1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2  * vim: set ts=8 sts=2 et sw=2 tw=80:
3  *
4  * Copyright 2016 Mozilla Foundation
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  *     http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18 
19 #ifndef asmjs_wasm_baseline_compile_h
20 #define asmjs_wasm_baseline_compile_h
21 
22 #include "wasm/WasmGenerator.h"
23 
24 namespace js {
25 namespace wasm {
26 
27 // Return whether BaselineCompileFunction can generate code on the current
28 // device.  Usually you do *not* want to call this, you want
29 // BaselineAvailable().
30 [[nodiscard]] bool BaselinePlatformSupport();
31 
32 // Generate adequate code quickly.
33 [[nodiscard]] bool BaselineCompileFunctions(
34     const ModuleEnvironment& moduleEnv, const CompilerEnvironment& compilerEnv,
35     LifoAlloc& lifo, const FuncCompileInputVector& inputs, CompiledCode* code,
36     UniqueChars* error);
37 
38 class BaseLocalIter {
39  private:
40   using ConstValTypeRange = mozilla::Range<const ValType>;
41 
42   const ValTypeVector& locals_;
43   const ArgTypeVector& args_;
44   jit::WasmABIArgIter<ArgTypeVector> argsIter_;
45   size_t index_;
46   int32_t frameSize_;
47   int32_t nextFrameSize_;
48   int32_t frameOffset_;
49   int32_t stackResultPointerOffset_;
50   jit::MIRType mirType_;
51   bool done_;
52 
53   void settle();
54   int32_t pushLocal(size_t nbytes);
55 
56  public:
57   BaseLocalIter(const ValTypeVector& locals, const ArgTypeVector& args,
58                 bool debugEnabled);
59   void operator++(int);
done()60   bool done() const { return done_; }
61 
mirType()62   jit::MIRType mirType() const {
63     MOZ_ASSERT(!done_);
64     return mirType_;
65   }
frameOffset()66   int32_t frameOffset() const {
67     MOZ_ASSERT(!done_);
68     MOZ_ASSERT(frameOffset_ != INT32_MAX);
69     return frameOffset_;
70   }
index()71   size_t index() const {
72     MOZ_ASSERT(!done_);
73     return index_;
74   }
75   // The size in bytes taken up by the previous `index_` locals, also including
76   // fixed allocations like the DebugFrame and "hidden" locals like a spilled
77   // stack results pointer.
frameSize()78   int32_t frameSize() const { return frameSize_; }
79 
stackResultPointerOffset()80   int32_t stackResultPointerOffset() const {
81     MOZ_ASSERT(args_.hasSyntheticStackResultPointerArg());
82     MOZ_ASSERT(stackResultPointerOffset_ != INT32_MAX);
83     return stackResultPointerOffset_;
84   }
85 
86 #ifdef DEBUG
isArg()87   bool isArg() const {
88     MOZ_ASSERT(!done_);
89     return !argsIter_.done();
90   }
91 #endif
92 };
93 
94 }  // namespace wasm
95 }  // namespace js
96 
97 #endif  // asmjs_wasm_baseline_compile_h
98