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Added the code to embed the binary schema to the source (--bfbs-gen-embed). (#5701)

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* Added the code to embed the binary schema to the source.
This is pulled forward from a old PR #5162 that will be closed.

* Update idl_gen_cpp.cpp

Added a small comment to trigger a new build. The build was failing in a strange location and doesn't look like it has anything to do with the code.

* Moved the EscapeAndWrapBuffer to util.cpp and did some formating.

* One more camelCases removed and renamed some variables.

* wrapped_line_xxx should have been passed as a const reference in the first place.

* Moved the bfbs embed sample to it's own file.

* Missed moving the namespace back.

* Moved the embedded bfbs to test.cpp instead of using a sample.

* Missed adding the generation of embedded bfbs to the build.

* See if this makes the build happier.

* Fixed a in-compatable cpp output of the generated header.

* Did some changes to reflect the code review comments.
1. Update the EscapeAndWrapBuffer to BufferToHexText and fixed a variable name.
2. Moved the include of the embedded binary schema to all the other includes.

* Moved some code to inline the instead of using a local variable.

* Moved the BufferToHexText back to be a inline function in util.h
This commit is contained in:
sjoblom65
2020-01-24 17:55:34 -05:00
committed by Wouter van Oortmerssen
parent 3f677f2414
commit 47026ea6ba
11 changed files with 856 additions and 35 deletions
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116
src/idl_gen_cpp.cpp
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@@ -53,6 +53,33 @@ static std::string GeneratedFileName(const std::string &path,
return path + file_name + "_generated.h";
}
static std::string GenIncludeGuard(const std::string &file_name,
const Namespace &name_space,
const std::string &postfix= "") {
// Generate include guard.
std::string guard = file_name;
// Remove any non-alpha-numeric characters that may appear in a filename.
struct IsAlnum {
bool operator()(char c) const { return !is_alnum(c); }
};
guard.erase(std::remove_if(guard.begin(), guard.end(), IsAlnum()),
guard.end());
guard = "FLATBUFFERS_GENERATED_" + guard;
guard += "_";
// For further uniqueness, also add the namespace.
for (auto it = name_space.components.begin();
it != name_space.components.end(); ++it) {
guard += *it + "_";
}
// Anything extra to add to the guard?
if (!postfix.empty()) {
guard += postfix + "_";
}
guard += "H_";
std::transform(guard.begin(), guard.end(), guard.begin(), ToUpper);
return guard;
}
namespace cpp {
enum CppStandard { CPP_STD_X0 = 0, CPP_STD_11, CPP_STD_17 };
@@ -182,28 +209,6 @@ class CppGenerator : public BaseGenerator {
for (auto kw = keywords; *kw; kw++) keywords_.insert(*kw);
}
std::string GenIncludeGuard() const {
// Generate include guard.
std::string guard = file_name_;
// Remove any non-alpha-numeric characters that may appear in a filename.
struct IsAlnum {
bool operator()(char c) const { return !is_alnum(c); }
};
guard.erase(std::remove_if(guard.begin(), guard.end(), IsAlnum()),
guard.end());
guard = "FLATBUFFERS_GENERATED_" + guard;
guard += "_";
// For further uniqueness, also add the namespace.
auto name_space = parser_.current_namespace_;
for (auto it = name_space->components.begin();
it != name_space->components.end(); ++it) {
guard += *it + "_";
}
guard += "H_";
std::transform(guard.begin(), guard.end(), guard.begin(), ToUpper);
return guard;
}
void GenIncludeDependencies() {
int num_includes = 0;
for (auto it = parser_.native_included_files_.begin();
@@ -241,13 +246,73 @@ class CppGenerator : public BaseGenerator {
std::string Name(const EnumVal &ev) const { return EscapeKeyword(ev.name); }
bool generate_bfbs_embed() {
code_.Clear();
code_ += "// " + std::string(FlatBuffersGeneratedWarning()) + "\n\n";
// If we don't have a root struct definition,
if (!parser_.root_struct_def_) {
// put a comment in the output why there is no code generated.
code_ += "// Binary schema not generated, no root struct found";
} else {
auto &struct_def = *parser_.root_struct_def_;
const auto include_guard = GenIncludeGuard(file_name_, *struct_def.defined_namespace, "bfbs");
code_ += "#ifndef " + include_guard;
code_ += "#define " + include_guard;
code_ += "";
if (parser_.opts.gen_nullable) {
code_ += "#pragma clang system_header\n\n";
}
SetNameSpace(struct_def.defined_namespace);
auto name = Name(struct_def);
code_.SetValue("STRUCT_NAME", name);
// Create code to return the binary schema data.
auto binary_schema_hex_text = BufferToHexText(parser_.builder_.GetBufferPointer(),
parser_.builder_.GetSize(), 105, " ", "");
code_ += "struct {{STRUCT_NAME}}BinarySchema {";
code_ += " static const uint8_t *data() {";
code_ += " // Buffer containing the binary schema.";
code_ += " static const uint8_t bfbsData[" + NumToString(parser_.builder_.GetSize()) + "] = {";
code_ += binary_schema_hex_text;
code_ += " };";
code_ += " return bfbsData;";
code_ += " }";
code_ += " static size_t size() {";
code_ += " return " + NumToString(parser_.builder_.GetSize()) + ";";
code_ += " }";
code_ += " const uint8_t *begin() {";
code_ += " return data();";
code_ += " }";
code_ += " const uint8_t *end() {";
code_ += " return data() + size();";
code_ += " }";
code_ += "};";
code_ += "";
if (cur_name_space_) SetNameSpace(nullptr);
// Close the include guard.
code_ += "#endif // " + include_guard;
}
// We are just adding "_bfbs" to the generated filename.
const auto file_path = GeneratedFileName(path_, file_name_ + "_bfbs");
const auto final_code = code_.ToString();
return SaveFile(file_path.c_str(), final_code, false);
}
// Iterate through all definitions we haven't generate code for (enums,
// structs, and tables) and output them to a single file.
bool generate() {
code_.Clear();
code_ += "// " + std::string(FlatBuffersGeneratedWarning()) + "\n\n";
const auto include_guard = GenIncludeGuard();
const auto include_guard = GenIncludeGuard(file_name_, *parser_.current_namespace_);
code_ += "#ifndef " + include_guard;
code_ += "#define " + include_guard;
code_ += "";
@@ -519,7 +584,10 @@ class CppGenerator : public BaseGenerator {
const auto file_path = GeneratedFileName(path_, file_name_);
const auto final_code = code_.ToString();
return SaveFile(file_path.c_str(), final_code, false);
// Save the file and optionally generate the binary schema code.
return SaveFile(file_path.c_str(), final_code, false) &&
(!parser_.opts.binary_schema_gen_embed || generate_bfbs_embed());
}
private: