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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* Copyright 2014 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef wasm_frame_iterator_h
#define wasm_frame_iterator_h
#include "js/ProfilingFrameIterator.h"
class JSAtom;
namespace js {
class WasmActivation;
namespace jit { class MacroAssembler; }
namespace wasm {
class CallSite;
class Code;
class CodeRange;
class SigIdDesc;
struct CallThunk;
struct FuncOffsets;
struct ProfilingOffsets;
struct TrapOffset;
// Iterates over the frames of a single WasmActivation, called synchronously
// from C++ in the thread of the asm.js.
//
// The one exception is that this iterator may be called from the interrupt
// callback which may be called asynchronously from asm.js code; in this case,
// the backtrace may not be correct. That being said, we try our best printing
// an informative message to the user and at least the name of the innermost
// function stack frame.
class FrameIterator
{
const WasmActivation* activation_;
const Code* code_;
const CallSite* callsite_;
const CodeRange* codeRange_;
uint8_t* fp_;
uint8_t* pc_;
bool missingFrameMessage_;
void settle();
public:
explicit FrameIterator();
explicit FrameIterator(const WasmActivation& activation);
void operator++();
bool done() const;
const char* filename() const;
const char16_t* displayURL() const;
bool mutedErrors() const;
JSAtom* functionDisplayAtom() const;
unsigned lineOrBytecode() const;
inline void* fp() const { return fp_; }
inline uint8_t* pc() const { return pc_; }
};
// An ExitReason describes the possible reasons for leaving compiled wasm code
// or the state of not having left compiled wasm code (ExitReason::None).
enum class ExitReason : uint32_t
{
None, // default state, the pc is in wasm code
ImportJit, // fast-path call directly into JIT code
ImportInterp, // slow-path call into C++ Invoke()
Native, // call to native C++ code (e.g., Math.sin, ToInt32(), interrupt)
Trap // call to trap handler for the trap in WasmActivation::trap
};
// Iterates over the frames of a single WasmActivation, given an
// asynchrously-interrupted thread's state. If the activation's
// module is not in profiling mode, the activation is skipped.
class ProfilingFrameIterator
{
const WasmActivation* activation_;
const Code* code_;
const CodeRange* codeRange_;
uint8_t* callerFP_;
void* callerPC_;
void* stackAddress_;
ExitReason exitReason_;
void initFromFP();
public:
ProfilingFrameIterator();
explicit ProfilingFrameIterator(const WasmActivation& activation);
ProfilingFrameIterator(const WasmActivation& activation,
const JS::ProfilingFrameIterator::RegisterState& state);
void operator++();
bool done() const { return !codeRange_; }
void* stackAddress() const { MOZ_ASSERT(!done()); return stackAddress_; }
const char* label() const;
};
// Prologue/epilogue code generation
void
GenerateExitPrologue(jit::MacroAssembler& masm, unsigned framePushed, ExitReason reason,
ProfilingOffsets* offsets);
void
GenerateExitEpilogue(jit::MacroAssembler& masm, unsigned framePushed, ExitReason reason,
ProfilingOffsets* offsets);
void
GenerateFunctionPrologue(jit::MacroAssembler& masm, unsigned framePushed, const SigIdDesc& sigId,
FuncOffsets* offsets);
void
GenerateFunctionEpilogue(jit::MacroAssembler& masm, unsigned framePushed, FuncOffsets* offsets);
// Runtime patching to enable/disable profiling
void
ToggleProfiling(const Code& code, const CallSite& callSite, bool enabled);
void
ToggleProfiling(const Code& code, const CallThunk& callThunk, bool enabled);
void
ToggleProfiling(const Code& code, const CodeRange& codeRange, bool enabled);
} // namespace wasm
} // namespace js
#endif // wasm_frame_iterator_h
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