1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// 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_COMPILATION_ENVIRONMENT_H_
#define V8_WASM_COMPILATION_ENVIRONMENT_H_
#include <memory>
#include "src/wasm/wasm-features.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-tier.h"
namespace v8 {
namespace internal {
class Counters;
namespace wasm {
class NativeModule;
class WasmCode;
class WasmError;
enum RuntimeExceptionSupport : bool {
kRuntimeExceptionSupport = true,
kNoRuntimeExceptionSupport = false
};
enum UseTrapHandler : bool { kUseTrapHandler = true, kNoTrapHandler = false };
enum LowerSimd : bool { kLowerSimd = true, kNoLowerSimd = false };
// The {CompilationEnv} encapsulates the module data that is used during
// compilation. CompilationEnvs are shareable across multiple compilations.
struct CompilationEnv {
// A pointer to the decoded module's static representation.
const WasmModule* const module;
// True if trap handling should be used in compiled code, rather than
// compiling in bounds checks for each memory access.
const UseTrapHandler use_trap_handler;
// If the runtime doesn't support exception propagation,
// we won't generate stack checks, and trap handling will also
// be generated differently.
const RuntimeExceptionSupport runtime_exception_support;
// The smallest size of any memory that could be used with this module, in
// bytes.
const uint64_t min_memory_size;
// The largest size of any memory that could be used with this module, in
// bytes.
const uint64_t max_memory_size;
// Features enabled for this compilation.
const WasmFeatures enabled_features;
const LowerSimd lower_simd;
constexpr CompilationEnv(const WasmModule* module,
UseTrapHandler use_trap_handler,
RuntimeExceptionSupport runtime_exception_support,
const WasmFeatures& enabled_features,
LowerSimd lower_simd = kNoLowerSimd)
: module(module),
use_trap_handler(use_trap_handler),
runtime_exception_support(runtime_exception_support),
min_memory_size(module ? module->initial_pages * uint64_t{kWasmPageSize}
: 0),
max_memory_size((module && module->has_maximum_pages
? module->maximum_pages
: max_initial_mem_pages()) *
uint64_t{kWasmPageSize}),
enabled_features(enabled_features),
lower_simd(lower_simd) {}
};
// The wire bytes are either owned by the StreamingDecoder, or (after streaming)
// by the NativeModule. This class abstracts over the storage location.
class WireBytesStorage {
public:
virtual ~WireBytesStorage() = default;
virtual Vector<const uint8_t> GetCode(WireBytesRef) const = 0;
};
// Callbacks will receive either {kFailedCompilation} or both
// {kFinishedBaselineCompilation} and {kFinishedTopTierCompilation}, in that
// order. If tier up is off, both events are delivered right after each other.
enum class CompilationEvent : uint8_t {
kFinishedBaselineCompilation,
kFinishedTopTierCompilation,
kFailedCompilation,
kFinishedRecompilation
};
// The implementation of {CompilationState} lives in module-compiler.cc.
// This is the PIMPL interface to that private class.
class CompilationState {
public:
using callback_t = std::function<void(CompilationEvent)>;
~CompilationState();
void AbortCompilation();
void SetError();
void SetWireBytesStorage(std::shared_ptr<WireBytesStorage>);
V8_EXPORT_PRIVATE std::shared_ptr<WireBytesStorage> GetWireBytesStorage()
const;
void AddCallback(callback_t);
bool failed() const;
V8_EXPORT_PRIVATE bool baseline_compilation_finished() const;
V8_EXPORT_PRIVATE bool top_tier_compilation_finished() const;
V8_EXPORT_PRIVATE bool recompilation_finished() const;
// Override {operator delete} to avoid implicit instantiation of {operator
// delete} with {size_t} argument. The {size_t} argument would be incorrect.
void operator delete(void* ptr) { ::operator delete(ptr); }
CompilationState() = delete;
private:
// NativeModule is allowed to call the static {New} method.
friend class NativeModule;
// The CompilationState keeps a {std::weak_ptr} back to the {NativeModule}
// such that it can keep it alive (by regaining a {std::shared_ptr}) in
// certain scopes.
static std::unique_ptr<CompilationState> New(
const std::shared_ptr<NativeModule>&, std::shared_ptr<Counters>);
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_COMPILATION_ENVIRONMENT_H_
|