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// Copyright 2022 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/base/utils/random-number-generator.h"
#include "src/codegen/assembler-inl.h"
#include "src/codegen/code-stub-assembler.h"
#include "src/codegen/macro-assembler.h"
#include "src/objects/code-inl.h"
#include "test/common/code-assembler-tester.h"
#include "test/unittests/compiler/function-tester.h"
#include "test/unittests/test-utils.h"
namespace v8 {
namespace internal {
namespace compiler {
#define __ assembler.
namespace {
// Function that takes a number of pointer-sized integer arguments, calculates a
// weighted sum of them and returns it.
Handle<Code> BuildCallee(Isolate* isolate, CallDescriptor* call_descriptor) {
CodeAssemblerTester tester(isolate, call_descriptor, "callee");
CodeStubAssembler assembler(tester.state());
int param_slots = static_cast<int>(call_descriptor->ParameterSlotCount());
TNode<IntPtrT> sum = __ IntPtrConstant(0);
for (int i = 0; i < param_slots; ++i) {
TNode<WordT> product = __ IntPtrMul(__ UncheckedParameter<IntPtrT>(i),
__ IntPtrConstant(i + 1));
sum = __ Signed(__ IntPtrAdd(sum, product));
}
__ Return(sum);
return tester.GenerateCodeCloseAndEscape();
}
// Function that tail-calls another function with a number of pointer-sized
// integer arguments.
Handle<Code> BuildCaller(Isolate* isolate, CallDescriptor* call_descriptor,
CallDescriptor* callee_descriptor) {
CodeAssemblerTester tester(isolate, call_descriptor, "caller");
CodeStubAssembler assembler(tester.state());
std::vector<Node*> params;
// The first parameter is always the callee.
Handle<CodeT> code =
ToCodeT(BuildCallee(isolate, callee_descriptor), isolate);
params.push_back(__ HeapConstant(code));
int param_slots = static_cast<int>(callee_descriptor->ParameterSlotCount());
for (int i = 0; i < param_slots; ++i) {
params.push_back(__ IntPtrConstant(i));
}
DCHECK_EQ(param_slots + 1, params.size());
tester.raw_assembler_for_testing()->TailCallN(callee_descriptor,
param_slots + 1, params.data());
return tester.GenerateCodeCloseAndEscape();
}
// Setup function, which calls "caller".
Handle<Code> BuildSetupFunction(Isolate* isolate,
CallDescriptor* caller_descriptor,
CallDescriptor* callee_descriptor) {
CodeAssemblerTester tester(isolate, 0);
CodeStubAssembler assembler(tester.state());
std::vector<Node*> params;
// The first parameter is always the callee.
Handle<CodeT> code = ToCodeT(
BuildCaller(isolate, caller_descriptor, callee_descriptor), isolate);
params.push_back(__ HeapConstant(code));
// Set up arguments for "Caller".
int param_slots = static_cast<int>(caller_descriptor->ParameterSlotCount());
for (int i = 0; i < param_slots; ++i) {
// Use values that are different from the ones we will pass to this
// function's callee later.
params.push_back(__ IntPtrConstant(i + 42));
}
DCHECK_EQ(param_slots + 1, params.size());
TNode<IntPtrT> intptr_result =
__ UncheckedCast<IntPtrT>(tester.raw_assembler_for_testing()->CallN(
caller_descriptor, param_slots + 1, params.data()));
__ Return(__ SmiTag(intptr_result));
return tester.GenerateCodeCloseAndEscape();
}
CallDescriptor* CreateDescriptorForStackArguments(Zone* zone, int param_slots) {
LocationSignature::Builder locations(zone, 1,
static_cast<size_t>(param_slots));
locations.AddReturn(LinkageLocation::ForRegister(kReturnRegister0.code(),
MachineType::IntPtr()));
for (int i = 0; i < param_slots; ++i) {
locations.AddParam(LinkageLocation::ForCallerFrameSlot(
i - param_slots, MachineType::IntPtr()));
}
return zone->New<CallDescriptor>(
CallDescriptor::kCallCodeObject, // kind
MachineType::AnyTagged(), // target MachineType
LinkageLocation::ForAnyRegister(
MachineType::AnyTagged()), // target location
locations.Build(), // location_sig
param_slots, // stack parameter slots
Operator::kNoProperties, // properties
kNoCalleeSaved, // callee-saved registers
kNoCalleeSavedFp, // callee-saved fp
CallDescriptor::kNoFlags); // flags
}
} // namespace
class RunTailCallsTest : public TestWithContextAndZone {
protected:
// Test a tail call from a caller with n parameters to a callee with m
// parameters. All parameters are pointer-sized.
void TestHelper(int n, int m) {
Isolate* isolate = i_isolate();
CanonicalHandleScope canonical(isolate);
CallDescriptor* caller_descriptor =
CreateDescriptorForStackArguments(zone(), n);
CallDescriptor* callee_descriptor =
CreateDescriptorForStackArguments(zone(), m);
Handle<Code> setup =
BuildSetupFunction(isolate, caller_descriptor, callee_descriptor);
FunctionTester ft(isolate, setup, 0);
Handle<Object> result = ft.Call().ToHandleChecked();
int expected = 0;
for (int i = 0; i < m; ++i) expected += (i + 1) * i;
CHECK_EQ(expected, Handle<Smi>::cast(result)->value());
}
};
#undef __
TEST_F(RunTailCallsTest, CallerOddCalleeEven) {
TestHelper(1, 0);
TestHelper(1, 2);
TestHelper(3, 2);
TestHelper(3, 4);
}
TEST_F(RunTailCallsTest, CallerOddCalleeOdd) {
TestHelper(1, 1);
TestHelper(1, 3);
TestHelper(3, 1);
TestHelper(3, 3);
}
TEST_F(RunTailCallsTest, CallerEvenCalleeEven) {
TestHelper(0, 0);
TestHelper(0, 2);
TestHelper(2, 0);
TestHelper(2, 2);
}
TEST_F(RunTailCallsTest, CallerEvenCalleeOdd) {
TestHelper(0, 1);
TestHelper(0, 3);
TestHelper(2, 1);
TestHelper(2, 3);
}
TEST_F(RunTailCallsTest, FuzzStackParamCount) {
const int kNumTests = 20;
const int kMaxSlots = 30;
base::RandomNumberGenerator* const rng =
i_isolate()->random_number_generator();
for (int i = 0; i < kNumTests; ++i) {
int n = rng->NextInt(kMaxSlots);
int m = rng->NextInt(kMaxSlots);
TestHelper(n, m);
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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