2bb70812a8
This patch adds a new pragma for functions and globals to set the
section name. This can be useful to place a function or global in a
special device specific section, for example:
* Functions may be placed in RAM to make them run faster, or in flash
(if RAM is the default) to not let them take up RAM.
* DMA memory may only be placed in a special memory area.
* Some RAM may be faster than other RAM, and some globals may be
performance critical thus placing them in this special RAM area can
help.
* Some (large) global variables may need to be placed in external RAM,
which can be done by placing them in a special section.
To use it, you have to place a function or global in a special section,
for example:
//go:section .externalram
var externalRAMBuffer [1024]byte
This can then be placed in a special section of the linker script, for
example something like this:
.bss.extram (NOLOAD) : {
*(.externalram)
} > ERAM
59 строки
1,7 КиБ
LLVM
59 строки
1,7 КиБ
LLVM
; ModuleID = 'pragma.go'
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source_filename = "pragma.go"
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32--wasi"
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@extern_global = external global [0 x i8], align 1
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@main.alignedGlobal = hidden global [4 x i32] zeroinitializer, align 32
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@main.alignedGlobal16 = hidden global [4 x i32] zeroinitializer, align 16
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@main.globalInSection = hidden global i32 0, section ".special_global_section", align 4
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@undefinedGlobalNotInSection = external global i32, align 4
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@main.multipleGlobalPragmas = hidden global i32 0, section ".global_section", align 1024
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declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*)
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define hidden void @main.init(i8* %context, i8* %parentHandle) unnamed_addr {
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entry:
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ret void
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}
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define void @extern_func() #0 {
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entry:
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ret void
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}
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define hidden void @somepkg.someFunction1(i8* %context, i8* %parentHandle) unnamed_addr {
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entry:
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ret void
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}
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declare void @somepkg.someFunction2(i8*, i8*)
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; Function Attrs: inlinehint
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define hidden void @main.inlineFunc(i8* %context, i8* %parentHandle) unnamed_addr #1 {
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entry:
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ret void
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}
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; Function Attrs: noinline
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define hidden void @main.noinlineFunc(i8* %context, i8* %parentHandle) unnamed_addr #2 {
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entry:
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ret void
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}
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define hidden void @main.functionInSection(i8* %context, i8* %parentHandle) unnamed_addr section ".special_function_section" {
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entry:
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ret void
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}
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define void @exportedFunctionInSection() #3 section ".special_function_section" {
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entry:
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ret void
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}
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declare void @main.undefinedFunctionNotInSection(i8*, i8*)
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attributes #0 = { "wasm-export-name"="extern_func" }
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attributes #1 = { inlinehint }
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attributes #2 = { noinline }
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attributes #3 = { "wasm-export-name"="exportedFunctionInSection" }
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