Mu - 040tests.cc

1 //: Automatically aggregate functions starting with 'test-' into a test suite 2 //: called 'run-tests'. Running this function will run all tests. 3 //: 4 //: This is actually SubX's first (trivial) compiler. We generate all the code 5 //: needed for the 'run-tests' function. 6 //: 7 //: By convention, temporary functions needed by tests will start with 8 //: '_test-'. 9 10 //: We don't rely on any transforms running in previous layers, but this layer 11 //: knows about labels and will emit labels for previous layers to transform. 12 :(after "Begin Transforms") 13 Transform.push_back(create_test_function); 14 15 :(code) 16 void test_run_test() { 17 Mem.push_back(vma(0xbd000000)); // manually allocate memory 18 Reg[ESP].u = 0xbd000100; 19 run( 20 "== code 0x1\n" // code segment 21 "main:\n" 22 " e8/call run-tests/disp32\n" // 5 bytes 23 " f4/halt\n" // 1 byte 24 "test-foo:\n" pre { line-height: 125%; } td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; } span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; } td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; 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font-weight: bold } /* Name.Class */ .highlight .no { color: #003366; font-weight: bold } /* Name.Constant */ .highlight .nd { color: #555555 } /* Name.Decorator */ .highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */ .highlight .nl { color: #336699; font-style: italic } /* Name.Label */ .highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; 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== Goal

A memory-safe language with a simple translator to x86 that can be feasibly written in x86.

== Definitions of terms

Memory-safe: it should be impossible to:
  a) create a pointer out of arbitrary data, or
  b) to access heap memory after it's been freed.

Simple: do all the work in a 2-pass translator:
  Pass 1: check each instruction's types in isolation.
  Pass 2: emit code for each instruction in isolation.

== types

int
char
(address _ t), t ∋ {stack, heap, global}
(array _ t), t ∋ {stack, heap, global}

stack addresses can't be copied to heap or global
heap addresses can't be copied [1]
global addresses you're free to use anywhere

[1] (address _ heap) can't be copied or stored, can't be part of a type or
choice. Only thing you can do with it is access it from the register you wrote
it to. And even that not past a call instruction. Important detail: `free()`
is a call. So an address to something on the heap can never be invalid if the
program type-checks.

<reg x> : (address T m) <- advance <reg/mem> : (array T m), <reg offset> : (index T)