Letian Jiang letian-jiang

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letian-jiang / install_openssl_newer_ubuntu.sh

Last active November 25, 2024 14:01 — forked from fabiomello/install_openssl_newer_ubuntu.sh

Install OpenSSL 1.0 On Ubuntu

	mkdir openssl1.0
	cd openssl1.0
	wget http://archive.debian.org/debian/pool/main/o/openssl/libssl1.0.0_1.0.2l-1~bpo8+1_amd64.deb
	wget http://archive.debian.org/debian/pool/main/o/openssl/libssl-dev_1.0.2l-1~bpo8+1_amd64.deb
	wget http://archive.debian.org/debian/pool/main/o/openssl/openssl_1.0.2l-1~bpo8+1_amd64.deb
	dpkg -x libssl-dev_1.0.2l-1~bpo8+1_amd64.deb .
	dpkg -x libssl1.0.0_1.0.2l-1~bpo8+1_amd64.deb .
	dpkg -x openssl_1.0.2l-1~bpo8+1_amd64.deb .

	cd usr/lib/x86_64-linux-gnu/

letian-jiang / DWARF VM line machine notes

Created October 15, 2024 09:54 — forked from mistymntncop/DWARF VM line machine notes

	DWARF has a clever (too clever?) VM representation for source line to asm mapping.
	VM has state which represents virtual program and source line counters.
	The DW_LNS_advance_pc instruction advances the program counter while the DW_LNS_advance_line instruction
	advances the line counter. Both these instructions encode the "advance amount" value as a variably sized immediate operand.
	The DW_LNS_copy instructions tells us that current VM pc and source counter states correspond together
	both counter values can be copied to a array of line numbers and assembly addresses. When the VM reads a byte from the
	instruction stream it compares this value with a VM specified "opcode base" variable. If the value is below the "opcode base"
	then it represents an opcode for an instruction. If the value is above the "opcode base" then it represents the operand for
	an implicit "instruction". This special implicit "instruction" advances both the program and source line counters at once
	using this single byte value. But how

letian-jiang / a_minimal_example.c

Created October 12, 2024 09:43 — forked from yyny/a_minimal_example.c

GDB JIT Interface -- Minimal Example

	/* I spent an entire evening getting JIT debug symbols to work in GDB.
	* Here is a minimal example to get you started.
	* Have fun!
	*/

	#include <errno.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>

letian-jiang / ptr_ownership_semantics.cpp

Created May 12, 2023 17:46 — forked from israelchen/ptr_ownership_semantics.cpp

Ownership semantics for pointers in C++

	#include <iostream>
	#include <memory>

	using namespace std;

	class Resource {
	public:

	Resource(string id) : _id(id) {
	cout << "Resource::Resource(" << _id << ")" << endl;