[wasm] TrapIf and TrapUnless TurboFan operators implemented on mips.

src/compiler/mips/code-generator-mips.cc

 // Copyright 2014 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/compiler/code-generator.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/osr.h"
@@ skipping 1610 matching lines @@
       return true;
     case kUnsignedGreaterThan:
       cc = ugt;
       return true;
     default:
       break;
   }
   return false;
 }
 
-
-// Assembles branches after an instruction.
-void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
-  MipsOperandConverter i(this, instr);
-  Label* tlabel = branch->true_label;
-  Label* flabel = branch->false_label;
+void AssembleBranchToLabels(CodeGenerator* gen, MacroAssembler* masm,

[titzer, 2017/01/11 09:53:32]

Is it possible to either redefine the __ macro or embed this function in a class
with the requisite masm() method so that we can keep the same notation for
assembler calls?

[ahaas, 2017/01/11 14:05:36]

Done.

+                            Instruction* instr, FlagsCondition condition,
+                            Label* tlabel, Label* flabel, bool fallthru) {
   Condition cc = kNoCondition;
   // MIPS does not have condition code flags, so compare and branch are
   // implemented differently than on the other arch's. The compare operations
   // emit mips pseudo-instructions, which are handled here by branch
   // instructions that do the actual comparison. Essential that the input
   // registers to compare pseudo-op are not modified before this branch op, as
   // they are tested here.
 
+  MipsOperandConverter i(gen, instr);
   if (instr->arch_opcode() == kMipsTst) {
-    cc = FlagsConditionToConditionTst(branch->condition);
-    __ And(at, i.InputRegister(0), i.InputOperand(1));
-    __ Branch(tlabel, cc, at, Operand(zero_reg));
+    cc = FlagsConditionToConditionTst(condition);
+    masm->And(at, i.InputRegister(0), i.InputOperand(1));
+    masm->Branch(tlabel, cc, at, Operand(zero_reg));
   } else if (instr->arch_opcode() == kMipsAddOvf) {
-    switch (branch->condition) {
+    switch (condition) {
       case kOverflow:
-        __ AddBranchOvf(i.OutputRegister(), i.InputRegister(0),
-                        i.InputOperand(1), tlabel, flabel);
+        masm->AddBranchOvf(i.OutputRegister(), i.InputRegister(0),
+                           i.InputOperand(1), tlabel, flabel);
         break;
       case kNotOverflow:
-        __ AddBranchOvf(i.OutputRegister(), i.InputRegister(0),
-                        i.InputOperand(1), flabel, tlabel);
+        masm->AddBranchOvf(i.OutputRegister(), i.InputRegister(0),
+                           i.InputOperand(1), flabel, tlabel);
         break;
       default:
-        UNSUPPORTED_COND(kMipsAddOvf, branch->condition);
+        UNSUPPORTED_COND(kMipsAddOvf, condition);
         break;
     }
   } else if (instr->arch_opcode() == kMipsSubOvf) {
-    switch (branch->condition) {
+    switch (condition) {
       case kOverflow:
-        __ SubBranchOvf(i.OutputRegister(), i.InputRegister(0),
-                        i.InputOperand(1), tlabel, flabel);
+        masm->SubBranchOvf(i.OutputRegister(), i.InputRegister(0),
+                           i.InputOperand(1), tlabel, flabel);
         break;
       case kNotOverflow:
-        __ SubBranchOvf(i.OutputRegister(), i.InputRegister(0),
-                        i.InputOperand(1), flabel, tlabel);
+        masm->SubBranchOvf(i.OutputRegister(), i.InputRegister(0),
+                           i.InputOperand(1), flabel, tlabel);
         break;
       default:
-        UNSUPPORTED_COND(kMipsAddOvf, branch->condition);
+        UNSUPPORTED_COND(kMipsAddOvf, condition);
         break;
     }
   } else if (instr->arch_opcode() == kMipsMulOvf) {
-    switch (branch->condition) {
+    switch (condition) {
       case kOverflow:
-        __ MulBranchOvf(i.OutputRegister(), i.InputRegister(0),
-                        i.InputOperand(1), tlabel, flabel);
+        masm->MulBranchOvf(i.OutputRegister(), i.InputRegister(0),
+                           i.InputOperand(1), tlabel, flabel);
         break;
       case kNotOverflow:
-        __ MulBranchOvf(i.OutputRegister(), i.InputRegister(0),
-                        i.InputOperand(1), flabel, tlabel);
+        masm->MulBranchOvf(i.OutputRegister(), i.InputRegister(0),
+                           i.InputOperand(1), flabel, tlabel);
         break;
       default:
-        UNSUPPORTED_COND(kMipsMulOvf, branch->condition);
+        UNSUPPORTED_COND(kMipsMulOvf, condition);
         break;
     }
   } else if (instr->arch_opcode() == kMipsCmp) {
-    cc = FlagsConditionToConditionCmp(branch->condition);
-    __ Branch(tlabel, cc, i.InputRegister(0), i.InputOperand(1));
+    cc = FlagsConditionToConditionCmp(condition);
+    masm->Branch(tlabel, cc, i.InputRegister(0), i.InputOperand(1));
   } else if (instr->arch_opcode() == kMipsCmpS) {
-    if (!convertCondition(branch->condition, cc)) {
-      UNSUPPORTED_COND(kMips64CmpS, branch->condition);
+    if (!convertCondition(condition, cc)) {
+      UNSUPPORTED_COND(kMips64CmpS, condition);
     }
     FPURegister left = i.InputOrZeroSingleRegister(0);
     FPURegister right = i.InputOrZeroSingleRegister(1);
     if ((left.is(kDoubleRegZero) || right.is(kDoubleRegZero)) &&
-        !__ IsDoubleZeroRegSet()) {
-      __ Move(kDoubleRegZero, 0.0);
+        !masm->IsDoubleZeroRegSet()) {
+      masm->Move(kDoubleRegZero, 0.0);
     }
-    __ BranchF32(tlabel, nullptr, cc, left, right);
+    masm->BranchF32(tlabel, nullptr, cc, left, right);
   } else if (instr->arch_opcode() == kMipsCmpD) {
-    if (!convertCondition(branch->condition, cc)) {
-      UNSUPPORTED_COND(kMips64CmpD, branch->condition);
+    if (!convertCondition(condition, cc)) {
+      UNSUPPORTED_COND(kMips64CmpD, condition);
     }
     FPURegister left = i.InputOrZeroDoubleRegister(0);
     FPURegister right = i.InputOrZeroDoubleRegister(1);
     if ((left.is(kDoubleRegZero) || right.is(kDoubleRegZero)) &&
-        !__ IsDoubleZeroRegSet()) {
-      __ Move(kDoubleRegZero, 0.0);
+        !masm->IsDoubleZeroRegSet()) {
+      masm->Move(kDoubleRegZero, 0.0);
     }
-    __ BranchF64(tlabel, nullptr, cc, left, right);
+    masm->BranchF64(tlabel, nullptr, cc, left, right);
   } else {
     PrintF("AssembleArchBranch Unimplemented arch_opcode: %d\n",
            instr->arch_opcode());
     UNIMPLEMENTED();
   }
-  if (!branch->fallthru) __ Branch(flabel);  // no fallthru to flabel.
+  if (!fallthru) masm->Branch(flabel);  // no fallthru to flabel.
+}
+
+// Assembles branches after an instruction.
+void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
+  Label* tlabel = branch->true_label;
+  Label* flabel = branch->false_label;
+  AssembleBranchToLabels(this, masm(), instr, branch->condition, tlabel, flabel,
+                         branch->fallthru);
 }
 
