mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
55e82004a2
(also referred to as flow-sensitive mode) so that the evaluator can be used by clients to constant evaluate instructions in a SILFunction body one by one following the flow of control.
82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
//===-----ConstantEvaluatorTester.cpp - Test Constant Evaluator -----------===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See https://swift.org/LICENSE.txt for license information
|
|
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "sil-constant-evaluation-tester"
|
|
#include "swift/SIL/SILConstants.h"
|
|
#include "swift/SILOptimizer/PassManager/Passes.h"
|
|
#include "swift/SILOptimizer/PassManager/Transforms.h"
|
|
#include "swift/SILOptimizer/Utils/ConstExpr.h"
|
|
|
|
using namespace swift;
|
|
|
|
namespace {
|
|
|
|
/// A compiler pass for testing constant evaluator in the step-wise evaluation
|
|
/// mode. The pass evaluates SIL functions whose names start with "interpret"
|
|
/// and outputs the constant value returned by the function or diagnostics if
|
|
/// the evaluation fails.
|
|
class ConstantEvaluatorTester : public SILFunctionTransform {
|
|
|
|
bool shouldInterpret() {
|
|
auto *fun = getFunction();
|
|
return fun->getName().startswith("interpret");
|
|
}
|
|
|
|
void run() override {
|
|
SILFunction *fun = getFunction();
|
|
|
|
if (!shouldInterpret() || fun->empty())
|
|
return;
|
|
|
|
llvm::errs() << "@" << fun->getName() << "\n";
|
|
|
|
SymbolicValueBumpAllocator allocator;
|
|
ConstExprStepEvaluator stepEvaluator(allocator, fun);
|
|
|
|
for (auto currI = fun->getEntryBlock()->begin();;) {
|
|
auto *inst = &(*currI);
|
|
|
|
if (auto *returnInst = dyn_cast<ReturnInst>(inst)) {
|
|
auto returnVal =
|
|
stepEvaluator.lookupConstValue(returnInst->getOperand());
|
|
|
|
if (!returnVal) {
|
|
llvm::errs() << "Returns unknown"
|
|
<< "\n";
|
|
}
|
|
llvm::errs() << "Returns " << returnVal.getValue() << "\n";
|
|
break;
|
|
}
|
|
|
|
Optional<SILBasicBlock::iterator> nextInstOpt;
|
|
Optional<SymbolicValue> errorVal;
|
|
|
|
std::tie(nextInstOpt, errorVal) = stepEvaluator.evaluate(currI);
|
|
if (errorVal.hasValue()) {
|
|
// Diagnose the error.
|
|
assert(errorVal->getKind() == SymbolicValue::Unknown);
|
|
errorVal->emitUnknownDiagnosticNotes(inst->getLoc());
|
|
break;
|
|
}
|
|
|
|
assert(nextInstOpt);
|
|
currI = nextInstOpt.getValue();
|
|
}
|
|
}
|
|
};
|
|
|
|
} // end anonymous namespace
|
|
|
|
SILTransform *swift::createConstantEvaluatorTester() {
|
|
return new ConstantEvaluatorTester();
|
|
}
|