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gc: drop support for 'precise' globals

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Precise globals require a whole program optimization pass that is hard
to support when building packages separately. This patch removes support
for these globals by converting the last use (Linux) to use
linker-defined symbols instead.

For details, see: https://github.com/tinygo-org/tinygo/issues/2870
This commit is contained in:
Ayke van Laethem
2022-05-30 13:47:09 +02:00
committed by Ron Evans
parent 5c488e3145
commit 2d61972475
9 changed files with 39 additions and 244 deletions
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transform/testdata/gc-globals.ll
Vendored
-33
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@@ -1,33 +0,0 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
%runtime._string = type { i8*, i32 }
%runtime._interface = type { i32, i8* }
@globalInt = global i32 5
@globalString = global %runtime._string zeroinitializer
@globalInterface = global %runtime._interface zeroinitializer
@constString = constant %runtime._string zeroinitializer
@constInterface = constant %runtime._interface zeroinitializer
@runtime.trackedGlobalsLength = external global i32
@runtime.trackedGlobalsBitmap = external global [0 x i8]
@runtime.trackedGlobalsStart = external global i32
define void @main() {
%1 = load i32, i32* @globalInt
%2 = load %runtime._string, %runtime._string* @globalString
%3 = load %runtime._interface, %runtime._interface* @globalInterface
%4 = load %runtime._string, %runtime._string* @constString
%5 = load %runtime._interface, %runtime._interface* @constInterface
ret void
}
define void @runtime.markGlobals() {
; Very small subset of what runtime.markGlobals would really do.
; Just enough to make sure the transformation is correct.
%1 = load i32, i32* @runtime.trackedGlobalsStart
%2 = load i32, i32* @runtime.trackedGlobalsLength
%3 = getelementptr inbounds [0 x i8], [0 x i8]* @runtime.trackedGlobalsBitmap, i32 0, i32 0
%4 = load i8, i8* %3
ret void
}
transform/testdata/gc-globals.out.ll
Vendored
-31
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@@ -1,31 +0,0 @@
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown-wasm"
%runtime._string = type { i8*, i32 }
%runtime._interface = type { i32, i8* }
@globalInt = global i32 5
@constString = constant %runtime._string zeroinitializer
@constInterface = constant %runtime._interface zeroinitializer
@runtime.trackedGlobalsLength = internal global i32 4
@runtime.trackedGlobalsBitmap = external global [0 x i8]
@runtime.trackedGlobalsStart = internal global i32 ptrtoint ({ %runtime._string, %runtime._interface }* @tinygo.trackedGlobals to i32)
@tinygo.trackedGlobals = internal unnamed_addr global { %runtime._string, %runtime._interface } zeroinitializer
@runtime.trackedGlobalsBitmap.1 = internal global [1 x i8] c"\09"
define void @main() {
%1 = load i32, i32* @globalInt, align 4
%2 = load %runtime._string, %runtime._string* getelementptr inbounds ({ %runtime._string, %runtime._interface }, { %runtime._string, %runtime._interface }* @tinygo.trackedGlobals, i32 0, i32 0), align 4
%3 = load %runtime._interface, %runtime._interface* getelementptr inbounds ({ %runtime._string, %runtime._interface }, { %runtime._string, %runtime._interface }* @tinygo.trackedGlobals, i32 0, i32 1), align 4
%4 = load %runtime._string, %runtime._string* @constString, align 4
%5 = load %runtime._interface, %runtime._interface* @constInterface, align 4
ret void
}
define void @runtime.markGlobals() {
%1 = load i32, i32* @runtime.trackedGlobalsStart, align 4
%2 = load i32, i32* @runtime.trackedGlobalsLength, align 4
%3 = getelementptr inbounds [0 x i8], [0 x i8]* bitcast ([1 x i8]* @runtime.trackedGlobalsBitmap.1 to [0 x i8]*), i32 0, i32 0
%4 = load i8, i8* %3, align 1
ret void
}