FrozenGene commented on a change in pull request #4657: [CodeGen] Generate blob
use LLVM directly
URL: https://github.com/apache/incubator-tvm/pull/4657#discussion_r364573509
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File path: src/codegen/codegen.cc
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@@ -211,5 +220,30 @@ std::string PackImportsToC(const runtime::Module& mod,
bool system_lib) {
<< "#endif\n";
return os.str();
}
+
+runtime::Module PackImportsToLLVM(const runtime::Module& mod,
+ bool system_lib,
+ const std::string& target) {
+ std::string bin = SerializeModule(mod);
+
+ std::ostringstream os;
+ uint64_t nbytes = bin.length();
+ os << std::hex;
+ for (size_t i = 0; i < sizeof(nbytes); ++i) {
+ os << std::setfill('0') << std::setw(2) << ((nbytes >> (i * 8)) & 0xffUL);
+ }
+ for (size_t i = 0; i < bin.length(); ++i) {
+ int c = bin[i];
+ os << std::setfill('0') << std::setw(2) << (c & 0xff);
+ }
+
+ // Call codegen_blob to generate LLVM module
+ std::string codegen_f_name = "codegen.codegen_blob";
+ // the codegen function.
+ const PackedFunc* codegen_f = runtime::Registry::Get(codegen_f_name);
+ CHECK(codegen_f != nullptr) << "codegen.codegen_blob is not presented.";
+ return (*codegen_f)(os.str(), system_lib, target);
Review comment:
Sorry for missing your comment before. I find one strange thing of this.
When I do this:
```
std::string bin = SerializeModule(mod);
std::string header;
for (size_t i = 0; i < sizeof(nbytes); ++i) {
header.push_back(((nbytes >> (i * 8)) & 0xffUL));
}
std::string blob = header + bin;
std::cout << "blob " << blob; // Could print content
// Call codegen_blob to generate LLVM module
std::string codegen_f_name = "codegen.codegen_blob";
// the codegen function.
const PackedFunc* codegen_f = runtime::Registry::Get(codegen_f_name);
CHECK(codegen_f != nullptr) << "codegen.codegen_blob is not presented.";
runtime::Module m = (*codegen_f)(blob, system_lib, target);
return m;
```
Inside the codegen.codegen_blob function, we can accept the blob string
data. Print the blob is empty. But if we use previous os << std::hex to get hex
data, we could accept the data successfully. Do I miss something?
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