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* Warn on pointless (un)conditional branchingMiquel Sabaté Solà2026-02-021-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Sometimes performing some 'jmp'/'jsr' can be quite pointless, and the programmer might not be fully aware of this because of the layout of the code. Imagine: .proc foo ;; code jmp bar .endproc ;; Documentation, comments, extra space, etc. .proc bar ;; whatever .endproc The 'jmp' in the code above tries to perform a call stack optimization, but it's actually not needed because the next instruction after 'jmp' is the one inside of 'bar', but that's obfuscated because of the layout. In these sort of cases (and also for 'jsr' and branches) warn the programmer about it so it can remove that instruction. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Allow constants in asan:reserve statementsMiquel Sabaté Solà2025-12-151-0/+1
| | | | | | | | | | | | | | | | This way, if you define a constant like: MY_BUFFER_LEN_IN_BYTES = $10 You can then declare your buffer like so: zp_buffer = $00 ; asan:reserve MY_BUFFER_LEN_IN_BYTES And then further in the code you can rely on just using the constant for bound checking, and then the address sanitizer will check on bound checks via static analysis as well. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* asan: Add fixes on absolute/indirect addressingMiquel Sabaté Solà2025-09-031-0/+1
| | | | | | The check was not being applied on certain conditions. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Add a check for variable namesMiquel Sabaté Solà2025-09-031-0/+4
| | | | | | | This check ensures that asan-friendly names actually match their expected scope. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Validate that memory access is done via variablesMiquel Sabaté Solà2025-09-031-0/+4
| | | | | | | | | | | | | The address sanitizer is now able to detect whenever in an instruction a memory access is done without using variables. This is now detected for all instructions except for branching, which falls outside of this scope. Moreover, simple arithmetics is allowed and bounds are checked for simple cases. That being said, more involved bound checks should be done with other tools (e.g. emulators). Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Add a warning for each unused variableMiquel Sabaté Solà2025-09-022-0/+1
| | | | Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* nasm: Implement the -D flagMiquel Sabaté Solà2025-01-223-0/+0
This allows users to define variables directly from the command line, which is useful for testing purposes. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>