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Update readme tagline
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‎Makefile_many‎

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@@ -117,7 +117,7 @@ set_profile_flags:
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test: all
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@\
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if [ -x $(TEST) ]; then \
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if [ -x $(TEST) ]; then \
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./$(TEST) '$(OUT_EXT)' ;\
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else\
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fail=false ;\

‎README.md‎

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[![Build Status](https://travis-ci.org/cirosantilli/cpp-cheat.svg?branch=master)](https://travis-ci.org/cirosantilli/cpp-cheat)
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C and C++ information, cheatsheets and mini-projects.
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C and C++ minimal examples. Asserts used wherever possible. Cheatsheet, tutorial and mini-projects.
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Relies on [C++ boilerplate](https://github.com/cirosantilli/cpp-boilerplate) to factor code out. See [its documentation](https://github.com/cirosantilli/cpp-boilerplate/blob/master/README.md) for information on how to use this project.
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‎cpp/constexpr.cpp‎

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//i = 1;
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}
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{
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constexpr int i = 0;
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&i;
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}
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// WARN: unitialized constexpr
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{
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//constexpr int i;

‎gcc/asm.c‎

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General syntax:
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asm (
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"mov $1, %%eax;" //commands string
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: "=X" (y), //outputs
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"mov $1, %%eax;" // commands string
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: "=X" (y), // outputs
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"=X" (z)
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: "X" (x) //inputs
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: "%eax" //clobbered registers
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: "X" (x) // inputs
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: "%eax" // clobbered registers
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);
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where:
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/*
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# m constraint
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Instructs gcc to store keep value of given expressions into RAM.
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Instructs GCC to keep value of given expressions into RAM.
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This is the most basic way to get/set values of c variables in assembly code.
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This is the most basic way to get/set values of C variables in assembly code.
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*/
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{
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int in = 1;
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"movl %%eax, %0"
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: "=m" (out)
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: "m" (in)
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: "%eax" /* eax will be modified, so we have to list it in the clobber list */
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: "%eax"
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);
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assert(out == 1);
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}
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assert(out == -1.0);
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}
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/* Input and ouput can be the same memory location. */
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/* Input and output can be the same memory location. */
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{
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float x = 1.0;
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/*x = -x*/
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}
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/*
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# register constraints
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# Register constraints
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tell gcc to automatically read memory into registers or write registers into memory
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https://gcc.gnu.org/onlinedocs/gcc/Simple-Constraints.html
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this is more precise and complicated than using `m`
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Tell GCC to automatically read memory into registers or write registers into memory
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This is more precise and complicated than using `m`:
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- r: gcc chooses any free register
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- a: %eax
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note how we can do an `inc` operation directly on `%1` and `%0`
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so they must both already be inside a registers as expected
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gcc just makes sure they are writen from/to memory before/after the operations
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GCC just makes sure they are written from/to memory before/after the operations.
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*/
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{
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int in = 0;

‎gdb/commands.md‎

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@@ -242,7 +242,7 @@ Like `si` by for `next`.
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Don't enter `call`.
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Does enter `int` in 16-bit code. In that case, you can use instead:
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Does enter `int` in 16-bit code. In that case, you can use instead: TODO <http://stackoverflow.com/questions/24491516/how-to-step-over-interrupt-calls-when-debugging-a-bootloader-bios-with-gdb-and-q> If only we could get the size of the current instruction automatically.
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### until
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printf "rax = %d\n", $rax
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### echo
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Like `printf`, but:
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- does not take `"`
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- does not take format strings
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Backslash escapes are considered.
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E.g.:
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echo asdf\n
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Just use the saner `printf` instead.
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### disas
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### disassemble

‎gdb/disassemble.py‎

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"""
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Disassemble some instructions.
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https://sourceware.org/gdb/onlinedocs/gdb/Architectures-In-Python.html#Architectures-In-Python
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https://sourceware.org/gdb/onlinedocs/gdb/Architectures-In-Python.html
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"""
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gdb.execute('file big_function.out', to_string=True)
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pc = gdb.selected_frame().pc()
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# 1 instruction.
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print(arch.disassemble(pc)[0]['asm'])
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print(arch.disassemble(pc)[0])

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