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add alloca as an expression

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Folkert 2023-07-29 20:10:52 +02:00
parent 750234f2de
commit cdd2aab217
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15 changed files with 171 additions and 14 deletions
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16
crates/compiler/gen_dev/src/generic64/mod.rs
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@ -3007,11 +3007,17 @@ impl<
ASM::and_reg64_reg64_reg64(buf, sym_reg, sym_reg, ptr_reg);
}
fn build_alloca(&mut self, sym: Symbol, value: Symbol, element_layout: InLayout<'a>) {
fn build_alloca(&mut self, sym: Symbol, value: Option<Symbol>, element_layout: InLayout<'a>) {
// 1. acquire some stack space
let element_width = self.interner().stack_size(element_layout);
let allocation = self.debug_symbol("stack_allocation");
let ptr = self.debug_symbol("ptr");
if element_width == 0 {
self.storage_manager.claim_pointer_stack_area(sym);
return;
}
let base_offset = self
.storage_manager
.claim_stack_area(&allocation, element_width);
@ -3021,7 +3027,13 @@ impl<
ASM::mov_reg64_reg64(&mut self.buf, ptr_reg, CC::BASE_PTR_REG);
ASM::add_reg64_reg64_imm32(&mut self.buf, ptr_reg, ptr_reg, base_offset);
self.build_ptr_store(sym, ptr, value, element_layout);
if let Some(value) = value {
self.build_ptr_store(sym, ptr, value, element_layout);
} else {
// this is now a pointer to uninitialized memory!
let r = self.storage_manager.claim_general_reg(&mut self.buf, &sym);
ASM::mov_reg64_reg64(&mut self.buf, r, ptr_reg);
}
}
fn expr_box(