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// Copyright 2018 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.
#ifndef V8_WASM_BASELINE_LIFTOFF_COMPILER_H_
#define V8_WASM_BASELINE_LIFTOFF_COMPILER_H_
#include "src/wasm/function-compiler.h"
namespace v8 {
namespace internal {
class AccountingAllocator;
class Counters;
namespace wasm {
struct CompilationEnv;
class DebugSideTable;
struct FunctionBody;
class WasmFeatures;
// Note: If this list changes, also the histogram "V8.LiftoffBailoutReasons"
// on the chromium side needs to be updated.
// Deprecating entries is always fine. Repurposing works if you don't care about
// temporary mix-ups. Increasing the number of reasons {kNumBailoutReasons} is
// more tricky, and might require introducing a new (updated) histogram.
enum LiftoffBailoutReason : int8_t {
// Nothing actually failed.
kSuccess = 0,
// Compilation failed, but not because of Liftoff.
kDecodeError = 1,
// Liftoff is not implemented on that architecture.
kUnsupportedArchitecture = 2,
// More complex code would be needed because a CPU feature is not present.
kMissingCPUFeature = 3,
// Liftoff does not implement a complex (and rare) instruction.
kComplexOperation = 4,
// Unimplemented proposals:
kSimd = 5,
kRefTypes = 6,
kExceptionHandling = 7,
kMultiValue = 8,
kTailCall = 9,
kAtomics = 10,
kBulkMemory = 11,
kNonTrappingFloatToInt = 12,
kGC = 13,
// A little gap, for forward compatibility.
// Any other reason (use rarely; introduce new reasons if this spikes).
kOtherReason = 20,
// Marker:
kNumBailoutReasons
};
struct LiftoffOptions {
Counters* counters = nullptr;
WasmFeatures* detected_features = nullptr;
base::Vector<const int> breakpoints = {};
std::unique_ptr<DebugSideTable>* debug_sidetable = nullptr;
int dead_breakpoint = 0;
int32_t* max_steps = nullptr;
int32_t* nondeterminism = nullptr;
// We keep the macro as small as possible by offloading the actual DCHECK and
// assignment to another function. This makes debugging easier.
#define SETTER(field) \
template <typename T> \
LiftoffOptions& set_##field(T new_value) { \
return Set<decltype(field)>(&field, new_value); \
}
SETTER(counters)
SETTER(detected_features)
SETTER(breakpoints)
SETTER(debug_sidetable)
SETTER(dead_breakpoint)
SETTER(max_steps)
SETTER(nondeterminism)
#undef SETTER
private:
template <typename T>
LiftoffOptions& Set(T* ptr, T new_value) {
// The field must still have its default value.
DCHECK_EQ(*ptr, T{});
*ptr = new_value;
return *this;
}
};
V8_EXPORT_PRIVATE WasmCompilationResult
ExecuteLiftoffCompilation(CompilationEnv*, const FunctionBody&, int func_index,
ForDebugging, const LiftoffOptions& = {});
V8_EXPORT_PRIVATE std::unique_ptr<DebugSideTable> GenerateLiftoffDebugSideTable(
const WasmCode*);
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_BASELINE_LIFTOFF_COMPILER_H_
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