1 // Copyright (c) 2017 The Khronos Group Inc.
2 // Copyright (c) 2017 Valve Corporation
3 // Copyright (c) 2017 LunarG Inc.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 //     http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 
17 #include "source/opt/inline_exhaustive_pass.h"
18 
19 #include <utility>
20 
21 namespace spvtools {
22 namespace opt {
23 
InlineExhaustive(Function * func)24 bool InlineExhaustivePass::InlineExhaustive(Function* func) {
25   bool modified = false;
26   // Using block iterators here because of block erasures and insertions.
27   for (auto bi = func->begin(); bi != func->end(); ++bi) {
28     for (auto ii = bi->begin(); ii != bi->end();) {
29       if (IsInlinableFunctionCall(&*ii)) {
30         // Inline call.
31         std::vector<std::unique_ptr<BasicBlock>> newBlocks;
32         std::vector<std::unique_ptr<Instruction>> newVars;
33         GenInlineCode(&newBlocks, &newVars, ii, bi);
34         // If call block is replaced with more than one block, point
35         // succeeding phis at new last block.
36         if (newBlocks.size() > 1) UpdateSucceedingPhis(newBlocks);
37         // Replace old calling block with new block(s).
38 
39         // We need to kill the name and decorations for the call, which
40         // will be deleted.  Other instructions in the block will be moved to
41         // newBlocks.  We don't need to do anything with those.
42         context()->KillNamesAndDecorates(&*ii);
43 
44         bi = bi.Erase();
45 
46         for (auto& bb : newBlocks) {
47           bb->SetParent(func);
48         }
49         bi = bi.InsertBefore(&newBlocks);
50         // Insert new function variables.
51         if (newVars.size() > 0)
52           func->begin()->begin().InsertBefore(std::move(newVars));
53         // Restart inlining at beginning of calling block.
54         ii = bi->begin();
55         modified = true;
56       } else {
57         ++ii;
58       }
59     }
60   }
61   return modified;
62 }
63 
ProcessImpl()64 Pass::Status InlineExhaustivePass::ProcessImpl() {
65   // Attempt exhaustive inlining on each entry point function in module
66   ProcessFunction pfn = [this](Function* fp) { return InlineExhaustive(fp); };
67   bool modified = context()->ProcessEntryPointCallTree(pfn);
68   return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
69 }
70 
71 InlineExhaustivePass::InlineExhaustivePass() = default;
72 
Process()73 Pass::Status InlineExhaustivePass::Process() {
74   InitializeInline();
75   return ProcessImpl();
76 }
77 
78 }  // namespace opt
79 }  // namespace spvtools
80