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CType: Add preferredAlignment

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This value corresponds to clang/gcc's `__alignof` (rather than
`_Alignof` which reports the minimum alignment). We don't use this
information yet, but it might be useful for implementing ABIs so it
is included here.
This commit is contained in:
Cody Tapscott
2022-10-22 17:25:02 -07:00
parent c50f33b111
commit c96f85852e
1 changed files with 127 additions and 1 deletions
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128
src/type.zig
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@@ -6926,7 +6926,7 @@ pub const CType = enum {
else => {},
}
// Self-aligned, up to a maximum.
// Next-power-of-two-aligned, up to a maximum.
return @min(
std.math.ceilPowerOfTwoAssert(u16, (self.sizeInBits(target) + 7) / 8),
switch (target.cpu.arch) {
@@ -7013,4 +7013,130 @@ pub const CType = enum {
},
);
}
pub fn preferredAlignment(self: CType, target: Target) u16 {
// Overrides for unusual alignments
switch (target.cpu.arch) {
.arm, .armeb, .thumb, .thumbeb => switch (target.os.tag) {
.netbsd => switch (target.abi) {
.gnueabi,
.gnueabihf,
.eabi,
.eabihf,
.android,
.musleabi,
.musleabihf,
=> {},
else => switch (self) {
.longdouble => return 4,
else => {},
},
},
.ios, .tvos, .watchos => switch (self) {
.longdouble => return 4,
else => {},
},
else => {},
},
.arc => switch (self) {
.longdouble => return 4,
else => {},
},
.avr => switch (self) {
.int, .uint, .long, .ulong, .float, .longdouble => return 1,
.short, .ushort => return 2,
.double => return 4,
.longlong, .ulonglong => return 8,
},
.i386 => switch (target.os.tag) {
.windows, .uefi => switch (self) {
.longdouble => switch (target.abi) {
.gnu, .gnuilp32, .cygnus => return 4,
else => return 8,
},
else => {},
},
else => switch (self) {
.longdouble => return 4,
else => {},
},
},
else => {},
}
// Next-power-of-two-aligned, up to a maximum.
return @min(
std.math.ceilPowerOfTwoAssert(u16, (self.sizeInBits(target) + 7) / 8),
switch (target.cpu.arch) {
.msp430 => @as(u16, 2),
.csky,
.xcore,
.dxil,
.loongarch32,
.tce,
.tcele,
.le32,
.amdil,
.hsail,
.spir,
.spirv32,
.kalimba,
.shave,
.renderscript32,
.ve,
.spu_2,
=> 4,
.arc,
.arm,
.armeb,
.avr,
.thumb,
.thumbeb,
.aarch64_32,
.amdgcn,
.amdil64,
.bpfel,
.bpfeb,
.hexagon,
.hsail64,
.i386,
.loongarch64,
.m68k,
.mips,
.mipsel,
.sparc,
.sparcel,
.sparc64,
.lanai,
.le64,
.nvptx,
.nvptx64,
.r600,
.s390x,
.spir64,
.spirv64,
.renderscript64,
=> 8,
.aarch64,
.aarch64_be,
.mips64,
.mips64el,
.powerpc,
.powerpcle,
.powerpc64,
.powerpc64le,
.riscv32,
.riscv64,
.x86_64,
.wasm32,
.wasm64,
=> 16,
},
);
}
};