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cgen: support closures on arm32 as well (#12875)

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2021-12-17 13:26:24 +01:00
committed by GitHub
parent e5e3979e45
commit d80dd77adf
2 changed files with 42 additions and 10 deletions
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45
vlib/v/gen/c/cheaders.v
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@@ -58,15 +58,24 @@ static inline void __sort_ptr(uintptr_t a[], bool b[], int l) {
}
'
fn arm_bytes(nargs int) string {
fn arm64_bytes(nargs int) string {
// start:
// ldr x16, start-0x08
// ldr x16, start-0x08
// ldr x<REG>, start-0x10
// br x16
bytes := '0xd0, 0xff, 0xff, 0x58, 0x6<REG>, 0xff, 0xff, 0x58, 0x00, 0x02, 0x1f, 0xd6'
return bytes.replace('<REG>', nargs.str())
}
fn arm32_bytes(nargs int) string {
// start:
// ldr r9, start-0x4
// ldr r<REG>, start-0x8
// bx r9
bytes := '0x0c, 0x90, 0x1f, 0xe5, 0x14, 0x<REG>0, 0x1f, 0xe5, 0x19, 0xff, 0x2f, 0xe1'
return bytes.replace('<REG>', nargs.str())
}
// Heavily based on Chris Wellons's work
// https://nullprogram.com/blog/2017/01/08/
@@ -74,7 +83,7 @@ fn c_closure_helpers(pref &pref.Preferences) string {
if pref.os == .windows {
verror('closures are not implemented on Windows yet')
}
if pref.arch !in [.amd64, .arm64] {
if pref.arch !in [.amd64, .arm64, .arm32] {
verror('closures are not implemented on this architecture yet: $pref.arch')
}
mut builder := strings.new_builder(2048)
@@ -109,17 +118,35 @@ static unsigned char __closure_thunk[6][13] = {
builder.write_string('
static unsigned char __closure_thunk[6][12] = {
{
${arm_bytes(0)}
${arm64_bytes(0)}
}, {
${arm_bytes(1)}
${arm64_bytes(1)}
}, {
${arm_bytes(2)}
${arm64_bytes(2)}
}, {
${arm_bytes(3)}
${arm64_bytes(3)}
}, {
${arm_bytes(4)}
${arm64_bytes(4)}
}, {
${arm_bytes(5)}
${arm64_bytes(5)}
},
};
')
} else if pref.arch == .arm32 {
builder.write_string('
static unsigned char __closure_thunk[6][12] = {
{
${arm32_bytes(0)}
}, {
${arm32_bytes(1)}
}, {
${arm32_bytes(2)}
}, {
${arm32_bytes(3)}
}, {
${arm32_bytes(4)}
}, {
${arm32_bytes(5)}
},
};
')