feat: support fallback, remove loader impl

bytedance · Aug 12, 2024 · f4e48f1 · f4e48f1
1 parent e8f2ae7
commit f4e48f1
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Showing 25 changed files with 25 additions and 3,863 deletions.
diff --git a/loader/funcdata.go b/loader/funcdata.go
@@ -22,8 +22,6 @@ import (
     `fmt`
     `reflect`
     `strings`
-    `sync`
-    `unsafe`
 )
 
 const (
@@ -34,7 +32,6 @@ const (
 const (
     _N_FUNCDATA = 8
     _INVALID_FUNCDATA_OFFSET = ^uint32(0)
-    _FUNC_SIZE = unsafe.Sizeof(_func{})
 
     _MINFUNC = 16 // minimum size for a function
     _BUCKETSIZE    = 256 * _MINFUNC
@@ -69,14 +66,6 @@ const (
     ArgsSizeUnknown = -0x80000000
 )
 
-// moduledata used to cache the funcdata and findfuncbucket of one module
-var moduleCache = struct {
-    m map[*moduledata][]byte
-    sync.Mutex
-}{
-    m: make(map[*moduledata][]byte),
-}
-
 // Func contains information about a function.
 type Func struct {
     ID          uint8  // see runtime/symtab.go
@@ -174,39 +163,6 @@ func makeFuncnameTab(funcs []Func) (tab []byte, offs []int32) {
     return
 }
 
-// CU table format:
-//  cuOffsets[0] -> filetabOffset[0] filetabOffset[1] ... filetabOffset[len(CUs[0].fileNames)-1]
-//  cuOffsets[1] -> filetabOffset[len(CUs[0].fileNames)] ... filetabOffset[len(CUs[0].fileNames) + len(CUs[1].fileNames)-1]
-//  ...
-//
-// file name table format:
-//  filetabOffset[0] -> CUs[0].fileNames[0] \x00
-//  ...
-//  filetabOffset[len(CUs[0]-1)] -> CUs[0].fileNames[len(CUs[0].fileNames)-1] \x00
-//  ...
-//  filetabOffset[SUM(CUs,fileNames)-1] -> CUs[len(CU)-1].fileNames[len(CUs[len(CU)-1].fileNames)-1] \x00
-func makeFilenametab(cus []compilationUnit) (cutab []uint32, filetab []byte, cuOffsets []uint32) {
-    cuOffsets = make([]uint32, len(cus))
-    cuOffset := 0
-    fileOffset := 0
-
-    for i, cu := range cus {
-        cuOffsets[i] = uint32(cuOffset)
-
-        for _, name := range cu.fileNames {
-            cutab = append(cutab, uint32(fileOffset))
-
-            fileOffset += len(name) + 1
-            filetab = append(filetab, name...)
-            filetab = append(filetab, 0)
-        }
-
-        cuOffset += len(cu.fileNames)
-    }
-
-    return
-}
-
 func writeFuncdata(out *[]byte, funcs []Func) (fstart int, funcdataOffs [][]uint32) {
     fstart = len(*out)
     *out = append(*out, byte(0))