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Refactor calling convention settings. (#304)

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Add a calling-convention setting to the `Flags` used as part of the
`TargetIsa`. This allows Cretonne code that generates calls to use the
correct convention, such as when emitting libcalls during legalization
or when the wasm frontend is decoding functions. This setting can be
overridden per-function.

This also adds "fast", "cold", and "fastcall" conventions, with "fast"
as the new default. Note that "fast" and "cold" are not intended to be
ABI-compatible across Cretonne versions.

This will also ensure Windows users will get an `unimplemented!` rather
than silent calling-convention mismatches, which reflects the fact that
Windows calling conventions are not yet implemented.

This also renames SpiderWASM, which isn't camel-case, to Baldrdash,
which is, and which is also a more relevant name.
This commit is contained in:
Dan Gohman
2018-04-22 21:35:18 -07:00
committed by GitHub
parent 8a9e4b9cff
commit c5b15c2396
38 changed files with 226 additions and 161 deletions
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9
lib/codegen/src/ir/function.rs
View File

@@ -6,11 +6,12 @@
use binemit::CodeOffset;
use entity::{EntityMap, PrimaryMap};
use ir;
use ir::{CallConv, DataFlowGraph, ExternalName, Layout, Signature};
use ir::{DataFlowGraph, ExternalName, Layout, Signature};
use ir::{Ebb, ExtFuncData, FuncRef, GlobalVar, GlobalVarData, Heap, HeapData, JumpTable,
JumpTableData, SigRef, StackSlot, StackSlotData};
use ir::{EbbOffsets, InstEncodings, JumpTables, SourceLocs, StackSlots, ValueLocations};
use isa::{EncInfo, Legalize, TargetIsa, Encoding};
use settings::CallConv;
use std::fmt;
use write::write_function;
@@ -86,7 +87,7 @@ impl Function {
/// Clear all data structures in this function.
pub fn clear(&mut self) {
self.signature.clear(ir::CallConv::SystemV);
self.signature.clear(CallConv::Fast);
self.stack_slots.clear();
self.global_vars.clear();
self.heaps.clear();
@@ -99,9 +100,9 @@ impl Function {
self.srclocs.clear();
}
/// Create a new empty, anonymous function with a SystemV calling convention.
/// Create a new empty, anonymous function with a Fast calling convention.
pub fn new() -> Self {
Self::with_name_signature(ExternalName::default(), Signature::new(CallConv::SystemV))
Self::with_name_signature(ExternalName::default(), Signature::new(CallConv::Fast))
}
/// Creates a jump table in the function, to be used by `br_table` instructions.