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boot: cimport.fch, the C header importer written in Finch on libclang

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Reads functions (with variadics and why one is unsupported), enum and #define
constants, extern variables and structs with their layout, the same as
src/cimport.cpp. It calls libclang through Finch's own C import, so compiling
it is what the bootstrap will have to do. Checked with the C++ compiler:
stdio.h gives 90 functions and 347 constants; EOF is -1, stdout is ptr[C.FILE].
This commit is contained in:
Nexoniarz 2026-10-25 19:40:50 +01:00
commit f71ae8b1ef
3 changed files with 579 additions and 1 deletions
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9
boot/ast.fch
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@ -9,6 +9,7 @@ struct Type {
[]Type elem
str name
str module
int count // "fixed": [N]T, only inside C structs
}
fn simple(str kind) -> Type {
@ -42,7 +43,10 @@ fn same(Type a, Type b) -> bool {
if a.kind == "struct" || a.kind == "named" {
return a.name == b.name && a.module == b.module
}
if a.kind == "array" || a.kind == "ptr" || a.kind == "map" {
if a.kind == "fixed" && a.count != b.count {
return false
}
if a.kind == "array" || a.kind == "ptr" || a.kind == "map" || a.kind == "fixed" {
if a.elem.len != b.elem.len {
return false
}
@ -60,6 +64,9 @@ fn show(Type t) -> str {
if t.kind == "array" {
return "[]" + show(t.elem[0])
}
if t.kind == "fixed" {
return "[" + str(t.count) + "]" + show(t.elem[0])
}
if t.kind == "map" {
return "map[" + show(t.elem[0]) + "]" + show(t.elem[1])
}