 
 void CodeGenerator::AssembleArchJump(RpoNumber target) {
   if (!IsNextInAssemblyOrder(target)) __ Branch(GetLabel(target));
 }
 
 void CodeGenerator::AssembleArchTrap(Instruction* instr,
                                      FlagsCondition condition) {
-  UNREACHABLE();
+  class OutOfLineTrap final : public OutOfLineCode {
+   public:
+    OutOfLineTrap(CodeGenerator* gen, bool frame_elided, Instruction* instr)
+        : OutOfLineCode(gen),
+          frame_elided_(frame_elided),
+          instr_(instr),
+          gen_(gen) {}
+
+    void Generate() final {
+      MipsOperandConverter i(gen_, instr_);
+
+      Runtime::FunctionId trap_id = static_cast<Runtime::FunctionId>(
+          i.InputInt32(instr_->InputCount() - 1));
+      bool old_has_frame = __ has_frame();
+      if (frame_elided_) {
+        __ set_has_frame(true);
+        __ EnterFrame(StackFrame::WASM);
+      }
+      GenerateCallToTrap(trap_id);
+      if (frame_elided_) {
+        __ set_has_frame(old_has_frame);
+      }
+      if (FLAG_debug_code) {
+        __ stop(GetBailoutReason(kUnexpectedReturnFromWasmTrap));
+      }
+    }
+
+   private:
+    void GenerateCallToTrap(Runtime::FunctionId trap_id) {
+      if (trap_id == Runtime::kNumFunctions) {
+        // We cannot test calls to the runtime in cctest/test-run-wasm.
+        // Therefore we emit a call to C here instead of a call to the runtime.
+        // We use the context register as the scratch register, because we do
+        // not have a context here.
+        __ PrepareCallCFunction(0, 0, cp);
+        __ CallCFunction(
+            ExternalReference::wasm_call_trap_callback_for_testing(isolate()),
+            0);
+      } else {
+        __ Move(cp, isolate()->native_context());
+        gen_->AssembleSourcePosition(instr_);
+        __ CallRuntime(trap_id);
+      }
+      ReferenceMap* reference_map =
+          new (gen_->zone()) ReferenceMap(gen_->zone());
+      gen_->RecordSafepoint(reference_map, Safepoint::kSimple, 0,
+                            Safepoint::kNoLazyDeopt);
+    }
+
+    bool frame_elided_;
+    Instruction* instr_;
+    CodeGenerator* gen_;
+  };
+  bool frame_elided = !frame_access_state()->has_frame();
+  auto ool = new (zone()) OutOfLineTrap(this, frame_elided, instr);
+  Label* tlabel = ool->entry();
+  AssembleBranchToLabels(this, masm(), instr, condition, tlabel, nullptr, true);
 }
 
 // Assembles boolean materializations after an instruction.
 void CodeGenerator::AssembleArchBoolean(Instruction* instr,
                                         FlagsCondition condition) {
   MipsOperandConverter i(this, instr);
   Label done;
 
   // Materialize a full 32-bit 1 or 0 value. The result register is always the
   // last output of the instruction.
@@ skipping 566 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8