEE_SAVE_FP_REGISTERS \
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d8.bit() | d9.bit() | d10.bit() | d11.bit() | d12.bit() | d13.bit() | \
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d14.bit() | d15.bit()
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#elif V8_TARGET_ARCH_S390
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// ===========================================================================
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// == s390 ===================================================================
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// ===========================================================================
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#define PARAM_REGISTERS r2, r3, r4, r5, r6
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#define CALLEE_SAVE_REGISTERS \
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r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit() | ip.bit() | r13.bit()
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#define CALLEE_SAVE_FP_REGISTERS (d4.bit() | d6.bit())
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#else
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// ===========================================================================
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// == unknown ================================================================
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// ===========================================================================
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#define UNSUPPORTED_C_LINKAGE 1
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#endif
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} // namespace
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// General code uses the above configuration data.
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CallDescriptor* Linkage::GetSimplifiedCDescriptor(
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Zone* zone, const MachineSignature* msig, bool set_initialize_root_flag) {
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DCHECK_LE(msig->parameter_count(), static_cast<size_t>(kMaxCParameters));
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LocationSignature::Builder locations(zone, msig->return_count(),
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msig->parameter_count());
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// Check the types of the signature.
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// Currently no floating point parameters or returns are allowed because
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// on ia32, the FP top of stack is involved.
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for (size_t i = 0; i < msig->return_count(); i++) {
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MachineRepresentation rep = msig->GetReturn(i).representation();
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CHECK_NE(MachineRepresentation::kFloat32, rep);
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CHECK_NE(MachineRepresentation::kFloat64, rep);
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}
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for (size_t i = 0; i < msig->parameter_count(); i++) {
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MachineRepresentation rep = msig->GetParam(i).representation();
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CHECK_NE(MachineRepresentation::kFloat32, rep);
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CHECK_NE(MachineRepresentation::kFloat64, rep);
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}
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#ifdef UNSUPPORTED_C_LINKAGE
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// This method should not be called on unknown architectures.
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FATAL("requested C call descriptor on unsupported architecture");
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return nullptr;
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#endif
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// Add return location(s).
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CHECK_GE(2, locations.return_count_);
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if (locations.return_count_ > 0) {
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locations.AddReturn(LinkageLocation::ForRegister(kReturnRegister0.code(),
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msig->GetReturn(0)));
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}
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if (locations.return_count_ > 1) {
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locations.AddReturn(LinkageLocation::ForRegister(kReturnRegister1.code(),
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msig->GetReturn(1)));
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}
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const int parameter_count = static_cast<int>(msig->parameter_count());
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#ifdef PARAM_REGISTERS
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const v8::internal::Register kParamRegisters[] = {PARAM_REGISTERS};
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const int kParamRegisterCount = static_cast<int>(arraysize(kParamRegisters));
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#else
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const v8::internal::Register* kParamRegisters = nullptr;
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const int kParamRegisterCount = 0;
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#endif
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#ifdef STACK_SHADOW_WORDS
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int stack_offset = STACK_SHADOW_WORDS;
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#else
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int stack_offset = 0;
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#endif
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// Add register and/or stack parameter(s).
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for (int i = 0; i < parameter_count; i++) {
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if (i < kParamRegisterCount) {
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locations.AddParam(LinkageLocation::ForRegister(kParamRegisters[i].code(),
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msig->GetParam(i)));
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} else {
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locations.AddParam(LinkageLocation::ForCallerFrameSlot(
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-1 - stack_offset, msig->GetParam(i)));
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stack_offset++;
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}
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}
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#ifdef CALLEE_SAVE_REGISTERS
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const RegList kCalleeSaveRegisters = CALLEE_SAVE_REGISTERS;
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#else
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const RegList kCalleeSaveRegisters = 0;
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#endif
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#ifdef CALLEE_SAVE_FP_REGISTERS
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const RegList kCalleeSaveFPRegisters = CALLEE_SAVE_FP_REGISTERS;
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#else
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const RegList kCalleeSaveFPRegisters = 0;
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#endif
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// The target for C calls is always an address (i.e. machine pointer).
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MachineType target_type = MachineType::Pointer();
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LinkageLocation target_loc = LinkageLocation::ForAnyRegister(target_type);
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CallDescriptor::Flags flags = CallDescriptor::kNoFlags;
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if (set_initialize_root_flag) {
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flags |= CallDescriptor::kInitializeRootRegister;
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}
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return new (zone) CallDescriptor( // --
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CallDescriptor::kCallAddress, // kind
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target_type, // target MachineType
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target_loc, // target location
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locations.Build(), // location_sig
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0, // stack_parameter_count
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Operator::kNoThrow, // properties
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kCalleeSaveRegisters, // callee-saved registers
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kCalleeSaveFPRegisters, // callee-saved fp regs
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flags, "c-call");
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}
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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