Implement the 'test print-cfg' sub-test.

Move the CFG tests into the filetests directory.

Remove the tests directory, there are no more shell-driven tests left.

cranelift/tests/cfg/README.rst

@@ -1,14 +0,0 @@
-CFG tests
-============
-
-This directory contains test cases for the Cretonne cfg printer.
-
-Each test case consists of a `foo.cton` input file annotated with its expected connections.
-Annotations are comments of the form: `ebbx:insty -> ebbz` where ebbx is connected to ebbz via
-a branch or jump instruction at line y. Instructions are labeled by line number starting from zero: `inst0` .. `instn`.
-
-
-Each input file is run through the `cton-util print-cfg` command and the
-output is compared against the specially formatted comments to ensure that
-expected connections exist. This scheme allows for changes to graph style
-without the need to update tests.

cranelift/tests/cfg/loop.cton

@@ -1,33 +0,0 @@
-; For testing cfg generation. This code is nonsense.
-
-function nonsense(i32, i32) -> f32 {
-; check: digraph nonsense {
-; regex: I=\binst\d+\b
-; check: label="{ebb0 | <$(BRZ=$I)>brz ebb2 | <$(JUMP=$I)>jump ebb1}"]
-
-ebb0(v1: i32, v2: i32):
-    v3 = f64const 0x0.0
-    brz v2, ebb2            ; unordered: ebb0:$BRZ -> ebb2
-    v4 = iconst.i32 0
-    jump ebb1(v4)           ; unordered: ebb0:$JUMP -> ebb1
-
-ebb1(v5: i32):
-    v6 = imul_imm v5, 4
-    v7 = iadd v1, v6
-    v8 = f32const 0.0
-    v9 = f32const 0.0
-    v10 = f32const 0.0
-    v11 = fadd v9, v10
-    v12 = iadd_imm v5, 1
-    v13 = icmp ult, v12, v2
-    brnz v13, ebb1(v12)     ; unordered: ebb1:inst12 -> ebb1
-    v14 = f64const 0.0
-    v15 = f64const 0.0
-    v16 = fdiv v14, v15
-    v17 = f32const 0.0
-    return v17
-
-ebb2:
-    v100 = f32const 0.0
-    return v100
-}

cranelift/tests/cfg/run.sh

@@ -1,36 +0,0 @@
-#!/bin/bash
-
-# Go to tests directory.
-cd $(dirname "$0")/..
-
-# The path to cton-util should be in $CTONUTIL.
-if [ -z "$CTONUTIL" ]; then
-    CTONUTIL=../src/tools/target/debug/cton-util
-fi
-
-if [ ! -x "$CTONUTIL" ]; then
-    echo "Can't fund executable cton-util: $CTONUTIL" 1>&2
-    exit 1
-fi
-
-declare -a fails
-
-for testcase in $(find cfg -name '*.cton'); do
-    if "${CTONUTIL}" print-cfg "$testcase" | "${CTONUTIL}" filecheck "$testcase"; then
-        echo OK $testcase
-    else
-        fails=(${fails[@]} "$testcase")
-        echo FAIL $testcase
-    fi
-done
-
-if [ ${#fails[@]} -ne 0 ]; then
-    echo
-    echo Failures:
-    for f in "${fails[@]}"; do
-        echo "  $f"
-    done
-    exit 1
-else
-    echo "All passed"
-fi

cranelift/tests/cfg/traps_early.cton

@@ -1,19 +0,0 @@
-; For testing cfg generation. This code explores the implications of encountering
-; a terminating instruction before any connections have been made.
-
-function nonsense(i32) {
-; check: digraph nonsense {
-
-ebb0(v1: i32):
-    trap
-    brnz v1, ebb2   ; unordered: ebb0:inst1 -> ebb2
-    jump ebb1       ; unordered: ebb0:inst2 -> ebb1
-
-ebb1:
-    v2 = iconst.i32 0
-    v3 = iadd v1, v3
-    jump ebb0(v3)   ; unordered: ebb1:inst5 -> ebb0
-
-ebb2:
-    return v1
-}

cranelift/tests/cfg/unused_node.cton

@@ -1,20 +0,0 @@
-; For testing cfg generation where some block is never reached.
-
-function not_reached(i32) -> i32 {
-; check: digraph not_reached {
-; check:     ebb0 [shape=record, label="{ebb0 | <inst0>brnz ebb2}"]
-; check:     ebb1 [shape=record, label="{ebb1 | <inst4>jump ebb0}"]
-; check:     ebb2 [shape=record, label="{ebb2}"]
-
-ebb0(v0: i32):
-    brnz v0, ebb2       ; unordered: ebb0:inst0 -> ebb2
-    trap
-
-ebb1:
-    v1 = iconst.i32 1
-    v2 = iadd v0, v1
-    jump ebb0(v2)       ; unordered: ebb1:inst4 -> ebb0
-
-ebb2:
-    return v0
-}