From 19195e2bbdcd7a0db8f84732ce54b1c9d07c006c Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sun, 13 Jun 2021 18:24:16 +0200
Subject: Make task an abstract class and make CC and LD versions of it.

---
 task_cc.cc | 267 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 267 insertions(+)
 create mode 100644 task_cc.cc

(limited to 'task_cc.cc')

diff --git a/task_cc.cc b/task_cc.cc
new file mode 100644
index 0000000..2a65698
--- /dev/null
+++ b/task_cc.cc
@@ -0,0 +1,267 @@
+#include "task_cc.h"
+
+#include <iostream>
+#include <fstream>
+#include <unistd.h>
+#include <cstring>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <spawn.h>
+
+#include "libcppbuild.h"
+#include "settings.h"
+
+namespace
+{
+std::string readFile(const std::string &fileName)
+{
+	std::ifstream ifs(fileName.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
+
+	std::ifstream::pos_type fileSize = ifs.tellg();
+	ifs.seekg(0, std::ios::beg);
+
+	std::vector<char> bytes(fileSize);
+	ifs.read(bytes.data(), fileSize);
+
+	return std::string(bytes.data(), fileSize);
+}
+
+std::vector<std::string> readDeps(const std::string& depFile)
+{
+	if(!std::filesystem::exists(depFile))
+	{
+		return {};
+	}
+
+	auto str = readFile(depFile);
+
+	std::vector<std::string> output;
+	std::string tmp;
+	bool start{false};
+	bool in_whitespace{false};
+	for(const auto& c : str)
+	{
+		if(c == '\\' || c == '\n')
+		{
+			continue;
+		}
+
+		if(c == ':')
+		{
+			start = true;
+			continue;
+		}
+
+		if(!start)
+		{
+			continue;
+		}
+
+		if(c == ' ' || c == '\t')
+		{
+			if(in_whitespace)
+			{
+				continue;
+			}
+
+			if(!tmp.empty())
+			{
+				output.push_back(tmp);
+			}
+			tmp.clear();
+			in_whitespace = true;
+		}
+		else
+		{
+			in_whitespace = false;
+			tmp += c;
+		}
+	}
+
+	if(!tmp.empty())
+	{
+		output.push_back(tmp);
+	}
+
+	return output;
+}
+} // namespace ::
+
+TaskCC::TaskCC(const BuildConfiguration& config, const Settings& settings,
+               const std::string& source)
+	: config(config)
+	, settings(settings)
+{
+	sourceFile = source;
+	targetFile = settings.builddir / sourceFile.stem();
+	targetFile += ".o";
+	depsFile = settings.builddir / sourceFile.stem();
+	depsFile += ".d";
+}
+
+bool TaskCC::dirty()
+{
+	if(!std::filesystem::exists(sourceFile))
+	{
+		//std::cout << "Missing source file: " << std::string(sourceFile) << "\n";
+		return true;
+	}
+
+	if(!std::filesystem::exists(targetFile))
+	{
+		//std::cout << "Missing targetFile\n";
+		return true;
+	}
+
+	if(!std::filesystem::exists(depsFile))
+	{
+		//std::cout << "Missing depsFile\n";
+		return true;
+	}
+
+	if(std::filesystem::last_write_time(sourceFile) >
+	   std::filesystem::last_write_time(depsFile))
+	{
+		//std::cout << "The sourceFile newer than depsFile\n";
+		return true;
+	}
+
+	auto depList = readDeps(depsFile);
+	for(const auto& dep : depList)
+	{
+		if(!std::filesystem::exists(dep) ||
+		   std::filesystem::last_write_time(targetFile) <
+		   std::filesystem::last_write_time(dep))
+		{
+			//std::cout << "The targetFile older than " << std::string(dep) << "\n";
+			return true;
+		}
+	}
+
+	if(std::filesystem::last_write_time(sourceFile) >
+	   std::filesystem::last_write_time(targetFile))
+	{
+		//std::cout << "The targetFile older than sourceFile\n";
+		return true;
+	}
+
+	return false;
+}
+
+int parent_waitpid(pid_t pid)
+{
+	int status;
+
+	if(waitpid(pid, &status, 0) != pid)
+	{
+		return 1;
+	}
+
+	return status;
+}
+int TaskCC::run()
+{
+	if(!std::filesystem::exists(sourceFile))
+	{
+		std::cout << "Missing source file: " << std::string(sourceFile) << "\n";
+		return 1;
+	}
+
+	std::string comp = "/usr/bin/g++";
+	auto flags = config.cxxflags;
+	if(std::string(sourceFile.extension()) == ".c")
+	{
+		comp = "/usr/bin/gcc";
+		flags = config.cflags;
+	}
+
+	char source[256];
+	strcpy(source, std::string(sourceFile).data());
+	char target[256];
+	strcpy(target, std::string(targetFile).data());
+	char pwd[256];
+	strcpy(pwd, std::string(std::filesystem::current_path()).data());
+	std::vector<const char*> argv;
+	//args.push_back("/bin/echo");
+	if(comp == "/usr/bin/gcc")
+	{
+		argv.push_back("/usr/bin/gcc");
+	}
+	else
+	{
+		argv.push_back("/usr/bin/g++");
+	}
+
+	argv.push_back("-MMD");
+	argv.push_back("-c");
+	argv.push_back(source);
+	argv.push_back("-o");
+	argv.push_back(target);
+
+	for(const auto& flag : flags)
+	{
+		argv.push_back(flag.data());
+	}
+
+	std::string cmd;
+	for(const auto& arg : argv)
+	{
+		if(arg == nullptr)
+		{
+			break;
+		}
+		if(!cmd.empty())
+		{
+			cmd += " ";
+		}
+		cmd += arg;
+	}
+	std::cout << cmd << "\n";
+
+#if 0
+	auto pid = vfork();
+	if(pid == 0)
+	{
+		execv(comp.data(), (char**)argv.data());
+	}
+	auto ret = parent_waitpid(pid);
+#elif 0
+	pid_t pid;
+	if(posix_spawn(&pid, comp.data(), nullptr, nullptr, (char**)argv.data(), nullptr))
+	{
+		return 1;//exit(1);
+	}
+	auto ret = parent_waitpid(pid);
+#else
+	auto ret = system(cmd.data());
+#endif
+
+	return ret;
+}
+
+int TaskCC::clean()
+{
+	if(std::filesystem::exists(targetFile))
+	{
+		std::cout << "Removing " << std::string(targetFile) << "\n";
+		std::filesystem::remove(targetFile);
+	}
+
+	if(std::filesystem::exists(depsFile))
+	{
+		std::cout << "Removing " << std::string(depsFile) << "\n";
+		std::filesystem::remove(depsFile);
+	}
+
+	return 0;
+}
+
+std::vector<std::string> TaskCC::depends() const
+{
+	return {};
+}
+
+std::string TaskCC::target() const
+{
+	return targetFile;
+}
-- 
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