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Side by Side Diff: src/sksl/ir/SkSLSymbolTable.cpp

Issue 1984363002: initial checkin of SkSL compiler (Closed) Base URL: https://skia.googlesource.com/skia@master
Patch Set: fixed CMake build Created 4 years, 5 months ago
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1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkSLSymbolTable.h"
9
10 namespace SkSL {
11
12 std::vector<std::shared_ptr<FunctionDeclaration>> SymbolTable::GetFunctions(
13 const std::shar ed_ptr<Symbol>& s) {
14 switch (s->fKind) {
15 case Symbol::kFunctionDeclaration_Kind:
16 return { std::static_pointer_cast<FunctionDeclaration>(s) };
17 case Symbol::kUnresolvedFunction_Kind:
18 return ((UnresolvedFunction&) *s).fFunctions;
19 default:
20 return { };
21 }
22 }
23
24 std::shared_ptr<Symbol> SymbolTable::operator[](const std::string& name) {
25 const auto& entry = fSymbols.find(name);
26 if (entry == fSymbols.end()) {
27 if (fParent) {
28 return (*fParent)[name];
29 }
30 return nullptr;
31 }
32 if (fParent) {
33 auto functions = GetFunctions(entry->second);
34 if (functions.size() > 0) {
35 bool modified = false;
36 std::shared_ptr<Symbol> previous = (*fParent)[name];
37 if (previous) {
38 auto previousFunctions = GetFunctions(previous);
39 for (const std::shared_ptr<FunctionDeclaration>& prev : previous Functions) {
40 bool found = false;
41 for (const std::shared_ptr<FunctionDeclaration>& current : f unctions) {
42 if (current->matches(*prev)) {
43 found = true;
44 break;
45 }
46 }
47 if (!found) {
48 functions.push_back(prev);
49 modified = true;
50 }
51 }
52 if (modified) {
53 ASSERT(functions.size() > 1);
54 return std::shared_ptr<Symbol>(new UnresolvedFunction(functi ons));
55 }
56 }
57 }
58 }
59 return entry->second;
60 }
61
62 void SymbolTable::add(const std::string& name, std::shared_ptr<Symbol> symbol) {
63 const auto& existing = fSymbols.find(name);
64 if (existing == fSymbols.end()) {
65 fSymbols[name] = symbol;
66 } else if (symbol->fKind == Symbol::kFunctionDeclaration_Kind) {
67 const std::shared_ptr<Symbol>& oldSymbol = existing->second;
68 if (oldSymbol->fKind == Symbol::kFunctionDeclaration_Kind) {
69 std::vector<std::shared_ptr<FunctionDeclaration>> functions;
70 functions.push_back(std::static_pointer_cast<FunctionDeclaration >(oldSymbol));
71 functions.push_back(std::static_pointer_cast<FunctionDeclaration >(symbol));
72 fSymbols[name].reset(new UnresolvedFunction(std::move(functions) ));
73 } else if (oldSymbol->fKind == Symbol::kUnresolvedFunction_Kind) {
74 std::vector<std::shared_ptr<FunctionDeclaration>> functions;
75 for (const auto& f : ((UnresolvedFunction&) *oldSymbol).fFunctio ns) {
76 functions.push_back(f);
77 }
78 functions.push_back(std::static_pointer_cast<FunctionDeclaration >(symbol));
79 fSymbols[name].reset(new UnresolvedFunction(std::move(functions) ));
80 }
81 } else {
82 fErrorReporter.error(symbol->fPosition, "symbol '" + name + "' was a lready defined");
83 }
84 }
85 } // namespace
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