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Add a calling convention to all function signatures.

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A CallConv enum on every function signature makes it possible to
generate calls to functions with different calling conventions within
the same ISA / within a single function.

The calling conventions also serve as a way of customizing Cretonne's
behavior when embedded inside a VM. As an example, the SpiderWASM
calling convention is used to compile WebAssembly functions that run
inside the SpiderMonkey virtual machine.

All function signatures must have a calling convention at the end, so
this changes the textual IL syntax.

Before:

    sig1 = signature(i32, f64) -> f64

After

    sig1 = (i32, f64) -> f64 native
    sig2 = (i32) spiderwasm

When printing functions, the signature goes after the return types:

    function %r1() -> i32, f32 spiderwasm {
    ebb1:
        ...
    }

In the parser, this calling convention is optional and defaults to
"native". This is mostly to avoid updating all the existing test cases
under filetests/. When printing a function, the calling convention is
always included, including for "native" functions.
This commit is contained in:
Jakob Stoklund Olesen
2017-08-02 16:40:35 -07:00
committed by Jakob Stoklund Olesen
parent 5fa991e325
commit c96d4daa20
27 changed files with 211 additions and 144 deletions
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30
cranelift/filetests/isa/riscv/parse-encoding.cton
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@@ -3,32 +3,32 @@ test legalizer
isa riscv
function %parse_encoding(i32 [%x5]) -> i32 [%x10] {
; check: function %parse_encoding(i32 [%x5], i32 link [%x1]) -> i32 [%x10], i32 link [%x1] {
; check: function %parse_encoding(i32 [%x5], i32 link [%x1]) -> i32 [%x10], i32 link [%x1] native {
sig0 = signature(i32 [%x10]) -> i32 [%x10]
; check: sig0 = signature(i32 [%x10]) -> i32 [%x10]
sig0 = (i32 [%x10]) -> i32 [%x10] native
; check: sig0 = (i32 [%x10]) -> i32 [%x10] native
sig1 = signature(i32 [%x10], i32 [%x11]) -> b1 [%x10]
; check: sig1 = signature(i32 [%x10], i32 [%x11]) -> b1 [%x10]
sig1 = (i32 [%x10], i32 [%x11]) -> b1 [%x10] native
; check: sig1 = (i32 [%x10], i32 [%x11]) -> b1 [%x10] native
sig2 = signature(f32 [%f10], i32 [%x12], i32 [%x13]) -> f64 [%f10]
; check: sig2 = signature(f32 [%f10], i32 [%x12], i32 [%x13]) -> f64 [%f10]
sig2 = (f32 [%f10], i32 [%x12], i32 [%x13]) -> f64 [%f10] native
; check: sig2 = (f32 [%f10], i32 [%x12], i32 [%x13]) -> f64 [%f10] native
; Arguments on stack where not necessary
sig3 = signature(f64 [%f10], i32 [0], i32 [4]) -> f64 [%f10]
; check: sig3 = signature(f64 [%f10], i32 [0], i32 [4]) -> f64 [%f10]
sig3 = (f64 [%f10], i32 [0], i32 [4]) -> f64 [%f10] native
; check: sig3 = (f64 [%f10], i32 [0], i32 [4]) -> f64 [%f10] native
; Stack argument before register argument
sig4 = signature(f32 [72], i32 [%x10])
; check: sig4 = signature(f32 [72], i32 [%x10])
sig4 = (f32 [72], i32 [%x10]) native
; check: sig4 = (f32 [72], i32 [%x10]) native
; Return value on stack
sig5 = signature() -> f32 [0]
; check: sig5 = signature() -> f32 [0]
sig5 = () -> f32 [0] native
; check: sig5 = () -> f32 [0] native
; function + signature
fn15 = function %bar(i32 [%x10]) -> b1 [%x10]
; check: sig6 = signature(i32 [%x10]) -> b1 [%x10]
fn15 = function %bar(i32 [%x10]) -> b1 [%x10] native
; check: sig6 = (i32 [%x10]) -> b1 [%x10] native
; nextln: fn0 = sig6 %bar
ebb0(v0: i32):