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transform: make reflection sidetables constant globals

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These globals are (and must be!) never modified by the reflect package.
By marking them as constant, they will be put in read-only memory. This
reduces RAM consumption on microcontrollers.
This commit is contained in:
Ayke van Laethem
2019-12-21 18:50:23 +01:00
committed by Ron Evans
parent 5510dec846
commit 5a70c88483
1 changed files with 4 additions and 0 deletions
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transform/reflect.go
+4
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@@ -160,21 +160,25 @@ func assignTypeCodes(mod llvm.Module, typeSlice typeInfoSlice) {
global := replaceGlobalIntWithArray(mod, "reflect.namedNonBasicTypesSidetable", state.namedNonBasicTypesSidetable) global := replaceGlobalIntWithArray(mod, "reflect.namedNonBasicTypesSidetable", state.namedNonBasicTypesSidetable)
global.SetLinkage(llvm.InternalLinkage) global.SetLinkage(llvm.InternalLinkage)
global.SetUnnamedAddr(true) global.SetUnnamedAddr(true)
global.SetGlobalConstant(true)
} }
if state.needsArrayTypesSidetable { if state.needsArrayTypesSidetable {
global := replaceGlobalIntWithArray(mod, "reflect.arrayTypesSidetable", state.arrayTypesSidetable) global := replaceGlobalIntWithArray(mod, "reflect.arrayTypesSidetable", state.arrayTypesSidetable)
global.SetLinkage(llvm.InternalLinkage) global.SetLinkage(llvm.InternalLinkage)
global.SetUnnamedAddr(true) global.SetUnnamedAddr(true)
global.SetGlobalConstant(true)
} }
if state.needsStructTypesSidetable { if state.needsStructTypesSidetable {
global := replaceGlobalIntWithArray(mod, "reflect.structTypesSidetable", state.structTypesSidetable) global := replaceGlobalIntWithArray(mod, "reflect.structTypesSidetable", state.structTypesSidetable)
global.SetLinkage(llvm.InternalLinkage) global.SetLinkage(llvm.InternalLinkage)
global.SetUnnamedAddr(true) global.SetUnnamedAddr(true)
global.SetGlobalConstant(true)
} }
if state.needsStructNamesSidetable { if state.needsStructNamesSidetable {
global := replaceGlobalIntWithArray(mod, "reflect.structNamesSidetable", state.structNamesSidetable) global := replaceGlobalIntWithArray(mod, "reflect.structNamesSidetable", state.structNamesSidetable)
global.SetLinkage(llvm.InternalLinkage) global.SetLinkage(llvm.InternalLinkage)
global.SetUnnamedAddr(true) global.SetUnnamedAddr(true)
global.SetGlobalConstant(true)
} }
} }