| Commit message (Collapse) | Author | Age | Files | Lines |
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We need to remember to clear local variables. And there's a good question
here of how Mu supports variables of type stream or table. Or other user-defined
types that inline arrays.
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Function signatures can now take type parameters starting with '_'.
Type parameters in a signature match any concrete type in the call. But
they have to be consistent within a single call.
Things I considered but punted on for now:
- having '_' match anything without needing to be consistent. Wildcards
actually seem harder to understand.
- disallowing top-level '_' types. I'll wait until a concrete use case
for disallowing.
We still don't support *defining* types with type parameters, so for now
this is only useful for calling functions on arrays or streams or handles.
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I think I've got all the stack management down. Time now for the business
logic. There's one failing test.
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type-match? is no longer symmetric; we have to be careful about arg ordering.
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We still need to perform pattern matching.
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Mu will be a language with generics -- but no static dispatch.
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test input:
fn foo {
var y/edx: int <- copy 0
y <- shift-left 2
y <- shift-right 2
y <- shift-right-signed 2
var x: int
shift-left x, 2
shift-right x, 2
shift-right-signed x, 2
}
output:
foo:
# . prologue
55/push-ebp
89/<- %ebp 4/r32/esp
{
$foo:0x00000001:loop:
ff 6/subop/push %edx
ba/copy-to-edx 0/imm32
c1/shift 4/subop/left %edx 2/imm8
c1/shift 5/subop/right-padding-zeroes %edx 2/imm8
c1/shift 7/subop/right-preserving-sign %edx 2/imm8
68/push 0/imm32
c1/shift 4/subop/left *(ebp+0xfffffff8) 2/imm8
c1/shift 5/subop/right-padding-zeroes *(ebp+0xfffffff8) 2/imm8
c1/shift 7/subop/right-preserving-sign *(ebp+0xfffffff8) 2/imm8
81 0/subop/add %esp 0x00000004/imm32
8f 0/subop/pop %edx
}
$foo:0x00000001:break:
# . epilogue
89/<- %esp 5/r32/ebp
5d/pop-to-ebp
c3/return
test input 2:
$ cat x.mu
fn main -> o/ebx: int {
o <- copy 3
o <- shift-left 2
}
output 2:
$ ./translate_mu x.mu
$ ./a.elf
$ echo $?
12
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Bit-shifts aren't quite right yet. We need to emit /imm8 rather than /imm32.
This commit introduces the field, though we don't use it yet.
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I'm not happy with the names.
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- allocate var
- populate var, n
Both rely on the type of `var` to compute the size of the allocation. No
need to repeat the name of the type like in C, C++ or Java.
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Mu exclusively uses hex everywhere for a consistent programming experience
from machine code up. But we all still tend to say '10' when we mean 'ten'.
Catch that early.
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Be more consistent about what we interpret as integer literals.
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This was easier than I'd feared.
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As a side-effect I find that my Linode can print ~100k chars/s. At 50 rows
and 200 columns per screen, it's 10 frames/s.
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https://archive.org/details/akkartik-2min-2020-07-01
In the process I found a bug, added a new syscall, and 'emulated' it.
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