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20e02704c4
mal/nasm
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Ben Dudson 20e02704c4 Add clean target 
Deletes executables and object files
2018-01-03 15:43:22 +00:00
..
core.asm Moved macro-related functions to start of core Env 2017-12-27 23:34:30 +00:00
Dockerfile Dockerfile xenial and binutils install 2018-01-02 23:37:42 +00:00
env.asm Step 5: Tail call optimisation 2017-11-11 01:04:11 +00:00
exceptions.asm Moving error handler into exceptions.asm 2017-12-26 23:41:15 +00:00
macros.mac Adding map and throw functions 2017-12-08 08:19:57 +00:00
Makefile Add clean target 2018-01-03 15:43:22 +00:00
printer.asm Fix bug in rest and println 2017-12-14 23:06:19 +00:00
reader.asm Add meta, with-meta and ^ reader 2017-12-12 23:49:07 +00:00
README.md Adding README.md file and Make all target 2017-12-27 23:33:03 +00:00
run Step0 (input/output) passes tests 2017-10-09 00:10:03 +01:00
step0_repl.asm Step0 (input/output) passes tests 2017-10-09 00:10:03 +01:00
step1_read_print.asm All tests pass 2017-12-27 17:32:01 +00:00
step2_eval.asm All tests pass 2017-12-27 17:32:01 +00:00
step3_env.asm All tests pass 2017-12-27 17:32:01 +00:00
step4_if_fn_do.asm All tests pass 2017-12-27 17:32:01 +00:00
step5_tco.asm All tests pass 2017-12-27 17:32:01 +00:00
step6_file.asm All tests pass 2017-12-27 17:32:01 +00:00
step7_quote.asm Fix memory leak, eval releases AST 2017-11-29 15:13:10 +00:00
step8_macros.asm Step 8 passes 2017-12-26 23:55:18 +00:00
step9_try.asm Step 9 passes again 2017-12-26 23:51:58 +00:00
stepA_mal.asm Step 9 passes again 2017-12-26 23:51:58 +00:00
system.asm Add time-ms function 2017-12-15 23:11:20 +00:00
types.asm All tests pass 2017-12-27 17:32:01 +00:00

README.md

x86_64 NASM implementation

Notes and known issues:

  • No library dependencies, only Linux system calls

  • Simple readline implemented, just supporting backspace for editing

  • Reference counting used for memory management. No attempt is made to find circular references, so leaks are possible. In particular defining a function with def! creates a circular reference loop.

  • The exception/error handling just resets the stack and jumps to a handler, so does not release memory

  • Memory is allocated by two fixed-size allocators (Cons and Array objects) which have limits specified in types.asm. If more memory is needed then this must currently be done at compile-time, but adding sys_brk calls could be done.

  • The hash map implementation is just a list of key-value pairs. Moving symbols around in the core environment makes a significant difference (20-30%) to the performance test. A simple optimisation could be to move items when found to the start of the list so that frequently searched keys are nearer the front.

  • conj function not yet implemented

  • *env* symbol evaluates to current Environment.